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Table of Content

    20 August 2007, Volume 29 Issue 4
    专家论坛
    RECOGNITION AND CORRELATION OF TWO DISTINCT TYPES OF FAN DELTA FACIES
    CHEN Jing-shan TANG Qing-song DAI Zong-yang et al
    2007, 29(4):  1-6.  DOI: 10.3863/j.issn.1000-2634.2007.04.01
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    According to the research of tectonic setting, eustatic sea level change, depositional feature et al, two distinct types of marine fandelta facies in Yacheng Formation, Oligocene, Qiongdongnan Basin are identified. The fandelta facies, near mountains closely neighbor upon highland source area, are developed on the steeper slope at downthrow block of basinmargin fault. The sediments deposited in these fan deltas are frequently very coarse in the grain size and poor sorting. The pattern of grainsize probability plot mostly displays arcuate or oblique shapes. Graded and massive bedding resulted from gravity flow is common. These show that depositional hydrodynamics is dominated by the gravitycurrent action accompanied with tractional current action. The fandelta facies, near alluvial fan and characterized by being close neighboring upon subaerial alluvial fan, are usually developed on the relatively gentle slope at downthrow block of basinmargin fault. The sediments deposited in these fan deltas are commonly coarser in the grain size and good sorting. The pattern of grainsize probability graph is dominated by double segment and multisegment shapes. Crossbedding, parallel and ripple bedding resulted from tractional current is common, which shows that depositional hydrodynamics is dominated by the tractional current action accompanied with sediment gravity flow action. The reservoir performance of sand body is worse in fandelta facies near mountains than that in the fandelta facies near alluvial fan. It′s in favor of growing fandelta facies near mountains when there are steeper slope and higher sea level in the basin margin and when there are gentle slope at downthrow block and relatively low sea level, then, it is in favor of growing fandelta facies near alluvial fan. Along with the change of slope gradient and sealevel fluctuation in basin margin, these two kinds of fan delta may have the succession mutually.
    地质勘探
    THE HYDROCARBONEXPULSION CHARACTERS AND THE POTENTIAL RESOURCE EVALUATION OF THE 3RD MEMBER OF SHAHEJIE FORMATION IN DONGYING SUBDEPRESSION
    JIANG Fu-jie;PANG Xiongqi;JIANG Zhen-xue;et al.
    2007, 29(4):  7-11.  DOI: 10.3863/j.issn.1000-2634.2007.04.02
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    3rd member of Shahejie Formation is contestable as hydrocarbon source rocks, though it is the main formation in which the lenticular lithologic reservoirs develop. In this paper, based on the theory of hydrocarbonexpulsion threshold, the hydrocarbonexpulsion characters and the potential source evaluation of the upper, middle, lower sections within the 3rd member of Shahejie Formation are discussed. In the upper, middle and lower sections within the 3rd member of Shahejie Formation, there were the same main period of hydrocarbon expulsion and the hydrocarbonexpulsion threshold depth of 2500m, 2650m, 2600m respectively. The total hydrocarbonexpulsion and the total sources in the three sections are 58.41×108 t and 25.12×108t, in which the lower section holds more 77%, and the middle and the upper sections hold 16% and 7% respectively. The conclusions can be made depending on the comprehensive analyses that the lower section is the one of the main hydrocarbon source rocks and the middle section, due to its little contribution to the lithologic pools, is not the main hydrocarbon source rocks in Dongying subdepression.
    The Influnce of Relative Permeability Curves on Gas Condensate Well Performance
    JIANG Yu-le LI Cai-ming ZHANG Zhao-xia
    2007, 29(4):  12-15,5.  DOI: 10.3863/j.issn.1000-2634.2007.04.03
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    Due to terrain condition, plenty of observation and sampling are carried on by means of anomalistic and discrete measuring grid during geophysics exploration. For the sake of getting the more rational and correct geophysics anomaly interpretation, keeping the intrinsic field character, it is necessary to interpolate in the even and dense grid. a scattered interpolation with multilevel Bsplines which interpolates in the even and dense grid with scattered and sparse data is introduced in the article. This method establishes a set of grid layers of halfreducing reference point space, and optimizes multilevel scattered interpolation by estimating all scattered datum by means of Bsplines rectifying reference point grid layer. Threelevel Bsplines interpolation can guarantee both the high accuracy and the computing efficiency, which estimates well the even grid point value of two dimension or three dimension on account of the known discrete sparse value. This method is proceeded in academic model tests and the very ideal results obtained firstly. Then it is applied to two actual data processing about geophysical magnetic measure anomaly, good results obtained and the superiority verified. This method can be generalized in the whole geophysical data processing and interpretation.
    RESERVOIR TYPES OF CAMBRIAN AND ORDOVICIAN IN LESHANLONGNVSI PALEOUPLIFT AREA
    DAI Zong-yang XU Shi-qi YIN Hong et al
    2007, 29(4):  16-20.  DOI: 10.3863/j.issn.1000-2634.2007.04.04
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    The Cambrian and Ordovician are important exploration target strata in LeshanLongnvsi paleouplift area. Based on the rock core observation, thin section analysis, reservoir physical property analysis, logging and log data, the petrologic types, pore types and their configuration, distribution of porosity and permeability, reservoir types of Cambrian and Ordovician are studied in detail and discussed deeply. The results indicate: Dolomite rock is the major reservoir rock type in Cambrian and Ordovician, some limestone and sandstone occurs in the lower and middle Ordovician; various pore space types have been found, including pores, vugs and caverns and fractures, seven types of secondary dissolved pores are identified, they are intercrystal pore, intercrystal dissolved pore, interparticle dissolved pore, intraparticle dissolved pore, moldic pore and nonstructural fabric pore, the assembled patterns and distribution characteristics of the pores are different in each Formation or Member; The analysis of the combined patterns of pores, vugs and caverns, fractures proves that the vug and cavernfracture type, pore type, vug and cavern type and fracture vug and cavern type are four major reservoir types; The research results of porosity and permeability statistics also reveals that the main reservoir type of Cambrian and Ordovician is supperlow porosity and supperlow permeability reservoir, with middleporosity and lowerpermeability , lowerporosity and lowerpermeability reservoir interlayers.
    CAMBRIAN DEPOSITIONAL SYSTEM IN SOUTHWEST SICHUAN
    XIA Ji-wen;LI Ling LUO Bing et al.
    2007, 29(4):  21-25.  DOI: 10.3863/j.issn.1000-2634.2007.04.05
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    Cambrian strata wildly spread in southwest Sichuan and are composed of marine terrigenous clastic rocks and carbonate rocks. After analyzing the data of drilling, logging and well logging, as well as facies marks, it is suggested that terrigenous clastic depositional system was developed in Early Cambrian (Qiongzhusi Stage and Canglangpu Stage) and mainly includes terrigenous clastic shore and shallow shelf facies; carbonate platform depositional system was developed in late Cambrian and is mainly composed of carbonate tidal flat, mixing tidal flat, halfrestricted to restricted platform facies. Study on depositional characteristics and facies distribution shows that the material source of study area is from Kangdian old land, at that time the water depth progressively increase from northwest to southeast, and the distribution of depositional facies is orderly oriented in the direction from northwest to southwest.

    THE LAW OF SEDIMENTARY FACIES DEVELOPMENT OF ORDOVICIAN CARBONATE ROCKS IN THE LUNNAN′S PERIPHERY,TARIM BASIN
    MA Qing ZHAO Xue-qin CHEN Pei et al
    2007, 29(4):  26-29.  DOI: 10.3863/j.issn.1000-2634.2007.04.06
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    The Ordovician strata are well developed in the Lunnan′s periphery of Tarim Basin, and are mainly composed of marine carbonate rocks and terrigenous clastic rocks. The analysis of sedimentary facies indicates that Yingshan Formation, LowerMiddle Ordovician, is the deposits of bank and interbank sea subfacies in a territorial open platform facies. The shoal and patch reef subfacies in territorial seawater shallowing open platform facies were developed in Yijianfang Formation Middle Ordovician. The submerged platformslope facies were developed in Tumuxiuke Formation, Upper Ordovician. Lianglitage Formation, Upper Ordovician, is the deposits of carbonate platform edgeslope facies under the background of the Late Ordovician transgression. Two stage reef and shoal bodies are developed in the region, the first grew in the Yijianfang Formation, Middle Ordovician, the second at the top of Lianglitage Formation, Upper Ordovician. These reef and shoal bodies have distinct sedimentary environment and distributions. The Ordovician carbonate sedimentary facies are wholly distributed in the form of close northsouth each other. Every facies on the close eastwest direction has order to scatter, and obviously lateral migrate with time.
    OOLITIC LIMESTONE RESERVOIR CHARACTERISTICS AND ITS GENETIC MECHANISM OF JIA2 MEMBER IN MOXI GAS FIELD
    ZHOU Yan TAN Xiu-cheng LIU Hong et al
    2007, 29(4):  30-33.  DOI: 10.3863/j.issn.1000-2634.2007.04.07
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    Quantitative description of reservoir characteristics and its genetic mechanism analysis are prerequisite and foundation of reservoir distribution prediction, exploitation target selection and exploitation plan design. Starting from sedimentary lithology characteristics of the reservoir, the authors quantitatively analyze its basic properties including reservoir pore space type, microcosmic pore throat structure, physical property distribution and poroperm relation by taking nonlayered carbonate oolitic limestone reservoir of Jia22 A Bed, Moxi Gas Field in Middle Sichuan as an example. The genetic mechanism of oolitic bank reservoir is also studied, and its beach body migration model is established. The study indicates that the formation and distribution of the reservoir is under the associated control of the secondary differentiation of microtopography and transgressionregression cycle in the area. On local microtopography altitude, regression lasted for a long period, sediments were completely exposed, and eluviation of atmosphere freshwater on reservoir was therefore thoroughly conducted, leading to a comparatively thicker reservoir with better quality.
    THE CONDITION AND PATTERN OF RESERVOIR FORMATION AT LUXI AREA IN JUNGGAR BASIN
    HE Yan MU Zhong-hai TANG Yong
    2007, 29(4):  34-38.  DOI: 10.3863/j.issn.1000-2634.2007.04.08
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    The condition and pattern of reservoir formation at Luxi area are studied in this paper. On the basis of the study, it is pointed out that the condition of reservoir formation is favorate. The source rock is mainly the Fengcheng Formatiom of Mahu trough at Mabei and Madong Xiayan area, and the lower Wuerhe and Fengcheng Formatiom of West trough of Pen well 1 of Shixi and Shinan oil field in Luzhong area. The reservoir condition is good, and the reservoir condition in Xiayan area is better than that in Madong area. The main trap is unconformity and lithological trap. The trap formed in Permian period and the oil or gas migrated and accumulated in middle, last Triassic period, Jurassic period and Cretaceous period. The main transporting passage of oil and gas is faults and the permeabale layer and unconformity surface. The migration of oil and gas at top boundary unconformity of all strata of the Permian system and the Triassic system exists only on the slope in Luxi area. The migration of oil and gas at top boundary unconformity of Xishanyao Formation and Jurassic system exist mostly in the uplift of Luxi area. There are two kinds reservoir patterns including side of sourceunconformityslopezone type and outside source unconformityfault controlsteps type in Luxi area. Finally the favorable objects of reservoir in the strata related with unconformity include the slope area in Luxi area, the jointing area of Sangequan Oilfield and Shinan Oilfield, and the southern member of Sannan Depression in Junggar Basin.
    DEPOSITIONAL FRAMEWORK AND EVOLUTION OF BACHU FORMATION IN TARIM BASIN
    TAN Xiu-cheng CHANG Yan WANG Zhen-yu et al
    2007, 29(4):  39-43.  DOI: 10.3863/j.issn.1000-2634.2007.04.09
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    the analysis of depositional framework and evolution of Bachu Formation in Tarim Basin, the authors of the paper attempt to provide a new idea for a favorable sandbody and the prediction on assemblage of reservoir and cap beds. According to the principle of ubiquity of diachronism, it is recognized that the Donghe Sandstone Member and Low Mudstone Member of Bachu Formation are a diachronism lithostratigraphic unit of the total basin range and that bioclastic limestone can be considered as a precise time lithologic criteria. Taking the analysis of sedimentary tectonic background as the foundation, it is indicated that there are two Prototype basins in Tarim Basin, including cratonic margin depression and intracratonic depression. The depositional framework and development of Bachu Formation in Tarim Basin have been controlled by the ancient landform elevation caused by tectonic movement with high in the east and low in west, and progressive sea transgression from west to east. Combining with fine interpretation of sedimentary facies, Bachu Formation may be divided into four depositional evolution stages: initial sea transgression in primary stage, clastic shore and shelf development in early days, clastic shallow shelf development in medium time, carbonate platform deposition in an advanced stage.
    论文
    THE APPLICATION OF FAULT TREE ANALYSIS
    BU Quan-min;WANG Yong-tao WANG De-guan
    2007, 29(4):  41-144.  DOI: 10.3863/j.issn.1000-2634.2007.04.36
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    The Fault Tree Analysis (FTA), one of the common approaches to safety evaluation, is explored and discussed. Based on a theoretical analysis of the FTA, especially analytical thought and approaches, the main characteristics of the FTA are summed up. Taking the anhydride acetic acid produced by the methanol carbonylation method in Asia as the example, authors of the paper analyze the application of the FTA by designing relevant fault tree, successful tree, applying Boolean algebra and corresponding formula to calculate the structure importance coefficient of each basic event and arrange the order of the structure importance of each basic event. With this understanding, the scientific, appropriate and effective security control measures to realize the best control of product unit are put forward, the merits and shortcomings of the FTA and its application range pointed out.
    地质勘探
    DEVELOPMENT ENVIRONMENT AND FORMATION MECHANISM OF ALGAE LAMINAE IN LOWER CRETACEOUS IN JIUXI DEPRESSION
    GAO Bo;CHENG Ke-ming FAN Tai-liang et al
    2007, 29(4):  44-48.  DOI: 10.3863/j.issn.1000-2634.2007.04.10
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    The organic matter laminae composed of algae and its decomposition products is very abundant in argillaceous dolomite and dolomitic mudstone of the Lower Cretaceous in the Jiuxi Depression. The development of algae laminae greatly enhances the hydrocarbon generating ability of source rocks in the research area and is one of important reasons why the source rocks are heterogeneous. In this paper, development and reservation environment and formation mechanism of algae laminae in the Cretaceous source rocks are discussed, and the formation mechanism of algae laminae is probed. The research results show that in the early Cretaceous, the capaciousness of lake water, moderate temperature and salinity are favorite for the algae blooming. However, the strong reductive environment made by layering of lake water is greatly of advantage to reservation of organic matters. Seasonal change of lake water and its layering are the important reasons of the formation of algae laminae.

    CONTROL EFFECT OF THE PATHWAY SYSTEM ON HYDROCARBON DISTRIBUTION IN AKEKULE SALIENCE
    LV Shuang-bing;GAO Xian-zhi;HE Wan-jun et al
    2007, 29(4):  49-52.  DOI: 10.3863/j.issn.1000-2634.2007.04.11
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    Based on such features of Tarim Basin as miltiple oil sources, polycycle and multistage hydrocarbon generation, by means of the analyzing method of static association and dynamic evolution of the pathway system in the view of systematic and dynamic hydrocarbon reservoir formation, the pathway systems, according to the history of tectonic development and the process of the reservoir formation, are divided into the midlate Caledonian model which is a restrained horizontal direction network transportation system, HercynianIndoChines model which is an unrestrained network transportation system and YanshanHimalayan model which is a patially restrained horizontal direction network transportation system. The pathway system of the typical Lunnan, Lunxi and Tahe reservoirs are taken as cases to study, and the relation between the pathway system and the law of reservoir formation at Akekule salience, Tarim Basin is analyzed, the process of complicated hydrocarbon migration at the Salience, i,e., the law of oil and gas accumulation, is recognized, which provides a theoridic mode for exploring hydrocarbon areas.
    THE FLOW UNITS IN KESHANG FORMATION, LIUZHONG AREA, KARAMAYI OILFIELD
    SHEN Yong-wei XU Heng ZHANG Chun-Guang et al
    2007, 29(4):  53-55.  DOI: 10.3863/j.issn.1000-2634.2007.04.12
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    Keshang formation, Liuzhong area, Karamay oilfield is a fault block oil reservoir with serious heterogeneity in the sandstone and conglomerate reservoirs, aimed at the association characteristics and the layerdividing and correlation scheme of alluvial fanfan delta sandbodies in the area, as well as by applying pore geometry and flow zone index, the classification and evaluation of the flow units units in Keshang formation are carried out, and the difficulty of reservoir evaluation is solved. The flow unit characteristics in the area are distinctly different from the ones in alluvial facies and delta facies, in the research area, there are developed typeⅠ, Ⅱ, Ⅲ, Ⅳand Ⅴflow units, among them, there is a gradual change and splicing relation, the units occur in turn. The highgrade flow unit mainly exists in the middle part of the area, and the flow units in southwest and south parts of the area are relatively lowergraded. The research results of flow units can guide progressive exploration and exploitation.

    RESERVOIR HETEROGENEITY IN TOUTUNHE FORMATION,LU WELL 9,LULIANG OILFIELD
    LUO Ming-gao WANYAN Qi-qi SHI Guo-xin et al
    2007, 29(4):  56-60.  DOI: 10.3863/j.issn.1000-2634.2007.04.13
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    The lithology, diagenesis, pore types, pore structure and main controlling factors of the Toutunhe reservoir in Lu well 9 in Jurassic are investigated. It is indicated that the reservoir heterogeneity of the work area is obviously controlled by the sedimentary microfacies. The proportion of excellent and good reservoirs is very small. They are scattered and mainly distrubited in northeastern part. The lithologic character of Toutunhe reservoir has obvious rule in the section and overall displays a finingupward rhythm. The connection of reservoir sandbodies in the northsouth direction is better than that in the eastwest direction, and is dominated by the composite type.
    PREDICTION OF FRACTURES IN JIALINGJIANG FORMATION CARBONATE ROCK AT LUJIAOCHANGLIZIBA
    ZHU Shi-jun SUN Jian-ku LI Qi-rong et al
    2007, 29(4):  61-63.  DOI: 10.3863/j.issn.1000-2634.2007.04.14
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    The Jialingjiang formation of LujiaochangLiziba is a set of marine facies carbonate sediments, by analyzing geology, logging and cores, it isecognized the main types of reservoir pore spaces are porosity and fractureporosity. In the reservoir, the matrix porosity is small, and penetrability is low and fractures are the primary migration passage of gas and oil. Based on the anisotropy theory of seismic wave traveling, twodimensional fractal arithmetic is applied to predict the plane distribution of fractures in Tj22 and Tj21 .The result of prediction accords with logging and drilling interpretation. A good geological result is achieved. The plane distribution of fractures is a good reference for drilling in the future, and it has a guidable meaning to the exploration in the same area.

    石油与天然气工程
    A NEW METHOD AND THE APPLICATION ON CALCULATING STARTUP PRESSURE GRADIENT IN LOW PERMEABLE RESERVOIRS
    XU Jian-hong CHENG Lin-song QIAN Li-dan et al
    2007, 29(4):  64-66.  DOI: 10.3863/j.issn.1000-2634.2007.04.15
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    At the present, to the research flowing through porous media in most of low permeable reservoirs, the relation between permeability and startup pressure gradient is dained by core flooding experiment, which is timeconsuming and highly costed, and also, the factors taking into consideration are simple. Through the core flooding experiment, the core samples are from a certain low permeable reservoir in west China and with different permeability, processing and regression analysis of the data are carried on based on the mechanism of fluid flowing through low permeable porous media, a new physical model is set up, a new method studing startup pressure gradient is presented, and the mathematical model soluting startup pressure gradient of low permeable reservoir is gained. From the model, it can be derived that the main factors impacting startup pressure gradient are driving pressure gradient and the fluid mobility, there is a positive relation between startup pressure gradient and driving pressure gradient, and a negtive relation between startup pressure gradient and the mobility. By means of the mathematical model soluting startup pressure gradient and practice of low permeable reservoir, the influence of startup pressure gradient on single well productivity, ultimate distance between producer and injector and water content increasing rate are studied.
    WELL PATTERN OPTIMIZATION ADJUSTMENT FOR LOW PERMEABILITY OILFIELD
    CAO Ren-yi CHENG Lin-song XUE Yong-chao et al
    2007, 29(4):  67-69.  DOI: 10.3863/j.issn.1000-2634.2007.04.16
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    Aimed at the proplems exsiting in the process of the low permeabile reservoir production, the feasibility and the best adjustment moment of rhombus ninespot well pattern transformation and infilling are studied with a Changqing oilfield′s block with the ubiquitous problems in low permeability oilfield development. The results show: with rhombus ninespot well pattern transformed to cross row well pattern, development is obviously improved and the opportune moment is at the moment of water content 75%; With center infilling well converted after 2 years in rhombus ninespot well pattern, the oil production rate and recovery are improved; the best time for infilling to convert to injecting is after 2 years′ production. The optimal scheme for involved block is high oil remaining location infilled in 2007 and infilled well converted in 2009. The findings provide the technical reference for middle and later period adjustment of similar reservoirs.
    
    INFLUNCE OF GROUDWATER ENCROACHMENT ON OILWATER CONTACT IN SANJIANFANG RESERVOIR
    HAN Tao PENG Shi-mi MA Hong-lai
    2007, 29(4):  70-73.  DOI: 10.3863/j.issn.1000-2634.2007.04.17
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    After ten years′ development, the distribution of formation water in Shanshan oilfield becomes complicated. In recent years, it can be found that there is an obvious difference between the present oilwater contact and the past one by the drilling of new infilling wells in Sanjianfang reservoir; and in the whole, the oilwater contact takes on a new situation that is high in the north and low in the south, high in the west and low in the east. The research on distribution of oilwater contact, salinity, chemical composition and aqueous phase of the formation water indicates that from north to south the salinity becomes higher, the aqueous phase changes from NaHCO3 to CaCl2. Through the analysis of combination and content change of the different ions in formation water, combining with groundwater distribution characteristics of adjacent area, it can be concluded that a underground hydrodynamic pressure system results in the present oilwater contact distribution. It encroaches from the northwest and raises the oilwater contact in the west and the north area, also results in the change of salinity and chemical composition in formation water. This research sets up a solid foundation for the deployment of the new infilling wells and the study of water invasion for the reservoir in the future, at the same time, it provides a new idea for the explanation to the change of oilwater contact.

    INFLUNCE OF THE RELATIVE PERMEABILITY CURVE ON NUMERICAL WELL TEST CURVE OF OILWATERPHASE FLOW
    XIANG Zu-ping ZHANG Lie-hui CHEN Hui et al
    2007, 29(4):  74-78.  DOI: 10.3863/j.issn.1000-2634.2007.04.18
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    It is well known that the change of the rock relative permeability will effect on oil and water flow in the formation, therefore, the change will greatly effect on the shape of well test curve. In this paper, a numerical well test method is presented to study the influnce of different relative permeability curves on the well test curve, PEBI grid is used to discretize control equations of oilwaterphase flow in FEBI grid, which couples the wellbore storage and skin effect into account. The flow model for pressure drawdown well test is derived. According to comparing and analyzing the result calculated by numerical well test model pointing to different relative permeability curves, it is shown that the relative permeability of oil phase drawing down or building up will lead to the change scope and velocity of bottomhole pressure correspondingly increasing or reducing, consequently, well test curves will warp up or drop down.
    HE SENSITIVITIES OF THE INTERSALT LAYER NONESANDSTONE RESERVOIR AND EOR MECHANISMS
    HUI Jian LIU Jian-yi LIU Yao-wen et al
    2007, 29(4):  79-81.  DOI: 10.3863/j.issn.1000-2634.2007.04.19
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    Intersalt layer nonsandstone reservior in Qianjiang Depression of Jianghan Basin contains plentiful oil and gas resources, the characterisitics of the formations include the thin monolayer, mutilayer in vertical, huge total thickness of the formation and connected and wildly spreaded oil blocks. Oil tests show that the formation in the depression has EOR potential while most of the wells have a decreasing production rate. In order to use the inartificial resourses in an effective way, the production rate in an acceptable scale should be hold, also, the final recovery rate should be increased in effective ways. Based on the sensitivities analyze of the intersalt layer nonesandstone reservoir and core tests sampling from Wangping well block 1 and Wangbei well block 115, this paper presents the best exploitation way for special wells of this reservior.The rational way of exploitation in Wangping Well 1 District is waterflooding, and that the best way of exploitation in Wangbei Well 115 District is nitrogen injection.
    RESEARCH ON THE METHOD OF IMPROVING WATERFLOODING EFFECT FOR THE RESERVOIRS WITH PLANE HETEROGENEITY
    ZHOU Yong-yi WANG Yong TIAN Tong-hui et al
    2007, 29(4):  82-85.  DOI: 10.3863/j.issn.1000-2634.2007.04.20
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    If the reservoirs with plane heterogeneity are developed by using conventional fivespot well pattern with equalwellspace, the injected water preferentially fingers along the high permeability direction, which causes significant difference of water breakthrough times for production wells in different directions, and results in unbalanced displacement, consequently affects the effects of reservoir development seriously. The design formula for well space of vectorial well pattern for the reservoirs with plane heterogeneity is derived based on porous flow theory. According to the well space formula of vectorial well pattern, the physical models are made to carry out the contrastive water flooding experiment which is used to demonstrate the validity of vectorial well pattern. The results indicate that the vectorial well pattern can improve the plane sweep factor for the reservoirs with permeability heterogeneity, and raise the efficiency of injected water, moreover, it can improve the developing effect greatly. 
    THE TECHNOLOGY FOR STABILIZING PRODUCTION OF LOW PERMEABILITY AND COMPLEX FAULT BLOCK RESERVOIRS AT HIGH WATER CUT STAGE
    HU Shu-yong ZHANG Lie-hui FENG Yan et al
    2007, 29(4):  86-88.  DOI: 10.3863/j.issn.1000-2634.2007.04.21
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    Bai9 reservoir is low permeability and complex fault block reservoir, its structure is complex with high formation angle and difficult development. Aimed at the disadvantage factors that influence oilfield production, the new theories, the new technologies and the new methods are applied. The measures such as fracturing, acidizing, perforations adding etc. are applied successively in the reservoir. And old well worked over, old well plugged back, periodic water injection etc. are used at high water cut stage. The field practice makes it clear that the results are very good. The measures slow the rising velocity of water cut, increase exploitable reserve and improve oilfield exploitation results. The technologies may be applied in other low permeability and complex fault block reservoirs.
    THE DETERMINATION OF THE INJECTIONPRODUCTION WELL SPACING WITH THE CONSIDERATION OF THE STARTUP PRESSURE GRADIENT
    TANG Fu-ping TANG Hai YU Bei-bei et al
    2007, 29(4):  89-91.  DOI: 10.3863/j.issn.1000-2634.2007.04.22
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    It is one of the main research contents for the effective development of the low permeability reservoir how to determine the reasonable injectionproduction well spacing owing to the startup pressure gradient in the process of the flowing through porous media, According to the theory of flowing through porous media for the productionone sourceone convergence point, the calculation formula for the maximum startup pressure gradient in the midpoint of the channel line in the flooding unit is acquied. Integrating the relation between the startup pressure gradient and the permeability, the determination method of the reasonable injectionproduction well spacing for the low permeability reservoir is established and the theoretical plate for the reasonable injectionproduction well spacing on the condition of different permeability and injectionproduction pressure drawdown is obtained. The case application reveals that this method is simple and practical, the analytical results are basically identical with the actual situation in oil field.

    NUMERICAL SIMULATION RESEARCH ON UNDERGROUND GAS STORAGE CONSIDERING FRACTURE DEFORMATION
    FU Yu GUO Xiao DU Zhi-min et al
    2007, 29(4):  92-94.  DOI: 10.3863/j.issn.1000-2634.2007.04.23
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    The influence of rock deformation on reservoir porosity and permeability is taken into consideration in this paper. Based on WarrenRoot dualporosity model, the mathematical model of gas storage that accountes for fracture deformation′s influence is developed. A real case is calculated with the model. The result analysis shows that with the increase of the total operation time, gas storage pressure and gas injection well bottom hole pressure increases, porosity and permeability decrease. The gas storage pressure without deformation effect fluctuates in a certain range, and the bottomhole pressure of gas injection well without deformation effect basically remains the same. At the end of the 4th year within simulating time, gas storage pressure with deformation effect is 1.2MPa higher than that without deformation effect, gas injection well bottomhole pressure is 2.96MPa higher. While the porosity is 0.96 times of original value, and permeability is 0.87 times of original permeability, which indicates that the fracture deformation effect cannot be neglected in the study of depleted fractured reservoir underground gas storage. It is suggested that deformation effect should be take into account in field application and theoretical investigation of underground natural gas storage.
    A NEW OPTIMAL ALGORITHM FOR WELL TEST PARAMETER AUTOMATIC MATCHING
    ZHANG Jian-juna JIA Yong-lub
    2007, 29(4):  95-98.  DOI: 10.3863/j.issn.1000-2634.2007.04.24
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    In terms of the infinite homogeneity reservoirs, the automatic analysis of well test data and unique results are the goal of well testing. This paper proposes an algorithms of total optimization based on the method of the orthogonal experiment to estimate directly wellbore and reservoir parameters in single layered, boundless reservoirs from the possible bound of the unknown parameters. The algorithm does not depend on the initial guess of unkown reservoir parameters, such as permeability, accumulation factors and skin factors, and there is no need of the discussion of different analytic properties for model′s solution. The case given demonstrates the effectiveness of the algorithm. This paper focuses on the study of the well testing in an infinite homogeneous reservoir. It can be popularized to other well test analysis of reservoirs, such as natural fractured reservoirs and combined reservoirs. The method can be applied to estimate more unknown parameters of the reservoirs, such as boundary distance of the bounded reservoirs and crossflow factor of layered reservoirs.
    OPERATION PARAMETERS CALCULATION IN CEMENTING WITH FOAMED CEMENT
    ZHU Li-ping XU Feng YIN Hong-bin et al
    2007, 29(4):  99-101.  DOI: 10.3863/j.issn.1000-2634.2007.04.25
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    The circulation loss may occure usually in cementing in the formations of low pressure, leakage zones or fractured formation, so it will pollute the pay zones, reduce the penetration rate and increase the drilling cost. After analyzing many cementing practices, it is known that foamed cement is the Ultralightweight cement and has been used successfully as necessary technology of air drilling ay home and aboard. Because of the compressible gas in the foamed cement and gaseous phase parameters determined by the different pressure and temperature, it can′t use the conventional cementing theory to calculate. On the basis of the foamed cement physical model, the mathematical model using hydraulics and thermodynamics law is established. And the operation parameters calculation method suitable for foamed cement cementing is formed after analyzing the changing character of foamed cement density and pressure. The modeling concept and solving method are presented, meanwhile the case study shows the method is valid and viable in the actual cementing.
    A STEAM INJECTION MODEL FOR HORIZONTAL WELL IN HEAVY OIL RESERVOIR WITH THERMAL RECOVERY
    CHEN De-ming;ZHOU Jin-ying LI Zhi-ping et al
    2007, 29(4):  102-106.  DOI: 10.3863/j.issn.1000-2634.2007.04.26
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    It is thought that the steam diffuses uniformly into reservoirs in injection of horizontal well in heavy oil reservoir with thermal recovery, and the formula of MaxLangenheim is simply used to calculate the heating areas, but the study of the authors of the paper indicates that the steam diffused as some mathematical distribution, and the velocity of steam injection is in connection with reservoir parameters, the steam injection ability of formations and physical property parameters of steam, i.e, the injection pressure of steam has something to do with the injection fluid rate, there is a mathematical relationship between them. The authors study the steam injection ability, and set up a steam injection model for horizontal well in heavy oil with thermal recovery. The effect of heat exchange is consideres in the model, also the effect of steam intrinsic energy and friction loss. Then, a software (HHTS) is developed on the basis of this model, and the Leng 42 block of Liaohe oil field is calculated with the software, it can provide theoretical references for heavy oil with thermal recovery and horizontal well design parameters.
    THE INFLUENCE OF REASONABLE PRODUCTION ON PRESSURESENSITIVITY IN LOW PERMEABILITY GAS RESERVOIR
    DENG Jiang-ming ZHANG Mao-lin MEI Hai-yan et al
    2007, 29(4):  107-109.  DOI: 10.3863/j.issn.1000-2634.2007.04.27
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    A lot of researches indicate that the existence of stress sensibility appears frequently in the low permeability gas reservoir. The fluid pressure and effective stress will change in the course of production, and it will induce the productivity decreasing. In order to improve the equation of motion, the authors of the paper introduce permeability stress alternation factor to offer theoretical basis for numerical simulation. At the same time, the method of fixing peripheral pressure and decreasing fluid pressure is used to measure permeability stress changing factor, based on the results of the experiment, the numerical simulation software Eclipse is utilized to research SuX well in SuLiGe gas field, which will mainly simulate the change of production index considering and not considering the stress sensibility to analyze the influence of stress sensibility in the low permeability gas reservoir, finally the dynamic prediction of reasonable production is done to work out resonable production scheme, which provides a reference for the exploitation of low permeability gas reservoir under the condition of considering the character of pressuresensitivity.
    油气化学工程与化工
    APPLICATION OF HIGH TEMPREATURE HYDROCARBON DEGRADATION BACTERIA ON BIOCHEMICAL TREATMENT TO PRODUCED OILY WATER
    LIU Jun-qiang;BAO Mu-tai;WANG Hai-feng;et al
    2007, 29(4):  110-113.  DOI: 10.3863/j.issn.1000-2634.2007.04.28
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    In order to improve the biochemical treating effect of oilfield produced water, three bacteria strains, JQ-1, JQ-2, JQ-3, are isolated from produced fluids in Shengli oilfield, Which oil degrading rate are up to 48%, 55% and 46% respectively. Strains JQ-1, JQ-2 are identified as Bacillus sp, JQ-3 as Acinetobacter sp. Comparing with single bacterium, mixed three bacteria strains have better degradation ability, whose degrading rate of crude oil is up to 70%, the best degradation conditions of mixed bacteria are: temperature 45~55℃, pH6.5~7.0, mineralized rate 12000~18000mg/L. The bench scale laboratory biochemical test simulating field conditions show that after 8 hours, the oil content of oilfield produced water is reduced from 40mg/L average to less than 2mg/L, at the same time, sulfate reducing bacteria (SRB) is restrained effectively. Continuous biochemical treatment with hydrocarbon degradation bacteria is improved.
    THE PILOT TEST OF CATALYZINGOXIDATION DESULPHURIZATION TECHNIQUE OF THE STRAIGHTRUN DIESEL (I)
    TANG Xiao-dong;HE Bai CUI Ying-xian et al
    2007, 29(4):  114-117.  DOI: 10.3863/j.issn.1000-2634.2007.04.29
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    Aiming at the technical and economical problems in diesel hydrodesulphurization which includes high equipment investment and operation cost, and the problems in hydro peroxide oxidation desulphurization method such as expensive oxidant, low diesel yield and sulfur containing polluted water emission, a new catalytic oxidation desulphurization method of straightrun diesel is developed to conduct pilot test research. The pilot catalyticoxidation desulphurization facility of the straightrun diesel includes oxidation unit, recover unit of the TS2 oxidation catalysis, extraction and the EA1 extractant recover unit;the reactor is the static mixingreactor;under the most desirable conditions that the apparent residence time is 3~5 minutes, the reaction temperature is 60℃, the materiel circulation is 1000L/h, the proportion of the TS2 oxidation catalysis to the diesel is 0.24, the proportion of the diesel to the EA1 extractant is 2.5∶1, the sulfur in the turnoff diesel can drop from 2273μg/g to the 106μg/g. The sulfur content in the desulfurized diesel accords with the diesel criterion of EuropeⅡ(≤300μg/g), the desulphurization rate of the straightrun diesel reaches 95.34% and the refined diesel yield 97.23%.
    EXPERIMENT STUDY ON VISCOELASTICITY OF ASSOCIATIVE POLYMER SOLUTIONS
    CAO Bao-ge LUO Ping-ya ZHAO Yong-gang
    2007, 29(4):  118-121.  DOI: 10.3863/j.issn.1000-2634.2007.04.30
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    In order to study on viscoelasticity of associative polymer solution(APS) in actual reservoir, the viscoelasticity of APS has been studied when concentration and salinity vary in Daqing main reservoirs temperature and formation water salinity of oil field. The results show: the influence of concentration and salinity on the viscoelasticity of APS is the same as on HPAM solution; The viscoelasticity of HPAM solution is resulted from tangle between molecular chains, while the viscoelasticity of APS is mainly caused by the associating action between molecular chains, therefore APS shows obvious elasticity in lower concentration; In low and wide frequency scope, the elasticity of APS is larger than the one of HPAM solution obviously, which explains that APS will show obvious elasticity in lower shear velocity when APS flows in porous media, which signifies that the purpose may be achieved by using polymer solution′s elasticity to enhance displacement efficiency in not very high injecting rate.

    A PROBE OF PROFILE MODIFICATION DEPTH BEFORE POLYMER FLOODING IN UNDERPRODUCTIVE FORMATIONS, DAQING OIL FIELD
    FU Ya-guan QIAN Jie YUAN Guan-jun et al
    2007, 29(4):  122-124.  DOI: 10.3863/j.issn.1000-2634.2007.04.31
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    Through practice of lifting up polymer flooding target to underproductive performed in west of row 1 and 2, the developing area of central Sartu, Daqing oilfield, as well as profile modifying agent dosage calculation before polymer flooding and formula deduction, the applied profile modifying agent dosage and its economics calculation model are determined. On the basis of above practice, simulated calculations of the target formation profile modification depth and its economics are performed. After the comparison between the simulated result and the optimal profile modification depth obtained in the key productive formations, it is finally determined that, with a well spacing of 175 meters, and the given profile modifying agent of expandable particle crosslinker, the most effective profile modification depth in underproductive formations is 60 meters.

    论文
    THE EFFECT OF EXPERIMENTAL CONDITIONS ON RHEOLOGICAL PARAMETERS OF WAXY OIL
    TIAN Hua JING Jia-qiang JING Ling-ji et al
    2007, 29(4):  125-128.  DOI: 10.3863/j.issn.1000-2634.2007.04.32
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    It is very difficult to measure rheological parameters accurately because of the complicated components of waxy crude oils and the rheological parameters depending on the thermal history, shear history and other uncertain factors. The crude oil from Xinmiao, Daqing oilfield, is used as a sample. The effects of cooling and shear rate, test time and cooling rate on its static yield stress and rheological curve at low temperature respectively, the influence of heat treatment temperature, cooling methods and cooling rate on its viscositytemperature curve are all discussed by using the rheological test and analysis methods. The results indicate that the rheological parameters of a nonNewtonian waxy crude oil highly depend on the experimental conditions. Then a decision thinking that such experimental conditions as cooling rate, shear rate and test time should be decided by simulation calculation and reasonable design based on various test purposes is proposed, which provides a reference to the measurement of rheological parameters of other waxy oils.

    油气化学工程与化工
    EQUILIBRIUM SOLUBILITY AND KINETICS OF CO2 ABSORPTION IN AQUEOUS ACTIVATED METHYLDIETHANOLAMINE SOLUTIONS
    LI Gui-ming YANG Hong-jian JIA Qing et al
    2007, 29(4):  129-133.  DOI: 10.3863/j.issn.1000-2634.2007.04.33
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    The mechanism study on CO2 absorption in aqueous solution of TETA and MDEA has been conducted. The solubility and absorption rate of CO2 in MDEATETAH2O (2.7 mol MDEA/L + 0.3 mol TETA/L) are studied by using a dynamic absorption technique. A simplified gasliquid equilibrium model for the CO2TETAMDEAH2O system and the rate equation of CO2 absorption in the solution are developed. Predicted and experimental CO2 equilibrium solubility,CO2 equilibrium partial pressures and CO2 absorption rate are all in good agreement, and the relative error is less than 10%. The model and equation are reliable for commercial unit design.

    THE PREPARATION OF HEDP PHOSPHONATE POWDER USED IN SOLID SCALE INHIBITOR
    GE Ji-jiang LI De-sheng ZHANG Gui-cai
    2007, 29(4):  134-137.  DOI: 10.3863/j.issn.1000-2634.2007.04.34
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    The scaling in oil well can be effectively prevented for a longer time by using solid inhibitor. To select the inhibitor component used to produce solid inhibitor, 7 types of phosphonate scale inhibitors are evaluated, and HEDP is proved to be most effective and have a rather good properity of heatstability. From the solution of HEDP, HEDP powder can be obtained by the method proposed in the paper. One method is to neutralize the solution of HEDP with a certain concentration of NaOH, then desiccate and grind the resultant. The obtained phosphonate powder is easy to dissolve in water. Another method is to add Ca(OH)2 into the solution of HEDP with a ratio of n(Ca(OH)2)/n(HEDP)=1.75. After filtration, desiccation and grinding, another king of phosphonate powder, able to dissolve slowly in water, is gotten. The elemental analysis results confirm that the main constitute of the powder is Ca2HEDP. These two types of HEDP powder can be used to prepare solid scale inhibitor by mixing with polythene.

    石油机械工程及其它
    DYNAMIC CHARACTERISTICS OF THE COMPOUND ROCK BREAKING SYSTEM OF SINGLE TOOTHENCLOSE
    YANG Chun-lei LI Bin SHI Ge-meng
    2007, 29(4):  138-140.  DOI: 10.3863/j.issn.1000-2634.2007.04.35
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    The actual process of interaction between the tooth of roller cone bit and rock is complex. It is changing angle, oblique shocks rolling and blow it down into various compound movement. In which, the rock breaking system of single bit toothrow composite locomotion may simulate the motion, force and rock breaking state of tooth, and obtain the hole in all kinks of the bit structure, drill stress and rational velocity can be obtained, as to the important basis for appraising the bit preferences and researching the professional bit can be provided. It is important to appraise the rock breaking efficiency of bit and set up the simulation model that studies the theory, establish the bit toothlow compound movement rockbreaking system geometry relational models and dynamic simulation models. In the paper, with the ABAQUS finite element analysis sofeware, the analysis model is established, the rock by linear DruckerPrager model simulated, and the rock breaking system of single bit toothrow composite locomotion analyzed

    LARGE SIZE PRECISSION MEASURMENT DEVICE FOR PETROLEUM MACHINE
    ZHOU Xiu-yun;ZHOU Zhao-fei ZHANG Tao
    2007, 29(4):  145-148.  DOI: 10.3863/j.issn.1000-2634.2007.04.37
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    A largesize device precissily measuring spares and being able to be applied on site t is studied in the paper.The frequencystabilized HeNe laser with thermoregulation is used as the light source, which operates on the double longitudinal modes and has high frequency stability and good antidisturbance performance, the frequency stability is better than 10-7 (in open air) . It has the beat frequency about 790MHz and beat frequency wavelength λ=380μm which is benchmark of measurement. The node of the beatwave is used as sampling flag and the distance between the node and the close measuring point is measured with double frequency interferometer, the large size L is measured with the resolution of 0.08μm. The test indicates that the device has a high environment adaptability and highest frequency difference stability among the same kind of existing great size device.The measuring accuracy is better than ±30μm/10m and the measuring range is 0~20m. This results is important to resolve the ambivalent promble between environment and measure precision of large size in petroleum machine.
    PHOENICS SIMULATION FOR THE EFFECT OF SHUTDOWN TO CONTAMINATION IN BATCH TRANSPORTATION
    ZHAO Hui-jun;ZHANG Qing-song ZHANG Guo-zhong et al
    2007, 29(4):  149-151.  DOI: 10.3863/j.issn.1000-2634.2007.04.38
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    The new contamination model of batch transportation based on the k turbulent model is established. Numerical Simulation for the concentration distribution of contamination before and after shutdown to Batch Pipeline is conducted with the help of PHOENICS. The result is given by curves and pictures. The computation results shows that the effect of density to laminar bottom in erect pipeline is distinct and bigger than viscosity difference. The theory that oil with smaller density is at bottom of pipe, forming the length of contamination is not obvious and shorter than contrary direction at shutdown is also testified. The study has the theoretical guidance significance to reduce contamination at shutdown and track contamination interfacial and incise on breaking down and restart of pipeline.
    THE TOOTH OF GEOPHYSICAL HAMMER BIT NANOCOMPOSITE EXPERIMENTAL STUDY
    HUANG Zhi-qiang WEI Zhen-qiang LI Qin et al
    2007, 29(4):  152-154.  DOI: 10.3863/j.issn.1000-2634.2007.04.39
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    In view of the problem the present geophysical prospecting pneumatic hammer drill bit tooth is easy to appear wears and break in the work process. In this article ,a nanometer modified technology is used, by adding nanometer Al2O3 in the hard alloy to prepare a Al2O3/WC-Co nanometer/micron compound material and test its performance, organizational structure analysis, resistance to wear and bears experimental study are carried on, the result indicates that when 3% nanometerAl2O3 is added and the right amount of inhibitor is increased, the rareearth element can obviously improve the organizational structure of Al2O3/WC-Co nanometer/micron compound material, the property of YG8 is enhanced by 7~10 times, its overall performance is enhanced, which can greally improve the effevtiveness of rock breaking of bit, prolong the life length of bit, and the need of the petroleum physical prospecting to the well can be satisfied greatly.
    STUDY AND APPLICATION OF FRACTURING & PRODUCTION STRING WITH DOUBLE PACKERS IN DANIUDI GASFIELD
    ZENG Yu-chen XING Xi-chun CAO Ying-jie et al
    2007, 29(4):  155-157.  DOI: 10.3863/j.issn.1000-2634.2007.04.40
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    Daniudi Gas Field is a low porous, low permeable, low pressure and multizones gas field, single zone fracturing stimulation cannot meet the need of effective production so that a new method has to be used, i.e. fracturing two zones with double packers and putting the both zones into production without moving the string after stimulation. In consideration of the problems existing in separating zones fracturing string with hydraulic packer combination, a string system fitting to Daniudi Gas Field is developed which makes use of mechanical packers combination and puts the fractured zones into production after stimulation, thus the reliability of the fracturing string is enhanced. The prominent point about the combination is the use of double sliding sleeve sand injection valve, which makes the communication between upper zone and lower zone after fracturing treatment, therefore two zones can be produced together without tripping out of the string. From 2005 to 2006, 114 layers of 57 wells in Daniudi Gas Field were treated by using this string combination with a success rate of 97%, remarkable economical effect is achieved.
    GAS STORAGE STOREHOUSE RESERVES ESTIMATE
    LI Guo LIANG Guang-chuan YIN Ping et al
    2007, 29(4):  158-160.  DOI: 10.3863/j.issn.1000-2634.2007.04.41
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    The reserve in underground gas storage is one of the key factors enginners take into consideration in designing the gas storage. Guided by exsting gas reservoir theory, a new and suitable for general condition method is put forward aimed at the limitation of calculating dynamic reserve method, including materialbalance method, productivity decline method and unstable well test analitical method, first, from analyzing the lithologic stress of cover rocks in the gas storage, the breaking pressure of the rocks is calculated (i.e., the limit pressure when the storage contains gas), the maximum storing pressure of the storage is 0.7~0.8 times of limit pressure, so the maximum reserve and dynamic reserve of the storage can be determined, case study indicates the method is operable, a new idea is presented to determine the reserve of the storage.
    论文
    THE EXPERIMENT OF LEAKAGE MONITORING SYSTEM OF JING-XIAN OIL PIPE
    ZANG Guo-jun ZHANG Ming-yuan LUO Liu-shan et al
    2007, 29(4):  161-163.  DOI: 10.3863/j.issn.1000-2634.2007.04.42
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    The Jing′an-Xianyang pipeline is 463km long with 6 pump stations and monitored and managed with SCADA system. PIPELEAK3.1 software, which is written based on the priciple of negtive pressure wave by Beijing SinoCanadian Cheng-xin Pipeline Co, is used there for warning and monitoring pipe leaking. Valve stations in three pipe segments are choosed for leaking experiment to validate the applicability of PIPELEAK3.1 software at Jing′an-Wangyao section, Yangshan-Luochuan section and Yaoxianxianyang section. The experiment result shows that the system can have timely and accurate orientation and calculate the leaking amount when pipe is full of fluid. However, the actual condition is complicated because of the disbennifit caused by the full fluid condition and application distraction caused by oil stealing. Therefore, operators should make particular analysis based on actual condition and combine with other monitoring ways to put the system in good use.
    基础理论
    HYDROPHOBICALLY ASSOCIATING WATERSOLUBLE POLYMER WITH HIGHRATIO INTERMOLECULAR ASSOCIATION Ⅱ
    GUO Yong-jun FENG Ru-sen XUE Xin-sheng et al
    2007, 29(4):  164-166.  DOI: 10.3863/j.issn.1000-2634.2007.04.43
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    In order to achieve the objects of highratio intermolecular association molecular design, a new hydrophobically associating watersoluble polymers(HAWP) is designed by choosing hydrophobical content, spacer and chemical bond between main chain and its hydrophobic contents properly. A new nonionic hydrophobical monomer ANPE(Allyl(4Nonyl) Phenyl Ether)that meets highratio intermolecular association requirement is designed. The monomer ANPE is synthesized through phase transfer catalyzing process and a much lower virulence solvent which is acetone instead of benzene is used. IR and UV spectrum are used to characterize these two monomers. A nonionic hydrophobically associating copolymer(ANPEHAWP) with highratio intermolecular association composed of acrylamide (AM), crylic acid (AA) and a low amount of ANPE is prepared through micellar free radical copolymerization process. IR and UV spectrum are used to characterize the monomer ANPE and the terpolymer ANPEHAWP.

    博导论评
    INFLUENCE OF ROCK FRACTURES ON MECHANICAL STABILITY OF WELLWALL
    QIN Qi-rong DENG Hui
    2007, 29(4):  167-170.  DOI: 10.3863/j.issn.1000-2634.2007.04.44
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    Many factors can influence stability of well wall in the area of petroleum drilling engineering. Using 3D numeric analysis technology, authors of this paper simulates the influence of fractures on the stability of petroleum well wall. The result indicates that all kinds of fractures have negative influences on the mechanical stability of the walls, however, the degrees of the influence is different from each other correspondingly with the types, attitudes, densities, combination patterns and embedding depth of the fractures, and the general rules are follows: the influence degree of horizontal fractures is higher than inclined fractures, and inclined fractures is higher than perpendicular fractures, i.e., as the dip angle of the fractures increases, the degree of the influence on stability declines; as the number of fractures increases, the degree of the influence on stability declines; as the density of fractures increases, the degree of the influence on stability increases; as the embedding depth increases, the degree of the influence on stability declines.
    论文
    Cover Person Introduction
    2007, 29(4):  200-201.  DOI: 10.3863/j.issn.1000-2634.2007.04.100
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    Jia Chengzao, the CCP member, was born in Lanzhou, Gansu province, in 1948. He is the member of Academic Committee of State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation of Southwest Petroleum University. Graduated from Regional Geology and Mineral Survey of Geology Institute, Xinjiang Technical College, in 1975. He was studying in Geology Institute of Nanjing University from September in 1980 to February in 1987, and finally won the Master and Doctor degrees of Structural Geology and Geophysics. He was engaged in Geology Research on Tarim Basin from 1989 to 2000, was in EXXON Oil Company of America as a visiting scholar from 1996 to 1997, was geologist of PetroChina Company Limited and president of China National Petroleum Corporation from 2000 to 2004, was elected academician of Chinese Academy of Sciences. He is now the vice president of PetroChina Company Limited.
    Academician Jia Chengzao worked on oil and gas reservoir exploration and research in Tarim Basin for a long time, consummately carried on multi-disciplinary comprehensive research on oil and gas geology and structural geology of Tarim Basin, achieving series of significant development. He discovered and proved the biggest national high quality gas field Kela Gas Field 2 through his decision and organization, laying a resource foundation for West-East Gas Transmission and establishment of Tarim Gas Region, making important contribution to accelerated development of the national gas industry and the west development. He carried on multi-disciplinary multi-level and multi-direction comprehensive research on Tarim Basin, the biggest national basin: finding out the internal structure of the basin and conforming the basin style. He proposed the conception of Basin Group of Northern Tethys Tectonic Zone margin and their Rich Gas, pointing out that the basin group form Karakum basin in middle asia eastwardly to Tarim basin and Qaidam basin is a unified big gas region, which powerfully guided the exploration of depression gas in Kuche with the discovery of Kela Gas Field 2, and summarized and established the theory of ultra-high pressure gas field in foreland thrust belt for the first time in the world, making significant contribution on enriching the theory of oil and gas. In recent years, he devoted to research on petroleum exploration in China, proposed the Four-theories of onshore oil and gas exploration, including foreland thrust belt, lithologic stratigraphic oil and gas reservoir, the mature areas and the new areas, greatly developing and enriching the petroleum exploration of China, forcefully guided the onshore petroleum exploration of China in recent years, with large quantities of exploration achievement.

    本期导读
    Guidance for readers
    2007, 29(4):  201-202.  DOI: 10.3863/j.issn.1000-2634.2007.04.101
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    The research of carbonate rock of our university is supported by “Mineral Detailed Survey and Exploration” which is the key subject of Sichuan province, and relies on “Carbonate Rock Laboratory” which is approved to found by the previous Ministry of Petroleum Industry and “the Key Laboratory of Natural Gas Geology” of Sichuan universities. It aimed at carrying out scientific research on important basic theory and problems of application technology in carbonate rock areas in China. After nearly 50 years of construction and development, a series of research directions which were steady, and featured the theory, method, and technology of carbonate rock and natural gas exploration were established. The special report “Enhance the Superority of the Research on Carbonate Rocks, Contribute for Oil and Gas Exploration” introduced the research status in detail to readers from aspects of academic thought, research characteristics, main research directions and advantages, main research contents and achievement.
    “Recognition and Correlation of Two Distinct Types of Fan Delta Facies”, by Prof. Chen Jingshan and other authors, studied the steeper slope of basin-margin, eustatic sea level change, depositional hydrodynamic and depositional feature. Two distinct types of marine fan-delta facies in Yacheng Formation, Oligocene, Qiongdongnan Basin are identified, which are near alluvial fan and near mountains fan. It pointed out that it’s in favor of growing fan-delta facies near mountains when there are steeper slope and higher sea level in the basin margin and when there are gentle slope at downthrow block and relatively low sea level, then, it is in favor of growing fan-delta facies near alluvial fan.
    “The Hydrocarbon-Expulsion Characters and the Potential Resource Evaluation of the 3rd Member of Shahejie Farmation in Dongying Sub-Depression” was finished by Jiang Fujie and other authors. In this paper, based on the theory of hydrocarbon-expulsion threshold, the hydrocarbon-expulsion characters and the potential source evaluation of the upper, middle, lower sections within the 3rd member of Shahejie Formation are discussed using the hydrocarbon-generated potential method.
    At the present, to the research flowing through porous media in most of low permeable reservoirs, the relation between permeability and start-up pressure gradient is dained by core flooding experiment, which is time-consuming and highly cost, and also, the factors taking into consideration are simple. “A New Method and the Application on Calculating Start-up Pressure Gradient in Low Permeable Reservoirs” was written mainly by Xu Jianhong. Through the core flooding experiment, the core samples are from a certain low permeable reservoir in west China and with different permeability, processing and regression analysis of the data are carried on based on the mechanism of fluid flowing through low permeable porous media, a new physical model is set up, and a new method soluting start-up pressure gradient is gained.
    With the development of main oil fields in China, the water contained in produced liquid becomes more and its quality more complex. Since most of the produced sewage should be injected back to formation after being treated, oil waste water treatment urgent need solve. “Application of High Temperature Hydrocarbon Degradation Bacteria on Biochemical Treatment to Produced Oily Water” was finished mainly by Liu Junqiang. In order to improve the biochemical treating effect of oilfield produced water, three bacteria strains are isolated from produced fluids in Shengli oilfield to carry on biochemical treatment test under indoor locale simulation station. The result shows that the mixed bacteria improved the feasibility of oil water treatment to some extent, which provided theoretical basis to oilfield sewage treatment.
    The thesis “Dynamic Characteristics of the Compound Rock Breaking System of Single Tooth-Enclose”, mainly by Yang Chunlei, with finite element analysis software, established the single bit tooth-row compound movement rock-breaking system model. In the paper, the single bit tooth-row compound movement rock-breaking system is simulated using simulated rock, which is of important meaning in appraising the rock breaking efficiency of different drill styles.
    Many factors can influence stability of well wall in the area of petroleum drilling engineering. “Influence of Rock Fractures on Mechanical Stability of Well-Wall”, by Qin Qirong, using 3-D infinite element numeric analysis technology, simulates the influence of fractures on the stability of petroleum well wall, concluding influence degrees of stability of well wall correspondingly with the types, attitudes, densities, combination patterns and embedding depth of the fractures, which has the innovation.
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