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    20 December 2006, Volume 28 Issue 6
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    地质勘探
    EVOLUTION OF DOMINANT OILGAS MIGRATION PATHWAYS OF ANSPORTING LAYER IN SOUTHERN MEMBER 2, THE NORTH OF WUERXUN DEPRESSION
    FU Guang MENG Qing-fen WANG Peng-yan
    2006, 28(6):  1-4.  DOI: 10.3863/j.issn.1000-2634.2006.06.001
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    According to the pattern characteristics of dominant oilgas migration pathways of transporting layer, the patterns of dominant oilgas migration pathways are divided into three types of coalescence, divergence and parallel patterns. Through the analysis of characteristics of transporting layer of southern member 2 in the north of Wuerxun depression, the oilgas migration pathways of southern member 2 transporting layer in the north of Wuerxun depression in each geological period are studied based on the reconstruction of ancient burial depth. The direction and distribution pattern of dominant oilgas migration pathways of transporting layer in the member has similar characteristics in different geological periods. There are five coalescence areas. The cealescance density of dominant oilgas migration pathways in well Su 1,Su 21 and Wu 8 is big, the cealescence area of well Su 21 is at the edge of hydrocarbon kitchen, the cealescence areas of well Su 1 and Wu 8 is in the hydrocarbon kitchen, which is favorable for oilgas to accumulate and form oilgas reservoirs. The cealescence density of oilgas migration pathways in the two cealescence areas of the west of this region is small, they are outside the hydrocarbon kitchen, which is not favorable for oilgas to accumulate and form oilgas reservoirs. The industrial oilgas wells now are either in the cealesence areas of oilgas migration pathways or on dominant oilgas migration pathways, which is the important condition for forming oilgas reservoirs.

    CRETACEOUS SEDIMENTARY FACIES AND THE EVOLUTION IN JIANGHAN BASIN
    LI Qun GUO Jian-hua ZENG Fang DUAN Hai-ting
    2006, 28(6):  5-8.  DOI: 10.3863/j.issn.1000-2634.2006.06.002
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    Based on comprehensive outcrop section measurement, drilling and analysis data, the Cretaceous sequence and its types of sedimentary facies and sedimentary characteristics in Jianghan Basin are systematically studied by using the theories of sequence stratigraphy, sedimentology and loggeology. It is shown that there are two tectonic sequences in Cretaceous affected by Himalayas curtainlike mountain formation movement, Cretaceous is mainly comprised by alluvial fans, braid river, braid river delta and exotic lake facies. In early Cretaceous, alluvial fans and braid rivers were only located in the front part of the fault in the basin because of weak depression and faulting; In late Cretaceous, the basin was totally depressed and faulted because of the aerial expansion, from its margin toward its center, the facies developed from alluvial fans, gradually to braid rivers and braid river deltas or exotic lake, forming a upfine sequence.
    JIA2 MENBER GAS RESERVOIR FORMING CONDITIONS AND THE MAIN CONTROLLING FACTORS IN THE CENTRALSOUTH SICHUAN TRANSITIONAL ZONE
    ZHAO Yong-gang CHEN Jing-shan LEI Bian-jun LI Yan-jun YANG Jin-li
    2006, 28(6):  9-12.  DOI: 10.3863/j.issn.1000-2634.2006.06.003
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    The gentle structure, poor developed faults and fractures and developed carbonate rocks and evaporate can be regarded as obvious characteristics of Jia2 Member in the study area. The Member basically belongs to restricted platform(semirestricted platform)evaporated platform facies except for fewer open platform facies. Bank subfacies, quasibank subfacies of inner carbonate platform, lagoon subfacies and tidalflat subfacies of restricted platform(semirestricted platform) influence formation and development of the reservoirs in Jia2 Member. Lagoon subfacies and tidalflat subfacies on evaporated platform and lagoon subfacies on restricted platform control distribution of cap rocks. Through the detailed analysis of hydrocarbon source conditions, reservoircap association, trap types, characteristics of gas migration and accumulation and gas preservation conditions, it is recognized that forming conditions have evident superiority and forming mediumscale gas reservoirs in Jia2 Member is potential in the zone. Proximal and vertical migration and accumulation of gas as well as perfect conditions of preservation become important guarantees for forming Jia2 gas reservoirs in the zone. The study shows that favourable subfacies, constructive diagenesis, anticline structure, hydrocarbon source fault and anhydrite rock layers are principally controlling factors of the gas reservoir forming. Distributing laws of hydrocarbon source fault and anhydrite rock layers provide important information for determination of gasoil accumulation horizons and favourable region of reservoir forming in the zone.
    THE DIVISION AND DISRTRIBUTION OF DIAGENETIC FACIES OF XUJIAHE FORMATION IN UPPER TRIASSIC，SOUTH SICHUAN
    ZHANG Zhuang ZENG Wei YANG Xi-yan
    2006, 28(6):  13-15.  DOI: 10.3863/j.issn.1000-2634.2006.06.004
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    The reservoir physical property of Xujiahe formation in south Sichuan is controlled by diagenesis. Research on its diagenetic facies can effectively forecast favorable reservoir area and provide reliable geological bases for exploration. The reservoir of Xujiahe formation is divided into five diagenetic facies according to the major diagenesis which control the formation and development of pore, they are the tightlycompacingt facies in shallow burial environment, the Calcium cementation facies in shallowmiddle burial environment, the Chlorite cementation facies in middle burial environment, the Silicon cementation facies in middledeep burial environment and the dissolutionKaolinite cementation facies in deep buried environment. The formation and distribution of these facies are strongly related to the original components of sediments. The reservoir property among these diagenetic facies has great difference, and the assemblage of different diagenetic facies can form dianenetic trap. Oil and gas exploration in the middle of South Sichuan(that is transitional belt of middlesouth Sichuan)should be not only in structural trap but also in diagenetic trap, because in these sections there are conditions to form diagenetic trap. 
    RESEARCH ON THE COMPACTION LAW OF THE WEST SICHUAN DEPRESSION
    LI Yang-bing MOU Zhong-hai XIE Yong-liang HE Hui
    2006, 28(6):  16-19.  DOI: 10.3863/j.issn.1000-2634.2006.06.005
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    On the basis of the acoustic well logging data from west Sichuan depression, the compaction curves of the sandstone and mudstone are depicted, and the relation between pressure coefficient and formation location in some wells are collected by the comprehensive analyses of these data, compaction law of the west Sichuan depression is summarized . It is revealed that there are four stages of compaction vertically, which are the fast compaction stage, the normal compaction stage, the transition compaction stage and the undercompaction stage. There is a trend gradually deepening to the up boundary of each compacted layer from north to south. The sand and mudstone of upper Triassic (T3) have the similar phenomenon of abnormal pressure. The distributing characteristic of oil and gas is different in different compaction stage. but natural gas mainly exists in the transition stage and the undercompaction stage.
    EFFECT OF SHOULDER BEDS ON RESISTIVITY LOGGING WHILE DRILLING AND ITS CORRECTION METHOD
    WU Bao-yu XIA Hong-quan ZHANG Zhi-yong
    2006, 28(6):  20-23.  DOI: 10.3863/j.issn.1000-2634.2006.06.006
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    Resistivity logging while drilling plays an important role in logging while drilling. Resistivity logging while drilling is affected by such environmental factors as borehole(hole diameter,mud) and shoulder beds (high resistivity or low resistivity shoulder beds), its logging value is always different from actual formation resistivity. The environmental factor correction of logging curves while drilling mainly uses chart correction method. The correction chart is made based on theory calculation or experiment result , it is not suitable for successive comprehensive environmental correction on all well segment formation. Schlumberger、Haliburton and Bakerhuges shoulder bed effect correction charts on resistivity logging while drilling made by the three companies are used to study on the relationship between resistivity logging values while drilling and shoulder bed resistivity, bed thickness and sampling and reading value on charts, and adopting neural network to match optimally, to gain correction formula, developing programs to realize automatic correction on shoulder bed effect in resistivity logging while drilling, all these show that ,the result gained with this method is rational, and the correction effect is evident.

    PRESENT SITUATION AND PROSPECT OF WIDEAZIMUTH 3D INSPECTION SYSTEM
    FENG Kai HE Guan-hui YIN Cheng TIAN Ji-dong ZHAO Wei-kun
    2006, 28(6):  24-28.  DOI: 10.3863/j.issn.1000-2634.2006.06.007
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    In view of some analyses and comparisons on parameters and attributes of several kind of common inspection system used in production practice at present, such as wideazimuth and narrowazimuth inspection system, multiline receive and repeat shot points wideazimuth inspection system, land water system area and shallowbeach transitional zone wideazimuth inspection system, the authors indicate the wideazimuth inspection system of the 3D seismic data acquisition is a technology which at present and even the certain time in future should be supposed to popularize massively. It is put forward that the most ideal target is the omnidirectional 3D seismic acquisition inspection system in which, the tracespacing, the receive linespacing and the shot pointspacing are completely regular and equal, and it is indicated the popularization of the ocean bed cable (OBC) technology, tenthousandtrace acquisition system in land and PC cluster technology will make the 3D seismic acquisition of the omnidirectional, the high density and the high cover inspection system possible.
    石油与天然气工程
    STUDY ON THRESHOLD PRESSURE GRADIENT IN ULTRALOW PERMEABILITY RESERVOIR
    HAO Fei CHENG Lin-song LI Chun-lan ZHOU Ti-rao YAO Yun-jie
    2006, 28(6):  29-32.  DOI: 10.3863/j.issn.1000-2634.2006.06.008
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    Aimed at the forming mechanism of the single phase and oilwater two phases threshold pressure gradient (TPG) and the influence on the law of flow through porous media, displacing experiment is done to the typical cores with ultralow permeability from block 119 at a certain oilfield with simulated oil, formation water and injected water respectively through the method of stable "pressure differenceflow capacity" measuring TPG, and the TPG value of single phase and oilwater two phases flow through porous media, the changing law of TPG is analyzed. Both physical simulation and theoriodical research indicate that the relationship between TPG measured with different media and permeability is power function, and the exponent sign is close to -1. Meanwhile, oil water two phases TPG is much greater than single phase one because of capillary force and Jiamin effect. Finally, the application of TPG in ultralow permeability reservoir exploitation is described.
    NUMERAL SIMULATION OF THREEDIMENSIONAL TERRESTRIAL STRESS FIELD CONSIDERING THE POURPLUCK RELATION
    WANG Bo-jun ZHANG Shi-cheng ZHANG Jin GAN Yun-yan
    2006, 28(6):  33-35.  DOI: 10.3863/j.issn.1000-2634.2006.06.009
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    The state of terrestrial stress changes because of the effects such as water injection and insitu combustion during the exploitation in the oil and natural gas fields, which influence the yield of oilgas relatively seriously. In this paper, based on the theory of liquidsolid coupling, the mathematical model of the terrestrial stress field is established which takes the pourpluck relations into consideration. The finite element model is developed in three dimensional stress field with the pore pressure changing by using the finite element method, the dyscalculia with the discrepancy between the stratum size and the mouth of a well size is solved by using the method of composite grid. The input is geologic and practical exploitative data, fluid pressure, saturation, solid distortion and the spatial distribution and the change with time of stress field are calculated through threedimensional stress field numerical simulation system. The result offers reliable basis for using appropriate measures to optimum development; meanwhile，it offers theoretical basis for exploitation adjustment, refracturing, forecasting the damage of casing etc. in anaphase.
    THE MECHANISM OF WATER FLOODING GAS CONDENSATE RESERVOIR
    WANG Zhou-hua TU YI Hong-jiang GUO Ping CHEN Yuan-zhong GAO Hui jun
    2006, 28(6):  36-39.  DOI: 10.3863/j.issn.1000-2634.2006.06.010
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    At present，the methods of developing the gas condensate reservoir are mainly depletion and gasinjection. Because of being restricted by lots of applied conditions, the use of gas injection is restricted; the depletion leads to lower recovery of condensate oil and the effectiveness of development is worse to gas reservoir with the high content of condensate oil. Water flooding is a new developmental method for gas condensate reservoir, the research on that is few, so it is worth probing. On the basis of the inhouse core flooding experiment of an abandoned condensate gas reservoir of Banqiao gas condensate reservoir by water flooding, the feasibility and mechanism of water flooding gas condensate reservoir are explored. The results of the experiment shows that the improved recovery of condensate oil and gas are 3.39% and 10.11%, respectively the effictiveness of water flooding at high speed is better than that at lower speed, the effictiveness of water flooding at lower pressure is better than that at higher pressure.

    A NEW METHOD OF COMPUTING THE BINOMIAL DELIVERABILITY COEFFICIENT OF GAS WELL
    PAN Zhao-cai YANG Guang-long SUN Hong-hai XIAO Yun FENG Peng-zhou
    2006, 28(6):  40-41.  DOI: 10.3863/j.issn.1000-2634.2006.06.011
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    The binomial deliverability equation is the ordinary method of calculating the gas well′s openflow capacity, the key is determining the coefficient. A gas well′s binomial deliverability equation is derived from a simple new method, no static formation pressure will be taken into consideration, based on the data of bottom hole flowing pressure and gas production rate only, as well as linear regression, the binomial deliverability equation can be established, meanwhile, the formation pressure can be determined, too. The result is accountable after practical calculation to the gas condensate reservoir at Yaha, Tarim basin.
    TRANSIENT WELL TESTING ANALYSIS CONSIDERING HEAT LOSS OF HEAVY OIL THERMAL RECOVERY IN DOUBLE POROSITY MEDIA
    CHEN Rong-can LIU Bin JIA Yong-lu YU Jia LI Long-yun
    2006, 28(6):  42-45.  DOI: 10.3863/j.issn.1000-2634.2006.06.012
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    The thermal recovery technology by Steam stimulation has become the most effective method in the heavy oil reservoir, but the steam upswept region would not be effectively improved, so the heavy oil reservoir can be divided into two areas according to the reservoir fluid properties. For the steam stimulation thermal recovery well in heavy oil reservoir with double porosity media, owing to the difference of flow properties in steam sweeping region and upswept region, the problem of well testing must use radial fluid composite model. The heat loss of steam in cap rocks is considered, a radial fluid composite model is established, in which, heat loss is considered, the solution of Laplace space in the condition of infinite formation is gained, and the method of numerical inversion is used to figure out the corresponding type curves, which provide a new model for pressure behavior analyses about heavy oil reservoir.
    THE APPLICATION OF NMR IN WELL COMPLETION BY PERFORATION
    ZHAO Min Qi Dun-su SUN Xin-bo CHEN Feng
    2006, 28(6):  46-48.  DOI: 10.3863/j.issn.1000-2634.2006.06.013
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    Acidizing and fracturing are performed on perforated Berea sandstone targets after perforating tests in labs. Nuclear magnetic resonance and industrial XCT tests are followed on the imperforated, perforated, acidized perforated and fractured perforated targets. Perforating damages on sandstone targets and the solution of this problem by acidizing and fracturing are quantitatively analyzed, the result was tested on site.
    THE DIFFICULTY AND COUNTERMEASURES OF DRILLING THICK GRAVEL BED IN WESTERN CHINA 
    GUO Ming-li
    2006, 28(6):  49-52.  DOI: 10.3863/j.issn.1000-2634.2006.06.014
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    The drilling operation is very difficult in shallowmid superthick gravel beds in western China, where the beds exist widely; accidents are frequent, which leads to long drilling cycle and the high cost. Aimed at the poor consolidation, loosen texture, easy collapse and sloughing, cationic gelbentonite drilling fluid should be chosen, and the ratio of dynamic shear force value to plastic viscosity should be≥1 . For the lower gravel formation which is better consolidated, highly mineralizedanti sloughing fluid system should be used to reduce the sloughing of the gravel beds. The research summarizes some successful experience and provides useful reference for the gravel beds drilling.
    STUDY AND APPLICATION OF BLENDING LIGHT OIL RECOVERY TECHNIQUE IN TAHE OILFIELD
    YANG Ya-dong YANG Zhao-zhong GAN Zhen-wei JIANG Hai ZENG Xia-mao
    2006, 28(6):  53-55.  DOI: 10.3863/j.issn.1000-2634.2006.06.015
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    Tahe OilField is main oilproducing field of Sinopec in Western China. The field is characterized by ultradeep, ultraviscous and other features. Aimed at ultradeep and viscous oil reservoir′s feature in the Tahe OilField, combining blending light dropping viscosity evaluation, utilizing polyphone pipe flow calculation, on the basis of the study of high viscosity oil characteristic and deep well lifting technique, deep well highviscosity oil blending light dropping viscosity optimum design model is analyzed, the application of blending light dropping viscosity in the Tahe OilField is evaluated. Field operation indicates that blending light dropping viscosity technique is a kind of main oil recovery one and stimulation for fitting Tahe OilField ultradeep level heavy oil.
    STABLE PRODUCTION THCHNOLOGY OF LOW PERMEABILITY AND COMPLEX FAULT BLOC RESERVOIES IN WENCHENG
    XIAO Li-ping
    2006, 28(6):  56-59.  DOI: 10.3863/j.issn.1000-2634.2006.06.016
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    Aimed at such problems in the low permeability and complex fault block oil reservoirs in WENCHENG oilfield as uneven interlayers water absorption, apparent interlayers disturbance, severe downhole accidence, low degree of completion of injection and production, inadequate liquid supply in oil wells and the poor basis of stable production, the area distribution of residual oil is determined by enhancing geological study and improving the recognition of reservoirs and structures, and measurement of enhancing oil recovery is introduced, the effectiveness of recovery gets considerably improved, output has been increased in the area for three years, the recovery rate speeds up, the ratio of cost and return is 1:1.67. The analyzing index of the developed reservoirs is put forward technically and economically, the useful data are accumulated for the stable production in the developed reservoirs. 
    THE ASPHALTENE DEPOSITION MECHANISM IN OIL RESERVOIR
    JIA Ying SUN Lei SUN Liang-tian WANG Sheng-hua ZHANG Yong
    2006, 28(6):  60-64.  DOI: 10.3863/j.issn.1000-2634.2006.06.017
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    Based on the investigation of comprehensive literatures about asphaltene deposition, the physical and chemical deposition mechanism of asphaltene and its plug to pore and throat are summarized. After being compared and analyzed, asphaltene deposition models can be classified as the ones based on phase splitting and colloid instability. Their limitedness and the cause are pointed out. It is indicated that it is necessary to analyze the temperature, pressure and components of asphaltene flocculation, to find out the main reason of asphaltene deposition and then clarify the influence of asphaltene on reservoir permeability, which can provide the basis of reservoir development plan, prevent formation damage and insure steady and high yield.
    THE OIL RECOVERY TECHOLOGY WITH SCREW PUMP IN THIN OIL AREA
    LIU Hai LI Gang-yao MA Zeng-hui FENG Xue-zhang ZHANG Xiao-hong
    2006, 28(6):  65-68.  DOI: 10.3863/j.issn.1000-2634.2006.06.018
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    Through the research on the structure and principle of screw pump, combining the oil well production condition, choosing the oil wells which are suitable for oil recovery technology with screw pump, oil recovery technology with screw pump is developed by using the specialized optimal software. The purpose is to satisfy the normal run of supply and discharge of oil well and lift system. Analysis of oil wells inflow performance and actual production conditions are introduced to determine the actual relations between supply and discharge of oil wells, and choose the range and specification of screw pump discharge capacity, then, carry on necessary optimal design of sucker rod, drive equipment and life system. Comparing with the field data of energy consumption between oil production of screw pump and oil production of pumping unit , it formulates that the oil production technique of screw pump have good characteristic of energysaving and costdecreasing, and It provides an important path to deep well midquality oil development. 
    Key words:
    油气化学工程与化工
    THE SCALING MECHANISM AND ANTISCALE MEASURES OF LULIANG OIL FIELD PRODUCTION SYSTEM
    LIANG Guang-chuan ZHENG Yun-ping ZHANG Jian-hua WANG Zhong-hua JIANG Wei
    2006, 28(6):  69-71.  DOI: 10.3863/j.issn.1000-2634.2006.06.019
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    In drilling operation, bottom hole assembly failures take place frequently, which occurs at the thread connection, where stress concentrates relatively. Study is aimed at box threads of ￠177.8 mm/drill collar to analyze and calculate drill collar box thread with different stressrelief grooves using finite element method, the stress concentration of thread end of 3 types of box threads is gained under same boundary condition and load. The calculation indicates the stressrelief grooves designed by the authors with better effect and best resistance of fatigue, so the grooves are recommended.
    DETERMINING THE ABILITY OF INSITU CO2 TO REDUCE OIL′S VISCOSITY BY THE METHOD OF RESISTANCE COEFFICIENT
    LIN Bo PU Wan-fen ZHAO Jin-zhou DIAO Su ZHOU Ming
    2006, 28(6):  72-73.  DOI: 10.3863/j.issn.1000-2634.2006.06.020
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    It is a new and effective technology to enhance oil recovery by using insitu CO2 to reduce oil viscosity. The authors research the method to determine the oil viscosity reduction by using insitu CO2, and bring forward the method of resistance coefficient. The evaluation is done to the single liquid system and dual liquids system of insitu CO2 ability of reducing oil viscosity in the sand pack. The results indicate that the single liquid system can reduce the oil viscosity by 42.15%, and the dualliquid system can reduce the oil viscosity by 52.69% when the oil viscosity is 12904.1mPa•s, the temperature 70℃, the pressure 6MPa. It shows the method of resistance coefficient to determine the degree of viscosity reduction is feasible and effective.
    THE WETTABILITY REVERSAL AGENT DISPLACING SIMULATION, BAIMA AREA OF XIFENG OIL FIELD
    ZHAO Ji LI Chun-lan WANG Wen-qing ZHAO Xiao-ling ZHAO Wei
    2006, 28(6):  74-77.  DOI: 10.3863/j.issn.1000-2634.2006.06.021
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    The Chang reservoir 8 in Baima area of Xifeng oilfield is the lowpermeability reservoir with average permeability of 0.77×10-3μm2, the wettability of reservoir rock is normally neutralpartial oil. For improving cruel oil recovery, the experiment of wettability reversal agent displacing in lab and numerical simulation were conducted on the basis of reservoir conditions. The optimal displacing plan that slug size is 0.1 times larger than pore space volume, and the slug combination is 1000mg/L(0.05PV)＋200mg/L(0.05PV). The oil recovery expected with wettability reversal model can be 36.75％,which increases by 9% compared to water injection production, the agent replacing oil ratio is 538ton/ton. The conclusion is that the development plan which the wettability reversal agent is injected to displacing oil in the low permeability reservoir should be reasonable.
    FIELD APPLICATION AND PRODUCTION BEHAVIOR OF CROSSLINKING POLYMER FLOODING TECHNOLOGY
    MA Yan CHEN Zu-hua LI Chao CUI Xiu-qing ZHOU You-sheng
    2006, 28(6):  78-80.  DOI: 10.3863/j.issn.1000-2634.2006.06.022
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    In Henan oilfield, polymer flooding technology is applied with high consuming amount of polymer， poor resistance to temperature and salt, weak profile modifiability and easy interaquifer flow, herein crosslinking polymer flooding technology is developed, and largescale pilot test is implemented in H2Ⅲ fault block unit of Xiaermen oilfield. Comparing the production performance of crosslinking polymer flooding with polymer flooding, the crosslinking polymer system shows better injectivity, higher injection pressure rise and better profile modifiability, weaker fluid productivity and larger producing fluid level drop than polymer flooding. Especially in the postwater flooding phase, the crosslinking polymer slug has effectively retarded the postwater breakthrough and retained good production behavior at lower water cut and oil production decline. Crosslinking polymer flooding technology plays a definite guidance role in field application of weak gel profile modifiability for other oilfield.

    THE PH VALUE OPTIMIZATION OF MODIFIED INJECTION WATER IN LINNAN OILFIELD
    WANG Ye-fei CONG Hong-liang WANG Dong-mei CAO Fang-qi YOU Qing
    2006, 28(6):  81-84.  DOI: 10.3863/j.issn.1000-2634.2006.06.023
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    Because of high salinity and weak acidity of the produced water in LinNan oilfield, the treated injection water brings about a series of problems, such as serious corrosion, scale formation and unqualified injection water. The technical mechanism of modification of the injection water and the relation between the water modification pH value and corrosion, sludge quantity and scaling are studied， the optimal pH value of the modified injection water is 8.20. After modified, the corrosive electric density of the water is 1/3 lower than that of original injection water, the sludge quantity is only 1/5 of that of the water which is not optimized, and the scaling decreases tremendously. Field application demonstrates the main index of the water quality reaches standard, scaling and corrosion of pipeline system and well bore lower, stimulation effectiveness of injection is getting better, and the startup pressure of injectors' decreases and the water absorption index increases, and a positive impact on development effectiveness is brought out.
    SELECTIVE WATERPLUGGING TECHNOLOGY WITH COMPLEXSLUG
    LI Zhen LI Ping SONG Yan-gao
    2006, 28(6):  85-87.  DOI: 10.3863/j.issn.1000-2634.2006.06.024
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    The water production of the oil wells is a common problem in exploitation, which makes serious influences on production of oil wells, gathering and transportation of gas and oil, and the exploitation of oil fields recovered by water injection. The water plugging agent composed of alteredcolophonypolymer (DM3) is chosen as the first slug and watershutoff experiments done on coarse porefracture cores. The result shows that this slug has good capability of temporary plugging and selective sealing on core. Dipping in diesel for 24 hours, the oil deplugging is greater than 82%, and the formation damage is less than 25%, as the time of deplugging gets longer, the deplugging is getting better and temporary plugging decreases. The basic formulation of thick particle cement has been determined through a series of experiments. The adjustments of the operation function have been finished. Field operation in Well Jin78 in Sichuan Jinhua is successful.

    石油机械工程及其它
    OPTIMAL DESIGN OF PACKER ELEMENT SYSTEMS WITH CONTACT FINITE ELEMENT
    WU Kai-song ZHU Tie-jun HOU Wan-yong ZHANG Yong XIE Bin
    2006, 28(6):  88-90.  DOI: 10.3863/j.issn.1000-2634.2006.06.025
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    In order to study the influence of geometrical parameters of packer element on its sealing function, ANSYS Parametric Design Language (APDL) is applied to program the contact finite element. By studying the relationship between geometrical parameters of packer element and its peak contact pressure and optimization of parametric variables, the results show that the total thickness of packer element has greater influence on its sealing function than the subthickness does. There is an optimum scheme for the height of packer element which influences the sealing function. The choice of contact angle between packer element and rings should be careful. Comparing to original plan, the optimum solutions shows that height and contact angle decrease 37.5%, 8.9% respectively, and peak contact pressure increases 13.38% by optimizing the height and contact angle.
    THE FINITE ANALISIS OF IMPROVED DRILL COLLAR BOX DESIGHN
    CHEN Yong LIAN Zhang-hua LIN Yuan-hua LI Rong CHEN Min
    2006, 28(6):  91-93.  DOI: 10.3863/j.issn.1000-2634.2006.06.026
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    In drilling operation, bottom hole assembly failures take place frequently, which occurs at the thread connection, where stress concentrates relatively. Study is aimed at box threads of Φ177.8mm drill collar to analyze and calculate drill collar box thread with different stressrelief grooves using finite element method, the stress concentration of thread end of 3 types of box threads is gained under same boundary condition and load. The calculation indicates the stressrelief grooves designed by the authors with better effect and best resistance of fatigue, so the grooves are recommended.
    A NEW METHOD TO IMPROVE THE EQUIPMENT FUNCTION OF OIL PIPE DETECTION OF MFL
    DU Zhi-ye RUAN Jiang-jun YU Shi-feng MA Bao-jun
    2006, 28(6):  94-97.  DOI: 10.3863/j.issn.1000-2634.2006.06.027
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    According to the actual parameters of detection equipment of MFL, the finite element emulator model is established. The shape and the parameters of the exciting coil are determined, and optimal signal/noise ratio gained. The thin iron plate acts as auxiliary magnetic path surrounding the Hall sensors and the coils, which eliminates the end effects. The Hall sensors are improved by setting iron plate on its twoside surfaces, which increases its abilities to test the axial direction component of the magnetic flux leakage signals. Emulation data is basically coincident with lab result. The research results have been used in developing new MFL testing equipment.
    PETROLEUM PRODUCTION FUNCTION AND ITS APPLICATION IN MAXIMUM PRODUCTION 
    LIU Zhi-bin JIA Min-hui KANG Xiao-jun
    2006, 28(6):  98-99.  DOI: 10.3863/j.issn.1000-2634.2006.06.028
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    The optimal allocation of oil production factor occupies a very important position in oil production, on the basis of studying oil resource and the production particularity, the difference between oil production and other industrial production is analyzed, and the features of oil production factors and importance of those factors are discussed in order from economic perspective, the author commends the functional simulation methods to set up the incidence relation of production factors and output after proceeding the qualitative investigation of oil output and production factors, and taking the incidence relation to be the oil production function is not only breaking the traditional production function mode but also building the petroleum production function adapting to its characteristic. Based on this production function, a maximum production model for petroleum is set up, dynamic programming is used to solve the mode and finally the optimal allocation of oil production factor obtained.
    CITY GAS LOAD PREDICTION BASED ON GREY THEORY
    SU Xin YUAN Zong-ming ZHANG Lin HUANG Lin XIE Ying
    2006, 28(6):  100-102.  DOI: 10.3863/j.issn.1000-2634.2006.06.029
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    City gas load is often closely related to such factors as city′s industry development and the population. However, the traditional city gas load GM(1,1) prediction model only has something to do with historical data, the prediction results can not truly reflect the changing tendency of gas load in the future. The Grey GM(1,N) model is used to establish the GM(1,3) model with three variables in one rank by bringing the two factors, industrial output value and population, into the gas load prediction model. The calculated results of actual examples indicate that this model can make accurate prediction of city gas load. Furthermore, the main factors that influence gas load have been taken into consideration in the model, which makes the prediction model and its results more reasonable.