Loading...

Table of Content

    01 December 2013, Volume 35 Issue 6
    Experimental Study on Shear Wave Reflection of a Borehole Dipole
    Source Excitation
    Wei Zhoutuo, Chen Xuelian
    2013, 35(6):  1-8.  DOI: 10.3863/j.issn.1674–5086.2013.06.001
    Asbtract ( 260 )   PDF (1541KB) ( 511 )  
    References | Related Articles | Metrics

    Through related experimental studies on dipole shear wave remote detection measurement-mode,we study shear
    wave reflection of a borehole dipole source excitation from near-borehole formation interface,and measure full waveform inside
    and outside borehole under different source positions,different polarization directions and different formation interface
    characteristics. The experimental results show that a dipole source in a fluid-filled borehole excites direct flexural wave propagating
    along borehole and outside borehole,but also radiates two types of shear wave,which are SH-wave and SV-wave,
    respectively. Along with the dipole polarization direction from 0° to 90°,reflected shear wave amplitude gradually decreases,
    and verified that the dipole source for near-borehole reflector has obvious azimuthal directivity characteristics,which can be
    used for determining near-borehole geological structure strike. Under the solid-liquid or solid-gas formation interface characteristic,
    total reflection of SH-wave at the reflector interface will happen,and mode conversion occurs to SV wave,so SH-wave
    reflection helps to remote detection imaging,and has unique advantages for fractures.

    Theory and Application of Seismic Palaeokarst
    Li Zongjie1,2, Liu Qun2, Li Haiying2, Deng Guangxiao2, Peng Jun3
    2013, 35(6):  9-19.  DOI: 10.3863/j.issn.1674–5086.2013.06.002
    Asbtract ( 303 )   PDF (1262KB) ( 555 )  
    References | Related Articles | Metrics

    For the carbonate ancient karst cave reservoir prediction problems of the strong heterogeneity in the vertical and
    horizontal direction,we carried out the three-dimensional seismic reservoir prediction technology research under the guidance
    of ancient karst geology theory. We put forward the concept of seismic palaeokarst science and expounded the basic viewpoints,
    research contents,technical route,development trends,and research significance. Seismic Palaeokarst study is a set of
    knowledge system,which is based on the high-precision three-dimensional seismic techniques. Through the seismic forward
    modeling and well seismic calibration,the seismic identification model of ancient karst cave is established,and the favorable
    zones of the palaeokarst caves reservoir is predicted,and favorable exploration targets are selected optimally. It has an important
    guiding role to the exploration of palaeokarst carbonate fractured-vuggy reservoirs. Taking the carbonate fractured-vuggy
    reservoirs in Tahe oilfield as an example,the application and effects of seismic Palaeokarst is proved.

    The Character of Tectonic Evolution of Jialingjiang Strata Section 2 in
    Huanglongchang Area in Northeast of Sichuan Basin
    Zhou Lu1, Zhang Feijie1,2, Li Fei3, Li Xianyan4, Ni Hualing1,2
    2013, 35(6):  20-30.  DOI: 10.3863/j.issn.1674–5086.2013.06.003
    Asbtract ( 193 )   PDF (9538KB) ( 400 )  
    References | Related Articles | Metrics

    Huanglongchang structure is located at the cross point of in Dabashan fold belt and east arc fold belt of the Sichuan
    Basin,which is complex in the structure and the tectonic movement. There are two types of fold belt systems in the deep and
    shallow underground. Through the analysis of seismic slice and horizontal slice,the type of the fracture and its distribution
    feature were recognized,and the corresponding texture style was estblished. Some forward modeling on these structures have
    been done to verify the rationality of them. Based on the study,we analyse the tectonic movement and its characteristics,
    and determined the time of the tectonic development and structure evolution feature of Huanglongchang. the development of
    structures in Huanglongchang is classified four stages:Early Indosinian low uplift period,the late Indosinian great thrust fold
    development period,Yanshan epoch small extrusion fracture development period,and the Himalayan inherited uplift period.

    Petroleum Accumulation Field in the Deep Strata of the Eastern Slope Area
    of the Mahu Sag,Junggar Basin
    Chen Gangqiang1, Ablimit1, Bai Lei2, Zhang Jiahao1, Bian Baoli1
    2013, 35(6):  31-38.  DOI: 10.3863/j.issn.1674–5086.2013.06.004
    Asbtract ( 251 )   PDF (845KB) ( 540 )  
    References | Related Articles | Metrics

    In order to deepen the hydrocarbon exploration in the slope area of the Mahu Sag,northwestern Junggar Basin,
    and to provide a reference for studies with similar geological settings worldwide,we investigated the field of hydrocarbon
    accumulation and exploration in the deep strata of the eastern slope area. This was conducted based on analyzing accumulation
    features and conditions. Results show that the deep strata surrounding the Permian-Triassic unconformity is a key target of
    exploration in the studied area. In the target Permian and Triassic reservoirs,the oil is light in nature and they have good
    preserving conditions,favorable facies and relatively good-quality reservoir. Thus,high production may be likely,especially
    in the sub-facies of fan delta front. Combined with analyses of sedimentary and seismic facies and an integration/comparison
    of wells and seismic data,we investigated the spatial distribution of favorable facies and the dominant trap types. Results show
    that the favorable exploration area is large and the lithologic and stratigraphic trap is widely developed. Considering the low
    exploration level currently,the exploration prospect is wide and large. This likely provides a new exploration field and,thus,
    deserves to be strengthened in the future exploration.

    Influences of Clay Minerals on Physical Properties of Low
    Permeability and Tight Sandstones
    Jiang Yuqiang1, Zhang Chun2, Deng Haibo3, Wang Meng1, Luo Mingsheng4
    2013, 35(6):  39-47.  DOI: 10.3863/j.issn.1674–5086.2013.06.005
    Asbtract ( 217 )   PDF (1236KB) ( 545 )  
    References | Related Articles | Metrics

    The clay mineral is the most important interstitial material of clastic reservoir,and is widely distributed in the Xujiahe
    Formation,which plays a major impact on sandstone reservoir. Taking the typical blocks of Yingshan structure as the research
    object,with the casting thin sections,scanning electron microscopy,X–ray diffraction and electron probe experiments,we carried
    out an in-depth research on the type,the occurrence and nature of its formation mechanism of clay minerals in sandstones,
    and made systematic analysis of clay minerals on reservoir development. The research show:(1)The clay minerals include
    mainly illite and then chlorite,with rare mixed-layer illite/smectite and kaolinite flakes pages.(2)Authigenic chlorite is mainly
    formed by the precipitation of newborn,with four major possible sources of iron.(3)Authigenic chlorite major growth period
    may be in the early diagenetic stage before in diagenesis,and generally continue to grow in the late stage.(4)Authigenic chlorite
    and illite formation has a dual role in reservoir development,the protective effect of chlorite and illite on primary intergranular
    porosity must be formed in the early diagenesis,with certain thickness and quantity. Illite and mixed-layer illite/smectite filling
    the intergranular play a blocking effect on reservoir.

    Tight Sandstone Reservoir“Sweet Spot”Prediction of Badaowan
    Formation in Baka Region
    Wu Yong1, Kang Yili1, Ji Weihua2, Liu Shiwen3, Sheng Rong4
    2013, 35(6):  48-56.  DOI: 10.3863/j.issn.1674–5086.2013.06.006
    Asbtract ( 205 )   PDF (1339KB) ( 504 )  
    References | Related Articles | Metrics

    According to the reservoir microscopic geostatistical analysis,the results show that the granularity of sandstone is in
    relatively good correlation with reservoir porosity and permeability in Baka Region. By building log interpretation model and
    with gamma curve,we get the parameters of granularity of sandstone and reservoir feater. Based on the geological reservoir
    microscopic parameter statistical analysis and logging model calculation results,and with the reservoir microscopic geological
    statistical parameter inversion and coherence analysis technology,we made prediction of tight sandstone reservoir sweet spot
    distribution of Badaowan Formation. The sweet spot of tight sandstone reservoir in Badaowan Fortamtion are mainly distributed
    in high faulted anticline of Kekeya tectonic belt and adjacent to the slope area. The tight sandstone reservoir of Badaowan is of
    granularity coarser,and relatively high permeability;within a certain range,the porosity is relatively high,which is favorable
    reservoir distribution area and favorable exploration area for tight sandstone gas reservoir in Baka Region.

    Fracture Prediction in Tight Sandstone Reservoir with Curvature Method
    Li Zhijun1,2, Zhang Ying1,2, Dou Yu3, Li Xiaogang1,2
    2013, 35(6):  57-63.  DOI: 10.3863/j.issn.1674–5086.2013.06.007
    Asbtract ( 202 )   PDF (685KB) ( 537 )  
    References | Related Articles | Metrics

    In view of the tight sand fractures with its relatively strong heterogeneity and the problem difficult to prediction,the
    distribution prediction of natural fractures in tight and low permeability sandstone was discussed. In this paper,taking the S32
    reservoir as an example in the ZZ Oilfield,the curvature method was used to predict fracture distribution law for target strata
    by means of establishing 4 different curvature models,using 4 different calculating methods including spline function,trend
    surface fitting,three-point circular arc,and calculus of differences,respectively. The calculation results by the 4 methods have
    good positive correlations with open flow capacity in gas well testing in this study area,indicating that curvature method can
    be used to predict the subsurface fracture distribution range. Among them,spline function shows the best prediction results.
    therefore,the spline function curvature method has good application prospects in our study area.

    Analysis of the Prediction Effectiveness About Baiyinchagan
    Depression Gentle Slope Belt Reservoir
    Wang Hui1, Zhang Yamin2, Zhang Wenbo2, Dong Ligang2, Chen Faliang3
    2013, 35(6):  64-70.  DOI: 10.3863/j.issn.1674–5086.2013.06.008
    Asbtract ( 269 )   PDF (865KB) ( 511 )  
    References | Related Articles | Metrics

    In view of the distribution problem of sand body in Baiyinchagan Depression gentle slope belt about Tengger group
    thin interbed oil sands level,we carry out the research with the methods of geological and geophysical relations,seismic multiattribute
    analysis and wave impedance inversion. It is the results indicate in this paper that(1)The sandstone impedance
    characteristics of the thin interbed level is not clear and the single reservoir prediction method could not conduct reservoir
    prediction effectively.(2)The sand body has good reflection in seismic multi-attribute analysis.(3)Seismic muliti-attribute
    prediction can finely describe the lateral changes of the thickness of sand shale and the prediction effectiveness is consistent
    with the real drilling data. Recently,based on the depression belt prediction target,we successfully drilled the tin Well X27,
    and found out the rich block and controlled the geological reserves in ten million tons. The realization of efficient exploration
    provides a good direction for the exploration and development of the oilfield.

    Logging Recognition of volcanic Edifices of Faulted Sequence
    in Songliao Basin
    Zhang Jianrong, Li Lin
    2013, 35(6):  71-77.  DOI: 10.3863/j.issn.1674–5086.2013.06.009
    Asbtract ( 177 )   PDF (928KB) ( 498 )  
    References | Related Articles | Metrics

    Based on the rock texture,volcanic edifices of Yingcheng Formation and Huoshiling Formation in Songliao Basin
    were classified into 3 types. They were pyroclastic volcanic edifice,lava volcanic edifice and compound volcanic edifice.
    According to the chemical composition of rocks,every type was classified into acid subtype or intermediate-basic subtype.
    Based on the number of cones the volcanic edifices were classified into 16 basic types. Most volcanic edifices of Huoshiling
    Formation are intermediate and basic lava’s. And most of volcanic edifices of Yingcheng Formation are acid compounds. On the
    basis of 544 samples of acid volcanic edifices,the lava’s average of porosity and permeability was bigger,and the pyroclastic’s
    was smallest. The discovered gas pool of volcanic rocks revealed that productivity of acid volcanic edifices were higher than
    intermediate and basic’s. The gamma average value of intermediate and basic edifices is less than 80 API,and that of the
    acid edifices is more than 110 API. More than 70% of the lengths of lava edifices loggings are low amplitude-box shape with
    smooth-microjagged. More than 70% of the length of pyroclastic edifice loggings are middle-high amplitude box or bell shape
    with jagged-microjagged. The other part is compound volcanic edifice. According to logging response of volcanic edifices,
    the logging recognition model of texture is built with variance,variation root,stair slope,down slop,relative difference value
    between stair slop and down slop. The component of volcani

    Research on Interpretation Method with the Production Profile of
    Condense Gas Well in Tarim Oilfield
    Chen Wenlong1,2, Zhao Jun1, L¨U Bo2, Lei Zhenyu3
    2013, 35(6):  78-82.  DOI: 10.3863/j.issn.1674–5086.2013.06.010
    Asbtract ( 189 )   PDF (483KB) ( 451 )  
    References | Related Articles | Metrics

    In recent years,13 high-pressure condense gas fields have been explored within Tarim Basin,such as the Yaha,
    Jilake,Yingmaili,Dina,and so on. In the actual production,the condense gas will produce condense oil and then form the
    two-phase of oil and gas,with the decrease of temperature and pressure. The transformation of this phase state will lead to the
    difference between the explanation of production profile of the condense gas well and that of ordinary oil & gas well. According
    to the specific features of condense gas reservoir in Yaha and Yingmaili,we use the production log data with 8 parameters to
    calculate the output of the single layer of the condense gas well by using the method of PVT state diagram and the model of
    oil/gas-phase flow,on the basis of analyzing the characteristics of log response. The application shows that

    Study on Water Flooding Production of Typical Low Permeability
    Reservoir Feature
    Yang Zhengming1, Bian Chenxu2, Liu Xiangui1, Wang Xuewu1
    2013, 35(6):  83-89.  DOI: 10.3863/j.issn.1674–5086.2013.06.011
    Asbtract ( 198 )   PDF (629KB) ( 495 )  
    References | Related Articles | Metrics

    Low permeability reserves occupied a very large proportion in our country’s proved and undeveloped reserves.
    So it is urgent to research the micro pore structure characteristics of low permeability reserves. Based on a large amount of
    experimental data by using constant-rate mercury penetration and nuclear magnetic resonance,the relationship between the
    mainstream throat radius,the percentage of mobile fluid and the permeability of different oilfields were analyzed,and the cores
    throat distribution and NMR T2 distribution with various permeability of different oilfields were studied. The results show
    that there were differences in the throat distribution and NMR T2 distribution of cores from different oilfields with various
    permeability,and the proportion of 1.0µm throat and the relationship of T2 left peak and right peak can be the evaluation limit
    of water flooding producing. The lower permeability limit of water flooding development in Changqing Oilfield and Daqing
    Oilfield were studied,which laid a solid foundation for the development of low permeability reserves.

    Experience of Efficient Fracturing of Shale Gas in North America and
    Enlightenment to China
    Zeng Fanhui, Guo Jianchun, Liu Heng, Xiao Yong
    2013, 35(6):  90-98.  DOI: 10.3863/j.issn.1674–5086.2013.06.012
    Asbtract ( 261 )   PDF (455KB) ( 1002 )  
    References | Related Articles | Metrics

    Shale gas as an important unconventional resource,is essential for our energy security and supply,but the shale
    reservoir is of low porosity and extra-low permeability characteristics,and hydraulic fracturing is needed to obtain the desired
    economic output. We summarized the advanced technology used in American shale gas exploitation in the paper. Based on
    the shale gas reservoir characteristics and technology development of China,we also discussed the directions of large-scale
    development of shale gas in China. The results indicate that economical development of north American shale gas benefited
    from the advanced reservoir evaluation,horizontal drilling and hydraulic fracturing. And we also further evaluated the latest
    developments in north American shale gas,including reservoir evaluation,fracturing material and design optimization,production
    evaluation. In addition,discussion of technology adaptability and basic principles of various technologies are presented.
    In order to improve the development of shale gas in China,from exploration to development,we should learn from combining
    advanced experience with our reservoir features to carry out science and technology research,such as whole optimization of
    exploration and development,the volume fracturing mechanism and related technology,the evaluation of negative effects of
    shale gas development.

    Study on the Mechanism of Horizontal Well Development Based on NMR
    Liu Fan1, Jiang Hanqiao1, Zhang Xiansong2, Li Junjian1
    2013, 35(6):  99-103.  DOI: 10.3863/j.issn.1674–5086.2013.06.013
    Asbtract ( 168 )   PDF (706KB) ( 449 )  
    References | Related Articles | Metrics

    Based on the three-dimension physical model experiment to simulate water flooding and the nuclear magnetic
    resonance imaging(MRI)as well as the T2 spectrum measuring techniquein this paper,we establish a series of laboratory
    experiment methods to study the pore scale producing mechanism of horizontal well development in the high water cut stage.
    With the experiment methods,the residual oil distribution and different pore scale producing mechanism of horizontal well
    development for Ng5–6 strata is further studied. The results show that the relative oil saturation in small pores varies with the
    degree of displacement,but the relative oil saturation in middle-large pores is almost the same. During the whole displacement
    progress,middle-large pores act most actively. Until the relative oil saturation of reservoir reduces to an extent,the oil in small
    pores begins to be produced. The producing extent of small pores is even larger than the middle and large pores when the relative
    oil saturation of reservoir reduces to an extent because of imbibition effect. The horizontal well is an effective way to develop
    small pore. The effect on developing residual oil is especially significant to the main flow area. The central area is critical to
    the recovery.

    Research on Influence Factors and Theoretical Value on Recovery Rate
    Jiang Fengguang1,2, Wang Xiaolin1
    2013, 35(6):  104-108.  DOI: 10.3863/j.issn.1674–5086.2013.06.014
    Asbtract ( 257 )   PDF (393KB) ( 552 )  
    References | Related Articles | Metrics

    Recovery rate is one of the key development index which can affect the ultimate development effect of oilfields
    whether it remains high or low,therefore,the researches of reasonable recovery rate and influence factors play an important
    role in production decision of oilfields. Previous authors researched the recovery rate mainly based on reservoir numerical
    simulation and mathematical statistics,however,the certain limitation is both theoretic and applied aspects. Based on the flow
    fraction equation,we create the relation expression among recovery rate and reservoir properties,water cut and annual ascending
    velocity of water cut,and analyze the influence of individual factor on recovery rate. The theoretical analysis result shows that
    coefficient b by regression between ratio of oil to water relative permeability and water saturation is negative correlation to
    recovery rate. Water cut is negatively correlated to recovery rate when fw<50%,and positively correlated when fw>50%. At
    different stages of water cut,the faster the velocity of water cut ascends,the higher recovery rate could be. The method discussed
    in this paper could be applied to the evaluation of theoretical recovery rate of certain reservoir at different development stages

    Study on the Seepage Law of Oil-water During Development of
    Changyuan Reservoir
    Wei Hongtao1, Lin Yubao1, Shi Jingping1, Yang Shuang2, Zhou Yu3
    2013, 35(6):  109-114.  DOI: 10.3863/j.issn.1674–5086.2013.06.015
    Asbtract ( 231 )   PDF (537KB) ( 475 )  
    References | Related Articles | Metrics

    The Changyuan Reservoir of Daqing Oilfield has entered the stage of high water cut,WOR rising sharply. Oil and
    water distribution and develop performance there have change greatly. For the knowledge of the oil and water fluid flow law,
    we derived the water flooding characteristic curve formula and development index for Changyuan Reservoir,and we study the
    actual block water cut rate and water ratio,water ratio and water cut rate with recovery degree,productivity index decrement
    and water ratio,relative fluid productivity index and productivity factor oil with the change of water cut trend. We clearly
    understand the oil and water seepage rule of the reservoirs in the process of exploiting,it provides some guidance for related
    development and research.

    Study of the Test Method of Key Mechanical Parameters of Set Cement in
    the Gas Storage Well
    Liu Jian1, Guo Xiaoyang2, Li Zaoyuan2
    2013, 35(6):  115-120.  DOI: 10.3863/j.issn.1674–5086.2013.06.016
    Asbtract ( 255 )   PDF (550KB) ( 537 )  
    References | Related Articles | Metrics

    For the purpose of measuring the key mechanical parameters of set cement in the gas storage well:tensile strength
    and bonding strength,two new test methods were designed for the two mechanical parameters respectively. Through test
    measurement and comparative analysis of 6 sets of typical set cement from the gas storage well,we found that the new methods
    have better and more reasonable results. The tensile strength of typical set cement from the gas storage is in the range of
    1.5∼3.5 MPa,which is about 7%∼13% of the compressive strength. The mechanical modification to cement has remarkable
    effects on the cement′s tensile strength. The longitudinal bonding strength of low density cement is about 0.7∼1.5 MPa,and
    the normal density cement is roughly 1.5∼2.5 MPa,which is far enough for supporting casing weight. The cement dangerous
    points because of the casing acting are not on the vertical but on the horizontal.

    Methodological Discussion and Factor Analysis on Choosing Wells and
    Layers for Water Plugging in Tahe Oilfield
    Qin Fei, Wu Wenming, Yang Jianqing, Liu Guangyan, He Long
    2013, 35(6):  121-126.  DOI: 10.3863/j.issn.1674–5086.2013.06.017
    Asbtract ( 145 )   PDF (556KB) ( 502 )  
    References | Related Articles | Metrics

    Tahe Oilfield is typical fractured-vuggy carbonate reservoir,which is seriously inhomogeneous and has active bottom
    water. Because of the high development rate early,water flooding,water coning and water channeling gradually worsen. Well
    shutin,narrow nozzle and water injection for coning control are failure at some degree,so water plugging is becoming the
    main method for stabilizing oil production and controlling water cut. As the first step,choosing wells and layers is directly
    relative to effect of water plugging,therefore,it′s precondition of success when water plugging. This paper summarizes some
    significant factors from aspects of geology,development,engineering and technology when choosing wells and layers for
    water plugging,combing with specific practice of water plugging in Tahe Oilfield. Then we make a comparison among for
    comprehensive analysis using five kind of basic information,weight analysis and artificial neural network,and finally put
    forward the theory of systematical well choosing. These factors and means have an important meaning for water plugging in
    carbonate reservoir of Tahe Oilfield,which is also suitable for the similar reservoir.

    Analysis for Transient Deliverability of Herringbone Gas Well and
    Optimum Configuration of Lateral Holes
    Jiang Kai1, Li Min2, He Zhixiong2, Xue Guoqing1
    2013, 35(6):  127-132.  DOI: 10.3863/j.issn.1674–5086.2013.06.018
    Asbtract ( 206 )   PDF (486KB) ( 452 )  
    References | Related Articles | Metrics

    Based on gas transient flow theory,the pseudo-pressure drop analytical solution of horizontal gas well was derived
    according to Newman′s product principle and Green function,the transient deliverability model of plane herringbone horizontal
    gas well was established with the coordinate conversion and pressure-drop superposition principle. Production of herringbone
    gas well and inflow of each section were calculated by discrete computation. The rule of gas yield change and production time
    was studied with the gas productivity model with nodal system analysis,and the lateral location,lateral angle and the number
    of laterals were analyzed to obtain the appropriate location,the rational lateral angle,and the reasonable number of laterals,
    which provide theoretical basis for optimization design of herringbone gas well.

    Research on Cementing Technology of Low Permeability and Pressure
    Layers in Daniudi Gas Field
    Song Jian
    2013, 35(6):  133-140.  DOI: 10.3863/j.issn.1674–5086.2013.06.019
    Asbtract ( 265 )   PDF (616KB) ( 412 )  
    References | Related Articles | Metrics

    Cementing quality is often poor in Daniudi Gas Field in the beginning of exploration,so we carried on the analysis
    of the engineering geology,drilling fluid and mud,and so on,and got the main factors which influence on the cementing
    quality with the method of experiment comparison. Measures were taken to improve the bonding quality through optimization
    of cementing method,mud performance and cement slurry. Based on the grain composition theory,cement additives were
    changed to improve the cement performance. By enhancing the gas migration control of cement slurry,excellent performance
    of slurry was achieved. Cement slurry test procedure were rearranged to eliminate the influence of mixing energy. To improve
    the displacement,the drilling fluid was optimized to get a stable and regular borehole. Cementing operation was developed and
    excellent bonding quality achieved.

    Research on Water Control and Water Shutoff Technologies of Organic-Gel
    Jia Hu, Pu Wanfen
    2013, 35(6):  141-152.  DOI: 10.3863/j.issn.1674–5086.2013.06.020
    Asbtract ( 324 )   PDF (761KB) ( 945 )  
    References | Related Articles | Metrics

    This paper gives an update review on the progress of researches on organic-gel used for water shutoff and conformance
    control. Five kinds of popular gel systems such as bulk gel,organosilicon gel,thermosensitive/salt-sensitive/pH sensitive
    gel,in-situ polymer gel and polymeric microsphere are included. This paper introduces the working mechanism,merits and
    demerits and field application of each gel system. Polyethyleneimine(PEI)cross-linking gel system has advantages of being
    low toxic,high-temperature and high salinity tolerant etc. This gel system can be used for water shutoff in hardness reservoirs.
    From the tendency of water control of chemical methods,synthesizing various functional polymeric microsphere which can
    match with pore throat will receive great attention in the next decades. This paper has achieved some research progress in
    organic-gel used for water shutoff and conformance control,which can offer favourable reference for related work and field
    application.

    Optimization in Heavy Oil Thermochemistry Dehydration Process
    Kou Jie1, Yang Wen1, Wang Xiuzhen2
    2013, 35(6):  153-158.  DOI: 10.3863/j.issn.1674–5086.2013.06.021
    Asbtract ( 175 )   PDF (514KB) ( 493 )  
    References | Related Articles | Metrics

    The experimental study of heavy oil thermochemistry dehydration was carried out on the base of heavy oil mixed with
    a certain proportion of diluent oil,combined with the optimization demulsifier. 4050 demulsifier had better dehydration effect
    for the heavy oil and diluent oil used,and through the comparison of the viscosity reduction rate and the dehydration effect,
    the ratio of dilute proportion 1:1 was determined. On this basis,the impact of temperature,concentration of demulsifier on
    dehydration were studied,and the impact of water cut content on the effective concentration range of demulsifier and effective
    temperature range were also studied. The experimental results show that:at certain demulsifier concentration range,an effective
    concentration range may not exist at the lower temperature,which will be larger at higher temperatures;at a certain dehydration
    temperature,demulsifier effective concentration range will be larger as water cut content increases;at a certain demulsifier
    concentration,demulsification effective temperature range will also be larger as water cut content increases.

    Simulation Based on the CFD of Self-propulsion Nozzle’s Flow Field
    Hu Kun1, Peng Xu2, Li Jie3, Fu Biwei1, Ai Zhijiu1
    2013, 35(6):  159-165.  DOI: 10.3863/j.issn.1674–5086.2013.06.022
    Asbtract ( 244 )   PDF (706KB) ( 626 )  
    References | Related Articles | Metrics

    The self-propulsion jet flow is the core component in radial hydraulic deep penetrating production process for low
    permeability oil well. Based on the computational fluid dynamics(CFD)approach,we studied the internal and external flow
    field of the nozzle,and calculated the propulsive force of the nozzle. The results show:(1)the flow field from the nozzle will
    generate the local high pressure area in bottom hole,which help to break rock.(2)Water jet low from the nozzle will form the
    symmetrical wall shear force to help to improve the wall rock break at bottom hole.(3)Jet nozzle flow passage of the maximum
    speed tends to be concentrated on one side wall surface,which may make the nozzle structure wear,so the optimization of the
    nozzle structure will helps to improve the jet nozzle jet flow field,and its life.(4)Calculated nozzle propulsion force by using
    CFD approach is consistent the real measured results,so it is feasible to use CFD to prediction nozzle propulsion.

    Application of HZM Bi-fuel System on Power Package of
    Deep Drilling Rig
    Li Xunji1, Long Ping1, Xiong Jiyou2, Xuan Peichuan3, Hou Bingren4
    2013, 35(6):  166-172.  DOI: 10.3863/j.issn.1674–5086.2013.06.023
    Asbtract ( 171 )   PDF (554KB) ( 425 )  
    References | Related Articles | Metrics

    HZM bi-fuel system can substitute the diesel fuel by controlling the gas which enters the diesel engine,but the gas
    does not participate in the speed control,and the system requires no major changes or modifications. The introduction of HZM
    bi-fuel system used in deep well drilling at Tarim Oilfield is one of the best ways to reduce cost and protect environment. Field
    application shows that diesel engine has good economic benefit when the diesel substituting rate is 40% and running under the
    rated power of 30%~80%. Employment and suitability test researching the improvement of these two kinds of power package,
    performance of bi-fuel system,effect of bi-fuel operation on the unit,indicate that bi-fuel system can meet all the drilling
    conditions. During the last two years,HZM bi-fuel system has been applied by 9 drilling crews in 14 wells has consumed
    about 301×104 m3 natural gas. HZM bi-fuel system is highly worth popularizing because of its economic benefit,safety and
    reliability.

    Analysis of the Fluid Flow Field Near Wellbore Wall of
    Gas-well Perforated Completion in Yuanba
    Lian Zhanghua1, Ding Shidong2, Zhao Xu2, Zheng Jianxiang1,3, Luo Wenhao1
    2013, 35(6):  173-180.  DOI: 10.3863/j.issn.1674–5086.2013.06.024
    Asbtract ( 193 )   PDF (1015KB) ( 575 )  
    References | Related Articles | Metrics

    The wells in Chuandong Yuanba are mainly extra-depth horizontal gas wells. Because the density,viscosity and
    compressibility coefficient of nature gas vary with the temperature and pressure,the problems of the fluid flow field near
    wellbore wall of the gas-well perforated completion are not solved with the analytical method. In the paper,the 3D fluid
    flow finite element model(FEM)near the wellbore wall is established with the COMSOL Multiphysics software. The model
    includes the wellbore size,perforation depth,perforation diameter,perforation density,phasing angle,drilling damage degree,
    permeability,gas density,viscosity as well as compressibility coefficient,and so on. We can change the arbitrary parameter
    to get the distribution of the fluid flow field near the wellbore wall. Based on the fluid flow model in the paper,the reciprocal
    interference near wellbore fluid flow field under the different phasing angles and different perforation density was analyzed in
    details. It provides the theoretical supports for the optimal design of the perforated completion parameters in horizontal gas
    well.