ABSTRACTS AND KEY WORDS

ZHAO Zhengwang,WU Changjiang and YUAN Baoguo（Exploration and Development Research Institute,PetroChina Southwest Oil and Gasfield Company）.NATURAL GAS EXPLORATION&DEVELOPMENT.v.39 no.2,pp.1-5，6/25/2016

HAO Jingyu,PAN Lei,LI Jixuan,LI Feng,MA Chenxian,ZHANG Wenrui and LI Xuwen（Sinopec Exploration Company）.NATURAL GAS EXPLORATION&DEVELOPMENT.v.39 no.2,pp.6-12，6/25/2016

XU Shengli1,LI Bingying2,WANG Zhonghua1,WANG Lamei1and LIU Chuanchuan1（1.CNOOC EnerTech-Drilling&Production Company;2.CNOOC Shanghai Company）.NATURAL GAS EXPLORATION&DEVELOPMENT.v.39 no.2,pp.22-25，6/25/2016

XUE Hui,DOU Lianbin,LV Yahui,XIAO Boya,QI Qiuhong and JIAO Suli（Geophysical Exploration Research Institute，Huabei Oilfield Company,PetroChina Huabei Oilfield Company）. NATURAL GAS EXPLORATION&DEVELOPMENT.v.39 no.2,pp.26-30，6/25/2016

ZHOU Kai1,SUN Wei1,WANG Zheng2,ZHANG Yiguo1and MA Yongping3（1.State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University;2,No.4 Gas Production Plant,PetroChina Changqing Oilfield Company;3.PetroChina Research Institute of Petroleum Exploration&Development-Northwest）.NATURAL GAS EXPLORATION&DEVELOPMENT.v.39 no.2,pp.31-35，6/25/2016

SHEN Jincai,LIU Yaowen,GE Lan and LI Peng（Sinopec Chongqing Fuling Shale Gas Exploration and Development Corporation）.NATURAL GAS EXPLORATION&DEVELOPMENT.

SONG Yannan1,QU Zhanqing1and XIAO Chunjin2（1.School of Petroleum Engineering, China University of Petroleum;2.Petroleum Engineering Technology Institute,Sinopec Shengli Oilfield Company）.NATURAL GAS EXPLORATION&DEVELOPMENT.v.39 no.2,pp.50-53，6/

WANG Yongjun（Sinopec Exploration Company）.NATURAL GAS EXPLORATION&DEVELOPMENT.v.39 no.2,pp.54-57，6/25/2016

ZHAO Zhiheng1,2,LI Xiao1,ZHANG Bo1,2,GAN Bing3and LI Guanfang1（1.Institute of Geology and Geophysics,Chinese Academy of Sciences;2.University of Chinese Academy of Sciences; 3.Research Institute of Safety and Environmental Protection&Technical Supervision,PetroChina Southwest Oil&Gasfield Company）.NATURAL GAS EXPLORATION&DEVELOPMENT.v.39

TANG Yong（Western Sichuan Gas Recovery Plant,Sinopec Southwest Oil&Gas Company）.NATURAL GAS EXPLORATION&DEVELOPMENT.v.39 no.2,pp.64-66，6/25/2016

ZHANG Jie,Qu Kun,ZHANG Jianjia and CHEN Gang（College of Chemistry and Chemical Engineering,Xi’an Petroleum University）.NATURAL GAS EXPLORATION&DEVELOP

LEI Zumeng and SI Xiqiang（Drilling Engineering Technology Institute,Sinopec Zhongyuan Petroleum Engineering Co.,Ltd.）.NATURAL GAS EXPLORATION&DEVELOPMENT.v.39 no. 2,pp.72-74，6/25/2016

ZHANG Jian1,LIU Chang2,LI Hongzhen1,HU Defen1and SU Shangtian1（1.Chongqing Gas District,PetroChina Southwest Oil and Gasfield Company;2.Sichuan Huayou Group Corporation, Limited,PetroChina Southwest Oil and Gasfield Company）.NATURAL GAS EXPLORATION& DEVELOPMENT.v.39 no.2,pp.78-81，6/25/2016

LIANG Bing1,LIU Dehua1,LI Hongzhen1,LI Yongshu1,CHEN Zuobo1,LIU Lian1,ZHANG Xu2and BAI Shangyang3（1.Chongqing Gas District,PetroChina Southwest Oil and Gasfield Company;2.ChongqingUniversityofScience&Technology;3.ZigongLightIndustryDesignandResearch Institute）.NATURAL GAS EXPLORATION&DEVELOPMENT.v.39 no.2,pp.82-85，6/25/2016

S AND KEY WORDS

ORIGIN OF DEEP AND HIGH-QUALITY RESERVOIR OF THE UPPER TRIASSIC XUJIAHE 2 MEMBER NORTHWESTERN SICHUAN BASIN

ZHAO Zhengwang,WU Changjiang and YUAN Baoguo（Exploration and Development Research Institute,PetroChina Southwest Oil and Gasfield Company）.NATURAL GAS EXPLORATION&DEVELOPMENT.v.39 no.2,pp.1-5，6/25/2016

ABSTRACT：In northwestern Sichuan Basin,the Xujiahe 2 Member dominantly belongs to tight sandstone reservoirs.Some high-quality Xujiahe reservoirs may be still found below 4000 m of burial depth.Residual primary intergranular pore,intergranular dissolution pore,intragranular pore,and fracture are developed in these deep and high-quality reservoirs with.Our study demonstrates that（1）to form these reservoirs is related to original deposition condition,diagenesis,formation overpressure,and fracture；（2）original deposition condition is the basis and premise to form high-quality reservoirs-the property of parent rock and the detatic frontal deposition not only bring about low content of carbonate in original deposits but also generate a large-scale welldeveloped quartzose sandstone and lithic quartzose sandstone with high texture and composition maturity,thereby to effectively stand up to compaction from overlying strata；（3）chlorite lining was developed in most quartz grains during an early stage in order to control the forming of secondary quartz and conceal an increase of overlying pressure,finally resulting in keeping primary pore；（4）undercompaction may decease the effect of normal compaction on porosity,which is favorable for forming these deep and high-quality reservoirs;and（5）facture,as the better reservoir space,may connect pore very effectively and increase the mobility among pore fluid.

primary pore,formation overpressure,deep high-quality reservoir,Xujiahe 2 Member,northwestern Sichuan Basin

SEDIMENTARYSEQUENCESTRUCTUREANDSANDBODYDEVELOPMENT MODE OF NIUBAO FORMATION,EASTERN LUNPOLA BASIN,TIBET

HAO Jingyu,PAN Lei,LI Jixuan,LI Feng,MA Chenxian,ZHANG Wenrui and LI Xuwen（Sinopec Exploration Company）.NATURAL GAS EXPLORATION&DEVELOPMENT.v.39 no.2,pp.6-12，6/25/2016

ABSTRACT：Based on the latest seismic and drilling data,the Niubao Formation,eastern Lunpola Basin in Tibet,can be classified into 8 six-order sequences according to different evolutional stages.Meanwhile,the isochronal stratigraphic framework is established,and both elemental features and structural framework of these sequences are defined.Then,its sedimentary system can be subdivided into four types of underwater fan,fan deltaic,lacustrine and alluvial fan on the basis of some characteristics of lithological facies,electrofacies,and seismic facies.Many distribution features in different sequence stages and their effect on sandbody development are also identified.At last,a conclusion that there are four types of reservoir sandbody are made,including glutenite body in frontal fault-controlled slope belt,fan deltaic sandbody in gentle slope belt, glutenite body in flood density flow,and lacustrine-facies lenticular sandbody.Results show that the glutenite body in frontal fault-controlled slope belt is the most favorable and the fan deltaic sandbody in gentle slope belt is the most potential one for exploration.

KEY WORDS：reservoir sandbody,depositional system,Niubao Formation,Lunpola Basin

RESERVOIR CHARACTERISTICS AND MAIN CONTROLLING FACTORS OF CALLOVIAN-OXFORDIAN,WESTERN RIGHT BANK OF THE AMU DARYA

LI Hanyun,LIU Yong,XU Jianting and DONG Guoguo（Exploration and Development Research Institute,PetroChina Southwest Oil and Gasfield Company）.NATURAL GAS EXPLORATION&DEVELOPMENT.v.39 no.2,pp.13-17，6/25/2016）

ABSTRACT：For the Callovian-Oxfordian reservoir,western right bank of the Amu Darya,its characteristics were studied by some core analysis.Moreover,many favorable reservoir zones were determined on the basis of seismic result.Our study demonstrates that in this area,（1）the reservoir is mainly composed of calcarenite and bioclastic limestone；（2）its space includes secondary dissolution pore,residual primary pore,and fracture；（3）it is wholly characterized by low porosity and low permeability；（4）in longitudinal,affected by facies control in the sedimentary stage,dissolution in the diagenetic stage,and structural fracture in the later stage,this reservoir can be found in three strata,containing XVac,XVp,and XVm,their individual thickness is thinner；（5）horizontally,this reservoir is discontinuous;and（6）in planar,it can be found mainly in three areas of Gadyn,North Gadyn,and Westkishtuwan.

KEY WORDS:controlling factor,reservoir characteristics,Callovian-Oxfordian,Turkmenistan,right bank of the Amu Darya

RESERVOIR EVALUATION OF THE MIDDLE PERMIAN LOWER SHIHEZI FORMATION,DONGSHENG GASFIELD,ORDOS BASIN

XU Wenxi1and LI Lingchuan2（1.Oil and Gas Engineering Service Center,Sinopec North China Company;2.No.1 Oil Production Plant,Sinopec North China Company）.NATURAL GAS EXPLORATION&DEVELOPMENT.v.39 no.2,pp.18-21，6/25/2016

ABSTRACT：Based on a comprehensive analysis on thin-section identification,porosity and permeability,and mercury-injection curves,the clastic reservoir characteristics of Shihezi Formation in Dongsheng gasfield were studied.Results show that（1）the lower Shiehezi,which belongs to proximal deposits,is composed of hard sandstone with better cementation,lower maturity,and medium to poor sorting and psephicity；（2）its pore type contains mainly intragranular and intergranular dissolution pore,and a few microfractures；（3）its cementation type is dominated by pore cementation,point or line contact is among particles,particle size is middle-to coarse-grained but with most coarse particles；（4）in this study area,the main target formation is characterized by higher displacement and median pressure,smaller pore-throat radius,and higher permeability in partial reservoirs；and（5）the lower Shihezhi Formation can be classified into four types,including type I,type II,type III,and type IV,in which the first three ones belong to reservoir rocks but their property becomes gradually poorer in order,and the last one is nonreservoir.

KEY WORDS:Ordos Basin,Dongsheng gasfield,lower Shihezhi Formation,reservoir characteristics,evaluation of reservoir classification

APPLICATION OF 2D SEISMIC FORWARD MODEL TO HUANGYAN GASFIELD

XU Shengli1,LI Bingying2,WANG Zhonghua1,WANG Lamei1and LIU Chuanchuan1（1.CNOOC EnerTech-Drilling&Production Company;2.CNOOC Shanghai Company）.NATURAL GAS EXPLORATION&DEVELOPMENT.v.39 no.2,pp.22-25，6/25/2016

ABSTRACT：For some main reservoirs in a certain oil and gasfields,the East China Sea,their average thickness is generally thin and its lateral variation is very fast.So,some conventional seismic methods to predict these reservoirs are featured by low accuracy,which can not meet the demand of well deployment.In order to increase an accurate of drilling prediction,one approach of multi-seismic forward model is adopted and to optimally select model is carried out.As a result, the forward model gives a better guidance to well deployment and drilling prediction.

KEY WORDS:seismic,model,virtual well,forward,optimal selection

EFFECT OF MUD INVASION ON ARRAY-INDUCTION RESISTIVITY LOGGING AND RESISTIVITY CHARACTERISTICS:AN EXAMPLE FROM THE FOURTH MEMBER OF SHAHEJIE FORMATION,W 10 FAULT BLOCK,LANGGU SAG

XUE Hui,DOU Lianbin,LV Yahui,XIAO Boya,QI Qiuhong and JIAO Suli（Geophysical Exploration Research Institute，Huabei Oilfield Company,PetroChina Huabei Oilfield Company）. NATURAL GAS EXPLORATION&DEVELOPMENT.v.39 no.2,pp.26-30，6/25/2016

ABSTRACT：During an array-induction logging in many oil and gas layers,W 10 well block, Langgu sag,the resistivity characteristics are very complex,which appear positive difference,lowresistivity annulus,and high-resistivity annulus.However,only adopting a positive-difference mode to implement an interpretation is not good.Based on mud-invasion mechanism,a numerical simulation of resistivity is implemented by means of Archie’s equation.Results show that both displacement and diffusion of mud filtrate can lead to resistivity variation-the former results in a decrease of resistivity whereas the latter brings about an increase.In addition,a mode diagram to form both low-resistivity and high-resistivity annulus has been built up.We consider that not only the amounts of mud filtrate and formation-water resistivity but also the relationship between mud filtrate and oil-water-phase permeable rate are the reasons to form these annulus.Finally,different formation-fluid types with various resistivity are identified by adopting an approach of cumulative difference.And this identification has obtained a better application effect.

KEY WORDS:Langgu sag,mud invasion,array-induction logging,numerical simulation,lowresistivity annulus,high-resistivity annulus

RELATIVE-PERMEABILITYCHARACTERISTICSOFTIGHTSANDSTONE RESERVOIR FROM SHIHEZI 8 TO SHANXI 1 MEMBERS,EASTERN SULIGE GASFIELD

ZHOU Kai1,SUN Wei1,WANG Zheng2,ZHANG Yiguo1and MA Yongping3（1.State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University;2,No.4 Gas Production Plant,PetroChina Changqing Oilfield Company;3.PetroChina Research Institute of Petroleum Exploration&Development-Northwest）.NATURAL GAS EXPLORATION&DEVELOPMENT.v.39 no.2,pp.31-35，6/25/2016

ABSTRACT：Most sandstone reservoirs in eastern Sulige gasfield,Ordos Basin,are featured by tight lithology and more complex seepage laws.So,to study their relative-permeability characteristics is significant.In this study,the natures of one reservoir from Shihezi 8 to Shanxi 1 membersare obtained by means of gas-water relative-permeability experiment,casting thin-section identification,high-pressure mercury-injection and constant-rate mercury-injection analysis.Moreover,the gas-water relative-permeability curves can be divided into four types,containing type I, type II,type III,and type IV,in which some reservoirs with the middle two curves have a wide distribution.This study also demonstrates that pore-throat radius size,pore-throat sorting,and pore-throat connectivity are the main factors impacting on seepage property.

KEY WORDS:eastern Sulige gasfield,tight sandstone reservoir,relative permeability,pore structure

ESTABLISHMENTOFTYPICALPRODUCTION-DECLINECURVESFOR SHALE GAS WELLS,JIAOSHIBA BLOCK,FULING AREA

SHEN Jincai,LIU Yaowen,GE Lan and LI Peng（Sinopec Chongqing Fuling Shale Gas Exploration and Development Corporation）.NATURAL GAS EXPLORATION&DEVELOPMENT.

v.39 no.2,pp.36-40，6/25/2016

ABSTRACT：In this study,some production-decline laws are summarized by means of comparing conventional gas wells with shale gas wells in North America.Moreover,taking 9 shale gas wells from Jiaoshiba block in Fuling area as examples,we established their typical curves of production decline.Eliminating the effects of the different production systems,frequent adjustable allocation,and shut in,suitable typical curves of hyperbolic decline,decline index,and decline rate are presented through a relationship between normalized pseudo yield and material-balance time.Typical curves of A 50,A 30,and A 20 are built and factors affecting these curves are analyzed.In addition,both deliverability and recoverable reserves are evaluated by adopting these curves.

KEY WORDS:shale gas,production decline,hyperbolic decline,decline index,decline rate

ANALYSIS AND COUNTERMEASURES OF PRODUCING WATER IN YANGGUYI GASFIELD

ZHANG Li1,ZHANG Xiaodong1and LENG Youheng2（1.Geologic Exploration&Development Research Institute,CNPC Chuanqing Drilling Engineering Company Limited;2.Development Department of CNPC(Turkmenistan)Amu Darya River Gas Company）NATURAL GAS EXPLORATION&DEVELOPMENT.v.39 no.2,pp.41-44，6/25/2016

ABSTRACT：Located at the center of B block,right bank of the Amu Darya,Yangguyi gasfieldis just a small to medium-sized field.After one-year production,formation water appeared unexpectedly.And water yield rose greatly a few months later.In order to understand water-producing causes and achieve better development results,based on the characteristics of production performance,and the full integration of static and dynamic data,this article analyzes the sources of water body and water-producing types,determines water invasion characteristics and modes,and proposes countermeasures for water controlling.Over six-month practices show that the analysis is accurate and consistent with the actual one;the suggestions that reducing production and controlling water at the early stage,adhering flowing drainage gas recovery,lowering the rate of strip gas production,and frequently monitoring water sample are timely and effectively.At present,production is relatively smooth,and high-efficient development has achieved.That provides a technical reference for the similar gas reservoirs.

KEY WORDS:right bank of the Amu Darya,carbonate gas reservoir,edge-water invasion,water channeling along fractures,drainage gas recovery

NUMERICAL SIMULATION OF CO2-INJECTION DEVELOPMENT AND OPTIMIZATION OF DEVELOPMENT SCHEME,LIANCHI TIGHT OIL RESERVOIR IN SICHUAN BASIN

CAO Yi1,KONG Ling1,LIU Yicheng1,LU Xiaomin1,LIANG Hua2and LUO Yu1(1.Exploration and Development Research Institute,PetroChina Southwest Oil and Gasfield Company;2. CNPC South East Asia Pipeline Company Limited).NATURAL GAS EXPLORATION&DEVELOPMENT.v.39 no.2,pp.45-49，6/25/2016

ABSTRACT:In Sichuan Basin,Lianchi gasfield is a tight oil reservoir with extra-low porosity of about 3%and permeability ranging from 0.0001 mD to 0.1 mD,and its primary recovery is only 2.51%,further bringing about great difficulties in its development.So,a scheme to implement CO2injection is proposed.One reservoir of Daanzhai Member from this reservoir was taken as a case study.Based on its reservoir characteristics,reservoir-fluid features,and some physical parameters of crude oil,a compositional model of CO2-displacement dual porosity media was established for Lian 7 well block.Furthermore,according to CO2oil displacement rate and recovery increment, an effect of CO2-injection was evaluated.Results show that periodic huff and puff can be taken as the best gas-injection way during a CO2-injection;and the best soak time and reasonable injection-production cycle should be three months and four years,respectively.The best gas-injection scheme obtained provides technological evidence of CO2injection for other tight oil reservoirs inSichuan Basin.

KEY WORDS:tight oil reservoir,CO2injection,experimental match,numerical simulation,oil displacement rate,scheme optimization

DECISION METHODS FOR EVALUATING LOW-PERMEABILITY BEACH-BAR SANDSTONE RESERVOIRS DEVELOPED BY HYDRAULIC FRACTURING

SONG Yannan1,QU Zhanqing1and XIAO Chunjin2（1.School of Petroleum Engineering, China University of Petroleum;2.Petroleum Engineering Technology Institute,Sinopec Shengli Oilfield Company）.NATURAL GAS EXPLORATION&DEVELOPMENT.v.39 no.2,pp.50-53，6/

25/2016

ABSTRACT：For many low-permeability beach-bar sandstone reservoirs,to develop a suite of decision methods is very significant for pre-fracturing evaluation in order that their fracturing becomes more and more efficient.In this study,a pre-fracturing evaluation was implemented for some candidate wells by means of fuzzy integration evaluation and grey relational analysis;and then,some factors influencing on post-fracturing deliverability were summed up;finally some decision methods to guide fracturing scheme design form.This pre-fracturing evaluation combines mathematical analysis with engineering experience and takes reservoir property affecting postfracturing deliverability into consideration.The analysis on influencing factors summarizes the effects of both petrophysical property and operating parameters on post-fracturing deliverability, and significantly guides for other wells in this study area to develop their fracturing scheme design.As a result,there are 5-class cements designed for the pre-fracturing evaluation.And these critical influencing factors are analyzed and other factors affecting operating parameters are presented.Our study provides reliable evaluation and decision-making methods for fracturing beachbar sandstone reservoirs.

KEY WORDS:pre-fracturing evaluation,laws of influencing factor,fuzzy integration evaluation,grey relational analysis

TECHNOLOGY OF ULTRA-HIGH PRESSURE FRACTURING TEST FOR DEEP AND TIGHT SANDSTONE GAS RESERVOIRS,YUANBA BLOCK

WANG Yongjun（Sinopec Exploration Company）.NATURAL GAS EXPLORATION&DEVELOPMENT.v.39 no.2,pp.54-57，6/25/2016

ABSTRACT：In Yuanba block,most sandstone gas reservoirs of Xujiahe Formation are featuredby deep burial depth,high temperature,ultra-high pressure,tight lithology,strong heterogeneity, and high fracture and extension pressure.In this study,5 layers from 4 wells were optimally selected.And an ultra-high pressure fracturing test was carried out by using 140 MPa gas-producing wellhead and 140 MPa ultra-high pressure fracturing equipment.The top pressure reached 118.5MPa,and 5.5 m3/min for the maximum displacement,respectively.The 100%of success rate of the operation can be a reference for ultra-high pressure fracturing test of the similar gas reservoirs.

KEY WORDS:Yuanba block,deep and tight sandstone gas reservoir,ultra-high pressure fracturing,Y16 well

EXPERIMENTAL STUDY ON SUPERCRITICAL CO2FRACTURING

ZHAO Zhiheng1,2,LI Xiao1,ZHANG Bo1,2,GAN Bing3and LI Guanfang1（1.Institute of Geology and Geophysics,Chinese Academy of Sciences;2.University of Chinese Academy of Sciences; 3.Research Institute of Safety and Environmental Protection&Technical Supervision,PetroChina Southwest Oil&Gasfield Company）.NATURAL GAS EXPLORATION&DEVELOPMENT.v.39

no.2,pp.58-63，6/25/2016

ABSTRACT：As a kind of fluid between gas and liquid states,supercritical CO2is characterized by low surface tension,high diffusion coefficient,and strong infiltrability.Its density is close to that of liquids,whereas the viscosity is similar to that of gases.During a fracturing,supercritical CO2can infiltrate into natural fractures and help forming a complex fracture network,and replace hydrocarbons adsorbed by rocks in favor of oil and gas production.In addition,its extra-low surface tension benefits fluid flowback,thus reducing formation damage.As a development trend of CO2fracturing,supercritical CO2fracturing fluid not only can economize water resource,but also has some advantages such as high flowback rate,small reservoir damage,and large potential of production increase.Experimental study shows that compared with water and liquid CO2fracturing,supercritical CO2fracturing has a lower fracture pressure.Its large fractal dimension and long average distance from acoustic emission source to plane may easily cause wavelike fractures and fractures with branches.The obtained complex fractures are conducive to forming fracture network.Therefore,supercritical CO2is especially suitable for the stimulation and effective development of shale gas.

KEY WORDS:supercritical CO2,supercritical CO2fracturing,experimental study,acoustic emission,fractured frac

GAS-LIFT DRAINAGE GAS RECOVERY TECHNOLOGY FOR HIGH-PRESSURE GAS SOURCE WELLS AND ITS APPLICATION EVALUATION

TANG Yong（Western Sichuan Gas Recovery Plant,Sinopec Southwest Oil&Gas Company）.NATURAL GAS EXPLORATION&DEVELOPMENT.v.39 no.2,pp.64-66，6/25/2016

ABSTRACT:There coexist high-pressure and low-pressure gas wells in some sites of Xinchang gasfield.Based on the analysis of critical fluid-carrying flow,combined with continuousloop gas lift,a test of gas-lift drainage gas recovery technology for high-pressure wells in the same site was carried on.The injection volume and connection type of high-pressure gas source wells were optimized and designed.This technology was applied to 5 well groups of Xinchang gasfield, resulting in remarkable effects.

KEY WORDS:high-pressure gas source well,gas lift,drainage gas recovery,application evaluation

EFFECTIVENESS OF FRESH WALNUT GREEN HUSK IN INHIBITED DRILLING FLUID

ZHANG Jie,Qu Kun,ZHANG Jianjia and CHEN Gang（College of Chemistry and Chemical Engineering,Xi’an Petroleum University）.NATURAL GAS EXPLORATION&DEVELOP

MENT.v.39 no.2,pp.67-71，6/25/2016

ABSTRACT：In this study,fresh walnut green husk pulp is used as an additive of inhibited and water-based drilling fluid,and its effectiveness is evaluated.By walnut green husk,the viscosity of drilling fluid has been obviously enhanced and the filtration controlled,bringing about an increase of mud-cake lubricity.With the increase of aging temperature,the viscosity ascends initially and then decreases gradually.About 150℃is the maximum temperature which the drilling fluid can resist.Compatibility experiments show that walnut husk pulp with modified starch can reduce the viscosity and control the filtration,whereas another one with polyacrylamide may increase the viscosity and control the filtration.Experiments on mud ball and linear expansion rate indicate that the hydrated shell formed by walnut husk pulp on clay surface may significantly enhance an anti-collapse performance of drilling fluid.And the inhibition is strengthened with the raising concentration of walnut husk pulp.Compared with common drilling fluid inhibitor,it has an obvious effect with less dosage.Particle-size analysis also demonstrates that as the additive,walnut husk pulp has certain flocculating effect on water-based drilling fluid.

KEY WORDS:fresh walnut green husk,water-based drilling fluid,inhibition,filtration control

DOMESTIC APG DRILLING FLUID

LEI Zumeng and SI Xiqiang（Drilling Engineering Technology Institute,Sinopec Zhongyuan Petroleum Engineering Co.,Ltd.）.NATURAL GAS EXPLORATION&DEVELOPMENT.v.39 no. 2,pp.72-74，6/25/2016

ABSTRACT:Domestic alkyl polyglycoside(APG)drilling fluid is analyzed and its application is also studied.Its development can be divided into three stages,i.e.MEG drilling fluid,modified MEG drilling fluid,and APG-derivative drilling fluid.For glycoside products in different stages, their characteristics and functions in drilling fluid,as well as the research and field application of drilling fluid with such products are analyzed.The dosage of the products is reduced to 0.5%~2% NAPG from the original 10%~30%liquid MEG.Furthermore,we discuss the development trend of such products,and put forward a suggestion researching environmental-friendly CAPG oil-based and NAPG high-performance water-based drilling fluids.That is a direction to solve collapse easily occurring in shale and mudstone strata with strong water sensitivity,and other problems in shale-gas horizontal-well drilling.

KEY WORDS:alkyl polyglycoside,drilling fluid,cationic,research,application status

EQUIPMENT MATCHING TECHNOLOGY OF WATER HORSEPOWER FOR HIGHPRESSURE CEMENTING:AN EXAMPLE FROM WEIYUAN BLOCK

WANG Chunquan（Downhole Service Company,CNPC Chuanqing Drilling Engineering Company Limited）.NATURAL GAS EXPLORATION&DEVELOPMENT.v.39 no.2,pp.75-77，6/25/ 2016

ABSTRACT：With the exploration and development of unconventional oil and gas resources, high-pressure cementing is increasing gradually,but with few lessons from cementing equipment matching.In this study,a calculation of water horsepower during a cementing is introduced in Weiyuan block.Based on the principles of more than 60%maximum operating load,or over 80% maximum pressure and below 5 minutes of operating time,some cementing equipments are matched.As a result,one match of slurry pumping with completion fluid replacing by cementing truck under condition of high-pressure and low-water horsepower,as well as another match ofslurry pumping by cementing truck and completion fluid replacing by fracturing truck under condition of high-pressure and high-water horsepower are obtained.This matching technology has been successfully applied to drilling.It provides technical reference for the future equipment matching during high-pressure cementing.

KEY WORDS:high-pressure cementing,water horsepower,equipment matching,shale gas, Weiyuan block

CORROSION AND DISPLACEMENT CONTROL FOR GATHERING AND TRANSPORTATION DEVICE IN S-Y GASFIELD

ZHANG Jian1,LIU Chang2,LI Hongzhen1,HU Defen1and SU Shangtian1（1.Chongqing Gas District,PetroChina Southwest Oil and Gasfield Company;2.Sichuan Huayou Group Corporation, Limited,PetroChina Southwest Oil and Gasfield Company）.NATURAL GAS EXPLORATION& DEVELOPMENT.v.39 no.2,pp.78-81，6/25/2016

ABSTRACT:In S-Y high-sour gasfield,the corrosion type of ground pipelines is dominated by internal pitting.Pipelines with liquid loading may be seriously corroded inside.Furthermore,a high-temperature running may form thermal stress,further leading to ground valve lifted and manifold displaced.So,to effectively control corrosion and displacement,not only the corrosion mechanism and the adaptability of corrosion prevention were analyzed,but also the stress causing the displacement was calculated.By optimizing the filling system of inhibitor,we replaced the pipeline material of key part.Moreover,the adaptive technology of stress relief was improved. Field application shows that the corrosion can be effectively controlled,and the pipeline stress caused by thermal expansion is relieved and kept within recommended limits.

KEY WORDS:S-Y gasfield,gathering and transportation,device,corrosion,displacement

GASFIELD WATER TREATMENT USING SEPARATING TECHNOLOGY OF EVAPORATION AND CRYSTALLIZATION AND ITS APPLICATION PROSPECTS IN EASTERN SICHUAN BASIN

LIANG Bing1,LIU Dehua1,LI Hongzhen1,LI Yongshu1,CHEN Zuobo1,LIU Lian1,ZHANG Xu2and BAI Shangyang3（1.Chongqing Gas District,PetroChina Southwest Oil and Gasfield Company;2.ChongqingUniversityofScience&Technology;3.ZigongLightIndustryDesignandResearch Institute）.NATURAL GAS EXPLORATION&DEVELOPMENT.v.39 no.2,pp.82-85，6/25/2016

ABSTRACT：Along with an increase of water-injecting volume in rejection wells,their rejection ability declines gradually.With difficulties in choosing and constructing these wells,the way rejecting gasfield water by physical chemistry+deep well may not meet the requirements of production and development to a certain extent.So,by a separating technology of evaporation and crystallization,Cl-in the water can be processed to achieve a discharge standard,and gasfield water can be recycled.Based on the treatment principles of this technology and its application,we propose applying conditions and tentative ideas,and demonstrate the adaptability for some areas with large remaining gas reserves,stable water production,rejection difficulties,and complete rejection pipe network for water transferring in eastern Sichuan Basin.

KEY WORDS:gasfield water,separating technology of evaporation and crystallization,eastern Sichuan Basin,application prospect

翻譯何颋婷劉婕

審校何颋婷

編輯王曉清