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Study on gas-liquid relative permeability experiments of fractured-porous reservoirs

Petroleum 2017年第3期3卷 348-354页

作者： Ping Guo Huimin Zhang Jianfen Du Zhouhua Wang Wanbo Zhang Hongmei Ren State Key Laboratory of oil and gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu CitySichuan Province610500China East China University of Science and Technology Shanghai 2000237China exploration and Development Research Institute PetroChina Huabei Oilfield CompanyRenqiu062552China

For carbonate reservoirs,gas-water and oil-gas relative permeability curve are of importance for parameters calculation in oil-field development,dynamic analysis and numerical reservoir *** oil-gas/gas-water relative permeability curves were measured with unstable method under normal temperature and low pressure,using fifteen artificial fractured *** shape and change characteristics of gas/water and oil/gas relative permeability curve were mainly *** results showed that for the relative permeability curve of water driving *** saturation of equal permeability point,the saturation range of two-phase flow region and the displacement efficiency has a good power-function relation with core *** addition,the saturation of equal permeability point,the saturation range of two-phase flow region and the displacement efficiency will decrease with the increasing of core ***,for oil-gas relative permeability curves,the saturation of equal permeability point,the saturation range of two-phase flow region and the displacement efficiency will increase with the increasing of core *** should be noted that the gas relative permeability presents a straight line in the normalized relative permeability curve,which indicates that the main flow is dominated by fracture with low displacement *** research results provide theory basis for fracture-vuggy carbonate reservoir development and new research idea for the further study of this kind of reservoir.

关键词： Condensate reservoir Fractured-vuggy Unstable method gas-liquid relative permeability curve

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Numerical investigation of refracturing with/without temporarily plugging diverters in tight reservoirs

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Petroleum Science 2022年第5期19卷 2210-2226页

作者： Xiao-Hua Wang Feng-Shou Zhang Zi-Rui Yin Ding-Wei Weng Hong-Bo Liang Jun-Ping Zhou Bin Xu Shale gas Research Institute PetroChina Southwest Oil and Gas Field CompanyChengdu610051SichuanChina Key Laboratory of Geotechnical&Underground Engineering of Ministry of Education Tongji UniversityShanghai200092China Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai200092China Research Institute of Petroleum exploration and Development PetroChinaLangfang065007HebeiChina State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing400044China School of Resources and Safety Engineering Chongqing UniversityChongqing400044China Origin Geomechanics Inc. CalgaryT3H0X6Canada Department of Civil Engineering University of CalgaryCalgaryT2N1N4Canada

Refracturing is an importa nt technique to tap the potential of reservoirs and boost production in depleted oil and gas ***,fracture propagation during refracturing,including both conventional refracturing and temporary-plugging refracturing remains poorly understood,especially for cases with non-uniform distribution of formation pressure due to long-term oil production and water ***,taking pilot tests of refracturing with sidetracking horizontal wells in tight reservoirs in the Changqing oilfield,China as an example,we establish a three-dimensional numerical model of conventional refracturing and a numerical model of temporary-plugging refracturing based on the discrete lattice ***-uniform distributions of formation pressure are imported in these *** discuss the effects of key operating parameters such as injection rate,cluster spacing,and number of clusters on the propagation of multi-cluster fractures for conventional *** temporaryplugging refracturing,we examine the impacts of controlling factors such as the timing and number of temporary plugging on fracture *** addition,we analyze a field case of temporaryplugging refracturing using well P3 in the Changqing *** results show that fractures during re fracturing tend to propagate preferentially and dominantly in the depleted *** stimulation effect can be obtained with an optimal injection rate and a critical cluster *** proposed model of temporary-plugging refracturing can well describe the temporary plugging of dominant existingfractures and the creation of new-fractures after fracturing fluid is forced to divert into other clusters from previous dominant *** temporary plugging can improve the balanced propagation of multi-cluster fractures and obtain the maximum fracture *** established numerical model and research results provide theoretical guidance for the design and optimization of key operating pa

关键词： Tight reservoir Hydraulic fracturing Temporary plugging Discrete lattice method Multi-cluster fracturing

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Genetic types of carbonateshoal reservoirs: A case study of the Middle Triassic Leikoupo Formation in Sichuan Basin, SW China

Genetic types of carbonateshoal reservoirs: A case study of ...

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第十五届全国古地理学及沉积学学术会议

作者： Xiong Ding Han Wu Yuefeng Sun Hanghang Yu Zihao Zhao Jingshan Chen Qingsong Tang School of Geosciences and Technology Southwest Petroleum University Department of Geology and Geophysics Texas A＆M University Petro China southwest oil and gasfield company exploration division Chuanzhong oil and gas field of Petro China southwest Petroleum company

Carbonate shoal reservoirs of the Middle Triassic Leikoupo Formation in the Sichuan Basin were investigated for potential gas resources. The carbonate shoal reservoirs of the Leikoupo Formation in Sichuan basin can be divided by their genetic mechanism into residual intergranular pore type reservoirs, karstification type reservoirs（further divided into syndepositional, burial, and supergene types）, dolomitization type, and composite type. Residual intergranular pores and dissolved pores are the main reservoir spaces in the eponymous type. Isolated intragranular corroded pores and moldic pores are the main reservoir spaces in syndepositional karstification type. Dissolved pores and holes are the main reservoir spaces in burial karstification type. Different scales of pores and caves are the main reservoir spaces of supergene karstification type. Intercrystal pores and intercrystal solution pores are the main reservoir spaces of dolomitization type. Composite type reservoirs are characterized by a variety of reservoir spaces with pores, holes, and fissures. This analysis shows that the high-quality shoal reservoirs were formed by the superposition of carbonate shoals and constructive diagenetic modification.

关键词： genetic types reservoir carbonate shoal Leikoupo Formation Sichuan Basin

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Evaluation Methods of Profitable Tight oil Reservoir of Lacustrine Coquina: A Case Study of Da'anzhai Member of Jurassic in the Sichuan Basin

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Acta Geologica Sinica(English Edition) 2020年第2期94卷 418-429页

作者： PANG Zhenglian TAO Shizhen ZHANG Qin ZHANG Bin ZHANG Tianshu YANG Xiaoping WU Yinye FAN Jianwei YUAN Miao Research Institute of Petroleum exploration&Development PetrochinaBeijing 100083China

Based on core observation,cast and fluorescent thin sections,FESEM and ESEM,coquina in Da'anzhai Member of Jurassic in Sichuan Basin were examined *** with production data and logging evaluation,a method for lacustrine coquina evaluation based on geological theory was established *** the article,two aspects of the study were elaborated,characteristics of favorable reservoirs,and a"five-step"evaluation method for favorable coquina *** to the correlation between porosity and production data,porosity is not effective in finding high quality coquina reservoir of this *** micro research of reservoir samples from a high productivity well revealed that sparry coquina is the best lithofacies,with the most developed micro storage space of various *** the favorable reservoir was sorted out,a five-step method evaluating the coquina reservoir was worked *** ofGR value and rock types suggests that GR<30 API is an effective evaluation parameter in identifying profitable reservoir ***,the combination of profitable reservoir rock thickness and production data revealed that the reservoirs with the highest potentiality are those with thickness of 3-18 *** are more developed in faults,folds and structural noses in the study *** acid is discharged massively before the peak of hydrocarbon generation,leading to the formation of dissolution pores in the *** evaluation of organic acid was made by using the source rock *** evaluating the four factors,and compiling their distribution maps,the maps were overlapped to predict favorable reservoir zones,and 7 first class and 9 second class favorable zones of coquina were picked out.

关键词： coquina lithofacies logging evaluation favorable areas Sichuan Basin

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Structural characteristics of the basement and the prospective of favorable oil and gas blocks in the Tacheng basin

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Earthquake Science 2012年第5期25卷 527-534页

作者： Guoqing Zhang Junmeng Zhao Hua Bai Ming Wan Xiaoyang Guo Research Institute of exploration and Development Xinjiang Oilfield CompanyPetroChina Institute of Tibetan Plateau Research Chinese Academy of Sciences

The Tacheng basin has been identified as a Carboniferous basement with a central uplift, sur- rounded by orogenic belts. This identification was based on the comprehensive analysis of field outcrops, regional magnetic and gravimetric data, skeleton seismic profiles, magnetotelluric profiles and drilling data. Here, we present gravimetric and magnetic data analyses of the basement structures of the Tacheng basin and its base formation. We also provide a magnetotelluric profile analysis of the structural features and tectonic framework of basin-mountain patterns. We use local geology, drilling data, and other comprehensive information to document the tectonic framework of the basement of the basin. Small-scale nappe structures are found in the northern basin, whereas stronger and more pronounced thrusting structures are found to the south and east of the basin. The basin is divided into four first-order tectonic units： a central uplift, a northern depression, a southeastern depression and a western depression. In addition, the Emin sag is suggested as a possible reservoir for oil and gas.

关键词： northern Xinjiang Tacheng basin basement structure basin and mountain relation-ship tectonic unit division favorable area

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Discovery and identification of clay-sized tuffaceous rocks in Chang 7 Member of Upper Triassic Yanchang Formation in Ordos Basin,China

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Journal of Central South University 2020年第6期27卷 1814-1827页

作者： ZHENG Qing-hua LIU Xing-jun LIU Yi-qun ZHOU Ding-wu YOU Ji-yuan YANG Kai-yan School of Chemistry&Chemical Engineering Yulin UniversityYulin 719000China Changqing division China Petroleum Well Logging Limited CompanyXi’an 710201China Department of Geology Northwest UniversityXi’an 710069China College of Earth Science and Engineering Shandong University of Science and TechnologyQingdao 266510China Fengcheng field Operation District PetroChina Xinjiang Oilfield CompanyKaramay 834000China

This study for the first time demonstrates that some of the so-called clay-sized mudstones observed by the naked eye,such as clay-sized black mudstones and clay-sized oil shales,which are rich in black organic matter(including oil and asphaltene),in the Chang 73 Submember of the Upper Triassic Yanchang Formation in the Ordos Basin of China are actually clay-sized tuffaceous rocks(including tuff,sedimentary tuff and tuffaceous sedimentary rock)with high hydrocarbon generation ***,these rocks can be defined as clay-sized tuffaceous source *** of this lithology has important theoretical and practical significance for the exploration and development of shale oil in the Chang 7 *** the macroscopic observation of drill cores and outcrop profiles,microscopic observation of electron probe thin sections and whole-rock inorganic geochemical analysis(including major,trace and rare earth elements),this work demonstrates that the organic matter-rich clay-sized tuffaceous rocks,especially clay-sized tuffs,have the following ***,the clay-sized tuffaceous rocks with little black organic matter are mainly greyish white,yellowish brown and purplish grey,and mixed colors occur in areas with strong bentonite ***,the clay-sized tuffaceous rocks have experienced strong devitrification and recrystallization,forming abundant flaky aluminosilicate minerals with directional *** thin sections under a polarizing microscope,the interference colors generally show regular alternation between the lowest interference color of first-order yellow and the highest interference color of second-order ***,the rock samples plot in the igneous rock field in the TiO2-SiO2 cross-plot and exhibit similar trace element and rare earth element patterns on spider diagrams,indicating that the samples are derived from the same *** results prove that clay-sized tuffaceous rocks may be widespread in the Chang 73 S

关键词： Ordos Basin Chang 7 Member clay-sized mudstone clay-sized tuffaceous rock lithologic identification

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Found Different Attitude Fracture Characteristics of the NMR Curve by Application of 3D Printing Samples

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Journal of Geoscience and Environment Protection 2017年第7期5卷 223-230页

作者： Minggao Luo Baoxin Chen Maoshu Luo Fenglai Yang Nancy Song Binghui Song College of Earth Science and Technology Southwest Petroleum University Chengdu Sichuan The exploration and Development Research Institute PetroChina Tarim Oilfield Company Korla Xinjiang

Nuclear magnetic resonance (NMR) has many advantages, such as little testing time, no harm to rock specimen, and is widely used in the measurement of reservoir pore structure. 3D printing also has many advantages, such as repeating the printing the same attributes samples, forming sample by known rock pore structure, adding different pores or fractures to sample. For the study of fractured reservoir provides a new train of thought by combining NMR and 3D printing. Nuclear magnetic core analysis is an important work in the study of core, using a T2 spectrum at a certain echo time can also be found in the core fractures. The study, by CT scans to establish reservoir pore structure, based on the basic of adding different attitude fracture forming four fracture characteristics of rock sample, using 3D printing for solid sample, through the analysis of the nuclear magnetic resonance (NMR) of these sample, get the response characteristics of fracture characteristics on the T2 curve, the quantitative calculation of fracture porosity of rock sample, the result accord with to establish the model of fracture porosity is very good. For the study of fractured oil and gas reservoir development the new field.

关键词： 3D Printing Technology Nuclear Magnetic Resonance (NMR) T2 Curve Fracture Porosity

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Insights into moisture content in coals of different ranks by low field nuclear resonance

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能源地球科学(英文) 2020年第3期1卷 93-99页

作者： Yanhui Yang Xiawei Li Yongping Zhang Yonggui Mei Ruixia Ding The CBM exploration and Development Pilot Test Base of CNPC RenqiuHebei062550China exploration and Development Research Institute of Huabei oilfield company RenqiuHebei062550China School of Energy Resources China University of GeosciencesBeijing100083China Sichuan Province Key Laboratory of Shale gas Evaluation and Exploitation ChengduSichuan610091China Sichuan Keyuan Testing Center of Engineering Technology ChengduSichuan610091China Coalbed Methane division of Huabei oilfield company RenqiuHebei062550China

The moisture occurrence in coal reservoirs has important significance in the evaluation of gas-bearing properties and production of coalbed methane(CBM).In order to investigate the occurrence mechanism of moisture content of coals,a series of experiments including mercury intrusion porosimetry(MIP),low temperature nitrogen gas absorption/desorption(N_(2)GA)and nuclear magnetic resonance(NMR)are conducted in this study to characterize and quantify pore structure *** nature of occurrence of moisture content in coal reservoir pores is then divided into four categories by NMR saturation and centrifugation *** bound water content in the adsorption pore accounts for the highest *** on the relevance of bound water content and its influencing factors,moisture occurrence in coal reservoirs of different ranks is revealed by SPSS statistical *** moisture content of low-rank coal is mainly controlled by elemental oxygen and specific surface area,whereas for medium-and high-rank coals,this is controlled mainly by *** study finds application in CBM evaluation and development.

关键词： Pore structure Moisture content Nuclear magnetic resonance Occurrence mechanism

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