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The Major Controlling Factors and Different Oolitic Shoal Reservoir Characteristics of the Triassic Feixianguan Formation,Eastern Longgang Area,NE Sichuan Basin,SW China

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Acta Geologica Sinica(English Edition) 2021年第3期95卷 895-908页

作者： GU Yifan JIANG Yuqiang LEI Xiaohua CHEN Zhiyong ZHOU Lu FU Yonghong JIANG Zengzheng School of Geoscience and Technology Southwest Petroleum UniversityChengdu 610500China Department of Geology University of ReginaReginaSaskatchewanSK S4S 0A2Canada Northeastern Sichuan oil and gas District PetroChina Southwest Oil and Gas Field CompanyDazhouSichuan 635000China Chongqing gas Field PetroChina Southwest Oil and Gas Field CompanyChongqing 400021China Sichuan Geotech Science and Technology Ltd. Chengdu 610041China

Based on comprehensive analyses of occurrence,petrological observation,pore structure and geochemistry,the different reservoir characteristics and reservoir evolutionary pathways between different oolitic shoal reservoir types of the Feixianguan Formation on the west side of the Kaijiang-Liangping Trough have been *** exist three stages of high-energy slope break belts in the Feixianguan period,the corresponding three stages of oolitic shoals gradually migrating in the direction of the *** types of oolitic shoal reservoirs,namely,residual-oolitic dolomite,mold-oolitic dolomite and sparry oolitic limestone,were formed during sedimentary-diagenetic evolution,the pore types being intergranular dissolved pore,mold pore(or intragranular dissolved pore)and residual intergranular pore,*** petrology,physical properties and pore structure of the different types of oolitic shoal reservoirs are quite ***-oolitic dolomite reservoirs have the best quality,while sparry oolitic limestone reservoirs have the *** with analyses of trace elements,rare earth elements and carbon-oxygen isotopes,it is suggested that the formation of residual-oolitic dolomite reservoirs is jointly controlled by penesaline seawater seepage-reflux dolomitization and hydrothermal ***-pore oolitic dolomite reservoirs are controlled by penesaline seawater seepage-reflux dolomitization and meteoric water *** burial dissolution of organic acid not only further improves the reservoir qualities of previously formed oolitic dolomite reservoirs,but also preserves residual intergranular pores in the sparry oolitic limestone reservoirs.

关键词： oolitic shoal reservoir evolution geochemical characteristics Triassic System Feixianguan Formation Sichuan Basin

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Comparison of basic features and origins of oolitic shoal reservoirs between carbonate platform interior and platform margin locations in the Lower Triassic Feixianguan Formation of the Sichuan Basin,southwest China

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Petroleum Science 2012年第4期9卷 417-428页

作者： Tan Xiucheng Zhao Luzi Luo Bing Jiang Xingfu Cao Jian Liu Hong Li Ling Wu Xingbo Nie Yong State Key Laboratory of oil and gas Geology and Exploitation Southwest Petroleum University Chengdu Sichuan610500 China School of Resource and Environment Southwest Petroleum University Chengdu Sichuan 610500 China Branch of Exploration Management PetroChina Southwest Oil and Gas Field Company Chengdu Sichuan 610051 China Branch Station in Research Institute of Petroleum Exploration and Development Post-doctoral Workstation of PetroChinaSouthwest Oil and Gas Field Company Chengdu Sichuan 610051 China Branch of Exploration Industry PetroChina Southwest Oil and Gas Field Company Chengdu Sichuan 610051 China Department of Earth Sciences Nanjing University Jiangsu 210093 China

The oolitic shoal reservoirs of the Lower Triassic Feixianguan Formation carbonates in the Sichuan Basin of southwest China are an important target for gas exploration in the *** occurrence,like other cases worldwide,can be divided into two locations in general,i.e.,platform interior and platform margin *** differences of reservoir features and origins,however,have not been investigated comprehensively due to different exploration *** issue is addressed in this paper,to provide basic data and information for the basin＇s hydrocarbon exploration and for the study of carbonate platform sedimentology and reservoir geology *** compared the features of these two types of reservoirs in detail,including the depositional and diagenetic features,pore types and petrophysical *** on the comparison,the origin of the reservoirs was further *** is shown that the reservoirs in platform interior and platform margin locations differ *** interior carbonates were deposited in moderate to high energy settings and the dominant lithologic type was limestone,which was weakly compacted and intensely cemented and has undergone meteoric *** types include intragranular dissolution and moldic pores,with low porosities（6%） and low permeabilities（0.1 mD）.By contrast,the platform margin carbonates were deposited in relatively high energy settings and mainly consisted of dolostones with some *** rocks were strongly compacted but incompletely *** a result,some primary intergranular pores were *** meteoric solution and burial solution have taken *** are various types of pore spaces including intergranular and intercrystalline solution pores and residual intergranular *** type of reservoir generally has better petrophysical properties（9% porosity and 0.1 mD permeability） and pore-throat structures than the interior *** differences were influenced by both primar

关键词： Carbonate platform oolitic shoal reservoir platform margin platform interior Lower Triassic Feixianguan Formation Sichuan Basin China

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Failure mechanism and influencing factors of cement sheath integrity under alternating pressure

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Petroleum Science 2023年第4期20卷 2413-2427页

作者： Kuan-Hai Deng Nian-Tao Zhou Yuan-Hua Lin Yan-Xian Wu Jie Chen Chang Shu Peng-Fei Xie State Key Laboratory of oil and gas Reservoir Geology and Exploitation(Southwest Petroleum University) ChengduSichuan610500China Engineering Technology Research Institute PetroChina Xinjiang Oilfield CompanyKaramayXinjiang834000China CNPC Xibu Drilling Engineering company Limited UrumqiXinjiang830000China Engineering Technology Research Institute PetroChina Southwest Oil&Gas Field CompanyChengduSichuan610066China

The failure of cement sheath integrity can be easily caused by alternating pressure during large-scale multistage hydraulic fracturing in shale-gas *** elastic-plastic mechanical model of casing-cement sheath-formation(CSF)system under alternating pressure is established based on the Mohr-Coulomb criterion and thick-walled cylinder theory,and it has been solved by MATLAB programming combining global optimization algorithm with Global *** failure mechanism of cement sheath integrity is investigated,by which it can be seen that the formation of interface debonding is mainly related to the plastic strain accumulation,and there is a risk of interface debonding under alternating pressure,once the cement sheath enters plasticity whether in shallow or deep well *** matching relationship between the mechanical parameters(elastic modulus and Poisson's ratio)of cement sheath and its integrity failure under alternating pressure in whole well sections is studied,by which it has been found there is a“critical range”in the Poisson's ratio of cement *** the Poisson's ratio is below the“critical range”,there is a positive correlation between the yield internal pressure of cement sheath(SYP)and its elastic ***,when the Poisson's ratio is above the“critical range”,there is a negative *** elastic modulus of cement sheath is closely related to its Poisson's ratio,and restricts each *** and reasonable matching between mechanical parameters of cement sheath and CSF system under different working conditions can not only reduce the cost,but also protect the cement sheath integrity.

关键词： Casing-cement sheath-formation system Mechanical model Matching relationship Cement sheath integrity Critical range Mechanical parameters

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Integrated asset management:a case study of technical and economic optimization of surface and well facilities

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Petroleum Science 2019年第5期16卷 1221-1236页

作者： Arman Darvish Sarvestani Ali Moazami Goodarzi Ali Hadipour oil&gas Reservoir Engineering Department Tarh-o-Palayesh Engineering CompanyTehranIran Process and Mechanical Group Tarh-o-Palayesh Engineering CompanyTehranIran

oil production could be increased by using optimization techniques in each stage of oil production system from field to production ***,the maximum profit will be obtained once integrated optimization of surface and subsurface components of the oil production system is *** addition,when using high-tech equipment and facilities,an integrated study of well and surface facilities affects the economic benefits *** this work,one of the Iranian brown fields(mature or declining production fields)was studied to find the best renovation plan with maximum *** base scenario was designed with four stages of separation,and the high-pressure gases from the first and the second separator were planned to be sold,while the low-pressure gases from subsequent stages were supposed to be *** this paper,two additional scenarios,namely separator optimization and full optimization,were proposed and 12 cases were *** the full optimization scenario,low-pressure gases were prevented from being *** was observed that by stopping the flaring systems,gas production rate increases as high as 20%and 150 to 200 MW power will be generated in all cases during the next 20 ***,economic evaluation for all of the cases was done and different cases were compared in terms of incremental annual worth and payback period.

关键词： Separator Electricity gas lift Flare NPV Optimization

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A phase-field model for simulating the propagation behavior of mixed-mode cracks during the hydraulic fracturing process in fractured reservoirs

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Applied Mathematics and Mechanics(English Edition) 2024年第5期45卷 911-930页

作者： Dan ZHANG Liangping YI Zhaozhong YANG Jingqiang ZHANG Gang CHEN Ruoyu YANG Xiaogang LI State Key Laboratory of oil and gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500China State Key Laboratory of oil and gas Reservoir Geology and Exploitation Chengdu University of TechnologyChengdu 610059China Tarim oilfield company PetroChinaBayingolin Mongolian Autonomous Prefecture 841000Xinjiang Uygur Autonomous RegionChina Wuqi oil Production Plant Shaanxi Yanchang PetroleumXi'an 716000China Exploration Division of PetroChina Southwest oil and gasfield company Chengdu 610041China

A novel phase-field model for the propagation of mixed-mode hydraulic fractures,characterized by the formation of mixed-mode fractures due to the interactions between fluids and solids,is *** this model,the driving force for the phase field consists of both tensile and shear components,with the fluid contribution primarily manifesting in the tension driving *** displacement and pressure are solved simultaneously by an implicit *** numerical solution's iterative format is established by the finite element discretization and Newton-Raphson(NR)iterative *** correctness of the model is verified through the uniaxial compression physical experiments on fluid-pressurized rocks,and the limitations of the hydraulic fracture expansion phase-field model,which only considers mode I fractures,are *** addition,the influence of matrix mode II fracture toughness value,natural fracture mode II toughness value,and fracturing fluid injection rate on the hydraulic fracture propagation in porous media with natural fractures is studied.

关键词： mixed-mode crack hydraulic fracturing poro-elasticity phase-field method(PFM)

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Environmental Risk Assessment for Exploration and Extraction Processes of Unconventional Hydrocarbon Deposits of Shale gas and Tight gas:Pomeranian and Carpathian Region Case Study as Largest Onshore oilfields

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Journal of Earth Science 2020年第1期31卷 215-222页

作者： Monika Wojcik Wojciech Kostowski Polish oil and gas company Warszawa 01-224Poland Silesian University of Technology Institute of Thermal TechnologyGliwice 44-100Poland

Shale gas and tight gas exploration and extraction processes create potential threats to the *** Poland,no comprehensive guidelines for environmental risk assessment have been prepared so *** paper presents a proposal of environmental risk assessment methodology which can be used for corporate risk management procedures during exploration and extraction of unconventional hydrocarbons in *** most frequent environmental threats that may occur during the exploration and exploitation of unconventional hydrocarbon deposits include degradation of soils through construction of drilling rigs and access roads,landforms change,local soil pollution caused by fuels,cleaning agents and materials used to prepare drilling fluids,rubble,cement,gravel,pollution of surface and underground water as a result of emergency discharges of sewage,infiltration of pollution from waste reservoirs,disturbance of hydrogeological equilibrium through significant water intake,noise and atmospheric pollution resulting from the combustion of *** check the level of these threats' six exploration sites form Pomeranian and Carpathian region of Poland(3 wells of shale gas and 3 wells of tight gas) have been evaluated in detail,and the risk quantification has been *** of a local,short-term and reversible environment impact,the environmental risks for the exploration and extraction processes of unconventional hydrocarbons have been found to be medium or negligibly *** is recommended that using the same methodology for other regions of Poland where we can find unconventional hydrocarbons and it can be enriched in dedicated application with spatial maps to give the investors a quick feedback on the potential environmental risks.

关键词： environmental risk assessment sustainable development shale gas tight gas drilling rig environment pollution

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Theoretical Progress and Key Technologies of Onshore Ultra-Deep oil/gas Exploration

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Engineering 2019年第3期5卷 458-470页

作者： Xusheng Guo Dongfeng Hu Yuping Li Jinbao Duan Xuefeng Zhang Xiaojun Fan Hua Duan Wencheng Li SINOPEC Exploration company Chengdu 610041 China Institute of oil and gas School of Earth and Space Sciences Peking University Beijing 100871 China

oil/gas exploration around the world has extended into deep and ultra-deep strata because it is increasingly difficult to find new large-scale oil/gas reservoirs in shallow–middle buried strata. In recent years, China has made remarkable achievements in oil/gas exploration in ultra-deep areas including carbonate and clastic reservoirs. Some (ultra) large-scale oil and gas fields have been discovered. The oil/gas accumulation mechanisms and key technologies of oil/gas reservoir exploration and development are summarized in this study in order to share China’s experiences. Ultra-deep oil/gas originates from numerous sources of hydrocarbons and multiphase charging. Liquid hydrocarbons can form in ultradeep layers due to low geothermal gradients or overpressures, and the natural gas composition in ultra-deep areas is complicated by the reactions between deep hydrocarbons, water, and rock or by the addition of mantle- or crust-sourced gases. These oils/gases are mainly stored in the original highenergy reef/shoal complexes or in sand body sediments. They usually have high original porosity. Secondary pores are often developed by dissolution, dolomitization, and fracturing in the late stage. The early pores have been preserved by retentive diageneses such as the early charging of hydrocarbons. oil/gas accumulation in ultra-deep areas generally has the characteristics of near-source accumulation and sustained preservation. The effective exploration and development of ultra-deep oil/gas reservoirs depend on the support of key technologies. Use of the latest technologies such as seismic signal acquisition and processing, low porosity and permeability zone prediction, and gas–water identification has enabled the discovery of ultra-deep oil/gas resources. In addition, advanced technologies for drilling, completion, and oil/gas testing have ensured the effective development of these fields.

关键词： oil/gas exploration Ultra-deep sources Reservoir Petroleum accumulation Exploration and exploitation technologies

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Effect of quenching-partitioning treatment on the microstructure, mechanical and abrasive properties of high carbon steel

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International Journal of Minerals,Metallurgy and Materials 2021年第4期28卷 676-687页

作者： Jian-ping Lai Jia-xin Yu Jiong Wang Key Laboratory of Testing Technology for Manufacturing Process in Ministry of Education Mianyang 621010China School of Manufacturing Science and Engineering Southwest University of Science and TechnologyMianyang 621010China Central Sichuan oil-gas District Petro-China Southwest Oil and Gas Field CompanySuining 629000China

The present work employed the X-ray diffraction, scanning electron microscopy, electron backscattered diffraction, and electron probe microanalysis techniques to identify the microstructural evolution and mechanical and abrasive behavior of high carbon steel during quenching-partitioning treatment with an aim to enhance the toughness and wear resistance of high carbon *** showed that, with the increase in partitioning temperature from 250 to 400℃, the amount of retained austenite(RA) decreased resulting from the carbide precipitation effect after longer partitioning ***, the stability of RA generally increased because of the enhanced degree of carbon enrichment in *** the factors affecting the toughness of high carbon steel, the stability of RA associated with size, carbon content, and morphology plays a significant role in determining the toughness of high carbon *** analysis of the wear resistance of samples with different mechanical properties shows that hardness is the primary factor affecting the wear resistance of high carbon steel, and the toughness is the secondary one.

关键词： high carbon steel quenching and partitioning microstructural evolution retained austenite

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Supply-based optimal scheduling of oil product pipelines

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Petroleum Science 2016年第2期13卷 355-367页

作者： Hao-Ran Zhang Yong-Tu Liang Qiao Xiao Meng-Yu Wu Qi Shao Beijing Key Laboratory of Urban oil and gas Distribution Technology China University of Petroleum Beijing 102249China CNPC Trans-Asia gas Pipeline company Ltd. Beijing 100007 China

oil product pipelines have features such as transporting multiple materials, ever-changing operating conditions, and synchronism between the oil input plan and the oil offloading plan. In this paper, an optimal model was established for a single-source multi-distribution oil pro- duct pipeline, and scheduling plans were made based on supply. In the model, time node constraints, oil offloading plan constraints, and migration of batch constraints were taken into consideration. The minimum deviation between the demanded oil volumes and the actual offloading volumes was chosen as the objective function, and a linear programming model was established on the basis of known time nodes＇ sequence. The ant colony optimization algo- rithm and simplex method were used to solve the model. The model was applied to a real pipeline and it performed well.

关键词： oil products pipeline Schedulingoptimization Linear programming (LP) modelAnt colony optimization algorithm (ACO) Simplex method (SM)

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General criterion for intersection between hydraulic induced fractures and pre-existing natural fractures

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Petroleum 2019年第3期5卷 315-320页

作者： Zhifeng Luo Nanlin Zhang Liqiang Zhao Fei Liu Nianyin Li State Key Laboratory of oil&gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China Engineering Technology Research Institute of Southwest oil&gas Field company PetroChinaGuanghan618300China

Pre-existing natural fractures and other structurally weak planes are usually well-developed in unconventional *** such fractures intersect with hydraulic induced fractures,they will redirect and propagate as an important mechanical principle of volume fracturing by the formation of complex fracture *** the shadow effect of natural fractures and other structurally weak planes with hydraulic supported fracture stress,hydraulic fractures do not fully propagate in the direction of the maximum *** paper computed the stress intensity factors of hydraulic fracture types I and II by integrating the various interactions,established universally-applicable mechanical principles for the propagation behavior when a hydraulic fracture propagating in an arbitrary direction intersects with a natural fracture at an arbitrary angle,and demonstrated the mechanical principles of the intersection between hydraulic induced fractures and pre-existing natural *** study proved the following conclusions:as the intersection angle between the hydraulic fracture and the maximum horizontal-principal-stress increased,the possibility of the hydraulic fracture being captured by the natural fracture with an identical approaching angle first increased and then decreased;as the net stress increased,the intersection behavior between the hydraulic fracture and the natural fracture transitioned from penetration to capture.

关键词： Hydraulic induced fracture Pre-existing natural fracture Intersection criterion Stress intensity factor Extended finite element method

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