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Pore throat structure heterogeneity and its effect on gas-phase seepage capacity in tight sandstone reservoirs:A case study from the Triassic Yanchang Formation,Ordos Basin

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petroleum science 2023年第5期20卷 2892-2907页

作者： Yu-Bin Yang Wen-Lian Xiao Ling-Li Zheng Qi-Hong Lei Chao-Zhong Qin You-An He Shuai-Shuai Liu Min Li Yong-Ming Li Jin-Zhou Zhao Meng Chen National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500SichuanChina Petro China Changqing Oilfield Company Xiʹan710018ShaanxiChina National Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing400044China

The microscopic heterogeneity of pore-throat structures in tight sandstone is a crucial parameter for understanding the transport mechanism of fluid *** this work,we firstly developed the new procedure to characterize the pore size distribution(PSD)and throat size distribution(TSD)by combining the nuclear magnetic resonance(NMR),cast thin section(CTS),and constant-rate mercury injection(CRMI)tests,and used the permeability estimated model to verify the full-scale PSD and ***,we respectively analyzed the fractal feature of the pore and throat,and characterized the heterogeneity of pores and ***,we elaborated the effect of the pore and throat heterogeneity on the gas-phase seepage capacity base on the analysis of the simple capillary tube model and gas-flooding *** results showed that(1)The PSD and TSD of the tight sandstone sample ranged from 0.01 to 10 mm and from 0.1 to 57 mm,respectively,mainly contributed by the micropores and ***,the permeability estimated by the PSD and TSD was consistent with the experimental permeability,and relative error was lower than 8%.(2)The PSD and TSD exhibited multifractal characteristics,and singularity strength range,Δα,could be used as the indicator for characterizing the heterogeneity of pore and ***,the throat of the sample showed stronger heterogeneity than that the pore.(3)The throats played an important role for the fluid transport in the tight sandstone,and the effect of the throat heterogeneity on the gas-phase seepage capacity was different under the lower and higher injection *** macropores and micropores maybe respectively become the preferential migration pathways at the lower and higher injection *** the end,the identification plate was established in our paper,and could be described the relationship among the throat heterogeneity,injection pressure,permeability and flow path of the gas phase in the tight sandstone.

关键词： Tight sandstone Pore size distribution(PSD) Throat size distribution(TSD) Pore and throat heterogeneity Gas-phase flow capacity Nuclear magnetic resonance(NMR) Constant-rate mercury injection(CRMI)

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Anti-drilling ability of Ziliujing conglomerate formation in Western Sichuan Basin of China

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petroleum 2023年第1期9卷 41-52页

作者： Nian Peng Tianshou Ma Gongsheng Zhu Qiang Su State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China Drilling&Production Engineering technology Research Institute CNPC Chuanqing Drilling Engineering Co.Ltd.Guanghan618300China Engineering technology Research Institute PetroChina Southwest Oil&Gas Field CompanyChengdu610052China

The conglomerate rock is usually featured by strong heterogeneity,high abrasiveness,and poor drillability due to its complex composition and texture,which brought a huge challenge for drilling *** order to guide the drill bit selection and high-efficiency drilling,the physical,mechanical,and drillability characteristics were investigated for conglomerate rock that collected from the lower Jurassic Ziliujing formation in the Western Sichuan Basin of *** mineral composition,SEM micro-structure,P-and S-wave velocities,uniaxial and triaxial compressive testing,drillability,abrasiveness were systematically tested and *** mechanical properties and anti-drilling ability of Ziliujing formation were proposed for a typical deep well of S-07,and the distribution characteristics were *** results indicated that the Ziliujing rock is rich-in quartz and clay minerals,due to the co-existing of strong quartz gravel and weak argillaceous cement,the Ziliujing rock shows strong *** relationships are roughly linear among UCS,drillability,and grinding weight loss with P-wave *** Young's modulus,UCS,internal friction angle,drillability,and abrasiveness meet the Weibull distribution pattern,while only the Poisson's ratio meets the Kernel Smooth distribution *** interpretation results reval that the Ziliujing formation has the Young's modulus of 38.61±17.08 GPa,the Poisson's ratio of 0.327±0.006,the internal friction angle of 49.21±11.00°,the drillability of 8.04±1.54,and the abrasiveness grade of 4.32±*** mechanical properties and anti-drilling ability of logging interpretation are in good agreement with the experimental *** Ziliujing formation is a kind of hard rock with strong heterogeneity,high strength,poor drillability,and medium *** on the characteristics of Ziliujing formations,the SV516TAUL PDC bit with non-planar cutters was selected for the field application due to the good abrasion resi

关键词： Conglomerate rock Ziliujing formation Mechanical properties Drillability Drill bit selection

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The ternary combination of polymer gel, microsphere and surfactant for conformance control and oil displacement to improve oil recovery in strong heterogeneous reservoir

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petroleum Research 2023年第2期8卷 151-166页

作者： Siqi Liu Hu Jia Hongshen Wang Yanbin Liang Duansheng Shi Zhichong Lu Junyi Wu State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengduChina CNOOC Energy technology&Services Limited Engineering Technology BranchTianjinChina Oil Production technology Institute of PetroChina Dagang Oilfield Company TianjinChina

The reservoir heterogeneity of Suizhong 36-1 oilfield is very obvious,the average permeability reaches ***-term water injection development leads to serious water channeling in high permeability layers,resulting in ineffective circulation of injected water and reduction of oil *** is urgent to form an effective EOR *** this paper,the oil displacement effect of different combination slugs including polymer gel,polymer microsphere and surfactant is evaluated by means of conformance control and chemical ***-layer heterogeneous 3-D plate model is used for oil displacement *** experimental results show that the combination slug sequentially composed of polymer gel,polymer microspheres and surfactant have the best oil displacement effect with the oil recovery increment by 21.2% after the first water *** addition,using the best slug combination for two rounds flooding,the recovery factor increased by 28.2% compared with the first water *** paper provides some new insights for enhanced oil recovery in strong heterogeneity reservoir.

关键词： Heterogeneity reservoir EOR Polymer gel Microsphere Surfactant Combined slug

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A study on mechanical properties of equal wall thickness rubber bushing of positive displacement motor based on hydrogenated nitrile butadiene rubber aging test

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petroleum 2022年第3期8卷 403-413页

作者： Changshuai Shi Xiaofeng Wan Xiaohua Zhu Kailin Chen Department of Mechatronic Engineering Southwest Petroleum UniversityChengdu610500PR China

Shale gas production has become the main driver of global gas production *** shale gas is difficult to extract,which puts forward higher requirements for drilling speed *** downhole power drilling tools are mainly screw drilling *** screw drill tool stator bushing has poor heat dissipation,which is prone to thermal hysteresis failure,shortening drilling tool life,and is not suitable for high temperature and high pressure environment of deep shale gas *** wall thickness screw drilling tools and hydrogenated nitrile rubber have better high temperature ***,based on the thermal aging experiment and constitutive model of the rubber changes the displacement of the inner cavity of the stator bushing and the difference between the front and the back is up to 21.6%.The increase of the interference and eccentricity between rotor and motor leads to the increase of the maximum von Mises stress of the stator bushing and the thermal hysteresis *** influence of the interference is greater than the influence of the eccentricity so that the interference should be given priority in the *** paper provides a theoretical reference for the design and optimization of equal wall thickness bushing of positive displacement motor.

关键词： PDM HNBR Constitutive model Thermal hysteresis Numerical simulation

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Experimental study of water imbibition characteristics of the lacustrine shale in Sichuan Basin

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petroleum 2023年第4期9卷 572-578页

作者： Changgui Jia Bo Xiao Lijun You Yang Zhou Yili Kang Sinopec Research Institute of petroleum Engineering Beijing102206China State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development Beijing102206China southwest petroleum university Chengdu610500China

Through the stimulation method of large-scale hydraulic fracturing,the spontaneous imbibition capacity of the water phase in the shale reservoir has great influence on the effect of ***,the lacustrine shale has the characteristics of high clay minerals content,strong expansibility,development of nanopores and micro-pores,and underdevelopment of fractures,which leads to the unclear behavior of spontaneous imbibition of aqueous *** lacustrine shale of Da'anzhai Member and marine shale of Longmaxi Formation in Sichuan Basin were selected to prepare both the shale matrix sample and fractured shale sample,and the spontaneous imbibition experiment of simulated formation water was carried *** means of an XRD test,SEM observation,nuclear magnetic resonance test and linear expansion rate test,the mineral composition,the structure of pores and fractures,the capacity of hydration and expansion of both lacustrine and marine shale are compared and *** results show that the average spontaneous imbibition rate of lacustrine shale is 60.8%higher than that of marine shale within the initial 12 hours of *** lacustrine shale has faster imbibition rate than the marine shale in the initial stage of spontaneous ***,the lacustrine shale has underdeveloped pores and fractures,as well as poor connectivity of ***,the strong hydration and expansion of clay minerals can easily lead to dispersion and migration of clay minerals on the fracture surface,which will plug up the seepage channels,resulting in poor capacity of spontaneous *** spontaneous imbibition rate in the middle and late stage of Lacustrine shale is obviously lower than that of the marine *** overall spontaneous imbibition rate ability of the lacustrine shale is less than that of the marine *** to the characteristics of water imbibition of lacustrine shale,considering the dual effects of hydration expansion of clay minerals on the

关键词： Lacustrine shale Marine shale Water imbibition Clay minerals Hydration expansion

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Electrical, mechanical and damage self-sensing properties of basalt fiber reinforced polymer composites modified by electrophoretic deposition

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Progress in Natural science:Materials International 2023年第5期33卷 593-600页

作者： Haoming Sun Dong Xiang Jie Zhang Wei Tan Eileen Harkin-Jones Junjie Wang Menghan Wang Bin Wang Chunxia Zhao Hui Li Zhenyu Li Yuntao Li Yuanpeng Wu School of New Energy and Materials Southwest Petroleum University The Center of Functional Materials for Working Fluids of Oil and Gas Field Sichuan Engineering Technology Research Center of Basalt Fiber Composites Development and Application Southwest Petroleum University Collaborative Scientific innovation Platform of Universities in Sichuan for Basalt Fiber Southwest Petroleum University School of Mechanical Engineering Southwest Petroleum University School of Engineering and Materials science Queen Mary University of London School of Engineering Ulster University Department of Civil Engineering Tsinghua University College of Materials science and Engineering Chongqing University

In this work, basalt fiber reinforced polymer(BFRP) with enhanced electrical, mechanical properties and in-situ damage self-sensing capability was prepared using carboxylic carbon nanotubes(COOH-CNTs) modified BF fabrics via electrophoretic deposition(EPD) at different voltages. The BFRP with BF fabrics modified at a deposition voltage of 20 V(EPD20-BFRP) showed the lowest electrical resistivity. Compared with unmodified BFRP, the tensile and flexual moduli of EPD20-BFRP increased by 37.5 % and 14.9 %, respectively. Single-layer EPD20-BFRP exhibited a high gauge factor(GF) of 44.3 during tensile damage self-sensing. The acoustic emission(AE) signals during tensile and flexual damage process agreed well with the relative resistance changes(RRC),which confirmed different damage stages within loading process, such as elastic deformation, damage evolution,crack coalescence, and complete fracture. In addition, the multi-layer BFRP containing a single-layer EPD20-BFRP on the upper or lower surface of laminate exhibited distinct electrical signal responses subjected to the flexural loading.

关键词： Carbon nanotubes and nanofibers Natural fibers Polymer-matrix composites (PMCs) Non-destructive testing

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Experimental study on the oil production characteristics during the waterflooding of different types of reservoirs in Ordos Basin, NW China

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petroleum Exploration and Development 2021年第4期48卷 935-945页

作者： XIAO Wenlian YANG Yubin LI Min LI Nong YOU Jingxi ZHAO Jinzhou ZHENG Lingli ZHOU Kerning REN Jitian WANG Yue State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500China PetroChina southwest Oil and Gas Field Branch Chengdu 610213China PetroChina Changqing Oilfield Company Xi'an 710018China

Waterflooding experiments were conducted in micro-models(microscopic scale)and on plunger cores from low permeability,extra-low permeability and ultra-low permeability reservoirs in the Ordos Basin under different displacement pressures using the NMR techniques to find out pore-scale oil occurrence state,oil production characteristics and residual oil distribution during the process of waterflooding and analyze the effect of pore structure and displacement pressure on waterflooding *** bound water condition,crude oil mainly occurs in medium and large pores in the low-permeability sample,while small pores and medium pores are the main distribution space of crude oil in extra-low permeability and ultra-low permeability *** the waterflooding,crude oil in the medium and large pores of the three types of samples are preferentially *** the decrease of permeability of the samples,the waterflooding front sequentially shows uniform displacement,network displacement and finger displacement,and correspondingly the oil recovery factors decrease *** waterflooding,the residual oil in low-permeability samples is mainly distributed in medium pores,and appears in membranous and angular dispersed phase;but that in the extra-low and ultra-low permeability samples is mainly distributed in small pores,and appears in continuous phase formed by a bypass flow and dispersed *** low-permeability samples have higher and stable oil displacement efficiency,while the oil displacement efficiency of the extra-low permeability and ultra-low permeability samples is lower,but increases to a certain extent with the increase of displacement pressure.

关键词： waterflooding characteristics oil occurrence state residual oil distribution NMR displacement efficiency Ordos Basin

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Probing the catalytic activity of M-N_(4−x)O_(x) embedded graphene for the oxygen reduction reaction by density functional theory

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Frontiers of Chemical science and Engineering 2021年第5期15卷 1206-1216页

作者： Fan Ge Qingan Qiao Xin Chen You Wu State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China School of Chemistry and Materials science Ludong UniversityYantai264025China Center for Computational Chemistry and Molecular Simulation College of Chemistry and Chemical EngineeringSouthwest Petroleum UniversityChengdu610500China Oil&Gas Field Applied Chemistry Key Laboratory of Sichuan Province College of Chemistry and Chemical EngineeringSouthwest Petroleum UniversityChengdu610500China

In this work,the detailed oxygen reduction reaction(ORR)catalytic performance of M-N_(4−x)O_(x)(M=Fe,Co,and Ni;x=1−4)has been explored via the detailed density functional theory *** results suggest that the formation energy of M-N_(4−x)O_(x)shows a good linear relationship with the number of doped O *** adsorption manner of O_(2)on M-N_(4−x)O_(x)changed from end-on(x=1 and 2)to side-on(x=3 and 4),and the adsorption strength gradually *** on the results for binding strength of ORR intermediates and the Gibbs free energy of ORR steps on the studied catalysts,we screened out two highly active ORR catalysts,namely Co-N_(3)O_(1)and Ni-N_(2)O_(2),which possess very small overpotentials of 0.27 and 0.32 V,*** activities are higher than the precious Pt *** structure analysis reveals one of the reasons for the higher activity of Co-N_(3)O_(1)and Ni-N_(2)O_(2)is that they have small energy gaps and moderate highest occupied molecular orbital energy ***,the results of the density of states reveal that the O doping can improve the electronic structure of the original catalyst to tune the adsorption of the ORR intermediates.

关键词： M-N-C catalyst oxygen doping oxygen reduction reaction catalytic activity density functional theory

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Time history of seismic earth pressure response from gravity retaining wall based on energy dissipation

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Journal of Mountain science 2022年第2期19卷 578-590页

作者： QU Hong-lue DENG Yuan-yuan GAO Ya-nan HUANG Xue ZHANG Zhe School of Geoscience and technology Southwest Petroleum UniversityChengdu 610500China State Key Laboratory for GeoMechanics and Deep Underground Engineering China University of Mining&TechnologyBeijing 100083China China university.of Mining&technology Xuzhou 221116China

The seismic design of gravity retaining walls is based mostly on the pseudo static *** seismic earth pressure is assumed to be a constant without considering the wave traveling effect when the seismic wave propagates through the ***,under continuous ground motion,the actual earth pressure on the retaining wall varies with *** present seismic earth pressure calculation method yields results that differ significantly from the actual *** this,a slip surface curve was assumed in this *** is more suitable for engineering *** addition,a theoretical calculation model based on energy dissipation was *** time history of seismic earth pressure response under continuous ground motion was calculated using the equilibrium equation between the external power and the internal energy dissipation power of the sliding soil *** can more effectively reflect the stress scenario of a retaining wall under seismic *** verify the applicability of the proposed approach,a large-scale shaking table test was conducted,and the time history of the seismic earth pressure response obtained from the experiment was compared with the calculation *** results show that the proposed approach is applicable to the calculation of the time history of seismic earth pressure response of gravity retaining *** lays the foundation for the seismic design of retaining structures by using dynamic time history.

关键词： Energy dissipation Time history of seismic earth pressure response Slip surface curve Gravity retaining wall Shaking table test

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The Influence of Extractable Organic Matter on Pore Development in the Late Triassic Chang 7 Lacustrine Shales, Yanchang Formation, Ordos Basin, China

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Acta Geologica Sinica(English Edition) 2018年第4期92卷 1508-1522页

作者： HAN Hui LIU Pengwei DING Zhengang SHI Pitong JIA Jianchao ZHANG Wei LIU Yan CHEN Shijia LU Jungang Chen Kang PENG Xudong WANG Zhiyong XIAO Shuqi GAO Yuans State Key Laboratory of Oil and Gas Reservoir Geology and Exploration Southwest Petroleum University Chengdu 610500 Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals Shandong University of Science and Technology Qingdao 266590 State Key Laboratory of petroleum Resources & Prospecting China University of Petroleum Beijing 102249 Research Institute of Shaanxi Yanchang petroleum (Group) Co. Ltd. Xi 'ani 710000 Development Business Unit of Huabei Oilfield Company Petro China Renqiu Hebei 062552 Research Institute of petroleum Exploration and Development of Huabei Oilfield Company Petro China Renqiu Hebei 062552 Institute of Mud Logging technology and Engineering Yangtze University Jingzhou Hubei 434023 Beijing Center for Physical and Chemical Analysis Beijing 100089

To investigate the influence of extractable organic matter （EOM） on pore evolution of lacustrine shales, Soxhlet extraction, using dichloromethane, was performed on a series of Chang 7 shale samples （Ordos Basin, China） with vitrinite reflectance of 0.64% to 1.34%. Low-pressure gas adsorption experiments were conducted on the samples before and after extraction. The pore structure parameters were calculated from the gas adsorption data. The results show complex changes to the pore volumes and surface areas after extraction. The pore development of both the initial and extracted samples is strongly controlled by total organic carbon （TOC） content. Micropores developed mainly in organic matter （OM）, while mesopores and macropores predominantly developed in fractions other than OM. The influence of EOM on micropores is stronger than on mesopores and macropores. Organic solvents with a higher boiling point should be used to explore the effect of EOM on pore structure in the future.

关键词： lacustrine shale pore development extraction shale gas Chang 7 Ordos Basin

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