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Implication of Water-Rock Interaction for Enhancing Shale gas Production

Fluid Dynamics & materials Processing 2024年第7期20卷 1441-1462页

作者： Qiuyang Cheng Lijun You Cheng Chang Weiyang Xie Haoran Hu Xingchen Wang Shale gas Research Institute PetroChina Southwest Oil and Gas Field CompanyChengdu610056China Sichuan Province Key Laboratory of Shale gas Evaluation and Exploitation PetroChina Southwest Oil and Gas Field CompanyChengdu610056China State Key Laboratory of oil and gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China

Horizontal well drilling and multi-stage hydraulic fracturing technologies are at the root of commercial shale gas development and *** these processes,typically,a large amount of working fluid enters the formation,resulting in widespread water-rock *** understanding such effects is required to optimize the production *** this study,the mechanisms of water-rock interaction and the associated responses of shale fabric are systematically reviewed for working fluids such as neutral fluids,acid fluids,alkali fluids and oxidative *** is shown that shale is generally rich in water-sensitive components such as clay minerals,acidsensitive components(like carbonate minerals),alkali-sensitive components(like quartz),oxidative-sensitive components(like organic matter and pyrite),which easily lead to change of rock fabric and mechanical properties owing to water-rock *** to the results,oxidizing acid fluids and oxidizing fracturing fluids should be used to enhance shale gas *** study also indicates that an aspect playing an important role in increasing cumulative gas production is the optimization of the maximum shut-in time based on the change point of the wellhead pressure drop *** important influential factor to be considered is the control of the wellhead pressure considering the stress sensitivity and creep characteristics of the fracture network.

关键词： Shale gas reservoir hydraulic fracturing working fluid water-rock interaction oxidation shut-in production system

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Self-healing,Stretchable,Temperature-Sensitive and Strain-Sensitive Hydrogel-based Flexible Sensors

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Chinese Journal of Polymer Science 2023年第3期41卷 334-344,I0005页

作者： Chun-Xia Zhao Min Guo Jie Mao Yun-Tao Li Yuan-Peng Wu Hua Guo Dong Xiang Hui Li School of materials Science and Engineering Southwest Petroleum UniversityChengdu 610500China The center of functional materials for working fluids of oil and gas field Sichuan Engineering Technology Research Center of Basalt Fiber Composites Development and ApplicationSouthwest Petroleum UniversityChengdu 610500China State Key Lab of oil and gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500China

Flexible hydrogels have shown promise as strain sensors in medical monitoring,human motion detection and intelligent *** a hydrogel strain sensor,certain challenges need to be urgently addressed for practical applications,such as the damage caused by external effects,leading to equipment failure,and the inability to perceive ambient temperature,resulting in single ***,a stretchable,self-healing and dual temperature-strain sensitive hydrogel,with a physically-crosslinked network,is designed by constructing multiple dynamic reversible *** oxide(GO)and iron ions(Fe^(3+))act as dynamic bridges in the cross-linked network and are mediated by the covalent and hydrogen bonding,rendering excellent stretchability to the *** reversible features of coordination interactions and hydrogen interactions endow excellent recoverability and self-healing ***,the incorporated N-isopropyl acrylamide(NIPAM)provides excellent temperature responsiveness to the hydrogel,facilitating the detection of external temperature ***,the hydrogels exhibited strain-sensitivity,with a wide working range of 1%-300%,fast response and electrical stability,which can be used as flexible sensors to monitor body motions,e.g.,speaking and the bending of finger,wrist,elbow and ***,the hydrogel possesses dual sensory capabilities,combining external temperature and strain,for potential applications in wearable multifunctional sensing devices.

关键词： Hydrogel sensor Self-healing Dual temperature-strain sensitive Monitor body motions

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Highly stretchable, sensitive and wide linear responsive fabric-based strain sensors with a self-segregated carbon nanotube(CNT)/Polydimethylsiloxane(PDMS) coating

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Progress in Natural Science:materials International 2022年第1期32卷 34-42页

作者： Libing Liu Xuezhong Zhang Dong Xiang Yuanpeng Wu Dan Sun Jiabin Shen Menghan Wang Chunxia Zhao Hui Li Zhenyu Li Ping Wang Yuntao Li School of New Energy and materials Southwest Petroleum University The center of functional materials for working fluids of oil and gas field Southwest Petroleum University School of Mechanical and Aerospace Engineering Queen's University Belfast State Key Laboratory of Polymer materials Engineering Polymer Research Institute of Sichuan University College of materials Science and Engineering Chongqing University

Flexible strain sensors have received increasing attention with the development of wearable electronic ***, integrating wide strain detection range, high sensitivity while maintaining relatively wide linear response range for such sensor system still remain a challenge. A fabric based flexible sensor（S-CNT/PDMS-F） was designed and fabricated, and the sensor can simultaneously achieve high sensitivity, wide linear response and strain detection range by combining self-segregated carbon nanotube（CNT）/polydimethylsiloxane（PDMS）composites and elastic medical bandage. It has been observed that this new sensor system can achieve a high sensitivity with a gauge factor of 615, a large linear responsive range of 0–100% strain（R;= 0.993） and a wide strain detection range of ～ 200%, which is superior to almost all the reported CNT/PDMS flexible strain *** to the similar fabric based strain sensor system deploying non self-segregated structure（C-CNT/PDMSF）, our S-CNT/PDMS-F demonstrates higher electrical conductivity and lower electrical percolation threshold and response time of 55 ms, as well as more stable and repeatable performance under cyclic loading conditions. The capability of the sensors in monitoring physiological activities and weight distribution has also been demonstrated.

关键词： Strain sensor Self-segregated structure Carbon nanotubes Polydimethylsiloxane Nanocomposites

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High-performance fiber strain sensor of carbon nanotube/thermoplastic polyurethane@styrene butadiene styrene with a double percolated structure

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Frontiers of materials Science 2022年第1期16卷 99-110页

作者： Dong XIANG Libing LIU Xiaoyu CHEN Yuanpeng WU Menghan WANG Jie ZHANG Chunxia ZHAO Hui LI Zhenyu LI Ping WANG Yuntao LI School of New Energy and materials Southwest Petroleum UniversityChengdu 610500China State Key Laboratory of oil and gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500China College of materials Science and Engineering Chongqing UniversityChongqing 400030China School of Mechatronic Engineering Southwest Petroleum UniversityChengdu 610500China The center of functional materials for working fluids of oil and gas field Southwest Petroleum UniversityChengdu 610500China

In this work,a high-performance fiber strain sensor is fabricated by constructing a double percolated structure,consisting of carbon nanotube(CNT)/thermoplastic polyurethane(TPU)continuous phase and styrene butadiene styrene(SBS)phase,incompatible with TPU(CNT/TPU@SBS).Compared with other similar fiber strain sensor systems without double percolated structure,the CNT/TPU@SBS sensor achieves a lower percolation threshold(0.38 wt.%)and higher electrical *** conductivity of 1%-CNT/TPU@SBS(4.12×10^(-3) S·m^(-1))is two orders of magnitude higher than that of 1%-CNT/TPU(3.17×10^(-5) S·m^(-1))at the same CNT loading of 1 wt.%.Due to double percolated structure,the 1%-CNT/TPU@SBS sensor exhibits a wide strain detection range(0.2%-100%)and an ultra-high sensitivity(maximum gauge factor(GF)is 32411 at 100%strain).Besides,the 1%-CNT/TPU@SBS sensor shows a high linearity(R^(2)=0.97)at 0%-20%strain,relatively fast response time(214 ms),and stability(500 loading/unloading cycles).The designed sensor can efficiently monitor physiological signals and movements and identify load distribution after being woven into a sensor array,showing broad application prospects in wearable electronics.

关键词： double percolated structure strain sensor fiber carbon nanotube nanocomposite

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Design and Preparation of Graphene/Fe_(2)O_(3) Nanocomposite as Negative Material for Supercapacitor

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Chemical Research in Chinese Universities 2022年第4期38卷 1097-1104页

作者： GAO Wei LI Yufeng ZHAO Jitao ZHANG Zhe TANG Weiwei WANG Jun WU Zhenyu LI Zhenyu School of Biology and Chemistry Engineering Panzhihua UniversityPanzhihua617000P.R.China center of functional materials for working fluids of oil and gas field School of New Energy and MaterialsSouthwest Petroleum UniversityChengdu610500P.R.China College of materials Science and Engineering Heilongjiang University of Science and TechnologyHarbin150022P.R.China

The development of high specific capacitance electrode materials with high efficiency,scalability and economic feasibility is significant for the application of supercapacitors,however,the synthesis of electrode material still faces huge ***,graphene(G)/Fe_(2)O_(3) nanocomposite was prepared via a simple hydrothermal method connected with subsequent thermal reduction *** electron microscopy(SEM)and transmission electron microscopy(TEM)results showed rod-like Fe_(2)O_(3) nanoparticles were prepared and well-dispersed on graphene layers,providing a rich active site and effectively buffering the aggregation of Fe_(2)O_(3) nanoparticles in the process of electrochemical *** specific capacitance of the obtained G/Fe_(2)O_(3) nanocomposite as negative electrode for supercapacitor was 378.7 F/g at the current density of 1.5 A/g,and the specific capacitance retention was 88.76%after 3000 ***,the asymmetric supercapacitor(ASC)was fabricated with G/Fe_(2)O_(3) nanocomposite as negative electrode,graphene as positive electrode,which achieved a high energy density of 64.09 W·h/kg at a power density of 800.01 W/kg,maintained 30.07 W·h/kg at a power density of 8004.89 W/kg,and retained its initial capacitance by 78.04%after 3000 *** excellent result offered a promising way for the G/Fe_(2)O_(3) nanocomposite to be applied in high energy density storage systems.

关键词： Graphene Fe_(2)O_(3) Electrode material Supercapacitor

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Partial P-Type Metal Ions Doping Induced Variation of Both Crystal Structure and Oxygen Vacancy Within Cu/SnO_(2) Metastable Solid Solution Nanofibers for Highly Sensitive C_(2)H_(2) Sensor

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Chemical Research in Chinese Universities 2021年第3期37卷 584-588页

作者： WANG Ruifang YU Xi LI Zhenyu CHEN Jingyu JIANG Tingting State Key Laboratory of oil and gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500P.R.China center of functional materials for working fluids of oil and gas field School of New Energy and MaterialsSouthwest Petroleum UniversityChengdu610500P.R.China School of Engineering Southwest Petroleum UniversityNanchong637001P.R.China School of Chemical Engineering Northeast Electric Power UniversityJilin132012P.R.China

Partial P-type metal ions doping(PPMID)is an alternative method to further enhance the gas sensing performance of N-type metal oxides(NMOs)in contrast to that of P-N metal oxides heterojunctions,but the influences of the introduction of PPMID on the grain size and oxygen vacancies of NMOs have been rarely ***,a simple and effective route has been demonstrated to address this problem with Cu^(2+)-doped SnO_(2) metastable solid solution nanofibers(CSMSSNs)as model and C_(2)H_(2) as target molecule by combining electrospinning and calcination *** seems that the introduction of PPMID can also affect crystal structure and oxygen vacancies of NMOs,proven by combining X-ray diffraction(XRD)and X-ray photoelectron spectra(XPS).Thus,PPD,crystal structure and oxygen vacancies have been combined to clarify the enhanced sensing performance of Cu-doped SnO_(2) metastable solid solution nanofibers angainst C_(2)H_(2).

关键词： P-Type doping P-N heterojunction Electrospinning Metastable solid solution nanofiber C_(2)H_(2)sensor

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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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N-Doped Carbon Nanofibrous Film with Unique Wettability,Enhanced Supercapacitive Property,and Facile Capacity to Demulsify Surfactant Free oil-in-water Emulsions

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Chemical Research in Chinese Universities 2021年第3期37卷 436-442页

作者： WANG Ruifang LEI Weiwei WANG Lei LI Zhenyu CHEN Jingyu HU Zhenzhong State Key Laboratory of oil and gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500P.R.China center of functional materials for working fluids of oil and gas field School of New Energy and MaterialsSouthwest Petroleum UniversityChengdu610500P.R.China Institute for Frontier materials Deakin UniversityGeelong/MelbourneAustralia Chengdu Evermaterials Co. Ltd.Chengdu610500P.R.China Tianjin Key Laboratory of Clean Energy and Pollutant Control School of Energy and Environmental EngineeringHebei University of TechnologyTianjin300401P.R.China

Electrospinning and calcination technique have been combined to fabricate N-doped carbon nanofibers(N-CNFs)by introducing amino grafted few-layered hexagonal boron nitride(amino@BN)into polyacrylonitrile(PAN)matrix as filler followed by *** the high N-doping level(10.7%,atomic fraction)with the final product,the as-prepared N-CNFs exhibit interesting surface wettability(superamphiphilicity in air and underwater oleophilicity).Moreover,compared with pristine PAN derived carbon nanofibers(marked as CNFs),N-CNFs exhibit higher graphic structure under fixed carbonizing temperature as *** these advantages aforementioned,the as-prepared N-CNFs exhibit good specific capacitance(ca.200.1 F/g)without activation treatment at the current density of 0.5 A/g in three-electrode configuration,which is about 149%that of CNFs(ca.134 F/g).What’s more,our N-CNFs also display the unexpected capacity to demulsify diverse surfactant free oil-in-water emulsions by simple filtration in large scale with the high water flux ca.(23578±150)L·m^(−2)·h^(−1).

关键词： Carbon nanofibrous membrane Unique wettability Supercapacitor Demulsification of oil-water emulsion

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Abnormal high pressure in Kuqa foreland thrust belt of Tarim basin: Origin and impacts on hydrocarbon accumulation

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Progress in Natural Science:materials International 2006年第12期16卷 1307-1314页

作者： ZENG Lianbo~1** and LIU Benming~ 1,2 (1. Key Laboratory of Hydrocarbon Accumulation in China Petroleum University, Ministry of Education, Beijing 102249, China 2. The Institute of oil and gas Exploration and Development, Tarim oilfield Company, PetroChina Company Limited, Korla 841000, China) Key Laboratory of Hydrocarbon Accumulation in China Petroleum University Ministry of Education Beijing 102249 China. Institute of oil and gas Exploration and Development Tarim Oilfield Company PetroChina Company Limited Korla 841000 China

Following analyses of the abnormal high pressure distribution characteristics, based on the geological characteristics, tectonic stress field and physical simulation, we investigated the formation mechanisms of abnormal high pressure and its impacts on hydrocarbon accumulation in the Kuqa foreland thrust belt. The abnormal high pressure appears at the bottom of the Paleogene and obviously exists in the Triassic and Jurassic. However, the pressure coefficient in the Triassic and Jurassic is lower than that in the Cretaceous and at the bottom of the Paleogene. Horizontally, the abnormal high pressure distribution is characterized by E-W orientation zoning. The maximum pressure coefficient lies in the Kelasu-Dongqiu-Dina tectonic zones in the center of the Kuqa foreland thrust belt and decreases away from the tectonic zones. The formation of abnormal high pressure was mainly related with the intense tectonic compression in the Early Pleistocene time, and tectonic uplifting, undercompaction and hydrocarbon generation were secondary factors contributing to abnormal high pressure. Under the rapid and intense tectonic compression in the Early Pleistocene, the rock framework firstly undertook 1/4 of the compression stress and the other was borne by the pore fluids. Due to the presence of great seal of gypsum-salt or gypsum-mudstone beds in the Paleogene, the pressure of pore fluids increased rapidly and led to the abnormal high pressure in the Kuqa foreland thrust belt. The abnormal high pressure has important impacts on hydrocarbon accumulation. It is one of the necessary conditions for formation of large oil and gas fields in the Kuqa foreland thrust belt.

关键词： abnormal high pressure formation mechanism oil and gas reservoir Kuqa foreland thrust belt Tarim basin.

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Lignosulfonate and Its Derivatives for oil-well Drilling:A Concise Review

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Paper And Biomaterials 2021年第2期6卷 59-68页

作者： Ping He Lei Dai Xinyu Li Zongjian Yang Feiguo Hua Liang Li Bing Wei College of Bioresources Chemical and materials Engineering National Demonstration Center for Experimental Light Chemistry Engineering EducationShaanxi University of Science and TechnologyXi'anShaaxi Province710021China Sinopec Northwest oil field Branch Sinopec GroupUrumqiXinjiang Uygur Autonomous Region830011China College of Chemical and Biological Engineering Zhejiang UniversityHangzhouZhejiang Province310027China Zhejiang Jinjiahao Green Nanomaterial Co. Ltd.LongyouZhejiang Province324404China State Key Laboratory of oil and gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengduSichuan Province610500China

Lignosulfonate,a byproduct of the pulp and paper industry,has been used in the oil-well drilling industry for a significant amount of *** and its derivatives serve different roles in the oil-well drilling industry because of their unique structures and *** review summarizes lignosulfonate and its derivatives,including lignosulfonate complexed with metal ions,lignosulfonate graft copolymers,lignosulfonatetannin complexes,and other lignosulfonate-containing composites,in terms of their preparation,properties,and potential applications in oil-well drilling *** provides readers with a quick review of existing studies in this area and some inspirations for future studies pertaining to the utilization of lignosulfonate-based materials in the oil-well drilling industry.

关键词： lignosulfonate oil-well drilling fluids oil-well cementing

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