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Petroleum Research 2024年第1期9卷 37-47页

作者： Dongsheng Xiao Xiong fei Xu Jilun Kang Yiting Zhang petrochina Tuha oilfield co.pany Exploration and Development Research Institute China

Lucaogou Formation in the Santanghu Basin is a special lacustrine fine-grained sedimentary deposits rich in volcanic debris and carbonate,with abundant shale oil ***,understanding of shale oil characteristics and genesis remains ***,sedimentary environment,and formation mechanisms of tuffaceous shale oil are investigated based on co.e and thin section observations,X-ray diffraction,field emission SEM and geochemical *** show that three mixed lithofacies types are developed in Lucaogou Formation:blocky tuff,laminated tuffaceous dolomite,and laminated dolomitic *** lithofacies types are characterized by high co.tent of felsic and dolostone,widespread organic matter,and low clay *** of tuffaceous shale oil sweet spots is primarily influenced by four factors:inputting of volcanic ash as a high-quality source rocks and reservoirs provides good material basis;devitrification of volcanic glass,calcitization,and dissolution are crucial for formation of reservoirs;expulsion of source rocks with high-abundance organic matter expulsion facilitates migration and accumulation of hydrocarbon in adjacent reservoirs;fracture development improves reservoir permeability to form highly productive sweet *** analyzing characteristics and genesis of tuffaceous shale oil,the main co.trolling factors of reservoir physical property and oil saturation are clarified,which is of great significance for selection of shale oil exploration zones.

关键词： shale oil Tuffaceous Formation mechanism Lucaogou formation Santanghu basin

Differences in and factors co.trolling organic matter enrichment in the Ziliujing Formation shale in the Sichuan Basin

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Petroleum Science 2024年第1期21卷 77-86页

作者： Peng Li Zhong-Bao Liu He Bi Tao Jiang Rui-Kang Bian Peng-Wei Wang Xiao-Yu Shang State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Efficient Development Beijing102206China Key Laboratory of Shale Oil/Gas Exploration and Production Technology SINOPECBeijing102206China Petroleum Exploration and Production Research Institute SINOPECBeijing102206China Research Institute of Petroleum Exploration and Development PetroChinaBeijing100083China Chinese Academy of Geological Sciences Beijing100037China No.4 Oil Production Plant in daqing oilfield co.ltd. Daqing163511HeilongjiangChina

Lacustrine shale oil and gas are important fields for unco.ventional exploration and development in China,and organic-rich shale deposition lays down the critical foundation for hydrocarbon *** are two sets of shale,the Dongyuemiao and Da’anzhai Members,in the Ziliujing Formation in the Sichuan *** identify the differential enrichment characteristics of organic matter and clarify its co.trolling factors,geochemical analyses of organic and inorganic geochemical analyses were *** results showed that the total organic carbon co.tent of the Dongyuemiao shale(1.36%)is slightly higher than that of the Da’anzhai shale(0.95%).The enrichment of organic matter in the two shales resulted from the co.prehensive co.trols of paleoproductivity,paleoenvironment,and terrigenous input,but different factors have different *** addition,driven by climate,the change in the sulfate co.centration in the bottom water further led to the different intensities of bacterial sulfate reduction in early *** made a great difference regarding organic matter accumulation in the two *** general,climate may have played a dominant role in organic matter enrichment in the two sets of shale.

关键词： Lacustrine shale Ziliujing Formation Sichuan Basin Enrichment mechanism of organic matter

Evaluation of the injection and plugging ability of a novel epoxy resin in cement cracks

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Petroleum Science 2024年第2期21卷 1211-1220页

作者： Guang-Yao Leng Wei Yan Hai-Mu Ye Er-Dong Yao Ji-Bin Duan Zheng-Xian Xu Ke-Pei Li Jing-Ru Zhang Zhong Li State Key Laboratory of Petroleum Resource&Prospecting China University of Petroleum(Beijing)Beijing102249China CNPC Liaohe oilfield Gas Storage co.ltd Panjin124000LiaoningChina CNOOC Research Institute co. Ltd.Beijing100028China

Sustained casing pressure(SCP)is a crucial issue in the oil and gas production *** resins,exhibiting exceptional co.pressive strength,ductility,and shear bonding strength,have the potential to form reliable *** injectivity and sealing capacity of the epoxy resin is crucial parameters for the success of shallow remediation *** study aimed to develop and assess a novel solid-free resin sealant as an alternative to Portland cement for mitigating fluid *** investigation evaluated the visco.ity,co.pressive strength,and brittleness index of the epoxy resin sealant,as well as its tangential and normal shear strengths in co.junction with casing *** flow characteristics and sealing abilities of co.ventional cement and epoxy resin were co.paratively analyzed in *** results showed that the application of a visco.ity reducer facilitated co.trol over the curing time of the epoxy resin,ranging from 1.5 to 6 h,and reduced the initial visco.ity from 865.53 to 118.71 m Pa,*** mechanical properties of the epoxy resin initially increased with a rise in curing agent co.tent before experiencing a minor *** epoxy resin co.taining 30%curing agent exhibited optimal mechanical *** a 14-day curing period,the epoxy resin's co.pressive strength reached81.37 MPa,2.12 times higher than that of cement,whereas the elastic modulus of cement was 2.99 times greater than that of the epoxy *** brittleness index of epoxy resin is only 3.42,demonstrating high flexibility and *** tangential and normal shear strengths of the epoxy resin exceeded those of cement by 3.17 and 2.82 times,*** a 0.5 mm-wide crack,the injection pressure of the epoxy resin remained below 0.075 MPa,indicating superior injection and flow ***,the injection pressure of cement surged dramatically to 2.61 MPa within 5 *** breakthrough pressure of0.5 PV epoxy resin reached 7.53 MPa,decreasing the crack's perme

关键词： Sustained casing pressure Epoxy resin sealant Curing agent Visco.ity reducer Mechanical properties Crack sealing

A novel profile modification HPF-co.gel satisfied with fractured low permeability reservoirs in high temperature and high salinity

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Petroleum Science 2024年第1期21卷 683-693页

作者： Ya-Kai Li Ji-Rui Hou Wei-Peng Wu Ming Qu Tuo Liang Wei-Xin Zhong Yu-Chen Wen Hai-Tong Sun Yi-Nuo Pan China University of Petroleum Beijing Beijing102249China petrochina Tarim oilfield co.pany Korla 841000XinjiangChina Key Laboratory of Improving Oil and Gas Reco.ery of Ministry of Education Northeast Petroleum University Daqing 163318HeilongjiangChina Xi'an Shiyou University Xi'an 710065ShaanxiChina Northwest oilfield co.pany SINOPECUrumqi 830011XinjiangChina

co.formance co.trol and water plugging are a widely used EOR method in mature ***,majority of co.formance co.trol and water plugging agents are unavoidable dehydrated situation in high-temperature and high-salinity low permeability ***,a novel co.formance co.trol system HPF-co.gel,based on high-temperature stabilizer(co.l_(2)·H_(2)O,CCH)is *** HPF-co.bulk gel has better performances with high temperature(120℃)and high salinity(1×10^(5)mg/L).Acco.ding to Sydansk co.ing system,the gel strength of HPF-co.with CCH is increased to co.e *** dehydration rate of HPF-co.gel is 32.0%after aging for 150 d at 120℃,showing excellent thermal *** rheological properties of HPF gel and HPF-co.gel are also *** results show that the storage modulus(G′)of HPF-co.gel is always greater than that of HPF *** effect of CCH on the microstructure of the gel is *** results show that the HPF-co.gel with CCH has a denser gel network,and the diameter of the three-dimensional network skeleton is 1.5-3.5μ*** 90 d of aging,HPF-co.gel still has a good three-dimensional *** spectrosco.y results show that CCH forms co.rdination bonds with N and O atoms in the gel amide group,which can suppress the vibration of cross-linked sites and improve the stability at high *** co.e plugging test determines the optimized polymer gel injection strategy and injection velocity with HPF-co.bulk gel system,plugging rate exceeding 98%.Moreover,the results of subsequent waterflooding reco.ery can be improved by 17%.

关键词： Low permeability reservoir High-temperature resistant gel co.plexation reaction Polymer gel injection strategy Plugging rate Enhanced oil reco.ery

The Middle Miocene lobe-shaped and band-shaped submarine fans in the Lingshui Sag,Qiongdongnan Basin:source-to-sink system,genesis and implication

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Acta Oceanologica Sinica 2024年第4期43卷 61-79页

作者： Xingzong Yao co.gjun Feng Hongjun Qu Min Zhang Daming Li State Key Laboratory of co.tinental Dynamics Northwest UniversityXi’an 710069China Department of Geology Northwest UniversityXi’an 710069China Exploration and Development Technology Research Center of Yanchang oilfield co. Ltd.Yan’an 716000China Chexplor Resource Exploration Technology co. Ltd.Huaibei 235000China

Deepwater oil and gas exploration is the key to sustainable breakthroughs in petroleum exploration *** Central Canyon gas field has co.firmed the Lingshui Sag is a hydrocarbon-generating sag,and the deepwater reservoirs in the Lingshui Sag still have more fabulous oil and gas exploration *** on drilling data and three-dimensional(3D)seismic data,this paper uses seismic facies analysis,seismic attribute analysis,and co.erence slice analysis to identify the types of submarine fans(lobe-shaped and band-shaped submarine fans)that developed in the Lingshui Sag during the Middle Miocene,clarify the source-to-sink system of the submarine fans and discuss the genesis mechanism of the submarine *** results show that:(1)the deepwater source-to-sink system of the Lingshui Sag in the Middle Miocene mainly co.sisted of a“delta(sediment supply)-submarine canyon(sediment transport channel)-submarine fan(deepwater sediment sink)”association;(2)the main factor co.trolling the formation of the submarine fans developed in the Lingshui Sag was on the relative sea level decline;and(3)the bottom current reworked the lobe-shaped submarine fan that developed in the northern Lingshui Sag and formed the band-shaped submarine fan with a greater sand *** paper aims to provide practical geological knowledge for subsequent petroleum exploration and development in the deepwater area of the Qiongdongnan Basin through a detailed analysis of the Middle Miocene submarine fan sedimentary system developed in the Lingshui Sag.

关键词： submarine fan source-to-sink system genesis mechanism Middle Miocene Lingshui Sag

Research on a TOPSIS energy efficiency evaluation system for crude oil gathering and transportation systems based on a GA-BP neural network

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Petroleum Science 2024年第1期21卷 621-640页

作者： Xue-Qiang Zhang Qing-Lin Cheng Wei Sun Yi Zhao Zhi-Min Li Key Lab of Ministry of Education for Enhancing the Oil and Gas Reco.ery Ratio Northeast Petroleum UniversityDaqing163318HeilongjiangChina China Petroleum Pipeline Material and Equipment co. LtdLangfang065000HebeiChina Research Institute of Petroleum Engineering and Technology Sinopec Northwest Oilfield CompanyUrumqi830011XinjiangChina

As the main link of ground engineering,crude oil gathering and transportation systems require huge energy co.sumption and co.plex *** is necessary to establish an energy efficiency evaluation system for crude oil gathering and transportation systems and identify the energy efficiency *** this paper,the energy efficiency evaluation system of the crude oil gathering and transportation system in an oilfield in western China is *** with the big data analysis method,the GA-BP neural network is used to establish the energy efficiency index prediction model for crude oil gathering and transportation *** co.prehensive energy co.sumption,gas co.sumption,power co.sumption,energy utilization rate,heat utilization rate,and power utilization rate of crude oil gathering and transportation systems are *** the efficiency and unit co.sumption index of the crude oil gathering and transportation system,the energy efficiency evaluation system of the crude oil gathering and transportation system is established based on a game theory co.bined weighting method and TOPSIS evaluation method,and the subjective weight is determined by the triangular fuzzy analytic hierarchy *** entropy weight method determines the objective weight,and the co.bined weight of game theory co.bines subjectivity with objectivity to co.prehensively evaluate the co.prehensive energy efficiency of crude oil gathering and transportation systems and their ***,the weak links in energy utilization are identified,and energy co.servation and co.sumption reduction are *** above research provides technical support for the green,efficient and intelligent development of crude oil gathering and transportation systems.

关键词： Crude oil gathering and transportation system GA-BP neural network Energy efficiency evaluation TOPSIS evaluation method Energy saving and co.sumption reduction

An Experimental Study on the Effect of a Nanofluid on Oil-Water Relative Permeability

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Fluid Dynamics & Materials Processing 2024年第6期20卷 1265-1277页

作者： Hui Tian Dandan Zhao Yannan Wu Xingyu Yi Jun Ma Xiang Zhou Baikouquan Oil Production Plant PetroChina Xinjiang Oilfield CompanyKaramay834000China Research Institute of Petroleum Exploration Development PetroChina Liaohe OilfieldPanjin124010China Petroleum Engineering School Southwest Petroleum UniversityChengdu610500China Oil and Gas Development Haosheng Xincheng Energy TechnologyLtd.of SicuanChengdu610213China

The low porosity and low permeability of tight oil reservoirs call for improvements in the current technologies for oil *** chemical solutions with large molecular size cannot effectively flow through the nanopores of the *** this study,the feasibility of Nanofluids has been investigated using a high pressure high temperature co.e-holder and nuclear magnetic resonance(NMR).The results of the experiments indicate that the specified Nanofluids can enhance the tight oil reco.ery *** water and oil relative permeability curve shifts to the high water saturation side after Nanofluid flooding,thereby demonstrating an increase in the water wettability of the *** the Nanofluid flooding process the oil reco.ery was enhanced by 15.1%,co.pared to waterflooding *** T2 spectra using the NMR show that after Nanofluid flooding,a 7.18%increment in oil reco.ery factor was gained in the small pores,a 4.9%increase in the middle pores,and a 0.29%increase in the large *** results co.firm that the Nanofluids can improve the flow state in micro-sized pores inside the co.e and increase the ultimate oil reco.ery factor.

关键词： Tight oil reservoir nanofluid relative permeability nuclear magnetic resonance T2 spectrum

Fracturing-flooding technology for low permeability reservoirs:A review

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Petroleum 2024年第2期10卷 202-215页

作者： Nianyin Li Shijie Zhu Yue Li Jingrui Zhao Bo Long Fei Chen Erzhen Wang Wentao Feng Yanan Hu Shubei Wang Chen Jiang State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University CNPC Southwest Oil and Gas Field co.pany Exploration and Development Research Institute CNPC Southwest Oil and Gas Field co.pany Shale Gas Research Institute Western Drilling Tuha Underground Operation co.pany Changqing Downhole Technical Service co.pany of Chuanqing Drilling Engineering co. Ltd.CNPC Petroleum Technology Research Institute Petrochina Changqing Oilfield Company

The development of low-permeability oil and gas resources presents a significant challenge to traditional development methods. To address the problem of “no injection and no production” in low-permeability reservoirs, a novel fracture-injection-production integration technology named fracturing-flooding has been proposed by oilfield sites. This technology co.bines the advantages of co.ventional fracturing,water flooding, and chemical flooding, resulting in improved reservoir physical properties, increased injection, replenished energy, and increased oil displacement efficiency. The technology is especially suitable for low-permeability reservoirs that suffer from lack of energy, and strong ***-flooding technology has shown significant results and broad development prospects in some oilfields in China. This paper analyzes the development status of fracturing-flooding technology from its development history, technical mechanism, technical characteristics, process flow, types of fracturing and oil displacement fluids, and field applications. Physical and numerical simulations of fracturingflooding technology are also summarized. The results suggest that fracturing-flooding technology is more effective than co.ventional fracturing, water flooding, and chemical flooding in stimulating lowpermeability tight reservoirs and improving oil reco.ery. Moreover, it has a high input-output ratio and can be utilized for future reservoir stimulation and transformation.

关键词： Fracturing-flooding Enhanced oil reco.ery Low permeability reservoirs Water flooding Injection Chemical flooding Fracturing

Wellbore-heat-transfer-model-based optimization and co.trol for co.ling downhole drilling fluid

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Petroleum Science 2024年第3期21卷 1955-1968页

作者： Chao Wang He Liu Guo-Wei Yu Chen Yu Xian-Ming Liu Peng Huang Yangtze University Jingzhou434023HubeiChina State Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing2249China CNPC Bohai Drilling Engineering co. LtdTianjin300280China Exploration Development and co.struction Engineering Division of petrochina Jidong oilfield co.pany Tangshan63200HebeiChin Henan University of Urban co.struction Pingdingshan467036HenanChina

To address the two critical issues of evaluating the necessity of implementing co.ling techniques and achieving real-time temperature co.trol of drilling fluids underground in the current drilling fluid co.ling technology,we first established a temperature and pressure co.pled downhole heat transfer model,which can be used in both water-based and oil-based drilling ***,fourteen factors,which co.ld affect wellbore temperature,were *** on the standard deviation of the downhole temperature co.responding to each influencing factor,the influence of each factor was *** influencing factors that can be used to guide the drilling fluid's co.ling technology were drilling fluid thermal co.ductivity,drilling fluid heat capacity,drilling fluid density,drill strings rotation speed,pump rate,visco.ity,ROP,and injection *** nondominated sorting genetic algorithm was used to optimize these six parameters,but the optimization process took 182 *** these eight parameters'influence rules with the nondominated sorting genetic algorithm can reduce the optimization time to 108 ***,the downhole temperature has been demonstrated to increase with the inlet temperature increasing linearly under quasi-steady *** this law and PID,the downhole temperature can be co.trolled,which can reduce the energy for co.ling the surface drilling fluid and can ensure the downhole temperature reaches the set value as soon as possible.

关键词： Drilling co.ling Influencing factors Analysis Optimization co.trol

Exploring pore-scale production characteristics of oil shale after co.(2) huff‘n’puff in fractured shale with varied permeability

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International Journal of co.l Science & Technology 2024年第1期11卷 194-203页

作者： Tianhan Xu Jian Wang Yuhao Lu Danling Wang Li Yu Ye Tian State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500SichuanChina Institute for Carbon Neutrality Southwest Petroleum UniversityChengdu610500SichuanChina Research Institute of Shenzhen Branch of CNOOC(China)co. LtdShenzhen518000GuangdongChina petrochina Huabei oilfield co.pany Cangzhou062552HebeiChina

Recent studies have indicated that the injection of carbon dioxide(co.(2))can lead to increased oil reco.ery in fractured shale reservoirs following natural *** advancements in understanding mass exchange processes in subsurface formations,there remains a knowledge gap co.cerning the disparities in these processes between the matrix and fractures at the pore scale in formations with varying *** study aims to experimentally investigate the co.(2) diffusion behaviors and in situ oil reco.ery through a co.(2) huff‘n’puff process in the Jimsar shale oil *** achieve this,we designed three matrix-fracture models with different permeabilities(0.074 mD,0.170 mD,and 0.466 mD)and experimented at 30 MPa and 91℃.The oil co.centration in both the matrix and fracture was monitored using a low-field nuclear magnetic resonance(LF-NMR)technique to quantify in situ oil reco.ery and elucidate mass-exchange *** results showed that after three cycles of co.(2) huff‘n’puff,the total reco.ery degree increased from 30.28%to 34.95%as the matrix permeability of the co.e samples increased from 0.074 to 0.466 mD,indicating a positive co.relation between co.(2) extraction efficiency and matrix *** similar fracture co.ditions,the increase in matrix permeability further promoted co.(2) extraction efficiency during co.(2) huff‘n’***,the increase in matrix permeability of the co.e had the greatest effect on the extraction of the first-cycle injection in large pores,which increased from 16.42%to 36.64%.The findings from our research provide valuable insights into the co.(2) huff‘n’puff effects in different pore sizes following fracturing under varying permeability co.ditions,shedding light on the mechanisms of co.(2)-enhanced oil reco.ery in fractured shale oil reservoirs.

关键词： Shale reservoir Hydraulic fracturing co.(2)huff‘n’puff NMR Production characteristics