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Pore-scale water-gas distribution and gas permeability of natural gas hydrate reservoirs in the South China Sea

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Geoscience Frontiers 2024年第4期15卷 315-329页

作者： Yuxuan Xia Derek Elsworth Jianchao Cai Cheng Lu Chao Ma National Key Laboratory of Petroleum Resources and Engineering China University of PetroleumBeijing 102249China Department of Energy and Mineral Engineering G3 Center and Energy InstituteThe Pennsylvania State UniversityUniversity Park 16802PAUnited States Guangzhou Marine Geological Survey China Geological SurveyGuangzhou 510075China Center of oil&Natural Gas Resource Exploration China Geological SurveyBeijing 100083China

Challenges in water drainage within natural gas hydrate reservoirs in the Shenhu area of the South China Sea,characterized by high clay content and strong hydrophilicity,significantly hinder natural gas *** the effects of gas pressure and liquid/gas saturation on gas permeability reveals essential insights for increasing gas production *** report gas displacement experiments on clayey-silt sediment samples,alongside X-ray computed tomography imaging,that reveal critical findings:a notable increase in flow rate and permeability as displacement pressure nears compaction pressure,highlighting the role of pressure management in enhancing recovery;water displacement from varying pore sizes under different pressures,highlighting the influence of pore size on fluid dynamics,and structural changes,including microfracture formation and a significant fracture that enlarges total pore space by about 15%,which collectively suggest methods to improve gas flow and ***,our analysis identifies average throat length,fractal dimension,and succolarity as principal controls on gas permeability,indicating the substantial impact of microstructural properties on extraction *** outcomes offer valuable strategies for optimizing natural gas hydrate reservoir development in the South China Sea,emphasizing the need for meticulous pressure and saturation control and in applying a deep understanding of microstructural dynamics.

关键词： Natural gas hydrate Clayey-silt sediments Gas saturation Gas permeability Microstructure

Effects of Reservoir Minerals and Chemical Agents on Aquathermolysis of Heavy oil during Steam Injection

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China Petroleum Processing & Petrochemical Technology 2010年第3期12卷 25-31页

作者： Zhang Xian Liu Yongjian Fan Yingcai Che Hongchang Key Laboratory for Enhanced oil recovery of Ministry of Education Northeast Petroleum University Daqing 163318 Daqing oilfield Company No.9 Production Plant Daqing 163853

In order to effectively reduce the viscosity of heavy oil during steam injection, a catalyst system, consisting of reservoir minerals, nickel sulfate, and formic acid, was used to exert catalytic effect on aquathermolysis of heavy crude oil extracted from the Liaohe oilfield. Experimental results indicated that all the reservoir minerals used in the experiment had catalytic effect on aquathermolysis and the oil viscosity reduction rate ranged from 24% to 36% after the aquathermolysis reaction. If nickel sulfate was used as the catalyst and added to the reaction system, the oil viscosity reduction rate could reach 50%. If formic acid was used as the hydrogen donor, the oil viscosity reduction rate could increase further, and could reach up to 71.8%. The aquathermolysis reaction of heavy oil under steam injection condition was affected by the reaction temperature, the reaction time, the dosage of minerals, the catalyst concentration, and the hydrogen donor. The experimental results showed that minerals, catalyst and hydrogen donor could work together to enhance aquathermolysis reaction of heavy oil in the presence of the high-temperature water vapor.

关键词： heavy oil aquathermolysis catalysis viscosity reduction

Characteristics and Origin of Tight oil Accumulations in the Upper Triassic Yanchang Formation of the Ordos Basin,North-Central China

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Acta Geologica Sinica(English Edition) 2016年第5期90卷 1821-1837页

作者： WU Songtao ZOU Caineng ZHU Rukai YAO Jingli TAO Shizhen YANG Zhi ZHAI Xiufen CUI Jingwei LIN Senhu Research Institute of Petroleum Exploration & Development PetroChina Beijing 100083 China State Key Laboratory of Enhanced oil recovery Beijing 100083 China CNPC Key Laboratory of oil and Gas Reservoirs Beijing 100083 China Changqing oilfield Company PetroChina Xi 'an 710067 Shaanxi China

The Upper Triassic oil accumulations in the Ordos Basin is the most successful tight oil play in China,with average porosity values of less than 10% and permeability values below 1.0 *** study investigated the geological characteristics and origin of the tight oil accumulations in the Chang 6 member of the Upper Triassic Yanchang Formation in the Shanbei area based on over 50,000 petrological,source-rock analysis,well logging and production *** tight oil accumulation of the Chang 6 member is distributed continuously in the basin slope and the centre of the *** oilwater relationships are *** dissolution pores are the most important storage spaces,constituting 30%-60% of total porosity and showing a strong positive relationship with oil *** pore-throat diameter is less than 1 μm,and the calculated critical height of the oil column is much larger than the tight sand thickness,suggesting that the buoyancy was probably of limited importance for oil *** pressure difference between the source rocks and sandstone reservoirs is inferred to have provided driving force for hydrocarbon *** factors of source-reservoir configuration and laumontite dissolution contributed to the formation of the Chang 6 tight oil *** hydrocarbon generation and continuous sand bodies close to the hydrocarbon kitchen are the foundation for the large-scale oil *** of feldspar-laumontite during the process of organic matter evolution generated abundant secondary pores and improved the reservoir quality.

关键词： tight oil diagenesis tight sand nanopores Yanchang Fm. Ordos Basin

Prediction and programming of microemulsion phase behavior simulation

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Petroleum Science 2022年第3期19卷 1401-1410页

作者： Dong-Qi Wang Dai-Yin Yin Jun-Da Wang Ya-Zhou Zhou Cheng-Li Zhang Department of Petroleum Engineering Northeast Petroleum UniversityDaqing163318China Key Laboratory of Enhanced oil recovery (Northeast Petroleum University)Ministry of EducationChina PetroChina Refining&Chemicals Company Beijing100007China

In the process of microemulsion flooding,microemulsion phase state may be affected by the adsorption of core and the distribution of oil and water,and the upper phase,the middle phase or the lower phase microemulsion will *** description of microemulsion phase state and quantitative discrimination of equilibrium phase composition are of great theoretical value and research significance for the design of microemulsion flooding system and improving the recovery efficiency of ***,in this paper,microemulsion phase model is deeply *** at the difficulty of solving the existing Hand model and the unknown parameters of the improved HLD-NAC model,we introduce the binodal curve range parameter D and the asymmetric migration degree parameter B,and establish a new phase behavior description method of the binodal curve,the two-phase plait point lines and the III-phase node *** the phase discrimination programming of microemulsion was carried out,and the change laws of phase number,phase type and mass fraction of equilibrium phases of any microemulsion system under different salinity were *** results show that the simulation results of microemulsions accord with the salinity scanning law,and can accurately identify the complex microemulsion phase states.

关键词： Microemulsion Phase model Conditions for phase discrimination Programming Salinity scanning

Oxidization characteristics and thermal miscible flooding of high pressure air injection in light oil reservoirs

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Petroleum Exploration and Development 2022年第4期49卷 874-885页

作者： XI Changfeng WANG Bojun ZHAO Fang LIU Tong QI Zongyao ZHANG Xialin TANG Junshi JIANG Youwei GUAN Wenlong WANG Hongzhuang HE Dongbo SONG Xinmin HUA Daode ZHANG Xiaokun State Key Laboratory of Enhanced oil recovery Beijing 100083China PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China China University of Geosciences Beijing 100083China

Physical modeling,numerical simulation and field case analysis were carried out to find out the subsurface thermal oxidation state,thermal oxidation front characteristics and production dynamic characteristics of high pressure air injection thermal oxidation miscible flooding *** lighter the composition and the lower the viscosity of the crude oil,the lower the fuel consumption and the combustion temperature *** thermal oxidation front of light oil and volatile oil can advance stably,and a medium-temperature thermal oxidation stable displacement state can be formed in the light oil reservoir under high pressure *** strong thermal gasification and distillation,light oil and volatile oil are likely to form a single phase zone of gasification and distillation with thermal flue gas at the high-temperature and high-pressure heat front,finally,an air-injection thermal miscible *** light oil reservoirs,the development process of high-pressure air-injection thermal miscible flooding can be divided into three stages:boosting pressure stage,low gas-oil ratio and high-efficiency stable production stage and high gas-oil ratio production *** 70%of crude oil is produced during the boosting pressure stage and low gas-oil ratio high-efficiency and stable production stage.

关键词： light oil reservoir air flooding displacement characteristics high-pressure oxidation front thermal miscible flooding fire flooding

Progress and prospects of carbon dioxide capture,EOR-utilization and storage industrialization

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Petroleum Exploration and Development 2022年第4期49卷 955-962页

作者： YUAN Shiyi MA Desheng LI Junshi ZHOU Tiyao JI Zemin HAN Haishui CNPC Advisory Center Beijing 100724China State Key Laboratory of Enhanced oil recovery Beijing 100083China Research Institute of Petroleum Exploration&Development PetroChinaBeijing 100083China

Carbon dioxide capture,EOR-utilization and storage(CCUS-EOR)are the most practical and feasible large-scale carbon reduction technologies,and also the key technologies to greatly improve the recovery of low-permeability oil *** paper sorts out the main course of CCUS-EOR technological development abroad and its industrialization *** progress of CCUS-EOR technological research and field tests in China are summarized,the development status,problems and challenges of the entire industry chain of CO_(2) capture,transportation,oil displacement,and storage are *** results show a huge potential of the large-scale application of CCUS-EOR in China in terms of carbon emission reduction and oil production *** present,CCUS-EOR in China is in a critical stage of development,from field pilot tests to *** at the feature of continental sedimentary oil and gas reservoirs in China,and giving full play to the advantages of the abundant reserves for CO_(2) flooding,huge underground storage space,surface infrastructure,and wide distribution of wellbore injection channels,by cooperating with carbon emission enterprises,critical technological research and demonstration project construction should be accelerated,including the capture of low-concentration CO_(2) at low-cost and on large-scale,supercritical CO_(2) long-distance transportation,greatly enhancing oil recovery and storage rate,and CO_(2) large-scale and safe ***-EOR theoretical and technical standard system should be constructed for the whole industrial chain to support and promote the industrial scale application,leading the rapid and profitable development of CCUS-EOR emerging industrial chain with innovation.

关键词： carbon dioxide CCUS-EOR carbon capture transportation oil displacement carbon storage enhanced oil recovery industrialization

Microparticle Effect of Carbon Dioxide Hydrate Crystal Nucleus in Reaction Kettle

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Journal of Renewable Materials 2021年第4期9卷 651-669页

作者： Yujie Bai Youquan Huang Guangsheng Cao Xiaohan Nan Qingchao Cheng Lei Wang Tong Du MOE Key Laboratory for Enhanced oil and Gas recovery Northeast Petroleum UniversityDaqingChina Petro China Jidong oilfield Company TangshanChina oil Production Engineering Research Institute of Daqing oilfield Petro ChinaDaqingChina School of Science Zhejiang UniversityHangzhou310000China

This study analyzed the partial effect of carbon dioxide hydrate in reaction kettle *** particle and bubble characteristics of the crystal nucleus during carbon dioxide hydrate decomposition were observed under the *** results showed that in the temperature range of 0.5℃–3.5℃,the pressure range of 3 MPa–5.5 MPa,phase characteristics in the reaction kettle changed in a complex fashion during carbon dioxide hydrate *** hydrate decomposition,numerous carbon dioxide bubbles were produced,mainly by precipitation at high temperatures or in the hydrate cage *** hydrate crystal nucleus initially exhibited fluidity in the ***,as the reaction progressed,the hydrate crystal nucleus migrated upward under the influence of gravity and carbon dioxide diffused into the aqueous ***,the hydrate was formed and accumulated,finally forming a solid carbon dioxide hydrate layer.

关键词： Carbon dioxide hydrate decomposition induction time particle characteristics

Multisourced CO_(2) Injection in Fan Delta Conglomerates and Its Influence on Reservoir Quality: Evidence from Carbonate Cements of the Baikouquan Formation of Mahu Sag, Junggar Basin, Northwestern China

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Journal of Earth Science 2021年第4期32卷 901-918页

作者： Ning Zhu Yingchang Cao Kelai Xi Songtao Wu Rukai Zhu Miaomiao Yan Shunkang Ning School of Geosciences China University of PetroleumQingdao 266580China Research Institute of Petroleum Exploration and Development CNPCBeijing 100083China Key Laboratory of oil and Gas Reservoirs CNPCBeijing 100083China National Energy Tight oil and Gas R&D Center Beijing 100083China Wenliu oil recovery Plant of Zhongyuan oilfield Branch Puyang 457000China

Sandy-conglomerate reservoir has gradually become a major target of oil and gas *** diagenetic process and diagenetic fluid play a significant role in affecting reservoir *** cements form at various stages of the diagenesis process and record various geological fluid ***,one-billion-ton sandy conglomerate oil field was exposed in Triassic Baikouquan Formation,Mahu sag,Junggar ***,an integrated study applying casting thin sections,cathodeluminescence,fluorescence,carbon and oxygen stable isotopes,electronic probe microanalysis and aqueous fluid inclusions measurements was performed in order to identify the types of carbonate mineral and its representative diagenetic environment and discuss the influences of different CO_(2) injections on reservoir *** main findings are as follows:The reservoir is mainly composed of 70.33%conglomerate and 16.06%coarse-grained *** are characterized by low compositional maturity and abundant lithic *** types carbonate cements are identified according to the petrological and geochemical characteristics,including two types of Mn-rich calcite,ferroan calcite,siderite and *** display an unusual broad spectrum ofδ^(13)C values(-54.99‰to+8.8‰),suggesting both organic and inorganic CO_(2) *** δ^(13)C values of siderite are close to 0,and its formation is related to meteoric ***δ^(13)C values of ferroan calcite and the occurrence of dawsonite indicate the trace of inorganic mantle-derived magmatic ***δ^(13)C values and trace elements of Mn-rich calcite record the information of hydrocarbon-bearing *** fluid inclusions measurement data and reservoir properties and oil-test data show that the oil content of reservoir is not only affected by the formation time of different cements,but also by the relative content of dissolution and *** these reservoirs altered by carbonate cements,it does not cause poor

关键词： carbonate cement CO_(2)fluid carbon and oxygen isotope reservoir Mahu sag Junggar Basin

Experimental Study on the Treatment of tertiary oil recovery Wastewater via a Novel Electro-Coagulation Method

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Fluid Dynamics & Materials Processing 2023年第1期19卷 51-60页

作者： Wei Cui Zhilun Yan Zhi Tang Mengyao Xu Jian Tian Chengyi Shen Petroleum Engineering Technology Research Institute of Sinopec Northwest oilfield Company Urumchi830011China Key Laboratory of Enhanced oil recovery in Carbonate Fractured-Vuggy Reservoirs Urumchi830011China

At present,methods for treating tertiary oil recovery wastewater via electro-coagulation are still in their early stage of *** this study,a device for electro-coagulation wastewater treatment was built and tested in an oil *** effects that the initial pH value,electrode type,and connection mode have on the coagulation and separation effect were assessed by measuring the mass fraction and turbidity of *** results have shown that when the electro-coagulation method is used,the effectiveness of the treatment can be significantly increased in neutral pH conditions(pH=7),in acidic conditions,and in alkaline *** to an Al electrode,the floc that is produced by an Fe electrode is smaller;thus,it does not easily coagulate and settle in a short *** the oil removal rate,turbidity removal rate and energy consumption as a basis to assess the performances,the results have demonstrated that the combined aluminum alloy iron composite electrode should be used as electrolytic electrode.

关键词： Electrocoagulation oily sewage polymer experiment study