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The mechanism of hydraulic fracturing assisted oil displacement to enhance oil recovery in low and medium permeability reservoirs

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Petroleum Exploration and Development 2022年第4期49卷 864-873页

作者： LIU Yikun WANG Fengjiao WANG Yumei LI Binhui ZHANG Dong YANG Guang ZHI Jiqiang SUN Shuo WANG Xu DENG Qingjun XU He Laboratory of Enhanced oil Recovery of Education Ministry Northeast Petroleum UniversityDaqing 163318China Postdoctoral Res Ctr Daqing Oilfield Company LimitedDaqing 163453China Downhole Services Company of Daqing oilfield Company Limited Daqing 163453China Exploration and Development Research Institute of Daqing oilfield Company Limited Daqing 163712China The NO.1 Production Plant of Daqing oilfield Company Limited Daqing 163712China

Aiming at the technology of hydraulic fracturing assisted oil displacement which combines hydraulic fracturing,seepage and oil displacement,an experimental system of energy storage and flowback in fracturing assisted oil displacement process has been developed and used to simulate the mechanism of percolation,energy storage,oil displacement and flowback of chemical agents in the whole process.The research shows that in hydraulic fracturing assisted oil displacement,the chemical agent could be directly pushed to the deeper area of the low and medium permeability reservoirs,avoiding the viscosity loss and adhesion retention of chemical agents near the pay zone;in addition,this technology could effectively enlarge the swept volume,improve the oil displacement efficiency,replenish formation energy,gather and exploit the scattered residual oil.For the reservoir with higher permeability,this measure takes effect fast,so to lower cost,and the high pressure hydraulic fracturing assisted oil displacement could be adopted directly.For the reservoir with lower permeability which is difficult to absorb water,hydraulic fracturing assisted oil displacement with surfactant should be adopted to reduce flow resistance of the reservoir and improve the water absorption capacity and development effect of the reservoir.The degree of formation energy deficit was the main factor affecting the effective swept range of chemical agents.Moreover,the larger the formation energy deficit was,the further the seepage distance of chemical agents was,accordingly,the larger the effective swept volume was,and the greater the increase of oil recovery was.Formation energy enhancement was the most important contribution to enhanced oil recovery(EOR),which was the key to EOR by the technology of hydraulic fracturing assisted oil displacement.

关键词： hydraulic fracturing chemical flooding formation energy enhancement remaining oil distribution oil displacement mechanism enhancing oil recovery

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The effect of interbeds on distribution of i ncremental oil displaced by a polymer flood

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Petroleum Science 2011年第2期8卷 200-206页

作者： Hou Jian Du Qingjun Lu Teng Zhou Kang Wang Rongrong School of Petroleum Engineering China University of Petroleum Dongying Shandong 257061 China School of Geo-resources and Information China University of Petroleum Dongying Shandong 257061 China

This paper discusses the effect of influencing factors on the distribution of incremental oil displaced by a polymer flood （extra-displaced oil） using numerical reservoir simulation. These factors include the location, area and permeability of a thin low-permeability interbed, and the perforation location relative to the interbed. Simulation results show the locations from where the incremental oil was displaced by the polymer solution. The interbed position from the oil formation top affects the location of extra-displaced oil. The interbed area has a slight influence on the whole shape of extra-displaced oil. Larger interbed area leads to higher partition extent of extra-displaced oil. Higher vertical permeability of interbeds contributes to worse partition extent of extra-displaced oil and the partition effect disappears if the ratio of vertical to horizontal permeability is more than 0.05. The perforation location relative to the interbed affects polymer displacement efficiency, and also has a significant effect on the distribution of extra-displaced oil in polymer flooding.

关键词： Reservoir simulation polymer flooding interbed remaining oil distribution

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TECHNOLOGIES DEVELOPED IN DAQING oil FIELD FOR MAINTAINING A LONG-TERM CONTINUOUS STABLE PRODUCTION PERIOD AT HIGH WATER-CUT STAGE

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石油勘探与开发 1997年第1期24卷 84-88+90页

作者： Chao Huaqing Xu Yunxin (Daqing Petroleum Administration, CNPC, Heilongjiang, 163003)

Technologies, such as structural adjustment in water-oil production, polymer drive, pilot test insurfactant-polymer flooding etc. have been developed in Daqing oil field in order to maintain a long-term stableproduction period in its high water-cut production period. Sophisticated geological studies to identify thedistribution of remaining oil, especially in those low permeability layers, give a rational geological basis for thedevelopment of these technologjes. Accompanied technologies, such as detailed numerical reservoir simulationand oilfield management etc. have been developed successfully. All those technologies have been confirmed byfield practice to be very successful.

关键词： Stable production oilfield development Polymer oil displacement mechanism remaining oil distribution oil reservoir description Numerical simulation Daqing oil field

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