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Fracturing-flooding technology for low permeability reservoirs:A review

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 Company Exploration and Development Research Institute CNPC Southwest Oil and Gas Field Company Shale Gas Research Institute Western Drilling Tuha Underground Operation Company Changqing Downhole Technical Service Company 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 combines the advantages of conventional 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 conventional fracturing, water flooding, and chemical flooding in stimulating lowpermeability tight reservoirs and improving oil recovery. 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 recovery low permeability reservoirs Water flooding Injection Chemical flooding Fracturing

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TRANSIENT PRESSURE OF PERCOLATION THROUGH ONE DIMENSION POROUS MEDIA WITH THRESHOLD PRESSURE GRADIENT

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Applied Mathematics and Mechanics(English Edition) 1999年第1期20卷 27-35页

作者：宋付权刘慈群李凡华 Institute of Porous Flow and Fluid Mechanics Acadimia Sinica 065007 Langfang P. R. China

This paper studies the transient pressure of percolation during one production and one shutting in one dimension porous media with threshold pressure gradient, the differential equations are derived and solved with numerical computation. Basing on numerical solution, it is analyzed that: 1. the relation between the steady pressure at well bore (or at endpoint) and threshold pressure gradient, shut-in time, and the corresponding formulae are derived; 2, the regulation of transient pressure peak. The result is very useful and will help experiments and applications in the development of low permeability reservoirs with threshold pressure gradient.

关键词： low permeability reservoirs threshold pressure gradient moving boundary numerical computation

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Effect of absorption boundary layer on nonlinear flow in low permeability porous media

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Journal of Central South University 2011年第4期18卷 1299-1303页

作者：王学武杨正明齐亚东黄延章 Institute of Porous Flow and Fluid Mechanics Chinese Academy of Sciences Langfang Branch Petro China Exploration and Development Research Institute

Taking low permeability cores of Daqing oilfield for example,the flow characteristics at low velocity were studied with the self-designed micro-flux measuring *** the throat distribution and capillary model,the thickness of fluid boundary layer under different pressure gradients was calculated,and the mechanism and influencing factors of nonlinear percolation were *** results show that the percolation curve of ultra-low rocks is nonlinear,and apparent permeability is not a constant which increases with pressure *** absorption boundary layer decreases with the increase of pressure gradient,and changes significantly especially in low pressure gradient,which is the essence of nonlinear *** absorption boundary layer is also found to be impacted by the surface property of rocks.

关键词： low permeability reservoirs percolation absorption boundary layer capillary model

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Experimental and Theoretical Investigation of Nonlinear Flow in low permeability Reservoir

Experimental and Theoretical Investigation of Nonlinear Flow...

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2011 International Conference on Energy and Environment(ICEE 2011)

作者： WANG Xue-wu YANG Zheng-ming SUN Yu-ping LIU Xue-wei Lang fang Branch Petro China Exploration and Development Research Institute

Taking low permeability cores of Daqing oilfield for example, the flow characteristics at low velocity were studied by using the self-designed micro-flux measuring instrument. Considering the throat distribution and capillary model, the thickness of fluid boundary layer under different pressure gradient was calculated, the mechanism and influencing factors of nonlinear percolation were discussed. The study showed that the percolation curve of ultra-low rocks was nonlinear, and apparent permeability was not a constant, which increased with pressure gradient. The absorption boundary layer decreased with the increase of pressure gradient, and changed significantly especially in low pressure gradient, which was the essence of bringing nonlinear percolation. The absorption boundary layer was also found to be impacted by surface property of rocks, and then impacted flow characteristics.

关键词： low permeability reservoirs percolation nonlinear absorption boundary layer capillary model

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Experimental and Theoretical Investigation of Nonlinear Flow in low permeability Reservoir

Experimental and Theoretical Investigation of Nonlinear Flow...

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2011 2nd International Conference on Challenges in Environmental Science and Computer Engineering(CESCE 2011)

作者： WANG Xue-wu YANG Zheng-ming SUN Yu-ping LIU Xue-wei Lang fang Branch Petro China Exploration and Development Research Institute

Taking low permeability cores of Daqing oilfield for example,the flow characteristics at low velocity were studied by using the self-designed micro-flux measuring *** the throat distribution and capillary model,the thickness of fluid boundary layer under different pressure gradient was calculated,the mechanism and influencing factors of nonlinear percolation were *** study showed that the percolation curve of ultra-low rocks was nonlinear,and apparent permeability was not a constant,which increased with pressure *** absorption boundary layer decreased with the increase of pressure gradient,and changed significantly especially in low pressure gradient,which was the essence of bringing nonlinear *** absorption boundary layer was also found to be impacted by surface property of rocks,and then impacted flow characteristics.

关键词： low permeability reservoirs percolation nonlinear absorption boundary layer capillary model

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