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| Adaptability analysis of polymer flooding in mid-low permeability heavy oil reservoirs |
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JIANG Ping1,2, ZHOU Xiangyu2, YUAN Yufeng3, WANG Biao3, YU Xiaoling3, LI Longjie2, TANG Dengyu2, ZHANG Guicai1,2, GE Jijiang1,2, PEI Haihua1,2
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(1.Key Laboratory of Unconventional Oil and Gas Development, Ministry of Education (China University of Petroleum(East China)), Qingdao 266580, China;2.School of Petroleum Engineering in China University of Petroleum(East China),Qingdao 266580,China;3.Jiangsu Oilfield Branch of SINOPEC, Yangzhou 225009, China)
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| Abstract: |
| The applicability experiment and analysis of polymer flooding were carried out for mid-low permeability heavy oil reservoirs in Jiangsu Oilfield. The effective viscosity of polymer solution and crude oil were determined on the basis of the Darcy law. Then, the influence of seepage velocity on the effective viscosity of polymer was investigated. Based on the characterization of the hydrodynamic radius of polymer, the main reasons for the increase of polymer injection pressure were identified by correlation with core pore structure, and then the EOR effects of polymer flooding with different viscosity ratios were evaluated according to the effective viscosity of polymer and crude oil. The results show that, the upper limit of polymer concentration can be selected by measuring the hydrodynamic radius of polymer for mid-low permeability reservoirs. And the lower limit of polymer concentration is that the effective viscosity ratio of polymer to crude oil is greater than 0.2. |
| Key words: mid-low permeability reservoir conventional heavy oil polymer flooding effective viscosity enhanced recovery |
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