Selective Water Plugging Technology for Horizontal Well with Screen Completion

Bo Deng, Zhiwei Jia, Wei Liu, Xiaoqiang Liu, Jianwei Gu, Weibao Ye, Hongbin Wen and Zhanqing Qu
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Bo Deng: College of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
Zhiwei Jia: Drilling and Production Technology Research Institute of Qinghai Oilfield, Dunhuang 736202, China
Wei Liu: College of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
Xiaoqiang Liu: College of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
Jianwei Gu: College of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
Weibao Ye: Shandong Shida Oilfield Technical Services Co., Ltd., Dongying 257000, China
Hongbin Wen: Shandong Shida Oilfield Technical Services Co., Ltd., Dongying 257000, China
Zhanqing Qu: College of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China

Energies, 2021, vol. 14, issue 4, 1-14

Abstract: The SD107 gel system developed has good oil–water phase selective gelation and oil–water phase selective blocking properties. The static gel-forming experiment results showed that the gel water shutoff system formulated with oilfield reinjection water (oil content < 0.05%) has a viscosity of 200 mPa·s after gelation, and the gel water plugging system formulated with oilfield produced fluid (oil content ≥ 20.0%) had a viscosity of 26 mPa·s after gelation. Results of the core physical simulation experiment indicated that the enhanced recovery rate was the highest (34.6%) when the resistance ratio of the high-low permeability core was about 10.0 after plugging. As per the fluid volume ( Q ) of the oil well to be blocked, the maximum production pressure difference (∆ P ) was predicted, and on the basis of economic output, the resistance of the oil section, the resistance of the high water cut section, and the resistance of the water outlet section after plugging was used to calculate the plugging depth (re1, the limit water plugging radius), which offers a basis for the design of water plugging process parameters for horizontal wells. The field water plugging test results showed that after using this water plugging technology, the daily oil production increased from about 4 t/d to 20 t/d, the daily oil increase was 16 t/d, and the water cut decreased from 75% to about 25%. The water-blocking construction was a success.

Keywords: screened horizontal well; seepage resistance; selective water plugging agent; water plugging scheme design; field test (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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