Experimental Study on Improving Oil Recovery Mechanism of Injection–Production Coupling in Complex Fault-Block Reservoirs

Zhe Zhang, Hongjun Gan, Chao Zhang, Shengbin Jia, Xianzheng Yu, Kejian Zhang, Xinyu Zhong, Xiaolei Zheng, Tao Shen, Le Qu and Rongjun Zhang ()
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Zhe Zhang: School of Petroleum Engineering, Xi‘an Shiyou University, Xi’an 710065, China
Hongjun Gan: The Second Production Plant, SINOPEC Henan Oilfield Branch, Nanyang 473400, China
Chao Zhang: The Second Production Plant, SINOPEC Henan Oilfield Branch, Nanyang 473400, China
Shengbin Jia: The Second Production Plant, SINOPEC Henan Oilfield Branch, Nanyang 473400, China
Xianzheng Yu: The Second Production Plant, SINOPEC Henan Oilfield Branch, Nanyang 473400, China
Kejian Zhang: The Second Production Plant, SINOPEC Henan Oilfield Branch, Nanyang 473400, China
Xinyu Zhong: Xi’an Key Laboratory of Tight Oil (Shale Oil) Development, Xi’an Shiyou University, Xi’an 710065, China
Xiaolei Zheng: School of Earth Sciences and Engineering, Xi’an Shiyou University, Xi’an 710065, China
Tao Shen: School of Earth Sciences and Engineering, Xi’an Shiyou University, Xi’an 710065, China
Le Qu: Xi’an Key Laboratory of Tight Oil (Shale Oil) Development, Xi’an Shiyou University, Xi’an 710065, China
Rongjun Zhang: School of Petroleum Engineering, Xi‘an Shiyou University, Xi’an 710065, China

Energies, 2024, vol. 17, issue 6, 1-19

Abstract: In order to improve the effect of injection–production coupling development to improve crude oil recovery in complex fault-block reservoirs, we carried out a physical simulation experiment based on a sandpack model of transforming water-driven development into injection–production coupling development and quantitatively evaluated the influence of rounds of injection pressure coupling on the crude oil mobilization in reservoirs with different permeability levels and on oil recovery. Meanwhile, the characteristics of residual oil were studied via a numerical simulation method. The mechanism of increased oil production via injection–production coupling development was revealed by analyzing the water and oil contents, formation pressure, and streamline fields through the establishment of mechanism models. The results of the physical experiment show that injection–production coupling can improve the recovery effect of medium- and low-permeability reservoirs by 55.66%. With an increase in the injection pressure, the oil recovery percentage of the low-permeability sandpack model at 20 MPa is 100%, and this study finds that injection–production coupling is the main way to develop the recoverable oil in a low-permeability reservoir. The numerical simulation results show that among the four remaining oil distribution types (interwell-enriched, low-permeability zone-enriched, well network imperfection, and mismatch between injection and production), the interwell-enriched type of the remaining oil reserves accounts for the highest proportion (48.52%). The simulation results of the mechanism model show that water-driven development easily leads to streamline solidification, resulting in ineffective circulation of the injected water. Compared with conventional water-driven development, the pressure propagation range is significantly increased in injection–production coupling development. The reservoir streamline distribution is more continuous and uniform, and the flooding wave is wider in volume and range. This research provides a theoretical basis for the injection–production coupling technology policy in complex fault-block reservoirs.

Keywords: fault-block reservoirs; sandpack model; oil recovery; remaining oil characterization; numerical simulation (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: 2024
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