Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (3): 180-188.doi: 10.12108/yxyqc.20240317

• PETROLEUM ENGINEERING AND OIL & GAS FIELD DEVELOPMENT • Previous Articles    

Mechanism and field practice of enhanced oil recovery by injection-production coupling in fault block reservoirs

LIU Renjing1, LU Wenming2   

  1. 1. Sinopec International Exploration and Production Corporation, Beijing 100029, China;
    2. Sinopec Petroleum Exploration and Production Research Institute, Beijing 102206, China
  • Received:2022-10-04 Revised:2023-05-28 Published:2024-04-30

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Abstract: Aiming at the problem of ineffective circulation of injected water caused by fixed streamline in the late stage of water drive development of Paleogene fault block reservoirs in Dongying Sag, Jiyang Depression, Bohai Bay Basin, based on seepage mechanics and reservoir engineering principles, the injection-production coupling development adjustment technology of“subdividing development layers, rotating injection and production”was proposed by means of indoor physical model simulation and reservoir numerical simulation, and the mechanism of enhancing oil recovery by this technology was clarified. The results show that:（1）The water absorption ratio model between high permeability channel and low permeability channel during injection and the oil production ratio model of mainstream line and non-mainstream line during oil production established by the injection-production coupling development technology reveal the injection-production coupling seepage mechanics mechanism of“changing pressure field to promote the adjustment of seepage field, achieving balanced injection and production, expanding sweep efficiency of water drive and increasing the oil displacement efficiency”. （2）The injection-production coupling technology can achieve remarkable development effect of“expanding sweep efficiency and increasing oil displacement efficiency”, that is, it plays a similar role of“profile control”. During the high water cut period, this technology can increase the diversion rate of low permeability cores from 1.0% to 18.6%, and the model displacement is more balanced. After two rounds of injection-production coupling adjustment, the oil recovery of high and low permeability cores increased by 10.3% and 16.1%, respectively. （3）The numerical simulation results of injection-production coupling development of Es236 oil-bearing sublayer of Paleogene Shahejie Formation in fault block D of the study area show that the displacement of mainstream line and non-mainstream line was more balanced, and the pressure gradient range between them decreased from 2.3 to 1.4. After three rounds of injection-production coupling development and adjustment, the average comprehensive water cut of the reservoirs in the third to the sixth sand layers of the second member of Shahejie Formation decreased by 3.2%, and the cumulative oil production increased by 1 760 t, which improved the oil recovery by 2.1%, and the effect of increasing oil production and dewatering was remarkable.

Key words: injection-production coupling, physical simulation, numerical simulation, range, seepage field, water drive recovery, fault block reservoir, Shahejie Formation, Dongying Sag, Bohai Bay Basin

CLC Number: 

  • TE312
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