Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (6): 180-190.doi: 10.12108/yxyqc.20250617

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

Development characteristics and reasonable injection-production pressuredifference of SAGD under different injection-production well patternsin bottom water reservoirs

ZHAN Shengyun1, TONG Jianxiang2, WANG Zhendong2, BAI Yuting1, WANG Taichao1   

  1. 1. State Key Laboratory of Offshore Oil Efficient Development, CNOOC Research Institute Co., Ltd., Beijing 100028, China;
    2. School of Petroleum Engineering, China University of Petroleum(Beijing), Beijing 102249, China
  • Received:2024-10-22 Revised:2025-01-12 Online:2025-11-01 Published:2025-11-07

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Abstract: SAGD production law of inclined dual horizontal well in the bottom water heavy oil reservoir of block A in Bohai Oilfield is complex, with high remaining oil saturation and high water cut.Through the physical simulation experiment, the characteristics of temperature field change and production laws of the forward and in clined horizontal wells during the SAGD development process were analyzed. Combined with the numerical simulation method, the influence of injection-production pressure difference on SAGD production efficiency is discussed, and the reasonable injection-production pressure difference range of horizontal well SAGD is clarified. The results show that : (1) SAGD steam chamber of the forward dual horizontal well extends to both sides of the model, and the oil drainage capacity of the inclined plane on both sides of the steam chamber is balanced.However, the expansion speed of the SAGD steam chamber and the oil drainage capacity of the inclined plane ofthe inclined dual horizontal well are unbalanced, resulting in a smaller steam chamber coverage area and lower recovery degree. The production process of dual horizontal well SAGD can be divided into three stages: oil production rate rising stage, stable production stage and falling stage. In the stable production stage, the steam chamber is in the lateral expansion stage, which is dominated by gravity drainage.(2) The SAGD production well in block A of Bohai Oilfield has a water avoidance distance of 10 m. Numerical simulation results show that: when the bottom water energy is less than 10 times and the bottom water has no effect on the production efficiency of horizontal well SAGD. In the stable production stage of dual horizontal well SAGD, with the increase of injection-production pressure difference, the steam injection and liquid production gradually increase, the oil production first increases and then gradually decreases, the cumulative oil-steam ratio first increases and then decreases, and both the sub-cool value and the height of steam-liquid interface decrease gradually. When there is no steam channeling in the production well, the oil production of the forward horizontal well is greater than that of the inclined horizontal well. The reasonable injection-production pressure difference of SAGD in forward and inclined horizontal wells is 20-30 kPa and 30-40 kPa, respectively.

Key words: heavy oil, bottom water reservoir, inclined dual horizontal well, SAGD development, injection-production pressure difference, physical simulation, numerical simulation, Bohai Oilfield

CLC Number: 

  • TE345
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