Influence of EBIP Thickness Variation Modes on SAGD Production Characteristics in Super Heavy Oil Reservoirs

doi:10.11885/j.issn.1674-5086.2020.06.15.02

Abstract

Abstract: Steam assisted gravity drainage (SAGD) is a promising heavy oil development method, which has achieved good results in super heavy oil/oil sand development. Due to reservoir sedimentation, the effective reservoir thickness (EBIP) along the SAGD horizontal well section will change, which makes the development effect of SAGD well group significantly different. In order to make clear the influence of EBIP changing along horizontal well section to SAGD production, based on the geological characteristics of Long Lake oilfield in Canada, 3 typical EBIP thickness change modes are constructed. Subsequently, the SAGD numerical simulation mechanism model is established, and SAGD steam chamber breakthrough, daily oil production, cumulative gasoline ratio and recovery degree influenced by the EBIP change modes and thickness difference are analyzed and discussed. Finally, limits of on SAGD production which are influenced by the EBIP thickness are built. The results show that under the same total thickness of reservoir, the peak oil production speed and recovery degree of stepped EBIP change mode are the lowest, and the production characteristics of the other two modes are similar. Under stepped EBIP mode, the thickness difference 6 4 m is excellent, the thickness difference of 4～10 m is good, and the thickness difference >10 m is poor. Under two thick-one thin and two thin-one thick EBIP mode, the thickness difference <7 m is excellent, and the thickness difference >7 m has a great impact on SAGD production.

Key words: super heavy oil, SAGD, effective reservoir thickness, EBIP, peak production rate

CLC Number:

TE312

DUAN Yonggang, WU Zijian, WEI Mingqiang, REN Keyi, LU Chuan. Influence of EBIP Thickness Variation Modes on SAGD Production Characteristics in Super Heavy Oil Reservoirs[J]. 西南石油大学学报(自然科学版), 2020, 42(5): 127-134.

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