Enhanced Water⁃Drive Recovery Based on Microscopic Seepage Mechanism for Low Permeability Glutenite Reservoir with Ternary Pore⁃Throat Structure Characteristics of WS Field

被引：1

作者：

Peng X. ^{[1
]}

Zhang H. ^{[1
]}

Wang X. ^{[2
]}

Zhao N. ^{[1
]}

Wang L. ^{[2
,6
]}

Zhang H. ^{[1
]}

Yang C. ^{[2
]}

Chu S. ^{[3
]}

Sun L. ^{[4
]}

Yang Y. ^{[5
]}

机构：

[1] Hainan Branch of CNOOC Ltd., Haikou

[2] Zhanjiang Branch of CNOOC Ltd., Zhanjiang

[3] Petro China Research Institute of Petroleum Exploration & Development⁃Langfang, Langfang

[4] State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu

[5] State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu

[6] School of Earth Resources, China University of Geosciences, Wuhan

来源：

Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2023年 / 48卷 / 08期

关键词：

complex pore structure; glutenite; low permeability reservoir; low valent and high salinity water flooding; microscopic percolation mechanism; micro‐distribution of residual oil; petroleum geology; unsteady water injection;

D O I：

10.3799/dqkx.2023.032

中图分类号：

学科分类号：

摘要：

In view of the large difference in productivity test results between low‐permeability glutenite pay zone and sandstone pay zones, taking the low ‐ permeability glutenite reservoir of Liushagang Formation in Wushi Sag of Beibu Gulf Basin as the main research object, the research on microscopic pore structure, microscopic seepage capacity, microscopic seepage characteristics and strategies for improving water flooding effect to enhance oil recovery was carried out through the indoor core experiments. The results show that the low‐permeability glutenite reservoir has the characteristics of ternary pore structure, and the large pore throat and micro pore throat are more developed, resulting in the seepage characteristics of "high gas permeability, low liquid permeability, and low oil displacement efficiency" and the post‐displacement fluid microscopic distribution characteristics of "large pore throat is rich in injection water, medium throat is rich in remaining oil, and micro pore throat is rich in original bound water". The key to improve the recovery factor of low permeability glutenite reservoir is to improve the microscopic sweep coefficient to increase the utilization rate of medium pore throat crude oil. It is suggested to change wettability by injecting low valent and high salinity water and utilize imbibition role by unsteady water injection to improve water flooding effect and enhance oil recovery. © 2023 China University of Geosciences. All rights reserved.

引用

页码：2960 / 2978

页数：18

共 35 条

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