Experiment on enlargement of swept volume by water flooding in high water cut reservoir based on the remaining oil displacement law

doi:10.7623/syxb202303008

Acta Petrolei Sinica ›› 2023, Vol. 44 ›› Issue (3): 500-509.DOI: 10.7623/syxb202303008

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Experiment on enlargement of swept volume by water flooding in high water cut reservoir based on the remaining oil displacement law

Li Yiqiang^1,2, He Shumei³, Zhao Zihao⁴, Wei Pengpeng³, Qi Huan^1,2, Liu Zheyu^1,2, Zhao Yue³, Yu Ying⁵

1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;
2. College of Petroleum Engineering, China University of Petroleum, Beijing 102249, China;
3. Research Institute of Exploration and Development, PetroChina Dagang Oilfield Company, Tianjin 300280, China;
4. CNPC Offshore Engineering Company Limited, Beijing 100028, China;
5. Production Technology Institute, Daqing Oilfield Limited Company, Heilongjiang Daqing 163453, China

Received:2022-07-11 Revised:2023-08-21 Online:2023-03-25 Published:2023-04-06

基于剩余油动用规律的高含水油藏水驱扩大波及体积方式实验

李宜强^1,2, 何书梅³, 赵子豪⁴, 魏朋朋³, 齐桓^1,2, 刘哲宇^1,2, 赵玥³, 于英⁵

1. 中国石油大学(北京)油气资源与探测国家重点实验室北京 102249;
2. 中国石油大学(北京)石油工程学院北京 102249;
3. 中国石油大港油田公司勘探开发研究院天津 300280;
4. 中国石油集团海洋工程有限公司北京 100028;
5. 大庆油田有限责任公司采油工程研究院黑龙江大庆 163453

通讯作者: 刘哲宇,男,1990年3月生,2019年获中国石油大学(北京)博士学位,现为中国石油大学(北京)副教授、硕士生导师,主要从事化学驱提高采收率、岩心及孔隙级别物理模拟等方面的研究工作。Email:zheyu.liu@cup.edu.cn
作者简介:李宜强,男,1972年1月生,2006年获中国科学院渗流流体力学研究所博士学位,现为中国石油大学(北京)研究员、博士生导师,主要从事提高采收率、油气渗流物理模拟实验等方面的研究工作。Email:lyq89731007@163.com
基金资助:
国家自然科学基金项目(No.52074318,No.52004305)资助。

Abstract

Abstract: The majority of medium and high-permeability reservoirs with huge reserves have entered into the high water cut development stage. The economic and effective development of these reservoirs is crucial for the stable production of crude oil in China. Using the computed tomography (CT)technology and the parallel core displacement experiment, the influence of water flooding velocity on microscopic remaining oil displacement and macroscopic sweep efficiency was investigated in terms of the pore throat and core scales. The cyclic water injection method of "injection increase, well shutdown and oil displacement" and the continuous water flooding method were compared in terms of oil displacement efficiency via the three-plate parallel core displacement experiment. The results show that the increase of water flooding velocity can increase the oil displacement efficiency of one-dimensional cylindrical core by 4.4%, and the decrease in the average size of remaining oil clusters is increased with the increase of flow velocity; for heterogeneous cores, an increase of 2-5 times for flow velocity can increase the oil displacement efficiency by 4.5%-6.3%, but the efficiency increment is significantly decreased with the increase of flow velocity; the pressure disturbance established by the cyclic water injection method can effectively enlarge the vertical and plane sweep volume of the parallel plate model, and thus the recovery efficiency is 3.1%higher than that achieved by the continuous water flooding method without increasing the amount of water injection.

Key words: swept volume, microscopic remaining oil, CT scanning, variable velocity displacement, cyclic water injection

摘要： 中国多数中、高渗油藏已进入高含水开发阶段,这部分油藏剩余储量巨大,如何经济有效地开发该类油藏对中国原油稳产至关重要。利用计算机断层扫描(CT)技术和并联岩心驱替实验从孔喉尺度和岩心尺度研究了水驱流速对微观剩余油和宏观波及的影响,基于三平板并联岩心实验对比了"增注、关井、驱替"的周期注水方式与连续水驱的驱油效果。研究结果表明,水驱流速增加使得一维柱状岩心的驱油效率提升了4.4%,剩余油簇平均尺寸下降幅度随着流速的增加而增大;对于非均质岩心,流速增加2~5倍后可提高水驱驱油效果4.5%~6.3%,但增加幅度随着流速的增大而明显减少;周期注水方式建立起的压力扰动可有效扩大并联平板模型纵向和平面的水驱波及体积,在不增加注水量的前提下可比连续注水方式的采收率提高3.1%。

关键词: 波及体积, 微观剩余油, CT扫描, 变速驱替, 周期注水

CLC Number:

TE357

Li Yiqiang, He Shumei, Zhao Zihao, Wei Pengpeng, Qi Huan, Liu Zheyu, Zhao Yue, Yu Ying. Experiment on enlargement of swept volume by water flooding in high water cut reservoir based on the remaining oil displacement law[J]. Acta Petrolei Sinica, 2023, 44(3): 500-509.

李宜强, 何书梅, 赵子豪, 魏朋朋, 齐桓, 刘哲宇, 赵玥, 于英. 基于剩余油动用规律的高含水油藏水驱扩大波及体积方式实验[J]. 石油学报, 2023, 44(3): 500-509.

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Experiment on enlargement of swept volume by water flooding in high water cut reservoir based on the remaining oil displacement law

基于剩余油动用规律的高含水油藏水驱扩大波及体积方式实验

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