岩心尺度静态自发渗吸的数值模拟

doi:10.7623/syxb202206010

石油学报 ›› 2022, Vol. 43 ›› Issue (6): 860-870.DOI: 10.7623/syxb202206010

岩心尺度静态自发渗吸的数值模拟

王强¹, 赵金洲¹, 胡永全¹, 赵超能^1,2, 张祯祥³

1. 西南石油大学油气藏地质及开发工程国家重点实验室四川成都 610500;
2. 广西广投能源集团有限公司广西南宁 530201;
3. 中国石油大学(北京)石油工程学院北京 102249

收稿日期:2021-01-31 修回日期:2021-10-02 发布日期:2022-06-28
通讯作者: 赵金洲,男,1962年10月生,1985年获西南石油学院油气田开发工程专业硕士学位,现为西南石油大学教授、博士生导师,主要从事油气田开采和增产技术新理论研究。Email:zhaojz@swpu.edu.cn
作者简介:王强,男,1990年2月生,2021年获西南石油大学博士学位,现为西南石油大学讲师,主要从事非常规储层改造理论与技术研究。Email:swpu_wq@163.com
基金资助:
国家科技重大专项(2016ZX05060)和国家自然科学基金联合基金项目"深层超深层页岩气水平井压裂缝网高效建造理论与方法研究"(No.U21B2701)资助。

Numerical simulation of static spontaneous imbibition at the core scale

Wang Qiang¹, Zhao Jinzhou¹, Hu Yongquan¹, Zhao Chaoneng^1,2, Zhang Zhenxiang³

1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Sichuan Chengdu 610500, China;
2. Guangxi Investment Group Energy Group Co. Ltd., Guangxi Nanning 530201, China;
3. College of Petroleum Engineering, China University of Petroleum, Beijing 102249, China

Received:2021-01-31 Revised:2021-10-02 Published:2022-06-28

摘要/Abstract

摘要： 基于渗流理论、化学势以及嵌入式离散裂缝模型,推导了新的静态渗吸数学模型,模型考虑了毛细管力、重力、溶质浓度差导致的渗透压3种渗吸驱动力对渗吸采油的影响,并利用现有研究验证了模型的准确性。通过数值计算,着重研究了不同驱动机制对渗吸采出程度的贡献,分析了浸泡液矿化度、岩块壁面膜效率、岩块尺寸对采出程度的影响。结果表明:静态渗吸采油过程中,毛细管力、重力以及渗透压都为重要的渗吸驱动力;受多种渗吸驱动力影响,岩块内部含水饱和度呈一定规律变化;早期渗吸中,毛细管力、重力对采出程度的贡献较大;长远来看,渗透压主导的持续渗吸作用对采出程度的贡献也不可忽视。浸泡液矿化度与岩块采出程度呈近线性负相关;岩块尺寸与采出程度非线性负相关;岩块壁面膜效率与采出程度非线性正相关,并且膜效率的增加可以延长高渗透压主导渗吸采油的时长。在水力压裂作业和注水开发过程中,适当降低压裂液和注入流体矿化度值以及增加水力改造裂缝网络复杂程度,可以强化初期渗吸采油效果,缩短渗吸时间,提高最终采收率。

关键词: 静态自发渗吸, 毛细管力, 矿化度, 渗透压, 数值模拟

Abstract: A new mathematical model of static imbibition has been derived based on flow theory, chemical potential, and embedded discrete fracture model. The model considers the effects of three imbibition drivers caused by solute concentration difference, i.e., capillary force, gravity, and osmotic pressure, on imbibition oil recovery. The accuracy of the model has been verified using published studies. Through numerical calculations, this study focuses on the contribution of different driving mechanisms to the imbibition recovery rate, and analyzes the effects of soaking fluid mineralization, rock wall membrane efficiency, and rock block size on the recovery rate. The results show that capillary force, gravity and osmotic pressure are all important driving forces in static imbibition oil recovery; the water saturation inside the rock mass varies in a certain pattern under the influence of various imbibition driving forces; the contribution of capillary force and gravity to the recovery rate is great during early imbibition; in the long run, the contribution of continuous imbibition dominated by osmotic pressure to the recovery rate cannot be ignored. Soaking fluid mineralization is nearly linearly and negatively correlated with the block recovery rate; block size is nonlinearly and negatively correlated with the recovery rate; rock wall membrane efficiency is nonlinearly and positively correlated with the recovery rate, and the increase of membrane efficiency can prolong the duration of imbibition oil recovery dominated by high osmotic pressure. During hydraulic fracturing operation and water injection development, to appropriately decrease the mineralization value of fracturing fluid and injected fluid as well as increase the complexity of hydraulically modified fracture network can enhance the initial imbibition recovery efficiency, shorten the imbibition time, and improve the final recovery rate.

Key words: static spontaneous imbibition, capillary force, mineralization, osmotic pressure, numerical simulation

中图分类号:

TE357

王强, 赵金洲, 胡永全, 赵超能, 张祯祥. 岩心尺度静态自发渗吸的数值模拟[J]. 石油学报, 2022, 43(6): 860-870.

Wang Qiang, Zhao Jinzhou, Hu Yongquan, Zhao Chaoneng, Zhang Zhenxiang. Numerical simulation of static spontaneous imbibition at the core scale[J]. Acta Petrolei Sinica, 2022, 43(6): 860-870.

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岩心尺度静态自发渗吸的数值模拟

Numerical simulation of static spontaneous imbibition at the core scale

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