团簇效应对裂缝连通性的影响

袁飞宇; 唐潮; 张超; 付亚飞; 陈波

doi:10.3969/j.issn.1006-6535.2023.06.014

特种油气藏 >

2023 , Vol. 30 >Issue 6: 107 - 113

DOI: https://doi.org/10.3969/j.issn.1006-6535.2023.06.014

油藏工程

团簇效应对裂缝连通性的影响

袁飞宇 ,
唐潮 ,
张超 ,
付亚飞 ,
陈波

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1.中国石化西北油田分公司,新疆库尔勒 841000;
2.成都理工大学,四川成都 610059;
3.非常规油气开发教育部重点实验室(中国石油大学(华东)),山东青岛 266580;
4.中国石油大学(华东),山东青岛 266580

袁飞宇(1986—),男,高级工程师,2010年毕业于西南石油大学资源勘查专业,现主要从事碳酸盐岩油藏工程方面的研究工作。

收稿日期: 2022-11-25

修回日期: 2023-09-25

网络出版日期: 2024-01-19

基金资助

中国石化科研项目“岩溶系统描述及空间结构井网构建研究”(P20042-1)

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Influence of the Cluster Effect on the Fracture Connectivity

Yuan Feiyu ,
Tang Chao ,
Zhang Chao ,
Fu Yafei ,
Chen Bo

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1. Sinopec Northwest Oilfield Company, Korla, Xinjiang 841000, China;
2. Chengdu University of Technology, Chengdu, Sichuan 610059, China;
3. Key Laboratory of Unconventional Oil and Gas Development, Ministry of Education (China University of Petroleum (East China)), Qingdao, Shandong 266580, China;
4. China University of Petroleum (East China), Qingdao, Shandong 266580, China

Received date: 2022-11-25

Revised date: 2023-09-25

Online published: 2024-01-19

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摘要

针对塔河油田缝洞型油藏非均质性强、裂缝分布无序复杂,需充分考虑裂缝网络展布的随机性及非均质性的问题,采用逾渗理论将裂缝网络简化为一随机无序系统,进而对具有团簇行为的裂缝网络的连通性进行研究。结果表明:随着裂缝网络由各向同性向各向异性转化,连通性先增大再减小;裂缝网络局部团簇效应会影响逾渗阈值,随着团簇效应的增加,逾渗阈值逐渐减小,说明团簇效应可以改善局部网络连通性,损害整体连通性。该方法在塔河A单元开发过程中进行应用,通过井网构建、井网调流势及井组注氮气驱油等方案,单元采收率由15.6%升至20.7%,新增可采储量超过42.1×10⁴t。该研究对于塔河油田缝洞型油藏提高采收率工作具有重要意义。

关键词： 逾渗理论; 分形理论; 团簇效应; 裂缝网络连通性

本文引用格式

袁飞宇 , 唐潮 , 张超 , 付亚飞 , 陈波 . 团簇效应对裂缝连通性的影响[J]. 特种油气藏, 2023 , 30(6) : 107 -113 . DOI: 10.3969/j.issn.1006-6535.2023.06.014

Abstract

In response to the problem that it is necessary to fully consider the randomness and non-homogeneity of the fracture network layout due to the strong non-homogeneity and disordered and complex distribution of fractures of the fractured-vuggy reservoirs in Tahe Oilfield, the percolation theory was adopted to simplify the fracture network into a random and disordered system, and then the connectivity of fracture networks with the clustering behavior was investigated. The results show that as the fracture network transforms from isotropic to anisotropic, the connectivity increases and then decreases; the local clustering effect of the fracture network affects the percolation threshold, which decreases with the increase of the clustering effect, suggesting that the clustering effect can improve the local network connectivity but impair the overall connectivity. The method was applied in the development of Tahe unit A, and the unit recovery rate increased from 15.6% to 20.7%, and the new recoverable reserves were more than 42.1×10⁴t by formulating programs such as well network construction, well network flow potential adjustment, and oil displacement of well group through injection of nitrogen. This study is of great significance to the recovery enhancement of fractured-vuggy reservoirs in Tahe Oilfield.

Key words： percolation theory; fractal theory; clustering effect; fracture network connectivity

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