页岩储层应力敏感性的时间效应

doi:10.11885/j.issn.1674-5086.2022.10.31.01

西南石油大学学报(自然科学版) ›› 2024, Vol. 46 ›› Issue (1): 53-63.DOI: 10.11885/j.issn.1674-5086.2022.10.31.01

页岩储层应力敏感性的时间效应

康毅力¹, 赖哲涵¹, 陈明君¹, 吴建军², 李兵²

1. 油气藏地质及开发工程全国重点实验室·西南石油大学, 四川成都 610500;
2. 中国石油煤层气有限责任公司工程技术研究院, 陕西西安 710082

收稿日期:2022-10-31 发布日期:2024-02-01
通讯作者: 康毅力,E-mail:cwctkyl@163.com
作者简介:康毅力，1964年生，男，汉族，天津蓟州区人，教授，博士研究生导师，主要从事储层保护理论与技术、非常规天然气和油气田开发地质方向的研究与教学工作。E-mail:cwctkyl@163.com;赖哲涵，1996年生，男，汉族，四川成都人，博士研究生，主要从事储层保护理论与技术、非常规油气开发方向的科研工作。E-mail:775128286@qq.com;陈明君，1988年生，男，汉族，重庆荣昌人，副研究员，博士（后），主要从事储层保护理论与技术、非常规油气开发及高温高压岩石物理等方面的研究与教学工作。E-mail:chenmj1026@163.com;吴建军，1985年生，男，汉族，安徽合肥人，高级工程师，硕士，主要从事煤层气、致密气、页岩气储层改造及开发等方面的研究工作。E-mail:wujj85@petrochina.com.cn;李兵，1992年生，男，汉族，陕西渭南人，工程师，硕士，主要从事煤层气、致密气、页岩气储层改造等方面的研究工作。E-mail:libing0524@petrochina.com.cn
基金资助:
中国石油天然气股份有限公司“十四五”前瞻性基础性技术攻关项目（2021DJ2004）；西南石油大学开放性实验项目（2021KSZ01049）

Time Effects of Stress Sensitivity in Shale Reservoirs

KANG Yili¹, LAI Zhehan¹, CHEN Mingjun¹, WU Jianjun², LI Bing²

1. National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
2. Engineering Technology Research Institute, PetroChina Coalbed Methane Co. Ltd., Xi'an, Shaanxi 710082, China

Received:2022-10-31 Published:2024-02-01

摘要/Abstract

摘要： 有效应力及其作用时间是控制岩石孔隙和裂缝变形的重要外部因素。页岩储层的多尺度孔隙结构特征及孔缝配置关系使得其应力敏感时间效应具有特殊性，然而，以往研究尚未考虑有效应力加载及卸载时间对页岩应力敏感行为的影响。以川南威荣气田龙马溪组页岩气藏为研究对象，钻取不同孔缝发育程度的页岩样品，设计并测试了变有效应力状态下变加载及卸载持续稳定时间对岩样渗透率的影响实验。结果表明：1) 有效应力从5 MPa升至35 MPa时，微裂缝岩样和基块岩样渗透率分别降低了66.82%和27.19%，卸载过程中渗透率恢复率为74.73%和79.82%。页岩渗透率越低，有效应力滞后效应越显著；2) 恒定有效应力加载持续稳定时间从2.5 h延长至10.0 h，应力敏感系数增加3.76%~80.17%，且当有效应力较小时的时间效应更显著。研究认为，页岩组分及多尺度孔缝结构是导致其孔缝变形行为差异性的主因。基于实验研究结果，推荐页岩样品老化处理为6.0 h，提出了优化页岩储层敏感性评价实验方案和优化气井工作制度的建议。

关键词: 页岩, 应力敏感, 多尺度孔缝结构, 时间效应, 有效应力, 渗透性

Abstract: The effective stress and its action time are important external factors controlling the deformation of pores and fractures in rock. The characteristics of multi-scale pore structure and pore fracture configuration make the stress sensitive time effect of shale reservoirs special. However, the influence of effective stress loading and unloading time on the stress sensitive behavior of shale reservoirs has not been considered in previous studies. In this paper, the Longmaxi Formation shale gas reservoir in Weirong Gas Field, south Sichuan is taken as the research area. The shale samples with different development degrees of pores and fractures are drilled, and the experiment of the influence of variable loading and unloading sustained stability time on permeability of rock samples under variable effective stress is designed and tested. The results show that: 1) when the effective stress loading from 5 MPa to 35 MPa, the permeability of micro fracture sample and matrix sample decreases by 66.82% and 27.19%, respectively, 74.73% and 79.82% recovery rate of permeability during unloading. The lower the shale permeability is, the more significant the effective stress hysteresis effect is. 2) when the continuous stability time of constant effective stress loading is extended from 2.5 h to 10.0 h, and stress sensitivity index increases by 3.76%~80.17%. and the time effect is more significant when the effective stress is small. It is concluded that shale composition and multi-scale pore structure are the main reasons for the difference of pore deformation behavior. Based on the experimental results, the effective stress loading pretreatment time of shale samples is determined to be 6 h, and some suggestions are put forward to optimize the experimental scheme of shale reservoir sensitivity evaluation and optimize the working system of gas wells.

Key words: shale, stress sensitivity, multi-scale pore and fracture structure, time effect, effective stress, permeability

中图分类号:

TE122.2

康毅力, 赖哲涵, 陈明君, 吴建军, 李兵. 页岩储层应力敏感性的时间效应[J]. 西南石油大学学报(自然科学版), 2024, 46(1): 53-63.

KANG Yili, LAI Zhehan, CHEN Mingjun, WU Jianjun, LI Bing. Time Effects of Stress Sensitivity in Shale Reservoirs[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2024, 46(1): 53-63.

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页岩储层应力敏感性的时间效应

Time Effects of Stress Sensitivity in Shale Reservoirs

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