循环冲击载荷作用下页岩孔隙结构演化特征

王宇; 翟成; 邵昊; 唐伟; 石克龙

doi:10.3969/j.issn.1006-6535.2023.01.022

特种油气藏 >

2023 , Vol. 30 >Issue 1: 154 - 160

DOI: https://doi.org/10.3969/j.issn.1006-6535.2023.01.022

钻采工程

循环冲击载荷作用下页岩孔隙结构演化特征

王宇 ,
翟成 ,
邵昊 ,
唐伟 ,
石克龙

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1.中国矿业大学,江苏徐州 221116;
2.中国矿业大学煤矿瓦斯治理国家工程研究中心,江苏徐州 221116

王宇(1999—),男,2021年毕业于中国矿业大学安全工程专业,现为该校安全科学与工程专业在读博士研究生,研究方向主要为非常规油气储层燃爆压裂增透及岩石动态力学研究。

收稿日期: 2022-04-07

修回日期: 2022-09-21

网络出版日期: 2023-03-24

基金资助

国家重点研发计划“变革性技术关键科学问题重点专项”子课题“页岩气储层甲烷原位燃爆压裂理论与技术”(2020YFA0711800)

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Evolution Characteristics of Shale Pore Structure Under Cyclic Impact Load

Wang Yu ,
Zhai Cheng ,
Shao Hao ,
Tang Wei ,
Shi Kelong

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1. China University of Mining and Technology, Xuzhou, Jiangsu 221116, China;
2. National Engineering Research Center of Coal Gas Control of China University of Mining and Technology, Xuzhou, Jiangsu 221116, China

Received date: 2022-04-07

Revised date: 2022-09-21

Online published: 2023-03-24

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摘要

为研究循环冲击载荷作用下页岩气储层孔隙结构演化规律,以四川省长宁县五峰组页岩为研究对象,基于霍普金森压杆实验系统与微米CT系统,分别获取低速、中速和高速循环冲击载荷下页岩的动力学响应特征,并对冲击前后页岩孔隙结构进行分析。研究表明:动态冲击应力-应变曲线显示,低速循环冲击岩样动态弹性模量随循环冲击次数的增加不断升高,承载能力逐渐增强;中速及高速循环冲击岩样则呈现先压密后损伤的力学响应特征;提高循环冲击载荷,页岩连通裂隙的表面积、体积及分形维数升高,绝对渗透率上升,表明提高循环冲击载荷可使岩样形成复杂孔隙网络,具备更好的渗流能力;中速及高速循环冲击导致岩样内部孔隙扩展贯通,中速循环冲击岩样的孔隙度较原始岩样提升一倍,孔隙分布的空间离散性增强。该研究可为页岩气储层多级脉冲燃爆压裂工艺的相关研究提供理论支持。

关键词： 页岩; 压裂; 孔隙结构; 循环冲击载荷; 微米CT; 多级脉冲燃爆压裂

本文引用格式

王宇 , 翟成 , 邵昊 , 唐伟 , 石克龙 . 循环冲击载荷作用下页岩孔隙结构演化特征[J]. 特种油气藏, 2023 , 30(1) : 154 -160 . DOI: 10.3969/j.issn.1006-6535.2023.01.022

Abstract

To study the pore structure evolution of shale gas reservoir under cyclic impact load, the shale of Wufeng Formation in Changning County, Sichuan Province, was taken as the study case, and the kinetic response characteristics of shale under cyclic impact load at low, medium and high velocity were worked out based on the Hopkinson bar experimental system and micron CT system, and the shale pore structure before and after impact was analyzed. The study shows that The dynamic impact stress to strain curves show that the dynamic elastic modulus modulus of rock samples under low-velocity cyclic impact increased with the increase of cyclic impact count, and the load-bearing capacity increased gradually; the rock samples were compressed first and then damaged under medium velocity and high velocity cyclic impact, with the increase of cyclic impact load, the surface area, volume and fractal dimension of shale connected fractures were increased and the absolute permeability increased, which indicates that increasing the cyclic impact load can form a complex pore network in the rock samples and enhance the permeability; medium velocity and high velocity cyclic impact could expand and penetrate the pores inside the rock samples, and the porosity of rock samples under medium velocity cyclic impact was doubled compared with the original rock samples, and the spatial dispersion of pore distribution was enhanced. This study can theoretically support the study related to multistage pulse combustion-explosion fracturing of shale gas reservoirs.

Key words： shale; fracturing; pore structure; cyclic impact load; micron CT; multistage pulse combustion-explosion fracturing

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