页岩应力敏感实验与机理

doi:10.7623/syxb201502012

石油学报 ›› 2015, Vol. 36 ›› Issue (2): 224-231,237.DOI: 10.7623/syxb201502012

页岩应力敏感实验与机理

张睿, 宁正福, 杨峰, 赵华伟

中国石油大学油气资源与探测国家重点实验室中国石油大学石油工程教育部重点实验室北京 102249

收稿日期:2014-08-21 修回日期:2014-12-17 出版日期:2015-02-25 发布日期:2015-02-05
通讯作者: 宁正福,男,1965年10月生,1987毕业于华东石油学院采油专业,2002年获石油大学(北京)油气田开发专业博士学位,现为中国石油大学(北京)教授、博士生导师,主要从事油气藏工程和非常规油气开发方面研究。Email:nzf@cup.edu.cn
作者简介:张睿,男,1986年1月生,2009年获中国石油大学(北京)学士学位,现为中国石油大学(北京)油气田开发工程专业博士研究生,主要从事非常规油气开发方面研究。Email:vvvbst2005@163.com
基金资助:
国家自然科学基金项目(No.51274214)、教育部科学技术研究重大项目(No.311008)和高等学校博士学科点专项科研基金项目(20120007110012) 资助。

Shale stress sensitivity experiment and mechanism

Zhang Rui, Ning Zhengfu, Yang Feng, Zhao Huawei

State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum;Key Laboratory of Petroleum Engineering of the Ministry of Education, China University of Petroleum, Beijing 102249, China

Received:2014-08-21 Revised:2014-12-17 Online:2015-02-25 Published:2015-02-05

摘要/Abstract

摘要：

为了研究页岩渗透率的应力敏感现象及其机理,从毛细管、平板裂缝和双重孔隙介质的渗透率应力敏感机理出发,得到了多孔介质渗透率应力敏感系数的通用表达式,并结合下志留统龙马溪组、下寒武统牛蹄塘组页岩岩心的覆压孔渗联测实验,分析了页岩应力敏感的机理。实验结果表明:渗透率应力敏感系数为孔渗幂指数与孔隙压缩系数的乘积,孔渗幂指数表示孔隙的几何特征,孔隙压缩系数反映岩石力学参数和孔隙形状的影响。页岩岩心微裂缝较发育,微裂缝尺度与孔隙尺度相当的岩心孔渗幂指数小于3,微裂缝尺度远大于孔隙尺度岩心的孔渗幂指数大于3;与砂岩相比,实验所用页岩具有较低的孔渗幂指数,但孔隙压缩系数较高,因此页岩的应力敏感较强。

关键词: 页岩, 应力敏感, 孔渗幂指数, 孔隙压缩系数, 微裂缝

Abstract:

To study the stress sensitivity phenomenon and mechanism of shale permeability, a common expression of the stress sensitivity coefficient of porous medium permeability was obtained based on the permeability stress sensitivity mechanism of capillary, planar crack and dual porosity media. In combination with overburden-pressure porosity-permeability experiments of shale cores in Longmaxi Formation and Niutitang Formation, the mechanism of shale stress sensitivity was analyzed in this study. The experimental results indicate that the permeability stress sensitivity coefficient is the product of porosity-permeability power exponent and pore compressibility, of which porosity-permeability power exponent represents the geometric characteristics of pores, and pore compressibility reflects the influence of rock mechanics parameters and pore shapes. Micro-cracks are relatively developed in shale cores, and the porosity-permeability power exponent of core with micro-crack size equivalent to pore size is less than 3, while that with micro-crack size much larger than pore size is greater than 3. Compared with sandstone, the shale for experiments has a lower porosity-permeability power exponent, but higher pore compressibility, leading to stronger shale stress sensitivity.

Key words: shale, stress sensitivity, porosity-permeability power exponent, pore compressibility, microcrack

中图分类号:

TE312

张睿, 宁正福, 杨峰, 赵华伟. 页岩应力敏感实验与机理[J]. 石油学报, 2015, 36(2): 224-231,237.

Zhang Rui, Ning Zhengfu, Yang Feng, Zhao Huawei. Shale stress sensitivity experiment and mechanism[J]. Acta Petrolei Sinica, 2015, 36(2): 224-231,237.

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页岩应力敏感实验与机理

Shale stress sensitivity experiment and mechanism

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