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[1]曹文科,幸雪松,周长所.基于节理塑性模型的页岩地层水平井井壁稳定性分析*[J].中国安全生产科学技术,2021,17(10):152-157.[doi:10.11731/j.issn.1673-193x.2021.10.023]
　CAO Wenke,XING Xuesong,ZHOU Changsuo.Borehole wall stability analysis of horizontal well in shale formation based on jointed plastic model[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2021,17(10):152-157.[doi:10.11731/j.issn.1673-193x.2021.10.023]
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基于节理塑性模型的页岩地层水平井井壁稳定性分析*
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《中国安全生产科学技术》[ISSN:1673-193X/CN:11-5335/TB]

卷:
17
期数:
2021年10期
页码:
152-157
栏目:
职业安全卫生管理与技术
出版日期:
2021-10-31

文章信息/Info

Title:
Borehole wall stability analysis of horizontal well in shale formation based on jointed plastic model
文章编号:
1673-193X(2021)-10-0152-06
作者:
曹文科; 幸雪松; 周长所
（1.常州大学 石油工程学院，江苏 常州 213164；
2.中海油研究总院有限责任公司，北京 100028）
Author(s):
CAO Wenke;  XING Xuesong;  ZHOU Changsuo
(1.School of Petroleum Engineering,Changzhou University,Changzhou Jiangsu 213164,China；
2.CNOOC Research Institute Co.,Ltd.,Beijing 100028,China)
关键词:
页岩; 水平井; 各向异性; 节理材料
Keywords:
shale;  horizontal well;  anisotropy;  jointed material
分类号:
X937
DOI:
10.11731/j.issn.1673-193x.2021.10.023
文献标志码:
A
摘要:
为研究层理页岩地层中水平井井壁失稳机理，基于流固耦合理论，考虑地层渗透率和强度各向异性，运用节理材料模型对水平井井周塑性失稳区域分布规律进行数值分析。结果表明：钻井液流体侵入导致井周孔隙压力分布呈各向异性，页岩水平井井周破坏形态为四角形状，且随时间增加逐渐向地层内部延伸形成剪切带；在考虑井壁渗透情况下，增大钻井液密度并不能显著改善页岩井壁失稳状况，加强钻井液封堵性对维护井壁稳定具有重要作用。
Abstract:
In order to study the borehole wall instability mechanism of horizontal well in the bedding shale formation,the fluid-solid coupling theory was applied,considering the anisotropy of formation permeability and strength,,the numerical analysis on the distribution laws of plastic instability area around the horizontal well was conducted based on the jointed material model.The results showed that the pore pressure distribution around the well presented the anisotropy.The failure form around the shale horizontal well was the quadrangular shape,which would extend into the formation over time to form a shear zone.Considering the permeation of borehole wall,increasing the density of drilling fluid could not significantly improve the instability of the shale borehole wall.Strengthening the plugging of drilling fluid had an important role in maintaining the stability of borehole wall.

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备注/Memo

备注/Memo:
收稿日期： 2021-06-12
* 基金项目： 国家自然科学基金项目(51904037)；江苏省高等学校自然科学研究项目 (19KJD440001)
作者简介： 曹文科，博士，讲师，主要研究方向为石油工程岩石力学。
更新日期/Last Update: 2021-11-03