摘要：The shale gas/oil is playing an important role in the current energy resources. However, the wellbore instability problems bring a high risk to drilling engineering especially in the formation with bedding planes. A normal wellbore stability analysis approach is based on elasticity, which is not enough to recognize the mechanisms. In this paper, the poroelasticity was adopted to present the hydro-mechanical coupling effect in shale formation, meanwhile, the permeability anisotropy which could affect the effective stresses around the well was considered. A three-dimensional finite difference model was developed to simulate arbitrary directional well in shale by the coordinate transformation method. The jointed material model was proposed to character the strength anisotropy and plastic behavior of bedding shale. Additionally, the effects of well trajectory, bedding plane orientation and mud weight on shale wellbore stability were discussed, thus some implications for improving wellbore stability in bedding shale formation were obtained from the proposed model.

关键字：Jointed material; Bedding shale; Wellbore stability; FDM

ISSN号：0920-4105

卷、期、页：卷: 208子辑: B

发表日期：2022-01-01

影响因子：4.345800

期刊分区（SCI为中科院分区）：三区

收录情况：SCIE（科学引文索引网络版）,地学领域高质量科技期刊分级目录（国外T1）

发表期刊名称：JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING

参与作者：Cao Wenke,Liu Hailong,Lin Hai

第一作者：刘伟

论文类型：期刊论文

论文概要：Cao Wenke,刘伟,Liu Hailong,Lin Hai，Effect of formation strength anisotropy on wellbore shear failure in bedding shale，JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING，2022，卷: 208子辑: B

论文题目：Effect of formation strength anisotropy on wellbore shear failure in bedding shale