摘要：Wellbore stability is affected by thermal and chemical reaction between drilling fluid and pore fluid in formation, in order to analyze the thermal and chemical effect on pore pressure and effective stresses, a generalized plain strain finite element model is developed, the model is also available for any inclined well drilled in transversely isotropic formation and could greatly save computing time comparing to three dimensional model. The results indicate that temperature and solute concentration of drilling fluid states different influence on wellbore stability: though cooling effect of drilling fluid could reduce wellbore shear failure risk by decreasing pore pressure and effective stresses, tensile fracture is easier to form in maximum principle stress direction due to sharply decreased effective compressive tangential stress. Lower solute concentration could increase pore pressure greatly because drilling fluid tends to flow into formation under chemical potential difference, then higher pore pressure significantly decreases effective radial stress in turn, so wellbore “spalling” instability may happen when effective radial stress turns to be tensile. meanwhile, the developed model reveals that Young’s modulus and permeability anisotropy ratios play an important role in the pore pressure and effective stresses distribution for the directional well in transversely isotropic formation, however, the effect of Poisson’s ratio could be ignored.
© 2017 by Korean Society for Rock Mechanics.

卷、期、页：v 2017-May,p346-349

发表日期：2017-01-01

期刊分区（SCI为中科院分区）：无

收录情况：国际学术会议论文集

发表期刊名称：ISRM Young Scholars Symp. Rock Mech., YSS

通讯作者：曹文科

第一作者：邓金根,刘伟

论文类型：会议论文

论文概要：曹文科,邓金根,刘伟，Utilize the fully coupled non-linear chemo-thermo-poroelastic theory to analyze wellbore stability in shale formation，ISRM Young Scholars Symp. Rock Mech., YSS，2017，v 2017-May,p346-349

论文题目：Utilize the fully coupled non-linear chemo-thermo-poroelastic theory to analyze wellbore stability in shale formation