石油勘探与开发2012，Vol.39Issue(4)：475-480,6.
泥页岩井壁稳定流固化耦合模型
A fluid-solid-chemistry coupling model for shale wellbore stability
摘要
Abstract
A fluid-solid-chemistry coupling model is built considering fluid flow and ion transmission induced by shale-drilling fluid system electrochemical potential osmosis, nonlinearity of flow and solute diffusion in shale-drilling fluid system, and solid deformation resulted from fluid flow and ion transmission. The model is used to compute the time-varying pore pressure, stress and damage index in formations around the wellbore of a well. The result shows that the pore pressure and stress are lower without consideration of the diffusion potential induced by ion selective character of shale membrane. The linear model overestimates the pore pressure and stress fields around the sidewall. The damage index reveals that collapse first occurs in formations near the wellbore, the caving pressure increases and changes obviously with time, the fracture pressure reduces but doesn't change significantly with time, and the drilling fluid density window narrows down with time.关键词
泥页岩/化学势/电势/孔隙压力/岩石应力/井眼破坏Key words
shale/ chemical potential/ electric potential/ pore pressure/ rock stress/ wellbore damage分类
能源科技引用本文复制引用
王倩,周英操,王刚,蒋宏伟,刘玉石..泥页岩井壁稳定流固化耦合模型[J].石油勘探与开发,2012,39(4):475-480,6.基金项目
国家科技重大专项"西部山前复杂地层安全快速钻完井技术"(2008ZX05021-001) （2008ZX05021-001）
