岩土力学2011，Vol.32Issue(2)：356-362,7.
井底压差对垂直井井底应力场的影响研究
Study of effect of bottom-hole differential pressure on vertical well bottom-hole stress field
摘要
Abstract
Bottom-hole differential pressure is one of the important factors which affect the drilling penetration rate; and it is proved that underbalanced drilling is usually more efficient than conventional drilling.The purpose of the article is to study the effect of bottom-hole differential pressure on the vertical bottom-hole stress field.Based on the of mechanical analysis of the bottom-hole rock, the fluid-solid coupling model with the bottom-hole differential pressure is established under axisymmetric condition and the numerical simulation calculation of the bottom-hole stress field under different differential pressures is calculated with the finite element method.The comparison between the numerical and theoretical solutions and analysis of the stress state of bottom-hole rock to break are carried out.The results show that the numerical solution is consistent with the theoretical solution and the fluid-solid coupling model is reasonable.The bottom-hole rock is divided into three regions: triaxial tension region, biaxial compression region and triaxial compression region.Study of the bottom hole rock stress field under different drilling methods is the theoretical basis for faster and more efficient drilling.关键词
井底压差/流固耦合/有限元方法/应力场/破岩分类
能源科技引用本文复制引用
常德玉,李根生,黄中伟,沈忠厚,田守嶒,史怀忠..井底压差对垂直井井底应力场的影响研究[J].岩土力学,2011,32(2):356-362,7.基金项目
国家重点基础研究发展计划(973)项目(No.2010CB226704)资助. （973）
