摘要
针对地应力对深部裸眼井水力压裂效果的影响,基于ANSYS有限元分析软件和弹性力学的知识,建立了裸眼完井的2种有限元计算模型,并对其进行了基于弹性力学的理论计算。结果表明,随着地应力的增加,井筒附近的拉应力逐渐减小,从而导致水力压裂裂纹的起裂难度增加;地应力对水力压裂的裂纹影响还表现在起裂位置和裂纹发展方向上。
Since crustal stress will exert influence on effect of hydro fracture of deep open-hole well, the essay establishes two kinds of finite element calculation models of open-hole completion based on ANSYS finite element analysis software and knowledge of elastic mechanics. And have done theoretical derivation of the models with elastic mechanics. The results show,with the increase of crustal stress, gradually decreasing tensile stress around the well-hole will make crack initiation more difficult; the influence of the distribution of crustal stress on crack is also displayed in position of crack initiation and direction of crack development.
出处
《煤炭技术》
北大核心
2017年第12期130-132,共3页
Coal Technology
基金
国家自然科学基金资助项目(51479108
51379117)
中国博士后基金资助项目(2015M580599)
山东省博士后基金资助项目(201402014)
关键词
地应力
水力压裂
弹性力学
数值模拟
in-situ stress
hydraulic fracturing
elastic mechanics
mathematical simulation
