不同地应力条件下定向井地层坍塌压力变化规律分析  

The Formation Collapse Pressure Change in Directional Well with Different Stress Conditions

作　　者：刘之的[1] 

机构地区：[1]西安科技大学地质与环境学院,陕西西安710054

出　　处：《天然气地球科学》2010年第1期107-111,共5页Natural Gas Geoscience

基　　金：西安科技大学博士后科研启动基金项目(编号:A5030720)资助

摘　　要：掌握不同地应力条件下地层坍塌压力随井斜角和方位角变化的规律,对于定向井井壁稳定和安全钻井至关重要。采用数值模拟手段对三向地应力的4种大小顺序关系情况下地层坍塌压力当量泥浆密度与井斜角和方位角之间的相互关系进行了系统分析,弄清了定向井中地层坍塌压力的变化规律。其研究成果可为定向井钻井安全泥浆密度的确定提供一定的参考依据。It＇s very important for the directional well drilling stability and security, to know the changes of the formation collapse pressure with the well deviation and azimuth angle under different formation stress conditions. Here we analyze the relationship among equivalent mud density of formation collapse pressure, well deviation and azimuth angle, by numerical simulation of formation stress for four cases. And the changes of formation collapse pressure in the directional wells are also discussed. The result will provide a reference to determine the security mud density in directional well drilling.

关 键 词：定向井 地应力 坍塌压力 变化规律 

分 类 号：TE21[石油与天然气工程—油气井工程]