某海上油田砂岩地层井壁稳定研究及应用

Research and application on wellbore stability of sandstone formation in an offshore oil field

本文应用构造地质力学方法研究了该区域地应力的相对大小和大致方位,并应用井壁崩落椭圆法最终确定了该区块的最大地应力方向,从井壁稳定的力学机理出发,分析定向井井周应力分布规律,对坍塌压力、破裂压力随井斜、方位的分布规律进行了计算分析。

In this paper,the relative magnitude and general orientation of the ground stress in this area are studied by the method of structural geomechanics,and the maximum direction of the ground stress in this area is finally determined by the method of wall caving ellipse.Based on the mechanical mechanism of shaft wall stability,the distribution law of the stress around the directional well is analyzed,and the distribution law of collapse pressure and rupture pressure with the inclination and orientation of the well is calculated and analyzed.