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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。
Grasping the law of formation collapse pressure with well inclination and azimuth under different conditions of ground stress is very important for the stability and safe drilling of directional wellbore. The correlation between the mud pressure and the inclination angle and azimuth between the collapse pressure equivalent of the formation under the four kinds of three-dimensional in-situ stress relations was systematically analyzed by means of numerical simulation. The collapsing pressure in the directional well The law of change. The research results can provide certain reference for the determination of the safe drilling mud density in directional well drilling.