对油田的实际资料进行计算表明，井壁坍塌压力与井斜度和井斜方位角有关。
Calculation of practical data from oil fields demonstrates that formation sloughing pressure is dependent on deviation Angle and well azimuth.
涠西南地区地质构造复杂，在钻井过程中极易发生井壁坍塌、漏失，甚至发生卡钻事故。
Borehole sloughing, mud losses and pipe sticking were frequently encountered in Weixinan area with formations being geologically complicated.
大位移井井壁坍塌压力随井斜角与井斜方位角的变化规律主要由地层的原地应力状态决定。
And the variation law of the hole collapse pressure of extended reach well along with hole Angle and azimuth mostly decided by the status of the stratigraphic in-situ stress.
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