为此，推导了钻具在自重作用下失稳的临界钻压及临界失稳长度公式，以便使公式更符合BHA自身的受力特点，提高计算准确性。
SO, the formulas of BHA's critical load and critical length were deduced and given by the hor to fit in with the BHA's loading features as well as to improve the calculating exactness.
通过数理统计的方法，采用多元回归方程建立了压差卡钻压差临界值模型，此模型可以用于指导库车山前构造钻井施工。
By methods of mathematical statistics, we use the multiple regression equation to establish critical value model. The model can be used to guide the drilling in Kuqa's piedmont configuration.
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