BHA'S STABILITY MODEL AND ITS CRITICAL LOAD

The auther discovered some significant differences between BHA'S (Bottom hole assembly) stability model and Euler's pressing column model, i. e. Euler's formula may not be reliable in checking the BHA's stabity. So, the formulas of BHA's critical load and critical length were deduced and given by the auhor to fit in with the BHA's loading features as well as to improve the calculating exactness.