Abstract：The influence of change of elastic modulus of enclosing rock is considered on wellbore stability stress under the condition of borehole impenetrability，and the rock nonlinear property influence is corrected on stress according to linear pore elastic thoery. The effective stress formula of Mole-Coulomb creterian and the formula of borehole collapse position are introduced to consider the pore pressure. In formation penetrability and impenetrability condition，the calculation model of borehole collapse pressure and breakdown pressure are set up.
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Deng Jingen1， Wang Jinfeng1， Zhou Jianliang2. CALCULATION MODEL OF BOREHOLE COLLAPSE AND FRACTURE PRESSURE IN PERMEABLE FORMATION. , 2002, 21(S): 2069-2072.
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2002, Vol. 21 
