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COLLAPSE PRESSURE AND PRECAUTIONS
FOR STABILITY OF WELLBORE WALL |
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Abstract Instability of wellbore wall is a costly and troublesome problem in drilling operation. The stress formula of wellbore wall is given in this paper according to solid mechanics，and swelling stress properties of shale are also determined by swelling stress test on shale. Safe drilling mud densities are calculated by using Mohr-Coulomb strength criterion. The presented method has been employed in some field with good result.
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Received: 20 June 2003
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