عنوان مقاله [English]
The wells drilling in various industries such as oil, gas and mining have always been faced with the instability problem and the solving this need to spend a lot of money. The instability of wall of wellbore can be minimized by controlling deformation and failure. In this paper, experimental investigation has been carried out in two different stress conditions on thick-walled hollow cylindrical samples of sandstone, argillaceous limestone and marl using modified Hoek’s cell to predict the deformation and shape of failure in the wall of wellbore.
In the first series of tests, axial stress is constant and confining stress is changing and the second series of tests condition is vice versa. Experimental results indicated that, the deformation and shape of failure strongly depends upon the magnitude and direction of the imposed stress in the wall of well. Also result illustrated that, under constant axial stress condition, the wall of well, for both sandstone and argillaceous limestone specimens, broke out toward inside the wall of wellbore. Under the constant confining stress condition for argillaceous limestone as well as marl specimens, the failure occurred with random distribution in three points, which meet at 120 degrees
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