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  • It has long been the practice in deep wells, where high pressures of the column of drilling mud or other well fluid are exerted upon the string of pipe, to partially fill them with liquid, such as water or drilling fluid, to prevent collapse of the pipe due to the high pressures. (See the US. Patent to T. V. Moore, No. 2,189,919.) To some extent, such loading liquids in the string of piper interfe
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