The effect of oil spotting on differential pressure sticking of drill pipe was studied by simple apparatus.
As a result, it was found that a sodium dialkyl sulf osuccinate was the most effective wetting agent, and the wetting agent promoted oil coating (wetting) on the surface of mud's solids and drill tools.
Therefore, 1) Oil plus wetting agent reduced the adhesive force between filter cake and drill pipe, 2) As the material displaced the water at this contact, differential pressure approached zero.
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