Use of mono and polyalkylene glycol ethers as agents for the release of differentially stuck drill pipe
AssigneeExxon Chemical Patents Inc.
InventorsIvian G. Keener, John C. Newlove, Robert C. Portnoy, Daniel F. Fehler, Kenneth W. Pober
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Abstract
A formulation suitable for preparation of a spotting pill effective in the release of stuck pipe in a borehole during a drilling operation which formulation contains a mono and/or poly alkylene glycol ether and viscosified sufficiently to make the formulation compatible with a solids weighting material such as barite.
Claims7
An improved method of releasing a stuck drill string in the borehole of an underground formation during drilling operations employing a drilling fluid which comprises contacting the borehole zone contiguous with said stuck drill string with a spotting pill effective to reduce the annular pressure exerted by the drilling fluid against the stuck drill string and to release said stuck drill string, said spotting pill being comprised of an alkylene glycol ether of the class consisting of alkylene glycol ether, poly(alkylene glycol) ether and mixtures thereof.
Dependencies are inferred from the claim text.