Additive composition for release of stuck drill pipe
AssigneeTexaco Inc.
InventorClarence O. Walker
Life of this patent
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Abstract
An additive composition effective in the release of stuck pipe in a bore hole during a drilling operation.
Claims10
An improved method of releasing a stuck drill string in the borehole of an underground formation during drilling operations employing an aqueous drilling fluid which comprises contacting said stuck drill string with an additive composition effective to reduce the annular pressure exerted by the drilling fluid against the stuck drill string and to release said stuck drill string, said additive composition being a member selected from the group consisting of 100% by weight polyethylene glycol having a molecular weight of from about 106 to 600;
- an admixture of from 25 to 50% by weight of a polyethylene glycol having a molecular weight of from 150 to 600 with from 75 to 50% by weight of saturated salt water;
- an admixture of 50% by weight of a polyethylene glycol having a molecular weight of from 300 to 600 with 50% by weight of sea water;
- and an admixture of 25% to 50% by weight of a polyethylene glycol having a molecular weight of 300 with from 75 to 50% by weight of sea water.
Dependencies are inferred from the claim text.