Composition and method for relief of differential sticking during drilling
AssigneeBaker Hughes Incorporated
InventorsRichard Hodge, William S. Halliday, Thomas Daves, Thomas Carter
Life of this patent
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Abstract
A composition and method for use in freeing differentially stuck pipes is presented, comprising a hydrocarbon, acetic acid and a surfactant. The composition frees stock pipes quickly, thus reducing down-time during the process of drilling a subterranean well.
Claims11
A spotting fluid composition suitable for use in downhole drilling operations in a pill for releasing periodically stuck drill string or casing comprising:
- (a) a hydrocarbon;
- and
- (b) an acid in an amount effective to release periodically stuck drillstring or casing by dissolution of the filter cake, said acid being selected from the group comprising monocarboxylic acids having up to nine carbon atoms, and polycarboxylic acids having up to 20 carbon atoms.
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 comprising:
- (a) a hydrocarbon;
- and
- (b) an acid in an amount effective to release periodically stuck drillstring or casing by dissolution of the filter cake, said acid being selected from the group comprising monocarboxylic acids having up to nine carbon atoms, and polycarboxylic acids having up to 20 carbon atoms.
A spotting fluid composition suitable for use in downhole drilling operations in a pill for releasing periodically stuck drill string or casing comprising:
- (a) a hydrocarbon;
- and
- (b) a hydrocarbon soluble acid, namely acetic acid, in an amount effective to release periodically stuck drillstring or casing.
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 comprising:
- (a) a hydrocarbon;
- and
- (b) a hydrocarbon soluble acid, namely acetic acid, in an amount effective to release periodically stuck drillstring or casing.
Dependencies are inferred from the claim text.