Spotting fluid for differential sticking
AssigneeHalliburton Energy Services, Inc.
InventorsJames D. Kercheville, Kenneth W. Pober
Life of this patent
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Abstract
A new composition for a spotting fluid and a method of using such spotting fluid for freeing differential stuck pipe in a subterranean well drilling operation is disclosed. The composition comprises an invert water-in-oil emulsion comprising iso-butyl oleate as its external phase and glycerin as the internal phase. In an altemative embodiment, calcium chloride and water may be substituted for glycerin.
Claims14
A method for freeing differential stuck pipe in a subterranean well-drilling operation with water based drilling fluids, said method comprising:
- (a) determining the density needed for a spotting fluid to facilitate positioning of said spotting fluid at the site of the sticking;
- (b) preparing or obtaining a spotting fluid comprising a water-in-oil invert emulsion comprising iso-butyl oleate as the external phase and glycerin as the internal phase;
- (c) adjusting the density of said spotting fluid with additives such that the needed density may be obtained;
- (d) introducing the spotting fluid into the wellbore;
- (e) allowing said spotting fluid to reach the location of the stuck pipe and to unstick the stick pipe;
- and
- (f) resuming drilling operation without removing the spotting fluid from the well.
A method for freeing differential stuck pipe in a subterranean well drilling operation with water based drilling fluids, said method comprising:
- (a) determining the density needed for a spotting fluid to facilitate positioning of said spotting fluid at the site of the sticking;
- (b) preparing or obtaining a spotting fluid comprising a water-in-oil invert emulsion comprising iso-butyl oleate as the external phase and calcium chloride as the internal phase;
- (c) adjusting the density of said spotting fluid with additives such that the needed density may be obtained;
- (d) introducing the spotting fluid into the wellbore;
- (e) allowing said spotting fluid to reach the location of the stuck pipe and to unstick the stick pipe;
- and
- (f) resuming drilling operation without removing the spotting fluid from the well.
A spotting fluid for freeing differential stuck pipe comprising an invert water-in-oil emulsion comprising iso-butyl oleate as the external phase and glycerin as the internal phase.
A spotting fluid for freeing differential stuck pipe comprising an invert water-in-oil emulsion comprising iso-butyl oleate as the external phase and calcium chloride as the internal phase.
Dependencies are inferred from the claim text.