Method of using gelled aqueous well treating fluids
AssigneeHalliburton Company
InventorJimmie L. Watson
Life of this patent
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Abstract
Gelled aqueous fluids, solid blends for forming such fluids and methods of using the fluids for treating wells are provided. The gelled fluids are stable over a broad temperature range and are comprised of water, a first hydratable polymer for increasing the viscosity of the fluid to a desired level at temperatures within a first lower range and a second hydratable polymer for maintaining the viscosity of the fluid at temperature within a second higher range.
Claims20
In a method of introducing a treating fluid into a well separated from an incompatible fluid therein by a spacer fluid, the improvement comprising:
- introducing the treating fluid into the well preceded by an aqueous spacer fluid having a stable viscosity over a broad temperature range comprising:
- water;
- a first hydratable polymer for increasing the viscosity of said spacer fluid to a desired level at temperatures within a first lower range wherein said first hydratable polymer is selected from the group consisting of guar gum and derivatives thereof, cellulose and derivatives thereof and mixtures of such polymers;
- and
- a second hydratable polymer comprising locust bean gum for maintaining the viscosity of said spacer fluid at said desired level at temperatures within a second higher range.
In a method of introducing a cement composition into a well containing a drilling fluid incompatible with the cement composition wherein the cement composition and drilling fluid are separated by a spacer fluid compatible with both, the improvement comprising:
- introducing an aqueous spacer fluid into the well between the cement composition and the drilling fluid comprised of:
- water;
- an angular particulate material for scrubbing surfaces in said well;
- a first hydratable polymer for increasing the viscosity of said spacer fluid at temperatures within a first lower range to a level whereby said angular particulate material is substantially suspended in said fluid;
- and
- a second hydratable polymer for maintaining the viscosity of said spacer fluid at a level whereby said angular particulate material is substantially suspended in said fluid at temperatures within a second higher range.
In a method of introducing a cement composition into a well containing drilling fluid incompatible with said cement composition wherein said cement composition and drilling fluid are separated by a spacer fluid compatible with both, the improvement comprising:
- introducing an aqueous spacer fluid into the well between the cement composition and drilling fluid comprised of:
- water;
- an angular particulate material having a specific gravity below about 2 and a size distribution in the range such that a major portion of said material passes through a size 14 mesh screen (U.S. Sieve Series) and is retained on a size 20 mesh screen present in said spacer fluid in an amount in the range of from about 300 to about 500 lbs/1000 gals. of water;
- sodium carboxymethylhydroxyethylcellulose present in said fluid in an amount in the range of from about 30 to about 51 lbs/1000 gals. of water;
- hydroxypropyl guar present in said fluid in an amount in the range of from about 15 to about 25 lbs/1000 gals. of water;
- and
- locust bean gum present in said fluid in an amount in the range of from about 15 to about 25 lbs/1000 gals. of water.
Dependencies are inferred from the claim text.