C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
31/9
C09K 8/514 (2006.01) C09K 8/40 (2006.01) E21B 43/22 (2006.01)
Patent
CA 1248337
-19- ABSTRACT OF THE DISCLOSURE Nondamaging treating fluids containing sparingly soluble hydrated borate bridging agents having a particle size distribution within the range about 1 micron to about 2000 microns are disclosed. The treating fluids comprise an aqueous salt solution having a density from about 1.0 g/cm3 to about 1.20 g/cm3, the hydrated borate bridging agent in an amount sufficient to bridge and seal off a subterranean formation contacted by the treating fluid, and a viscosifier and suspension additive in an amount to provide sufficient viscosity to maintain the bridging agent in suspension. A fluid loss control addi- tive may be added to enhance the fluid loss control and formation sealing capacity of the treating fluid. Well treatments may be practiced by pumping or discharging the fluid or a slug or pill of the fluid into an oil, gas, water, injec- tion or storage well where operations are to be conducted in which it is desired to temporarily plug the permeable zone while such opera- tions are carried out. Thereafter, the hydrated borate bridging agents are removed by connate water from the permeable zone, or by a nonsaturated brine wash, or ordinary water or acid circulated in the well.
489858
Kirby Eades Gale Baker
Texas United Chemical Corporation
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