Well drilling and servicing fluids and methods of increasing the

Details Well drilling and servicing fluids and methods of increasing the Well drilling and servicing fluids and methods of increasing the

1997-06-09

1998-09-08

Tucker, Philip

Earth boring, well treating, and oil field chemistry

Earth boring

Contains organic component

507140, 507141, 507145, 507212, 507276, 507277, C09K 702

Patent

active

058045350

ABSTRACT:
A well drilling and servicing fluid comprising a brine having dissolved therein a formate salt selected from the group consisting of potassium formate, cesium formate, and mixtures thereof, a biopolymer viscosifier, and a pre-gelatinized amylopectin derivative, and optionally a bridging agent and magnesium oxide. The amylopectin starch derivative is a crosslinked amylopectin starch (waxy) which has been crosslinked to the extent that the viscosity of an aqueous amylopectin starch suspension undergoing crosslinking is within about 25% to about 60%, preferably from about 25% to less than about 50%, of the maximum viscosity which can be obtained, and gelatinized.
A process of increasing the low shear rate viscosity at ambient temperatures of the aqueous formate brine which comprises adding to the brine a biopolymer and the pre-gelatinized crosslinked amylopectin starch in amounts such that they interact to synergistically increase the low shear rate viscosity of the brine.

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patent: 5629271 (1997-05-01), Dobson, Jr. et al.
patent: 5641728 (1997-06-01), Dobson, Jr. et al.

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