Water based fluids comprising multivalent salts and low...

Earth boring – well treating – and oil field chemistry – Earth boring – Contains organic component

Reexamination Certificate

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Details

C507S119000, C507S123000, C507S124000, C507S125000, C507S145000

Reexamination Certificate

active

06855671

ABSTRACT:
A drilling system fluid and method of using same. The drilling system fluid comprises water as a continuous phase, an amount of a multivalent metal, and a quantity of a water soluble polyacrylamide copolymer having a charge density of at least about 1%. In a preferred embodiment, the fluid also comprises a second amount of a monovalent salt effective to increase gas hydrate suppression and decrease density when compared to a fluid consisting essentially of only a divalent salt in the absence of the monovalent salt.

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