Aqueous based drilling fluid

Details Aqueous based drilling fluid Aqueous based drilling fluid

1991-02-22

1992-07-28

Maples, John S.

Earth boring, well treating, and oil field chemistry

Earth boring

Contains organic component

507119, 507120, 507140, 252 8551, 252 8554, 526287, C09K 702, C08F22802

Patent

active

051341182

ABSTRACT:
This invention relates to an improved aqueous based drilling fluid and specifically to a water soluble polymer that imparts desirable performance characteristics to the final drilling fluid. The invention also relates to the method for preparation of the polymer and drilling fluid. The water soluble polymer is especially useful in that it exhibits superior tolerance to divalent cations, salts, solids and elevated temperatures when added to aqueous drilling fluids. The polymer additive is characterized by increased viscosity at low shear rates and improved fluid loss control thereby exhibiting superior rheological and thixotropic properties. The polymer consists of reaction products of sulfonated monomers and monomers added to enhance the functional characteristics of the polymer.

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