Phillips Petroleum Company

George G Dixon

Wayne S Stewart

Bharat B Patel

Robert M Parlman

Billy L Swanson

John M Elsen

A water based drilling fluid composition and an additive for water based drilling fluid compositions having as components poly(N-vinyl-2-pyrrolidone/sodium 2-acrylamido-2-methylpropane sulfonate) and ferrous sulfate useful in controlling high temperature water loss in drilling a well to recover oil and gas from a subterranean formation in a hostile environment and their methods of use.

Drilling mud additive comprising ferrous sulfate and

A novel organophilic clay suspension medium prepared by admixing an organophilic clay with a hydrocarbon oil and an activator selected from the group consisting of phenyl hydroxyalkyl ethers and phenylalkanols. Optionally water may be added to the admixture for further improving the suspension medium.

Organophilic clay suspension medium

A drilling fluid additive is disclosed which will prevent water loss into subterranean formations during the drilling of oil and gas wells in hard brine environments. The drilling fluid additive comprises a hydrocarbon, an anionic surfactant, an alcohol, a sulfonated asphalt, a biopolymer, and optionally an organophilic clay, poly(N-vinyl-2-pyrrolidone-co-sodium-2-acryamido-2-methylpropane sulfonate, and water.

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Bartlesville, OK, United States of America

George G Dixon