C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
31/21
C09K 8/24 (2006.01)
Patent
CA 1328992
TITLE SHALE-STABILIZING DRILLING FLUID ADDITIVES ABSTRACT OF THE INVENTION Additive compositions and aqueous drilling fluids which impart improved wellbore stability in drilling shale formations consisting essentially of one or more water-soluble high molecular weight polymers capable of forming relatively strong nucleophilic sites when treated with base and one or more potassium salts which have sufficient alkalinity to raise the pH of the resultant drilling fluid to above 9.0, but whose anions are relatively weak nucleophiles compared to the polymeric nucleophilic sites.
593842
Carter Thomas Scott
Palmer Charles Francis Jr.
Wingrave James Allan
E. I. Du Pont de Nemours And Company
Sim & Mcburney
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