Shale-stabilizing drilling fluid additives

Details Shale-stabilizing drilling fluid additives Shale-stabilizing drilling fluid additives

1989-03-03

1991-01-29

Suchfield, George A.

Compositions

Leather or fur treating

175 65, C09K 702, E21B 2100

Patent

active

049884506

ABSTRACT:
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.

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