Carboxymethyl guar based drilling fluids

Details Carboxymethyl guar based drilling fluids Carboxymethyl guar based drilling fluids

C - Chemistry, Metallurgy

09

K

31/26

C09K 8/08 (2006.01) E21B 21/00 (2006.01)

Patent

CA 1275793

CARBOXYMETHYL GUAR BASED DRILLING FLUIDS Abstract of Disclosure Disclosed are 1) drilling fluid compositions consisting essentially of an aqueous medium selected from the group consisting of fresh and tap water, natural and synthetic sea water, and natural and synthetic brine, and carboxymethyl guar having a degree of substitution (D.S.) of 0.1 to 0.4; 2) drilling fluid compositions consisting essentially of an aqueous medium selected from the group consisting of fresh and tap water, natural and synthetic sea water, and natural and synthetic brine, a carboxymethyl guar having a D.S. of from 0.1 to 0.4, and a metal salt selected from the group consisting of water-soluble metal carbonates and bicarbon- ates; and 3) drilling fluid compositions consisting essen- tially of an aqueous medium selected from the group consist- ing of fresh and tap water, a carboxymethyl guar having a D.S. of from 0.1 to 0.4, a metal salt selected from the group consisting of water-soluble metal carbonates and bicarbonates, and a noncarbonate polyvalent metal salt.

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