High temperature drilling fluids

Details High temperature drilling fluids High temperature drilling fluids

C - Chemistry, Metallurgy

08

F

31/21, 402/306

C08F 8/32 (2006.01) C09K 8/24 (2006.01)

Patent

CA 1227596

HIGH TEMPERATURE DRILLING FLUIDS Abstract An aqueous drilling fluid suitable for high- temperature use comprising a water base, clay suspended in said base and from about 0.01-25 pounds per barrel total composition of a hydrolyzed terpolymer of maleic anhydride, styrene and a third monomer selected from acrylamide, methacrylamide, acrylic acid or methacrylic acid, the molar ratio of maleic anhydride to styrene to said third monomer being from about 30:10:60 to 50:40:10, and the alkali metal, ammonium and lower aliphatic amine salts thereof, the weight-average molecular weight of said hydrolyzed terpolymer being from about 500-10,000. An improved drilling process wherein such fluids remain flowable at elevated temperatures is also disclosed.

481774

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