Drilling of subterranean formations with drilling fluids...

Details Drilling of subterranean formations with drilling fluids... Drilling of subterranean formations with drilling fluids...

C - Chemistry, Metallurgy

09

K

31/23

C09K 8/24 (2006.01)

Patent

CA 1063336

ABSTRACT OF THE INVENTION Improved drilling of a well with aqueous drilling fluids is obtained by incorporating within the water phase a polymer obtained as a product of radiation-induced polymerization of acrylamide, methacrylamide, acrylic acid, methacrylic acid, alkali metal salts thereof, or mixtures thereof. Polymerization is preferably carried out in 10-60% aqueous monomer solution with gamma radiation. The aqueous monomer solution, before radiation, preferably contains 25-99% acrylamide and 75-1% sodium acrylate. Drilling fluids containing about 0.01 to about 10% by weight of polymer in the water phase exhibit improved fluid loss control properties. These polymers also impart reduced friction loss properties to the drilling fluid.

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