Chemically modified lignite

Details Chemically modified lignite Chemically modified lignite

C - Chemistry, Metallurgy

09

K

400/1400, 31/9

C09K 8/24 (2006.01) C08F 220/58 (2006.01)

Patent

CA 1257424

Abstract A method of improving high temperature fluid loss and rheology stabilization of high calcium brine clay-containing oil well drilling fluids which comprises adding thereto a stabilizing amount of a water-soluble terpolymer composition comprising: Image said composition containing brown coal or modified brown coal in an amount ranging between 5-95% with the brown coal or modified brown coal having been present during the polymerization of the water-soluble polymer.

523948

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