Method of reducing fluid loss in cement compositions which...

Details Method of reducing fluid loss in cement compositions which... Method of reducing fluid loss in cement compositions which...

E - Fixed Constructions

21

B

31/13

E21B 33/13 (2006.01) C04B 24/18 (2006.01) C04B 24/24 (2006.01) C09K 8/46 (2006.01) E21B 21/00 (2006.01)

Patent

CA 1280586

METHOD OF REDUCING FLUID LOSS IN CEMENT COMPOSITIONS WHICH MAY CONTAIN SUBSTANTIAL SALT CONCENTRATIONS Abstract of the Disclosure Cementing compositions having improved fluid loss capabilities for use in oil, gas, water and other well cementing operations are disclosed. Such compositions are comprised of water, hydraulic cement and a fluid-loss addi- tive comprising a graft polymer comprised of a backbone of lignin, lignite, derivatized cellulose and various synthetic polymers selected from the group consisting of polyvinyl alcohol, polyethylene oxide, polypropylene oxide and polyethyleneimine. The grafted pendant groups comprise at least one member selected from the group of homopolymers, copolymers and terpolymers of 2-acrylamido-2-methylpropane- sulfonic acid, acrylonitrile, N,N-dimethylacrylamide, acry- lic acid, N,N-dialkylaminoethylmethacrylate and their salts. The backbone comprises from about 5 to about 95 percent by weight of the graft polymer, and the pendant groups can comprise from about 5 to about 95 percent by weight of the graft polymer.

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