WATER SWELLING RUBBER MIXTURE FOR PACKER EQUIPMENT Russian patent published in 2018 - IPC C08L9/02 C08L33/26 C08K3/04 C08K3/06 C08K3/22 C08K5/47 E21B33/12 

FIELD: chemistry.

SUBSTANCE: invention relates to water- and oil-swelling rubbers based on butadiene-nitrile rubbers, which can be used in packers and other downhole equipment. Rubber mixture for packer equipment based on butadiene-nitrile rubber con$tains, mass parts: rubber NBR-28 100.0; sulfur 1.5; altax 1.5; zinc oxide 5.0; stearin 2.0; technical carbon P-234 50.0; asbestos fibers 10.0–15.0; cross-linked polyacrylamide POLYSWELL 70.0–100.0; carboxymethylcellulose 10.0–15.0.

EFFECT: invention increases the ability of the rubber composition to swell in concentrated brine and drilling fluids while maintaining satisfactory strength characteristics.

1 cl, 2 tbl