RUBBER MIXTURE FOR CUFF OF PACKER DEVICE, SWELLING IN DRILLING FLUID CaCl WITH 26% CONCENTRATION Russian patent published in 2023 - IPC C08L9/00 E21B33/12 C08L7/00 C08L23/16 C08K3/11 C08K3/06 C08K9/10 

FIELD: chemistry.

SUBSTANCE: invention relates to the field of polymers, namely to rubber mixtures; it is intended for the manufacture of cuffs of packer devices operated in hard temperature conditions. A rubber mixture for a cuff of a packer device, operated in a highly concentrated CaCl₂ solution, is described, containing butadiene-nitrile rubber, a dispersion of ethylene-propylene rubber with dispersed chrysotile asbestos, water-swelling polymers dispersed with lactam-containing complex salt, other target additives, and sulfur, in which sulfur is a core of a microcapsule formed in plastisol of polyvinyl chloride with an eutectic melt of ε-caprolactam and derivatives of p-phenylene diamine in certain mass amounts in gelatinized plastisol.

EFFECT: implementation of the invention provides a cuff with fulfillment of operational conditions without deterioration of a complex of physical and mechanical indicators, when using an aqueous CaCl₂ solution with 26 wt.% concentration.

1 cl, 2 dwg, 5 tbl, 12 ex