SEALING PASTE FOR SHUTOFF VALVES Russian patent published in 2015 - IPC C09K3/10 

FIELD: oil and gas industry.

SUBSTANCE: invention can be used in oil and gas industry. Sealing paste for the shutoff valves contains the following components in weight parts, namely, polydimethyl siloxanes with viscosity from 5 to 100000 cSt, transformer oil VG, 20% solution of low-molecular rubber, organic-silicon oligomer 132-339, 10% solution of high-molecular rubber in VG oil, aerosil, bentonite, organobentonite, pearlite, mica, white soot, polyethyl siloxane liquid PES-5, organic-silicon block copolymer, α-olefins from C₁₂-C₁₄, C₁₆-C₁₈ row and/or tetramer of propylene, microtalc, colloidal graphite, titanium dioxide (rutile), alkyl phosphate, tricresyl phosphate.

EFFECT: paste is characterised by penetration values at 20°C - 100-220, at minus 60°C - 40-60, has colloidal stability 1,5-2,5, contains maximum 0,05% of water, is stable against components of gas condensate in wide range of temperatures, is characterised by low penetration dependence on temperature.

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