THERMOSTABLE COMPOSITIONS OF PARAFFIN FORMATION INHIBITORS Russian patent published in 2020 - IPC C09K8/524 E21B37/06 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to heat-stable compositions of paraffin deposition inhibitors. Wax paraffin formation inhibitor concentrate composition to reduce paraffin or wax deposits in crude oil, containing from about 1 wt % up to 20 wt % polymer-paraffin formation inhibitor and from about 1 wt % up to 99 wt % non-polymeric glycol ether compound or mixture thereof, wherein the composition is a stable non-aqueous composition which is fluid at −40 °C, and wherein said paraffin formation inhibitor polymer contains an alkylphenol/formaldehyde or copolymer, containing residues of one or more alpha-olefin monomers and maleic anhydride monomer, where one or more of the alpha-olefin monomers and the maleic anhydride monomer are described by the given formulas. A method of using a paraffin formation inhibitor to a crude oil source, involving: forming a non-aqueous liquid composition containing a non-polymeric glycol ether compound and from about 1 wt % up to 20 wt % said paraffin formation inhibiting polymer, containing an alkylphenol/formaldehyde copolymer or a copolymer containing residues of one or more alpha-olefin monomers and a maleic anhydride monomer, wherein composition is fluid at −40 °C; storage of composition in closed container at first temperature between about −40 °C and 60 °C, removing composition from container at second temperature between about −40 °C and 60 °C and use of composition to source of crude oil, wherein extraction and use are performed by pouring or pumping. Use of said composition for inhibiting paraffin deposition in a crude oil source. Source of crude oil containing said composition, wherein the composition is present in the crude oil source in an amount sufficient to provide crude oil in the source from about 5 ppm to 10000 ppm of the paraffin polymer inhibitor polymer.

EFFECT: technical result is reduction of paraffin wax or wax in tanks for storage or transportation of crude oil.

17 cl, 14 tbl, 139 ex