METHOD OF INHIBITING FORMATION OF ASPHALT-RESIN-PARAFFIN DEPOSITS Russian patent published in 2025 - IPC E21B37/06 E21B43/267 C09K8/524 C09K8/536 C09K8/80 

FIELD: obtaining oil from wells.

SUBSTANCE: method for inhibiting the formation of asphalt-resin-paraffin deposits includes treating oil wells with an inhibitor of the formation of asphalt-resin-paraffin deposits by adding, during hydraulic fracturing, ceramic spherical particles to a proppant pack, having physical-chemical and physical-mechanical properties, size and shape, presented to the proppant used during hydraulic fracturing, with open porosity of up to 30%, saturated with a solution of a copolymer of ethylene and vinyl acetate in o-xylene and dried, and subsequent slow release of said copolymer into the ambient stream while washing said porous particles with subsequent filtration of oil through the proppant pack. Solution used is a solution in o-xylene with weight concentration of not more than 14% sevilen grade 11808-340 with content of vinyl acetate from 26 to 30%, wherein first said particles are dried to constant mass and complete removal of liquids from their pores, then dried particles are evacuated at pressure less than 1000 Pa until complete removal of air from their pores, then performing supply of said solution of sevilen into a container with said particles without releasing discharged pressure, so that level of said solution of sevilen was above surface of said particles, then said particles are after-saturated at atmospheric pressure with subsequent re-saturation at high pressure of not more than 100 atm for at least 8 hours, o-xylene solvent is then evaporated from said particles while stirring constantly.

EFFECT: improving operating efficiency of wells complicated with intensive formation of asphalt-resin-paraffin deposits by improving rheological properties of oil due to ARPD inhibition.

1 cl, 6 dwg, 5 tbl