REAGENT FOR REMOVING ASPHALTENE-TAR-PARAFFIN DEPOSITS AND A METHOD FOR TREATING WELL BOTTOM ZONE UTILIZING IT Russian patent published in 2005 - IPC

FIELD: oil and gas production.

SUBSTANCE: reagent contains fraction obtained in processing of liquid products from oil feedstock pyrolysis via rectification of these products within a temperature range of 28 to 150°C at atmospheric pressure and in presence of polymerization inhibitors; and optionally polyalkylbenzene resin in amount 0.5-5.0% separately or in mixture with α-olefin 2.0-8.0%), or with anionic surfactant (0.05-0.2%). Reagent may also further contain 0.5-5.0% α-olefins and 4.0-10.0% butylbenzene fraction. Method of treating well bottom zone comprises injecting hydrocarbon fluid containing above-indicated hydrocarbons, forcing it into formation with buffer liquid, holding it in bottom zone for a wale, and drawing off dissolution products.

EFFECT: enhanced dissolution of asphaltene-tar-paraffin deposits on oil-field equipment and in well bottom zone and prevented re-precipitation of asphaltenes.

EFFECT: 5 cl, 3 tbl