COMPOSITION FOR REMOVAL OF ASPHALTENE-RESIN-PARAFFIN DEPOSITS Russian patent published in 2020 - IPC E21B37/06 C09K8/524 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry and can be used for removal and dissolution of asphaltene-resin-paraffin deposits from surface of well and oil-field equipment, in reservoirs and oil-gathering collectors, pressure and main pipelines. Composition contains an aliphatic alcohol, a nonionic surfactant, a hydrocarbon solvent and a neopentylpolyol ester modifier which contains a neopentyl fragment in the molecule, with the following ratio of components, wt %: aliphatic alcohol – 0.1–10, non-ionic surfactant – 0.1–2.0, modifier – 0.5–5, hydrocarbon solvent – the rest. Modifier used is a pentaerythritol base PET-B ether, pentaerythritol ester of SNP 5750, trimethylolpropane basic TMP-ST ether or neopentyl glycol ether and Synast ES 2917 fatty acids. Aliphatic alcohol used is methanol, ethanol, isopropanol or still residue of butyl alcohols. Nonionic surfactant is oxyethylated alkylphenol – neonol AF 9-12 or neonol AF 9-6. Hydrocarbon solvent used is aromatic hydrocarbons FAA, AP, FE, FB, Nefras-A-130/150 and/or aliphatic hydrocarbons Nefras-S2-80/120, petroleum ether 70/100) and/or mixtures thereof.

EFFECT: increased efficiency of removal and destruction of asphaltenes, having a wide range of content of asphaltenes, resins and paraffins, simplified composition and possibility of use at temperatures below minus 50 °C, and compatibility with formation waters.

5 cl, 1 tbl, 8 ex