COMPOSITION FOR PREVENTING THE FORMATION OF PARAFFIN- ASPHALT RESIDUES Russian patent published in 1994 - IPC

FIELD: oil production. SUBSTANCE: composition contains the following ingredients, % by weight: sodium alkylbenzene sulfonate 10-30; nonionic surfactant having from 6 to 13 hydroxy groups 4-10; hydroxyethylated alkyl phosphate, or a potassium or ethanolamine salt thereof 1-5; hydrocarbon solvent 7.5- 15; C₁-C₃-alkanol 10-20; ethylene glycol or propylene glycol 5-15 and sodium alkane sulfonate for the balance. To prevent the deposition of mineral salts the composition further includes the following ingredients, % by weight: 2-hydroxy-1,3-propylene-diamine of tetramethylphosphonic acid [20% solution (ДПФ-1) or sodium salt (ДПФ-1H) 0.75-1.00. For the preparation of the composition its ingredients are mixed together. EFFECT: increased composition stability and decrease in hydraulic tension of active high-viscosity oils. 2 tbl