BOTTOMHOLE FORMATION ZONE TREATMENT COMPOSITION Russian patent published in 2003 - IPC

FIELD: oil and gas production. SUBSTANCE: composition with increased structural viscosity, increased thermal stability, and better wetting capacity, enhancing waterproofness of formation rock and increasing adhesion of composition to rock, containing, wt.%: sodium alkylbenzenesulfonate, 15-35; nonionic surfactant with 6-13 ethylene oxide groups, 3-12; oxyethylated phosphoric acid alkyl ester or its potassium or ethanolamine salt, 1-4; hydrocarbon solvent, 5-15; and sodium alkanesulfonate, to 100%; is supplemented by oil emulsion of anionic-type polymer and water so that summary amount of said components represents 1.0-5.0 wt.%, oil emulsion of polymer 0.5-5.0 wt. %, and water the balance. Composition can additionally contain hydrocarbon in amounts between 5.0-20.0 wt.%. EFFECT: engaged low-drainable or nondrainaible oil-saturated part of formation due to that composition with increased rheological non-Newtonian properties provides effective resistance to injection of composition itself and later to water into high-permeable and well-drainable part of bottom zone. 2 cl, 2 tbl, 2 ex