INVERTED ACIDIC MICROEMULSION TO TREAT OIL AND GAS FORMATION Russian patent published in 2003 - IPC

FIELD: oil and gas production, reagents utilized to enhance productivity of wells in carbonate and terrigenous collectors. SUBSTANCE: inverted acidic microemulsion to treat oil and gas formation contains dispersed phase-aqueous solution of hydrochloric acid and continuous phase-hydrocarbon fluid in proportion 1/1-3/1, emulsifying agent-chemically modified hydrophobic silica with size of discrete particles from 0.005 to 0.1 mcm and concentration of 0.5-1.5 per cent by mass and emulsion stability controller-ionogenic and nonionogenic surface active substance ( emultal, neonol, oxidized bitumen ) with concentration 0.1-0.3 per cent by mass. Quantity of acidic microemulsion is chosen in accord with recommendations known in industry on basis of 0.5-11.0 cu m per meter of treated thickness. EFFECT: increased stability of inverted acidic microemulsion. 2 tbl