PROCESS OF ISOLATION OF ABSORBING AND WATER-SATURATED STRATA Russian patent published in 1996 - IPC

FIELD: oil industry. SUBSTANCE: hydraulic pulses of pressure differences are formed by successive pumping of portions of air and mud. Then buffer fluid is pumped in which capacity 0.1-0.2% water suspension of surface active substance or its 0.04-0.05 aqueous solution is used. Detergents Aina or Vikhr or sulfanol mixture of sodium salt of alkylbenzolsulfone acid or OП-10-monoalkyl ester of polyethyleneglycol in the amount of 0.1-0.25% of water mass can be used as surface active substance. Grouting mortar is pumped and forced into hole clearance. EFFECT: improved efficiency of isolation process. 2 cl, 1 tbl