PROCESSING OF HOLE-BOTTOM AREA OF CAVERNOUS FRACTURE TERRIGENOUS BED WITH NEAR GAS-WATER CONTACT Russian patent published in 2014 - IPC E21B43/27 E21B43/22 C09K8/74 

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to oil and gas industry. In compliance with this method, CTU flexible pipe is lowered in unplugged well to processed bed roof to inject there through the methanol in amount of 1-2 m³ per 1 m of processed interval and back gasified hydrocarbon emulsion in amount of 2-3 m³ per 1 m of processed interval that contains the following components in wt %: oil - 75-85, 18-20% solution of hydrochloric acid, non-ionic surfactant, disolvan - 0.5-1.5, water making the rest. Emulsion is injected into the bed to the depth of mudded zone including fractures and pores and pores of rocks in well bottom zone but not over 1.5 m in radius, by inert nitrogen. Said emulsion is held for its reaction with mudding particles in perforation interval, in fractures and pores of said well bottom zone for 2-4 hours. Then, gas inflow from the bed is initiated to remove reaction wastes along with gas to fuel spray. Then, the well is operated to design mode to put the well in operation.

EFFECT: prevented destruction of well bottom zone.

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