METHOD FOR PROCESSING BOTTOMHOLE ZONE OF FORMATION COMPOSED OF CARBONATE ROCKS WITH OIL RESOURCES COMPLICATED TO EXTRACT Russian patent published in 2006 - IPC E21B43/27 

FIELD: oil and gas extractive industry, in particular, possible use during processing of bottomhole zone of productive formation, composed of carbonate rocks, primarily of porous fractured reservoirs, with hard to extract oil deposits.

SUBSTANCE: method for processing bottomhole zone of formation composed of carbonate rocks with hard to extract oil deposits includes feeding a compound through tubing string into position interval of well filter, aforementioned compound containing hydrochloric acid with hydrocarbon solvent, for which diesel fuel is used, and emulsifier, with following extraction of reaction product of acid with bed rock. In aforementioned compound oil is used as emulsifier with content of tarry pyrobitumen substances within limits 15-20%, in volume 1,5-2,0% of total volume of mixture, with ratios of diesel fuel and hydrochloric acid being 25-35% and 65-75% respectively, while prior to injection of hydrochloric acid into mixture full agitation of oil in diesel fuel is performed first using hydro-dispersive device. Extraction of products of reaction of acid with bed rock is performed by means of swabbing or in accordance to depression-repression wave method.

EFFECT: creation of method for processing bottomhole formation zone using low-component accessible acidic emulsion, not inferior to known analogs in terms of efficiency.

2 cl, 1 ex