DEVELOPMENT METHOD FOR OIL AND GAS WELLS Russian patent published in 2014 - IPC E21B43/27 E21B43/22 C09K8/74 C09K8/94 

FIELD: oil and gas industry.

SUBSTANCE: invention is referred to oil and gas industry. In the method for development of oil and gas wells, which includes treatment of the bottomhole zone by emulsified acid injection and process aging, displacing fluid, parting fluid of high viscosity and emulsified acid are injected in sequence to the well equipped with flow column; at that foamed acid is used as emulsified acid and it is prepared by aeration of the design volume of foam-forming emulsion equal to the well volume at drilling-in interval. The foam-forming emulsion contains (wt %): diesel fuel 25.0; salt KCl 10.0; neonol surfactant AF 9-12 1.0-1.5; hydrochloric acid HCl 10.0, water - the remaining part. Aeration degree of the foam-forming emulsion is regulated on the basis of maximum permitted depression at the roof depth of the productive stratum. Foamed acid is injected through tubular annulus to the drilling-in interval, then foamed acid is flushed to the productive stratum by displacing fluid, at that between supplies of displacing fluid and foamed acid the parting fluid is supplied with high viscosity of at least 120 CP, thereafter excess pressure to the bottomhole zone is generated in tubular annulus of the well and tubing with periodicity ensuring creation of at least three cycles of depression and repression to the stratum, at that process aging takes at least three hours in each depression and repression cycles until influx of the reservoir fluid is obtained in depression cycle.

EFFECT: improving efficiency in development of oil and gas wells and increasing their productivity.

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