COMBINED WELL STIMULATION METHOD Russian patent published in 2006 - IPC E21B43/263 

FIELD: oil industry, particularly methods for stimulating production by forming crevices or fractures using explosives.

SUBSTANCE: method involves thermogaschemical and pressure reservoir treatment by means of gas generator. Gas generator comprises cylindrical uncased charge with central round channel and is made of solid-fuel material and is connected to logging cable. The above action is applied by combusting solid-fuel cylindrical charge in productive reservoir interval along with gunpowder gas pressure accumulation in central charge channel. Then combustion energy is transferred to productive reservoir. To remove residual charge components additional charge is used at the end of main charge burning. The additional charge is provided with segments projecting from opposite cylindrical surface sides and parallel to central channel axis. Longitudinal grooves are created in the segments. Distance between the grooves is equal to outer cylindrical charge part diameter. Rate between charge perimeter and each projecting segment base is (6÷9):1.

EFFECT: increased efficiency of well stimulation due to applying combined thermogaschemical, vibro-wave and pressure bottomhole area action with the use of gunpowder charge free of residual dying fuel charge components.