METHOD OF WELL BOTTOM ZONE DEVELOPMENT Russian patent published in 2009 - IPC E21B43/25 

FIELD: oil and gas industry.

SUBSTANCE: invention is related to mining and may be used for development and restoration of operational wells debit, which dropped due to mudding of bottom zone by asphalt-gum-paraffin compounds and mechanical admixtures. Method of well bottom zone processing includes formation of depression pressure drop between well bottom zone and well cavity. Preliminarily well collar is connected to receiver filled with gas. Periodical pressure pulses are created in well bottom zone, in the form of wave that travels in well cavity and that is generated during periodical opening of well cavity at the collar for outflow of pressurised well fluid, and its closure with the help of valves. One of which - valve of fluid drain - connects well cavity with drain tank, the second - valve of fluid topping - connects well cavity with pressurised fluid source. Opening and closing of well cavity at the collar for outflow of pressurised well fluid is done by fluid drain valve. Pressure is periodically increased in well by connection of well collar with pressurized fluid source by means of fluid topping valve opening. Fluid drain valve is opened during travel of well fluid from bottomhole to collar with periodicity that provides swinging of its mass in resonance mode.

EFFECT: bringing of well fluid column mass in condition of resonant reciprocal motion.