PROCESSING METHOD OF BOTTOMHOLE ZONE Russian patent published in 2008 - IPC E21B28/00 E21B43/25 E21B37/00 

FIELD: mining engineering.

SUBSTANCE: one pumps fluid into borehole cavity. Then depression differential pressure is formed between bottomhole zone and borehole cavity creating repetitive pressure pulses in bottomhole zone as moving in borehole cavity impulse wave. It is created while periodic opening of borehole cavity in mouth for bore-hole fluid effluxion which is under pressure, and its closing with the usage of ball checks. One of them is fluid effluxion ball check connects borehole cavity with dump tank, another - filling fluid ball check - with fluid source which is under pressure. Opening and closing of borehole cavity in mouth for borehole fluid effluxion, which is under pressure, is made with the help of fluid effluxion ball check. According to invention opening of fluid effluxion ball check is made with the speed, providing sudden drop in pressure in borehole mouth to atmospheric, and closing - with the speed in 2-5 times lower the speed of its opening.

EFFECT: creating of periodic pressure impulses in bottomhole strata zone, when depression impulse has greater pulse height than repression impulse.