METHOD AND DEVICES TO CREATE TRANSITION PRESSURE CONDITION INSIDE WELL BORE Russian patent published in 2007 - IPC E21B43/18 E21B43/263 E21B43/117 

FIELD: oil production, particularly enhanced recovery methods for obtaining hydrocarbons by repressuring or vacuum methods.

SUBSTANCE: method involves activating the first component in tool string to create transition depression pressure within well bore interval; activating the second component of tool string to create transition repression pressure within well bore interval before transition depression pressure creation by the first component. Device in accordance to the first embodiment comprises solid fuel with a number of cavities and blasting means installed in the cavities. Device in accordance to the second embodiment comprises band, blasting means connected to the band, solid fuel inserts arranged between blasting means and detonating fuse fastened to blasting means and solid fuel inserts in ballistic manner. Tool string comprises bearing member with blasting means arranged therein. The blasting means are activated to form orifices in bearing member and to create transition depression pressure. Tool string also has the second component, which activates solid fuel to create transition repression pressure before depression pressure creation.

EFFECT: improved reservoir communication with well bore and increased efficiency.

20 cl, 10 dwg