DOWN-HOLE INSTALLATION FOR EFFECT ON BOTTOMHOLE FORMATION ZONE Russian patent published in 2012 - IPC E21B28/00 E21B43/25 F04F5/02 

FIELD: oil and gas industry.

SUBSTANCE: down-hole installation includes shank with flow control mounted on string, above the shank there is puckering device, sleeve, housing of jet pump with nozzle, mixing chamber and diffuser, also flow direction switch. The sleeve has central, through and side channels. The side channel connects central channel with sleeve outer surface and annular space. There is a flow direction switch in central channel in a form of hollow insert with blind end and hole in side wall located near by. The sleeve contains switching mechanism for hollow insert stroke length. Hollow insert from the side of blind end is mounted in central channel with the possibility of movement, when hydraulic connection or disconnection of the hole in side wall with sleeve side channel takes place. The housing of jet pump has a shoulder and side hole between nozzle and mixing chamber, connected to open end of hollow insert and installed with gap inside the saddle fixed in string. When hollow insert and hydraulic connection of the hole in side wall with side channel is moved, the shoulder of jet pump housing is tightly seated into the saddle.

EFFECT: increase of efficiency of alternating pressure effect on bottom-hole formation zone.

23 cl, 2 dwg