DEVICE FOR TREATMENT AND RECOVERY OF FORMATION PRODUCTIVITY Russian patent published in 2013 - IPC E21B28/00 E21B43/25 

FIELD: oil and gas industry.

SUBSTANCE: device includes a working tube forming with a production string a behind-tube space, a packer, a controlled differential valve, a jet pump with a suction chamber interconnected with under-packer zone, with an outlet connected to behind-tube space and a chamber divided with the valve into two parts. One of the above parts is hydraulically connected to the working tube, and the other one is connected to the under-packer zone. In upper part of the jet pump housing there is a channel interconnected with upper and lower rows of through holes covered in initial position with a packing sleeve. At that, the working tube is interconnected with the well under-packer zone. Packing sleeve is equipped from above with a mounting seat for a ball released from the well head and fixed in the jet pump housing with a shear element. When in working position, packing sleeve has the possibility of restricted axial movement till interaction with inner annular projection of the housing and opening of upper and lower rows of through channels of the jet pump. The working tube is interconnected through upper row of through holes with the jet pump nozzle, and receiving chamber of the jet pump is interconnected through lower row of through holes and a differential valve with the under-packer zone.

EFFECT: increasing efficiency of formation treatment and recovery of its productivity.

2 dwg