WELL FORMATION DEVELOPMENT DEVICE Russian patent published in 2015 - IPC E21B43/18 E21B43/25 

FIELD: oil and gas industry.

SUBSTANCE: well formation development device includes tubing string with a packer installed above the formation and filter blinded from bellow for the purpose of communication with the formation, a bit with a row of holes. The filter is equipped with nozzle on top, with inner cylindrical cavity. The bit is inserted from top to the nozzle from which it is supported by the spring upwards. From bellow the tip is equipped with a saddle and a ball mounted on the saddle. The packer is made as an inflated rubber element with hydraulic chamber connected by axial channel made in the nozzle with its inner cylindrical cavity. At that in initial position the row of bit holes is placed opposite inner cylindrical cavity of the nozzle and communicated to inner surface of the tubing string. At that a hollow body rigidly fixed to the tubing string from the top is installed telescopically at the bit top. The hollow body is fixed in regards to the bit in initial position by a shear tie and in operating position the bit may be moved axially in limited way in regard to the hollow body and nozzle, compression of the spring, fixation of the hollow bit in regard to the nozzle, sealed cut-off of the row of bit holes at the inner head of the nozzle. At that the tubing string above the hollow body is equipped with sucker rod pump.

EFFECT: improved quality of the operation device, improved reliability of sealing.

2 dwg