DEVICE FOR DEVELOPMENT OF WELL WITH SWABBING Russian patent published in 2011 - IPC E21B43/25 

FIELD: oil and gas production.

SUBSTANCE: device consists of swab, of production string with arrester of swab run, with filter for communication with reservoir, and of packer set above reservoir. According to the invention the production string has a row of through holes above the packer but below the swab run arrester. In an initial position the holes are closed with a hollow bush fixed with a shear element relative to the production string and equipped with a valve spring loaded downwards. The hollow bush performs limited travels downwards under force of excessive pressure created in production string till its rest against an internal circular recess of the production string; successively the hollow bush is fixed with a spring split retaining ring by an upper end of the hollow bush thus communicating internal space of the production string with an above-packer zone. Also, the swab is equipped with a safety valve spring loaded upwards and opening at force of 80-90% of critical allowed force.

EFFECT: simplified design of device, increased efficiency of well development due to elimination of inflow of well fluid from annular space above packer between production string and tubing string; elimination of break of swab cable.

4 dwg