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 and filter for communication with reservoir, and of packer set above reservoir. According to the invention the production string is equipped with a hollow tip from beneath, while the filter is equipped with an internal cylinder cavity from top. Also, the tip is inserted into a head, from which it is spring- loaded upwards. The tip performs limited lengthwise transfers. Further, the tip has upper and lower rows of holes separated inside with a partition and communicated when the tip travels downwards relative to the head of the filter through internal cylinder cavity of the head. A knocking down valve for communication of the production string with an above-packer zone upon release of a knocking down element is installed above the tip and the packer, but below the arrester of swab run in the production string. 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, elimination of inflow of well fluid from annular space above packer between production string and tubing string into developed reservoir after unpacking of packer; guaranteed elimination of break of swab pulling cable.

5 dwg