DEVICE FOR PAYOUT BED SECONDARY EXPOSURE Russian patent published in 2011 - IPC E21B43/11 E21B43/08 

FIELD: oil and gas production.

SUBSTANCE: device for payout bed secondary exposure consists of well filter, into holes of which there are inserted cartridges, ad of case with internal cavity and centraliser with destructible element positioned on pipe string. The cartridges are filled with viscous plastic substance and have projecting parts. The destructible element is equipped with a shearing funnel above the case. A lower edge of the shearing funnel interacts with parts of the cartridge projecting inside and destroys them at travelling downward. The centraliser is set on the case at the top and is made in form of a collet. The shearing funnel is rigidly connected with the case by means of a hollow rod so, that distance between the lower edge of the funnel and the upper edge of the collet exceeds diametre of the cartridge. From beneath the hollow rod is equipped with a flushing nib.

EFFECT: reduced number of roundtrip operations and reduced load recived with hoisting unit.

2 dwg