DRILLABLE PACKER Russian patent published in 2014 - IPC E21B33/12 

FIELD: oil-and-gas industry.

SUBSTANCE: drillable packer consists of mandrel with shoe at its bottom and spring-loaded check valve fitted inside mandrel axial channel. Top and bottom cutoff slips with expanding cones, seal element and movable support with the stack of split lock wings are fitted on said mandrel. Said mandrel has inner bore at bottom end. Mandrel axial channel accommodates hollow rod with extender and collet. Said extender has lengthwise grooves. Collet lugs have heads to interact with the mandrel inner bore. Besides, they interact with check valve cone in axial channel via extender grooves. Extender has throttling orifice and radial orifices there above and is arranged to get in end contact with shoe check valve. Said rod has adapter with adjusting nut and is coupled with mandrel by cut element.

EFFECT: packer protection against overpressure, tightness of production tubing, direct or back flushing of axial channel.

4 dwg