PACKER Russian patent published in 2009 - IPC E21B33/12 

FIELD: mining.

SUBSTANCE: packer consists of trunk with shaped slot, of centraliser, of self-sealing collar, of sealing element and of cone. A fixture with a guiding pin is assembled on the trunk below the cone; the fixture is intended to axial displacement. The fixture is equipped with oval sockets around circumference; the sockets are spring loaded internally in radial direction by means of springs and they interact with the cone during operation. A rod, capped from the top and connected below with the trunk, is screwed into the upper end of the trunk. At the top the rod is connected with a load equipped with a chamber in the lower part. The rod has radial openings and fingers located above the openings, while the load has lengthwise pass-through grooves for fingers of the rod. The lower part of the chamber is designed to shut off pressure tight radial openings of the rod, when the load goes down. Two axial short sections of the shaped slot are closed between them so, that the pin is situated within boundaries of the short axial sections - transport position - at axial reciprocal movement of the fixture relative to the trunk at length equal or exceeding length L of the short axial sections. When the fixture goes down relative to the trunk at a distance less, than length L of the short sections of axial parts and at following travel of fixture up, the pin goes to a longer axial section of the shaped slot, directed upward and set off along perimetre relative to the short axial sections - working position. Also the pin travels from working into transport position, when the fixture goes down relative to the trunk at a distance exceeding or equal to length - B of the shaped slot.

EFFECT: increased efficiency at multiple pressurising of production string due to possibility to shut off radial openings of rod pressure tight from outside.

2 dwg