PACKER Russian patent published in 2003 - IPC

FIELD: oil and gas industry, closure of well bore without installation of cement plug. SUBSTANCE: given packer includes cylindrical body with central axial conduit, compressible sealing element placed on body, elements fixing packer in tube and hydraulic drive. Body of packer is fitted with split enclosure coming in the form of collet. Packer is equipped with toothed blocks anchored by sheared pins on internal surface of tabs of split enclosure. Hydraulic drive is fitted with sleeve which is made fast to ring piston, toothed cuts are made in external surface of sleeve. Toothed blocks are mounted for interaction with sleeve over their conjugate toothed cuts with formation of ratchet-and-pawl gear to fix sealing element in compressed state and elements fixing packer in tube in working position. Head end and rod end communicate with central axial conduit with use of radial conduits made in body of packer. Packer is provided with valve for its activation and valve for its unfitting, each valve being anchored on tubular rod and coming in the form of piston. Groove communicating with internal conduit of tubular rod through radial conduit made in body of valves is cut in external surface of valves. While valves are installed in central axial conduit in body of packer groove of valve for activation communicates with rod end of hydraulic drive and groove of valve for packer unfitting communicates with head end of hydraulic drive through radial conduits made in body of packer. Packer is also equipped with valve activated to communicate space of central axial conduit in body of packer above valve with head end. This valve is provided with retaining ring anchored on body of packer by means of sheared pins. EFFECT: increased reliability of fixing packer in tube in working position. 5 dwg