MECHANICAL PACKER Russian patent published in 2003 - IPC

FIELD: oil and gas industry. SUBSTANCE: invention can be used for completion and operation of oil and gas wells, for conducting various technological operations with insulation of absorption zones in process of well driving, squeeze cementing, hydraulic formation breakdown. Mechanical packer includes shaft with shaped grooves in outer surface which have longitudinal straight short and long sections. Support is made fast to shaft, sealing element and cone are located under support. Cone is mounted for axial movement relative to shaft. Shackle is put on shaft for axial movement. Slips spring-loaded in radial direction with regard to shackle and held in middle part by limiter are uniformly arranged over shackle circumference. Lower parts of slips come in the form of starting guide cams. Split ring is installed in lower part of shackle for radial rotation with reference to shackle but made fast to it in axial direction. Groove of rectangular profile is cut in internal surface of ring and external surface of shackle has collars of rectangular profile in the form of separate sectors. Collars and groove form sliding pair and add to cleaning of groove from slurry. Two diametrically opposite guide pins are interference fitted in internal part of ring along one axis, perpendicular to axis of packer. Shaft includes inclined and straight sections. Each straight section becomes inclined counterclockwise which in its turn adjoins on next straight section at acute angle. Face of ring has recess to fix guide cams. Rake angle α of collars is equal to 10 degrees. EFFECT: increased operational reliability of packer thanks to prevention of its break in lower part of shaped groove. 4 dwg