PACKER Russian patent published in 1995 - IPC

FIELD: oil field equipment. SUBSTANCE: packer has disconnection unit including nipple with holes connected with pipe string, nipple balls installed in nipple holes, shear member-connector installed in stepped cylinder for limited axial motion and connected with cylinder in its extreme upper position and having upper and lower circular recesses on its outer surface, seat for drop member and upper and lower balls. Body is made with inner circular recess. Adjusting branch pipe has outer circular recess and is connected with nipple by means of shear member and mounted for limited axial motion and coincidence in extreme position of its radial channels with body radial channels. Stepped cylinder has ports to receive upper and lower balls for accommodation in working position of sealing member in upper and lower recesses of connector, and in extreme lower position of connector, in recess of body and inner recess of locking bushing. In this event, nipple balls in initial position of packer are located in inner circular recess of body, and in extreme lower position of adjusting branch pipe, in its outer circular recess. EFFECT: increased reliability and extended operation capabilities. 6 dwg