PACKER Russian patent published in 2003 - IPC

FIELD: oil and gas producing industry, particularly, devices for leakproof isolation of annular space. SUBSTANCE: packer consist of hollow mandrel, body, sealing packings, slips. Body has radial holes above and below sealing members. Annular space is formed between body and hollow mandrel and communicated through body radial holes with external space. Body upper part accommodates spring-loaded bushing with possible axial motion and closing of upper radial holes. Spring-loaded bushing is made in form of hollow cylinder whose external surface is engageable with body internal surface and form annular space between mandrel external surface and internal surface of spring-loaded bushing. Upper end of spring-loaded bushing has landing band and spring-loaded bushing external surface has bore. Lower radial holes are located at level of annular space. EFFECT: higher reliability of sealing of well annular space and extended functional potentialities of packer. 3 dwg