PACKER Russian patent published in 1994 - IPC

FIELD: oil and gas production. SUBSTANCE: packer has hollow barrel, cone with tool extractor put on barrel, sealing member with locator of its position with respect to barrel, adapter with drive concentrically mounted with reference to barrel for axial movement and interaction with locator of sealing member and cone, branch pipe coupled to barrel with the aid of additional locator. Additional locator is manufactured in the form of bevel cut cams spring-loaded with respect to each other. Adapter has inner cone- shaped surface for interaction with bevel cuts of cam and right-hand thread in upper part. Arm of sealing member locating it with respect to barrel is made fast to adapter and has outer protrusions for interaction with outer protrusions of locator of sealing member fixing it with respect to barrel when packer is withdrawn. Drive for axial movement of adapter is fabricated in the form of hydraulic cylinder mounted concentrically with reference to branch pipe and installed for interaction with face of adapter. Branch pipe has end-cap in lower part and radial ducts to communicate underpiston space of hydraulic cylinder with pressure source. EFFECT: improved efficiency and reliability. 1 dwg