HEAT-RESISTANT PACKER Russian patent published in 2005 - IPC

FIELD: oil industry, particularly for sealing tube space of geothermal and steam-injection wells over perforation interval by transmitting rotational moment of production tubing string to packer mandrel.

SUBSTANCE: device comprises stem connected to reducing coupler provided with finger, which passes in bayonet groove formed in mandrel and closed with band. Mandrel, band and reducing coupler are connected one to another by calibrated shear member. The mandrel is connected to extension means through coupling sleeve. Packer is provided with sealing member and seal arranged between upper and lower lids. Lower lid is connected by rod with upper releasing cone surrounded by case with spring-loaded dies in longitudinal windows also supported by lower releasing cone connected with threaded nut by pusher. The threaded nut has composed rest having figured extension facing pusher and provided with mating figured extension. The composed rest comprises longitudinal slots in which anvils are installed. The anvils pass in mating longitudinal windows of extension means and retained by supporting sleeve in above position. The supporting sleeve is connected with extension means by calibrated shear member and comprises annular groove on outer surface thereof. Installed on lower pusher end are nut and spring centrator griper. Figured extensions are installed so that the extensions may cooperate one with another during anticlockwise rotation acceptance and height thereof is less than pitch of threaded nut thread. When stem performs clockwise rotation threaded nut cooperates with pusher and moves lower releasing cone under spring-loaded dies and spring-loaded dies go out of longitudinal windows up to bringing thereof into cooperation with casing pipe and up to following seal deformation. Anticlockwise stem and reducing coupler rotation leads to finger displacement out of bayonet groove formed in mandrel body and upward stem movement up to reaching upper position to bring the parker into working position.

EFFECT: increased operational reliability.

9 dwg