ARMATURE OF HYDRAULIC JACK FOR INSTALLATION OF EXPANDABLE SHUTTER IN WELL Russian patent published in 2016 - IPC E21B23/06 

FIELD: mining.

SUBSTANCE: invention relates to devices for fixation of equipment in well and can be applied in downhole hydraulic jack. Anchor includes: hollow housing with tapered recesses and upper thread for connection with pipe string, inserted from below telescopically; hollow pusher, capable to longitudinal upward movement upon housing, with lower thread for connection to hydraulic jack, and guides for billets with inclined surfaces inside, configured to displacement upwards along tapered recesses together with pusher, which backs them from below, radially movable along guides; and resilient element pressed from above by housing, and from below by stop. Stop is being formed as washer resting from below to upper ends of billets. Resilient element is made in form of compression spring arranged to rest on housing above tapered recesses. Hollow housing is arranged to communicate only with external space. Spring compression force is being selected sufficient for return of hydraulic jack in working position.

EFFECT: higher efficiency and reliability of anchor.

1 cl, 1 dwg