DEVICE FOR INSTALLATION AND SEALING OF CASING LINER IN WELL Russian patent published in 2001 - IPC

FIELD: casing of oil and gas wells, precisely, devices for lowering and sealing of casing string annular space, particularly, of casing liner. SUBSTANCE: device includes body and transportation column connected with body. Located in upper part of casing liner are disconnector, packer and anchor. Device has branch pipe with radial holes and throttle-shutoff valve under these holes for closing branch pipe internal section at preset flow rate of liquid with preset rheological properties. In this case, branch pipe is connected with body and forms together with liner, in its upper part, circular cavity hydraulically connected with branch pipe cavity through its radial holes, and with units of drive of anchor, packer and disconnector and has possibility for its withdrawal from well with body and transportation column. EFFECT: simplified device, higher operate reliability of device and increased reliability of sealing of linear annular space. 3 cl, 3 dwg