DEVICE FOR RESERVOIR TREATMENT AND RESERVOIR COLLECTING PROPERTIES RETENTION Russian patent published in 2007 - IPC E21B37/00 E21B33/122 

FIELD: oil and gas production, particularly to disconnect reservoirs inside wells during reservoir treatment and development.

SUBSTANCE: device comprises pipe string and disconnector. Disconnector has stem with valve arranged in bottom stem part and slide hermetically inserted in through channel thereof and having seat for ball receiving. Packer is installed in upper stem part. Device also has shear member. Stem is provided with additional packer installed in lower part thereof. Annular recess is made in stem between packer and additional packer and defined by upper and lower cones from recess top and bottom. Cup provided with finger is installed between upper and lower cones so that the cup may slide in longitudinal direction and rotate. Upper and lower slips provided with upper and lower centrators are installed from cup top and bottom correspondingly. The centrators are spring-loaded by cup and may cooperate with upper and lower cones respectively. Two short longitudinal grooves and one long longitudinal groove are made in outer stem surface and adapted to cooperate with finger. The grooves are connected with each other through figured grooves. One figured groove communicates bottom part of the first short longitudinal groove, which is transport groove, with central part of long longitudinal groove, which is working one. Another figured groove connects lower part of long longitudinal groove with central part of another short longitudinal groove located near long longitudinal groove center and formed as detachable unit. Packer and additional packer are made as self-sealing collars fixedly installed on stem and extending in different directions. Lower stem part has inner cylindrical recess. Slide is provided with fishing head located over seat and provided with radial channels. Slide also has spring ring located below seat and cooperating with inner cylindrical recess of the stem. Valve is made as spring-biased rotary plate adapted to cooperate with lower slide end and to close through stem channel during slide removal from stem connected with pipe string by shear member.

EFFECT: extended functional capabilities and simplified usage technology.

2 dwg