PACKER Russian patent published in 2007 - IPC E21B33/129 

FIELD: oil and gas production industry, particularly to hermetically isolate one well bore section from another one.

SUBSTANCE: packer comprises anchoring unit, check valve, sealing member, upper and lover mandrels connected with each other. The packer is provided with mounting nut with window arranged in lower part of lower mandrel and connected to the body adapted to receive check valve. Packer additionally has locking device installed in upper part of lower mandrel, as well as with upper and lower split nut installed in control-rod between upper and lower mandrels and between pusher and upper mandrel correspondingly. Lower split nut has inner thread formed on inner surface thereof and mating that of lower mandrel and outer thread made on outer split nut surface and corresponding to that of upper mandrel. Upper split nut has inner thread formed on inner surface thereof and mating that of upper mandrel and outer thread made on outer split nut surface and corresponding to that of lower mandrel. Check valve body has window. Anchoring unit is arranged between sealing member and mounting nut.

EFFECT: increased operational reliability, extended service life, simplified device lifting and lowering and increased easiness of technological well operations.

3 cl, 1 dwg