HYDROMECHANICAL PACKER Russian patent published in 2010 - IPC E21B33/12 

FIELD: oil and gas production.

SUBSTANCE: invention relates to oil and gas producing industry to isolate axial channel of casing pipes. Provides for easy withdrawal from well, as well as for multiple use without withdrawal. Hydromechanical packer comprises shaft with radial channels having stop on external surface, hydraulic cylinder with piston, split collet fixed to hydraulic cylinder with anchor arranged on lower end of split collet, sealing ring, seat in lower part of shaft. Outside under the anchor, split collet is equipped with cone-shaped surface arranged with the possibility to interact with piston. Sealing ring is placed on shaft above hydraulic cylinder under sub acting as upper stop and above lower stop inserted telescopically and tightly into hydraulic cylinder equipped with inner recess at the bottom and outer one - at the top. Split collet at the bottom is equipped with inner hooks that cover shaft stop at the bottom with the possibility of disconnection as cone-shaped surface of collet interacts with piston, and cylinder on top has an internal narrowing, which is arranged with the possibility of upward longitudinal motion relative to outer recess of lower stop. Sealing ring may be arranged as assembled, including at least one elastic bush arranged between rigid bushes.

EFFECT: packer makes it possible to maintain any permissible pressure differences in well space separated by packer.

2 cl, 2 dwg