DEVICE FOR ACTUATING PACKING ELEMENT OF PACKER Russian patent published in 2011 - IPC E21B33/12 

FIELD: gas and oil production.

SUBSTANCE: device for actuating packing element of packer consists of complex hollow case with lengthwise slots on external surface and at least one radial orifice. A jacket is arranged outside the case. The jacket forms a circular cavity with the case hydraulically connected with a cavity of the packer. There is a dividing bush in a lower section of the circular cavity and connected with the jacket by means of at least one shear screw. In an upper section of the circular cavity there is located a locking bush rigidly connected with the dividing bush by means of control rods positioned in radial slots. The device has a unit of protection from pre-triggering placed in the radial orifice of the case. The unit is made in a form of a hollow shear pin projecting inside the cavity of the case and disconnecting this cavity from the circular cavity and a piston positioned in the cavity of the shear pin for additional disconnection of the cavity of the case from the circular cavity. The device actuates the packing element of the packer upon shear of the hollow pin, removal of the piston from the cavity of the pin and automatic facilitation of specified pressure of packing by means of shear pressure of the screw connecting the dividing bush with the jacket.

EFFECT: increased reliability of device operation.

3 cl, 2 dwg