LUBRICATOR FOR INVESTIGATION OF OIL AND GAS WELLS WITH HIGH EXCESS PRESSURE AT HEAD Russian patent published in 2012 - IPC E21B33/03 

FIELD: oil and gas industry.

SUBSTANCE: sealing device of lubricator includes contact sealing assembly of logging cable, which includes lower and upper contact seals, press-on bush, upper and lower pistons arranged in common hydraulic cylinder; at that, press-on bush is equipped with a liner on which there installed is upper and lower pistons with possibility of being moved to opposite sides interacting with their contact seals at supply to hydraulic cylinder of control pressure. Overall dimensions and weight of sealing device is sufficiently reduced due to using one hydraulic cylinder and one hydraulic line, and control of the device is simplified.

EFFECT: improving operating efficiency of lubricator due to improving sealing ability of sealing device, reducing its weight and overall dimensions and simplifying the control of the device.

1 dwg