SAFETY DEVICE FOR ROPE SUSPENSION OF WELLHEAD DRIVE Russian patent published in 2021 - IPC E21B19/00 F04B47/02 

FIELD: oil industry.

SUBSTANCE: invention relates to the oil industry and can be used in the operation of sucker rod pumping units using a wellhead drive. The safety device for the suspension cable of the wellhead drive includes a housing, into which a rod is inserted with the possibility of limited longitudinal movement, connected by a spring to the housing, and a mechanism for interaction with the drive cable. The spring is made in the form of a compression spring with hooks at the ends, the body is made in the form of a branch pipe with a longitudinal blind slot, into the inner cavity of which a rod with a radial pin is coaxially inserted, located in the slot of the body to limit the longitudinal movement of the rod, the opposite ends of the housing and the rod are equipped with protrusions with holes for the corresponding spring hooks and clamps of the mechanism of interaction with the corresponding parallel branches of the rope above the traverse. Outside the housing with the possibility of longitudinal movement, a mark or a proximity sensor is installed, which is activated when it approaches the mark on the rod, and outside the rod, a non-contact sensor is installed, which is activated when it approaches the mark on the body, or a mark, respectively. The non-contact sensor is technologically connected with the block for disabling the wellhead drive propulsion device.

EFFECT: invention provides the ease of manufacture, use and maintenance, ensures the reliability and versatility in operation, provides the possibility of adjusting the operation.

1 cl, 4 dwg