DEVICE FOR CONNECTING ROD STRING WITH GROUND DRIVE Russian patent published in 2022 - IPC F04B47/02 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, namely to a device for connecting a rod string with a surface drive. Device includes lower crossbar 2, connected coaxially to the top of polished rod 1 of the rod string with the possibility of longitudinal movement upwards, upper crossbar 3 connected coaxially with drive pull rod 4 with possibility of longitudinal downward movement, and side longitudinal rods 5, connected by corresponding ends with crossbars 3 and 2. Rod 1 is connected to crossbar 2 by means of a hollow bushing with an inner conical surface, tapering from top to bottom, for wedges fixing the top of rod 1, and an inner thread from above for a mounting nut resting on the end of rod 1 from above. Between the hollow bushing and crossbar 2 there is an elastic damper with a load sensor, which is functionally connected to the drive control unit. End of each rod 5 is equipped with upper and lower stops, respectively, located on top of upper and lower crossbars 3 and 2, respectively, in which rods 5 are inserted with possibility of longitudinal movement limited by stops. Elastic damper is installed between the upper stop of each rod 5 and crossbar 3.

EFFECT: invention makes it possible to exclude bending of polished rod at suspension of rod string and to reduce load at change of direction of drive movement.

3 cl, 4 dwg