ROD STRING Russian patent published in 2018 - IPC E21B17/00 E21B17/05 

FIELD: engines and pumps; oil and gas industry.

SUBSTANCE: invention relates to oil production techniques and downhole equipment and can be used in oil extraction by sucker-rod deep well pumps from any wellbore profile. Rod string contains pumping rods and blind couplings, as well as hinge couplings. Hinge couplings are made in the form of a bowl with internal boring and a connecting thread for the rod at one end, a supporting sleeve rigidly connected to the second end of the beaker and provided at the end with a conical bore installed inside the glass at the level of its internal boring, and a rod located in the axial hole of the bearing sleeve with a gap and made with a threaded rod at one end. Hinge couplings are provided with an abutment rigidly connected to the second end of the stem and located in the inner bore of the radial clearance beaker, and a bushing mounted on the rod and located in the inner bore of the cup, one end of which is made with a flat surface, and the second end has a spherical surface, the spherical end with the conical boring of the support sleeve forms a spatial hinge, and the flat end with the flat end of the stop forms the thrust sliding bearing.

EFFECT: increased reliability and durability of a rod string in obliquely directed and bent wells.

1 cl, 1 dwg