PUMP ROD WITH CENTRING ELEMENT Russian patent published in 2014 - IPC E21B17/10 

FIELD: oil and gas industry.

SUBSTANCE: at the pump rod there are installed upper and lower split bushings consisting of split half-bushings tied up by fastenings. The centring element is placed at the pump rod between thrust split bushings. The centring element includes split half-liners, split semi-holders, collars and centring fins. The split half-liners have ring lugs along the outer diameter made perpendicular to the axis of the centring element as a complete unit with split half-liners. The split semi-holders have groves in the inner diameter and cuts are made at inner rims of the split semi-holders, at that quantity of such cuts corresponds to quantity of centring fins. The collars are tied up by fastenings through mounting holes and installed in cavities of split semi-holders. The centring fins are made as resilient arc-wise planks of the preset shape and cross-section, and their quantity hall not be less than three, at that the centring fins at the end sections have bends entering slots of the split semi-holders.

EFFECT: centring of the rod string coaxially with inner wall of the tubing, increase in reliability of the equipment, prevention of centraliser turning inside the tubing, reduction owns costs of the product extraction.

2 cl, 8 dwg