FIELD: oil and gas production.
SUBSTANCE: device consists of hollow pump rods and of connecting elements interconnected along axis between driven head on surface of oil well and rotor pump located in bottomhole of oil well. Each hollow pump rod has at least first end with internal threaded surface coupled with external threaded surface of the connecting element, such as a nipple element. There are used conic threads of asymmetric profile and various taper to optimise distribution of stresses between elements. There are preferred versions where two collars with maximum average diameter and area of cross section are used to increase resistance to maintaining reactive torque in a string. A free end of the nipple element forms the second collar for torque transfer facilitating transfer of torque at assembly and simultaneously forming small boss on the said free end decreasing problems of erosion-corrosion.
EFFECT: raised quality of connection, strength and reliability.
50 dwg, 17 cl
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