HOLLOW ROD AND A SPLIT CASING PUMP FOR A DEEP-SEATED SUCKER ROD PUMP

摘要

The invention relates to the oil-and-gas industry. The inventive hollow rod of a rod string for a deep-seated sucker rod pump plant comprises a tubular body and heads. Each head is embodied in a solid manner and is sealingly fixed to the rod tubular body. A split deep-well long-stroke rod pump comprises a cylinder embodied in the form of in-series connected sections (8) and comprises a twinned piston (9,10) placed in said cylinder and provided with pumping valves (11, 12) and suction valves. The adjacent sections are connected with the aid of a bolt flange joint (13, 14) comprising at least two centring pins which are located in coaxial through holes embodied along the circumference of the adjacent flanges (13, 14). Each centering pin is embodied in the form of a rod provided with central conical and end threaded parts. The axes of the through holes in the adjacent flanges provided with centering pins are embodied in such a way that they are asymmetrical with respect to the axis of connection of the adjacent sections. Said invention makes it possible to increase the reliability by reducing a load applied to a drive and rods when a reversed drive is carried out and to reduce the wear of the piston and areas connecting the adjacent sections.