Progressive cavity pump drives and progressive cavity pump systems

Abstract

The invention discloses a screw pump driving rod and a screw pump system and belongs to the field of petroleum equipment. The screw pump driving rod comprises an upper joint, at least two connecting assemblies and a lower joint which are connected sequentially end to end and are rod-like; a tail connecting part is arranged at one end of the upper joint, and a head connecting part is arranged at one end of the lower joint; a head connecting part with the same structure as the head connecting part is arranged at one end of each connecting assembly, and a tail connecting part with the same structure as the tail connecting part is arranged at the other end of each connecting assembly. Through cooperation of the head connecting parts and the tail connecting parts, the upper joint, the at leasttwo connecting assemblies and the lower joint are connected sequentially end to end. The problem that the screw pump driving rod still bears higher alternating load during rotation in related art is solved, and the effect of reducing alternating load borne by the screw pump driving rod is achieved.

Description

technical field [0001] The invention relates to the field of petroleum equipment, in particular to a screw pump driving rod and a screw pump system. Background technique [0002] Screw pump is a commonly used pump for oil recovery, especially suitable for oil reservoirs with high viscosity, high sand content, and large oil-gas ratio. Screw pump also has many advantages such as small size, light weight, and convenient maintenance. The screw pump is usually connected to the surface driving device through the driving rod of the screw pump, and the driving device on the ground drives the screw pump to extract oil by rotating the driving rod of the screw pump. [0003] In the related art, there is a screw pump driving rod. The screw pump driving rod is a straight rod. One end of the straight rod is connected to the ground driving device, and the other end is connected to the screw pump. Both the screw pump and the screw pump driving rod are located under the oil well. When there...

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Problems solved by technology

[0005] In order to solve the inclined well section in the prior art, the centralizer outside the screw pump driving rod can avoid the direct contact between the screw pump driving rod and the tubing, but the screw pump driving rod will still bear a large alternating load when rotating, which is For the problem that it may cause great damage to the driving rod of the screw pump, the embodiment of the present invention provides a driving rod of the screw pump and a screw pump system

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