Mechanical anti-dry pumping tool for submersible screw pump

Abstract

The invention discloses a mechanical anti-dry pumping tool for a submersible screw pump, which belongs to the technical field of oil and gas drilling equipment and includes an outer pipe and a central pipe. The outer tube includes a first lumen and a second lumen; the central tube is sleeved in the outer tube and includes a first tube section and a second tube section, and a first spring is wound around the first tube section; the lower end of the second lumen is connected with a lower A joint, the lower joint forms a stepped third lumen and a fourth lumen; the lower end of the central tube is connected with a central cylindrical vertebral body through threads, and the lower end is conical, which can form a metal seal with the stepped surface of the third lumen. When the well fluid in the oil well is insufficient, due to the elastic force of the first spring, the crude oil cannot fully push the central cylindrical vertebral body, resulting in the diversion hole of the outer tube cannot be completely closed, the second spring is partially compressed, the conical sphere moves upward, and the pump and the outer tube The external annulus of the pipe is connected, and the submersible screw pump will not be dry pumped. This tool can realize the long-term stable operation of the submersible screw pump system, avoid dry pumping and burning pump failure, and improve the service life of the system.

Description

technical field [0001] The invention relates to the technical field of oil and gas drilling equipment. More specifically, the present invention relates to a mechanical anti-dry pumping tool for a submersible screw pump. Background technique [0002] Submersible screw pump oil recovery system is a new type of mechanical oil recovery system. This system not only makes full use of the advantages of surface-driven screw pumps for heavy oil wells, sand-bearing wells, low-yield oil wells, and water flooding, polymer flooding, and three-element flooding wells in the middle and later stages, but also absorbs the advantages of electric submersible pumps that do not use sucker rods to prevent rod tubes The advantage of eccentric wear is that the submersible motor is used to directly drive the screw pump body underground. At present, submersible screw pumps mainly use downhole electronic sensors to detect downhole parameters. Since electronic components are prone to failure and inacc...

AI Technical Summary

Problems solved by technology

[0004] In order to achieve these objects and other advantages according to the present invention, a mechanical anti-dry pumping tool is provided to solve the problem of pump dry pumping in the existing submersible screw pump oil production system leading to pump failure

Images