Screw pump with touch valve

Abstract

The invention discloses a screw pump with a touch valve. The screw pump comprises a screw pump rotor, a screw pump stator, a screw pump torque anchor, a traveling valve device, a screw pump upper joint and a screw pump lower joint. The traveling valve device comprises a traveling valve ball, a valve seat support and a valve seat pressing cap. The screw pump is characterized in that a touch valve is arranged between the lower end of the screw pump stator and the traveling valve device and the touch valve comprises a valve cylinder, a touch valve body, a touch valve pressing cap, a touch valve upper joint, a touch valve coupling, a touch valve upper ratchet wheel, a touch valve lower ratchet wheel and a reset spring. The screw pump has a novel structure, rotation flexibility, a long service life, wear resistance, high temperature resistance, corrosion resistance and small torque.

Description

Technical field [0001] The invention relates to the technical field of oil extraction equipment, in particular to a screw pump with a touch valve. Background technique [0002] As we all know, in the process of heavy oil production, the main processes include steam viscosity reduction, electric heating, and chemical mixing. Most heavy oil wells with well depths below 1000m use steam injection, boring wells, self-injection, and mechanical pumping. With the continuous development of science and technology, the gas injection technology has also been continuously improved. The integrated injection-production process has been widely used in the gas injection and oil production process, which has realized the way from gas injection to machine pumping and no operation, saving costs. Reduce labor intensity and increase production efficiency. [0003] At present, the existing heavy oil exploitation mainly adopts four types of injection-production pumps. One is to inject gas through the oil...

AI Technical Summary

Problems solved by technology

The valve ball of the pump with this structure is suspended on the upper part of the ball seat with shear nails and shear rods to form a steam injection channel, and the structure is complex

The other is to inject gas through the outside of the pump barrel. In this structure, steam cannot be injected to the bottom of the well, which greatly reduces the effect of gas injection. The third is a series feedback pump. Before steam injection, the plunger must be lifted out of the pump barrel to operate cumbersome

At the same time, because the horizontal well is approximately vertical to the ground, the fourth is to use surface-driven or submersible screw pumps. However, the inner cavity of the stator of the currently produced screw pumps is lined with a rubber layer, which can easily cause dry wear damage to wells with insufficient fluid supply. In thermal recovery wells Can not meet the high temperature, the aging of rubber is accelerated at high temperature, so it is not suitable for high temperature oil well; none of these four pumps can be used in the horizontal section of horizontal well, they cannot adapt to high temperature wells and must be operated during steam injection, not suitable for the current thick oil extraction

[0004] In addition, there is an eccentric screw pump rotor on the market. The substantial disadvantage of this eccentric rotor is: because the design parameters usually adopt a small eccentricity E and a large rotor diameter D, the helical profile of the formed rotor is not obvious, so the rotor The seal with the stator is a surface seal rather than a line seal, and the outer surface of the rotor is relatively rough, which reduces the hydraulic efficiency of the pump, the stator is easy to wear and generate heat, and accelerates the aging of the stator rubber

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