An oil well pump rail fixed valve

Abstract

The invention discloses a fixed valve for a rail of an oil well pump. The fixed valve for the rail of the oil well pump comprises a fixed valve cover, a fixed valve ball seat, a mandrel conversion joint, a sealing mandrel and a fixed valve pipe plug which are sequentially connected from the top end to the bottom end, wherein a sealing section is arranged on the sealing mandrel; a plurality of mutually-jacked spacer rings and spacer sleeves sleeve the sealing section; one spacer sleeve is arranged between every two spacer rings, and the outer diameter of each spacer ring is greater than the outer diameter of each spacer sleeve; a plurality of sealing sleeves are further arranged on the sealing section; the sealing sleeves sleeve outside the spacer sleeves; and the sealing sleeves form interference fit with a seat sealing lining of the oil well pump. The fixed valve for the rail of the oil well pump is stable in sealing structure, and capable of keeping the sealing performance of the whole pump.

Description

technical field [0001] The invention relates to the technical field of oil extraction devices, in particular to an oil well pump rail fixed valve. Background technique [0002] Orbital valve type oil well pump, when producing oil, the fixed valve is located at the lower part of the oil well pump, which acts as a one-way valve. When inspecting the pump, the fixed valve can be lifted out of the seat seal bush through the track at the lower part of the plunger to drain the oil, and then the plunger and the fixed valve can be lifted out of the wellhead for maintenance by lifting the sucker rod string. Double-channel injection and production oil well pump, the fixed valve is at the lower part of the oil well pump during oil production, which acts as a one-way valve; when steam is injected, the fixed valve can be lifted out of the seat seal bush through the track at the lower part of the plunger to expose the steam injection hole , for steam injection; when inspecting the pump, t...

AI Technical Summary

Problems solved by technology

However, the volume of cups made of some materials expands in high temperature environments, and when the temperature drops, the volume shrinks, which directly causes the axial compression to not maintain the original state.

In addition, when the fixed valve is pressed into the bushing, or the bushing is pulled out, the cup support ring moves axially, and the friction or extrusion force is transmitted step by step, resulting in excessive extrusion of the top or bottom cup and fatigue damage , while other cups have insufficient compression and move axially. Once deflected, they will be squeezed and deformed

After the cup is over-extruded, the locking force is insufficient due to insufficient retraction. When pumping oil, the fixed valve will be washed upward by the liquid flow, thus losing the function of the one-way valve

The above situations will lead to the failure of the sealing assembly of the whole pump, resulting in unstable output and even shutdown accidents

[0004] To sum up, the existing fixed valve has the disadvantage that the sealing structure is unstable, which easily leads to the failure of the sealing assembly of the whole pump.

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