Jaw-type helical tooth centering device for coalbed gas well drainage pump

Abstract

The invention provides a clamping jaw type spiral tooth centering device of a coal bed gas well drainage mining pump, and applies to underground centering of the plunger and the pump cylinder. The centering device adopts a spiral tooth stirring and clamping jaw type butt joint technology, the low-sink-degree working condition coal powder can be effectively prevented from being deposited on the upper portion of the plunger and the middle cover body, and the coal powder clamping pump is avoided. The middle cover body is discharged according to the jet nozzles which are arranged in a layered modepumping the well liquid sucked by the pump into the annular space of the discharging and collecting rod and the discharging and collecting pipe, the spiral tooth stirrer is used for realizing the upper limit of the middle cover body and realizing the lower limit by centering the middle coupling, the centering base body is connected with the centering cover body and the butt joint clamping jaw ina three-in-one mode, the centering base body and the butt joint clamping jaw are arranged in a three-in-one mode, the butt joint clamping jaw realizes rapid butt joint between the middle cover body and the centering base body and the centering coupling, and meanwhile, the underground real-time alignment between the plunger and the drainage rod and the pump barrel is realized according to the double-column-surface moving pair between the centering coupling and the centering cover and the drainage rod, and the lifting speed of the well liquid above the plunger is completed through the middle coupling.

Description

technical field [0001] The invention relates to a device for centering a plunger and a pump barrel of a coalbed gas well drainage pump, in particular to a centering device for an underground drainage pump using helical tooth stirring and claw-type docking technology. Background technique [0002] Coalbed methane mining has entered a stable production stage, and the subsidence in the wellbore is usually low. After the well fluid is sucked out by the drainage pump, the coal powder carried by it is easy to deposit in the annular space formed by the rod string and the pipe string above the plunger. In this process, the problem of pulverized coal stuck in the pump occurs. In addition, drainage pumps will encounter problems similar to the eccentric wear of the plunger and pump barrel during drainage and gas recovery operations, especially to solve the problem of eccentric wear of the plunger and pump barrel in horizontal wells and inclined wells of coalbed methane will have an imp...

AI Technical Summary

Problems solved by technology

[0004] In order to effectively solve the centering problem of the plunger and pump barrel in the coalbed gas well drainage pump and overcome the defects and deficiencies of existing centralizers, the purpose of the present invention is to provide a coalbed gas well plunger and pump barrel with eccentric wear and low subsidence Jaw-type helical tooth centering device for high-speed working conditions

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