Separation and crushing device of downhole pulverized coals of coalbed methane and method thereof

Abstract

The invention discloses a separation and crushing device of downhole pulverized coals of coalbed methane and a method thereof. The settling separation, the crushing and the filtration are performed for the pulverized coals, so that the particle size of the pulverized coals entering a screw pump reaches a normal working range of the screw pump, the accidents of pump blockage, blockage and abrasion caused by the pulverized coals with larger particles entering the screw pump can be effectively prevented, the pump detecting period is prolonged, the development cost of the coalbed methane is reduced, and the blockage of holes of a coalbed methane well by the pulverized coals is prevented; and the device has the advantages of simple structure, convenience for use and high efficiency.

Description

【Technical field】 [0001] The invention relates to a separation and crushing device, in particular to a coal bed gas underground coal powder separation and crushing device and a method thereof. 【Background technique】 [0002] Coalbed methane refers to hydrocarbon gas stored in coal seams with methane as the main component, mainly adsorbed on the surface of coal matrix particles, and partially free in coal pores or dissolved in coal seam water. It is an associated mineral resource of coal and belongs to unconventional Natural gas is a clean, high-quality energy and chemical raw material that has risen internationally in the past ten or twenty years. [0003] There are many drainage methods for mining coalbed methane: for example: rod pump drainage gas recovery method, screw pump drainage gas recovery method, electric submersible pump drainage gas recovery method, gas lift drainage gas recovery method, hydraulic jet drainage gas recovery pump method, foam method And preferred ...

AI Technical Summary

Problems solved by technology

[0004] The drainage of coalbed methane wells is a process of water drainage and gas recovery and continuous pressure reduction. When using a screw pump for drainage, when the drainage intensity is too high or when the production is stopped, the following problems will be caused: 1. When the particle size of coal powder is greater than 0.5mm (the particle size of the pulverized coal particles carried by the screw pump is less than 0.5mm when it is working normally), it will cause the screw pump to be stuck, blocked, worn and other phenomena, which will affect the use effect of the screw pump; 2. The pulverized coal particles will block the coalbed methane well holes, resulting in a decline in production and permeability of coalbed methane wells, which is not conducive to the extraction of coalbed methane

[0005] Nowadays, it is generally used to prevent large particle powder from entering the screw pump by connecting a sand control pipe at the inlet of the screw pump, and to prevent the pump from being stuck by diluting the pulverized coal concentration by injecting water into the annulus of the oil jacket. The concentration of pulverized coal in coalbed methane wells, however, this method cannot fundamentally solve the problem

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