Anti-clogging Fine Control Regulating Valve for CBM Wells

Abstract

The invention belongs to the field of coal-bed gas exploitation and particularly relates to an anti-blocking fine control regulating valve for a coal-bed gas well. The anti-blocking fine control regulating valve for the coal-bed gas well comprises a drying and filtering module, a regulating work module and a springback-preventing module, wherein a gas inlet end of the drying and filtering module is connected with a gas producing pipe orifice of the coal-bed gas well, a gas outlet end of the drying and filtering module is connected with a gas inlet end of the regulating work module, a gas outlet end of the regulating work module is connected with a coal-bed gas collecting manifold, the springback-preventing module is mounted in the regulating work module, the drying and filtering module primarily filters gas entering the regulating valve and utilizes two oil nozzles, the regulating work module adopts a fine-pitch thread and gear combined structure, and the springback-preventing module adopts a ratchet wheel structure. With the adoption of the anti-blocking fine control regulating valve for the coal-bed gas well, the freezing and plugging phenomena caused by throttling temperature drop effects are reduced, the flow state of gas after throttling is more stable, a valve core is prevented from springback, and fine control can be realized through fine adjustment; by means of a filtering device, flow fluctuation caused by water and fly ash is reduced.

Description

technical field [0001] The invention belongs to the field of coal bed gas exploitation, and in particular relates to a coal bed gas well anti-clogging fine control regulating valve for adjusting gas flow. Background technique [0002] Coalbed methane exploitation is a process of water drainage and pressure reduction. The pressure drop of coal reservoirs is achieved through drainage, that is, using drainage equipment, oil pipe drainage, and casing gas production. When the gas pressure in the casing reaches a certain value, then Slowly adjust the opening of the spool of the needle valve to discharge and adjust the gas flow. The opening of the needle valve is one of the data that must be recorded in the coalbed methane well every day, and the success or failure of the needle valve opening and closing is related to the increase of gas production and the protection of the reservoir. [0003] At present, because most of the coalbed methane well sites are located in mountainous ar...

AI Technical Summary

Problems solved by technology

[0003] At present, because most of the coalbed methane well sites are located in mountainous areas, the working conditions are harsh and the coalbed methane contains moisture and coal powder, etc., there are still many problems in the actual application of needle valves, such as: the degree of switching is difficult to control; due to the sealing rubber Due to the existence of rings, the valve core is prone to rebound after rotation; single-stage throttling makes the gas flow state in the valve change suddenly, and the coalbed methane contains water and coal powder, which will easily lead to freezing of the needle valve when the temperature is low

The control accuracy of the needle valve is reduced, and the gas flow fluctuates in a large range, which seriously affects the fine control of coalbed methane drainage and production, resulting in a slowdown in the production speed of coalbed methane and a great reduction in work efficiency

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