An automatic drainage device and method for gas gas drilling and pumping

Abstract

The embodiment of the invention discloses an automatic drainage device and method for gas drilling extraction, and relates to the technical field of extraction of coal mine downhole gas such as gas. The structure is simple, the cost is low, and the problem of water accumulating of a crossing hole can be reliably solved. The automatic drainage device comprises an extraction pipeline, a valve, a float, a gas circuit switch control valve and a drainage pipeline; the first end of the extraction pipeline is arranged in a drilled hole and connected with the valve, the float is provided with an elastic part, the float is connected to the lower portion of the valve through a flexible rope, and a spring is arranged at the axial position of a valve element of the switch control valve; and the switchcontrol valve is further provided with a gas circuit channel, the float is further connected with the gas circuit switch control valve, the gas circuit channel is connected with a gas source, and thedrainage pipeline is arranged at the bottom of the drilled hole. The automatic drainage device and method are suitable for automatic drainage in downward crossing hole extraction of the gas.

Description

Technical field [0001] The invention relates to the technical field of coal seam gas extraction, in particular to an automatic drainage device and method for gas drilling and extraction. Background technique [0002] The existence of coal seam gas in the mine is a major hidden danger that affects the safety of coal mining. At present, the more effective method for coal mines to control coal seam gas is to extract gas through drilling. For down-throwing drainage drilling holes, affected by the hydrogeological conditions in the coal seams and rock formations, there will generally be a certain amount of water accumulated in the drilling holes. When there is too much water, it will reduce or block the gas moving channel and affect the gas drainage effect . Long-term water accumulation in the borehole will cause the wall of the borehole to collapse and damage in the soft coal area, and even cause the borehole to be scrapped, leaving hidden dangers to safe production. Aiming at the p...

AI Technical Summary

Problems solved by technology

The existing above-mentioned system performs regular automatic drainage by controlling the solenoid valve. Although it saves manpower and solves the problem of untimely drainage of accumulated water to a certain extent, because it is used underground in coal mines, there are electrical components and devices in the drainage system. It must have explosion-proof performance, which leads to the complexity of the system and high cost. In addition, the environment in the hole is harsh, and the service life of electrical components is affected. When the electrical components fail in the borehole, they cannot be replaced, which will cause the loss of drainage system function.

[0003] In summary, the existing drainage devices or systems used in gas extraction have complex structures and high costs, and cannot reliably solve the problem of water accumulation in downholes in gas extraction.

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