Gas drainage hole drainage method

Abstract

The gas drainage hole drainage method of the present invention belongs to the field of coal mine gas drainage, and aims to realize the synchronous drainage of upward holes and exhaust gas, so as to extract gas by technology. Step 1, bury the sealing buried pipe upward in the drainage hole; Step 2, assemble the drainage pipe and exhaust pipe with the connecting device arranged at the bottom of the sealing buried pipe; Step 3, start the drainage system, and put the The methane gas is extracted through the exhaust passage; the water in the extraction hole is discharged through the drainage passage under the action of weight. In the gas extraction hole drainage method disclosed in the present invention, the drainage pipe is connected with the sealing buried pipe through the connecting device to form a drainage passage; the exhaust pipe is inserted into the sealing buried pipe through the connecting device to form an exhaust passage; And the design of the outer pipe makes the drainage channel and the exhaust channel independent of each other without interfering with each other, realizes the separation of gas and water, and enables simultaneous gas drainage and drainage of the drainage hole, so as to achieve the purpose of timely gas drainage. And gravity self-flow drainage, easy to control and low cost.

Description

technical field [0001] The invention belongs to the field of gas drainage in coal mines, in particular to a drainage method for gas drainage holes. Background technique [0002] During coal mining, it is necessary to drill gas drainage holes on the roadway surface to extract the gas in the coal seam, so as to ensure the safety of coal mining. During gas drainage, according to the drilling angle, it is divided into upward holes, downward holes and horizontal holes. The holes extending downward from the horizontal surface are called downward holes, and the holes extending upward from the horizontal surface are called upward holes. [0003] At present, deep hole drainage is usually used for gas drainage. Drainage holes are set in the rock formation and extend to the deep part of the coal seam. Water seepage, water gushing and drilling operation water from the rock formation and coal seam around the drainage hole are poured into the drainage. inside the hole. The drainage hole...

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Problems solved by technology

[0004] Traditionally, the automatic water release device is used to discharge the water in the upward hole, and the automatic water release device is automatically controlled by its buoyancy, which is costly, and when the water gushing in the hole is large, the automatic water release device operates frequently, which is prone to blockage and damage. Therefore, in In the drainage holes with large water gushing volume, the drainage system is not connected, and the drainage is carried out after the water volume drops significantly. This will cause some boreholes with large water gushing and gas gushing volumes to be unable to be drained in time

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