Gas extraction hole drainage method

Abstract

The invention provides a gas extraction hole drainage method and belongs to the field of coal mine gas extraction. The gas extraction hole drainage method aims to achieve that drainage and exhaust ofan upward hole are synchronously conducted, so that gas extraction is conducted in time. The gas extraction hole drainage method comprises the following steps that firstly, a hole sealing embedded pipe is buried in the upward extraction hole; secondly, a connection device arranged at the bottom end of the hole sealing embedded pipe is utilized to assemble a drainage pipe and an exhaust pipe; thirdly, an extraction system is started, gas in the extraction hole is extracted out through an exhaust passage, and water in the extraction hole is discharged through a drainage passage under the actionof weight. According to the gas extraction hole drainage method, by means of the connecting device, the drainage pipe and the hole sealing embedded pipe are made to communicate to form the drainage passage; by means of the connecting device, the exhaust pipe is inserted into the hole sealing embedded pipe to form the exhaust passage; by means of design of an inner pipe and an outer pipe of the connecting device, the drainage passage and the exhaust passage are mutually independent and do not interfere each other, gas-water separation is achieved, so that gas extraction and drainage of an extraction hole can be simultaneously conducted, and the purpose of conducting gas extraction in time is achieved; and gravity drainage is conducted, so that control is easy, and cost is low.

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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