Extraction pipe, extraction system and downwards-drilling extraction method

Abstract

The invention discloses an extraction pipe, an extraction system and a downwards-drilling extraction method. The extraction pipe comprises a wall protection sleeve and a ventilation pipe, wherein the wall protection sleeve and the ventilation are abreast and fixedly arranged, a first opening is arranged on the lateral wall of one end of the ventilation pipe, a second opening is arranged on the wall protection sleeve at the corresponding position, and the first opening and the second opening are communicated. The ventilation pipe and the wall protection pipe of the extraction pipe are communicated through the first opening, and other portions of the ventilation and the wall protection sleeve are not communicated. In an extraction process, the ventilation pipe and the wall protection sleeve form a communicating vessel, so that deposited water in the wall protection sleeve can be extracted easily. After water is extracted, gas in coal seams can enter the wall protection sleeve via through holes on the wall protection pipe. Thus, gas extraction concentration is improved.

Description

Technical field [0001] The invention relates to gas drainage technology, in particular to a drainage pipe, a drainage system and a downward drilling method for drainage. Background technique [0002] In coal hole production, the coal seam is generally located below the rock layer. Before coal mining operations, the gas in the coal gas needs to be drained to ensure the safety of production operations. In the prior art, a downward drainage process is used to extract gas, and the process specifically includes the following steps: drilling down from the rock area to a set depth in the coal area; lowering the wall casing throughout the process; and sealing the hole; Connect the end of the protective wall casing in the tunnel with the drainage pump; perform drainage. The sealing depth is 5m with reference to Article 50 of the Regulations on Prevention of Coal and Gas Outburst. [0003] Refer to the structural diagram of the existing protective sleeve figure 1 , The protective wall slee...

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Problems solved by technology

[0004] There are at least the following problems in the prior art. In some cases, the coal seam contains rich water, which enters the wall casing through the through hole and deposits, blocking the through hole, and the gas in the coal seam cannot enter the wall casing In this way, the concentration of the extracted gas is greatly reduced, and the moisture deposited in the wall casing is difficult to be extracted

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