A multi-cavity segmented downward gas drainage borehole drainage device and method

Abstract

The invention provides a multi-cavity sectional type descending gas extracting, drilling and water draining device and method and relates to the technical field of gas extraction. The multi-cavity sectional type descending gas extracting, drilling and water draining device comprises a plurality of sectional type chambers, a gas filling pipe, a water guiding pipe and a float valve; the sectional type chambers comprise connecting pipes and sectional type partition boards and are sequentially connected; the water guiding pipe communicates adjacent sectional type chambers; the gas filling pipe communicates with a hole bottom sectional type chamber; the float valve and a filter net are arranged in the hole bottom sectional type chamber; when drilling and water drainage are carried out on gas, the device is put in a drilled hole; the hole bottom sectional type chamber is filled with water through the gas filling pipe to open the float valve; the accumulated water in the drilled hole enters the hole bottom sectional type chamber and an upper sectional type chamber through the filter net and the float valve; the hole bottom sectional type chamber is filled with gas through the gas fillingpipe to close the float valve; and gas is continuously filled, water in the sectional type chamber is drained upwards along the water guiding pipe section by section, and the operation is repeatedly carried out after the water is drained. The device and the method solve the water accumulation technical problem of extraction and drilling of descending gas and also have the advantage of being simpleand convenient in operation.

Description

technical field [0001] The invention relates to the technical field of gas drainage, in particular to a multi-cavity segmented drainage device applied to downhole gas drainage boreholes, and a method for using the device to drain gas drainage boreholes. Background technique [0002] Coal is an important mining resource. As the depth of coal seam mining increases, the pressure and content of coal seam gas gradually increase, and gas disasters become more and more serious, threatening the safe and efficient development of mines. At the same time, as a clean resource, gas is used after industrialization Extensively, the extraction of gas is conducive to the realization of high efficiency, energy saving and emission reduction. Around underground gas disasters, the current gas control policy of "draining first, then mining, monitoring and monitoring, and wind to determine production" is usually adopted; at present, coal seam gas drainage is implemented underground in coal and gas...

AI Technical Summary

Problems solved by technology

Around underground gas disasters, the current gas control policy of "draining first, then mining, monitoring and monitoring, and wind to determine production" is usually adopted; at present, coal seam gas drainage is implemented underground in coal and gas outburst and high gas mines, but the following During the construction of drilling holes for gas drainage, due to the hydraulic slag discharge process or the existence of aquifers, a large amount of water often accumulates in the holes, and the accumulated water in the holes blocks the gas migration channels, increases the drainage resistance, and causes gas Poor draw

As for the method of drilling water accumulation in downward gas drainage, compressed air drainage is usually adopted, but the drainage depth of this technology is limited, and deep hole drainage cannot be realized

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