SU1002605A1 - Method of degassing coal seams being worked - Google Patents

Description

(54) METHOD OF DEGASING DEVELOPING COAL STRAYS

The invention relates to mining industrial and can be used for advanced degassing of developed coal seams in mines.

There is a method of degassing developed coal seams, including the drilling of reservoir drainage wells, their sealing and connection to the suction gas pipeline l.

The disadvantage of this method is the duration of the degassing (at least 6 months) and the need to advance a large amount of preparatory workings.

There is also known a method for degassing developed coal seams, which includes drilling taking into account the influence of rock pressure in the bottomhole zone of reservoir drainage wells, their sealing ti connection to the suction gas pipeline 2,

The disadvantage of this method is the low productivity of the well in the zone of influence of the cleaning bottom, due to the filling of the well with coal fines generated from the destruction of its walls.

The purpose of the invention is to increase the efficiency of degassing by increasing the gas evolution on the well "

This goal is achieved by the fact that, according to the method of degassing of coal seams developed, including the drilling of reservoir de-gassing wells, their sealing and connection to the suction gas 10, after entering the well in the zone of influence of the moving clearing slab, it was depressurized by re-drilling the well as before, the old channel was removed by the old well. from the former well 15, the coal fines formed from the destruction of its walls, then it is sealed again, connected to the gas pipeline and the process of methane suction is resumed and from her.

20

The method is implemented as follows.

In the excavation section prepared for excavation from the conveyor or ventilation drift, the reservoir wells are drilled.

25 degassing wells at a distance of 10–20 m from each other, parallel to the clearing-hole line or at some angle (15–20) to it. After drilling, all wells are sealed and connected to the gas pipeline.

The wells, which are in the part of the massif not unloaded from the mountain pressure, at a distance of more than 50-60 m from the clearing site, operate under the conditions of preliminary degassing.

As the lava moves, the wells alternately fall into the zone of influence of the clearing bottom, where elevated concentrations of rock pressure cause the rocks and the coal mass to move. In doing so, the walls of the well gradually collapse and fill it with coal fines. After filling the well with coal fines, further concentration of rock pressure results in compaction of the coal in the well. and around it, which impairs its permeability and reduces the filtering flow of methane.

Thus, when the well is in the zone of influence of the clearing downhole, it is disconnected from the gas pipeline, depressurized and, by re-drilling the well in the old channel, the coal fines formed from the destruction of its walls are removed, then sealed again, connected to the gas pipeline and resumed. are the process of methane suction from it.

The use of the proposed method allows to increase the amount of methane sucked from the reservoir in the zone of influence of the clearing face and increase the safety of mining operations.

Claims (2)

1. Guide to the degassing of coal mines M., Nedra, 1975, p.19-24 2. Mostipak, IA, Preobrazhensk, E..I., Sadchikov, VA Determination of the distance between the degassing wells, taking into account the occurrence of mining pressure - c6.J Gas control | Dividing by means of ventilation and degassing in coal mines. Works VostNII, Kemerovo; 1980, p. 23-27 (prototype).