SU1084464A1 - Coal bed moistening method - Google Patents

Abstract

METHOD OF MOISTURIZING COAL LAYER, including tucking, well sealing and injecting water and surfactant into it, characterized in that, in order to increase the efficiency of moistening by increasing the radius of penetration of the surfactant from the well into the coal mass, surfactant and water injected into the well alternately, and first injected surfactant.

Description

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The invention relates to the mining industry and can be used in pre-moistening of coal plastics to reduce dust generation.

There is a method of hydraulic processing of a coal seam, including drilling, sealing a well and supplying it with fluid in the pressure and pulse modes {.

The underpinnings of such a method are layering and significant exploitation;

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ncr and time costs. Closest to the present invention is a method of moistening a coal seam, including drilling, sealing a well, and injecting water and surfactant 2 into it.

The disadvantage of this method is the low efficiency of moistening due to the small radius of penetration of the surfactant into the coal massif.

The purpose of the invention is to increase the efficiency of moistening of the coal seam by increasing the radius of penetration of surfactant from the well into the coal massif.

This goal is achieved in that according to the method of moistening a coal seam, including drilling, sealing a well and injecting water and surfactant into it, the surfactant and water are injected into the well alternately, and the surfactant is first injected.

The method is carried out as follows.

A well is drilled, it is sealed and alternately injected into it, first a volume of surfactant preliminarily calculated from the condition of supplying the optimal concentration necessary for a given reservoir, and then water. The alternate supply of surfactant and water is repeated until the extracted coal seam to be treated from this well is completely wetted. Other wells are then treated in this manner.

When moistened in the reservoir, surfactant fills large cracks in the near-wellbore zone, and then water pushes the surfactant to the peripheral areas of the volume to be wetted. The surfactant when filtering from the well to the boundaries of the moistened volume of coal is uniformly adsorbed on the walls of filtering and dead-end cracks, the thickness of the surfactant-pushed layer of water decreases, and its boundary with water is eroded. As a result, by the end of the injection, the entire volume of surfactant intended

to treat the well, a uniform (molecular) layer is distributed over a wetted volume of coal over a larger radius. After the completion of the fast-flowing pressure pumping, the process of establishing sorption equilibrium and capillary wetting of cracks with opening less than 5 microns throughout the entire volume of coal to be humidified with surfactant solution with a concentration close to the optimal one begins. All this leads to an increase in the volume of moist small cracks on the periphery of the treated zone and, ultimately, to a decrease in dust generation during the extraction of wet coal, which reduces the dust content of air at workplaces and improves the working conditions of miners.

Claims (1)

METHOD FOR HUMIDIFICATION OF A COAL LAYER, including drilling, sealing a well and injecting water and a surfactant into it, characterized in that, in order to increase the moistening efficiency by increasing the radius of penetration of a surfactant from the well into a coal mass, surfactant and water injected into the well alternately, and first surfactant is injected.