SU617598A1 - Method of winning coal seams inclined to sudden outbursts of coal and gas - Google Patents

Description

one

FIELD OF THE INVENTION The invention relates to the field of the mountain industry, namely to methods of coal seizure using a shaft-free method with the aid of artificial coal emissions.

There is a method of developing very thin steep coal seams prone to sudden coal and gas emissions, consisting in carrying out field drifts, opening one of the workings, excavating coal, in delineating excavation poles by wells drilled from the vent to the transport horizon from field drifts to the middle each pillar, leaving the pedigree plug, and conducting the crosscut, from the bottom of which a hole was drilled at the full thickness of the reservoir;

The disadvantage of this method is the possibility of an outburst during the presence of people in the face.

A known method of developing coal seams is that a well is drilled from the earth's surface to the coal bed, a rotating element is inserted into the well, which has a through channel for fluid flow; “At the lower end of said element, there is a cutter elongated to the side and equipped with a mechanical drive. The descent of the rotating element

produced until the cutter is in contact with the coal seam. The revolving element and the cutter cut coal pieces from the developed field, then flush the washing liquid having a specific weight from 1.1 to 2.5 and viscosity conditions from 36 to 80 seconds per 1 liter, into the reservoir being developed, thereby water-saturated drilled coal slurry. Then remove the water-saturated suspension on the surface 2.

However, this method of development is applicable only to the development of powerful and steeply dipping coal seams and is costly.

The aim of the invention is to ensure a reduction in the cost of coal production, improving the safety of operations during excavation of layers prone to sudden emissions of coal and gas, and the possibility of excavation of low-thickness formations in a mine-free way.

This is achieved by using a liquefied gas that has a high ability to adsorb coal, such as carbon dioxide, as a working agent, to monitor the outburst situation of the working section of the reservoir, to initiate a coal outburst, and, when the outburst situation is reached, they release pressure

products of destruction produce sealing of the developed space by hardening a bookmark through waste wells from the day surface, while monitoring the creation of an out-of-danger situation in the working area of the formation is carried out by measuring the gas pressure in the wells of adjacent areas.

FIG. 1 shows a vertical section of the line of wells; in fig. 2 - the same in terms of.

The method is carried out as follows.

From the day surface into the coal seam 1, the well grid 2 is drilled. The distance between the wells is equal to the size of the excavation area. The wells are surrounded by steel pipes 3 and the wellhead is fitted with valves 4. Liquefied gas is pumped into the well, which has a high ability to adsorb to coal, for example carbon dioxide. The amount of carbon dioxide injected is determined by the parameters of the creation of the outburst-hazard situation in the developed section of the reservoir. Control over the creation of an outburst-prone situation is conducted by measuring the pressure of gas in wells adjacent to the areas being worked out, including the "spent" ones. After the process of bringing a part of the coal seam to the outburst-hazardous condition is completed, the carbon ejection is initiated by an abrupt pressure relief through the gate 4. The ejection resulting from the ejection of the coal in the reservoir through the exhausted wells is filled with a hardening tab 5 in order to prevent gas leaks from working out. waste areas of the reservoir. After that, the transition t to the excavation of the next section.

When using the proposed method of coal seizure, the cost of coal production is reduced by using natural forces, the safety of oriental seams, prone to sudden outbursts of coal and gas, is greatly increased by unmanned excavation and the possibility of gently sloping low-thickness seams is provided.

Claims (2)

1. Method of excavation of coal seams, prone to sudden emissions of coal and gas, which consists in drilling from the surface into the coal seam of wells, the destruction of coal, the injection of working agent and the extraction of minerals to the surface along the well, characterized by that, in order to ensure a reduction in the cost of coal production, increase the safety of operations when excavating layers prone to sudden emissions of coal and gas, and expand the scope of application due to the extraction of low-thickness seams without a shaft mine, a high-efficiency gas is used as a working agent. the ability to adsorb to coal, for example carbon dioxide, control the outburst-hazardous situation of the developed section of the reservoir, initiate the ejection of coal and gas and, upon reaching the outburst-hazardous situation, dump The pressure, and after the issuance of surface degradation products manufac m sealing gob settable laying waste through the well from the surface. 2. A method according to claim 1, characterized in that the control of the creation of an outburst hazard situations in the developed section of the reservoir are carried out by the gas pressure in the wells of adjacent areas. Sources of information taken into account 1. USSR Author's Certificate No. 501162, cl. E 21S 41/04, 1974. 2. US patent number 3881775, cl. 299-18, published. 1975. -f