RU2473806C1 - Method to mine steep beds by well hydraulic production with ancillary mining of methane - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: method includes mining of a coal bed by chambers in an ascending order by a hydraulic method from surface and using underground mines, drilling machines, hydraulic monitors, and also a hydraulic elevator. At first a well is drilled from surface to the bed at the side of the roof, where pipes are placed for the hydraulic monitor, hydraulic elevator and methane suction, afterwards coal excavation starts in a split slot. Then another well is drilled in the produced slot along the coal bed, where pipes are installed for the hydraulic monitor and methane suction. Besides, in process of coal excavation in a chamber along bed rise with usage of underground mines the coal pulp arrives to an accumulating drift, which replaces the hydraulic elevator. At the same time methane is also sucked along the pipes to the surface.

EFFECT: wider area of method application, higher safety of minerals mining.

4 dwg

Description

The invention relates to the mining industry and can be used in the development of steep coal seams of borehole hydraulic production with the associated production of methane to the consumer, for example, during the mining of abandoned pillars of coal with high gas content, the development of which for one reason or another cannot be done by traditional methods.

A known method of developing coal seams of borehole hydraulic production (RF Patent No. 2368783, Е21С 45 \ 00, application. 2006.01. A method of developing coal seams of borehole hydraulic production), where the mineral is destroyed by a high-pressure jet of water, and the resulting pulp along with methane is delivered to the surface using a hydraulic elevator .

The disadvantage of this method is that it does not provide effective mining of steep coal seams.

Closest to the invention in terms of technical nature and the achieved result, adopted as a prototype is a method in which coal is mined from the chambers by the fall of the formation. As coal is mined and after drilling through the abandoned wells, methane is exhausted entirely from the worked out space (RF Patent No. 2415266, Е21С 41 \ 18, application. December 14, 2009. Method for removing coal from chambers with associated methane production).

Along with the advantages, this method has disadvantages:

- a large amount of preparatory work;

- hazardous working conditions due to possible methane explosions.

The objective of the invention is to eliminate the above disadvantages of the prototype and thereby creating such a method of coal extraction, which will allow for the integrated and rational use of coal in the bowels by expanding the scope of the method, the safe development of minerals.

The essence of the invention lies in the fact that in the method of developing steep coal seams of borehole hydraulic production with associated methane production, which includes mining the coal seam in an ascending order hydraulically from the surface and using underground workings, drilling machines, hydraulic monitors, and hydraulic elevators, first from the surface they drill a well on the formation from the side of the roof, into which pipes for a hydraulic monitor, a hydraulic elevator and methane suction are placed, after which coal is excavated in a split slot then another hole is drilled into the formed gap along the coal seam, into which pipes for a hydraulic monitor and methane suction are installed, and when coal is excavated in the chamber to raise the seam using underground workings, the coal pulp enters the accumulating drift, replacing the hydraulic elevator, along with methane suction pipes to the surface.

The method is illustrated by drawings, where in Fig.1 shows a diagram of the development of a steep seam borehole hydraulic with associated methane production; figure 2 is a section aa in figure 1; figure 3 is a diagram of the development of the reservoir during underground preparation; figure 4 is a section bB in figure 3.

The method of developing steep coal seams of borehole hydraulic production with associated methane production is as follows. First, a well 1 is drilled from the surface from the top of the formation, into which pipelines 2, 3, 4 are installed with pipes for supplying water to the hydraulic monitor 5 with nozzle 6 and to the hydraulic elevator 7 to dispense pulp to surface 8. A sealed chamber 9 is mounted above the well 10 between the wall of the well and the cylindrical part of the chamber are concreted, since methane is supplied through the well and the sealed chamber through a pipe 11 to the consumer. Then with the help of a hydraulic monitor begin to produce coal in the split slit 12.

Next, a second well 14 is drilled from the surface into the slit 12 along the coal seam 13, into which a hydraulic monitor 15 with a nozzle 16 is installed. An airtight chamber 17 is also mounted above the well, the gaps of which 18 are also concreted.

The extraction of coal by a hydraulic monitor 16 is carried out following the uprising of the formation 13 with the formation of a chamber 19 and inter-chamber pillars 20. The coal beaten off by the hydraulic monitor 15 together with water enters the split slot 12 and then is delivered to the surface using a hydraulic elevator 7.

As coal is mined in the chamber 19, the pipeline becomes less, and methane through the well 14 enters the sealed chamber 17 and then to the consumer.

In the underground preparation of the coal seam 13, instead of a split slot 12 and a hydraulic elevator 7, a storage drift 22 is carried out from the pit 21, into which a well 14 is drilled from the surface and into which a hydraulic monitor 15 with a nozzle 16 is installed. An airtight chamber 17 is also mounted above the well, the gaps of which 18 also are concreted.

The coal beaten off by the hydromonitor 15 together with water flows by gravity to the accumulating drift 22 and then also by gravity to the pit 21. At the same time, methane is sucked through the well 14.

After the completion of the work on the extraction of coal in the chamber and the extraction of methane, all equipment is rearranged for the extraction of coal and the extraction of methane from another chamber.

Claims (1)

A method for developing steep coal seams in borehole hydraulic production with associated methane production, including mining the coal seam in ascending order hydraulically from the surface and using underground workings, drilling machines, hydraulic monitors, and a hydraulic elevator, characterized in that the wells are first drilled from the surface into the formation with side of the roof, in which pipes for a hydraulic monitor, a hydraulic elevator and methane suction are placed, after which they begin to excavate coal in a slit, then into the formed another hole is drilled through the coal seam, into which pipes for a hydraulic monitor and methane suction are installed, and when coal is excavated in the chamber to raise the seam using underground workings, the coal pulp enters the accumulating drift, replacing the hydraulic elevator, and simultaneously methane is sucked through pipes to the surface .

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