SU1659659A1 - Method of traversing an outburst-prone coal seam by mine working - Google Patents

Abstract

The invention relates to the development and inclined outburst of carbon lasts. The goal is to reduce labor costs and cost of cross-section of the seam mine workings (GW) and increase safety of work. The passage t GW to outburst formation. Form a fire plug. Exploration wells (C) of two types are drilled from HB to reservoir. According to Drilling C data, the reservoir thickness, the volatile yield of coal, the gas release rate, the gas pressure in the reservoir, and the strength of the coal are determined. The first type C is drilled from the bottom of the GW to a normal formation at a distance from it equal to 2-3 given diameters of GW to a depth of 1.5 -2 diameters of this GW with a distance of mech C determined by the calculated form / e. According to the first type C drilling, the reservoir thickness and physical x-ki coal will be determined. Then the second type is drilled, the length of which and the distance between them are calculated by the formulas. According to the drilling data of these Cs, the type of HS intersection of the formation is selected. t with the execution of blowout measures at the site of this development of a certain length, calculated by the appropriate formula. When volatile out of coal is more than 35% or the formation thickness in the narrowest zone is less than 0.3 m, the maximum initial gas release rate is equal to or less than 2 l / min, the strength of coal is on the scale of M M the seam less than 0.4 MPa, the layer is crossed as non-flat. To reduce the length of HB sections crossing the TR reservoir, in front of the reservoir, reduced height is observed on the soil side of the reservoir, & behind the reservoir - reduced height from the roof of the reservoir. In this case, the length of the sections of HS with the measures taken is determined according to the corresponding calculation formulas. 1 з.п f-ly, 3 ill. About the joint venture

Description

The invention relates to the mining industry and can be used when crossing outburst hazardous flat and inclined seams and seams by mine workings.

The purpose of the invention is to reduce labor costs at the intersection of the reservoir, increase safety of operations and reduce the cost of blowout preventive measures.

Figure 1 shows a diagram of the approach of mining to the intersected reservoir; Fig. 2 is a diagram of the direct intersection of the reservoir by generation; on fig.Z - section a -A on fig, 2.

In FIGS. 1 to 3, the notation 1 generation is suitable for intersecting formation 2; 3 - generation, reduced height from the roof of the reservoir, is carried out behind the reservoir; 4 — development of the total cross section after the formation; 5 - generation of reduced height from the side of the soil of the formation, carried out in front of the formation; 6 - exploratory wells of the first type; 7 - exploration wells of the second type.

Fig. 2 shows the opening production 1 at the moment when its bottom (a - a) is at a given distance (a - a) normal to the formation. Then, the development is carried out further from the bottom height (a - b) until the approach of production 5 to the reservoir at a given distance (c - c). After crossing the reservoir to the total cross section from (s - s) to (dd) in the mode of rotor blasting or with the performance of blowout preventive measures, generation 3 is again carried out with a reduced height (d - e) until (h - w) . After that, the production of 4 is carried out with a conventional cross section (h - h).

The method is carried out as follows.

Production 1 passes, when production 1 approaches formation 2, a rock plug forms, and from a distance (2–3) of the given production diameters dnp, exploration wells 6 of the first type are drilled. The wells of 6 holes are drilled from the well production normally to a reservoir with a depth H equal to (1.5 - 2) dnp, through the distance LI, determined by the formula

where m is

reservoir thickness, m, through resto -2 (Inp + mXcostf -erg / - sin a), m. (3)

When the reservoir 2 is crossed, exploration wells 6, 7 first determine and then refine the reservoir thickness and predicted physical characteristics of the coal (output

volatiles from coal, the initial rate of gas emission, coal strength on the scale MM MM horse produs f, gas pressure in the reservoir P).

At a distance to the reservoir along the normal

adopting a cross-over method; and carrying out generation through the reservoir. If the volatile yield is more than 35% or its power in the narrowest zone is less than 0.3 m or 2 l / min,

f 0.6, P 0.4 MPa, the intersection is carried out as a non-hazardous formation. When the volatile yield is less than 35%, the power is more than 0.3 and the value of one of the indicators is 2 l / min, f 0.6 or P 0.4 MPa

the interlayer intersection method is based on its thickness in the narrowest part.

When the power is not more than 0.45 m, the formation is crossed using blasting.

in the mode of competitive blasting without additional measures. At working capacity (m 0.45 m), the intersection is carried out with the implementation of additional anti-blowout measures. Length

areas of application of explosive blasting and blowout preventers are determined by phomulae

I et

L-Bblff -

2 + dnp / cosa sin a

m

(four)

1scv.1

 etc

sincr

M

where ICKB.I is the depth of the drilled prospecting Well at the first stage, m;

Inp — distance from which they begin to cross the reservoir using the accepted method, m;

a - bedding angle, hail, and the formation thickness and physical characteristics of coal are specified.

After the wells intersect, the formations 2 begin drilling the wells 7 of the second type at an angle ft to the horizontal depth I, which is determined by the formula

12

(1R + m) cos a sin /

m,

(one)

where dnp m

reduced output diameter

, pr. 4 + dnp / COS

iir sin a

m

(five)

50

55

In order to reduce the length of sections of the production intersected by the reservoir where it is planned to perform blowout measures, production 5 in front of the reservoir is held at a reduced height hn from the side of the reservoir soil until its bottomhole (in - c) approaches the reservoir normal by in - in 1Pr). After that, the development is carried out on the full cross section (c - c) using the adopted method on the section (c - e) (see Fig.2). Then the generation 3 behind the reservoir is carried out with a decrease in height from the roof of the reservoir without measures

on the plot (e - g). In this case, point e and point z are determined by two indicators, when the normal to the reservoir (e - e) and (g - h) is 1Pr, and the height of the bottom holes of production 3 (d - e) is pc, and production 4 (s C) is equal to dnp.

The length of the section c - d, where the implementation of measures is necessary, is determined by the formulas

LlSTPp: UStf - (2dnp - hK - hn) ctg a, m

(6)

LSSpMep LgBpM6p - (2dnp - hK - hn) ctg a. m,

(7)

where hK and hn - height of generation of reduced height, respectively, from the side of the roof and from the side of the soil layer, m.

As a blowout preventer, for example, the method of hydrofluorization of a coal seam can be applied.

In order to facilitate the construction of workings of reduced height (3.5), the following is recommended. From the bottom of the production of 3 dr t long wells (2 - 3 pieces) for the entire length of the production of reduced height 5, after which they are blown up in one cycle. This greatly facilitates the development of a reduced height. The number of wells, the volume of explosives charged in them, is determined by the drilling and blasting data sheet depending on the properties of the rocks, the size of production and other technological factors.

Formula inventions

1. A method for intersecting a coal-emitting hazardous formation with a mining output, including carrying out production, formation of a plug, drilling exploration wells, determining the thickness of the formation, volatilization of coal, gas release rate, gas pressure in the reservoir and coal strength, selection of the type of formation crossing mine excavation along the seam, characterized in that, in order to reduce labor costs at the intersection of formations, to improve work safety, exploration wells are drilled of two types, the first of which is drilled due to normal production of the reservoir at a distance from it equal to 2-3 given diameters of production to a depth of 1.5-2 diameters of this production with the distance between the wells, determined by the ratio

Li

ICKB.I - li

sin a

np

where 1c "B1 is the depth of the drilling exploratory well in the first stage, m; h

1pr - the distance from which they begin to cross the formation of the reservoir using the accepted method, m;

a is the bedding angle, hail, and specify the reservoir thickness and physical characteristics of the coal, then the second type of well is drilled with a length

(Inp + m) cos a 12 sln / 3

where m is the thickness of the seam being opened, m; p is the angle of inclination of the wells to the horizon, degrees, at a distance from each other

Claims (2)

1.2 (Inp + mXcosa -ctg ft - sin a) and carry out the intersection of the reservoir by in-mode generation of competitive blasting over a length of 25 i sotr. 2 + dnp / cos a IWsfoa Ml where dnp is the reduced output diameter, m, at a reservoir thickness of not more than 0.45 m, at a reservoir thickness of more than 0.45 m, the intersection of the reservoir is carried out with the implementation of anti-emission measures at a section of this production LSE .mer. 4 + dnp / COS sin a m 0 and when volatile out of coal is more than $ 35 or the thickness of the reservoir in the narrowest of not less than 0.3 m and the maximum initial gas release rate is 2 l / min, the strength of the coal on the MM scale is f 0.6 The gas pressure in the reservoir P 0.4 MPa is crossed as non-hazardous. 2. The method according to claim 1, characterized in that, in order to reduce the cost of anti-blowout measures by reducing the length of the production areas crossing the coal seam, the production in front of the seam passes a reduced height from the side of the soil of the seam height from the roof. the length of the area of production with the measures taken is determined by the formulas Cyn-LSSU - (2dnp - h - hn) ctg a. LBngpMep L gpMep - (2dnp - hK - hn) ctg a, where hn, And - the height of generation of reduced height, respectively, from the side of the soil and from the side of the roof, m one/ fig1 FIG. 2 A-A U / L