SU1756585A1 - Method for mining gassy and outburst-prone strata - Google Patents

Abstract

Usage: mining industry, technology of underground development of suites of gas-bearing and outburst-hazardous layers of minerals. SUMMARY OF THE INVENTION: when mining the formations, first, the protective ones are worked out, and then the degassing and processing of the protected formations are carried out, the drilling of the formations is carried out in sections separated by coal pillars, width 2 x (2 - 3) I, where I is the width of the reference zone pressure, on the protected reservoir, degassing a region of size K hctl 5i, 2,3,4 + (2 - 3) I, where h is the distance between the protected and protective reservoirs along the normal, 61,2,3 / corresponding coal) protection, degassing start by drilling wells from drainage workings at the approach of the clearing-hole section to aziruemoy area by a distance L (2 - 3) 1. Drainage openings are carried out in the roof or soil of the protected formation for distances of at least 3b, where b is the width of the drainage excavation. 1 з п. Ф-лы, 2 Il. (Ls

Description

The invention relates to the coal industry and can be used in the development of formations of formations containing gas-bearing formations, as well as formations that are prone to gas-dynamic phenomena,

There is a known method of regional control of rock pressure and gas evolution in the development of formations of beds, including the advance testing of protective beds and the implementation of measures in areas unloaded from rock pressure. The sequence of reservoir mining is predicted by the formula K 1.67-0.67 h / Sj, where h is the interfacial thickness, S is the parameter of the protective action range.

The known method has the following disadvantage: protective measures and protective effect are achieved only in contours constructed in accordance with the instruction, therefore mining areas on the protective formation should be without separation pillars and be worked out ahead of the protected ones. Therefore, the development of protective layers inhibits and slows down the development of protected layers. , often the most productive and productive, therefore the introduction of protective layers did not receive widespread

There is a method of degassing the suite of thin gentle seams, including the testing of a protective layer and drilling degaseh |

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wells to a degassed formation, which is carried out from degassing workings at an angle of complete displacement of rocks.

The known method does not provide advance development of protective seams, although it slightly increases the pace of their development of protective seams, although somewhat increases the pace of their development, due to interception of methane during its migration in areas of displacement towards the protective seam.

The purpose of the invention is to improve the safety of work through the operational creation of protection and degassing of productive gas-bearing and outburst-hazardous formations.

This goal is achieved by the fact that the testing of protective layers is carried out in sections, for example, pillars with a flat bed or stripes with a steep bed, separated by coal pillars, whose width is set to B 2 x (2 i - 3 I), where I is the width of the reference zone pressure, and so the time of mining of the protective layer is degassed on the protected layer a region adjacent to the protected zone, of size K h ctg 5 |, 2, h, 4 + (2-3) i, where h is the distance between the protected and protective plaque, 61,2.3.4-appropriate angle of protection, and begin to degassing at the approach creates a stope degassed area by a distance L (2 - 3).

The degastation of the protected tasc is carried out from the drainage field workings carried out in the soil or the roof of the protected formation at a distance of not less than 3b - where b is the width of the drainage excavation, so that its axis is located entirely away from the contour of the notch of the corresponding section not less than Ki hictg (/ y, 3), where hi is the distance from the drainage excavation to the protective formation, /, y, e are the corresponding displacement angles

Figure 1 and 2 are diagrams illustrating the proposed method.

In order to ensure safe mining of the outburst and gas bearing layer 1, the protective layer 2 is processed. Since the productive layer 1 needs to be commissioned as soon as possible, two columns 3 and 4 are prepared at distance 2 I - 31, where is the width of the reference pressure zone, defined according to the relevant instructions from the nearest contours of future lavas 3 and 4. In the presence of sandstone in the rocks, the interplast is more than 40% - 31. As a result, a pillar 5 is formed, subsequently worked out, in a convenient period, Then lavas 3 and 4 are worked out, at this m

Degas the zones K adjacent to each of the lavas. Zone K is determined as follows. On the protected seam 1, the contour of the protective zone 6 is applied from the

of the lava 3 on the protective stratum 2, the K section is laid off from the contour of the protective zone 6 towards the rear pillar 5 and, thus, the dynamic zone of increased rock pressure (GHDD) is determined, in which

At the passage of the tunnel 3, the fracturing and persigtion are activated, and the degassing process is carried out successfully. In this zone over the whole, at the approach of the hole 3, the degassing wells 7 are drilled, they are surrounded with perforated pipes, and when the lava approaches the distance (21-31) they begin to degass in the zone K adjacent to the lava 3. The wells 7 can be drilled from any convenient development either from the surface. In the same way, the zone K of the reservoir 1, adjacent to the protected zone 6 from the lava 4, is brought to a safe condition. The most efficient way is to carry out the degassing from the field excavation 8 carried out near the reservoir 1 above

or under it at a distance of no closer than 3 b, where b is the width of the excavation. This drainage excavation may be used later on during the mining of reservoir 1, as an operational one. For her safety

have outside the zones of displacement of love 3 and 4, defined as Ki hictg (/, y, 5). If reservoir 1 is prone to dynamic phenomena, in zones K, as the faces of the lavas 3 and 4 approach to removal (2 - 3 I),

Moisturizing the coal in the cracks that are formed My drilled expansion wells. If necessary, a more complete removal of gas IIDO- ood t hydraulic fracturing.

The method is carried out as follows.

It is necessary to prepare for the development of a highly productive gas-bearing and exhausted reservoir. To do this, make a decision about his undermining by the Kyu layer,

5 prepared and worked on the pillar scheme, with the location of the columns along the strike according to the following scheme. The length of the reference pressure zone is 23 m. Since the distance between Ki2 and Kyu is 40 m and there is no sandstone among the rocks, the formula is used and 2x31 138 m is determined - the distance between parallel columns with a width of 120 m and a length of 900 m,

5 After that, the boundaries of the protected zones are constructed and the extent of the zone of influence exerted by the lava of each pillar is determined when it is mined in the active phase of displacement of rocks. For this, the K 40 x ctg 80 ° 76.2 m is determined.

the width of the formation strip that is adjacent to the protective zone and when approaching the distance to a distance of 69 m must be degassed. The same zone is located on the side of the adjacent pillar. Degassing is made from the contouring pillars of the workings - drifts, for which wells are drilled into the drifts to the specified lane of the overlying stratum with the SBT-1M machine with a diameter of 100 mm, so that the degassing radius is 10 m. ceramic perforated pipes and connected to a vacuum network.

To speed up the preparation, the Ki2 reservoir conducts field drifts, -They are positioned above the pillars at a distance from the contour drifts no closer than Ki hictg 70 ° 15 m away from the reservoir into the soil of 12 m, where b is the width of drifts. Initially, they are used as drainage and fan wells are drilled from them, and then, after reducing the gas content of the formation bands by 0.25, the initial, degassing pipelines are dismantled. In areas of low gas permeability, in the zone of tectonic disturbances, to initiate it, hydrofrozing is used, which is carried out at the approach of taking the nearest column at 69 m. The preparation time of the Ki2 reservoir increases by a factor of 2 with a high degassing efficiency and a high preparation rate.

Compared with the known application of the proposed method provides a higher efficiency of production, due to the fact that the rate of preparation and development of the productive formation increases in the protected and degassed zone.

Claims (2)

1. The way to develop a suite of gas and outburst seams, including s f y; 4 / A. - / - 2fcf- 3fl-lrf afcii t ten five 0 five 0 five 0 advanced mining of protective seams, outgassing of the massif in unloading zones formed as a result of rocks moving from drilling out of drainage wells to a degassed formation from outgassing workings, characterized in that, in order to improve work safety by quickly creating protection and outgassing productive gas and oil outflows formations, the testing of protective formations is carried out by pillars with a gentle bedding or by stripes with a steep occurrence of the layers, separated by pillars of the angle, the width of which is set In dependence of ayut 2 x (2 - 3), where t - the width of the reference pressure zone, wherein during execution of the protective layer, the formation on the protected degassed region adjacent to the protected area size K - h ctg 61.2,3.4 + (2 - 3) I, where the distance between the protected and protective layers is normal; 5i, 2, з, 4 - corresponding angles of protection, you, at the same time, degassing begins at the approach of the shaft of the clearing slab to the degassing region to the distance L (2–3) 1, 2. The method according to claim 1, characterized in that the degassing of the protected formation is carried out from the drainage field workings, which are carried out in the roof or soil of the specified formation at a distance of not less than 3b, where b is the width of the drainage generation, while the generation is provided so that its axis is located above the entire left on the protective layer, at a distance from the contour of the corresponding section not less than Ki hi ctg (/ 3, y, 5), where hi is the distance from the protective layer to the drainage working; (3, у, д - corresponding angles of rocks displacement. / 77 ////// A afcii t fer.l V