SU1606712A1 - Method of opening-up outburst-prone seam - Google Patents

Abstract

The invention relates to the mining industry and can be used to prevent gas-dynamic effects when the formation is opened by mining excavation. The purpose of the invention is to increase the efficiency and safety of mining by intensifying the discharge and degassing of the array. To do this, the bottom of the excavation generation (HE) is formed inclined parallel to the plane of the formation being opened (VP). From explosives, drilling and degassing wells intersecting the airspace, vibrating wells at a distance from the airspace no more than the radius of the face effective influence and barrier wells (BS) are parallel to the airplanes plane. The vibrating wells are vibrated during the stabilization time of the maximum displacement level. This time is determined taking into account the disturbance of the array and the time during which the offset reaches half of the maximum displacements. A wave shield is formed from the BS by torpedoing and monitoring the effectiveness of torpedoing by measuring the gas pressure in the reservoir and comparing it with the critical permissible by sudden outbursts of coal and gas when the reservoir is opened is measured. If torpedoing is ineffective, the pillars between the BS are destroyed to form a gap. The parameters of this slit are calculated depending on the decrease in the pressure level of the gas in the explosive to the critically permissible maximum displacement level, the distance from the slab of the explosive along the normal to the most distant plane of the EP, the radius of the BS effect. 1 hp f-ly, 3 ill.

Description

The method is carried out as follows.

Control wells are drilled in the bottomhole of the excavating production 3-5 meters before the vibro-hazardous formation through the rock pillar, and the gas pressure in them is measured. Then, clearance is made at the bottoming outfall, for which the bottom-hole from position a-to is moved to the position in -c, i.e. the bottom of the opening outfall is made inclined parallel to the plane of the coalbed. This achieves the relative uniformity of the reservoir discharge. Then, to the reservoir 1, 2 from the intake 1 through the rock plug 3, drills of a group of wells 4, 5, 6. At the beginning, degassing wells 4 are constructed. The length of these wells is taken such that the reservoir completely crosses the reservoir behind its design contour. The number of wells taken from the experience of the discovery of steep seams, for example 6-8. Then, the vibrator wells 5 are drilled without being introduced into the coal seam. The wells are not drilled to the reservoir for a distance not exceeding the radius of the effective influence of the face vibration effect on the plug rocks. After that, barrier wells 6 are constructed to form a wave screen. At the same time, the projections dd and rg of these wells onto the coal seam exceed the cross section of the production of rd by the value of the normative safe excess equal to 4 m. In barrier wells, an array is torpedoed, which creates a wave screen. After the array relaxes from an explosive load after approximately 3-4 hours, the vibrating wells 5 are placed with rigid wedging or filling the well with an incompressible solution, vibration sources 7, for example, pneumatic wells, which create forced oscillations with a frequency of 50-100 Hz and an amplitude of 0.5-1 .

As a result, the formation in the dissection zone increases its volume, is discharged and degassed. To determine the time of exposure to the array, set the duration of stabilization of the maximum level of offsets by the formula. For this, offsets and offsets are measured. According to the measured values of the offset C; slaughter and time t, from the beginning

0 vibrations up to the moments of measurement of displacements plot the coordinate axes x (Fig. 2). The obtained family of points is approximated by a straight line (Fig. 3). The values of segments b and b, cut off straight on the abscissa and ordinate axes, are graphically determined. By the values of the sections cut off on the axes, the maximum displacement of the bottom

20

and time of vibration on the array

  iOOic L

The efficiency of the application of the method is monitored, for example, by the pressure of the gas in the coal seam by a known technique.

In case the gas pressure exceeds the permissible value (for out-of-hazardous coal seams P 1 MPa) or the inability to perform vibration treatment for a specified time, the process of degassing and unloading the coal is controlled by destroying the pillars

between the barrier wells and the formation of a hollow gap in this case, select the parameters of the gap - the wave screen, taking into account the distance to the reservoir, the level and time of the bottom shift in such a way that the inequality

-ost

4- - (1 - Л ,,, ... 53, Л, з, о ,,.,;). | 3,513, (,, jJ, |, J,

and / tg.

e Growth — residual gas pressure level after performing the MPa method;

P is critical for sudden outbursts of coal and gas at the opening of the pressure;

Rpr - gas pressure in an intact coal array, MPa;

Urn - maximum level of bias, mm;

R is the radius of the influence of barrier wells, m;

0 is the integral Gauss function;

d and L are slit parameters, m;

, 55Z + 50; , 43Z-9.

Claims (2)

1. A method to open an outburst-prone reservoir, including the formation of downhole drilling outfall from this area through the rock pillar and the outburst reservoir of degassing wells, drilling in the rock pillars of the wells and installing vibratory sources in them, determining the parameters of vibration and end face effective impact radius vibroinfluence, vibroinfluence on the massif and degassing of the formation during this exposure, measurement of the gas pressure and control of the effectiveness of its reduction in the zone opening the seam pressure to critical for emissions of coal and gas at the opening of outburst formations, characterized in that, in order to increase the efficiency and safety of mining operations by intensifying the discharge and degassing of the massif, the bottom of the dissecting mine is formed inclined parallel to the plane of the reservoir being opened normal to the most distant plane of the formation being opened, the offset of the opening and the maximum level of this mixture In addition, the barrier wells are drilled from the dissecting production parallel to the plane of the reservoir being opened, and the wave shields are formed from these wells, and the vibratory wells do not reach the reservoir to be opened to a distance of no more than the effective vibration effect and vibration in these wells. produced during the time of one hundred ost  -z -: b | 4 -3- 4 2 ")) And ., (J J L and / 71 e Growth - residual level of gas pressure after performing the method, MPa; Рпр - gas pressure in intact coal number of masses, MPa; r is the distance from the normal along the normal to the most distant plane of the formation being opened; Urn - maximum displacement level, mm; j r Rig. one bilization of the maximum level of displacement established by the formula -JQOic and. where to is the time during which the amount of the bottom displacement reaches half of the maximum displacements, h; K-factor accounting violation array, 8-1,2. 2. A method according to claim 1, characterized in that the wave screen is formed by torpedoing an array of barrier wells and monitoring the effectiveness of this torpedoing is performed, and if the torpedoing is ineffective by destroying the pillars between the barrier wells, a gap is formed and the dimensions of this gap are determined depending on the decrease in the level gas pressure in the opened vibro-hazardous zone of the reservoir to the critical for the sudden release of coal and gas at the opening of the reservoir, according to the formula Gauss integral function; the radius of influence of barrier wells; slit parameters, m; critical permissible for sudden emissions of coal and gas at the opening of the pressure, MPa: , 55Z + 5d; , 43Z-9. Hjmm FIG. g i., 1 and mm FIG. five