SU1021789A1 - Method of degassing a suit of adjacent steep blowout-hazardous coal beds - Google Patents

Abstract

METHOD OF DEGASING OF THE SUITES OF THE APPARENT CLOSE FIRING EMERGENCY COALS, including drilling from the surface of a vertical well, conducting a field drift and production connecting the field drift with a vertical well, drilling from a field drift underground, well, working fluid, working oil drainage, working drill oil, drilling, drilling, drilling, drilling, drilling from an underground drift, and working fluid. followed by the degassing of the formation through underground wells, characterized in that, in order to increase the efficiency of the degassing of the suite of contiguous steeps ejecting outburst-prone seams, a vertical well is drilled to the lower technical boundary of the mine floor on the side of the lateral side of the extreme in the formation suite, field drifts are conducted through the reservoir mining horizon, from which underground wells are drilled in ascending and descending directions to the intersection the entire suite of layers, the injection of working fluid is carried out successively in all layers of the suite, starting from the farthest from the pale yellow drift, and degassing is carried out simultaneously for all the layers of the suite, while underground Azhinov drilled at an angle P to the horizontal equal to L p -arct (2 ia-sobl ((G 4 fl-S nd I with a distance from one another. equal A. Where p is the height of the notch pillar angle, i oi is the angle of bedding in the suite; F 6 is the pitch distance; a new drift from a coal seam; O is the thickness of the suite, O and b are the efficiency curves of hydro00 CD dismemberment in the directions of maximum and minimum crack opening {Accordingly.

Description

The invention relates to mining and can be used to combat sudden emissions of coal and gas in the development of a suite of contiguous steeply dipping coal seams within developed and prepared horizons.

There is a method of dealing with sudden outbursts by hydraulic dissection through a directionally vertical horizontal well, crossing the steeply dipping coal seam across the strike on the same horizon ij

The disadvantage of the method is that it is not always possible to perform the curvature of the wells in a given area due to the difficulty in execution. In addition, this method does not envisage the development of a well after hydrodisintegration, as well as the use of the vertical part of the well for treating coal beds in the underlying horizons.

The closest in technical essence and the obtained result to the invention is a method of degassing gently dipping coal seams, including drilling from the surface of a vertical well, conducting a field drift and working out connecting the field drift to a vertical well, drilling from the field drift of underground wells, pumping the working fluid through the vertical well in the mode of hydraulic dissection in underground wells with subsequent degassing of the reservoir through underground wells.

The disadvantage of the known method is that when processing through the well of underlying layers, with their horizontal bedding around the well, it is necessary to maintain the pillars in order to preserve its integrity. In addition, the known method has a limited range due to the lack of the possibility of its simultaneous use. calling on several layers.

The aim of the invention is to increase the efficiency of degassing of a suite of contiguous steeply dipping outburst hazardous formations.

The goal is achieved according to the method of degassing the suite of contiguous steepness {) of outburst outburst coal seams, including drilling from the surface of a vertical well, conducting a field drift and generating connecting the field drift with a vertical well, drilling from the drift of underground wells, pumping the working fluid through vertical well in the mode of hydraulic dissection into underground wells followed by degassing of the formation through underground wells; a vertical well is drilled to the bottom of the technical ra

The mine floor is located on the side of the extreme side of the formation in the suite, field drifts are led through the mining formation horizon, from which the underground wells are drilled in the ascending and descending directions to the intersection of the whole. suites of strata, the injection of working fluid is carried out successively in all strata of the suite, starting from the farthest from the field drift, and degassing through underground wells is performed simultaneously for all layers of the suite, while the underground wells drill at an angle of 3 to the horizon equal to

(

 1by

at a distance L from one another

where h is the height of the notch column

coal / с6 - the angle of the layers in

retinue;

 - distance of the drift from the coal seam /

d is the power of the suite; a and b are the radii of hydrodissection efficiency in the directions of maximum and minimum crack opening, respectively. FIG. 1 shows a suite of coal seams, a vertical section, and an outline of the method; in fig. 2 shows section A-A in FIG. 1, in FIG. 3 shows a section BB in FIG. one.

The notation in FIG. 1–3: 1 is a vertical well, 2 is a formation suite, 3 are underground wells, 4 is a field drift, 5 is a bleed and 6 is a crosscut.

The method is carried out as follows.

A vertical well 1 is drilled from the surface to the lower technical boundary of the mine. In this case it is allowed to drill a well onto one, the lowest horizon. The place of its foundation is chosen in such a way that the mining operations on the elevating horizons do not violate its integrity. This requirement is achieved by positioning well 1 at the boundary of the processing of the coal seam extreme in retinue 2 on the side of its recumbent side. The injection of working fluid directly into the coal seams is carried out through underground wells 3, drilled in the formations of the coal seams, at once on two levels in the ascending and descending directions. At the same time, wells 3 are drilled from the field drift 4 near the coal seam near the well 1 before intersecting after the field in the retinue. The connection between wells 1 and 3 is provided by coupling 5, pit 6, and field drift 4.

Underground wells 3 are cased with strong casing. When opening well 1 with production 5, the casing string is cut, the trimmed part is turned away, and a well fitting is installed in its place, by means of which wells 1 and 3 are connected to each other through pipes. The lower part of the casing of the well 1 is plugged.

After that, with the help of ground equipment, the working fluid is pumped under pressure of the working fluid successively into coal seams of two horizons, starting from the farthest in the formation. Opening the natural fractures in the formations, the working fluid spreads along them from the subterranean well along an ellipse (Fig. 3 | depending on the direction of opening the main fracture system, i.e. hydrodissection occurs. After this process is completed, the wells are drilled 4 free liquids in open cracks with further gas pumping, i.e., simultaneously degassing of all coal seams of the suite.

The processing order of the retinue on the next two horizons is descending, which is caused by the specifics of the development of steeply coal beds. Thus, as far as prepares; Hydraulic processing 1 and degassing of the layers are carried out to the development of each horizon. It should be noted that the treatment of each layer on each horizon is necessary, since in this case, in addition to the main purpose of hydroprocessing, the problem of reducing the dust-forming capacity of outburst coal seams is solved.

The angle f at which the underground wells 3 are drilled is determined from the following considerations. In order to uniformly hydrotreat the entire height of the notch pillar ii, the bottom of the underground squaquicines should be located in the middle of the latter in the formation, Fig. 1, i.e.

ig-ib1АЬ

(}

{b-arctg

/ ad-hcos.i {asinotj

where B is the pitch distance. of the outermost coal bed in the retinue, 8 is the power of the retinue, about the bedding angle in

retinue.

When mining a single coal seam (1) has the form

n - 8 7i: h- 9o v

.those. The coal seam adjacent to the field drift 4 must be processed through a personal underground well, drilled on it at an angle. The rock mass can be processed within a radius of 100-150 m. Therefore, to treat the formation formations, a series of underground wells located each other are drilled across the horizon. from a friend at a distance LI, determined by the magnitude of the overlap of the radii of action of the adjacent underground wells, which must be such that the entire height of the excavation column b does not remain untreated in (fig. 3)

.

The advantage of the proposed method is that it allows the formations of coal seams to be processed in advance, following the preparation of the horizon for mining, to increase the efficiency of hydrodisecting coal seams by using a combination of wells and the simultaneous execution of the fluidization processes of several layers. which reduces the outburst hazard of the layers and their dust-forming ability.

Claims (1)

METHOD FOR DEGASING ENVIRONMENTAL ASSEMBLIES OF WIFE SHARPING EMISSIONING COAL STRESSES, including drilling from the surface of a vertical well, conducting a field drift and production, connecting a field drift to a vertical well, drilling from a field drift of underground wells, pumping a well into a hydraulic fluid through a vertical well subsequent degassing of the formation through underground wells, characterized in that, in order to increase the efficiency of degassing the suites of closely related steeply dipping of hazardous formations, a vertical well is drilled to the lower technical boundary of the mine field from the lying side of the extreme in the formation suite, field drifts are carried out through the horizon of mining the formations from which underground wells are drilled in the ascending and descending directions until the intersection of the entire formation formation, injection of working fluid they are carried out sequentially in all formations of the formation, starting from the most remote from the field drift, and degassing is carried out simultaneously for all formations of the formation, while underground wells are drilled under p glom to the horizontal equal to 1 "p-agCSC ·, id-hcoGdA 'at a distance L, one from the other, equal to where 1n is the height of the extraction column of coal; (ol ~ Formation angle in the suite; 6 - the distance of laying the field drift from the coal seam, * O - power of the retinue, ' О and b are the radii of the efficiency of hydraulic separation in the directions of maximum and minimum crack opening • respectively. , SU „1021789>