SU750108A1 - Method of degassing coal bed satellites - Google Patents

Description

The invention relates to the mining industry and can be used for the degassing of contiguous formations.

There is a method of degassing coal deposits, which consists in passing through a satellite coal seam horizontal part of a directional well, constantly located in the unloaded zone.

The disadvantage of this method is the destruction of the wellbore of such a well during the passage of lava.

The known method of degassing coal satellites mainly in continuous and columnar development systems consists in penetrating the chamber, drilling gas-drainage wells from it, and creating ka to the treated part of the gas drainage network (shone wells 2.

The disadvantage of this method is the relatively low efficiency of degassing operations and the high economic costs of well equipment.

The purpose of the invention is to increase the efficiency of degassing works, reducing the economic costs of equipping well.

For this, according to the proposed method: a directed well is carried out of the chamber until it intersects with the satellite, its horizontal part is held so that it is constantly outside the unloading zone, J and additional artificially bent wells are drawn from the straight horizontal part of the well. in the unloaded zone.

FIG. 1 depicts a mining plan with a concept of degassing of the sputum of coal seams in a directional well with additional artificially bent trunks in the unloaded zone; in fig. 2 shows section A-A in FIG. one.

The method of degassing coal satellites is carried out as follows.

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From generation 1 (for example, slope), prior to commencing work, the chamber 3, equipped for long-term operation and placement of a powerful drilling unit, is being prepared and carried out on the floor of the excavation of coal from formation 2. From chamber 3, a directional well is drilled, consisting of the artificially curved section 4 and the straight section 5. The linear section is conducted via satellite 6 or parallel to the satellite through rock in zone 7, which will not be unloaded during the development of the reservoir. The linear portion of well 5 is perpendicular to the position of the lava when mining the coal seam 2.

From the straight part 5 of the directional borehole, which is the main bore, artificially curved additional trunks 8 are led, which extend into the future unloading zone 9.

Drilling work is carried out simultaneously with the mining of the overlying floor 10 prior to the start of penetration, or simultaneously with the driving of the haulage shaft 11.

Taking into account that during degassing, the main wellbore will play the role of a main pipeline, the diameter of sections 4 and 5 should be greater than the diameter of the bore 8. The sequence of carrying out additional bore 8 may be any, depending on the means used and the technology of artificially curvature boreholes. Either the entire main trunk is drilled first, and then additional, or first, a part of the main trunk to the first additional core, then an additional trunk, and then again a section of the main trunk to the second additional, etc.

The proposed method can be applied for both continuous and pillar-based development systems. In the first case, degassing will be carried out as the lava moves through additional trunks closest to the mouth of the main trunk, and in the second, through additional trunks, starting from the bottom of the well 5.

If necessary, in the course of its operation in the well, work can be carried out on partial or complete overlapping of additional shafts or part of the main trunk by installing special plugs.

To isolate cracks in order to reduce the possible leakage of air into the main trunk, it can be drilled with insulating cement slurries.

Using the proposed method of degassing coal satellites, compared with existing methods, while maintaining the amount of methane removed, advance preparation of the floor degassing system, reducing the volume of well drilling on the rock, reducing the volume of laying degassing pipelines and maintaining the existing wells in the waste zone at a considerable distance from the lava.

These advantages fully compensate for the additional costs associated with the complication of well drilling technology and the use of special tools for their artificial curvature.

Claims (2)

1. USSR author's certificate 0 No. 252996, cl. E 21 F 7/00, 1967. 2. USSR author's certificate for application number 2006068 / 22-03, cl. E 21 F 7/00, 1974 (prototype). if A-A