Protected seam bottom plate upward comb-shaped drilled hole gas extraction method

A protected layer and gas drainage technology, applied in the direction of gas discharge, earth drilling, mining equipment, etc., can solve the problems of increasing the cost of extraction, affecting the mining efficiency and cycle, and the large amount of drilling engineering, so as to improve the gas consumption. Drainage efficiency, shorten the mining cycle, reduce the effect of construction costs

Active Publication Date: 2012-09-12
CHINA UNIV OF MINING & TECH
5 Cites 22 Cited by

AI-Extracted Technical Summary

Problems solved by technology

However, this method needs to arrange one or more rock roadways in the coal seam floor strata, construct a drilling field at intervals in the rock roadway, and construct a large number of upward cross-layer drainage drilling h...
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Abstract

The invention discloses a protected seam bottom plate upward comb-shaped drilled hole gas extraction method. The method comprises the following steps of: performing directional drilling on a protected seam bottom plate; after a drill is lifted, inserting a special packing deflecting device from a hole, and performing upward branch drilling by using a small-diameter large-bent angle hole bottom motor from inside to outside to form multiple groups of protected seam bottom plate upward comb-shaped drilled holes; and after all drilling construction is finished, sealing the holes, connecting a gas extraction pipeline and extracting gas. The method is used for extracting gas in a protective seam mining technology, and has the characteristic of one hole and multiple purposes; the gas of a protected seam can be pre-extracted before the protective seam is mined; after the protective seam is mined, the extraction of pressure-relief gas of the protected seam can be realized; and the construction cost is low, and a period is short.

Application Domain

Technology Topic

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  • Protected seam bottom plate upward comb-shaped drilled hole gas extraction method
  • Protected seam bottom plate upward comb-shaped drilled hole gas extraction method
  • Protected seam bottom plate upward comb-shaped drilled hole gas extraction method

Examples

  • Experimental program(1)

Example Embodiment

[0017] Such as figure 1 As shown, the comb-shaped borehole gas drainage method of the bottom plate of the protected layer of the present invention firstly arranges the drill site A in the bottom plate III of the protected layer, and first drills a main hole 1 in the drill site A along the direction of the working face. 1 The vertical distance between the horizontal position and the protected layer Ⅱ is 15-25m; after the main hole 1 is drilled 15m, stop drilling, ream the main hole 1, install the sealing pipe in the reaming hole, and install the sealing pipe The length of the hole is 8~15m; install the blowout preventer and the gas-water separator at the orifice; continue to drill the main hole 1 along the direction of the working face with near-horizontal directional drilling until the main hole 1 reaches the set depth; built into the main hole 1 Enter the packer whipstock 3 to the innermost end, and then set the position of the first strong manufacturing bevel point from the inside to the outside, and use the small diameter and large angle hole bottom motor 4 for bevel drilling to keep the drilling track to a minimum The radius extends to 0.5m through the protected layer II into the top plate I of the protected layer, completing the first branch hole 2; exit the hole bottom motor 4 from the first branch hole 2, and move the packer whipstock 3 outward to At the next strong manufacturing oblique point position, the next branch hole 2 is drilled by the hole bottom motor 4, and the drilling of all the branch holes 2 with the strong manufacturing oblique point position is completed from the inside to the outside, and finally a set is formed The multi-branch comb-shaped boreholes distributed in the bottom plate III of the protected layer, the spacing between the multi-branch comb-shaped boreholes is 20-30m; the negative pressure for gas drainage of the multi-branch comb-shaped borehole is 25-40kPa; Install a gas drainage pipeline at the orifice of the main hole 1.
[0018] Repeat the above steps to complete multiple sets of multi-branch comb drill holes distributed in the bottom plate III of the protected layer within the scope of the protected layer II, and install gas drainage pipelines at the orifices of the main holes 1 of each group. A group of multi-branch comb-shaped boreholes distributed in the bottom plate III of the protected layer are formed for gas drainage.
[0019] This method can pre-drain the gas in the protected layer before the mining of the protective layer. As the mining face advances during the mining of the protective layer, the protected layer will loosen and produce pressure relief and permeability enhancement effects, and a large amount of pressure will be relieved under the action of negative pressure in drainage The gas enters the comb borehole and is pumped out through the drainage pipeline.
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PUM

PropertyMeasurementUnit
Length8.0 ~ 15.0m
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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