Downhole progressive gas pre-extraction directional hole drilling system and method in broken soft coal seam

A soft coal seam and directional hole technology, applied in directional drilling, gas discharge, drill pipe, etc., can solve the problems of large drilling engineering volume and long time for gas drainage to reach the standard during the construction period, so as to improve the hole forming depth and reduce the standard cycle Effect

Active Publication Date: 2017-11-10
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention mainly solves the technical problems existing in the prior art such as large amount of drilling engineering, long construction period and long time for gas drainage to reach the standard, and provides an underground progressive gas pre-extraction directional hole drilling system and method for broken soft coal seams

Method used

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  • Downhole progressive gas pre-extraction directional hole drilling system and method in broken soft coal seam
  • Downhole progressive gas pre-extraction directional hole drilling system and method in broken soft coal seam
  • Downhole progressive gas pre-extraction directional hole drilling system and method in broken soft coal seam

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Embodiment

[0037] see figure 1 According to the present invention, the underground progressive gas pre-pumping directional hole drilling method in broken soft coal seams comprises the following working steps:

[0038] Step 1: Drill site 1 layout. The drilling site 1 is arranged in the coal mining roadway 2, close to the side of the working face 3 to be mined, and the distance between the drilling sites 1 is 30-50m;

[0039] Step 2: Orientation hole 4 design. The directional hole 4 is perpendicular to the coal mining roadway 2, the opening point is located in the drilling site 1, and the stabilizing hole sections are arranged in parallel at intervals of 5m; The displacement fluctuates with the ups and downs of the broken and soft coal seam 6, the length of the directional hole 4 ≥ the width of the working face 3 to be mined + the width of the coal roadway 5 to be excavated + the lead distance; the inclination and azimuth of the trajectory design of the directional hole 4 every 3m from t...

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Abstract

The invention relates to a downhole progressive gas pre-extraction directional hole drilling system and method in broken and soft coal seams. The invention utilizes the orifice foam infusion system to provide continuous foam flow to the borehole to drive the grooved air screw motor at the bottom of the hole to drill rapidly, thereby reducing the scouring of the hole wall of the crushed soft coal seam; using a triangular auger drill pipe to enhance slag discharge; using the orifice The defoaming extraction system eliminates foam, removes cuttings, and conducts gas extraction to ensure construction safety; combined with dual-drive composite directional drilling technology, the drilling trajectory is adjusted to ensure that the drilling extends along the designed trajectory and penetrates to cover the unmined working face and The roadway to be excavated; the pore-forming depth, pore-forming precision, pore-forming efficiency and porosity of the crushed-soft coal seam with a Platts hardness coefficient of 0.5≤f≤0.8 are improved as a whole, and the pore-forming is used for progressive gas in the crushed-soft coal seam area Pre-drainage reduces the period of gas drainage up to the standard in crushed soft coal seam working face and coal roadway excavation.

Description

technical field [0001] The invention relates to a drilling system and method, belonging to the field of coal mining, in particular to an underground progressive gas pre-extraction directional hole drilling system and method in broken soft coal seams. Background technique [0002] Gas is an important accident hazard in the safe and efficient mining of coal mines. In order to ensure the safety of coal mining in the later stage, pre-drainage of coal seam gas must be carried out in advance. The efficiency of gas drainage seriously affects the efficiency of coal seam mining. [0003] The pre-drainage of coal seam gas includes two important aspects: one is to cover the problem of gas drainage in coal roadway excavation in advance to ensure the safety of coal roadway excavation; At present, the gas drainage technology for medium-hard coal seams has realized progressive gas drainage, that is, the directional holes are used to drain the coal seam gas in the working face to be mined a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B7/04E21B21/14E21B21/07E21B47/022E21B47/13E21B17/00E21F7/00
CPCE21B7/04E21B17/003E21B21/07E21B21/14E21B47/022E21B47/13E21F7/00
Inventor 李泉新方俊李国富刘建林殷新胜刘飞许超冀前辉
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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