Underground progressive gas pre-extraction and directional hole drilling system and method for broken and soft coal seam

A soft coal seam, directional hole technology, applied in directional drilling, gas discharge, drill pipe, etc., can solve the problems of large drilling engineering volume and long construction period gas extraction time to meet the standard, so as to increase the depth of the hole and reduce the period of reaching the standard. Effect

Active Publication Date: 2016-09-28
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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  • Abstract
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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 lon...

Method used

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  • Underground progressive gas pre-extraction and directional hole drilling system and method for broken and soft coal seam
  • Underground progressive gas pre-extraction and directional hole drilling system and method for broken and soft coal seam
  • Underground progressive gas pre-extraction and directional hole drilling system and method for broken and 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 an underground progressive gas pre-extraction and directional hole drilling system and method for a broken and soft coal seam. An orifice bubble filling system is utilized to provide a continuous bubble flow for a drill hole to drive hole bottom grooving air screw motor to perform rapid drilling, and scouring to the hole wall of the broken and soft coal seam is reduced. A triquetrum auger stem is used for strengthening residue discharge. An orifice bubble-eliminating extraction system is utilized to eliminate bubbles, remove rock cuttings and perform gas extraction, and construction safety is guaranteed. A dual-drive compound directional drilling technology is combined to regulate and control a drilling trajectory and ensure that the drill hole extends along the designed trajectory and penetrates through and covers an unmined working face and a roadway to be excavated. The hole forming depth, the hole forming precision, hole forming efficiency and hole forming rate of the broken and soft coal seam with the Platts hardness coefficient f greater than or equal to 0.5 but smaller than or equal to 0.8 are wholly improved, the formed hole is used for progressive gas pre-extraction in a broken and soft coal seam zone, and a standard-reaching period of the working face of the broken and soft coal seam and coal roadway driving gas extraction is shortened.

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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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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