Method for mining coal and gas by hydraulic jet grouting washout

A hydraulic and coalbed methane technology, applied in drilling equipment and methods, mining fluids, mining equipment, etc., can solve problems such as economic loss, casualties, environmental impact, etc., achieve cost savings, suppress dust flying, and improve underground operating environment. Effect

Inactive Publication Date: 2012-06-27
ZHENGZHOU UNIV
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Problems solved by technology

The amount of coalbed methane drained in the mine every year is about 1 billion cubic meters, which will not only have a certain impact on the

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  • Method for mining coal and gas by hydraulic jet grouting washout
  • Method for mining coal and gas by hydraulic jet grouting washout

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Embodiment Construction

[0022] The following invention will combine figure 1 For further description:

[0023] If shown, the present invention is a hydrojet coal gas recovery method, comprising the following steps:

[0024] (1) Set the coalbed methane production well 1. Use a large-diameter drilling rig to excavate a large-caliber drilling well into the coal seam 10 to a predetermined depth, set up a coalbed methane production well 1 capable of water injection, drainage, and gas output, and install a casing 2 around the production well 1 to the coal seam roof 13, and the casing 2 and the coal seam roof 13 The geological layers above the coal seam 10 are fixedly connected by known methods.

[0025] (2) mechanical hole digging. After the coalbed methane production well 1 is completed, use the existing mechanical digging tool to carry out the digging operation at the bottom of the gas production well 1 corresponding to the coal seam 10, the depth is a predetermined depth, and can accommodate the corr...

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Abstract

The invention relates to a method for mining coal and gas by hydraulic jet grouting washout, which comprises the following steps that a coal bed (10) is drilled to by using a large-diameter drilling machine; a coal bed gas mining well (1) capable of injecting water, discharging the water and venting is installed; well drilling cementation is performed by using a casing pipe (2); a well sealing device (9) is additionally installed; a ground water pump (5), a coal-water separating device (7), a gas mining device (8) and a fire retardant supply device (12) are installed; a jet grouting device (3) is lowered to the position of the target coal bed (10); high-pressure jet water provided by the ground water pump (5) acts on the coal bed (10) through the jet grouting device (3) to form a pressure relief space (11); the top and bottom positions of the jet grouting device (3) and the pressure of the jet water are regulated so as to control the coal bed mined range; a coal-water mixture reaches the coal-water separating device (7) through a drainage device (6); separated water enters the ground water pump (5) through the fire retardant supply device (12); the pressure relief space formed on the coal bed is washed to continuously generate coal bed gas; and the coal bed gas is conveyed to the gas mining device (8).

Description

technical field [0001] The invention relates to a method for coal mining and gas extraction by hydraulic swirl jet scouring, and relates to a method for fire prevention, outburst prevention and dust prevention as well as effective exploitation of coal bed gas, which is suitable for complex problems such as gas outburst in high-gas and low-permeability coal reservoirs and mine fires. Background technique [0002] Coalbed methane refers to the methane (CH 4 ) as the main component, mainly adsorbed on the surface of coal matrix particles, partly free in the coal pores or dissolved in the coal seam, is an associated mineral resource of coal, is a kind of unconventional natural gas, mainly in the state of adsorption The form is self-stored in coal seams, including four parts: adsorbed gas on the surface of the matrix, free gas in coal seam cracks and partitions, dissolved gas in coal seam water, and free gas in interlayers between coal seams. This gas is a disastrous gas that ca...

Claims

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Application Information

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IPC IPC(8): E21B43/00E21B7/18E21B7/20E21B43/114E21F5/02E21F7/00
Inventor 冯立杰李耀辉王金凤翟雪琪余华杰冯奕程盛旭阳马鸿廉钟华珂何传星
Owner ZHENGZHOU UNIV
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