Coal mine two-end gas plug and middle water seal layer penetrating drill hole sealing device and method

Abstract

A coal mine two-end gas plug and middle water seal layer penetrating drill hole sealing device comprises a gas extraction pipe, a gas injection pipe and a water injection pipe which are arranged in parallel.A first limiting block, a first expansion gas bag, a second limiting block, a third limiting block, a second expansion gas bag and a fourth limiting block are sequentially arranged on the gas extraction pipe from inside to outside, an inner end opening of the gas injection pipe is communicated with the interior of the first expansion gas bag, a gas injection hole communicated with the interior of the second expansion gas bag is formed in the gas injection pipe, and an inner end opening of the water injection pipe is located between the second limiting block and the third limiting block.The invention further discloses a hole sealing method.Cheap water and air are adopted as hole sealing materials in the device and the method and can be supplemented through an underground air compression system and a water supply system as needed to ensure good hole sealing quality, the whole device can be recycled and reused after the extraction work is finished, pollution to a coal body, underground water and underground air can be avoided, the safety level of a mine is improved, and popularization of the novel coal mine gas treatment technology can be easily promoted.

Description

technical field [0001] The invention belongs to the fields of coal mine gas disaster prevention and gas utilization, and in particular relates to a coal mine gas plug at both ends and a water seal in the middle for drilling and sealing devices and a hole sealing method. Background technique [0002] High gas mine is the inevitable trend of the development of many coal mines. With the increase of mining depth, the original gas content of the coal seam gradually increases, and with the acceleration of the mining operation, the amount of gas emission also increases. The gas problem at the working face is still the primary problem that threatens the normal safety of mine production. Gas drainage is the root cause of mine gas control, and the drilling and sealing of drainage holes is one of the most basic tasks of coal mine gas drainage. However, due to the complex geological conditions underground and the limitation of the current technical level, drilling Poor hole sealing qua...

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Problems solved by technology

[0003] For this reason, a variety of sealing methods and equipment have been researched and developed at home and abroad. A large number of experiments have shown that: due to their inherent defects and the creep effect of coal and rock mass, solid sealing materials such as cement mortar are difficult to effectively seal. Block the crack channels around the drill hole; the sealing device such as polyurethane material has poor compression resistance, which is easy to cause the failure of the drill hole air leakage, and the cost is high

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