Intelligent gas extraction system and method based on double-layer directional long drill hole

Abstract

The invention discloses an intelligent gas extraction system and method based on a double-layer directional long drill hole. The system comprises a coal mine information collection module, a directional drilling design module and a directional drilling module, wherein the coal mine information collection module is used for obtaining the spatial positioning of a fracture in the vertical direction of an underground coal seam of a coal mine and a mining engineering plan; the directional drilling design module is used for arranging a directional drilling track, a drilling layer, a drilling point and a measurement position based on the spatial positioning of the fracture in the coal seam and the mining engineering plan; and the directional drilling module is used for directional drilling, recording drilling data and analyzing the drilling effect, and comprises a drilling tool for drilling and a monitoring tool for monitoring the drilling data. According to the method, the long drilling technology is adopted, the single-hole forming distance is long, the effective extraction distance is long, the proportion is high, the drilling track is controllable, the measurement while drilling technology and the hole bottom spiral drilling tool are adopted for achieving manual controlled orientation to arrange the drilled holes in a key layer, bypassing construction can be conducted after the drilling encounters an unstable rock stratum, the damage degree of a gas extraction channel after hole forming is reduced, and the extraction effect is stable.

Description

technical field [0001] The invention relates to the field of directional drilling, in particular to an intelligent gas drainage system and method based on double-layer directional long drilling. Background technique [0002] With the increase of mine mining depth and the improvement of mechanization, the amount of gas emission continues to increase, especially in high-yield, high-efficiency and high-gas working faces such as fully mechanized top coal caving. Due to the limitation of ventilation capacity and wind speed, it is difficult to reduce the gas gushing from the working face to below the safe value by ventilation alone. Gas drainage is an effective means to prevent and control gas disasters. In recent years, many bureau mines have adopted comprehensive gas drainage technology, which has increased the amount of gas drainage, improved the rate of gas drainage, and prevented or reduced the occurrence of gas accidents. However, when comprehensive gas drainage technology ...

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Problems solved by technology

However, when comprehensive gas drainage technology is adopted, it is often necessary to arrange special rock gas drainage lanes, which undoubtedly increases the cost of drainage, and some high-gas working faces do not have gas drainage lanes, so comprehensive drainage technology cannot be implemented

In addition, the existing comprehensive drainage methods mostly use dense short boreholes for gas drainage, the number of boreholes is large and the effective use of boreholes is less, and the procedures and materials such as drilling rig movement, hole sealing, and pipeline layout are relatively large. , The construction time is longer and the cost is higher

[0003] In the existing technology, the common methods of gas control in gobs include special roadway drainage and ordinary high-level drilling method, such as: developing high-level drainage roadways, special tail roadways, etc., but the cost of excavation is high, it cannot be reused, and it increases Coal mining cost; for the well-developed cracks on the roof of the coal seam, ordinary drilling is used to control, and the drilling is arranged in the return airway and along the direction of the coal seam to the range of the roof cracks, which has the advantages of less investment, strong pertinence, and relatively simple operation, but There are deficiencies such as short drilling depth, large engineering volume, uncontrollable trajectory, short drainage time, and poor positioning, which restrict the efficiency of gas drainage and affect the drainage effect

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