Outburst coal seam 'five-fixation' gas treatment method based on directional drilling machine

Abstract

The invention provides an outburst coal seam 'five-fixation' gas treatment method based on a directional drilling machine. The outburst coal seam 'five-fixation' gas treatment method based on the directional drilling machine comprises the following steps of (1) evaluating the feasibility of each extraction geological unit adopting the'five-fixation' gas treatment method; (2) directionally drillingeach extraction geological unit; (3) carrying out positioning disturbance in permeability improvement holes, and improving the permeability of a coal bed; (4) sealing the permeability improvement holes and extraction holes; and (5) sampling fixed points in a sealing way for determining gas parameters, quickly extracting gases conveniently, monitoring the gas concentration and the flow on an extraction pipeline in real time through a gas extraction online monitoring system, and furthermore, carrying out real-time statistic and display on the gas extraction amount and the gas amount to be extracted on a displayer through a cloud chart form through system calculation, so that the extraction time of drilling can be accurately controlled, the gas extraction amount and the participated gas content of each drill hole or hole group are displayed with a cloud chart in different colors, and an extraction effect is intuitively reflected.

Description

technical field [0001] The invention relates to the technical field of gas drainage in the coal mining process, in particular to a "five-fixed" gas control method for outburst coal seams based on a directional drilling machine. Background technique [0002] Coal seam gas has been encouraged to be developed and utilized as a clean energy because of its clean and pollution-free characteristics after combustion. However, for coal mine production, gas is a major hazard that threatens safe production. How to prevent gas accidents and realize gas safety Development and utilization is a subject that mining technicians have been exploring. [0003] Since most of the coal mines in our country are outburst mines, in order to prevent gas accidents, most local coal supervision departments require that the coal seam bottom slate lanes must be excavated in advance before mining in outburst mines, and a large number of high-density layer-penetrating drills shall be constructed in the botto...

AI Technical Summary

Problems solved by technology

[0009] Coal seam gas content test is not accurate

There are many methods for measuring the gas content of coal seams. The most commonly used methods are the hole powder method and the coring method. Put the cuttings into the coal sample tank and seal them. After being desorbed on site, send them to the laboratory for gas content testing. When the drilling is too deep (for example, greater than 60m), a large amount of gas will be left due to the drilling cuttings being discharged during the drilling process. , resulting in a large error in the calculated gas content, which cannot truly reflect the gas existing in the coal seam

The coring method refers to lowering the sampler into the borehole, and loading the coal sample into the corer through the cooperation of the coring barrel on the sampler and the drill bit, but the general sampler is an open type. During the process of lowering into the sampler, the core barrel is filled with slag on the hole wall, which affects the coring effect; after the coring is completed, the coal sample is in an exposed state during the drilling back process, and the exposure time for the deep hole sampling coal sample is long. The large amount of gas loss affects the accuracy of the measurement results

[0010] The gas evaluation of the coal seam in the area is to measure the gas content of individual points in the evaluation area, and finally evaluate the gas content of the coal seam in the area based on the gas content of each point. When the gas content of the measurement point meets the requirements, it represents the whole The pre-drainage of the area reaches the standard. This evaluation method adopts the method of replacing the area with points. Due to factors such as blank areas of drainage and inaccurate measurement of coal seam gas content may be left during the drainage process, the result is that in the area where the evaluation of drainage reaches the standard Gas accidents may also occur during excavation and mining

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