Partitioned drilling, cutting and alkali injection treatment construction method for soft, low-permeability and high-hydrogen-sulfide coal seam

Abstract

The invention discloses a partitioned drilling, cutting and alkali injection treatment construction method for a soft, low-permeability and high-hydrogen-sulfide coal seam. The method comprises the steps that (1), detection and area division are conducted; (2) alkali injection parameters are designed; (3) hydraulic slotting and drilling is conducted; (4) hole sealing is conducted; (5) hole drilling and alkali injecting are conducted; (6) inspecting the alkali injection effect and adjusting hydraulic slotting and drilling parameters; and (7) detecting the emission amount of hydrogen sulfide in real time in the coal mining process, measuring the concentration of hydrogen sulfide according to a hydrogen sulfide concentration detector, modifying the hydraulic slotting spacing in the step (3) according to a monitoring result, and meanwhile, adjusting the alkali injection amount and the number of drill holes to ensure that the concentration of hydrogen sulfide is lower than a safety value 6.6 ppm when coal seams in other areas are stoped. According to the method, the coal seam alkali injection amount and the treatment range are expanded by adopting a hydraulic slotting and drilling integrated technology, different hydraulic slotting arrangement modes are adopted according to areas with different hydrogen sulfide contents, so that the efficiency of treating the hydrogen sulfide in the coal seam can be greatly improved, and meanwhile, underground operating personnel and related equipment are prevented from being damaged by the hydrogen sulfide.

Description

technical field [0001] The invention belongs to the technical field of hydrogen sulfide coal seam mining, and in particular relates to a construction method for zone drilling, cutting and alkali injection treatment of soft, low permeability and high hydrogen sulfide coal seams. Background technique [0002] With the continuous mining of coal resources in my country, the cases of hydrogen sulfide gushing out of coal seams are gradually increasing, and the abnormal gushing of hydrogen sulfide in coal seams seriously threatens the safe production of mines. The hazards are mainly manifested in: 1) The adsorption amount of hydrogen sulfide gas molecules in coal is huge, about 90 times that of methane, so hydrogen sulfide gushes out in boreholes more easily; 2) hydrogen sulfide is a poisonous gas, when When its concentration reaches 100ppm, the human body will have severe poisoning symptoms, and when it reaches 700ppm, it will cause human death in a short time; There is water, an...

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Problems solved by technology

The latter two methods are relatively effective in high-permeability coal seams, but for soft and low-permeability coal seams, it is difficult to extract hydrogen sulfide gas in coal seams by using the third method. , it is difficult to inject lye into the coal seam, resulting in a small range of influence and poor control effect

5) The traditional hydraulic jet construction method is to construct the borehole first and then perform the hydraulic jet. Because the coal body around the pre-constructed drill hole is soft and the hole collapses, it is difficult to carry out the next hydraulic jet. This method is only suitable for relatively complete coal seams. , hard area

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