High-gas tight coal seam pumping and injection integrated system and method
A technology of gas drainage and coal seam water injection, which is applied in the direction of gas discharge, mining fluid, earthwork drilling, etc., can solve the problems of low water injection efficiency in gas coal seams, and achieve the effects of increasing injectability, safety, and good water injection direction
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Embodiment 1
[0048] see figure 1 and figure 2 , an integrated pumping and injection system for high gassy tight coal seams, including water injection components, microwave heating components, gas extraction components and nitrogen injection components; wherein,
[0049] The water injection assembly is connected with the water injection borehole 1 on the coal seam in the coal seam roadway, and is used for injecting water into the coal seam; The surrounding coal seam is heated by microwave irradiation, and the gas drainage component is connected with the fracturing pilot borehole 2 for gas drainage of the coal seam around the fracturing pilot borehole 2; the nitrogen injection component is connected with the fracturing pilot borehole 2 Connection, used to feed liquid nitrogen into the heated coal seam, the water injection borehole 1 and the fracturing pilot borehole 2 are alternately arranged along the extension direction of the coal seam roadway, and the water injection borehole 1 is loca...
Embodiment 2
[0058] The difference from Example 1 is that the integrated pumping and injection system for high gassy and tight coal seams in this embodiment includes a water injection pump 12 and a water injection pipe 13; one end of the water injection pipe 13 is connected to the water injection pump 12, and the other end passes through the water injection borehole The hole sealing device 14 communicates with the water injection borehole 1, the water injection pump 12 is connected to the water storage tank 15, a sodium chloride solution injector 16 is provided on the nitrogen injection pipe 10, a pressure gauge 17 and a water valve 18 are provided on the water injection pipe 13, The water injection borehole 1 is blocked by a water injection borehole sealer 14 .
[0059] In this embodiment, before heating by microwave irradiation, sodium chloride solution is injected into the coal seam around the fracturing guide borehole 2 through the injection pump of the sodium chloride solution injector...
Embodiment 3
[0062] see image 3 , the difference from Example 2 is that the high-gas tight coal seam pumping and injection integrated system in this example is provided with a device for controlling the nitrogen injection pipe 10, the extraction pipe 7 on and off, and the start-up of the microwave components in the fracturing pilot borehole 2. The multi-phase switch 19, the multi-phase switch 19 includes a sleeve 1901 with a closed top and an open bottom, and the sleeve 1901 separates a first chamber 1903 at the upper part and a second chamber 1904 at the lower part independently of each other through a partition, Nozzles 1905 are provided on the outer wall of the second chamber 1904, the nitrogen injection pipe 10 and the extraction pipe 7 communicate with the first chamber 1903, and the nitrogen injection pipe 10 and the extraction pipe 7 are connected to the first chamber 1903 through the collecting pipe 20 In communication, a passage 1906 connecting the first chamber 1903 and the seco...
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