Gas-liquid-solid three-phase jet flow anti-reflection device and anti-reflection method for soluble gas
A soluble, gas-liquid-solid technology, used in safety devices, mining fluids, earthwork drilling, etc., can solve the problems of unstable pulse state, poor stability of gas filling effect, unstable two-phase jet flow state, etc. Erosion, safety-enhancing effect
Active Publication Date: 2021-01-26
CHINA UNIV OF MINING & TECH
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Problems solved by technology
However, the experiment found that after the gas-liquid mixer is filled with gas, the flow state of the two-phase jet is unstable, showing an unstable pulse state, and the gas-filling effect sometimes has poor stability, and the gas-filling effect needs to be improved
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[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0022] Such as figure 1 As shown, a gas-liquid-solid three-phase jet anti-reflection device for soluble gas, including high-pressure water pump 1, tee 3, abrasive liquid pool 7, mud pump 6, high-pressure gas source 8, Venturi mixer I4-1, Venturi Li mixer II 4-2, static mixer 9, pressure reducing valve 10, three-way valve 11, water braid 12, drilling rig 13, drill pipe 14, pressure control drill bit 15, overflow valve 16, drill pipe 14 installed on the drilling rig 13 Above, the water braid 12 is installed on the end of the drill rod 14, and the pressure control drill bit 15 is installed on the head of the drill rod 14.
[0023] Wherein, the outlet of the high-pressure water pump 1 is connected to the inlet of the pressure regulating valve I2-1 and the tee 3 through the high-pressure rubber hose, and the outlet on one side of the tee ...
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The invention discloses a gas-liquid-solid three-phase jet flow anti-reflection device and anti-reflection method for soluble gas. The method comprises the steps that firstly, a venturi mixer I is used for mixing high-pressure water generated by a high-pressure water pump with abrasive slurry output by a slurry pump to form high-pressure liquid-solid two-phase flow; the soluble gas in a high-pressure gas source is mixed with the high-pressure liquid-solid two-phase flow by using a venturi mixer II to form gas-liquid-solid three-phase flow; the gas-liquid-solid three-phase flow is further mixedthrough a static mixer; and finally, the flow is sprayed out from a side nozzle of a pressure-controlled drill bit to perform punching or slotting operation on a coal body around a drill hole so as to improve the gas permeability of a coal seam. By adding the static mixer and introducing the soluble gas, the flow state stability of jet flow is improved, the cavitation erosion and erosion effectsduring the jet flow are improved, and the coal breaking pressure is reduced; and in addition, after hydraulic measures are finished, a large number of abrasives are left in coal seam cracks, crack closing is prevented, and the coal seam permeability is further improved.
Description
technical field [0001] The invention relates to the technical field of coal mining, in particular to a gas-liquid-solid three-phase jet anti-reflection device and an anti-reflection method for soluble gas. Background technique [0002] my country's resource endowment has the characteristics of "rich coal, poor oil, and little gas", which has led to coal accounting for 70% of my country's primary energy consumption. With the depletion of shallow resources, the mining depth of my country's mines shifts to the deep at a rate of 10-20m per year. With the increase of mining depth, the coal seam presents the characteristics of high gas pressure, strong adsorption, and low permeability, which leads to the failure of conventional gas control measures and increases the risk of coal seam outburst. [0003] In order to improve the permeability of coal seams and strengthen gas drainage, water jet technology has been widely promoted in my country. This technology uses the water hammer ...
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IPC IPC(8): E21F7/00E21B43/114E21B43/267
CPCE21B43/114E21B43/267E21F7/00
Inventor 林柏泉林明华梁德郎曹轩张连军
Owner CHINA UNIV OF MINING & TECH