Experimental device and method for simulating the flowback mechanism of pulverized coal in gas medium dynamic cavitation

Abstract

A device and method for simulating an experimental device and method for gas medium dynamic cavitation pulverized coal flowback mechanism. The experimental device includes a multi-gas high-pressure gas injection sub-device, a main device and a pulverized coal collection sub-device. The main device includes at least a simulated drill pipe and a pressure chamber , coal samples are placed in the inner cavity of the pressure chamber, the simulated drill pipe is arranged in the inner cavity, the multi-gas high-pressure gas injection sub-device is connected to the main device through the gas injection pipeline, and the gas injection pipeline extends into the pressure chamber, so The pulverized coal collection sub-device includes a dust collector, a pulverized coal collection pool and a sump. The pulverized coal collection pool is connected to the pressure chamber through a blowout pipeline, and a dust collector is arranged above it. The pulverized coal collection pool is provided with a drainage system. The drainage pipe discharges water into the catchment pool; thus, the present invention aims at the problem of "double outbursts" in the broken soft outburst coal seam mining area, in order to further study the gas medium dynamic cavitation, pulverized coal flowback mechanism and optimize the process parameters. It provides a theoretical basis for the gas medium dynamic cavitation construction technology and the selection of key parameters.

Description

technical field [0001] The invention relates to the technical field of coalbed methane and coal mine gas drainage experimental equipment, in particular to a simulation experiment device and method for gas medium dynamic cavitation pulverized coal flowback mechanism. Background technique [0002] Gas medium dynamic cavitation technology is a key technology for coalbed methane (gas) extraction methods such as coalbed methane open-hole cave completion and downhole drilling gas medium coal removal. It can increase the exposed area of ​​coal seams, release stress, and improve coal seam permeability. It has significant effects in improving the rate of coal seam gas production and the total amount of gas produced. At present, for the broken and soft outburst coal seams with broken and soft coal structure, high gas content, and low air permeability, conventional gas drainage drilling is less effective due to reasons such as easy hole collapse and hole blocking, and ground coal seam ...

AI Technical Summary

Problems solved by technology

However, it must be recognized that during the implementation of this technology, many key links are still in the exploratory stage, and the process parameters are still unclear

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