Gaseous medium dynamic caving and coal powder flowback mechanism simulation experimental device and method

Abstract

The invention discloses a gaseous medium dynamic caving coal and powder flowback mechanism simulation experimental device and method. The experimental device comprises a multi-gas high-pressure gas injection child device, a main body device and a coal powder collecting child device. The main body device at least comprises a simulation drill pipe and a pressure chamber, coal samples are placed in an inner cavity of the pressure chamber, and the simulation drill pipe is arranged in the inner cavity. The multi-gas high-pressure gas injection child device is connected to the main body device through a gas injection pipeline, and the gas injection pipeline extends into the pressure chamber. The coal powder collecting child device comprises a dust collector, a coal powder collecting tank and a water collecting tank, the coal powder collecting tank is connected to the pressure chamber through a discharge pipeline, the dust collector is arranged above the coal powder collecting tank, the coalpowder collecting tank is provided with a drainage pipe, and the drainage pipe discharges water into the water collecting tank. Therefore, in order to deeply study the gaseous medium dynamic caving and coal powder flowback mechanism and optimize process parameters, the gaseous medium dynamic caving and coal powder flowback mechanism simulation experimental device and method aim at the ''double outburst'' problem in a broken and soft outbrust coal seam mining area, and a theoretical basis for the selection of a gaseous medium dynamic caving construction process and key parameters of the processis provided.

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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