Coal-bed gas well shaft drainage gas recovery visual simulation experiment device and simulation method

Abstract

The invention discloses a coal-bed gas well shaft drainage gas recovery visual simulation experiment device which comprises a shaft simulation device and a moveable bracket, wherein an upper connector and a lower connector with release valves are respectively arranged at two ends of the shaft simulation device; the upper connector is connected with a first one-way valve, a liquid injection valve, a liquid injection flowmeter and a water pump in sequence; the lower connector is connected with a fluid meter and a draining valve in sequence; the lower connector is connected with a second one-way valve, a main gas injection valve, a gas-liquid separator, a large flow valve, a vortex shedding flowmeter, a pressure gauge, a pressure adjusting valve , a gas storage tank valve, a gas storage tank and an air compressor in sequence; the gas-liquid separator is in secondary connection with the pressure gauge through a parallel connected pipeline; a rotor flowmeter and a small flow valve are arranged in sequence on the parallel connected pipeline; the shaft simulation device comprises a transparent pressure-resistant glass tube and a multi-section type central tube. The invention further provides a coal-bed gas well shaft drainage gas recovery visual simulation method. By adopting the coal-bed gas well shaft drainage gas recovery visual simulation experiment device and the coal-bed gas well shaft drainage gas recovery visual simulation method, the flowing state of multi-phase flow inside a coal-bed gas well in any shaft deflection and deflection stabilizing section can be simulated.

Description

technical field [0001] The invention relates to a simulation device, in particular to a visual simulation experiment device and a simulation method for drainage and gas recovery in a shaft of a coalbed methane well. Background technique [0002] As a clean and environmentally friendly energy, coalbed methane is an important strategic supplement to conventional natural gas, and has important strategic significance for the country to ease the pressure of emission reduction, optimize the energy structure, and realize economic transformation. The main method of obtaining it is ground drilling and mining, using artificial boreholes to pump the groundwater in the coal seam and its surrounding rocks, thereby reducing the pressure of the coal reservoir, promoting the desorption and release of the methane gas adsorbed in the coal seam, and transporting through the oil casing annulus to the wellhead to be collected. Due to the stress sensitivity of the coal reservoir, it is necessary...

AI Technical Summary

Problems solved by technology

However, the functions of these simulation experimental devices are relatively simple, and they have not unified visualization, high pressure resistance, comprehensive control of temperature, pressure, well deviation, gas volume, and liquid volume, and the adaptability of the device to coal powder solid phase particles. Accurately simulate the flow characteristics of fluid in the wellbore of coalbed methane wells

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