Method, device and simulation experiment system for simulating gas pressure propagation during process of drainage production of coal-bed gas well

Abstract

The invention relates to a method, a device and a simulation experiment system for simulating gas pressure propagation during the process of the drainage production of a coal-bed gas well. The method comprises the following steps: gas-containing coal beds at different positions are simulated by using more than two gas tanks filled with gas having set pressure; the unidirectional migration of gas between adjacent gas-containing coal beds is simulated through a manner that every two gas tanks are communicated with each other by using a pipeline with a one-way valve; and pressure difference required during the migration of free coal-bed gas in the coal beds is simulated through regulating the opening pressure difference of the one-way valve. Aiming at the problems that the gas pressure propagation is changeable and complicated during the process of the drainage production of the coal-bed gas well and the drainage production working system is difficult to reasonably establish, an experimental simulation device, with a plurality of gas tanks and one-way valves and the like, for the gas pressure propagation during the process of the drainage production of the coal-bed gas well is designed, so that the dynamic monitoring on gas pressure during the process of the drainage production of coal-bed gas is realized, and then a theoretical basis for the establishment of the drainage production working system for the coal-bed gas well is provided.

Description

technical field [0001] The invention relates to a method, a device and a simulation experiment system for simulating air pressure propagation in the coalbed gas well drainage process. Background technique [0002] The exploitation of coalbed methane wells mainly depends on the exploitation equipment of oil and natural gas wells. Although coalbed methane and natural gas are mainly methane-based energy sources, their exploitation mechanisms are fundamentally different. Coalbed methane is mainly stored in the coal seam in an adsorbed state. To collect the gas adsorbed in the coal seam, it is first necessary to convert the adsorbed gas into a free state through certain means. At present, reducing the reservoir pressure through drainage is the key The main means of gas well drainage. Natural gas mainly occurs in free state in rocks with good reservoir permeability such as sandstone and shale, and is collected mainly by the pressure of the reservoir. When the coalbed methane is ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a simulation method, device and simulation experiment system for air pressure propagation in the drainage process of coalbed methane wells, so as to solve the problem that the existing technology purely uses theoretical calculations and the effect is not good.

Aiming at the problems that the gas pressure propagation changes in the coalbed methane well drainage process are complicated and the drainage work system is difficult to formulate reasonably, the gas pressure propagation experimental simulation device for the coalbed methane well drainage process, such as multiple gas tanks and check valves, is designed to realize the coalbed methane The dynamic monitoring of gas pressure in the process of gas drainage provides a theoretical basis for the formulation of coalbed methane well drainage work system

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