A Test Simulator for CO2 Injection to Enhance Coalbed Methane Recovery

Abstract

The invention discloses a test simulating device for improving a recovery rate of coal bed methane by injecting carbon dioxide. The test simulating device for improving the recovery rate of the coal bed methane by injecting the carbon dioxide comprises a coal reservoir simulating system, a gas injecting system, a fracture simulating carbon dioxide injecting system, a carbon dioxide absorbing device and a data collection and control system, wherein the coal reservoir simulating system is used for simulating the conditions of pressure and temperature of a coal reservoir, the gas injecting system is used for injecting methane gas or helium gas into the coal reservoir simulating system, the fracture simulating carbon dioxide injecting system is used for injecting high-pressure liquid into the coal reservoir simulating system, enabling the coal reservoir simulating system to simulate the degree of development of fractures, and injecting the carbon dioxide into the coal reservoir simulating system, the carbon dioxide absorbing device is used for absorbing the carbon dioxide exhausted by the coal reservoir simulating system, and the data collection and control system is used for collecting data and carrying out process control. The test simulating device for improving the recovery rate of the coal bed methane by injecting the carbon dioxide is capable of simulating the real conditions of the coal reservoir, simulating on-spot fracturing and the process of pump injection of the carbon dioxide, simulating effects of improvement of the recovery rate of the coal bed methane by injecting different volumes of the carbon dioxide according to different degrees of the development of the fractures and different conditions of the coal reservoir, and achieving an optimal carbon dioxide injection volume aiming at a specific coal reservoir.

Description

technical field [0001] The invention relates to the technical field of coal bed methane exploitation, in particular to a test simulation device for improving the utilization rate of coal bed methane. Background technique [0002] Coalbed methane, as a new type of clean energy, has attracted widespread attention. Coalbed methane is mainly stored in coal seams. The characteristics of low permeability of coal reservoirs in my country determine that the development of coalbed methane needs to be enhanced. Hydraulic fracturing is one of the main methods of coal reservoir transformation. As the burial depth of coal seams increases, it is difficult to increase the production capacity of coalbed methane wells only by hydraulic fracturing technology. Under the same temperature and pressure, the adsorption capacity of coal to carbon dioxide gas is much greater than that to methane. Therefore, People began to try to increase the recovery of coalbed methane by injecting carbon dioxide ...

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Problems solved by technology

As the burial depth of coal seams increases, it is difficult to increase the production capacity of coalbed methane wells only by hydraulic fracturing technology. Under the same temperature and pressure, the adsorption capacity of coal to carbon dioxide gas is much greater than that to methane. Therefore, People began to try to increase the recovery of coalbed methane by injecting carbon dioxide gas or liquid, and some experiments were also carried out on site, but the differences in coal reservoir pressure, reservoir fracture development degree, and geological structural conditions caused the current field Carbon dioxide injection technologies are still in the exploratory stage, and what kind of reservoir is effective for carbon dioxide injection? What kind of reservoir is ineffective for carbon dioxide injection? What kind of reservoir can inject carbon dioxide better to enhance oil recovery? How much recovery can be increased? How much carbon dioxide can be injected to get the highest recovery factor? For these problems, relying on the existing technology in this field can not give a more objective evaluation

On the one hand, the blindness of the project increases the investment risk, and on the other hand, it makes it impossible for people to objectively evaluate the pros and cons of this process

On-site application and on-site promotion are greatly restricted

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