Experimental system for displacing and replacing methane by carbon dioxide pulse and experimental evaluation method

A carbon dioxide and experimental system technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problem of long displacement and replacement time, inability to reflect the dynamic displacement process in real time, and the inability to clarify the relationship between displacement evaluation indicators and displacement time, etc. problem, to achieve the effect of improving recovery efficiency and methane recovery, improving efficiency and methane recovery rate

Active Publication Date: 2022-04-15
CHONGQING INST OF GEOLOGY & MINERAL RESOURCES +1
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide an experimental system and an experimental evaluation method for carbon dioxide pulse flooding and replacement of methane, so as to solve the problem that existing devices for carbon dioxide displacement and replacement of methane have a long displacement time and cannot reflect the dynamic displacement process in real time, resulting in The problem that the relationship between the displacement evaluation index and the displacement time cannot be clarified

Method used

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  • Experimental system for displacing and replacing methane by carbon dioxide pulse and experimental evaluation method
  • Experimental system for displacing and replacing methane by carbon dioxide pulse and experimental evaluation method
  • Experimental system for displacing and replacing methane by carbon dioxide pulse and experimental evaluation method

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Embodiment 1

[0089] Such as figure 1 As shown, an experimental system for carbon dioxide pulse flooding to replace methane, including a gas supply system, a pulse control system, a reservoir environment simulation system, a data acquisition and processing system, and a tail gas recovery system connected in sequence;

[0090] The gas supply system provides gas sources for the reservoir environment simulation system, and the gas sources include carbon dioxide, methane and inert gases;

[0091] The pulse control system provides pulses for the gas source, so that the gas passing through the pulse control system is converted into pulse gas;

[0092] The reservoir environment simulation system is to simulate the temperature and pressure environment of different reservoirs;

[0093] The data acquisition and processing system records and analyzes the experimental data of the reservoir environment simulation system in real time;

[0094] The tail gas recovery system is to recover the tail gas fro...

Embodiment 2

[0121] An experimental evaluation method based on the experimental system of carbon dioxide pulse flooding replacement methane in embodiment 1, comprising the following steps:

[0122] S1. Set the initial conditions: install the core test piece in the core holder of the reservoir environment simulation system, turn on the constant temperature water bath device, heat it to the set temperature, and adjust the plunger pump to make the confining pressure of the core test piece reach the set pressure , turn on the data acquisition terminal, check whether each sensor and flow meter are working normally, and close all the stop valves after the setting is completed;

[0123] S2. Check the air tightness of the device: open the fourth stop valve, fifth stop valve, sixth stop valve, and seventh stop valve, open the inert gas pressure reducing valve, and pressurize the inert gas to pressure through the hydraulic pump and the third piston Slightly higher than the maximum experimental press...

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Abstract

The invention relates to an experimental system and an experimental evaluation method for replacing methane by carbon dioxide pulse displacement. The experimental system comprises a gas supply system, a pulse control system, a reservoir environment simulation system, a data acquisition and processing system and a tail gas recovery system which are connected in sequence, carbon dioxide output by the gas supply system is converted into pulse gas through the pulse control system, the pulse gas enters the reservoir environment simulation system to shorten the methane displacement time of the carbon dioxide, experimental data of the reservoir environment simulation system are recorded and analyzed in real time through the data acquisition and processing system, the dynamic displacement process is reflected in real time, and the methane displacement time is shortened. And determining the relationship between the displacement evaluation index and the displacement time. The invention further provides an experiment evaluation method which comprises the experiment system. The problems that an existing device for displacing and replacing methane through carbon dioxide is long in displacement and replacement time and cannot reflect the dynamic displacement process in real time, and consequently the relation between the displacement evaluation index and the displacement time cannot be determined are solved.

Description

technical field [0001] The invention relates to the technical field of natural gas exploitation, in particular to an experimental system and an experimental evaluation method for carbon dioxide pulse flooding and replacement of methane. Background technique [0002] As an important strategic energy source of the country, oil and gas are of great significance in the country's economic development. In recent years, unconventional natural gas, including coalbed methane and shale gas, has also developed rapidly in China. The efficient exploitation and utilization of oil and natural gas can effectively alleviate energy shortages. As a greenhouse gas, large-scale emission of carbon dioxide will cause serious environmental damage, resulting in temperature rise and sea level rise. By replacing and displacing oil and natural gas with carbon dioxide, the viscosity of oil can be effectively reduced, natural gas can be replaced, and oil and gas yield can be increased. In addition, carb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N33/00G01D21/02
CPCG01D21/02G01N30/02G01N33/00G01N33/004G01N33/24G01V99/005
Inventor 陆朝晖卢义玉周建坤潘哲君汤积仁李大华程礼军贾云中刘军周军平
Owner CHONGQING INST OF GEOLOGY & MINERAL RESOURCES
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