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Device and method for measuring diffusion coefficient of carbon dioxide in porous medium by applying CT (computed tomography)

A porous medium, carbon dioxide technology, applied in the field of oil extraction engineering

Inactive Publication Date: 2014-06-25
DALIAN UNIV OF TECH
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Problems solved by technology

Although indirect measurements are superior to direct measurements, there are still significant limitations

Method used

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  • Device and method for measuring diffusion coefficient of carbon dioxide in porous medium by applying CT (computed tomography)
  • Device and method for measuring diffusion coefficient of carbon dioxide in porous medium by applying CT (computed tomography)
  • Device and method for measuring diffusion coefficient of carbon dioxide in porous medium by applying CT (computed tomography)

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Embodiment Construction

[0031] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings. The examples are for further describing the present invention, not limiting the present invention.

[0032] The first step is preparation.

[0033] (1) Connect the pipeline of the entire detection system according to the diagram, and test the pressure;

[0034] (2) Fill the high-pressure vessel 2 with a porous medium filled with saturated oil, and then put the high-pressure vessel 2 filled with the saturated oil porous medium into the CT scanning device 1;

[0035] (3) Connect the pipeline again, open the second needle valve 8b, the third needle valve 8c, turn on the vacuum pump 7, stop after evacuating for 30 minutes, close the second needle valve 8b, the third needle valve 8c, open the high pressure container control The temperature device 5b controls the temperature of the high-pressure container;

[0036] (4) O...

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Abstract

The invention discloses a device and method for measuring the diffusion coefficient of gas in a porous medium by applying CT (computed tomography), and belongs to the technical field of oil production engineering. The device comprises a CT imaging system and a CO2 diffusion system, wherein the CT imaging system comprises a universal X-ray CT device and a data processing computer; the CO2 diffusion system comprises a high-pressure container, a gas injection pump, a gas bottle, a gas injection pump temperature control device, a high-pressure container temperature control device, a vacuum pump, a pressure sensor and a temperature sensor; the high-pressure container is placed in the CT device; an inlet of the high-pressure container is connected with the gas bottle through the gas injection pump. During measurement, the CT device is used for obtaining a CT image in the high-pressure container, and a signal value of the CT image is used for analyzing changes in the concentration of carbon dioxide in a saturated oil porous medium, and calculating the diffusion coefficient of carbon dioxide in the saturated oil porous medium. According to the method and the device, understanding to the diffusion rules of a gas phase and an oil phase is enhanced, and basic physical property data is provided for researches on the diffusion process of gas and liquid in the porous medium.

Description

technical field [0001] The invention relates to a device and method for measuring the diffusion coefficient of carbon dioxide in a porous medium by using CT, and belongs to the technical field of petroleum exploitation engineering. Background technique [0002] Since the 1980s, a large number of experiments have proved that carbon dioxide is an effective oil displacement agent. CO 2 It has great application potential in my country's oil exploitation. in CO 2 -In the EOR (enhanced oil recovery) project, it is necessary to determine the dissolution rate of the injected gas in the oil according to the gas diffusion coefficient; 2 In the process of geological storage, the determination of diffusion coefficient is necessary data for engineering design, risk assessment, economic evaluation and performance prediction. Therefore for CO 2 It is very important to study the diffusion process in porous media. [0003] The methods for measuring diffusion coefficient mainly include ...

Claims

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Application Information

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IPC IPC(8): G01N13/00
Inventor 刘瑜汤凌越宋永臣蒋兰兰赵越超赵佳飞吕鹏飞刘树阳
Owner DALIAN UNIV OF TECH
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