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An observational supercritical co 2 - Methods of gas diffusion phenomena

A gas diffusion and supercritical technology, used in diffusion analysis, measurement devices, surface/boundary effects, etc., can solve the problems of system disturbance, inability to fully reflect molecular diffusion, and intuition of experimental process, and achieve weak polarity. Effect

Active Publication Date: 2020-06-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But there are following deficiencies in the above-mentioned method: 1) based on measuring gas-liquid diffusion, evaluate supercritical CO 2 - The phenomenon of gas diffusion is less; 2) The direct method requires continuous sampling to test the gas concentration, and the system is disturbed during the sampling process, which cannot fully reflect the molecular diffusion; 3) The experimental process is not intuitive enough
At present, there is a lack of an intuitive and visual observation of supercritical CO under high temperature and high pressure conditions. 2 - Methods of gas diffusion phenomena

Method used

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  • An observational supercritical co <sub>2</sub> - Methods of gas diffusion phenomena
  • An observational supercritical co <sub>2</sub> - Methods of gas diffusion phenomena

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This example is to observe the supercritical CO 2 in CH 4 Diffusion phenomenon in . use as figure 1 The experimental setup is shown. The supercritical CO used 2 The dyeing agent is Disperse Scarlet S-BWFL.

[0031] The specific experimental steps are as follows:

[0032] 1) CO 2 and CH 4 Fill respectively into the gas activity areas of the two high-temperature and high-pressure gas piston containers 4-1 and 4-2 that have been evacuated. The gas activity areas are divided into high-temperature and high-pressure gas piston containers 4-1 and 4-2 by piston One of the two independent areas, the other area is the pressure control area;

[0033] Put the dispersed scarlet S-BWFL into the gas diffusion zone of the visualization reactor 1; the gas diffusion zone is one of the two independent regions divided by the piston 1 into the visualization reactor, and the other zone is the pressure control zone;

[0034] 2) Use the vacuum pump 5 to evacuate the gas diffusion area...

Embodiment 2-4

[0038] Experiments were carried out according to the method in Example 1, except that the experimental pressures were 15MPa, 20MPa, and 25MPa, respectively.

[0039] The experimental pressures of Examples 1-4 and the recorded equilibration time are shown in Table 1.

[0040] Table 1

[0041] serial number Experimental pressure (MPa) Balance time (h) Example 1 10 77 Example 2 15 118 Example 3 20 190 Example 4 25 213

[0042] The above experimental results show that by the method of the present invention, it is possible to observe supercritical CO under high temperature and high pressure conditions. 2 - Gas diffusion. At the same time, it can be seen that the higher the pressure, the higher the supercritical CO 2 in CH 4 The slower the diffusion rate in .

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Abstract

The invention discloses a method for observing a supercritical CO2-gas diffusion phenomenon. The method comprises the following steps: 1) injecting CO2 and experimental gas A into gas active regions of two high-temperature and high-pressure gas piston containers which are vacuumized, and placing a supercritical CO2 coloring agent into a gas diffusion region of a visual reaction kettle; 2) vacuumizing the gas diffusion region of the visual reaction kettle, and heating to an experimental temperature, wherein the experimental temperature is not lower than a CO2 critical temperature; 3) injecting the CO2 in the high-temperature and high-pressure gas piston containers into the gas diffusion region of the visual reaction kettle for dyeing, and recording the CO2 state in the reaction kettle, wherein the experimental pressure is not lower than the CO2 critical pressure; 4) after the CO2 is dyed uniformly, injecting the experimental gas A in the high-temperature and high-pressure gas piston containers into the gas diffusion region of the visual reaction kettle, and observing and / or recording the state of the supercritical CO2-experimental gas A in the reaction kettle. By adopting the method, the supercritical CO2-gas diffusion phenomenon can be evaluated visually.

Description

technical field [0001] The invention relates to the field of oil and gas field development, more specifically, to a method for observing supercritical CO under high temperature and high pressure conditions. 2 - Visualization method for gas diffusion phenomena. Background technique [0002] Diffusion is a phenomenon in which a component with a concentration gradient in a system moves from a high-concentration area to a low-concentration area. Diffusion phenomena can be found in various fields such as chemical industry, building materials and food industry, and the diffusion process is complex, including many diffusion mechanisms. Carrying out the study of diffusion phenomenon is conducive to deepening the understanding of mass transfer process, which has important theoretical and industrial significance. [0003] CO at normal temperature and pressure 2 The diffusion speed among other gases is very fast, but under high temperature and pressure, due to the supercritical CO ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N13/00
CPCG01N13/00G01N2013/003
Inventor 潘伟义伦增珉吕成远赵清民贾英周霞王海涛赵春鹏郎东江卢刚
Owner CHINA PETROLEUM & CHEM CORP