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Method for measuring diffusion process and diffusion coefficient of CO2 between oil-water two-phase

A diffusion coefficient and diffusion process technology, which is applied in the field of measuring the diffusion process and diffusion coefficient of CO2 between oil and water phases, can solve the problems of pressure drop curve fluctuation, complicated measurement process, and processing error, so as to avoid large fluctuations in pressure and improve calculation accuracy Effect

Active Publication Date: 2017-08-18
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

This method is only capable of experimentally determining CO 2 The pressure change during the process of diffusion from the water phase to the oil phase, but the pressure drop curve obtained by the experiment fluctuates greatly, which brings great errors to the processing of subsequent experimental results, and the measurement process is complicated

Method used

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  • Method for measuring diffusion process and diffusion coefficient of CO2 between oil-water two-phase
  • Method for measuring diffusion process and diffusion coefficient of CO2 between oil-water two-phase
  • Method for measuring diffusion process and diffusion coefficient of CO2 between oil-water two-phase

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Effect test

Embodiment 1

[0061] A predictive CO 2 Through the oil phase to the water phase diffusion process and the method of diffusion coefficient, the implementation steps are as follows:

[0062] (1) Measure the cross-sectional area of ​​the diffusion vessel to be 20cm 2 and the volume V of the diffusion vessel 1 250mL, wash and dry the diffusion vessel and vacuumize it;

[0063] (2) CO 2 Fill the diffusion vessel and increase the pressure to the test pressure of 14.60MPa, the diffusion vessel is externally connected to the back pressure, and the back pressure is equal to the test pressure;

[0064] (3) Inject 92mL of pure water at a temperature of 323.15K from the lower part of the diffusion vessel at a rate of 20mL / min. The injection process is connected to the back pressure to keep the pressure of the diffusion vessel system constant. The height of the water phase is z 0 1.3cm;

[0065] (4) After the pure water is injected, close the diffusion container, and use the pressure acquisition sy...

Embodiment 2

[0097] A measure of CO 2 The method of diffusion process and diffusion coefficient between oil and water two phases, as shown in embodiment 1, difference is:

[0098] The positions of the oil phase and the water phase in the diffusion vessel are exchanged, and the diffusion process is CO 2 The diffusion coefficient can also be measured by this method through the diffusion of the water phase to the oil phase.

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Abstract

The invention relates to a method for measuring a diffusion process and a diffusion coefficient of CO2 between oil-water two-phase. The method comprises the following steps: combining a single-liquid-phase pressure landing method with a two-liquid-phase extension concentration distribution model, determining the diffusion coefficient of the CO2 in the single-liquid-phase according to the pressure landing method, directly obtaining the concentration distributions of the CO2 in two liquid phases through the extension concentration distribution model, and then acquiring the diffusion coefficient of the CO2 in the oil-water two-phase. By use of the method disclosed by the invention, the pressure of directly measuring the CO2 diffusing to the two-liquid-phase is avoided, the computing precision of the subsequent experimental data processing is improved, and the operation is more simple; and meanwhile, the method disclosed by the invention is more in line with the diffusion feature under high temperature and high pressure, a problem of drastic fluctuation of the pressure under a condition that the two-liquid-phase diffusion pressure landing is small is avoided, and the computing result is more in line with the actual situation of the diffusion under the high temperature and the high pressure.

Description

technical field [0001] The invention relates to a method for measuring CO 2 The method of diffusion process and diffusion coefficient between oil and water two phases belongs to the technical field of oil and gas field development engineering. Background technique [0002] In recent years, the global demand for oil has grown rapidly, the objects of oil and gas exploration and development have become increasingly complex, and the quality of reserves has become worse and worse. Unconventional reservoirs such as heavy oil reservoirs and low-permeability tight reservoirs will become important targets for oil and gas development in the future. Among the many development methods of unconventional reservoirs, CO injection 2 Extraction technologies are widely used due to their cost-effectiveness and compliance with current requirements to reduce greenhouse gas emissions. [0003] Note CO 2 Mining technologies mainly include CO 2 flooding, CO 2 Throughput and CO 2 Alternate wa...

Claims

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Application Information

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IPC IPC(8): G01N13/00
CPCG01N13/00G01N2013/003
Inventor 李宾飞张启亮陈龙坤李兆敏许建国丁立苹李松岩
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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