Method for testing CO2 concentration distribution and diffusion coefficient in saturated oil porous medium

A technology of concentration distribution and porous media, which is applied in the direction of measuring devices, material separation, and analysis of materials, can solve the problems affecting the final results and the real state error of the reservoir, achieve accurate test results, eliminate the influence of sharp pressure fluctuations, and calculate convenient effect

Active Publication Date: 2017-06-20
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

But the CO of this method 2 The concentration distribution is obtained by pure calculation. The calculation of parameters such as equation of state, compression factor, and expansion coefficient in the mathematical model may have a large error with the real state of the reservoir, thus affecting the CO2 in crude oil. 2 Concentration Final Results

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  • Method for testing CO2 concentration distribution and diffusion coefficient in saturated oil porous medium
  • Method for testing CO2 concentration distribution and diffusion coefficient in saturated oil porous medium
  • Method for testing CO2 concentration distribution and diffusion coefficient in saturated oil porous medium

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Embodiment 1

[0043] A method for testing CO in saturated oil porous media 2 The method of concentration distribution and diffusion coefficient includes the following steps:

[0044] 1) CO2 was carried out on the well-saturated oil sample core 2 Axial diffusion, first pretreatment of core saturated oil:

[0045] (1-1) The core holder is cleaned and dried;

[0046] (1-2) Vacuumize the long core to maintain a pressure of 10MPa to saturate the oil.

[0047] Wherein, the core is a rectangular core with a size of 45×45×300 mm.

[0048] Secondly, the axial diffusion of CO in the core 2 The preprocessing of:

[0049] (1-3) Put the core holder into the incubator, and adjust the temperature to the required temperature of 70°C for the experiment, and stabilize for 8-10h;

[0050] (1-4) CO 2 The two ends of the core holder are connected to carry out axial diffusion of the core. During the diffusion process, the gas pressure is always kept stable at the pressure required by the experiment, prefera...

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Abstract

The invention relates to a method for testing CO2 concentration distribution and a diffusion coefficient in a saturated oil porous medium. The method comprises the following steps: utilizing a porous medium one-dimensional axial dispersion model considering oil phase expansion, and fitting CO2 actually-tested concentration distribution in the porous medium at a certain time point with the concentration distribution calculated by a mathematical model; solving the diffusion coefficient D of CO2 in the saturated oil porous medium from a relation tau=tD/x0<2> of dimensional time quantity and dimensionless time quantity. The actually-tested concentration distribution needing to be used is tested by carrying out fluid sampling, separation and gas chromatographic analysis under certain time. According to the method provided by the invention, the diffusion concentration distribution of the CO2 in the oil-containing porous medium can be directly measured under a certain time point, and errors of digital-analog concentration predication are avoided; meanwhile, the method is convenient for solving, and influences, caused by a falloff curve method, on rapid fluctuation of pressure at high temperature and high pressure, and complicated solving and correction processes are eliminated.

Description

technical field [0001] The invention relates to a method for testing CO in saturated oil porous media 2 The method for concentration distribution and diffusion coefficient belongs to the technical field of oil and gas field development engineering. Background technique [0002] CO 2 After being dissolved in crude oil, it can expand the volume of crude oil and effectively reduce the viscosity of crude oil and the interfacial tension between oil and water. It is an ideal injection fluid and can greatly increase the recovery of crude oil. Note CO 2 The development of enhanced oil recovery technology has a history of more than 50 years, and it has been widely used at present. For low-permeability and tight oil reservoirs, water injection development is more difficult, CO injection 2 Mining is an effective way to enhance oil recovery. According to the 2012 "Global EOR Survey" of "Oil and Gas Journal", among the global EOR projects, the number of gas drive projects accounted ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G06F19/00
CPCG16Z99/00G01N30/02
Inventor 李松岩乔辰宇李兆敏冀国伟李宾飞张超
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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