CO2-brine contact angle measuring method based on micro-focus X-ray CT

Abstract

The invention belongs to the technical field of scientific research on petroleum and relates to a CO2-brine contact angle measuring method based on micro-focus X-ray CT. The measuring method comprises a rock core displacement process and a micro-focus X-ray CT shooting and image post-processing process. Pore-level in-situ measurement of CO2-brine contact angles is realized with the method. The CO2-brine contact angles in different positions and in different pores of rock cores can be measured after one-time shooting, and compared with traditional methods, the method consumes less time and is smaller in measurement result error. The method is applied to actual rock cores instead of smooth and ideal materials, and effects caused by surface roughness, mineral composition, heterogeneity of pore structures and the like on the CO2-brine contact angles are considered. The method is applicable to measurement of CO2-brine balance contact angles, retreat contact angles and advance contact angles and wide in measurement range. Measurement results are directly used as input parameters for numerical simulation and can be popularized to contact angle measurement of any gas-liquid-solid or liquid-liquid-solid three-phase systems.

Description

technical field [0001] The invention belongs to the technical field of petroleum scientific research and relates to a CO2 based on micro-focus X-ray CT. 2 - Salt water contact angle measurement method. Background technique [0002] With the continuous development of industrial production and human activities, the greenhouse effect has seriously threatened the earth's environment. The increasingly prominent environmental problems have become a challenge that the development of human society must face, and actively take measures to reduce CO 2 Emissions of the looming, CO 2 Geological storage technology has attracted attention due to its huge storage capacity and high feasibility. The multiphase flow in porous media is the main content of its research. Capillary force and relative permeability are the main indicators to characterize multiphase flow in porous media. macro parameters, while CO 2 -Salt water contact angle is an important parameter affecting capillary force an...

AI Technical Summary

Problems solved by technology

[0003] Traditional CO 2 -Most of the salt water contact angle measurement methods use the dynamic sessile drop method for measurement, but it has the following disadvantages: first, even in a simple measurement system, the measurement results are scarce and inconsistent; second, the measured CO 2 -The contact angle of brine is a fixed value, which is not consistent with the actual situation; third, due to the use of ideal smooth test materials, the influence of surface roughness, mineral composition and pore structure heterogeneity on CO 2 -The influence of salt water contact angle; Fourth, a test can only be carried out once CO 2 -Measurement of contact angle of salt water has large errors, and the test system has high requirements for test materials and reactors

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