STUDY OF CARBONATE ROCK DISSOLUTION USING X-RAY MICROCOMPUTED TOMOGRAPHY: IMPACT OF ACID FLOW RATE
Akasheva Z.K. Bolysbek D.A. Assilbekov B.K.
2023National Academy of Sciences of the Republic of Kazakhstan
News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences
2023#1Issue 45720 - 32 pp.
High-pressure high-temperature flow apparatus in combination with X-ray micro-tomography were used to study the change of pore structure during the dissolution of carbonate core samples. 8 carbonate samples (with >99% calcite) were considered. During the dissolution experiment, an HCl solution with a concentration of 12 or 18% was injected into these core samples at flow rates of 1, 2, 4 and 8 ml/min. Samples were scanned before and after the acid injection at about 19 microns. Avizo® software was used for image processing. Results show a significant increase in permeability due to dissolution, especially at high flow rates. It was shown that images with a resolution of about 19 µm are not enough to estimate overall porosity of the samples. Also, it has been shown that at this resolution the median filter is more suitable. The change of the 3D pore structure due to dissolution shows that the dissolution pattern was conical for low flow rates (1 and 2 ml/min), but for high (4 and 8 ml/min) flow rates it becomes more dominant for both 12% and 18% HCl concentration. It has been observed that the flow rate significantly impacts the sample-averaged dissolution rate. With an increase in the flow rate, the sample-averaged dissolution rate increases.
image porosity , imaging , reactive dissolution , X-Ray micro-computed tomography
Text of the article Перейти на текст статьи
Satbayev University, Almaty, Kazakhstan
Al-Farabi Kazakh National University, Almaty, Kazakhstan
Satbayev University
Al-Farabi Kazakh National University
10 лет помогаем публиковать статьи Международный издатель
Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026