RESEARCH ARTICLE


Laboratory Study on Precipitation of Barium Sulphate in Malaysia Sandstone Cores



Amer Badr Bin Merdhah*, Abu Azam Mohd Yassin
Faculty of Chemical and Natural Resources Engineering, Universiti Teknologi Malaysia. 81310 Skudai, Johor, Malaysia.


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© 2009 Merdhah and Yassin;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Faculty of Chemical and Natural Resources Engineering, Universiti Teknologi Malaysia. 81310 Skudai, Johor, Malaysia; E-mail: amer0227@yahoo.com


Abstract

Scale formation is one of the most serious oil field problems that inflict water injection systems primarily when two incompatible waters are involved. Two waters are incompatible if they interact chemically and precipitate minerals when mixed. Due to the lack of reaction kinetics data, the rate of barium sulphate deposition in porous rock was measured through flooding sandstone core samples of uniform properties with supersaturated brine. The brine was formulated at the core inlet by mixing of injected sea water and formation water that contained high concentration of barium ion at various temperatures (50 - 80°C) and differential pressures (100 - 200 psig). The rate of BaSO4 scale formation was estimated by monitoring the core effluent’s barium ion concentration. The solubility of barium sulphate scale formed and how its solubility was affected by changes in salinity and temperatures (40 - 90°C) were also studied. Scanning Electron Microscopy analysis was also used to examine the nature of scale deposition throughout the core. The results indicated increased rate of BaSO4 precipitation at higher temperatures and greater brine super-saturation. The results were utilized to build a general reaction rate equation to predict BaSO4 deposition in sandstone cores for a given temperature, brine super-saturation and differential pressures.

Keywords: Scale deposition, scale solubility, concentration of barium ion, temperature and pressure effects.