Universiti Teknologi Malaysia Institutional Repository

Scale formation due to water injection in berea sandstone cores

Merdhah, A. B. B. and Yassin, A. A. M. (2009) Scale formation due to water injection in berea sandstone cores. Journal of Applied Sciences, 9 (18). pp. 3298-3307. ISSN 1812-5654

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Official URL: http://dx.doi.org/10.3923/jas.2009.3298.3307

Abstract

This study was conducted to investigate the permeability reduction caused by deposition of calcium, strontium and barium sulfates in Berea sandstone cores from mixing of injected Malaysian sea waters (Angsi and Barton) and formation water that contained high concentration of calcium, barium and strontium ions at various temperatures (60-90°C) and differential pressures (75-100 psig). The solubility of common oil field scales formed and how their solubilities were affected by changes in salinity and temperatures (40-90°C) were also studied. The morphology and particle size of scaling crystals formed as shown by Scanning Electron Microscopy (SEM) were also presented. The results showed that a large extent of permeability damage caused by calcium, strontium and barium sulfates that deposited on the rock pore surface. The rock permeability decline indicates the influence of the concentration of calcium, barium and strontium ions. At higher temperatures, the deposition of CaSO4 and SrSO4 scales increases and the deposition of BaSO4 scale decreases, since the solubilities of CaSO4 and SrSO4 scales decreases and the solubility of BaSO4 increases with increasing temperature. The deposition of CaSO4, SrSO4 and BaSO4 scales during flow of injection waters into porous media was shown by Scanning Electron Microscopy (SEM) micrographs.

Item Type:Article
Uncontrolled Keywords:pressure, scale concentration, scale deposition, scale solubility, temperature
Subjects:Q Science > QD Chemistry
Divisions:Chemical and Natural Resources Engineering (Formerly known)
ID Code:13093
Deposited By: Liza Porijo
Deposited On:18 Jul 2011 08:00
Last Modified:18 Jul 2011 08:00

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