Development and evaluation of an acid emulsion system for the removal of paraffin containing CaCO3 deposits in oil production systems
DOI:
https://doi.org/10.62239/jca.2026.045Keywords:
Acid emulsion, CaCO3 scale, paraffin deposition, scale dissolution, oil and gas production systemAbstract
This study develops and evaluates a W/O acid emulsion system for treating CaCO3 paraffin mixed scale in oil and gas production systems. Scale samples were characterized by SEM, EDX, and XRD analyses, revealing a complex structure containing inorganic and organic components, with CaCO3 content of 30.33%, organic/paraffin fraction (LOI) of 54.19%, and an average crystal size of 5.60 nm. The scaling tendency of produced water was assessed using Langelier Saturation Index (LSI = 0.38) and Ryznar Stability Index (RSI = 6.2).
Two acid emulsion systems, HC30 and VC35, were successfully prepared and evaluated. Both systems exhibited suitable emulsification and phase separation behavior at 70°C. Among them, HC30 showed superior scale removal performance, achieving 96.25% dissolution efficiency after 4 h, compared with 88.88% for VC35. The corrosion rate of the selected system was 1.0049-1.0507 mm/year, below the acceptable limit of 2 mm/year. The HC30 system demonstrates high potential for CaCO3 paraffin scale treatment in Vietnamese oil and gas production wells.
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Copyright (c) 2026 Nghia Nguyen Trong, Nguyen Anh Tuan, Tran Viet Hoang, Dao Quoc Tuy
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