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<p>The reaction between acid and crude oil during oil well acidizing results in the formation of asphaltic sludge, a protonated complex enriched with H⁺ ions that forms within oil reservoirs. Its intricate structure and limited solubility make removal challenging, distinguishing it from asphaltene precipitation. This study aims to address the research gap regarding the effectiveness of solvents in asphaltic sludge removal. Three solvents, namely xylene, tetrahydrofuran (THF), and a kerosene-diesel mixture, were tested to evaluate their dissolution efficiency compared with the solubility of different asphaltene types. The results indicated that THF and xylene were the most effective solvents, with solubility rates of 70% and 60%, respectively. In contrast, the kerosene-diesel mixture exhibited nearly 0% solubility due to the absence of aliphatic and nonpolar compounds in the sludge required for effective dissolution. Analysis of influencing parameters revealed that increasing solvent volume to 20&#xa0;mL/g improved solubility by 20%. In reservoir conditions, rock particle deposition is likely. The presence of 0.5&#xa0;g of rock powders reduced THF and xylene solubility to 30% and 39%, respectively, due to H⁺ ion deactivation. Increasing contact time to 60&#xa0;min and mixing speed to 1800 RPM further improved solubility by up to 10% and 20%, respectively.</p>

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Experimental assessment of chemical solvents for asphaltic sludge removal to mitigate formation damage in oil reservoirs

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月1日

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  • Mojtaba Javdani,
  • Sina Shakouri,
  • Maysam Mohammadzadeh-Shirazi

摘要

The reaction between acid and crude oil during oil well acidizing results in the formation of asphaltic sludge, a protonated complex enriched with H⁺ ions that forms within oil reservoirs. Its intricate structure and limited solubility make removal challenging, distinguishing it from asphaltene precipitation. This study aims to address the research gap regarding the effectiveness of solvents in asphaltic sludge removal. Three solvents, namely xylene, tetrahydrofuran (THF), and a kerosene-diesel mixture, were tested to evaluate their dissolution efficiency compared with the solubility of different asphaltene types. The results indicated that THF and xylene were the most effective solvents, with solubility rates of 70% and 60%, respectively. In contrast, the kerosene-diesel mixture exhibited nearly 0% solubility due to the absence of aliphatic and nonpolar compounds in the sludge required for effective dissolution. Analysis of influencing parameters revealed that increasing solvent volume to 20 mL/g improved solubility by 20%. In reservoir conditions, rock particle deposition is likely. The presence of 0.5 g of rock powders reduced THF and xylene solubility to 30% and 39%, respectively, due to H⁺ ion deactivation. Increasing contact time to 60 min and mixing speed to 1800 RPM further improved solubility by up to 10% and 20%, respectively.