HF acid blends based on formation conditions eliminate precipitation problems
Journal Article
·
· Petroleum Engineer International
OSTI ID:458484
- Halliburton Energy Services, Duncan, OK (United States)
Formulating HCl-HF acid blends based on the mineralogy and temperature of a formation can increase the success of hydrofluoric acid (HF) treatments. Sodium and potassium in the structures of formation minerals can cause precipitation and matrix plugging problems during acidizing. Slight modifications of the acid blend used in the treatment can help eliminate fluosilicate precipitation. Researchers recently conducted tests to determine how acid blends react in different formations under varying temperatures. The results of the tests indicate that the minimum HCl:HF ratio in an acid blend is 6-to-1, and the optimum ratio is 9-to-1. Regular mud acid (12% HCl-3% HF) has been used successfully for years to enhance production in sandstone formations. By the 1980s, operators began to vary the concentration of HF and HCl acids to solve excessive sanding problems in sandstone. The paper discusses treatment problems, formation characteristics, alumino-silicate scaling, research results, brine compatibility, optimum treatment, and acid volume guidelines.
- OSTI ID:
- 458484
- Journal Information:
- Petroleum Engineer International, Journal Name: Petroleum Engineer International Journal Issue: 3 Vol. 70; ISSN 0164-8322; ISSN PEEID4
- Country of Publication:
- United States
- Language:
- English
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