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6650004 
Journal Article 
Phosphonic acid for stimulating HF-sensitive reservoirs 
Bybee, K; , 
2004 
SOC PETROLEUM ENG 
RICHARDSON 
47-48 
WOS:000222338300004 
Hydrofluoric acid (HF)-sensitive reservoirs that could not be hydraulically fractured or stimulated effectively have been a challenge to the petroleum industry. Experience shows that when such formations are stimulated with conventional acid systems based on HF or hydrochloric acid (HCl), production performance declines shortly after the treatments. Treatments with an organophosphonic acid complex have been performed in seven wells including oil producers, water injectors, and gas-injection wells in the Niger delta. 
SPE/DOE 14th Symposium on Improved Oil Recovery 
Tulsa, OK