An organic acid is an organic compound that is an acid. The most common example are the carboxylic acids whose acidity derives from a carboxyl group -COOH. Other groups can also cause a weak acidity: hydroxyl group -OH, -SH, enol group, -OSO₃H, or the phenol group. An organic acid is any of various acids containing one or more carboncontaining radicals, such as acetic or formic acid, used in oil and gas well-stimulation treatments. Inhibited organic acids are much less reactive with metals than are HCl or mixtures of HCl and HF. For this very reason, organic acids are used at high bottomhole temperatures or when long contact times between acid and pipe are needed.

Acids | Organic acids

Organische Säure | Ácido orgánico | Acizi organici | กรดอินทรีย์ | Axít hữu cơ | 有机酸