New correlation for iron sulfide stability in crude oil desalting plants wastewaters

A common problem, which is critical to deep disposal of wastewaters, is deposition of scale in the pipelines, in the tubing, in the disposal well's perforations and in the receiving formation. Such deposition is attributed to incompatibility of the wastewaters being mixed or of mixture's interaction with the formation's rock and connate water. A generally good practice prior to injection is to do laboratory experiments to test the compatibility of these wastewaters. However, experience shows that compatibility tests do not reliably give an accurate indication of precipitation. Here, we show how to develop relevant correlations, which are useful for predicting precipitation of ions from such mixtures and then provide a practical example, which is for disposing different wastewaters collected from southwest Iranian desalting plants.