Why Scale Forms in the Oil Field and Methods To Predict It

摘要: Predicting potential scaling problems can be difficult, and numerous saturation indices computer algorithms have been developed to determine if, when, where will occur. The Langelier, Stiff-Davis, the Oddo-Tomson indices, all widely used in oil field, are compared contrasted relative calcium carbonate scale. New for barium, strontium, sulfate scale formation introduced discussed, along with an updated version of index. An CaCO[sub 3] index is presented that includes correction terms fugacity effects changes solubility CO[sub 2] gas wells as function temperature, pressure, water cut, hydrocarbons present. does not require a measured pH accommodate presence weak acids, such H[sub 2]S, wake organic acids system. production methods (for gypsum, hemihydrate, anhydrite) easy use, reliable, designed field use by operator who may untrained chemistry. prediction applied any well carbonate, sulfate, strontium or barium occurs.