Definition:
phenolphthalein alkalinity of the mud filtrate / methyl orange alkalinity end point of mud filtrate
Subject Area 1:
Production Engineering
Remarks:
Acidity is one measure of alkalinity that is indicated by pH. However, the nature and amount of other ions such as carbonate or bicarbonate can also affect mud filtrates alkalinity. For fresh water mud systems these ions can be indicative of the rheological stability of such mud systems. Concentrations of either ion can result in high, low shear rate viscosity (yield point) and high, progressive gel strengths. Three methods can be employed for the determination of carbonate and bicarbonate concentration. The very common Pf/Mf method is restricted to mud systems having a low organic content whereas the P1/P2 method or the Garrett Gas Train may be used for better, more quantitative analysis, especially in the systems with high organic content.