SPE International Production and Operations Conference & Exhibition,
14-16 May 2012, Doha, Qatar
The Impact of TAN From Heavy Oil EOR to
Operation and Integrity: Case Study
Ardian Nengkoda, Petroleum Development Oman
Abstract
TAN (Total Acid Number) is a major issue in
heavy oil production. This is because
the value of crude oils is often dependent on the corrosivity of the oil. Corrosivity is mainly a function of the total
acid number of the oil. TAN, in turn, is heavily dependent on the naphthenic
acid concentration of the oil. As a
result, crudes having a relatively high TAN have a significantly lower market
value than crudes having a relatively lower TAN.
The current approach to refine acidic crudes is
to blend the acidic crudes with non-acidic crudes, so that the TAN of the blend
is no higher than about 0.5. Author
describes a case study conducted to predict the overall mix of crude TAN in the
main oil line to determine the impact of TAN from a heavy oil steam EOR
operation in Oman.
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