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Estimating pH levels in Oil & Gas Production Fluids, how?

Estimating pH levels in Oil & Gas Production Fluids, how?

Estimating pH levels in Oil & Gas Production Fluids, how?

(OP)
Good day gentlemen.

I have a question regarding estimation of pH levels for process fluids in oil and gas production facilities, so this question mostly goes out to the oil and gas engineers amongst you.

During the last couple of years I have become increasingly involved with material selection for offshore oil and gas facilities in the North Sea area and as a part of this a lot of corrosion assessments are necessarily involved. As I've found this work really enjoyable I have decided to dedicate myself to learning this field more in-depth and hopefully over time become a somewhat competent corrosion engineer.

Now during the last couple of years one issue has continually popped up and for all my reading and asking questions to my process department, no one seems to have a good answer.

"How do you estimate the pH level of a production fluid based on PVT data and Formation Water Composition?"

More specifically:

How do you calculate the H+ concentration of a mixed fluid containing formation water and hydrocarbons in both liquid and vapor form?

So far I have used the graphs from ISO 15156 and the formulas from the C. de Waard papers from back in the 90's but these doesn't account for bicarbonate content or organic acids, and in all honesty I'd simply feel better if I had a better understanding about one of the most important factors involved in determining the severity of corrosive environments.

Any input you can give me will be much appreciated
 

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