Evaluation of formation water chemistry and scale prediction: Bakken Shale
- ESal LLC, Laramie, WY (United States)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Determination of in situ formation water chemistry is an essential component of reservoir management. This study details the use of thermodynamic computer models to calculate reservoir pH and restore produced water analyses for prediction of scale formation. Bakken produced water samples were restored to formation conditions and calculations of scale formation performed. In situ pH is controlled by feldspar-clay equilibria. Calcite scale is readily formed due to changes in pH during pressure drop from in situ to surface conditions. The formation of anhydrite and halite scale, which has been observed, was predicted only for the most saline samples. Finally, in addition, the formation of anhydrite and/or halite may be related to the localized conditions of increased salinity as water is partitioned into the gas phase during production.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA)
- Contributing Organization:
- ESal LLC, Laramie, WY (United States)
- Grant/Contract Number:
- AC04-94AL85000
- OSTI ID:
- 1339255
- Alternate ID(s):
- OSTI ID: 1413040
OSTI ID: 22646933
- Report Number(s):
- SAND2015--9055J; PII: S0883292716304267
- Journal Information:
- Applied Geochemistry, Journal Name: Applied Geochemistry Vol. 75; ISSN 0883-2927
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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