Predicted and Observed Evolution of Produced-Brine Compositions and Implications for Scale Management
- Yisheng Hu (Heriot-Watt University) | Eric Mackay (Heriot-Watt University) | Oleg Ishkov (Heriot-Watt University) | Alistair Strachan (Baker Hughes (now with Nalco Champion))
- Document ID
- Society of Petroleum Engineers
- SPE Production & Operations
- Publication Date
- August 2016
- Document Type
- Journal Paper
- 270 - 279
- 2016.Society of Petroleum Engineers
- natural tracers, reactive transport modelling, scale management, brine geochemistry
- 3 in the last 30 days
- 297 since 2007
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Produced water was sampled and measured repeatedly during production from an offshore field, and an extensive brine-chemistry data set was developed. Systematic analysis of this data set enables an in-depth study of brine/brine and brine/rock interactions occurring in the reservoir, with the objective of improving the prediction and management of scale formation, along with improving its prevention and remediation.
A study of the individual-ion trends in the produced brine by use of the plot types developed for the reacting-ions toolkit (Ishkov et al. 2009) provides insights into the components that are involved in in-situ geochemical reactions as the brines are displaced through the reservoir, and how the precipitation and dissolution of minerals and the ion-exchange reactions occurring within the reservoir can be identified. This information is then used to better evaluate the scale risk at the production wells.
A thermodynamic prediction model is used to calculate the risk of scale precipitation in a series of individual produced-water samples, thus providing an evaluation of the actual scaling risk in these samples, rather than the usual theoretical estimate, on the basis of the endpoint formation- and injection-brine compositions and the erroneous assumption that no reactions in the reservoir impact the produced-water composition. Nonetheless, the usual effects of temperature, pressure, and brine composition are accounted for in these calculations by use of classical thermodynamics. The comparison of theoretical and actual results indicates that geochemical reactions taking place in this given reservoir lead to ion depletion, which greatly reduces the severity and potential for scale formation. However, ion-exchange reactions are also observed, and these too affect the scale risk and the effectiveness of scale inhibitors in preventing deposition.
Additionally, comprehensive analysis by use of a geochemical model is conducted to predict the evolution of the produced-brine compositions at the production wells and to test the assumptions about which in-situ reactions are occurring. A good match between the predictions from this geochemical model and the observed produced-brine compositions is obtained, suggesting that the key reactions included in the geochemical model are representative of actual field behavior. This helps to establish confidence that the model can be used as a predictive tool in this field.
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Al Mayahi, N., Snippe, J., Rucci, F. et al. 2012. Water Injection Subsurface Challenges and Reactive Transport Modelling. Presented at the SPE EOR Conference at Oil and Gas West Asia, Muscat, Oman, 16–18 April. SPE-154457-MS. http://dx.doi.org/10.2118/154457-MS.
Appelo, C. A. J and Postma, D. 2010. Geochemistry, Groundwater and Pollution. Boca Raton, Florida: CRC Press.
Bybee, K. 2009. Formation Mineralogy Affects Scale-Inhibitor Squeeze Designs. J Pet Technol 61 (6): 51–53. SPE-0609-0051-JPT. http://dx.doi.org/10.2118/0609-0051-JPT.
Fu, Y., van Berk, W., and Schulz, H. M. 2012. Hydrogeochemical Modelling of Fluid-Rock Interactions Triggered by Seawater Injection into Oil Reservoirs: Case Study Miller Field (UK North Sea). Applied Geochemistry 27 (6): 1266–1277. http://dx.doi.org/10.1016/j.apgeochem.2012.03.002.
Gomes, R., Mackay, E. J., Deucher, R. H. et al. 2012. Impact of Reservoir Reactions on Thermodynamic Scale Predictions. Presented at the SPE International Conference on Oilfield Scale, Aberdeen, UK, 30–31 May. SPE-155255-MS. http://dx.doi.org/10.2118/155255-MS.
Houston, S. J., Yardley, B., Smalley, P. C. et al. 2006. Precipitation and Dissolution of Minerals During Waterflooding of a North Sea Oil Field. Presented at the SPE International Oilfield Scale Symposium, Aberdeen, UK, 30 May–1 June. SPE-100603-MS. http://dx.doi.org/10.2118/100603-MS.
Ishkov, O., Mackay, E. J., and Sorbie, K. S. 2009. Reacting Ions Method To Identify Injected Water Fraction in Produced Brine. Presented at the SPE International Symposium on Oilfield Chemistry, The Woodlands, Texas, 20–22 April. SPE-121701-MS. http://dx.doi.org/10.2118/121701-MS.
Kaasa, B. 1998. Prediction of pH, Mineral Precipitation and Multiphase Equilibria During Oil Recovery. IUK-PhD thesis, The Norwegian University of Science and Technology, Trondheim, Norway.
Mackay, E. J. 2003. Modeling of In-Situ Scale Deposition: The Impact of Reservoir and Well Geometries and Kinetic Reaction Rates. SPE Prod & Fac 18 (1): 45–56. SPE-81830-PA. http://dx.doi.org/10.2118/81830-PA.
Mackay, E. J., Jordan, M. M., and Torabi, F. 2003. Predicting Brine Mixing Deep Within the Reservoir and Its Impact on Scale Control in Marginal and Deepwater Developments. SPE Prod & Fac 18 (3): 210–220. SPE-85104-PA. http://dx.doi.org/10.2118/85104-PA.
Mackay, E. J., Matharu, A. P., Sorbie, K. S. et al. 2000. Modeling Scale-Inhibitor Treatments in Horizontal Wells: Application to the Alba Field. SPE Prod & Fac 15 (2): 107–114. SPE-63013-PA. http://dx.doi.org/10.2118/63013-PA.
Mackay, E. J. and Sorbie, K. S. 2000. Brine Mixing in Waterflooded Reservoirs and the Implications for Scale Prevention. Presented at the SPE International Symposium on Oilfield Scale, Aberdeen, UK, 26–27 January. SPE-60193-MS. http://dx.doi.org/10.2118/60193-MS.
Mackay, E. J., Sorbie, K. S., Kavle, V. et al. 2006. Impact of In-Situ Sulphate Stripping on Scale Management in the Gyda Field. Presented at the SPE International Oilfield Scale Symposium, Aberdeen, UK, 30 May–1 June. SPE-100516-MS. http://dx.doi.org/10.2118/100516-MS.
McCartney, R. A., Tjomsland, T., Sandøy, B. et al. 2012. Application of Multirate Well Tests (MRT) to Scale Management: Part 1—Interpretation of Produced-Water Analyses. SPE Prod & Oper 27 (2): 211–222. SPE-131011-PA. http://dx.doi.org/10.2118/131011-PA.
McCartney, R. A., Williams, J. C., and Coghlan, G. P. 2005. Processes Determining the Composition of Produced Water From Subsea Fields and Implications for Scale Management - Birch Field, UKCS. Presented at the SPE International Symposium on Oilfield Scale, Aberdeen, UK, 11–12 May. SPE-94869-MS. http://dx.doi.org/10.2118/94869-MS.
McCartney, R. A., Melvin, K., Wright, R. et al. 2007. Seawater Injection Into Reservoirs With Ion Exchange Properties and High Sulphate Scaling Tendencies: Modelling of Reactions and Implications for Scale Management, With Specific Application to the Gyda Field. Prepared for the 18th International Oilfield Chemistry Symposium, Geilo, Norway, 26–28 March. http://oilfieldwaterservices.co.uk/wp-content/uploads/2014/05/McCartney-et-al-2007.pdf.
Morgenthaler, L. N., Zhu, D., Mou, J. Y. et al. 2008. Effect of Reservoir Mineralogy and Texture on Acid Response in Heterogeneous Sandstones. SPE Prod & Oper 23 (1): 39–48. SPE-102672-PA. http://dx.doi.org/10.2118/102672-PA.
Østvold, T., Mackay, E. J., McCartney, R. A. et al. 2010. Re-development of Frøy Field: Selection of Injection Water. Presented at the SPE International Conference on Oilfield Scale, Aberdeen, UK, 26–27 May. SPE-130567-MS. http://dx.doi.org/10.2118/130567-MS.
Parkhurst, D. L. and Appelo, C. A. J. 1999. User’s Guide to PHREEQC (Version 2)—A Computer Program for Speciation, Batch-Reaction, One-Dimensional Transport, and Inverse Geochemical Calculations. U.S. Geological Survey, Water-Resources Investigations Report 99-4259, US Geological Survey, Denver, Colorado.
Paulo, J., Mackay, E. J., Menzies, N. A. et al. 2001. Implications of Brine Mixing in the Reservoir for Scale Management in the Alba Field. Presented at the SPE International Symposium on Oilfield Scale, Aberdeen, UK, 30–31 January. SPE-68310-MS. http://dx.doi.org/10.2118/68310-MS.
Sorbie, K. S. and Mackay, E. J. 2000. Mixing of Injected, Connate and Aquifer Brines in Waterflooding and Its Relevance to Oilfield Scaling. Journal of Petroleum Science and Engineering 27 (1–2): 85–106. http://dx.doi.org/10.1016/S0920-4105(00)00050-4.
Vazquez, O., McCartney, R. A., and Mackay, E. 2013. Produced-Water-Chemistry History Matching Using a 1D Reactive Injector/Produced Reservoir Model. SPE Prod & Oper 28 (4): 369–375. SPE-164113-PA. http://dx.doi.org/10.2118/164113-PA.