The Impact of Field Measurements and Data-Handling Procedures on Carbonate- and Sulfide-Scale Prediction
- Giulia Ness (Heriot-Watt University) | K. S. Sorbie (Heriot-Watt University)
- Document ID
- Society of Petroleum Engineers
- SPE Production & Operations
- Publication Date
- May 2019
- Document Type
- Journal Paper
- 361 - 372
- 2019.Society of Petroleum Engineers
- scale, H2S, alkalinity, carbonate, CO2
- 9 in the last 30 days
- 89 since 2007
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Carbonate and sulfide scales are directly coupled together and differ from other inorganic scales because they are intimately linked to the in-situ concentrations of carbon dioxide (CO2) and hydrogen sulfide (H2S), which influence the local pH and availability of reactive species.
The CO2 in aqueous solutions has the most significant effect on the system pH, on the solution content of bicarbonate ion (HCO3–), and on the final alkalinity. However, the presence of H2S in the system also has a direct and important effect on the total-system alkalinity. When calcium carbonate deposition occurs in a depressurized aqueous fluid, the amount of scale (CaCO3) that forms depends on the initial (prescaling) solution alkalinity. Thus, the occurrence and severity of carbonate scale are linked to both the solution carbonate system (CO2/HCO3–/CO32–) and the sulfide system (H2S/HS–/S2–).
In previous publications, we have described a rigorous work flow (step-by-step procedure) to accurately predict carbonate- and sulfide-scaling profiles from reservoir to separator using commonly available field data (Verri et al. 2017a). Although, with perfect data, the work flow is rigorous [i.e., it will correctly predict the types and amounts of scale that can occur in some carbonate systems (e.g., CaCO3, FeCO3, FeS)], the numerical results produced are, of course, subject to errors of different types.
In this paper, we identify and describe three key categories of data and procedures that must be correctly gathered and used to obtain accurate carbonate- and sulfide-scale predictions: These relate to field measurements, data-handling procedures, choice of software, model equations, and parameters. Moreover, in this work, the impact of unreliable field measurements on the final carbonate and sulfide scaling profiles is estimated, with a specific focus on gas- and water-chemistry errors. By varying important parameters such as Ca2+ concentration and gas-phase CO2 and H2S, it is possible to assess the impact that errors in these measurements have on the final scale-prediction profiles. Because of the closely coupled nature of the carbonate and sulfide systems, it is essential to consider “groups” of variables that change together.
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Amend, J. P., Edwards, K. J., and Lyons, T. W. 2004. Sulfur Biogeochemistry—Past and Present, Vol. 379. Boulder, Colorado: The Geological Society of America (Reprint). https://doi.org/10.1130/SPE379.
Burger, E. D., Jenneman, G. E., and Carroll, J. J. 2013. On the Partitioning of Hydrogen Sulfide in Oilfield Systems. Presented at the SPE International Symposium on Oilfield Chemistry, The Woodlands, Texas, 8–10 April. SPE-164067-MS. https://doi.org/10.2118/164067-MS.
Danesh, A. 1998. PVT and Phase Behaviour of Petroleum Reservoir Fluids. Vol. 47, first edition. Amsterdam: Elsevier.
Guan, H. 2010. Carbonate-Scaling Prediction: The Importance of Valid Data Input. Proc., NACE Conference, San Antonio, Texas. NACE-10132. https://doi.org/10.17265/2161-6213/2011.02.016.
Kaasa, B. and Ostvold, T. 1997. Alkalinity in Oil Field Waters. What Alkalinity is and How it is Measured. Presented at the International Symposium of Oilfield Chemistry, Houston, 18–21 February. SPE-37277-MS. https://doi.org/10.2118/37277-MS.
Kan, A. T. and Tomson, M. B. 2010. Scale Prediction for Oil and Gas Production. Presented at the International Oil and Gas Conference and Exhibition in China, Beijing, 8–10 June. SPE-132237-MS. https://doi.org/10.2118/132237-MS.
Kontogeorgis, G. M. and Folas, G. K. 2009. Thermodynamic Models for Industrial Applications: From Classical and Advanced Mixing Rules to Association Theories, first edition. West Sussex, UK: Wiley.
Larsen, T., Ostvold, T., and McCartney, R.A. 2010. Understanding CaCO3 Precipitation During Oil Recovery. Presented at the 21st International Oilfield Chemistry Symposium, Geilo, Norway, 15–17 March.
NACE. 2012. Monitoring Corrosion in Oil and Gas Production With Iron Counts. Standard SP0192-2012, NACE International.
Ness, G. and Sorbie, K. S. 2018. Rigorous Carbonate and Sulphide Scale Predictions: What Really Matters? Presented at the SPE International Oilfield Scale Conference and Exhibition, Aberdeen, 20–21 June. SPE-190726-MS. https://doi.org/10.2118/190726-MS.
Olajire, A. A. 2015. A Review of Oilfield Scale Management Technology for Oil and Gas Production. Journal of Petroleum Science and Engineering 135: 723–737. https://doi.org/10.1016/j.petrol.2015.09.011.
Pedersen, K. S. and Christensen, P. L. 2007. Phase Behavior of Petroleum Reservoir Fluids, first edition. Indianapolis: CRC Press—Taylor & Francis Group.
Pitzer, K. S., Peiper, J. C., and Busey, R. H. 1984. Thermodynamic Properties of Aqueous Sodium Chloride Solutions. Journal of Physical and Chemical Reference Data 13 (1): 1–102. https://doi.org/10.1063/1.555709.
Rickard, D. and Luther, G. W. 2007. Chemistry of Iron Sulfides. Chemical Reviews 107 (2): 514–562. https://doi.org/10.1021/cr0503658.
Verri, G. and Sorbie, K. S. 2017. Iron Sources in Sour Wells: Reservoir Fluids or Corrosion? Proc., NACE Corrosion Conference, New Orleans, 26–30 March. C2017-8998.
Verri, G., Sorbie, K. S., and Silva. D. 2017a. A Rigorous General Workflow for Accurate Prediction of Carbonate and Sulphide Scaling Profiles in Oil and Gas Wells. Journal of Petroleum Science and Engineering 156: 673–681. https://doi.org/10.1016/j.petrol.2017.06.037.
Verri, G., Sorbie, K. S., Singleton, M. A. et al. 2017b. Iron Sulphide Scale Management in High H2S and CO2 Carbonate Reservoirs. SPE Prod & Oper 32 (3): 305–313. SPE-179871-PA. https://doi.org/10.2118/179871-PA.
Vetter, O. J., Bent, M., Kandarpa, V. et al. 1987. Three-Phase PVT and CO2 Partitioning. Presented at the SPE California Regional Meeting, Ventura, California, 8–10 April. SPE-16351-MS. https://doi.org/10.2118/16351-MS.
Vetter, O. J. and Farone, W. A. 1987. Calcium Carbonate Scale in Oilfield Operations. Presented at the SPE Annual Technical Conference and Exhibition, Dallas, 27–30 September. SPE-16908-MS. https://doi.org/10.2118/16908-MS.