Water Shutoff with Polymer in the Alvheim Field
- Kåre Langaas (Aker BP ASA) | Arne Stavland (Norwegian Research Centre)
- Document ID
- Society of Petroleum Engineers
- SPE Production & Operations
- Publication Date
- May 2020
- Document Type
- Journal Paper
- 335 - 350
- 2020.Society of Petroleum Engineers
- EOR, relative permeability modifier, disproportionate permeability reduction, biopolymer, water shutoff
- 9 in the last 30 days
- 116 since 2007
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The Alvheim Field, offshore Norway, has subsea wells with long horizontal branches completed with sand screens. After 10 years of production, water production starts to constrain the oil production. Mechanical water shutoff is not possible in these wells; hence, other methods are of interest. In a well workover in 2013, two high-viscosity polymer pills were bullheaded and squeezed into the reservoir. The well productivity was reduced by approximately 50% and the water cut dropped, suggesting potentially higher oil recovery. A research study was started with the objectives of understanding the changed well performance and whether polymer bullheading can be a future method to reduce water production and enhance oil production.
An experimental laboratory program started with filtration tests of polymer solutions on the basis of the polymer used in the well operation. Coreflood experiments were performed by injecting polymer into two parallel-mounted cores and then back producing these individually with either water or oil. Several combinations of parallel cores were tested with polymer injection: high vs. low permeability, high oil saturation vs. low oil saturation, outcrop sandstone vs. Alvheim core, and two different polymer formulations.
The polymer formulation as used in the well operation demonstrated the plugging of standard filters with filter size larger than the reservoir pore sizes, but it did not plug the cores. The polymer formulation as used in the well gave a better disproportionate permeability reduction (DPR) than the alternative polymer variant with similar viscosity. A theoretical model for the shear rate in the porous media matched the experimentally measured data excellently. The core results show a stable permeability-reduction factor of 100 to 450 for water, while a factor of only 2 to 10 and decreasing with time for oil. The achieved DPR ratio of 45 to 80 is better than the trend from earlier published results.
The DPR as measured in the laboratory was next integrated into the reservoir model as part of the history match of the treated well. The Alvheim field has several reservoir zones separated with thin shales, and this reservoir zonation seems key for this enhanced-oil-recovery (EOR) method to work.
The laboratory work, the reservoir studies, and the field experience all point to a possible robust and simple EOR method for Alvheim and similar oil fields. Future work includes more research and maturing a new polymer pilot on Alvheim.
|File Size||12 MB||Number of Pages||16|
Chauveteau, G. and Zaitoun, A. 1981. Basic Rheology Behavior of Xanthan Polysaccharide Solutions in Porous Media: Effects of Pore Size and Polymer Concentration. Paper presented at the 1st European Symposium on Enhanced Oil Recovery, Bournemouth, UK, 21–23 September.
Davison, P. and Mentzer, E. 1982. Polymer Flooding in North Sea Reservoirs. SPE J. 22 (3): 353–362. SPE-9300-PA. https://doi.org/10.2118/9300-PA.
Goddard, J. E., White, J. L., Vanlandingham, J. et al. 1973. Use of Polymers To Control Water Production in Oils Wells. Paper presented at the SPE Rocky Mountain Regional Meeting, Casper, Wyoming, USA, 15–16 May. SPE-4407-MS. https://doi.org/10.2118/4407-MS.
Kalfayan, L. J. and Dawson, J. C. 2004. Successful Implementation of Resurgent Permeability Modifiers (RPM) Technology in Well Treatments Requires Realistic Expectations. Paper presented at the SPE Annual Technical Conference and Exhibition, Houston, Texas, USA, 26–29 September. SPE-90430-MS. https://doi.org/10.2118/90430-MS.
Kalpakci, B., Jeans, Y. T., Magri, N. F. et al. 1990. Thermal Stability of Scleroglucan at Realistic Reservoir Conditions. Paper presented at the SPE/DOE Enhanced Oil Recovery Symposium, Tulsa, Oklahoma, USA, 22–25 April. SPE-20237-MS. https://doi.org/10.2118/20237-MS.
Langaas, K. and Hjellbakk, A. 2015. Integrated Reservoir Modelling of the Alvheim Field. Paper presented at the SPE Bergen One Day Seminar, Bergen, Norway, 22 April. SPE-173875-MS. https://doi.org/10.2118/173875-MS.
Langaas, K., Hjellbakk, A., Leonthin, M. A. et al. 2016. Making a Cross-Flow Water Injector in the Alvheim Field. Paper presented at the SPE Annual Technical Conference and Exhibition, Dubai, UAE, 26–28 September. SPE-181489-MS. https://doi.org/10.2118/181489-MS.
Langaas, K., Jeurissen, E. J. W. G., and Abay, H. K. 2018. Combining Passive and Autonomous Inflow-Control Devices in a Trilateral Horizontal Well in the Alvheim Field. SPE Prod & Oper 34 (3): 446–460. SPE-187288-PA. https://doi.org/10.2118/187288-PA.
Lange, E. A. and Huh, C. 1994. A Polymer Thermal Decomposition Model and Its Application in Chemical EOR Process Simulation. Paper presented at the SPE/DOE Improved Oil Recovery Symposium, Tulsa, Oklahoma, USA, 17–20 April. SPE-27822-MS. https://doi.org/10.2118/27822-MS.
Morgan, J., Gunn, A., Fitch, G. et al. 2002. Development and Deployment of a “Bullheadable” Chemical System for Selective Water Shutoff Leaving Oil/Gas Production Unharmed. Paper presented at the 10th Abu Dhabi International Exhibition and Conference, Abu Dhabi, UAE, 13–18 October. SPE-78540-MS. https://doi.org/10.2118/78540-MS.
Schlumberger. 2016. Eclipse Technical Description. Sugar Land, Texas, USA: Schlumberger.
Seright, R. S. 2009. Disproportionate Permeability Reduction with Pore-Filling Gels. SPE J. 14 (1): 5–13. SPE-99443-PA. https://doi.org/10.2118/99443-PA.
Sorbie, K. S. 1991. Polymer-Improved Oil Recovery. Blackie, CRC Press Inc. https://www.springer.com/gp/book/9780216926936.
Stavland, A. 2010. How To Apply the Flow Velocity as a Design Criterion in RPM Treatments. SPE Prod & Oper 25 (2): 223–231. SPE-121850-PA. https://doi.org/10.2118/121850-PA.
Stavland, A. and Nilsson, S. 2001. Segregated Flow is the Governing Mechanism of Disproportionate Permeability Reduction in Water and Gas Shutoff. Paper presented at the SPE Annual Technical Conference and Exhibition, New Orleans, Louisiana, USA, 30 September–3 October. SPE-71510-MS. https://doi.org/10.2118/71510-MS.
Stavland, A., Andersen, K. I., Sandøy, B. et al. 2006. How To Apply a Blocking Gel System for Bullhead Selective Water Shutoff: From Laboratory to Field. Paper presented at the SPE/DOE Symposium on Improved Oil Recovery, Tulsa, Oklahoma, USA, 22–26 April. SPE-99729-MS. https://doi.org/10.2118/99729-MS.
Stavland, A., Ekrann, S., Hettervik, K. O. et al. 1998. Disproportionate Permeability Reduction Is Not a Panacea. SPE Res Eval & Eng 1 (4): 359–366. SPE-50983-PA. https://doi.org/10.2118/50983-PA.
Sydansk, R. D. and Seright, R. S. 2007. When and Where Relative Permeability Modification Water-Shutoff Treatments Can Be Successfully Applied. SPE Prod & Oper 22 (2): 236–247. SPE-99371-PA. https://doi.org/10.2118/99371-PA.
Sydansk, R. D. and Southwell, G. P. 2000. More Than 12 Years’ Experience with a Successful Conformance-Control Polymer-Gel Technology. SPE Prod & Fac 15 (4): 270–278. SPE-66558-PA. https://doi.org/10.2118/66558-PA.
Zaitoun, A., Kohler, N., Bossie-Codreanu, D. et al. 1999. Water Shutoff by Relative Permeability Modifiers: Lessons from Several Field Applications. Paper presented at the SPE Annual Technical Conference and Exhibition, Houston, Texas, USA, 3–6 October. SPE-56740-MS. https://doi.org/10.2118/56740-MS.