A Step Change for Single-Well Chemical-Tracer Tests: Field Pilot Testing of New Sets of Novel Tracers
- Mohammed A. AlAbbad (Saudi Aramco) | Modiu L. Sanni (Saudi Aramco) | Sunil Kokal (Saudi Aramco) | Alexander Krivokapic (Institutt for Energiteknikk) | Christian Dye (Institutt for Energiteknikk) | Øyvind Dugstad (Restrack) | Sven K. Hartvig (Restrack) | Olaf K. Huseby (Restrack)
- Document ID
- Society of Petroleum Engineers
- SPE Reservoir Evaluation & Engineering
- Publication Date
- February 2019
- Document Type
- Journal Paper
- 253 - 265
- 2019.Society of Petroleum Engineers
- EOR, Novel, CO2, Tracers, IOR
- 8 in the last 30 days
- 174 since 2007
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The single-well chemical-tracer test (SWCTT) is an in-situ test to measure oil saturation, and has been used extensively to assess the potential for enhanced oil recovery (EOR) or to qualify particular EOR chemicals and methods. An SWCTT requires that a primary tracer be injected and that a secondary tracer be generated from the primary tracer in situ. Typically, a few hundred liters of ester is injected as primary tracer, and the secondary tracer is formed through hydrolysis in the formations. The ester is an oil/water-partitioning tracer, whereas the in-situ-generated alcohol is a water tracer. During production, these tracers separate and the time lag of the ester vs. the alcohol is used to estimate oil saturation in the near-well region.
In this paper, we report a field test of a class of new reacting tracers for SWCTTs. In the test, approximately 100 cm3 of each of the new tracers was injected and used to assess oil saturation. In the test, ethyl acetate (EtAc) was used as a benchmark to verify the new tracers. This paper reviews the design and implementation of the test, highlights operational issues, provides a summary of the analyzed tracer curves, and gives a summary of the interpretation methodology used to find oil saturations from the tracer curves. Briefly summarized, we find the Sor measured by each of the novel tracers to compare with that from a conventional SWCTT. To validate stability and detectability of the tracers, a mass-balance assessment for the new tracers is compared with that of the conventional tracers.
A benefit of the new tracers is the small amount needed. Methodological advantages resulting from using small amounts include the possibility to inject a mix of several tracers. Using several tracers with different partitioning coefficients enables probing of different depths of the reservoir. In addition, the robustness of SWCTTs can be increased by using several tracers, with different reaction rates and temperature sensitivity. The field trial also demonstrated that the new tracers have operational advantages. One benefit is the possibility to inject the new tracers as a short pulse of 10 minutes. Other benefits are that the small amounts needed reduce operational hazards and ease logistical handling.
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Agca, C., Pope, G. A., and Sepehrnoori, K. 1990. Modelling and Analysis of Tracer Flow in Oil Reservoirs. J. Pet. Sci. Eng. 4 (1): 3–19. https://doi.org/10.1016/0920-4105(90)90042-2.
Al-Mutairi, S. M. and Kokal, S. L. 2011. EOR Potential in the Middle East: Current and Future Trends. Presented at the SPE EUROPEC/EAGE Annual Conference & Exhibition, Vienna, Austria, 23–26 May. SPE-143287-MS. https://doi.org/10.2118/143287-MS.
Aurdal, T., Cheng, N., Sagen, J. et al. 2001. History Matching of Gas Tracer Data to Identify and Estimate Gas Storage Volumes in a North Sea Oil Field. Oral presentation given at the Canadian International Petroleum Conference, Calgary, 12–14 June.
Babadagli, T. 2007. Development of Mature Oil Fields—A Review. J. Pet. Sci. Eng. 57 (3–4): 221–246. https://doi.org/10.1016/j.petrol.2006.10.006.
Bear, J. 1972. Dynamics of Fluids in Porous Media. Mineola, New York: Dover Publications.
Callegaro, C., Masserano, F., Bartosek, M. et al. 2014. Single Well Chemical Tracer Tests to Assess Low Salinity Water and Surfactant EOR Processes in West Africa. Presented at the International Petroleum Technology Conference, Kuala Lumpur, 10–12 December. IPTC-17951-MS. https://doi.org/10.2523/IPTC-17951-MS.
Chatzichristos, C., Sagen, J., Huseby, O. et al. 2000. Advanced Numerical Modelling for Tracer Flow. Proc., Tracers and Modelling in Hydrogeology, TraM’2000 Conference, Liège, Belgium, May, Vol. 262, 17–23.
De Zwart, A. H., van Batenburg, D. W., Stoll, M. et al. 2011. Numerical Interpretation of Single Well Chemical Tracer Tests for ASP Injection. Oral presentation given at the 16th European Symposium on Improved Oil Recovery, Cambridge, UK, 12–14 April.
Deans, H. 1971. Method of Determining Fluid Saturations in Reservoirs. US Patent No. 3,623,842.
Deans, H. and Carlisle, C. 2007. The Single Well Chemical Tracer Test—A Method for Measuring Reservoir Fluid Saturations In-Situ. In Petroleum Engineering Handbook, Vol. 5, ed. E. D. Holstein, Chapter 5, 615–649. Richardson, Texas: Society of Petroleum Engineers.
Dugstad, Ø. 2007. Well-to-Well Tracer Tests. In Petroleum Engineering Handbook, Vol. 5, ed. E. D. Holstein, Chapter 6, 651–683. Richardson, Texas: Society of Petroleum Engineers.
Gelhar, L. W. and Collins, M. A. 1971. General Analysis of Longitudinal Dispersion in Nonuniform Flow. Water Resour. Res. 7 (6): 1511–1521. https://doi.org/10.1029/WR007i006p01511.
Govan, A., Primmer, T., Douglas, C. et al. 2006. Reservoir Management in a Deepwater Subsea Field—The Schiehallion Experience. SPE Res Eval & Eng 9 (4): 382–390. SPE-96610-PA. https://doi.org/10.2118/96610-PA.
Hernandez, C., Chacon, L., Anselmi, L. et al. 2001. Single Well Chemical Tracer Test to Determine ASP Injection Efficiency at Lagomar VLA-6/9/21 Area, C4 Member, Lake Maracaibo, Venezuela. Presented at the SPE/DOE Improved Oil Recovery Symposium, Tulsa, 13–17 April. SPE-75122-MS. https://doi.org/10.2118/75122-MS.
Huseby, O., Sagen, J., and Dugstad, Ø. 2011. Gas Tracer Transport—Correct Formulation and Fast Post-Processing Simulation Technique. Presented at the SPE EUROPEC/EAGE Annual Conference and Exhibition, Vienna, Austria, 23–26 May. SPE-142991-MS. https://doi.org/10.2118/142991-MS.
Huseby, O., Sagen, J., and Dugstad, Ø. 2012. Single Well Chemical Tracer Tests—Fast and Accurate Simulations. Presented at the SPE EOR Conference at Oil and Gas West Asia, Muscat, Oman, 16–18 April. SPE-155608-MS. https://doi.org/10.2118/155608-MS.
Huseby, O., Andersen, M., Svorstøl, I. et al. 2008a. Improved Understanding of Reservoir Fluid Dynamics in the North Sea Snorre Field by Combining Tracers, 4D Seismic, and Production Data. SPE Res Eval & Eng 11 (4): 768–777. SPE-105288-PA. https://doi.org/10.2118/105288-PA.
Huseby, O., Rein, E., Dugstad, Ø. et al. 2008b. Using Tracer Data to Improve Petroleum Reservoir Models. Oral presentation given at TRACER 5, the 5th International Conference on Tracers and Tracing Methods, Tiradentes, Brazil, 2–6 November.
Illiassov, P. A. and Datta-Gupta, A. 2002. Field-Scale Characterization of Permeability and Saturation Distribution Using Partitioning Tracer Tests: The Ranger Field, Texas. SPE J. 7 (4): 409–422. SPE-81198-PA. https://doi.org/10.2118/81198-PA.
Jerauld, G. R., Mohammadi, H., and Webb, K. J. 2010. Interpreting Single Well Chemical Tracer Tests. Presented at the SPE Improved Oil Recovery Symposium, Tulsa, 24–28 April. SPE-129724-MS. https://doi.org/10.2118/129724-MS.
Jin, M., Delshad, M., Dwarakanath, V. et al. 1995. Partitioning Tracer Test for Detection, Estimation, and Remediation Performance Assessment of Subsurface Nonaqueous Phase Liquids. Water Resour. Res. 31 (5): 1201–1211. https://doi.org/10.1029/95WR00174.
McGuire, P., Chatham, J., Paskvan, F. et al. 2005. Low Salinity Oil Recovery: An Exciting New EOR Opportunity for Alaska’s North Slope. Presented at the SPE Western Regional Meeting, Irvine, California, 30 March–1 April. SPE-93903-MS. https://doi.org/10.2118/93903-MS.
Oyemade, S., Al Harty, S., Jaspers, H. et al. 2010. Alkaline-Surfactant-Polymer Flood (ASP): Single Well Chemical Tracer Tests—Design, Implementation and Performance. Presented at the SPE EOR Conference at Oil & Gas West Asia, Muscat, Oman, 11–13 April. SPE-130042-MS. https://doi.org/10.2118/130042-MS.
Press, W. H., Teukolsky, S. A., Vetterling, W. T. et al. 2007. Numerical Recipes: The Art of Scientific Computing, third edition. New York City: Cambridge University Press.
Saad, N. and Sepehrnoori, K. 1989. Simulation of Big Muddy Surfactant Pilot. SPE Res Eng 4 (1): 24–34. SPE-17549-PA. https://doi.org/10.2118/17549-PA.
Sanni, M., Al-Abbad, M., Kokal, S. et al. 2016. Pushing the Envelope of Residual Oil Measurement: A Field Case Study of a New Class of Inter-Well Chemical Tracers. Presented at the SPE Annual Technical Conference and Exhibition, Dubai, 26–28 September. SPE-181324-MS. https://doi.org/10.2118/181324-MS.
Sayfritz, S. and Krivokapic, A. 2015. Sporingsstoff. (Tracers). Norwegian Patent No. 338291 and WO Application No. WO2015181398 A1.
Seccombe, J. C., Lager, A., Webb, K. et al. 2008. Improving Wateflood Recovery: LoSalTM EOR Field Evaluation. Presented at the SPE Symposium on Improved Oil Recovery, Tulsa, 20–23 April. SPE-113480-MS. https://doi.org/10.2118/113480-MS.
Skrettingland, K., Holt, T., Tweheyo, M. T. et al. 2011. Snorre Low-Salinity-Water Injection—Coreflooding Experiments and Single-Well Field Pilot. SPE Res Eval & Eng 14 (2): 182–192. SPE-129877-PA. https://doi.org/10.2118/129877-PA.
Wellington, S. and Richardson, E. 1994. Redesigned Ester Single-Well Tracer Test That Incorporates pH-Driven Hydrolysis Rate Changes. SPE Res Eng 9 (4): 233–239. SPE-24135-PA. https://doi.org/10.2118/24135-PA.
Welty, C. and Gelhar, L. W. 1994. Evaluation of Longitudinal Dispersivity From Nonuniform Flow Tracer Tests. J. Hydrol. 153 (1–4): 71–102. https://doi.org/10.1016/0022-1694(94)90187-2.
Zaberi, H., Al-Mosa, M. A., and Huseby, O. 2013. Improved Reservoir Surveillance Through Injected Tracers in a Saudi Arabian Field: Case Study. Presented at the SPE Reservoir Characterization and Simulation Conference and Exhibition, Abu Dhabi, 16–18 September. SPE-166005-MS. https://doi.org/10.2118/166005-MS.
Zainal, S., Manap, A. A. A., Hamid, P. A. et al. 2008. Offshore Chemical EOR: The Role of an Innovative Laboratory Program in Managing Result Uncertainty to Ensure the Success of a Pilot Field Implementation. Presented at the Europec/EAGE Conference and Exhibition, Rome, 9–12 June. SPE-113154-MS. https://doi.org/10.2118/113154-MS.