Early-Time Analysis of Tracers for Use in Enhanced-Oil-Recovery Flood Optimization
- G. Michael Shook (Chevron Energy Technology Company) | Abhinav Sharma (Rex Energy Corporation) | Gary A. Pope (University of Texas at Austin)
- Document ID
- Society of Petroleum Engineers
- SPE Reservoir Evaluation & Engineering
- Publication Date
- February 2017
- Document Type
- Journal Paper
- 30 - 41
- 2017.Society of Petroleum Engineers
- Early-time, Optimize, Tracer, Analytic solutions
- 43 in the last 30 days
- 307 since 2007
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Tracer testing is a powerful tool for reservoir surveillance. Conducting and analyzing an interwell tracer test (IWTT) before starting an enhanced-oil-recovery (EOR) flood provides specific information required to balance the pattern’s swept pore volume (PV) and to optimize chemical or solvent use. Tracer testing also plays an important role in EOR by establishing a baseline for estimating incremental volume swept and recovery factor.
A key limitation to tracer testing is the time required to obtain a complete interpretation of the test results. Conventional interpretation methods require observing exponential decline in the tracer concentration from all producers; depending on the pattern size and processing rate, this can take many months or years. Meanwhile, the EOR flood is delayed, thereby eroding its value and reducing the remaining oil target. We have developed a method for analyzing tracer data from relatively early times that is based, in part, on a new way to extrapolate the tracer data, providing timely information to optimize flood performance. The extrapolation can be performed soon after the peak tracer concentration is observed in the well with the slowest response. We illustrate the extrapolation procedure with a synthetic, yet realistic, data set showing that the new methods result in a good approximation at much earlier times. We then compare ‘early time analysis’ swept PVs with the (correct) swept PVs using the complete tracer data set. We also discuss how early-time approximations can thus provide the opportunity to optimize chemical-flood performance and to enable field startup of EOR floods in a timely fashion.
|File Size||1 MB||Number of Pages||12|
Asakawa, K. 2005. A Generalized Analysis of Partitioning Interwell Tracer Tests, PhD dissertation, The University of Texas at Austin (December).
Cheng, H., Shook, G. M., Malik, T. et al. 2012. Interwell Tracer Tests to Optimize Operating Conditions for a Surfactant Field Trial: Design, Evaluation, and Implications. SPE Res Eval & Eng 15 (2). SPE-144899-PA. http://dx.doi.org/10.2118/144899-PA.
Crank, J. 1956. The Mathematics of Diffusion. Oxford: Clarendon Press.
Danckwerts, P. V. 1953. Continuous Flow Systems, Distribution of Residence Times. Chemical Engineering Science 2 (1): 1–13. http://dx.doi.org/10.1016/0009-2509(53)80001-1.
Deans, H. A. 1978. Using Chemical Tracers to Measure Fractional Flow and Saturation In-Situ. Presented at the Fifth SPE Symposium on Improved Methods for Oil Recovery, Tulsa, USA, 16–19 April. SPE-7076-MS. http://dx.doi.org/10.2118/7076-MS.
Dugstad, Ø. 2007. Well-to-Well Tracer Tests. In Petroleum Engineering Handbook, Vol. 5—Reservoir Engineering and Petrophysics, Chap. 6, 651–683, ed. Edward D. Holstein. Richardson, Texas: SPE.
Huseby, O., Hartvig, S. K., Jevanord, K. et al. 2015.. Assessing EOR Potential From Partitioning Tracer Data. Presented at the SPE Middle East Oil & Gas Show and Conference, Manama, Bahrain, 8–11 March. SPE-172808-MS. http://dx.doi.org/10.2118/172808-MS.
Jin, M., Delshad, M., Dwarakanath, V. et al. 1995. Partitioning Tracer Test for Detection, Estimation and Performance Assessment of Subsurface Nonaqueous Phase Liquids. Water Resource Research 31 (5): 1201–1210. http://dx.doi.org/10.1029/95WR00174.
Maroongroge, V. 1994. Modeling and Application of Tracers for Reservoir Characterization, PhD Dissertation, The University of Texas at Austin (December).
Shook, G. M. and Forsmann, J. H. 2005. Tracer Interpretation Using Temporal Moments on a Spreadsheet, INL report 05-00400, June (Rev. 1 Sept 2005).
Shook, G. M., Pope, G. A., and Asakawa, K. 2009. Determining Reservoir Properties and Flood Performance From Tracer Test Analysis. Presented at the SPE Annual Technical Conference and Exhibition, New Orleans, USA, 4–7 October. SPE-124614-MS. http://dx.doi.org/10.2118/124614-MS.
Viig, S. O., Juilla, H., Renouf, P. et al. 2013. Application of a New Class of Chemical Tracers To Measure Oil Saturation in Partitioning Interwell Tracer Tests. Presented at the SPE International Symposium on Oilfield Chemistry, The Woodlands, Texas, 8–10 April. SPE-164059-MS. http://dx.doi.org/10.2118/164059-MS.