Interwell Tracer Tests To Optimize Operating Conditions for a Surfactant Field Trial: Design, Evaluation, and Implications
- Hao Cheng (Chevron Pacific Indonesia) | G. Michael Shook (Chevron Energy Technology Company) | Taimur Malik (Chevron Energy Technology Company) | Dwarakanath Varadarajan (Chevron Energy Technology Company) | Bruce R. Smith (Chevron Pacific Indonesia)
- Document ID
- Society of Petroleum Engineers
- SPE Reservoir Evaluation & Engineering
- Publication Date
- April 2012
- Document Type
- Journal Paper
- 229 - 242
- 2012. Society of Petroleum Engineers
- 5.4.7 Chemical Flooding Methods (e.g., Polymer, Solvent, Nitrogen, Immiscible CO2, Surfactant, Vapex), 5.5.8 History Matching, 5.7.2 Recovery Factors, 4.3.4 Scale, 5.6.5 Tracers, 2.5.2 Fracturing Materials (Fluids, Proppant), 2.4.3 Sand/Solids Control, 5.5 Reservoir Simulation, 5.5.11 Formation Testing (e.g., Wireline, LWD), 5.1.1 Exploration, Development, Structural Geology, 5.4.1 Waterflooding
- interpretation, field trial, tracer test, reservoir simulation, surfactant
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Enhanced oil recovery (EOR) by surfactant flooding is the key to unlocking the next billion barrels of oil for Minas, one of the world's largest waterflood fields. An interwell tracer test (ITT-1) was performed before a surfactant field trial (SFT) to ensure well injectivity, demonstrate pattern confinement, quantitatively describe interwell connectivity and sweep efficiency, and provide sufficient data for reservoir evaluation. The tracer test was designed by numerical simulation. The test started in November 2009 and was terminated in February 2010.
Analytical interpretation based on moment analysis and numerical reservoir simulations was conducted to evaluate ITT-1 results. Interpretation of the test results indicated various operational and reservoir properties that would have likely led to failure of the surfactant pilot. Hydraulic control of the SFT pattern was not achieved; in fact, less than 20% of one tracer was recovered. Many small-scale heterogeneities were identified that led to a lower-than-expected reservoir volume contacted. Unexpected communication between the target sand and the underlying sands outside the pattern also contributed to low tracer recovery and low swept volume. The tracer test was history matched, and additional features were incorporated in the reservoir model, and a new tracer design (ITT-2) was optimized to correct low sweep efficiency and poor hydraulic control. New information from ITT-2 will be used to further optimize operating conditions for SFTs.
Failure to conduct the tracer tests would have likely revealed these unfavorable reservoir and operational conditions during the SFT. Had oil recovery been poor (because of low swept volume), it would have erroneously been attributed to a poor SFT rather than to the true causes. ITT-1 is considered successful because it allowed us to redesign injection/hydraulic control during the relatively inexpensive tracer test and thus evaluate the surfactant trial without bias.
|File Size||4 MB||Number of Pages||14|
Allison, S.B., Pope, G.A., and Sepehrnoori, K. 1991. Analysis of fieldtracers for reservoir description. J. Pet. Sci. Eng. 5 (2):173-186. http://dx.doi.org/10.1016/0920-4105(91)90066-v.
Cheng, H., Datta-Gupta, A., and Zhong, H. 2005. A Comparison of Travel-Timeand Amplitude Matching for Field-Scale Production-Data Integration:Sensitivity, Nonlinearity, and Practical Implications. SPE J. 10 (1): 75-90. SPE-84570-PA. http://dx.doi.org/10.2118/84570-PA.
Cheng, H., Dehghani, K., and Billiter, T.C. 2008. A Structured Approach forProbabilistic-Assisted History Matching Using Evolutionary Algorithms: TengizField Applications. Paper SPE 116212 presented at the SPE Annual TechnicalConference and Exhibition, Denver, 21-24 September. http://dx.doi.org/10.2118/116212-MS.
Cubillos, H., Torgersen, H.J.T., Chatzichristos, C., and Tobio, M.L. 2006.Best Practice and Case Study of Interwell Tracer Program Designs. Paper SPE103891 presented at the First International Oil Conference and Exhibition inMexico, Cancun, Mexico, 31 August-2 September. http://dx.doi.org/10.2118/103891-MS.
Du, Y. and Guan, L. 2005. Interwell Tracer Tests: Lessons Learned from PastField Studies. Paper SPE 93140 presented at the SPE Asia Pacific Oil and GasConference and Exhibition, Jakarta, 5-7 April. http://dx.doi.org/10.2118/93140-MS.
Jasti, J.K., Vaidya, R.N., and Fogler, H.S. 1988. Capacitance Effectsin Porous Media. SPE Res Eng 3 (4): 1207-1214.SPE-16707-PA. http://dx.doi.org/10.2118/16707-PA.
Kocabas, I. and Al-Ain. 2003. Modeling Tracer Flow in Oil ReservoirsContaining High Permeability Streaks. Paper SPE 81429 presented at the MiddleEast Oil Show, Bahrain, 9-12 June. http://dx.doi.org/10.2118/81429-MS.
Liou, T.-S. 2007. Numerical Analysis of a Short-Term Tracer Experiment inFractured Sandstone. TAO Sciences 18 (5): 1029-1050. http://dx.doi.org/10.3319/TAO.2007.18.5.1029(Hy).
Shook, G.M. and Forsmann, J.H. 2005. Tracer Interpretation Using TemporalMoments on a Spreadsheet. INL/EXT-05-00400, Contract No. DE-AC07-05ID14517, USDOE/Battelle Energy Alliance, Idaho National Laboratory (INL), Idaho Falls,Idaho (June 2005), http://geothermal.inel.gov/software/docs/tracerinterpretation.pdf.
Shook, G.M., Pope, G.A., and Asakawa, K. 2009. Determining ReservoirProperties and Flood Performance From Tracer Test Analysis. Paper SPE 124614presented at the SPE Annual Technical Conference and Exhibition, New Orleans,4-7 October. http://dx.doi.org/10.2118/124614-MS.
Wolff, M. 2010. Probabilistic Subsurface Forecasting. Paper SPE 132957available from SPE, Richardson, Texas.