1887

Abstract

Summary

A robust analysis of a polymer flooding inter-well pilot start-up in a brown oil field was performed. The objective was to analyze the polymer injection performance to verify the in-situ preservation of the injected viscosity, key condition for the expected EOR effect.

The adopted workflow focused on the integration of different analyses. Indeed, several phenomena may occur during polymer injection, such as complex injectivity behavior due to polymer non-Newtonian rheological nature, formation damage caused by particles adsorption, fractures opening, and mechanical degradation of the solute. Our injection performance analysis considered the following aspects: literature studies, polymer laboratory tests, shear stress through perforation evaluation, diagnostic plots, injectivity test interpretation, well test analysis, and fracturing investigation. Eventually, numerical simulations allowed us to integrate the different disciplines, thoroughly capturing the subsurface polymer behavior. Main conclusion is that injection under fracturing conditions occurred during pilot start-up. These small-scale fractures are localized in the near-wellbore zone and lead to a satisfactory well injectivity.

Furthermore, no evidence of mechanical degradation was detected.

The evaluation of the subsurface polymer behavior during an inter-well pilot is crucial to verify the correct polymer injection process. Robust reservoir monitoring is ongoing and preliminary promising effects are now being shown.

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/content/papers/10.3997/2214-4609.201700237
2017-04-24
2020-07-06
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References

  1. Al-saadi, F.S., Al-amri, B.A., Al Nofli, S.M., Van Wunnik, J., Jaspers, H.F., Al Harthi, K., Cherukupalli, P.K. and Chakravarthi, R.
    [2012] Polymer Flooding in a Large Field in South Oman – Initial Results and Future Plans. Paper SPE 154665 presented at the SPE EOR Conference at Oil and Gas West Asia, Muscat, Oman, 16–18 April.
    [Google Scholar]
  2. Braccalenti, E., Albonico, P., Romero-Zeron, L., Parasiliti Parracello, V., Masserano, F. and Del Gaudio, L.
    [2013] Polymer flooding – Designing of a Pilot Test for Unusually High Salinity and Hardness Reservoir. Paper presented at the IOR 2013 – 17th European Symposium on Improved Oil Recovery, St. Petersburg, Russia, 16–18 April.
    [Google Scholar]
  3. Buell, R.S., Kazemi, H. and Poettmann, F.H.
    [1990] Analyzing Injectivity of Polymer Solutions With the Hall Plot. SPE Reservoir Engineering, 5(01), 41–46.
    [Google Scholar]
  4. Callegaro, C., Bartosek, M., Nobili, M., Masserano, F. and Pollero, M.
    [2015] Design and Implementation of Low Salinity Waterflood in a North African Brown Field. Paper SPE 177590 presented at the Abu Dhabi International Petroleum Exhibition and Conference, Abu Dhabi, UAE, 9–12 November.
    [Google Scholar]
  5. Gumpenberger, T., Deckers, M. and Kornberger, M.
    [2012] Experiments and simulation of the near-wellbore dynamics and displacement efficiencies of polymer injection, Matzen Field, Austria. Paper SPE 161029 presented at the Abu Dhabi International Petroleum Conference and Exhibition, Abu Dhabi, UAE, 11–14 November.
    [Google Scholar]
  6. HIS Marikit Group
    [2012]. Fekete Associates Inc. Minifrac Tests web source: http://www.fekete.com/SAN/TheoryAndEquations/WellTestTheoryEquations/Minifrac.htm.
  7. Lake, L.W.
    [1989] Enhanced Oil Recovery. Prentice Hall, Los Angeles, California, USA.
    [Google Scholar]
  8. Maffeis, I., Renna, S., Mattei, M., Quattrocchi, S., Galli, G. and Elgany, M.A.A.
    [2017] Application of Thermally Activated Polymers in a mature oil filed: candidates selection, field implementation and preliminary results. Presented at the 13th Offshore Mediterranean Conference and Exhibition, Ravenna, 29–31 March.
    [Google Scholar]
  9. Moe Soe Let, K.P., Manichand, R.N., and Seright, R.S.
    [2012] Polymer Flooding a ~500-cp Oil. Paper SPE 154567 presented at the SPE Improved Oil Recovery Symposium, Tulsa, Oklahoma, USA, 14–18 April.
    [Google Scholar]
  10. Morel, D.C., Zaugg, E., Jouenne, S., Danquigny, J.A. and Cordelier, P.R.
    [2015] Dalia/Camelia Polymer Injection in Deep Offshore Field Angola Learnings and In Situ Polymer Sampling Results. Paper SPE 174699 presented at the SPE Asia Pacific Enhanced Oil Recovery Conference, Kuala Lumpur, Malaysia, 11–13 August.
    [Google Scholar]
  11. Sheng, J.J.
    [2011] Modern Chemical Enhanced Oil Recovery Theory and Practice. Elsevier, Burlington, Vermont, USA.
    [Google Scholar]
  12. Sheng, J.J., Leonhardt, B. and Azri, N.
    [2015] Status of Polymer-Flooding Technology. Journal of Canadian Petroleum Technology, 54(02), 116–126.
    [Google Scholar]
  13. Shuaili, K., Cherukupalli, K., Al-Saadi, F.S., Al Hashmi, K., Jaspers, H.F. and Sen, S.
    [2012] Fracture Growth Monitoring in Polymer Injectors – Field Examples. Paper SPE 160967 presented at the Abu Dhabi International Petroleum Conference and Exhibition, Abu Dhabi, UAE, 11–14 November.
    [Google Scholar]
  14. Singh, P.K., Agarwal, R.G. and Krase, L.D.
    [1987] Systematic Design and Analysis of Step-Rate Tests to Determine Formation Parting Pressure. Paper SPE 16789 presented at the 62nd SPE Annual Technical Conference and Exhibition, Dallas, Texas, USA, 27–30 September.
    [Google Scholar]
  15. SNF Floerger
    [2011] Injection of polymer solution from surface to wellbore: mechanical and chemical degradation. Presentation for the Force forum for Improved oil and gas recovery (IOGR), Stavanger, Norway, 30 May.
    [Google Scholar]
  16. Zechner, M., Buchgraber, M., Clemens, T., Gumpenberger, T., Castanier, L.M. and Kovscek, A.R.
    . [2013] Flow of Polyacrylamide Polymers in the Near-Wellbore-Region, Rheological Behavior within Induced Fractures and Near-Wellbore Area. Paper SPE 166085 presented at the SPE Annual Technical Conference and Exhibition, New Orleans, Louisiana, USA, 30 September – 2 October.
    [Google Scholar]
  17. Zechner, M., Clemens, T., Suri, A. and Sharma, M.M.
    [2015] Simulation of Polymer Injection under Fracturing Conditions – A Field Pilot in the Matzen Field, Austria. SPE Reservoir Evaluation & Engineering, 18(02), 236–249.
    [Google Scholar]
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