Encouraging Chemical EOR Field Results: First Multi-Well ASP Flooding Pilot Project in a Carbonate Reservoir Worldwide

Author:

Al-Murayri Mohammed Taha1,Sulaiman Dawood S.1,Hassan Abrahim Abdelgadir1,Al-Ajmi Naser A.1,Thery Bastien2,Maillon Remi2,Nesbit Jimmy2,Pitts Malcolm John3,Dean Elio3,Skeans Elii3,Dean Robert Matthew4,Britton Chris James4

Affiliation:

1. Kuwait Oil Company

2. SNF

3. Surtek, Inc.

4. Ultimate EOR Services

Abstract

Abstract Alkaline-Surfactant-Polymer Flooding (ASP) has the potential to unlock massive oil reserves in quest of production sustenance within the bounds of profitable economics. Field results from a successful ASP pilot targeting the massive Sabriyah Mauddud (SAMA) reservoir in Kuwait, using a regular five-spot with five acre-spacing are encouraging. Oil cut post softened water pre-flushing reached 0% and tracer data indicated pre-mature breakthrough at the central producer. This necessitated in-depth conformance gel treatment1-3 to induce flow under matrix conditions and softened water injection resumed thereafter for a period of ~3 months, during which oil cut ranged between 2 to 6%. Oil cut then decreased to 0% again, beyond which polymer pre-flushing was introduced for a period of ~2 months, during which oil cut was increased to up to ~4%. ASP flooding resulted in an unambiguous and sustainable increase in oil cut with an average of ~12% over a period of more than 6 months. Furthermore, daily oil production rate after ASP flooding more than doubled. Effective oil-water separation of produced emulsion has been established and maintained using fit-for-purpose pre-heating, chemical dosing and gravity segregation technologies, thus resulting in relatively low BS&W levels in separated oil (i.e., <5%). Potential in-situ scale risks were effectively managed by injection an innovative scale inhibition package composed of inhibited glacial acetic acid in conjunction with a phosphonate-polymeric scale inhibitor into the capillary tubing string of the central producer, during which 100% production uptime was achieved for several months3. Field data demonstrated that in-situ scale risks due to ASP injection were originally overstated because scale issues were limited even without injecting the adopted scale inhibition package. ASP reservoir simulation forecasts indicate that oil rates and oil cut should continue to increase. ASP flooding is ongoing to date and continues to generate important operational learnings and priceless field data to evaluate the techno-economic viability of phased ASP flooding commercial development.

Publisher

SPE

Reference16 articles.

1. Al-Murayri, M. T., Al-Qenae, A., AlRukaibi, D., Chatterjee, M., & Hewitt, P. (2017). Design of a Partitioning Interwell Tracer Test for a Chemical EOR Pilot Targeting the Sabriyah Mauddud Carbonate Reservoir in Kuwait. SPE Kuwait Oil & Gas Show and Conference. Kuwait City, Kuwait: Society of Petroleum Engineers. doi: 10.2118/187549-MS

2. Al-Murayri, Mohammed T., Hassan, Abrahim A., Alrukaibi, Deema, Al-Qenae, Amna, Nesbit, Jimmy, Al Khoury, Philippe, Thery, Bastien, Zaitoun, Alain, Omonte, German, Salehi, Nazanine, Pitts, Malcolm J., Wyatt, Kon, and Elio S.Dean. "Design of in-Depth Conformance Gel Treatment to De-Risk ASP Flooding in a Major Carbonate Reservoir."Paper presented at the Abu Dhabi International Petroleum Exhibition & Conference, Abu Dhabi, UAE, November 2021. doi: 10.2118/208070-MS

3. Al-Murayri, MT., Sulaiman, D.S., Hassan, A., Nesbit, J., Thery, B., Al-Khoury, P., Zaitoun, A., Bouilot, J., Salehi, N., Pitts, M.J., Wyatt, K., and Dean, E.S.: "Field Implementation of In-Depth Conformance Gel Treatment Prior to Starting an ASP Flooding Pilot,"SPE-207850-MS, presented at the 2021a Abu Dhabi International Petroleum Exhibition & Conference (ADIPEC). doi: 10.2118/207850-MS

4. Al-Murayri, MT., Sulaiman, D.S., Al-Kharji, A., Al Kabani, M., Sobie, K.S., Ness, G., Pitts, M., and Salehi, M.: "Scale Mitigation for Field Implementation of Alkaline-Surfactant-Polymer (ASP) Flooding in a Heterogeneous High Temperature Carbonate Reservoir with High Divalent Cation Concentration in Formation Water,"presented at the 2021 Abu Dhabi International Petroleum Exhibition & Conference (ADIPEC). doi: 10.2118/207573-MS

5. Al-Murayri, M. T., Al-Kharji, A. A., Kamal, D. S., Al-Ajmi, M. F., Al-Ajmi, R. N., Al-Shammari, M. J., Al-Asfoor, T. H., Badham, S. J., Bouma, C., Brown, J.., and Hernandez P.Suniga. "Successful Implementation of a One-Spot Alkaline-Surfactant-Polymer ASP Pilot in a Giant Carbonate Reservoir."Paper presented at the SPE EOR Conference at Oil and Gas West Asia, Muscat, Oman, March 2018. doi: 10.2118/190374-MS

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