1887

Abstract

Summary

The single well chemical tracer test (SWCTT) was introduced in the 1970ies by Deans and coworkers, and is commonly used to assess oil saturation in flooded reservoirs and to identify reduction in oil saturation after EOR. Reactive tracers are injected in a cylindrical volume in push-and-pull tests and the tracer hydrolyze in-situ to generate a secondary tracer. New SWCTT chemicals were piloted in a carbonate reservoir by Al Abbad et al. (2016), to overcome challenges such as flammability and the requirement for large amounts of chemicals associated with commonly used tracers, such as Ethyl Acetate. About 0.1 kg of the new tracers is sufficient, which should be compared to injected amounts up to several hundreds of kg for the traditional tracers.

The reduced tracer amount opens for injection of a cocktail of tracers with different affinity to oil and the individual tracers will explore cylindrical volumes of different radii. This can be exploited to assess gradients in the oil saturation or the fractional flow of oil and water. The new tracers also opens for new and improved operational methodologies (in addition to the obvious related to reducing injection amount). Such improvements include adding tracers in the well using a simple injection system. The chemicals are designed to enable off-site analysis, thus removing the requirement to mobilize a chemical lab to the field. The injection of a cocktail of tracers gives tracer curve pairs of injected and in-situ generated tracers. This abundance of data required implementation of effective interpretation schemes that are also presented.

In this paper, we summarize results findings from tests using the three new sets of tracer in sandstone and carbonate reservoirs. The paper summarizes design considerations and implementation of the tests, highlights operational improvements and demonstrate methods for interpretation of the results. The tracers are all shown to perform successfully at temperatures ranging from 50 – 100 C. They can all be injected simultaneously in a short pulse, and off-site analysis is shown to be a valid alternative to on-site analysis.

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/content/papers/10.3997/2214-4609.201900064
2019-04-08
2020-03-30
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References

  1. Al-AbbadM., SanniM., KokalS., KrivokapicA., DyeC.,DugstadØ., HartvigS. and HusebyO.
    : A Step-Change for Single Well Chemical-Tracer Tests: Field Pilot Testing of New Sets of Novel Tracers. SPE Paper Number 181408. SPE Reservoir Evaluation & Engineering. June2018.
    [Google Scholar]
  2. CallegaroC, MasseranoF, BartosekM, BuscagliaR, VisintinR, HartvigSK, HusebyOK
    : Single Well Chemical Tracer Tests to Assess Low Salinity Water and Surfactant EOR Processes in West Africa. IPTC paper 17951, International Petroleum Technology Conference, 10–12 December, Kuala Lumpur, Malaysia, 2014.
    [Google Scholar]
  3. Cooke, C. E.Jr.
    Method of determining fluid saturations in reservoirs. US Patent No. 3,590,923. 1971.
    [Google Scholar]
  4. DeansH
    : Method of determining fluid saturations in reservoirs, US patent # 3623842, 1971.
    [Google Scholar]
  5. DeansH and CarlisleC
    : The single well chemical tracer test a method for measuring reservoir fluid saturations in-situ. pp 615–649, Petroleum Engineering Handbook by L.W.Lake (Ed), Vol. 5 Reservoir Engineering and Petrophysics. SPE 2007
    [Google Scholar]
  6. DugstadØ.
    Well-to-Well Tracer Tests, Chapter 6 (pp. 651–683), Petroleum Engineering Handbook, Vol. 5 - Reservoir Engineering and Petrophysics by Edward D.Holstein (Ed.) SPE, Richardson, Texas, 2007.
    [Google Scholar]
  7. HernandezC, ChaconL, AnselmiL, AnguloR, ManriqueE, RomeroE, de AudemardN, CarlisleC
    : Single Well Chemical Tracer Test to Determine ASP Injection Efficiency at Lagomar VLA-6/9/21 Area, C4 Member, Lake Maracaibo, Venezuela. SPE/DOE Improved Oil Recovery Symposium, 13–17 April 2002, Tulsa, Oklahoma
    [Google Scholar]
  8. HusebyO. K., GaldigaC., ZarrukG. A., JuriJ. E., LuceroR. A., Salaun, M.
    : “ Field testing of a new generation single well chemical tracer chemicals in high temperature conditions”. EGYPS 2019 Technical Conference at the Egypt Petroleum Show11–13 February 2019.
    [Google Scholar]
  9. JerauldGR, MohammadiH and WebbKJ
    : Interpreting Single Well Chemical Tracer Tests. SPE paper 129724. SPE Improved Oil Recovery Symposium, 24–28 April, Tulsa, Oklahoma, USA, 2010
    [Google Scholar]
  10. McGuireP, ChathamJ, PaskvanF, SommerD and CarirniF
    : Low salinity oil recovery: An exciting new EOR opportunity for Alaska's North Slope. SPE paper 93903, Proc. SPE Western Regional Meeting, Irvin, CA. 2005
    [Google Scholar]
  11. Oyemade, S., Al Harty, S., Jaspers, H., van Wunnik, J., de Kruijf, A. and W.M., S.
    : Alkaline-surfactantpolymer flood: Single well chemical tracer tests - design, implementation and performance. SPE 130042, Proc. SPE EOR conference at Oil & Gas West Asia, Muscat, Oman, 2010.
    [Google Scholar]
  12. SayfritzS. and KrivokapicA.
    : Sporingsstoff. (Tracers). Norwegian patent 338291, also published as WO2015181398 A1 (PCT/EP2015/062180), 3Dec.2015.
    [Google Scholar]
  13. SkrettinglandK, HoltT, TweheyoMT and SkjevrakI
    , Snorre low salinity water injection - core flooding and single well field pilot. SPE 129877, SPE Reservoir Evaluation & Engineering, Vol 14, No. 2, pp. 182–192, 2011.
    [Google Scholar]
  14. SeccombeJC, LagerA, WebbK, JerauldG and FuegE
    : Improving Wateflood Recovery: LoSal™ EOR Field Evaluation. SPE paper 113480. SPE/DOE IOR Symposium, 20–23 April, Tulsa, USA, 2008
    [Google Scholar]
  15. ViigS.O., JuillaH., RenoufP., KlevenR., KrognesB., DugstadØ., HusebyO.K.
    2013. Application of a New Class of Chemical Tracers To Measure Oil Saturation in Partitioning Interwell Tracer Tests. SPE paper no. 164059. 2013 SPE International Symposium on Oilfield Chemistry, Apr 08 – 10, The Woodlands, TX, USA.
    [Google Scholar]
  16. WellingtonS and RichardsonE
    : Redesigned ester single-well tracer test that incorporates ph driven hydrolysis rate changes. SPE Res. Eng., pp 233–239. 1994
    [Google Scholar]
  17. ZainalS, ManapAAA, HamidPA, OthmanM, ChongMO, YahyaAW, DarmanN, SaiRM
    : Offshore Chemical EOR: The Role of an Innovative Laboratory Program in Managing Result Uncertainty to Ensure the Success of a Pilot Field Implementation. SPE paper 113154. EUROPEC/EAGE Conference and Exhibition, 9–12 June, Rome, Italy, 2008.
    [Google Scholar]
  18. de ZwartAH, van BatenburgDW, StollM and Al-HarthiS.
    Numerical Interpretation of Single Well Chemical Tracer Tests for ASP Injection. 16th European Symposium on Improved Oil Recovery, Cambridge, UK, 12–14 April 2011.
    [Google Scholar]
  19. ZaberiH., Al MosaM. H., HusebyO.
    : “Improved Reservoir Surveillance through Injected Tracers in a Saudi Arabian Oil field: Case Study,” SPE paper 166005, SPE Reservoir Characterization and Simulation Conference & Exhibition, Abu Dhabi UAE, 16-18 September, 2013.
    [Google Scholar]
  20. Modiu L.Sanni, Mohammed A.Al-Abbad, Sunil L.Kokal, SvenHartvig, HusebyOlaf, JevanordKjersti
    : “A Field Case Study of Inter-Well Chemical Tracer Test”. SPE paper 173760. SPE International Symposium on Oilfield Chemistry. The Woodlands, Texas, USA, 13–15 April 2015.
    [Google Scholar]
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