1887

Abstract

Summary

Tracer technology for well experiments is one of very few applicable technologies for collection of unique dynamic data of reservoir flows. Two main tracer tests are commonly used for reservoir characterization: (i) the Single-Well Chemical Tracer Test (SWCTT) and (ii) the Inter-Well Tracer Test (IWTT) which includes Partioning Inter-Well Tracer Tests (PITT). SWCTT and PITT give access to the residual oil saturation (SOR) respectively in the near-well and interwell regions. Non-partitioning IWTT allows assessing qualitatively and quantitatively interwell flow connections, swept volumes, etc., resulting in an improved reservoir model.

We have previously introduced the concept for a new class of potential partitioning fluorescent tracers for SWCTT tests (IOR 2017 in Stavanger, Norway ; EAGE conference). The tracer is a complex compound by an organic chelate and a fluorescent metallic center. The results have shown that it was possible to functionalize the chelate with an ester function to theoretically increase the affinity of the final complex for the oil phase. However, the complexation of the new modified chelate with the metallic center was not solved.

In the present study, the complexation strategies and characterization tools for detecting and quantifying the tracer will be discussed. Especially, High-Performance Liquid Chromatography (HPLC) coupled with a Time-Resolved Fluorescence (TRF) detection allowed separating the different partitioning compounds and their passive form with a high specificity. A series of partitioning tests have been carried-out using synthetic production water and both synthetic oil and a crude oil from the Norwegian continental shelf.

Against the expectation, close to 100% of the ester tracer was found in the aqueous phase after contact with the oil. This result has been confirmed for two tracers with different ester chain length (ethylester and butylester). Liquid Chromatography coupled with Mass Spectroscopy (LC-MS) characterizations performed on the butylester form before and after contact with oil have confirmed the observations and results obtained by HPLC. Moreover, the LC-MS characterization provided a better understanding about the environment of the metallic ion, particularly on its degree of complexation which suggests that most of the final complex is negatively charge.

Given that the reaction of hydrolysis of the ester is dependent on temperature, pH and salinity the tracer could be relevant as a “probe” to obtain accurate data on those three parameters in-situ. The ester has in this case no partitionning behavior and any changes in the previously cited parameters will affect its kinetic of hydrolysis.

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/content/papers/10.3997/2214-4609.201900062
2019-04-08
2020-04-05
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References

  1. Agenet, N., N.Moradi-Tehrani and O.Tillement
    (2011). Fluorescent Nanobeads: A New Generation of Easily Detectable Water Tracers. International Petroleum Technology Conference. Bangkok, Thailand, International Petroleum Technology Conference: 8.
    [Google Scholar]
  2. Agenet, N., P.Perriat, T.Brichart, N.Crowther, M.Martini and O.Tillement
    (2012). Fluorescent Nanobeads: a First Step Toward Intelligent Water Tracers. SPE International Oilfield Nanotechnology Conference and Exhibition. Noordwijk, The Netherlands, Society of Petroleum Engineers: 13.
    [Google Scholar]
  3. Al-Abbad, M., M.Sanni, S.Kokal, A.Krivokapic, C.Dye, Ø.Dugstad, S.Hartvig and O.Huseby
    (2016). A Step-Change for Single Well Chemical Tracer Tests (SWCTT): Field Pilot Testing of New Sets of Novel Tracers. SPE Annual Technical Conference and Exhibition. Dubai, UAE, Society of Petroleum Engineers: 16.
    [Google Scholar]
  4. Brichart, T., Ould Metidji, M., Ferrando-Climent, L. and Bjørnstad, T.
    (2017). New Fluorescent Tracers for SWCTT. IOR 2017 - 19th European Symposium on Improved Oil Recovery EAGE. Stavanger, Norway.
    [Google Scholar]
  5. Deans, H. A.
    (1971). Method of determining fluid saturations in reservoirs. USA, Exxon Production Research Co: patent US3590923 A.
    [Google Scholar]
  6. HorrocksJr, W. D. and D. R.Sudnick
    (1979). “Lanthanide ion probes of structure in biology. Laser-induced luminescence decay constants provide a direct measure of the number of metal-coordinated water molecules.”Journal of the American Chemical Society101(2): 334–340.
    [Google Scholar]
  7. Khaledialidusti, R. and J.Kleppe
    (2017). “A comprehensive framework for the theoretical assessment of the single-well-chemical-tracer tests.”Journal of Petroleum Science and Engineering159: 164–181.
    [Google Scholar]
  8. Marais, A., M.Martini, F.Lepoivre, M. OuldMetidji, A.Collet, O.Tillement, C.Hurtevent and S.Baraka-Lokmane
    (2016). “Time-Resolved Fluorescence for Real-Time Monitoring of Both Scale and Corrosion Inhibitors: A Game-Changing Technique”. SPE International Oilfield Scale Conference and Exhibition, 11–12 May, Aberdeen, Scotland, UK Society of Petroleum Engineers.
    [Google Scholar]
  9. Pedersen, T.
    (2018). “Properly designed temperature history nanoparticles may improve residual oil saturation estimates from SWCT tests.”Journal of Petroleum Science and Engineering170: 383–391.
    [Google Scholar]
  10. Sastri, V. S., J.-C.Bünzli, V. R.Rao, G. V. S.Rayudu and J. R.Perumareddi
    (2003). chapter 7 - kinetics and mechanisms of rare-earth complexation. Modern Aspects of Rare Earths and Their Complexes. Amsterdam, Elsevier: 481–567.
    [Google Scholar]
  11. Serres-Piole, C., H.Preud'homme, N.Moradi-Tehrani, C.Allanic, H.Jullia and R.Lobinski
    (2012). “Water tracers in oilfield applications: Guidelines.”Journal of Petroleum Science and Engineering98–99: 22–39.
    [Google Scholar]
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