1887

Abstract

Summary

Wettability controls the distribution of fluid phases and flow properties in oil reservoirs. Wettability characterization can be accomplished using standard techniques such as Amott-Harvey and USBM. Nevertheless, these experiments are time consuming and limited numbers are carried out for each oil reservoir. The objective is to evaluate the possibility to use the flotation technique combined with geochemical simulations for fast wettability characterization.

The flotation technique relies on the affinity of the minerals to either the brine or the oil, and was used to characterize the wettability of minerals. The amounts of oil-wet particles is determined for the mineral-brine-oil mixtures after aging the mineral in brine and oil respectively. Two formation water compositions and two stock tank oils were selected for the flotation experiments. As an introduction to this study, the wettability of six (6) minerals found in sandstone reservoir rocks were investigated by flotation test. The mineral-brine interactions such as solubility and surface complexation of minerals were modelled with the geochemical simulator PHREEQ-C, and the results were compared with their experimental counterpart. The flotation tests showed that the crude oils altered the wettability of some of the water-wet minerals to oil-wet. It was inferred that the clay minerals were less water-wet. Calcite with cationic surfaces, became more oil-wet by aging with crude oil, and this indicated direct adsorption of carboxylic acids.

Surface Complexation Modelling (SCM) results reveal that the surface charges of both quartz-brines and STOs-brine are mostly negatively charged and hence electrostatic repulsion exist between the two interfaces leading to lack of oil adhesion. Unlike quartz, the calcite-brine and the STOs-brine interfaces were positively and negatively charged respectively. Hence, direct adhesion of the polar oil components onto the calcite surface is the reason for the high oil-wet nature of calcite. This was also consistent with the total bond product which expresses the tendency of oil adhesion onto minerals surfaces. The total bond product for calcite (0.95 – 1.06) was greater than quartz (0.01 – 0.07) and hence confirming that more oil was adsorbed on the calcite surface unlike quartz. Both the SCM and the flotation test results reaveal that the calcite is strongly oil-wet while quartz is strongly water-wet.

The flotation technique combined with geochemical simulation is a promising and cheap approach of characterizing the wettability. In the flotation tests only small rock samples are required. This approach has the potential to provide fast estimation of the wettability of reservoir rocks.

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2017-04-24
2021-10-17
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References

  1. Anderson, W.
    [1986]. Wettability literature survey-part 2: Wettability measurement. Journal of petroleum technology38(11): 1246–1262. SPE-13933-PA. http://dx.doi.org/10.2118/13933-PA.
    [Google Scholar]
  2. Appelo, C. A. J. and Postma, D.
    [2004]. Geochemistry, groundwater and pollution, CRC press.
    [Google Scholar]
  3. Buckley, J. and Liu, Y.
    [1998]. Some mechanisms of crude oil/brine/solid interactions. Journal of Petroleum Science and Engineering20(3): 155–160. http://dx.doi.org/10.1016/S0920-4105(98)00015-1.
    [Google Scholar]
  4. Buckley, J., Liu, Y. and Monsterleet, S.
    [1998]. Mechanisms of wetting alteration by crude oils. SPE Journal3(01): 54–61. SPE-37230-PA. http://dx.doi.org/10.2118/37230-PA.
    [Google Scholar]
  5. Buckley, J., Takamura, K. and Morrow, N.
    [1989]. Influence of electrical surface charges on the wetting properties of crude oils. SPE Reservoir Engineering4(03): 332–340. SPE-16964-PA. http://dx.doi.org/10.2118/16964-PA.
    [Google Scholar]
  6. Chen, Y. and Brantley, S. L.
    [1997]. Temperature-and ph-dependence of albite dissolution rate at acid ph. Chemical Geology135(3–4): 275–290. http://dx.doi.org/10.1016/S0009-2541(96)00126-X.
    [Google Scholar]
  7. Craig, F. J.
    [1971]. The reservoir engineering aspect of waterflooding. Dallas, Texas, Society of Petroleum Engineering of AIME. ISBN: 978-0-89520-202-4.
    [Google Scholar]
  8. Cuiec, L.
    [1975]. Restoration of the natural state of core samples. Fall Meeting of the Society of Petroleum Engineers of AIME, Dallas, Texas, USA, 28 September-1 October. SPE-5634-MS. http://dx.doi.org/10.2118/5634-MS
    [Google Scholar]
  9. [1984]. Rock/crude-oil interactions and wettability: An attempt to understand their interrelation. In: SPE Annual Technical Conference and Exhibition, Houston, Texas, USA, 16–19 September. SPE-13211-MS. http://dx.doi.org/10.2118/13211-MS.
    [Google Scholar]
  10. Donaldson, E. C. and Alam, W.
    [2013]. Wettability, Gulf Publishing Company. Huston, Texas, USA. ISBN 13: 9781933762296.
    [Google Scholar]
  11. Dubey, S. and Doe, P.
    [1993]. Base number and wetting properties of crude oils. SPE Reservoir Engineering8(03): 195–200. SPE-22598-PA. http://dx.doi.org/10.2118/22598-PA.
    [Google Scholar]
  12. Dubey, S. and Waxman, M.
    [1991]. Asphaltene adsorption and desorption from mineral surfaces. SPE Reservoir Engineering6(03): 389–395. SPE-18462-PA. http://dx.doi.org/10.2118/18462-PA.
    [Google Scholar]
  13. Erzuah, S., Fjelde, I. and Omekeh, A. V.
    [2017]. Wettability estimation by surface complexation simulations. SPE Europec featured at 79th EAGE Annual Conference & Exhibition, Paris, France, 12–15 June. SPE-185767-MS.
    [Google Scholar]
  14. Fan, T., Wang, J. and Buckley, J. S.
    [2002]. Evaluating crude oils by SARA analysis. In: SPE/DOE Improved Oil Recovery Symposium, Tulsa, Oklahoma, USA, 13–17 April. SPE-75228-MS. http://dx.doi.org /10.2118/75228-MS.
    [Google Scholar]
  15. Goldberg, S.
    [2013]. Surface complexation modelling. Journal of Colloid and Interface Science.
    [Google Scholar]
  16. Hjuler, M. and Fabricius, I. L.
    [2009]. Engineering properties of chalk related to diagenetic variations of upper cretaceous onshore and offshore chalk in the north sea area. Journal of Petroleum Science and Engineering, 68(3–4): 151–170. http://dx.doi.org/10.1016/j.petrol.2009.06.005.
    [Google Scholar]
  17. Jones, A. A.
    [1981]. Charges on the surfaces of two chlorites. Clay Miner16: 347–359. DOI: 10.1180/claymin.1981.016.4.04
    https://doi.org/10.1180/claymin.1981.016.4.04 [Google Scholar]
  18. Langmuir, D.
    [1997]. Aqueous environmental geochemistry, Prentice Hall Upper Saddle River, NJ. ISBN 0023674121, 9780023674129
    [Google Scholar]
  19. Mitchell, A., Hazell, L. and Webb, K.
    [1990]. Wettability determination: Pore surface analysis. In: SPE Annual Technical Conference and Exhibition, 23–26 September, New Orleans, Louisiana, USA. SPE-20505-MS. http://dx.doi.org/10.2118/20505-MS.
    [Google Scholar]
  20. Mwangi, P., Thyne, G. and Rao, D.
    [2013]. Extensive experimental wettability study in sandstone and carbonate-oil-brine systems: Part 1–screening tool development. In: International Symposium of the Society of Core Analysts held in Napa Valley, California, USA, 16–19 September.
    [Google Scholar]
  21. Parkhurst, D. L. and Appelo, C.
    [2013] Description of input and examples for phreeqc version 3—a computer program for speciation, batch-reaction, one-dimensional transport, and inverse geochemical calculations. https://pubs.usgs.gov/tm/06/a43/
  22. Plummer, C. C., McGeary, D. and Carlson, D. H.
    [1991]. Physical geology, McGraw-Hill. ISBN-13: 978-0072528152.
    [Google Scholar]
  23. Zhang, P. and Austad, T.
    [2005]. The relative effects of acid number and temperature on chalk wettability. In: SPE International Symposium on Oilfield Chemistry, Society of Petroleum Engineers, 2–4 February, The Woodlands, Texas, USA. SPE-92999-MS. http://dx.doi.org/10.2118/92999-MS.
    [Google Scholar]
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