Carbonate reservoirs, particularly limestones and dolomites, represent more than a half of world’s oil resources. Typically, carbonate rocks have complex structure and consist of a variety of minerals. For this reason, the characterization of such reservoirs is extremely complicated. Nevertheless, for successful oil production, it is very important to describe all mechanisms and parameters that control oil recovery.

One of such essential factors needed to be measured is wettability. Formation wettability plays major role in fluids distribution through the porous media and, as result, determines the oil production. Moreover, wetting properties influence capillary pressure effects, water- and chemical flooding. Therefore, performing the wrong assumption of formation wettability may cause an unexpected oil recovery decrease and wellbore damage.

Herein, we present the wettability measurements for carbonate samples from oil fields by the direct visualizing of phases interfaces using environmental SEM-imaging method. Water micro-sessile droplets were formed on samples surfaces due to the special thermodynamic conditions, which were created in a microscope chamber using Peltier table. Wetting properties were analyzed by observing contact angles between water droplets and surfaces. It was shown that carbonates have mixed wetting properties even at microscale.


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  1. Abdallah, W., Buckley, J.S., Carnegie, J., Edwards, J., Fordham, B.H.E., Graue, A., Habashy, T., Seleznev, N., Signer, C., Hussain, H., Montaron, B., Ziauddin, M.
    [2007] Fundamentals of wettability. Oilfield review, 44–61.
    [Google Scholar]
  2. Alotaibi, M.B., Azmy, R., Nasr-El-Din, H.A.
    [2010] Wettability challenges in carbonate reservoirs. SPE Improved Oil Recovery Symposium, Tulsa.
    [Google Scholar]
  3. Amott, E.
    [1959] Observations relating to the wettability of porous rock. Petroleum Transactions, AIME, 216, 156–162.
    [Google Scholar]
  4. Austad, T., Matre, B., Milter, J., Saevareid, A., & Øyno, L.
    [1998] Chemical flooding of oil reservoirs and Spontaneous oil expulsion from oil-and water-wet low permeable chalk material by imbibition of aqueous surfactant solutions. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 137 (1), 117–129.
    [Google Scholar]
  5. Bakhshi, E., Torab, F. M.
    [2015] Determining Wettability of Fractured Carbonate Reservoirs. Natural Resources Research, 25 (2), 211–225.
    [Google Scholar]
  6. Donaldson, E., Thomas, R. D., & Lorenz, P. B.
    [1969] Wettability determination and its effect on recovery efficiency. Bureau of Mines, Bartlesville.
    [Google Scholar]
  7. Hopkins, P.A., Strand, S., Puntervold, T., Austad, T., Dizaj, S.R., Waldeland, J.O., Simonsen, J.C.
    [2016] The adsorption of polar components onto carbonate surfaces and the effect on wetting. Journal of Petroleum Science and Engineering, 147, 381–387.
    [Google Scholar]
  8. Lu, J., Goudarzi, A., Chen, P., Kim, D. H., Delshad, M., Mohanty, K. K., Sepehrnoori, K., Weerasooriya, U.P., Pope, G.A.
    [2014] Enhanced oil recovery from high-temperature, high-salinity naturally fractured carbonate reservoirs by surfactant flood. Journal of Petroleum Science and Engineering, 124, 122–131.
    [Google Scholar]
  9. Thomas, M.M., Clouse, J.A., Longo, L.M.
    [1993] Adsorption of organic compounds on carbonate minerals: 1. Model compounds and their influence on mineral wettability. Chemical Geology, 109 (1–4), 201–213.
    [Google Scholar]
  10. Yuan, Y., Lee, T.R.
    [2013] Contact Angle and Wetting Properties. Surface Science Techniques, 51, 3–34.
    [Google Scholar]

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