Carbonate Rocks Wettability Changes Induced by Microbial Solution

Research output: Contribution to conferencePaperpeer-review

19 Citations (Scopus)


Contact angles are used to measure the wetting behavior of two immiscible fluids on a solid surface. Fluids are considered wettings if their contact angles with surface are less than 90°, and they are considered non-wetting, if their contact angles are greater than 90°. Because of its influence on other petrophysical properties of reservoir rocks, such as relative permeability, capillary pressure, and the residual oil saturation after a flood, wettability and its direct measure, the contact angle, play a significant role in affecting the recovery from both primary and improved recovery processes. In this work, contact angle alteration occurring in microbial enhanced oil recovery processes (MEOR) are quantififed and described, along with a study of the factors that would enhance such contact angle alteration. An experimental method for the measurement of contact angles has been developed in which the contact angle is measured as a function of time. Measurements of contact angle and interfacial tension for four different types of UAE crude oil and four different mineralogical rock composition over a range of microbial concentration, salinity, and temperature are reported. Results showed that contact angles for the studied systems increased with temperature, crude oil sulfur concentration and microbial concentration up to a certain concentration, beyond which the bacteria concentration exhibited no effect on the contact angle. Crude oils containing low asphaltene concentration produced a stable contact angle and oils containing high asphaltene concentration produced surfaces with unstable wettability. The mineralogical composition of limestone rocks had no effect on the contact angle of microbial-oil system.

Original languageEnglish
Number of pages10
Publication statusPublished - 2003
EventSPE Asia Pacific Oil and Gas Conference and Exhibition - Jakarta, Indonesia
Duration: Apr 15 2003Apr 17 2003


OtherSPE Asia Pacific Oil and Gas Conference and Exhibition

ASJC Scopus subject areas

  • Fuel Technology
  • Energy Engineering and Power Technology


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