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Wettability Alteration of Reservoir Rocks to Super Gas-Wet Condition Using Nanocomposite by Applying Contact Angle Measurement for Gas-Crude Oil System

Zandi, Ahmad | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55085 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ghazanfari, Mohammad Hossien; Fatemi, Mobeen; Esmaeilzadeh, Pouriya
  7. Abstract:
  8. Today, increasing the productivity of reservoirs is more important than in the past, while the use of nanoparticles to change the wettability of rock and increase the recovery factor from the reservoir has been considered by many researchers. Despite previous studies on the use of nanoparticles to change the wettability of rock to gas-wet, the use of nanocomposites with super gas-wet at high temperature and pressure in the crude oil-gas system has rarely been considered. In this research, several nanocomposites with different structures have been synthesized in the laboratory and nanofluids with different formulations have been used to coat the rock thin sections and measure droplet contact angle as a criterion for wettability. In this study, the contact angle of the droplets was measured for distilled water and crude oil sample from a reservoir in the south of Iranor even low surface tension liquids such as normal heptane and normal hexane. The results of contact angle measurements showed that several nanocomposites such as KCo/ZrCeO2 and ZnO/SnO2 super gas rock samples. The use of both nanocomposites caused the surface to be very repulsive to water and the contact angle of the oil droplets was measured to be 166o and 163o , respectively. The surface coated with KCo/ZrCeO2 nanocomposite showed good mechanical stability so that by abrasion on sandpaper #600 at a distance of 2400 cm and under the pressure of 2450 Pascals, the contact angle of water and oil is still above 120o. In order to bring the test conditions closer to the reservoir conditions, the contact angle was measured at a pressure of 4100 Psi and a temperature of 110 ° C for oil droplets in the presence of methane and nitrogen gases. It was observed that even at high temperatures and pressures, the coated rocks with the nanocomposite, preserve the super gas-wet property well. The results of the TEM test showed that the nanocomposites have an average size of 50 nm and the images obtained from FESEM and AFM analyses confirmed the proper adsorption of the nanocomposites on the surface, which resulted in the wettability alteration of the rock by increasing the surface roughness. XRD revealed a tetragonal structure for the cerium zirconium oxide nanocrystalline and FTIR confirmed the presence of zirconium, cerium and cobalt oxides. The super gas-wet properties of the nanofluids synthesized in this study suggest that they are good candidates for use in upstream industries to increase oil recovery
  9. Keywords:
  10. Super Gas-Wet ; Wettability Alteration ; Nanocomposite ; High Pressure High Temperature (HPHT) ; Contact Angle ; Efficiency Maximization ; Oil Reservoirs ; Gas-Crude Oil System

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