Nanoparticle-stabilized CO2 foams to improve conventional CO2 EOR process at Batı Raman field

Safran, Saibe Esra
Because of the natural fractured characteristic of the B. Raman field which is the largest field of Turkey, already existing CO2 injection system does not work at desired efficiency. Thus, the main purpose of this project is to control CO2 mobility in the reservoir by creating nanoparticle stabilized CO2 foam using the property of nanoparticles to place at the gas-water interface permanently and to achieve additional oil recovery at B. Raman. For this purpose, first nanoparticle dispersion stabilization and foamability were evaluated. Dealing with the nanoparticle due to their high surface energy is not easy as bulk material. They have high tendency to agglomerate and/or flocculate. Different type of nanosilica was considered. Effect of the nanoparticle concentration, salinity, temperature and pH on the foamability and dispersion stabilization were examined. This studies showed that half hydrophobicity, salt addition and increased concentration have positive effect on the foamability but salinity above 1% generated flocculation. Also, even if the 50 % hydrophobic nanosilica called H30 has better foamability, it could not be stabilized. The particle size of the silica in H30 dispersion was not small enough to flow through the B. Raman core sample. The effect of the pressure, phase ratio and flow rate on the foam formation were also studied. Better foam was observed at the observation cell when CO2: nanodispersion phase ratio was 1. Also, it was found that the pressure should be above 1100 psi where CO2 was in the supercritical phase to create foam with current core flooding system. The phase envelop of the Dodan gas was created by using PVTSim program. XRF test results before and after flooding showed that not any adsorption occurred into core sample. Then, the oil recovery test was conducted with suitable nanoparticles which were PEG and CC301. First, CO2 injection and then WAG were applied to the core sample to express B. Raman field case and obtained extra production after CO2 injection with WAG application. NWAG (nanoparticle dispersion alternating gas) at 650 psi and foam at 1200 psi was tested, later. The results indicated that foam application was successful if appropriate conditions existed. On the other hand, not a significant production was obtained with NWAG application. Interfacial measurements were also studied between both nanodispersion-CO2 and nanodispersion-oil. Nanoparticles were not changing IFT markedly even if they were located at the interface of the water and CO2 as the surfactant. However, a significant decrease of the IFT was obtained between water and oil in the presence of nanoparticles.


Nanoparticle-stabilized CO2 foam to improve conventional CO2 EOR process and recovery at Bati Raman oil field, Turkey
Safran, S. Esra; Kök, Mustafa Verşan (2022-01-01)
(B.Raman), which is the largest oil field of Turkey's already existing CO2 injection system, does not produce at the desired efficiency due to the natural fracture characteristics. Therefore, this research is performed to control the CO2 mobility in the reservoir by creating nanoparticle stabilized CO2 foam using the property of nanoparticles to be adsorbed at the gas-water interface permanently and to achieve additional oil recovery at the B. Raman oil field. In the initial stage of the research, dispersio...
Smart water displacement an alternative enhanced oil recovery technique
Polat, Can; Parlaktuna, Mahmut; Saner, Salih; Department of Petroleum and Natural Gas Engineering (2015)
The aim of this study is to investigate the effect of smart water displacement on oil recovery. The brine samples were prepared considering the characteristics of the samples proved to be effective in oil recovery. The effect of these brine samples on rock wettability was observed using Modified Flotation Test (MFT) procedure. The effect of changing brine salinity on interfacial tension between brine and oil samples was observed using interfacial tension meter and ring tensiometer. Liquids used in spontaneo...
Solar generated steam injection in heavy oil reservoirs
Afşar, Cansu; Akın, Serhat; Department of Petroleum and Natural Gas Engineering (2014)
Turkey is one of the countries having mostly heavy oil reservoirs with 10-15˚ API gravity. Due to high amount of residual oil in the reservoir, thermal injection methods are evaluated to increase recovery in south-east of Turkey. However, the fuel cost of steam generation, that represents 60% of the total project cost, is a major challenge for companies. Combination of solar generated steam technology and heavy oil recovery techniques encourage companies to reduce the operation costs. This solar aided steam...
Dynamic response analysis of the machine foundations on a nonhomogeneous soil layer
Aşık, Mehmet Zülfü (1999-01-01)
Real modulus of elasticity of the soil usually increases with the depth of the soil due to the increase in overburden pressure. Therefore, incorporation of the effect of the soil inhomogeneity in the formulation to obtain the response of the machine foundations is an important and a necessary step. In this paper, equations that govern the dynamic behavior of the machine foundations and consider the inhomogeneity of the elastic foundation, particularly for Gibson type soil are derived by using variational pr...
Random walk particle modelling of polymer injection using matlab reservoir simulation toolbox
Mamak, Gökhan; Durgut, İsmail; Department of Petroleum and Natural Gas Engineering (2017)
Enhanced oil recovery (EOR) is essential to increase the maximum recoverable oil by natural means of production. Having chosen an EOR method, the effectiveness of the method should be analyzed before applying to a reservoir since the methods are generally costly. Polymer injection is a chemical EOR process, where the injected polymer with water increases the water viscosity, and help increasing the sweep efficiency in the reservoir. In order to model the effects of polymer injection, the random-walk particl...
Citation Formats
S. E. Safran, “Nanoparticle-stabilized CO2 foams to improve conventional CO2 EOR process at Batı Raman field,” Thesis (Ph.D.) -- Graduate School of Natural and Applied Sciences. Petroleum and Natural Gas Engineering., Middle East Technical University, 2019.