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Effect of Time and Temperature on Crude Oil Aging to do a Right Surfactant Flooding with a New Approach

Authors
Mohammad A Heidari (Islamic Azad University Science and Research branch) | Ali Habibi (University of Tehran) | Shahab Ayatollahi (Shiraz University) | Mohsen Masihi (Sharif University of Technology) | Sefatallah Ashoorian (Sharif University of Technology)
DOI
https://doi.org/10.4043/24801-MS
Document ID
OTC-24801-MS
Publisher
Offshore Technology Conference
Source
Offshore Technology Conference-Asia, 25-28 March, Kuala Lumpur, Malaysia
Publication Date
2014
Document Type
Conference Paper
Language
English
ISBN
978-1-61399-312-5
Copyright
2014. Offshore Technology Conference
Disciplines
2.5.2 Fracturing Materials (Fluids, Proppant), 5.8.7 Carbonate Reservoir, 5.7.2 Recovery Factors, 5.4.7 Chemical Flooding Methods (e.g., Polymer, Solvent, Nitrogen, Immiscible CO2, Surfactant, Vapex), 2.1.3 Sand/Solids Control, 5.4.1 Waterflooding, 5.3.2 Multiphase Flow, 5.2.1 Phase Behavior and PVT Measurements, 1.6.10 Coring, Fishing, 5.3.4 Reduction of Residual Oil Saturation
Keywords
contact angle, coreflooding, IFT, wettability alteration, carbonate core
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Dilute Surfactant flooding is one of the significant processes in chemical flooding. Many oil reservoirs became appropriate candidates for surfactant/water flooding when screening criteria developed. Injected surfactant tries to mobilize the residual oil that was trapped in interstice. The main contributing mechanism for oil recovery improvement by surfactant flooding is rock wettability alteration. Wettability is a one of the proper index in choosing the best approach for a successful surfactant flooding which tiny change in wettability alteration will lead to improve oil recovery.
This experimental study investigated the effect of different aging time and temperature on wettability alteration with exact soaking time to find the optimum condition. Afterwards, coreflooding experiments were performed to determine the impact of dilute cationic surfactant slug with huff ‘n’ puff(cyclic 7 days) method on displacement sweep efficiency in the carbonate core from one of the Iranian oil field. Besides, contact angle and interfacial tension (IFT) measurements were done to provide the supplementary data for a surfactant/waterflooding. The optimum concentrations of C19tab, were determined by measuring interfacial tension values of the crude oil in contact with surfactant solutions, which were prepared from synthetic saline water.
The results obtained from laboratory showed a reduction in residual oil saturation by changing contact angle and IFT reduction between oil and water. Aging is known as important parameter for researcher to alter the wettability. Furthermore it proves effect of wettability alteration is more than IFT reduction.

File Size  456 KBNumber of Pages   7

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