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Rheological Properties of Wormlike Micelles Formed by Anionic Surfactant and a Applied Study on the Oil Displacement Agents in Enhanced Oil Recovery

Author: JiYongQiang
Tutor: ZhengLiQiang
School: Shandong University
Course: Physical and chemical
Keywords: Wormlike micelles Rheological properties EOR Displacing agent
CLC: O648.1
Type: Master's thesis
Year: 2008
Downloads: 447
Quote: 1
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Abstract


The first two chapters discuss the paper studied the rheological properties of anionic surfactant wormlike micelles. The rheological properties of the surfactant aggregates have a direct relationship with the interaction between the system micro-structure and the internal group, the basic theory and practical application of surface active agents have a very important research value. This paper studies the anionic surfactant sodium oleate (NaOA) / inorganic electrolytes sodium phosphate the (Na 3 PO 4 ) wormlike micelles formed rheological properties factors, including surfactant concentration, electrolyte concentration, temperature, low molecular weight alcohol, n-alkanes, inorganic salts, the oilfield water salinity, polymer Rheological Properties. Theoretically rich study of the rheological properties of the surfactant, to broaden the application of the anionic surfactant in the industry, especially in the field of oil exploration, provides an important theoretical basis. 3 PO from ScS anionic surfactant NaOA inorganic electrolytes Na 4 the presence of the shear viscosity change start, by freeze-fracture transmission electron microscopy and rheology experiments confirmed NaOA / Na 3 PO 4 system may be formed in a suitable surfactant and electrolyte concentration wormlike micelles. NaOA / Na 3 PO 4 the wormlike micelles system as pseudoplastic fluid, there is no yield stress phenomenon, basically in line with the Cox-Merz rule. Lower shear rate, shear viscosity of the system did not change significantly; micelle network structure is destroyed when the shear rate is high, leaving the shear viscosity decreased. Wormlike micellar system of the storage modulus and loss modulus curves intersect at a certain oscillation frequency. The low frequency loss modulus, highly viscous; high frequency storage modulus, elastic, strong. The system dynamic viscoelasticity in line with the Maxwell model. Further examine other factors on the Rheological Properties found: with increasing temperature, the system shear viscosity decreased, the greater the viscosity of the system shear flow activation energy is smaller. Accumulation the factor R p reduced low molecular weight alcohol and n-octane are added to the surfactant micelles by the worm-like transition to globular shear viscosity decreased. Combined with the practical application of EOR, to examine sodium, magnesium concentration, and oilfield water salinity wormlike micellar system. The results show that, with the solution salinity increases, the the system shear viscosity decreased, but not significantly, indicating the high salinity on NaOA / Na 3 PO 4 < / sub> Micellar structure and rheological properties have little effect. Partially hydrolyzed polyacrylamide (HPAM) with because of their negative charge and oleic acid ions with a strong repulsion, so HPAM added a certain degree of inhibition of micellar growth and the formation of the network structure, reduce the shear viscosity. The HPAM concentration is large, the shear viscosity will be increased significantly. The third chapter island of crude oil, Shengli Oilfield EOR oil displacement agent screening and application of a more systematic and comprehensive study. Measured through the oil-water interfacial tension experiments and indoor Mimic Oil was found that Dow Chemical Company series displacing agent not make the island of crude oil oil-water interfacial tension to achieve ultra-low, and is not suitable for oil recovery applications in the oil fields of island. The flooding system formed by the modified natural carboxylate surfactant agents HF-2, and twin carboxylate surfactant C18 and complex alkali, not only make the oil-water interfacial tension to ultra-low, but also has the effect of flooding, more effectively to drive out the residual oil in the water flooding. The wormlike micelles Rheological Properties of the theoretical basis, we wormlike micelles system used in tertiary oil recovery. Flooding system does not contain polymers, both to improve the efficiency of wash oil, but also improve sweep efficiency. Indoor simulation flooding experimental results show that the system of oil displacement efficiency more than 20% of the basic, wormlike micelles system as a displacing agent, it does have a good prospect of application in EOR.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Colloid chemistry ( physical and chemical dispersion system ) > Colloid
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