Chinese ink nanofluids were prepared successfully by “two-step” method. The optical properties of Chinese ink nanofluids were investigated. And the effects of the base fluid types and ultrasonic time on their dispersion stability also were investigated. Results show that Chinese ink have high absorption characteristics and very low transmittance on light radiation in the wavelength range of 190-1100 nm; The dispersion stability of nanofluids increases first and then decreases with the increase of ultrasonic dispersion time. There is an optimal ultrasonic dispersion time of 90 min; the base fluid has a certain influence on the dispersion stability of Chinese ink nanofluid, among which DMF base solution has the best dispersion stability, followed by thermal conductive oil. Ethanol has no obvious improvement compared with water, both of which have lower dispersion stability than DMF and thermal conductive oil. This research provides a fundamental guidance for the preparation of Chinese ink nanofluids and their further application in Solar photo-thermal conversion.
In this paper, the variation of viscosity with time is studied under condition of different influencing factors such as shearing time, mass concentration, salinity and temperature. The applicable conditions are optimized as following: The optimum mass concentration, salinity and temperature through laboratory experiment is 3000 mg/L~4000 mg/L, 40000 mg/L~80000 mg/L with Ca2+under 5000 mg/L and 20 °C~60 °C respectively. Finally, anti-shearing and oil displacement experiment are carried out under laboratory conditions. The results show that the new polymer after being sheared also has the ability to self-assemble and the enhancement in oil recovery obtained in core flow experiment is higher than conventional polymer flooding, which suggests that it has a wide application prospects in tertiary oil recovery.
In order to further enhance oil recovery (EOR) of the high temperature and high salt oil fields by foam flooding, one foaming agent was screened by airflow method. The influence of oil-water and pressure on foamability and stability were evaluated,and oil displacement experiment was also conducted. The results show that CS-1 foaming agent has better foamability and stability than the others under the reservoir conditions (Temperature 110 °C, Salinity 11.52×104 mg/L, Ca2+&Mg2+ 7654 mg/L). The foam stability will be better as the pressure rise or be worse when it met the crude oil. Oil recovery was improved by 4.13% after waterflood and the total recovery is 60.75%.
A new foam fracturing fluid composed of sodium dodecyl sulfate (SDS), fluorocarbon surfactant (FCS-11), viscoelastic surfactant VES is proposed and developed in this paper. The performances of this fracturing fluid were systematically investigated. The experimental results show that this foam fracturing fluid has good shearing resistance, viscoelasticity and stability. And above all, once broken it has no residue and the damage rate is only 10.12%. These advantages give it a wide application prospect in coal bed methane development.
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