This research article deals with the effect of thermal conditions on the size and morphology of waxy crystals in the Indian crude oil and their influence on the rheological property at different temperatures. The effect of concentrations of flow improvers on the rheology of waxy crude oil has also been studied. Two commercial pour point depressants are used to show the effect of additives on waxy crude oils.The images of wax crystals are taken at various temperatures for both virgin and additivetreated crude oil. Both temperature and additive treatment affect the size and morphology of crystals. Wax crystals have little influence on the rheological properties of the oil at high temperature because the sample is a dilute suspension at this temperature. As the sample was cooled to lower temperature, more wax crystals appeared, with very little agglomeration at first. These crystals were also increasing in size. Due to the wax crystals, the oil acts as a dispersive suspension. Agglomeration between particles becomes common and a lattice is formed and all neighboring agglomerates appear to be connected to each other. The network between wax crystals can be more clearly observed at lower temperatures. The waxy structure at this temperature is more likely to be a porous medium with a continuous phase of solid wax and a dispersed phase of oil base. In case of additivetreated crude oil, wax crystals do not agglomerate even at lower temperatures, which shows that treated crude oils are both pumpable and flowable at even low temperatures which is not the case in neat crude oil. Also, from rheological studies it is shown that additive-treated crude oil require less shear stress i.e less power consumption for transportation.
Study of Wax Inhibition in the Indian Waxy Crude Oil by Polarizing Microscope and its Effect on Rheology
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This research article deals with the effect of thermal conditions on the size and morphology of waxy crystals in the Indian crude oil and their influence on the rheological property at different temperatures. The effect of concentrations of flow improvers on the rheology of waxy crude oil has also been studied. Two commercial pour point depressants are used to show the effect of additives on waxy crude oils.The images of wax crystals are taken at various temperatures for both virgin and additivetreated crude oil. Both temperature and additive treatment affect the size and morphology of crystals. Wax crystals have little influence on the rheological properties of the oil at high temperature because the sample is a dilute suspension at this temperature. As the sample was cooled to lower temperature, more wax crystals appeared, with very little agglomeration at first. These crystals were also increasing in size. Due to the wax crystals, the oil acts as a dispersive suspension. Agglomeration between particles becomes common and a lattice is formed and all neighboring agglomerates appear to be connected to each other. The network between wax crystals can be more clearly observed at lower temperatures. The waxy structure at this temperature is more likely to be a porous medium with a continuous phase of solid wax and a dispersed phase of oil base. In case of additivetreated crude oil, wax crystals do not agglomerate even at lower temperatures, which shows that treated crude oils are both pumpable and flowable at even low temperatures which is not the case in neat crude oil. Also, from rheological studies it is shown that additive-treated crude oil require less shear stress i.e less power consumption for transportation.
Publication Mode |
Online |
---|---|
Publication Author |
Shivanjali Sharma, Vikas Mahto, V. P. Sharma |
Publication Language |
English |
Publication Type |
Conference Paper |
Publication Year |
2016 |
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