Wax deposition mechanisms: Is the current description sufficient?

We report for the first time the results from a systematic investigation of how asphaltenes of different polarity affect crystallization and gelation of waxy oils. The more polar asphaltenes were found to be more aromatic in nature and more highly self-aggregated in the solvent. The presence of less polar asphaltenes in the waxy oil reduced wax appearance temperature and wax precipitation to a greater degree compared to more polar asphaltenes, which was mainly attributed to the difference in the aggregation state of asphaltene of different polarity. Reducing the polarity of asphaltenes present in the oil also resulted in lower gelation temperature, lower storage modulus, and lower yield stress, which was probably because the less polar asphaltenes were more similar to paraffin on the molecular level and thus more readily to interact with wax. Notably, a 99% reduction in yield stress was observed upon the addition of the least polar asphaltenes examined in the present work, in contrast to the 62% yield str...

Influence of Asphaltene Polarity on Crystallization and Gelation of Waxy Oils

Asphaltenes, as the most polar component of crude oils, may interact with wax molecules during the wax crystallization, thus changing wax precipitation characteristics and wax crystal structure and affecting the gelation behavior of crude oils. In the present work, waxy model oils of variable asphaltene contents (0–0.20 wt %) were prepared in order to systematically examine the effect of asphaltenes on the wax precipitation characteristics and the gelation behavior of waxy oils and to look into the structure and the surface electrical properties of wax crystals formed in oils of different asphaltene contents. By means of differential scanning calorimetry and multiple rheometries, it was found that asphaltenes play a significant role in inhibiting the precipitation of wax crystals and delaying the gelation, as well as in weakening the strength of the gel structure. It was observed by polarized optical microscopy that as the asphaltene content increases, the size of wax crystals gradually decreases, and the...

Effect of Asphaltenes on the Structure and Surface Properties of Wax Crystals in Waxy Oils

Exploring ways to efficiently and inexpensively exploit and transport high-viscosity and high-pour-point crude oil is very important, and use of silica nanoparticles (nano-SiO2) to reduce the pour ...

Synthesis and Performance Evaluation of a Nanocomposite Pour-Point Depressant and Viscosity Reducer for High-Pour-Point Heavy Oil

Reducing viscosity of waxy crude oil with electric field perpendicular to oil’s flow direction

Influence of asphaltenes on the performance of electrical treatment of waxy oils

Study on microstructure and compressive properties of Fe-C-W-Cr-V-Nb coating with boron addition

The present invention provides a device and a method for improving and measuring liquid flowability The device comprises a liquid storage device, an electric field treating device, a temperature control device, a metering device and an insulating stand, wherein the liquid storage device comprises a liquid storage room, an insulating cover plate for sealing the liquid storage room is arranged on the opening end of the liquid storage room, and a pressurizing hole and a pressure releasing hole are formed in the insulating cover plate; the electric field treating device comprises a round insulating pipe, a round electrode plate with holes, and a high voltage power supply; the round insulating pipe is connected with the liquid storage room by an opening hole in the center of the bottom surface of the liquid storage room; an outlet valve is arranged at the upper part of the round insulating pipe; the round electrode plate with the holes is closely fixed in the round insulating pipe, is perpendicular to the axial direction of the round insulating pipe, and is connected with the high voltage power supply by an electric wire; the insulating stand is used for supporting the liquid storage device, the electric field treating device, the temperature control device and the metering device

Device and method for improving and measuring liquid flowability

The utility model provides a device for improving and measure liquid flow mobility, the device includes: stock solution equipment, electric field treatment facility, temperature control equipment, nitrogen gas pressurized equipment, measuring equipment and insulation support, wherein, stock solution equipment includes the stock solution room, and its open end is provided with the insulation cover plate who is used for sealed this stock solution room, and is equipped with pressurization hole and pressure release hole on this insulation cover plate, the electric field treatment facility includes insulating pipe, foraminiferous circular plate electrode and high voltage power supply, and this insulation pipe passes through trompil that stock solution room bottom surface center department set up with the stock solution room links to each other, and the upper portion of this insulation pipe is provided with the outlet valve, in foraminiferous circular plate electrode closely is fixed in insulating pipe, and this foraminiferous circular plate electrode perpendicular to the axial of insulating pipe, and its through the electric wire with high voltage power supply links to each other, insulation support is used for supporting stock solution equipment, electric field treatment facility, temperature control equipment and measuring equipment

A device for improving and measure liquid flow mobility

The invention provides a comprehensive treatment method for lowering pour point and viscosity of an easily-congealable and high-viscosity oil product. The method comprises the following steps that (1) after a pour point reducer is added into the easily-congealable and high-viscosity oil product, the easily-congealable and high-viscosity oil product is subjected to heat treatment, and an agent-added oil product A is obtained; (2) the agent-added oil product A is subjected to high-speed shearing and stirring, and an oil product B subjected to high-speed shearing and stirring is obtained; and (3) an electric field with a certain intensity is applied to the oil product B so as to lower the pour point and viscosity of the easily-congealable and high-viscosity oil product simultaneously. The method provided by the invention is low in energy consumption, and can lower pour point and viscosity of the oil product simultaneously, thereby improving the flowing capacity of the oil product at low temperature.

Comprehensive treatment method for lowering pour point and viscosity of easily-congealable and high-viscosity oil product

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