Irreversible time dependence of gelled waxy crude oils: Flow experiments and modeling

2020 ◽  
Vol 64 (5) ◽  
pp. 1237-1250 ◽  
Author(s):  
Behbood Abedi ◽  
Elias C. Rodrigues ◽  
Paulo R. de Souza Mendes
Keyword(s):  
Time Dependence ◽  
Crude Oils ◽  
Waxy Crude ◽  
Waxy Crude Oils ◽  
Flow Experiments

IMMISCIBLE DISPLACEMENT OF VISCOPLASTIC WAXY CRUDE OILS: A NUMERICAL STUDY

2017 ◽  
Vol 20 (5) ◽  
pp. 417-433 ◽  
Author(s):  
Ali Salehi-Shabestari ◽  
Mehrdad Raisee ◽  
Kayvan Sadeghy
Keyword(s):  
Numerical Study ◽  
Crude Oils ◽  
Immiscible Displacement ◽  
Waxy Crude ◽  
Waxy Crude Oils

scholarly journals Study of linseed oil, its biodiesel and xylene as flow improver for Nigerian waxy crude oils

2021 ◽  
Author(s):  
Ogunkunle Temitope Fred ◽  
Abraham Victoria Damilola ◽  
Adebisi Abimbola Ashonibare ◽  
Rukayat Adenike ◽  
Tega-oboh Elohor Sylvia
Keyword(s):  
Linseed Oil ◽  
Crude Oils ◽  
Waxy Crude ◽  
Waxy Crude Oils ◽  
Flow Improver

scholarly journals THE ELASTO-VISCOPLASTIC-TIME-DEPENDENT NATURE OF WAXY CRUDE OILS

2014 ◽  
Vol 13 (2) ◽  
pp. 16
Author(s):  
B. A. Tarcha ◽  
B. P. P. Forte ◽  
E. J. Soares ◽  
R. L. Thompson
Keyword(s):  
Yield Stress ◽  
Crude Oils ◽  
Time Dependency ◽  
Gelation Temperature ◽  
Viscous Effects ◽  
Waxy Crude Oil ◽  
Waxy Crude ◽  
Crucial Feature ◽  
Waxy Crude Oils

Production in reservoirs located in deep and ultra-deep water that contain waxy crude oils faces a huge obstacle imposed by the low temperatures of the environment. When the waxy crude oil is subjected to a temperature below the Gelation Temperature, as in the case investigated in the present work, it exhibits a variety of non-Newtonian features: elasticity, plasticity, viscous effects, and time-dependency, which renders to this material a highly complex behavior. A crucial feature that is frequently ignored when the determination of the yield stress is being carried out is the timedependency nature of these materials. We demonstrate that this character has a significant impact on the measurement of the yield stress and, therefore, values obtained from a protocol that neglects time-dependency can be substantially different from a more careful procedure.

Rheology of Waxy Crude Oils

1988 ◽  
Author(s):  
L.T. Wardhaugh ◽  
D.V. Boger ◽  
S.P. Tonner
Keyword(s):  
Crude Oils ◽  
Waxy Crude ◽  
Waxy Crude Oils

scholarly journals A Survey on Mathematical Modelling of Deposition in Waxy Crude Oils

2011 ◽  
Vol 6 (5) ◽  
pp. 157-183 ◽  
Author(s):  
A. Fasano ◽  
L. Fusi ◽  
S. Correra ◽  
M. Margarone
Keyword(s):  
Mathematical Modelling ◽  
Crude Oils ◽  
Waxy Crude ◽  
Waxy Crude Oils

Experimental Investigation of Rheological Behaviors and Flow Improving by Chemical for Waxy Crude Oils

2006 ◽  
Author(s):  
Jiaqiang Jing ◽  
Zhongyuan Guan ◽  
Xiaoqin Xiong ◽  
Hua Tian ◽  
Liwen Tan
Keyword(s):  
Structure Formation ◽  
Pour Point ◽  
Viscosity Reduction ◽  
Crude Oils ◽  
Polarization Microscopy ◽  
Rheological Behaviors ◽  
Waxy Crude ◽  
Waxy Crude Oils ◽  
Flow Improver ◽  
Wax Crystals

It has been proved that the flow improver makes the transportation of waxy crude oils in pipeline much more economic and safe, but so far an universal flow improver for various waxy crude oils has not been found because of inadequately understanding the action mechanism of the flow improvers. Therefore it is necessary for the mechanism to be studied further. A series of synthetic waxy oils (SWOs) with or without flow improver GY1, a long chain alkyl acrylate polymer based chemical, are prepared from 25# transformer oil, 50#, 60# (macrocrystalline) and 80# (microcrystalline) wax, single or mixed, and in some cases 60# road asphalt by mixing the ingredients at 100°C for 1 hour. Characteristic temperatures, viscosity-temperature properties and rheological behaviors are studied by using rheological techniques, and microstructures of wax crystals grown from SWOs at 20 °C are analyzed by using a polarization microscopy. Some abnormal viscosity-temperature properties of SWOs are found, which mainly results from wax crystallization and network structure formed by wax crystals. The mechanisms involved in the structure formation and fluidity improved by chemical for SWOs are discussed here. Studies show that the structure formation is followed by the formation of crystal nuclei, growth and interconnection or bridging of the wax crystal particles, which is closely relevant to wax molecular dimension and content, crystalline particle size, shape, concentration and surface characteristics. GY1 added into the SWOs lowers their cloud points by 0–2.0 °C and enhances the amounts of wax precipitated at 30 °C by 10–35wt%, which might not be involved in the mechanisms of the fluidity improving under this study. The extent of pour point depression by GY1 increases with increasing the wax molecular size and decreasing the wax content in the SWOs. As long as the SWO treated by GY1 has a greater yield stress reduction at the temperature closed to its pour point, its viscosity and pour point reduction will be more obvious. The common shortcut of pour point depression and viscosity reduction is to inhibit or desintegrate the formation of paraffin crystal network. The mechanisms involved in fluidity improvement of waxy crude oils by chemicals include modifying surface properties of waxy crystals and promoting crystal particle growth with higher symmetry.

The reduction of wax precipitation in waxy crude oils by Pseudomonas species

2008 ◽  
Vol 35 (11) ◽  
pp. 1241-1245 ◽  
Author(s):  
A. Etoumi ◽  
I. El Musrati ◽  
B. El Gammoudi ◽  
M. El Behlil
Keyword(s):  
Crude Oils ◽  
Wax Precipitation ◽  
Waxy Crude ◽  
Pseudomonas Species ◽  
Waxy Crude Oils
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