Thixotropic Rheological Behavior of Maya Crude Oil

Mortazavi-Manesh, Sepideh; Shaw, John M.

doi:10.1021/ef4022637

Cited by 61 publications

(61 citation statements)

References 33 publications

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“…The lowest concentration tested (10 mg/l) generates average reductions in viscosity of roughly 3%. The increasing shear rate slightly decreases the DVR benefit, which is mainly due to a change in the internal structure of the fluid (Ghannam et al, 2012;Mortazavi-Manesh and Shaw, 2014) that causes a decrease in viscosity. For this reason, the oil viscosity without NPs is lower than at low shear rates, and although the NPs have an effect at any shear rate, its performance is slightly lower.…”

Section: Resultsmentioning

confidence: 99%

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RETRACTED: Striking behavior of the rheology in heavy crude oils by adding nanoparticles

Taborda

Franco

Ruiz

et al. 2017

Adsorption Science & Technology

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The main objective of this paper is to provide unexpected experimental evidence of heavy oil and extra-heavy crude oils viscosity reduction resulting from the presence of nanoparticles of different chemical natures (SiO 2 , Fe 3 O 4 , and Al 2 O 3), surface acidity, and concentration at low-volume fractions. The viscosity of the enhanced fluids was measured using a rotational rheometer at shear rates varying between 1 and 75 s À1. Upon addition of nanoparticles viscosity reduction was observed in all cases evaluated. However, the maximum viscosity reduction of roughly 52% was obtained at a concentration of 1000 mg/l with 7 nm SiO 2 nanoparticles at low shear rate, below 10 s À1 , contrary to expectations from Einstein's viscosity theory in particulate systems. A mathematical model based on a modification to Pal and Rhodes Model for viscosity of suspensions is proposed in this work. The said model was validated successfully using experimental data, as evidenced by root-mean-square error values lower than 10%. The importance of our findings lies in the lack of prior experimental and theoretical data in the open literature showing heavy crude oils viscosity reduction in the presence of nanoparticles.

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Section: Resultsmentioning

confidence: 99%

“…The solvation constant (K) decreases as the shear rate increases, due to an increase in the fluidity of crude oil as its rheological behavior is pseudo-plastic or shear thinning (Kee et al, 1988;Mortazavi-Manesh and Shaw, 2014). The shape factor V depends significantly on the geometric shape of asphaltene-NP.…”

Section: Resultsmentioning

confidence: 99%

RETRACTED: Striking behavior of the rheology in heavy crude oils by adding nanoparticles

Taborda

Franco

Ruiz

et al. 2017

Adsorption Science & Technology

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“…Hysteresis loop tests were carried out to evaluate the viscosity reduction durability over time after the addition of the carrier fluid and nanofluid. According to Mortazavi-Manesh and Shaw [60], the hysteresis flow curves demonstrates thixotropic behavior in the evaluated fluids, which is related with its internal structure breakage and build-up loop and further stability or susceptibility to stress changes.…”

Section: Hysteresis Loop Testsmentioning

confidence: 94%

Development of Nanofluids for Perdurability in Viscosity Reduction of Extra-Heavy Oils

Montes

Orozco²,

Taborda

et al. 2019

Energies

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The primary objective of this study is the development of nanofluids based on different diluent/dispersant ratios (DDR) for extra-heavy oil (EHO) viscosity reduction and its perdurability over time. Different diluents such as xylene, diesel, n-pentane, and n-heptane were evaluated for the formulation of the carrier fluid. Instability of asphaltenes was assessed for all diluents through colloidal instability index (CII) and Oliensis tests. Rheology measurements and hysteresis loop tests were performed using a rotational rheometer at 30 °C. The CII values for the alkanes type diluents were around 0.57, results that were corroborated with the Oliensis tests as asphaltenes precipitation was observed with the use of these diluents. This data was related to the viscosity reduction degree (VRD) reported for the different diluents. With the use of the alkanes, the VRD does not surpass the 60%, while with the use of xylene a VRD of approximately 85% was achieved. Dimethylformamide was used as a dispersant of the nanoparticles and had a similar VRD than that for xylene (87%). Subsequent experiments were performed varying the DDR (xylene/dimethylformamide) for different dosages up to 7 vol % determining that a DDR = 0.2 and a dosage of 5 vol % was appropriated for enhancing EHO VRD, obtaining a final value of 89%. Different SiO2 nanoparticles were evaluated in the viscosity reduction tests reporting the best results using 9 nm nanoparticles that were then included at 1000 mg·L−1 in the carrier fluid, increasing the VRD up to 4% and enhancing the perdurability based on the rheological hysteresis and the viscosity measurements for 30 days. Results showed a viscosity increase of 20 and 80% for the crude oil with the nanofluid and the carrier fluid after 30 days, respectively. The nanoparticles have a synergistic effect in the viscosity reduction and the inhibition of the viscoelastic network re-organization (perdurability) after treatment application which was also observed in the rheological modeling carried out with Cross and Carreau models as the reported characteristic relaxation time was increased almost a 20%. Moreover, the Vipulanandan rheological model denotes a higher maximum stress value reached by the EHO with the addition of nanofluids which is derived from the EHO internal structure rearrangement caused by the asphaltenes adsorption phenomenon.

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“…The thixotropic characteristic can be identified and measured by the transient stress techniques such as hysteresis loop and creep experiment. The study of Mortazavi-Manesh and Shaw (2014) shows that the magnitude of thixotropic characteristic of the Maya crude oil become larger as the temperature decreased, and the relationship between thixotropy and temperature can be expressed by the hysteresis loop area and the stress decay. By studying the apparent viscosity of thixotropic liquid, Escudier and Presti (1996) concluded that the apparent viscosity in pipe flow is far from structural equilibrium and always lower than the corresponding value obtained from the rheometer.…”

Section: Introductionmentioning

confidence: 99%

A Study on Flow Characteristics of Heavy Crude Oil for Pipeline Transportation

Zhang¹,

Xu²,

Chen³

2015

Petroleum Science and Technology

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In this work, the flow characteristics of heavy crude oil were investigated by using a rheometer and a lab scale flow loop, respectively. In the experiments of rheometer, there is an approximate linear relationship between the yield stress and the area of thixotropic loop independent to the system temperature and crude oil types. A comparison between the experimental data of yield stress versus start-up rate obtained in the pipe start-up flow with those measured in the rheometer reveals that the transport characteristics of heavy crude oil can be predicted well by the rheological measurements.

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Thixotropic Rheological Behavior of Maya Crude Oil

Cited by 61 publications

References 33 publications

RETRACTED: Striking behavior of the rheology in heavy crude oils by adding nanoparticles

RETRACTED: Striking behavior of the rheology in heavy crude oils by adding nanoparticles

Development of Nanofluids for Perdurability in Viscosity Reduction of Extra-Heavy Oils

A Study on Flow Characteristics of Heavy Crude Oil for Pipeline Transportation

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