Rheological Degradation of Model Wax-Oil Gels

Paso, Kristofer; Kompalla, Thomas; Oschmann, Hans; Sjöblom, Johan

doi:10.1080/01932690802548924

Cited by 63 publications

(72 citation statements)

References 11 publications

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“…A transition between ''fast'' gel breakdown ''slow'' gel breakdown is observed at a strain regime between 10 1 and 10 2 . The transition may be attributed to the emergence of a viscous contribution to the mechanical response at shear rates larger than 0.1 s À1 , corroborating the results of Paso et al [12] When the shear rate reaches 10 s À1 (corresponding to an absolute strain of $10 4 ), an acceleration event in the structural degradation process is observed, and may be possibly attributed to an increasing effective ratio of imposed stress to yield stress of the fluid. Hence, the structural degradation process is dependent on deformation, shear rate, and the relative ratio between imposed stress and effective yield stress.…”

Section: Temperature-dependent Viscositysupporting

confidence: 79%

Strain-Dependent Rheological Model and Pressure Wave Prediction for Shut in and Restart of Waxy Oil Pipelines

Zhao

Paso

Sariman

et al. 2014

Journal of Dispersion Science and Technology

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Waxy oil gelation and rheology is investigated and modeled using strain-dependent viscosity correlations. Rotational rheometry shows a sharp viscosity increase upon gel formation. High creeping flow viscosities are observed at small deformation conditions prior to yielding. A new strain-dependent rheological model, following analogous formulation to the Carreau-Yasuda shear rate-dependent model, captures viscosity reduction associated with yielding. In addition, shear viscosity and extensional viscosity are investigated using a capillary rheometry method. Distinct shear-thinning behavior is observed in the shear mode of deformation, while distinct tension-thinning behavior is observed in the extensional mode of deformation for the model fluid systems. High Trouton ratios are obtained for the gelled model fluid systems, confirming strongly non-Newtonian fluid rheology. Finally, axial pressure wave profiles are computed at real pipeline dimensions for idealized moderate yield stress fluids using a computationally efficient 1D pipeline simulator. The Rønningsen time-dependent gel degradation model is used to emulate the fluid rheology in the simulator. Axial stress localization phenomena are shown to depend on the overall magnitude of gel degradation as established by the reduction in yield value. A high degree of gel degradation serves to afford flow commencement in a timely manner.

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Section: Temperature-dependent Viscositysupporting

confidence: 79%

Strain-Dependent Rheological Model and Pressure Wave Prediction for Shut in and Restart of Waxy Oil Pipelines

Zhao

Paso

Sariman

et al. 2014

Journal of Dispersion Science and Technology

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“…Similarly, multiple authors have modeled the viscosity of heavy crude as a function of asphaltene content with conventional models derived from Einstein's equation [24,26,29,30,37]. There are models independent of the shear rate, for example, wax-oil gels, which is instead dependent on the strain [38][39][40]. Our previous model [33] describes well the experimental data previously obtained but is dependent on the shear rate at which the viscosity is measured.…”

Section: Introductionsupporting

confidence: 70%

A New Model for Describing the Rheological Behavior of Heavy and Extra Heavy Crude Oils in the Presence of Nanoparticles

et al. 2017

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Abstract:The present work proposes for the first time a mathematical model for describing the rheological behavior of heavy and extra-heavy crude oils in the presence of nanoparticles. This model results from the combination of two existing mathematical models. The first one applies to the rheology of pseudoplastic substances, i.e., the Herschel-Bulkley model. The second one was previously developed by our research group to model the rheology of suspensions, namely the modified Pal and Rhodes model. The proposed model is applied to heavy and extra heavy crude oils in the presence of nanoparticles, considering the effects of nanoparticles concentration and surface chemical nature, temperature, and crude oil type. All the experimental data evaluated exhibited compelling goodness of fitting, and the physical parameters in the model follow correlate well with variations in viscosity. The new model is dependent of share rate and opens new possibilities for phenomenologically understanding viscosity reduction in heavy crude by adding solid nanoparticles and favoring the scale-up in enhanced oil recovery (EOR) and/or improved oil recovery (IOR) process.

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“…The implemented asymptotic limiting value affords consistency of the present rheological model with experimental results at low strain values [26]. It is also reported that, subsequent to gel breakage, the gel strength behaves as a point function of absolute strain (shear history) instead of a point function of time [27,25,28]. Following these known results, the gel viscosity is derived as function of strain and temperature, incorporating an exponential dependency upon strain (c) as well as temperature inverse (H À1 ).…”

Section: Introductionsupporting

confidence: 52%

Numerical study of flow restart in the pipeline filled with weakly compressible waxy crude oil in non-isothermal condition

Kumar

Paso

Sjöblom

2015

Journal of Non-Newtonian Fluid Mechanics

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Rheological Degradation of Model Wax-Oil Gels

Cited by 63 publications

References 11 publications

Strain-Dependent Rheological Model and Pressure Wave Prediction for Shut in and Restart of Waxy Oil Pipelines

Strain-Dependent Rheological Model and Pressure Wave Prediction for Shut in and Restart of Waxy Oil Pipelines

A New Model for Describing the Rheological Behavior of Heavy and Extra Heavy Crude Oils in the Presence of Nanoparticles

Numerical study of flow restart in the pipeline filled with weakly compressible waxy crude oil in non-isothermal condition

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