Waxy oils: Deformation-dependent materials

Legnani, Amanda; Santos, Tainan Gabardo Miranda dos; Andrade, Diogo E. V.; Negrão, Cezar Otaviano Ribeiro

doi:10.1016/j.jnnfm.2020.104378

Cited by 11 publications

(14 citation statements)

References 34 publications

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“…Figure shows the shear stress variation during the shearing process. When the shear rate first started to load, a stress overshoot occurred due to the rheomalaxis behavior of the wax deposit . Once the deformation in the wax deposit has reached its limits, the structure begins to break down, resulting in a rapid decrease in shear stress.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, the faster pigging velocity allows the wax layer to be subjected to a higher shear rate in a shorter time. To the best of our knowledge, wax deposits are also oil-wax gels, which exhibit rheomalaxis elasto-viscoplastic (REVP) behavior. − The term rheomalaxis is defined as the irreversible thixotropy of the material. , The oil-wax gel exhibits viscoelasticity under small deformations and plasticity under large deformations. , Its rheological behavior can be described by the structural kinetics model, which introduces the structural parameter λ to characterize the structural state of the material quantitatively . The yield stress fluid is gradually transformed from the pristine state to the slurry state under shear, corresponding to the structural parameter λ from 1 to 0.…”

Section: Introductionmentioning

confidence: 99%

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A Comprehensive Model for Cup Pig Incorporating Deposits Rheology and Pig Deformation

et al. 2021

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Over the past two decades, mechanical pipeline pigging has been the most common remediation technique to reduce the hazards of wax deposition, but describing pressure changes during the pigging process remains a challenge. In this work, a mathematical model was developed to predict the wax breaking force and the wax removal efficiency of the cup pigs at different pigging velocities. Based on the rheological properties of the wax deposits, static yield stress and dynamic yield stress were used to characterize the strength of the wax layer in different zones. The model prediction results are in good agreement with the results of indoor pigging experiments. In addition, the effect of pigging velocity on the wax breaking force and wax removal efficiency was experimentally investigated. It was shown that the wax breaking force at high velocities was 3–4 times higher than that at low velocities, while the wax removal efficiency decreases as the pigging velocity increases. This experimental phenomenon can be well interpreted by the model prediction results.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Comprehensive Model for Cup Pig Incorporating Deposits Rheology and Pig Deformation

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Different researchers investigated the irreversibility of the material by imposing a maximum shear rate on the material and then returning to a lower shear rate [ 2 , 32 – 34 ]. Mendes et al 2015 observed that the high shear rates imposed on the waxy CO altered its structure irreversibly [ 35 ].…”

Section: Introductionmentioning

confidence: 99%

“…Andrade et al 2020 suggested the development of a specific model to focus on the irreversible circumstance as the macroscopic results of the waxy CO obtained from the conventional rheometers failed to consider the unsheared region [ 33 ]. Legnani et al 2020 investigated the effect of the shear history on the flow of waxy COs and observed that the time-dependent elastoviscoplastic behavior of the waxy CO structure can be irreversibly modified by the shear [ 34 ].…”

Section: Introductionmentioning

confidence: 99%