Evaluation of Measurement Methods of Waxy Crude Oil Thixotropy

Wang, Yanting; Huang, Qiyu

doi:10.1080/01932691.2013.838781

Cited by 3 publications

(2 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this description, the yield stress can vary from a low value, corresponding to a fully destructured fluid, to a high value, for a fully structured material. In that case, the parameter determination is done by rheometry, exploring different shear values and structure parameter evolutions [see Cawkwell and Charles (1989), H enaut and Brucy (2001), and Wang and Huang (2014)], sometimes with a new version of the model involving more parameters [Ding et al (2006)]. However, in the literature, one can hardly find a discussion of the quality of this model to describe the effective rheological behavior of such materials obtained from careful and systematic rheometrical data.…”

Section: Introductionmentioning

confidence: 99%

Modeling the rheological behavior of waxy crude oils as a function of flow and temperature history

Mendes¹,

Vinay²,

Ovarlez³

et al. 2015

Journal of Rheology

View full text Add to dashboard Cite

International audienceSynopsis The solidification of waxy components during the cool down of waxy crude oils in pipelines may provide complex yield stress fluid behavior with time-dependent characteristics, which has a critical impact for predicting flow restart after pipeline shut-in. Here, from a previous set of data at a local scale with the help of Magnetic Resonance Imaging and a new full set of data for various flow and temperature histories, we give a general picture of the rheological behavior of waxy crude oils. The tests include start flow tests at different velocities or creep tests at different stress levels, abrupt changes of velocity level, steady flow, after cooling under static or flowing conditions. We show that when the fluid has been cooled at rest it forms a structure that irreversibly collapses during the startup flow. Under these conditions, the evolution of the apparent viscosity mainly depends on the deformation undergone by the fluid for low or moderate deformation and starts to significantly depend on the shear rate for larger values. Even the (apparent) flow curve of statically cooled waxy crude oils was observed to be dependent on the flow history, more specifically on the maximum shear rate experienced by the material. After being sufficiently sheared, i.e., achieving an equilibrium state, the rheological behavior is that of a simple liquid for shear rates lower than the maximum historical one. A model is proposed to represent those trends experimentally observed. In contrast with most previous works in that field, the model is built without any a priori assumption based on classical behavior of a class of fluids. Finally, it is shown that this mode

show abstract

Section: Introductionmentioning

confidence: 99%

Modeling the rheological behavior of waxy crude oils as a function of flow and temperature history

Mendes¹,

Vinay²,

Ovarlez³

et al. 2015

Journal of Rheology

View full text Add to dashboard Cite

show abstract

“…Hysteresis loops are used to investigate the thixotropy of micelle solutions. The larger the hysteresis loop area, the greater the energy required to destroy the structure and the longer the time required for the structure to recover, so the internal structure is stronger (Guo et al, 2015; Wang & Huang, 2014). Figure 3 shows the shear thixotropy of TOCC/NaSal micelle solutions, the uplines and downlines almost overlap at low salt concentrations (0.0 and 0.2 wt%), and no significant thixotropy is present in the micelle solution, indicating a weak internal structure.…”

Section: Resultsmentioning

confidence: 99%

Rheology on novel viscoelastic trimeric octadecyl zwitterionic surfactant micelle solutions

Han

Fang

et al. 2023

J Surfact & Detergents

View full text Add to dashboard Cite

In this work, a novel trimeric octadecyl zwitterionic surfactant (TOCC) was successfully synthesized. TOCC was compounded with sodium salicylate (NaSal) for an optimized formulation to form viscoelastic micelles. The effects of NaSal concentration, pH, and temperature on the rheological properties of TOCC and TOCC/NaSal micelle solutions were investigated. The flow curves for both TOCC and TOCC/NaSal micelle solutions can be fitted with the Carreau–Yasuda model. Zero shear viscosity of TOCC/NaSal micelle solution increased and then decreased with increasing NaSal concentration, and the same trend was observed for viscoelasticity. Some micelle solutions exhibited significant thixotropy with stress overshoot. The optimal composition of the TOCC/NaSal micelle solution obtained was 5.0/0.5 wt%. Frequency sweep in the form of Cole–Cole plots indicated that the viscoelastic modulus of the TOCC/NaSal micelle solution fitted the Maxwell model at low and medium frequencies. With increasing pH, 5.0 wt% TOCC micelle solution had the maximum zero shear viscosity at pH = 6.9. The steady‐state viscosities of different concentrations of TOCC micelle solutions reached their maximum at neutral conditions (pH = 6.5 ~ 7.0). Viscoelastic modulus of 5.0 wt% TOCC and TOCC/NaSal (5.0/0.5 wt%) micelle solutions decreased with increasing temperature, and thermal thixotropy was observed in both micelle solutions. The novel TOCC and TOCC/NaSal micelle solutions enrich the variety of trimeric surfactants and viscoelastic micelle solutions. This study provides a rheological reference for the applications of viscoelastic trimeric surfactants in smart materials and oil fields.

show abstract

Regulation rule of cellulose nanocrystals on thixotropy of hydrogel for water shutoff in horizontal wells

Huang

et al. 2022

Colloids and Surfaces A: Physicochemical and Engineering Aspect

View full text Add to dashboard Cite

Evaluation of Measurement Methods of Waxy Crude Oil Thixotropy

Cited by 3 publications

References 18 publications

Modeling the rheological behavior of waxy crude oils as a function of flow and temperature history

Modeling the rheological behavior of waxy crude oils as a function of flow and temperature history

Rheology on novel viscoelastic trimeric octadecyl zwitterionic surfactant micelle solutions

Regulation rule of cellulose nanocrystals on thixotropy of hydrogel for water shutoff in horizontal wells

Contact Info

Product

Resources

About