Shear strengthening viscosity and shear-rate-dependent modulus model for a Shengli crude oil

Huang, Shuxin; Zou, Ying; Chen, Xin; Wu, Wenxiang

doi:10.1080/10916466.2017.1347681

Cited by 6 publications

(3 citation statements)

References 14 publications

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“…Pour point is a parameter usually used for assessing the flowability of crude oil. It is the lowest temperature at which the fluidity of crude oil is retained . The cold finger test is used for determining the amount of wax deposited by maintaining a temperature gradient.…”

Section: Introductionmentioning

confidence: 99%

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Chemical Additives as Flow Improvers for Waxy Crude Oil and Model Oil: A Critical Review Analyzing Structure–Efficacy Relationships

et al. 2022

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Waxy crude oil has become a crucial unconventional oil alternative owing to the depleting conventional oil resources. However, ascertaining flow assurance in a waxy crude oil pipeline at low temperatures is challenging due to the high viscosity and gelation properties of waxy crude oil and wax deposition on the pipeline wall. Researchers and industries use different classes of chemical additives to resolve the flow assurance issues. The current review aims to build a relationship between the structural properties of chemical additives and their flow improvement efficacy. A wide array of compounds reported in the past decade has been critically examined to understand the progress in the field. Polymers form a bulk of these compounds. However, there is a shift toward polymer nanocomposites owing to their better effect compared to pure polymers. Surfactants, organic solvents, and other molecules have also been utilized as additives to ensure flow during waxy crude oil transportation. The presence of different structural properties such as alkyl chain length, aromatic rings, size of aromatic rings, polar groups, and others have been related to their effect on the flowability of waxy crude oil. Moreover, the factors related to scaling of lab-scale results to industry level have been enumerated. The future directions and perspectives related to utilizing structure–efficacy relationships of chemical additives have been discussed. In contrast to the existing literature, special importance has been given to the chemical structures of additives and their molecular interactions with waxy oils. The perspective of the structure–efficacy relationship will help in designing novel additives with greater efficacy and suitability for waxy crude oil.

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Section: Introductionmentioning

confidence: 99%

“…It is the lowest temperature at which the fluidity of crude oil is retained. 47 The cold finger test is used for determining the amount of wax deposited by maintaining a temperature gradient. The oil is placed at a temperature above WAT, and a steel rod is dipped into the oil at a temperature below WAT.…”

Section: Introductionmentioning

confidence: 99%

Chemical Additives as Flow Improvers for Waxy Crude Oil and Model Oil: A Critical Review Analyzing Structure–Efficacy Relationships

et al. 2022

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“…They found that for crystallization under a cooling rate of 1.5 °C/min, shear decreased the crystal size, but increased the box-counting fractal dimension. Furthermore, some scholars have studied the effect of shear on the microstructure of wax crystals by rheological measurements. − …”

Section: Introductionmentioning

confidence: 99%

New Approach for the In Situ Microscopic Observation of Wax Crystals in Waxy Crude Oil during Quiescent and Dynamic Cooling

Zhao

Dong

et al. 2020

ACS Omega

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The purpose of this attempt is to present a new investigation approach to achieve the in situ observation of the microscopic structure and morphology of wax crystals under quiescent and shear conditions. The rheo-microscopy simultaneous measurement system of a rheometer is employed to ensure in situ observation. A multi-angle composite light source is created to obtain a high-quality image. It is demonstrated that the new approach can achieve a better identification and distinction of wax crystals, as well as the outstanding wax boundary delineation. Based on this, some new findings related to the microscopic structure and morphology of wax crystals are elaborated. Additionally, the in situ observations of wax crystals under dynamic cooling at different shear rates are performed. It is noticed from the obtained results that wax crystals and their aggregates exhibit significant stereoscopic structural characters, because of growth of wax crystals and their overlap in 3-D space. Shear can change the morphology of single wax crystals, but hardly destroy the structure or growth. The increase of the shear rate can induce the deformation propensity of wax crystals to flow field. The effect of shear on aggregation of wax crystals depends on the chemical composition and inherent structural properties. Normally, a low rate of shear can promote aggregation, and result in a complicated stereo-structure. Upon increasing the shear rate, two opposite effects simultaneously occur including promotion and inhibition of aggregation. As the shear rate further increases, the destructive effect increases and gradually plays a leading role, causing the wax crystal aggregates exhibit a smaller size and a weaker stereo structure.

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Shear strengthening viscosity of a Shengli crude oil

et al. 2023

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Shear strengthening viscosity and shear-rate-dependent modulus model for a Shengli crude oil

Cited by 6 publications

References 14 publications

Chemical Additives as Flow Improvers for Waxy Crude Oil and Model Oil: A Critical Review Analyzing Structure–Efficacy Relationships

Chemical Additives as Flow Improvers for Waxy Crude Oil and Model Oil: A Critical Review Analyzing Structure–Efficacy Relationships

New Approach for the In Situ Microscopic Observation of Wax Crystals in Waxy Crude Oil during Quiescent and Dynamic Cooling

Shear strengthening viscosity of a Shengli crude oil

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