Rheological properties of crude oils in Yaregskoye and Yaraktinskoye oil fields

V.N Manzhai,D.A Terre,Clovis Le Grand Monkam Monkam

doi:10.1088/1755-1315/43/1/012018

V.N Manzhai, D.A Terre + Show 1 more

Open Access

https://doi.org/10.1088/1755-1315/43/1/012018

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Abstract

Rotary viscometer tests of crude oil with a high content of resins and asphaltenes (Yaregskoye oil field) and crude oil with high paraffin content (Yaraktinskoye oil field) have been conducted. The typical flow curves for these oil types have been plotted. It has been detected that these oils are non-Newtonian fluids, viscosity of which is dependent on shear rate. Based on Arrhenius-Eyring equation, calculations of viscous flow activation energy and complex structural unit (CSU) sizes have been performed. It has been stated that there is a tenfold reduction in CSU size in asphaltic crude oil with the increase in shear rate in a rotary viscometer, while particle size in paraffinic crude oil does not essentially change under the same hydrodynamic conditions.

Highlights

For the extraction and the pipeline transport of crude oils with anomalous properties, detailed information about the features of its rheological behavior at different shear stresses in a predetermined temperature range is required
The formal rheological Oswald de Ville and Bingham-Shvedova equations describe the dependence of viscosity on the shear rate only, but does not explicitly consider the temperature effect, which, in turn, makes it difficult to understand the physical nature of the processes occurring in the system at the molecular level
As follows from figures 4 and 5, the tangents of curve inclination angles are proportional to the activation energy of viscous flow (Ea), and they increase with increasing shear rate in case of Yarega crude oil, whereas they remain practically constant considering crude oil of Yaraktinskoye oil field

Summary

Introduction

For the extraction and the pipeline transport of crude oils with anomalous properties, detailed information about the features of its rheological behavior at different shear stresses in a predetermined temperature range is required. 2. Materials and Methods Crude oil with high resin and asphaltene content (figure 1) has a pseudoplastic properties (flow index is in the range 0

Results

Conclusion