Relationship Between the Shear Effect of the Flowability and Composition of Typical Crude Oils

doi:10.11885/j.issn.1674-5086.2019.04.21.01

Abstract

Abstract: In order to reveal the intrinsic effect mechanism of shear (including strong pump shear and weak pipeline shear) on the flowability of the crude oil modified with pour point depressant, and to provide decision-making basis for new pipeline construction and pipeline safe operation, crude oil components, wax structure and wax crystal morphology of the five kinds of crude oil are analyzed by GC, ¹H-NMR, DSC and polarization microscope and effect of pump strong shear and pipeline weak shear on the flowability of the five kinds of crude oil modified with pour point depressant are evaluated by the simulation experimental method reported. It is found that only a very small amount of wax crystals precipitate from the crude oil above the wax appearance temperature, the shear has little effect on the wax crystal structure and does not influence the flowability of the crude oil modified with pour point depressant. In the range of the wax appearance peak temperature, there are a large number of wax crystals in crude oil, the strong pump shear can deteriorate the flowability of the crude oil modified with pour point depressant, and deterioration degree is related to the crude oil composition (wax content, resin content, asphaltene content) and wax structure (carbon number distribution of wax, branched-chain degree of wax); the weak pipeline shear can improve the flowability of some crude oil but also can deteriorate the flowability of other crude oil, which is related to crude oil composition and wax structure. The main reason for the above-mentioned phenomenon is that the shear has a great influence on the wax crystal structure and the wax crystal growth at the wax appearance temperature range.

Key words: pump strong shear, pipeline weak shear, flowability, wax-appearing temperature, wax-appearing peak temperature, high-carbon wax, branched-chain degree

CLC Number:

TE832.3

ZHANG Fusheng, SHAN Dalong, LI Xuening, LIU Guoliang, ZHU Zhuoyan. Relationship Between the Shear Effect of the Flowability and Composition of Typical Crude Oils[J]. 西南石油大学学报(自然科学版), 2020, 42(3): 179-186.

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