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- W4310498445 abstract "Pigging technology is frequently employed to minimize the potential risk of wax deposition for the safe operation of subsea pipelines, but a limited understanding of the flow of fractured wax deposits heightens the blockage hazard of mechanical pigging operations and lacks a scientific basis for determining the pigging frequency. In this paper, a series of rheological experiments were carried out by a vane-in-cup geometry, and the flow of fractured wax deposits was uncovered by an in-house pigging apparatus. It was found that slight thixotropy and viscoplasticity dominated the rheological behavior of the fractured wax deposit. In addition, the weak thixotropy, which accounts for the local resistance to wax plug flow, remains constant from plug formation to discharge. The in-house pigging experiments also revealed that the local resistance is only related to the static yield stress of the wax deposit and the pigging speed, both of which are independent variables of the microstructural configuration. Drawing on microstructural changes to quantify the effect of shear history, a physical model was formulated to predict the local resistance to wax plug flow under various pigging conditions. The model predictions deviate within acceptable limits from the experimental matrix and data reported in the literature. In addition, the concept of safe maximum differential pressure was introduced to assess the occurrence of wax plugging accidents as well as to determine the upper threshold of the pigging frequency for subsea pipelines." @default.
- W4310498445 created "2022-12-11" @default.
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- W4310498445 date "2023-01-01" @default.
- W4310498445 modified "2023-09-28" @default.
- W4310498445 title "Continuous flow of fractured wax deposits in subsea pipelines" @default.
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- W4310498445 doi "https://doi.org/10.1016/j.jnnfm.2022.104967" @default.
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