Optimization of Wax deposition in a Sub-Cooled pipeline using Response Surface Methodology
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Date
2015-08-05
Authors
Adeyanju, O.
Oyekunle, L.
Journal Title
Journal ISSN
Volume Title
Publisher
Society of Petroleum Engineers
Abstract
Key factors affecting wax deposition in sub-cooled pipelines (wall (coolant) temperature (A), inlet oil temperature
(B), and the percentage of wax inhibitors in the crude (C), and oil flow rate (D)) were experimental studied using
the fabricated flow loop rig designed to simulate the flow of relatively higher temperature crude oil in sub-cooled
pipeline.
In an effort to investigate the possibility of minimizing the wax deposits volume in a flow of crude oil in sub-cooled
pipeline, response surface methodology (RSM) was used to evaluate the individual and interactive effects of four
variables affecting the wax deposits process using central composite design (CCD). It was observed that for the
crude oil samples the experimental data highly fitted to the predicted data because of the predicted R-squares is
in reasonable agreement with the adjusted R-square.
In the laminar-turbulent transition flow regimes (2000 < Reynolds number (Re) > 3000), A, B, C, D,AB, AC, BC,
A2, B2, and C2 are significant, as their individual P-value were less than 0.05 by each of the term, while AD, BD,CD and D , are insignificant as their P-values were more than 0.05. While in the laminar flow regime (Re < 2000)
the results were similar to that observed in the turbulent flow regime except the flow rate term, (D) which was
insignificant (with P-values of more than 0.05) due to insignificant effect of shear dispersion and removal in the
laminar flow regime.
In applying the response surface methodology central composite design (RSMCCD) in the Minitab-16 software to
minimized wax deposit in crude oil flow in sub-cooled pipeline wax deposits were reduced to 64cm in the laminar
flow regime and 43cm in the laminar-turbulent transition flow region. The small error percentage between the
predicted and actual volume of wax deposit (4.68% in the laminar and 4.55% in the laminar-turbulent transition
flow regime: indicated that the software models were valid and accurate in representing the actual experimental
values and also in predicting the inhibition of wax deposit within the range studied.
Description
Staff publications
Keywords
Interactive effect , Error percentage , Laminar-turbulent transition flow , Significant influence , Sub-cooled pipeline , Research Subject Categories::TECHNOLOGY::Chemical engineering
Citation
Adeyanju, O.A. and Oyekunle, L.O. (2015). Optimization of Wax deposition in a Sub-Cooled pipeline using Response Surface Methodology.