eprintid: 5010
rev_number: 2
eprint_status: archive
userid: 1
dir: disk0/00/00/50/10
datestamp: 2023-11-09 16:16:43
lastmod: 2023-11-09 16:16:43
status_changed: 2023-11-09 16:00:15
type: article
metadata_visibility: show
creators_name: Chala, G.T.
creators_name: Sulaiman, S.A.
creators_name: Japper-Jaafar, A.
creators_name: Kamil Wan Abdullah, W.A.
creators_name: Mior Mokhtar, M.M.
title: Gas void formation in statically cooled waxy crude oil
ispublished: pub
keywords: Cooling; Crude oil; Gelation; Magnetic resonance imaging; Yield stress, Circular pipe; Conventional methods; Cooling rates; Cooling temperature; South China sea; Thermal shrinkage; Void formation; Waxy Crude Oil, Gases
note: cited By 31
abstract: If a gel is formed when the flow of waxy crude oil within a pipeline is stopped for a period of time, the required restart pressure may be high and the line is costly to operate. The conventional method of predicting the restart pressure for gelled crude oil assumes a constant yield stress across and along the pipe section; this often leads to excessive over sizing of pump and piping system. Many researches highlighted that the presence of gas voids upon cooling of waxy crude may have an impact on the yield stress of gelled crude. This paper describes the use of Magnetic Resonance Imaging (MRI) to investigate the formation behaviour of gas voids within a gelled crude oil sample from a field in the South China Sea. Scanning of gelled crude at selected temperatures was performed following cooling in the circular pipe section within an experimental flow loop rig. Gas voids within the range of 7-12 were observed in the gelled samples resulted from different cooling temperatures and cooling rates. The cooling temperature and cooling rates were observed to influence significantly the location and volume of gas voids formed within the gelled samples. Higher cooling rates resulted in higher volume of gas voids close to pipe wall while lower cooling rates resulted in more gas voids located around core of the pipe. © 2014 Elsevier Masson SAS. All rights reserved.
date: 2014
publisher: Elsevier Masson SAS
official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84905582467&doi=10.1016%2fj.ijthermalsci.2014.06.034&partnerID=40&md5=67ae821045aa7ed2800952be5862e846
id_number: 10.1016/j.ijthermalsci.2014.06.034
full_text_status: none
publication: International Journal of Thermal Sciences
volume: 86
pagerange: 41-47
refereed: TRUE
issn: 12900729
citation:   Chala, G.T. and Sulaiman, S.A. and Japper-Jaafar, A. and Kamil Wan Abdullah, W.A. and Mior Mokhtar, M.M.  (2014) Gas void formation in statically cooled waxy crude oil.  International Journal of Thermal Sciences, 86.  pp. 41-47.  ISSN 12900729