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MODELING OF FLOW INSTABILITY IN DEEPWATER FLOWLINES AND RISERS: A CASE STUDY OF SUBSEA OIL PRODUCTION FROM CHINGUETTI FIELD, MAURITANIA

TAKEI, JAMALUDIN (2010) MODELING OF FLOW INSTABILITY IN DEEPWATER FLOWLINES AND RISERS: A CASE STUDY OF SUBSEA OIL PRODUCTION FROM CHINGUETTI FIELD, MAURITANIA. Masters thesis, Universiti Teknologi PETRONAS.

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Abstract

Chinguetti a deepwater oil field development offshore Mauritania is experiencing a rapid decline in its production that resulted to severe flow instability or slugging in flowlines and risers of its subsea oil production system. Slugging initiates oscillations and puts field operator in a demanding situation to manage and control flow instability. It is crucial to have a model to describe flow instability issues in live field conditions. Apparently, there is no applicable model to represent flow instability in deepwater operations. Current available data that represents flow instability in flowlines and risers in live field conditions has not been published in any literature. The available data is mostly from laboratory controlled conditions or laboratory scale ideal condition. Model using laboratory conditions has limited capability that cannot be used to assess severity of slugging. A study was undertaken in which integrated production system of the Chinguetti wells, flowlines and risers were developed using the OLGA transient multi phase flow simulator. Field validation was performed by tuning the models to match field pressures and phase flowrates and instability in the systems. The impact of various changes in operating conditions on the flow instability was examined by simulating the models that included changes in well routings, gas lift injection rates and location of injection points, riser and wellhead choke openings. The severity of flow instabilities for the different operating conditions was categorized by the degree of fluctuations in liquid arrival rates and the characteristics of its liquid slugs, length and frequency. Results from field implementation of the recommended changes in operating conditions indicated improvement in flow stability and oil recovery. From the study, a methodology has been developed to assess the severity of slugging and strategies to mitigate flow stability and productivity in the flowlines and risers ofChinguetti oil production system.

Item Type: Thesis (Masters)
Academic Subject : Mission Oriented Research - Deepwater Technology - Underwater pipelines
Subject: T Technology > TP Chemical technology
Divisions: Engineering > Chemical
Depositing User: Users 2053 not found.
Date Deposited: 30 Oct 2013 16:49
Last Modified: 25 Jan 2017 09:42
URI: http://utpedia.utp.edu.my/id/eprint/10104

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