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Displaying records 111 through 111 of 2180
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Title: A reciprocating cleaning pig
Category: Pigsource Papers
Downloadable: No
Catalog No.: pg1013e
Date of Publication: not available
Price: $25.00 US
Authors: Ernest Appleton, Neil Stutchbuty, and David Bacon
Abstract: Pipeline Engineering and Supply Ltd and the University of Durham have been working together to design and develop a de-waxing pig, capable of travelling along a pipeline against the pipeline flow. Our aim is to tackle the problem of de-waxing flow lines, installed between platforms and wellheads, removing the requirement for piggable loops and subsea traps.

Background As discoveries are found in deeper water, the cost savings of installing subsea wellheads tied back to existing platforms are huge, when compared against installing new platforms. Also many older platforms in the Gulf of Mexico and the North Sea are having their lives extended, by the tie back of adjacent marginal fields. In most cases it would not be cost effective to develop these marginal fields on a "stand alone basis". Following this trend, pressure is increasing to extend the distance at which subsea wells can be tied into existing structures. In the North Sea it is common to install subsea wells 10Km, 50Km and in some cases 100 Km from an existing platform (see Figs 1 and 2, typical subsea field developments). From the pipeline engineering view, the challenge is to find a cost effected means of pigging these lines (or to design the process such that pigging can be eliminated) to reduce the risk of wax build up and corrosion.

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