TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThis paper is a case history of what is believed to be the first ever utilisation of Coiled Tubing on a FPSO (Floating Production Storage Offloading) vessel to dissolve hydrate(s) in the riser. The main focus of this paper is to: 1) Publish actual job results pertaining to friction factors (drag co-efficient) of the coiled tubing inside the FPSO riser. 2) Highlight the innovative solution developed to allow for a possible emergency disconnection of the coiled tubing and CT Lubricator to allow the vessel to weathervane around the turret if required. 3) Explain the technique used to dissolve the FPSO Riser hydrate(s).
TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThis paper describes a system developed for live well perforating and presents several case histories of its usage. The system has currently been used on 13 jobs on the Statfjord field. A total of 2106 m has been perforated, and the longest interval in one run has been 277 m in this particular field. The system has been used both for initial perforation on new wells and reperforation in live wells or in combination with zone isolation. Both injectors and producers have been perforated using this system.An optimum perforating strategy can have significant impact on the economy of a well. During the past few years, techniques to perforate wells without having to use kill fluid have been developed. This reduced the cost and the problems that can occur as a result of kill the well. Kill fluid can not only affect the productivity of the wells, but may also create problems when produced back to the hydrocarbon process equipment. In addition, it has been noted that a higher and more stable sand free production rate will be obtained if the entire interval is perforated simultaneously. 1 Perforating underbalanced allows the debris in the perforating tunnel to be cleaned more easily. 2 If the well does not have to be killed, considerably less formation damage will occur, and the costs of kill fluid, lifting the well, and handling of the returned kill fluid are also eliminated.This paper describes a new live well perforating method deployed with a hydraulic workover unit, that allows long intervals to be perforated in wells with complicated well trajectories
This paper is a case history of what is believed to be the firstever utilisation of Coiled Tubing on a FPSO (FloatingProduction Storage Offloading) vessel to dissolve hydrate(s) inthe riser. The main focus of this paper is to:Publish actual job results pertaining to friction factors(drag co-efficient) of the coiled tubing inside the FPSOriser.Highlight the innovative solution developed to allow for apossible emergency disconnection of the coiled tubingand CT Lubricator to allow the vessel to weathervanearound the turret if required.Explain the technique used to dissolve the FPSO Riserhydrate(s). Introduction The Asgard field is a sub-sea development 200 kilometers offthe Norwegian coast. Water depths vary between 240 and 310meters. This field contains the gas reservoir Midgard and thereservoirs Smorbukk and Smorbukk South, which contain oil, condensate and gas. The sub sea production facilities consist of 50 production andinjection wells (located on 16 subsea manifolds) connected tothe FPSO vessel, Asgard A, the gas platform, Asgard B andthe storage ship for condensate, Asgard C.Asgard A started producing oil the first quarter of 1999, whilethe gas platform, Asgard B, started production the third quarterof 2000. The Asgard fields will from year 2007, alone, deliverapproximately 10 billion cubic meters gas per year, which isabout 15 percent of Norway's annual gas production, makingNorway one of Europe's leading gas exporters/producer. Inaddition, the field may obtain a peak production as high as200,000 bbls/day of oil and 60–70,000 bbls/day of condensate.This is equivalent to approx. 10 percent of Norway's totaldaily production.
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