NDLI: Interference of Top Tensioned Risers for Tension Leg Platforms

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Zhang, Hanqing Smith, Derek
Copyright Year	2017
Abstract	Dry tree top-tensioned risers (TTRs) are widely used on floating production systems such as TLPs and Spars for drilling, completion, workover and production. The interference between neighboring TTRs is an important consideration which has a direct impact on the total TTR payload budget and the wellbay size for floater sizing and cost. Since the realistic sizing of a floater is essential towards the concept selection process for a field development, TTR interference should be addressed at the early stages of an offshore oilfield development. If the floater is a tension leg platform (TLP) and the field has strong current with associated extreme waves, riser interference may be very challenging and can have direct impact on riser design and the sizing and layout of the TLP. The waves and the oscillating motions of the TLP will have effects on riser interference. The oscillating motion of the TLP can excite the vibrational motion of the risers, and the wave-induced velocity of water particles and the motions of the risers with the movement of the TLP increases the relative flow acting on each riser. The combined effects will increase the deflection of the risers and thus the likelihood of riser interference. The industry has not seen an acceptable interference analysis approach yet which can account for the combined effects of current, waves, and TLP motions. This paper proposes two engineering approaches for the interference analysis of top tensioned risers for tension leg platforms with the combined effects of current, surface waves, and associated floater motions being addressed.
Sponsorship	Ocean, Offshore and Arctic Engineering Division
File Format	PDF
ISBN	9780791857700
DOI	10.1115/OMAE2017-61334
Volume Number	Volume 5B: Pipelines, Risers, and Subsea Systems
Conference Proceedings	ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering
Language	English
Publisher Date	2017-06-25
Publisher Place	Trondheim, Norway
Access Restriction	Subscribed
Subject Keyword	Drilling Oil fields Water Top-tensioned risers Surface waves (fluid) Deflection Tension-leg platforms Waves Flow (dynamics) Spar platforms Pipeline risers Design Particulate matter Ocean engineering Risers (casting) Wing spars Manufacturing systems
Content Type	Text
Resource Type	Article

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