SS: Subsea Well Intervention: Spoolable Compliant Guide: A Solution for Well Intervention
- Christopher Bridge (Schlumberger)
- Document ID
- Offshore Technology Conference
- Offshore Technology Conference, 3-6 May, Houston, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2010. Offshore Technology Conference
- 3.2.2 Downhole intervention and remediation (including wireline and coiled tubing), 4.3.4 Scale, 3 Production and Well Operations, 4.2.4 Risers
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The Spoolable Compliant Guide (SCG) is a conduit between a subsea well and a mono-hull vessel which allows well intervention toolstrings, coiled tubing and wireline to be guided into the well. The SCG consists of coiled tubing and jointed pipe suspended from a vessel and supported in a compliant "S?? shape though the water column. The compliant S shape acts to isolate the wellhead and well intervention package from the vessel's motion, which simplifies the mono-hull vessel to SCG connection, as well as the operations onboard the vessel.
Finite element studies were conducted to determine the operating feasibility, examining the effects of vessel position from the wellhead, vessel drift off, deployment and elastic and plastic fatigue life. These studies were complemented by small-scale model tests which examined pipe-in-pipe interaction, plastic and elastic fatigue, and wear of coiled tubing. The results show that the SCG from a mono-hull vessel is a feasible and cost effective alternative to rig based top tensioned risers for coiled tubing operations.
Overview of Spoolable Compliant Guide
The SCG is a conduit between the Well Intervention Package (WIP) and a vessel which allows toolstrings, conveyed by coiled tubing and/or wireline to be "guided?? into the well. The SCG consists of a length of tubular hung off at the top to the vessel and connected at the bottom to the WIP, as shown in Figure 1. The WIP contains well control equipment to control the well barriers and a lubricator that allows toolstrings to be lubricated into and out of the well. A subsea dynamic seal located at the top of the WIP isolates the guide pipe from the well fluids and pressure.
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