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Surface-Controlled Formation-Isolation Valves Used for Temporary Well Suspension

Topics: Offshore

To increase deepwater-drilling-rig availability, operators have adopted the strategy of transferring subsea-tree-installation responsibility from offshore drilling rigs to subsea-equipment-support vessels (SESVs). The installation from a rig can take 1 to 3 weeks; transferring this responsibility to the support vessel enables the rig to move to the next well sooner and offers significant time savings. This paper introduces a fit-for-purpose surface-controlled formation-isolation valve (SFIV) designed for the temporary well suspension required for this strategy.

Introduction

One of the deepwater subsea-field--development operations being transferred to SESVs is the vertical-tree installation employing the “tree-by-wire” technique. One of the key components of this technique is the use of two remotely operated formation-isolation valves that suspend the well after installation of the tubing hanger. Once the well is suspended, the rig can be moved to the next well. The tree is then installed by use of a heave-compensated wire from an SESV.

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper OTC 23997, “Case Study: Surface-Controlled Formation-Isolation Valves and Their Application as a Barrier for Temporary Well Suspension,” by Oguzhan Guven, Joao Mendonca, and Dan Thai, Schlumberger, prepared for the 2013 Offshore Technology Conference, Houston, 6–9 May. The paper has not been peer reviewed. Copyright 2013 Offshore Technology Conference. Reproduced by permission.
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Surface-Controlled Formation-Isolation Valves Used for Temporary Well Suspension

01 April 2014

Volume: 66 | Issue: 4

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