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Rigless Intervention Case Studies in the North Sea and Equatorial Guinea

Topics: Offshore

There are considerable benefits to conducting rigless subsea well intervention from specialized monohull vessels. Two case studies provide an overview of operations on subsea wells, from intervening through the production tree (XT) to XT change-out and well-plug-and-abandonment (P&A)/wellhead-removal operations.

Overview of Rigless and Riserless Light Well-Intervention (RLWI) Techniques

Rigless and RLWI activities have been carried out for more than 25 years across the North Sea. The purpose of the following case studies is to demonstrate that with effective project management (planning, developing, execution, and close-out), the use of RLWI is a flexible and extremely cost-effective method that operators can use for a single well or across a number (a campaign) of subsea wells, irrespective of subsea-tree type or close proximity.

In order to conduct in-hole subsea-well operations without the use of a traditional mobile offshore drilling unit, three pieces of critical equipment (along with a trained and competent crew) are required:

  • A dynamically positioned vessel of sufficient size and capability to accommodate the equipment and personnel required
  • A derrick or tower with heave compensation to deploy and recover equipment
  • A subsea-intervention lubricator (SIL) to facilitate well control and well access
This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper OTC 24065, “Rigless-Intervention Case Studies: UK and Africa,” by Oliver Willis and Phillip Bosworth, Helix Energy Solutions Group, 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 The paper has not been peer reviewed.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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Rigless Intervention Case Studies in the North Sea and Equatorial Guinea

01 November 2013

Volume: 65 | Issue: 11

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