Presently, most of the subsea wells wire line interventions are performed from a drilling semi-submersible using a completion/work over riser, a heavy equipment for a relatively simple operation.

The paper presents a new concept of riser, specifically designed for that purpose. It permits a very significant cost reduction, it is diver less, guideline less and can be operated from a medium sized DP monomull.

Its design includes many original technical solutions in matters such as riser re-entry, safety and riser handling.

You can access this article if you purchase or spend a download.