Relief well spool simplifies blowout containment

Oct. 3, 2017
Consultancy Add Energy has teamed with subsea solutions specialist Trendsetter Engineering to develop the Relief Well Injection Spool Lite.

Offshore staff

HOUSTON – Consultancy Add Energy has teamed with subsea solutions specialist Trendsetter Engineering to develop the Relief Well Injection Spool (RWIS) Lite.

RWIS Lite is a further development of the original RWIS, which allows for duplicity in shared components. The latter increases the flow capacity of a single relief well, said to be a safer and less demanding way of drilling multiple relief wells during a subsea well blowout.

The RWIS is placed between the relief wellhead and the BOP to allow multiple pumping vessels to inject kill fluid into the relief well.

RWIS Lite, claimed to simplify subsea installation and operation of the relief well system, is a flow spool without controls, allowing operators to install BOPs above the spool. This, the partners claim, greatly reduces the complexity of hooking up ‘kill’ vessels to the system.

The solution excludes gate valves, accumulators, ROV panels and a BOP, thereby reducing the complexity of the subsea hardware configuration.

At the same time, the deployment method duplicates the original set-up of the RWIS, so it can be run off a vessel of opportunity or a mobile offshore drilling unit using either a drill pipe or a wireline.

“When the RWIS Lite is used alongside an RWIS, it requires one less drillship and uses the existing BOP emergency disconnect system for maximum efficiency,” said Morten Haug Emilsen, managing director, Add Energy.

“The addition of the RWIS Lite makes relief well operations a standard subsea installation procedure instead of a unique one that requires vessel modifications,” said Brett Morry, global technical director of Trendsetter Engineering.

10/03/2017

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