RE: Aoka Mizu News8 Feb 2026 17:32
Hi Tincan,
To expand on Mirasols post;
The gubbins at the top of the Well is in two main parts - the Wellhead and the Christmas (Production) Tree.
The Wellhead is installed after the Conductor is set and is used to hang the remaining casings in while drilling.
The Tree is usually installed onto the Wellhead after the Completion has been run (can be run before or with the Completion too). Sometimes it's done by the Rig, other times it's done by the Construction Vessel. Given the operational costs of the Rig, in this case it'll likely be done by the Construction Vessel when she arrives.
SL has three manifolds which need to be placed and anchored on the seabed; gas injection, oil production and water injection.
Each Well has to be connected to the appropriate manifold (fluid line, power, control, instrumentation) and then the manifold connected (again, fluid, power, control, instrumentation) to the FPSO. This work is all done by the construction vessel, which will also install the mooring system for the FPSO.
Since the regulations don't allow flaring, the gas injection manifold & Well(s) will have to be hooked up and tested prior to production commencing.
Theoretically, they could then hook up one production Well and start producing immediately, but the Construction Vessel itself isn't cheap and I understand that the Wells will be batch drilled and completed anyway.
So the likely sequence will be for the first batch of Wells to be drilled and completed, with the FPSO being timed to mobilise to the FI as the last couple of wells in this initial sequence are being done.
The construction vessel will be mobilised some time before the FPSO to get all the prep work done before the FPSO arrives.
Then begins the intricate dance of coordinating all the activities to ensure the most efficient sequence is kept, while also making sure that the vessels don't interfere with each other- especially the anchor patterns of the Rig and the FPSO and the various flowlines during Rig moves.
Given the length of the drilling program, I imagine that after the initial batch of Wells is hooked up, the Construction Vessel will be demobilised for several months and come back later to finish off the work.
As Mirasol said, it's all relatively routine and only really gets exciting when the schedule of one of the Rig/vessels gets out of kilter for some reason.
That's when the Field Manager has to really be on top of everything, as some stand up knock down rows can develop between the various groups as they all have conflicting requirements and all cost a shed load of money every day in their various ways!