My thoughts from our experience are as follows, not in any particular order.
- Rig 12-14 days sail time from land base. ( at best 10 days was once achieved )
- + 2 hrs time difference from Rig and Operational Office
- 4 hours fixed wing flights, then 1 - 1 1/2 hr boat transfer or 20 min Helicopter flight.
1 Location and the expected local weather and sea states., take a look at previous years meteo reporting, and local knowledge. No point having a critical service chain support, when say 50% of the time equipment and mores so personnel transfer might be restricted by WOW, because of the barge station keeping limitation or attending vessel access.
2 Size and deck loading. Decision to be made as to what the main support requirement will be. Mud and cement bulk and or pallet ?. under cover storage for weather protection? Tubulars, required plus contingency, we were a 3 well program , but carried a 2 well contingency on board Third party equipment, eg , casing running equipment. Contingency equipment eg. Fishing packages, all of these even to cover a 1 well program take up a large foot print. Stacking will/might not be an option
3 Management of waste, both rig and barge. This is a massive logistical issue which takes up a lot of space and process.
4 Turn around time for vessels feeding the barge and the vessels along side loading to go to the rig. Ie. Despatch time from home base, sailing time, time along side to discharge and back load, dual access to work both sides of the barge, at the same time would be a massive benefit.
5 24 hour coverage for all personnel requirements. Let the barge marine requirements be managed by the owner. ensure 24hr radio operator coverage.
Material management, storage, inventory etc. Managed by the Operators personnel. Logistics Coordinator, Lifting supervisor (2 for 24 hour ops), Materials man/dispatcher, 1 HSE supervisor, possibly and Environmental Observation Officer, either staff or Government.
6 Fuel, where is this going to be bunkered, require fuel supply for rig, barge and attending vessels. This volume and the transfer system, needs a lot of focus.
7 Do not underestimate the need for accommodation. If it is very remote, essential personnel access, will require an over load above rig POB capabilities. e.g. Casing crews arriving and no bed space on rig until Directional and Geologist team can be down manned. We booked for +/- 40 beds and often had 100 beds used especially on crew change days. Rig Location and flight, fixed wing and chopper or boat transfer will dictate this.
Bulk plant for both mud and cement, crew for this will be significant.
8 The barges ability to make enough water to supplement the rig system. We duplicated and upsized the rigs system, and also the barges system and still found we were on the limit. Mind you the water in the bay was very silty and took a lot of process and filtering.
9 Oil spill contingency. This will be a big package with a large foot print. either on the barge or the work boats, do not underestimate this size and its access for speedy deployment.
10 Landing for personnel transfer. Allow for several different sizes of boats or what ever is being supplied. Modify the personnel landing heights above sea level to cover the various height differences of the boats.
Jumping and or Swing ropes do not help the HSE issues!
Ensure access is available from both sides of the barge.
11 There are many more issues but to round off, we had massive issues with the use and management of explosives and storage. Again this is added bed space as government and military supervision was required. The companies primacy for the explosives, was not so much fishing problems but for well control contingency e.g. punching plugged strings if necessary, and perforating programs for testing and completion.
Hopes this helps