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The IWS control system for the inVision Spool was rigged up on the main deck, outside of the red zone and drill floor area. The deck space used for rig in of the system was 36 ft2 and the overall weight of the system when off loaded from the supply boat was 9000 lbs.
The main HDMI screen was left in place at the control system container and the other interfaces with coil unit operator and driller’s cabin are communicated with via wireless connection. Electrical power was supplied 120 V × 60Hz to the system.
IWS zone compliant tablets were set up in the coil operator’s cab and driller’s cabin.
The interface gives the operators real time information as to diameter and lateral position of tubing/BHA at the location of the InVision Spool. The system also provides audio and visual indicators when diameter changes, or the spool senses that there is no object across it (Out of Hole).
Even will all the precautions taken by industry leading operators and service companies in the offshore environment unplanned events happen. Prior to this job, a sample coil connector of same make, model and size was pull tested to 78,000 lbs., to determine failure load. It did not fail. The connector on this job was pull tested as per procedure, staged up from 12k lbs to 25k lbs prior to running in the hole. Bumping up against the stripper to confirm an ‘out of hole’ condition had worked in the past but did not work this time. The coiled tubing connector released from the string in this situation.
Luckily the BHA was lodged in the stripper in this instance and did not fall onto the subsea equipment, which could have resulted in a complex operation to remedy.
During this job, the ability to gather information from above the FSV was proven to be extremely useful. Having a ‘virtual window’ into the pressure containment vessel allowed decisions to be made from information that has never been available before. In this instance, the effects of these decisions reached across multiple offshore vessels, supply chains, service suppliers and offices, with a net result of saved critical path time, cost, and removal of unknown and unexpected risks.