Maintaining your kit when you are offshore really isn't as straightforward as it seems. Your tools and equipment are usually scattered around the rig in various inaccessible positions which require a harness, fall arrestor, tools aloft register and a good knowledge of limbo dancing. So that as you limbo between the doghouse roof* and the geolograph line* you manage to stop yourself and your toolkit from falling on the driller.
When it breaks, and something always breaks, the first question anyone will ask you is, "how long will it take to fix it?" My standard answer is "about 20 minutes". If the same person asks me again the second answer is "as long as it takes" and if someone asks me a third time they will be in a harness as fast as there arms can carry them into it. Then they will find themselves up a ladder holding a torch.
The example from today is a wheel that measures a cable which is attached to the rig. This cable moves as the rig moves and measures depth travelled into the well. The depth wheel is under constant stresses from the wire and a bunch of pulleys the wire goes through. it is held onto the rig with 2 grub screws and vibrates off more than once a hitch. Once it falls off you are knacked! Well until you get your self into the harness and limbo it back onto the rig.
*Rig equipment associated with MWD that breaks down a lot.
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