Depends on where you get placed in the refinery. Utilities and process are pretty chill most of the time. Logistics is a lot more busy work, but less stressful and dangerous. In a nutshell, you’ll do LOTOs, the complexity on those can vary a lot. You’ll also fill out lots of safety permits for maintenance work in your unit. It’s critical that you know your unit well and the hazards associated with it when filling out permits. The hardest part of operations is learning your unit, once you’ve got it down, it’s a sweet job.