Big whoop. Experience in one field of work gives you no automatic knowledge in another. You're presumptuous to presume otherwise.
I think you are safe from replacement simply because most of the refineries will probably be shut down following your exit from this hollowed dirt ball.
Your over reliance on your presumption of what the future holds is your negation in the here and now.
Good luck to you in the future. I hope you keep your job until you are fully ready to kick back and just retire. Way too many don’t get to do that these days.