The oil industry is like one of those organisms that evolved to thrive in an intertidal zone, or in a region with random lengthy droughts. The industry knows how to shed or calcify all the parts of itself it doesn’t need in lean times and then rapidly redeploy those parts as soon as the environment changes, because this sort of thing happens over and over and over. Sometimes the thing the industry doesn’t need it and therefor sheds is “workers” and that’s a shame, but so it goes.