I’m in Canada and mostly work in the shale plays in Alberta, but also do some stuff with our wells off the coast of Newfoundland in the Orphan basin. I do not work on a rig (I work in Environment in the head office), but my husband and many of my friends have worked on shore, and I have good contacts in the office that do offshore work on the East Coast. So, with that said, take my advice with a grain of salt.
Generally (in Canada), you’re not going to companies like Chevron, Shell, BP, etc., you are going to their contractors. So, Haliburton, Schlumberger, etc. Drilling is often a contract job, and while going to an O&G company might get you the name of someone in one of these contract companies, it’s also just an extra step. The company I work for does not directly employ the guys on the floor. Pretty much everyone on site except for maybe HES and sometimes the DSM/WSM (Drill Site Manager and Well Site Manager) are contract personnel. So start there.
When the service companies hire, they like to see basic tickets, like WHMIS, H2S Alive, Confined Space, TDG (Transport of Dangerous Goods). That means they don’t have to pay to put you through those courses, another good step. They’ll end up putting you through their brand of HES training, but any training you have already related to HES is good.
My husband, when he worked in O&G, just went in to the offices and talked to either HR directly (if they were bigger), or a superintendant (if smaller - generally don’t have HR). That’s how he got in with Schlumberger and Cora Lynn Drilling.
Being older, you might get a bit of sway, but be aware that it’s a shit job sometimes. Just last week we had to deal with bullying issues on our rig - two guys beating the shit out of another guy. It’s unfortunately common to have to deal with these types of jerks, but if you can hold your own, you’ll be fine - as long as you aren’t mouthy. One of my buddy’s WAS mouthy, and held his own until he got hit in the face with a pipe wrench and lost four teeth.
Working off-shore is stressful and sucks sometimes. You will eat well, but they are long days. Also consider that you will likely be in and out via helicopter (hopefully) or boat. I’m not sure how it is in the US, and it varies from company to company, but simply being off-shore requires a bunch of additional training, though the company provides it. You also make pretty decent money, and you get a nice set of days off in a row when you’re back on shore. Not a good career for a family man though, that’s for sure.
Good luck!