I doubt there would be any companies that own the refineries that would stay in TX at the risk of losing all the business they do in the rest of the US. TX would be a dystopian nightmare to live in if they did leave the US. No national company is going to stay, all the military bases and defense industry would be gone, no products will be delivered from other states for as long as it would take to figure out passports and immigration back into the US, the airports would no longer have FAA oversight, and a million of other small things that get taken for granted in everyday life would be gone. Companies that are US based have a responsibility to work in their shareholders interest and I can't see any rational shareholders wanting to leave the entire US market for the shithole TX market.
Edit: I replied to the wrong comment but it kind of fits so I'll leave it.