Kern Charters is the sister comapny of KCSI aerial patrol. HQ is in Bakersfield CA but pipeline bases are all around the country, their other major base is in a little town about 40 miles outside Midland, TX. Whole fleet is Citabrias except for one Partenavia that does some over water stuff off the CA coast. Good company, good maintenance, good management. Mins are 1500 TT for PIC though which are pretty high but they hire observers that ride in the back and can log some of the time. It's the only pipeline company that flies tailwheels which is big bonus for some.. TW+"low level" is a good combination depending on where you want to go long term.
Another one to try is Brentco aerial patrol based somewhere out in west TX... airport home base is called Skywest I think (7 T 7). They fly 182s.
American Patrols is another west TX place, all 172s and only 500TT mins and supposedly they provide housing. Anyway they are all looking for pilots right now. Oh, and Barr air patrol is another one. Barr is all over the country but I always see their adds pop up looking for pilots in TX.
For PIC starting pay is 40-46k for all these places.