PVC Casing - large diameter/deep applications

I am looking for materials for a well that will be 24 inches in diameter and about 2800 feet deep. Is fuse welded PVC a reasonable option? Concerns with PVC are cementing issues (low collapse strength), ability to pass pressure test of 150 psi every 5 years, and longevity of the material in general (lifetime of well expected to be 40 - 50 years) I don't want to use steel due to scaling issues (disposing of treated wastewater). Would stainless steel help with scaling issue? I am also considering FRP, but there seem to be very few manufacturers of 24" diameter FRP with a threaded coupling that will withstand a 150 psi pressure test every 5 years. One last option is to go with steel casing and scrape it every 2 years at a cost of about $50,000 per event. Is this the right forum or is this better off posted on a petroleum engineering type of forum? Thanks for any help provided.