"Small Oil" has come up a few times on this forum:
http://forum.juhlin.com/showthread.p...sylvania+crude
If you search down the thread there are a couple of articles I found a few years ago. However, charging a 5,500 barrel a day refinery (ie filling up the system so it can run efficiently) would require a considerable investment in transport infrastructure. So you'd really need a working railway link between your production fields and the refinery.
Or you could go old school and build something like this:
http://www.scvhistory.com/scvhistory/ap2926.htm
Which would be much less efficient but would be a useful precursor refinery (as you would need fuel for the oil wells, the railway, and refinery itself). And be able to aid local recovery.