Last I heard, total cost with everything (taxes, royalties, leases, etc) figured in, was around $30 p/bbl produced, so yes, $50 p/bbl profit could easily be expected when oil trades above $90.
I would figure a net of $33.25 using $95 as the revenue per barrel. This figure is EBTIDA, and uses a gross margin of about 35% according to the last P/L statement of Hemi Energy.