SB21 was billed as an incentive plan for drillers to find more oil before it runs out (which is happening).  Since SB21 passed they have found more oil than in the 10 years before the bill, so it does seem to be working.  Maybe the deal was too good, but it is working.  5-10 years from now the state will be much better off as that oil is taxed.  Today's problem is oil prices.