Re: John A
Of course, the global decline rate from existing wellbores is probably closer to ExxonMobil's estimate of 4% to 6% per year. And in fact since 2005, global Crude + Condensate production has barely increased. If we subtract out condensate, which is a byproduct of natural gas production, actual crude oil production (less than 45 API gravity) has probably not shown any material increase since 2005.
In any case, I don't see how anyone can argue that the overall decline rate from existing US wellbores has not dramatically increased, as more and more US oil and gas production comes from very high decline rate tight/shale plays.
However, the truly dangerous threat facing developed net oil importing countries like the US is the catastrophically high post-2005 Available CNE depletion rate, i.e., the rate at which we are consuming the post-2005 cumulative supply of global net exports available to importers other than China & India. While Cornucopians are celebrating over what appears to be a continuing "Undulating Decline" in US crude oil production since 1970, for the average US consumer the reality is that global annual crude oil prices more than quadrupled from 2002 to 2012.
Info on CNE Depletion rates:
http://peak-oil.org/2013/02/commentary- ... ity-index/In regard to rising production versus CNE depletion, from said article, combined normalized annual total petroleum liquids production (BP, 1992 rate = 100%) for the Six Country Case History* Vs. remaining post-1992 Six Country CNE (Cumulative Net Exports), by year:

*Six Country Case History: Indonesia, UK, Egypt, Vietnam, Argentina, Malaysia, which have all hit, or closely approached, zero net oil exports