...I recall readling a projected 14% decline rate post-peak for Cantarell, due to the use of massive nitrogen injection. That is why "technology" is such a double-edged sword when it comes to oil production.
Oh yes, here's that aritcle from 18 months ago...
http://www.energybulletin.net/1650.html
$this->bbcode_second_pass_quote('', '[')b]Mexico's Cantarell field decline deferred to 2006
by Rigzone staffer
August 12, 2004
The head of exploration and production at Mexican state oil monopoly Petroleos Mexicanos, or Pemex, said Thursday that the decline of the country's biggest oil field has been delayed until 2006.
...Cantarell supplies about two thirds of Mexico's 3.4 million barrels a day in crude oil output, producing 2.2 million barrels a day of heavy crude...
Ramirez said Thursday that the decline in Cantarell, originally expected last year, has been delayed until 2006,
when the deposits are expected to begin declining at a rate of 14% a year.