i am hearing from some oil and gas guys in the Haynesville area, that the wells are at best depleted by 75% within the first year, and the worst by 90% depletion in the first year.

high initial rate and steep decline. i don't believe there is enough data to make a reasonable estimate of ultimate recovery and the assumptions going into these 100's of tcf (decades of current consumption) estimates.

http://www.theoildrum.com/node/5459

do your acquaintences have access to any pressure data on these haynesville candles ?