Note that analysts estimates can be way off. Not to mention great variances of cost within the same field from sweet spots to marginal wells.
http://www.reuters.com/article/2014/10/23/idUSL3N0SH5N220141023
Lost of estimates at the link above, but notice some significant variations.
For example, from that same link.
UBS INVESTMENT RESEARCH
EAGLE FORD $43.34
GOLDMAN SACHS
EAGLE FORD $80-$90
Just an observation, but the price seems to drop in election years and predictions have a way of becoming self-fulfilling prophesy until market factors reassert themselves (6 mos to a year).