The US Energy Information Administration (EIA) reports that
US crude oil production (including lease condensate) averaged
almost 6.5 million bpd in September 2012, the highest volume in
nearly 15 years (Fig. 1). The last time the US
produced 6.5 million bpd or more of crude oil was in January
1998. Since September 2011, US production has increased by more
than 900,000 bpd. Most of that increase is due to production
from oil-bearing rocks with very low permeability through the
use of horizontal drilling combined with hydraulic fracturing.
The states with the largest increases are Texas and North
Fig. 1. Monthly US crude oil
production, July 1997
to September 2012.