Energy independence, or impending oil shocks?
February 23, 2012 @ 1:59 pm
.......Each well produces a mere 150 barrels or so per day on average, and like shale gas wells, their output declines rapidly after initial production. As LeVine learned from a Bakken executive, the decline rate can be over 90 percent in the first year, then gradually tapers off. After seven or eight years, wells will have produced over 60 percent of their recoverable reserves. Therefore, you have to keep drilling like hell just to maintain production, and drill even more to increase it. Per LeVine’s source, “if the rate of drilling stays constant for a long time, the growth rate of field production will decrease, then plateau, then begin to drop.” But at around $7 million per well, these wells are not cheap.
As Laherrère’s chart shows, it takes about 1,200 wells to increase production by 150 thousand barrels a day on the Bakken tight oil treadmill. Compare that to the deepwater Gulf of Mexico, where a single gusher can produce 250 thousand barrels per day. By this metric it would take another 16,000 Bakken wells to achieve Citigroup’s projection of an additional 2 mbpd from shale oil, or five times the existing 3,200 Bakken wells.