a couple of points on this Bakken decline graph:
1. the bulk of Bakken wells drilled are now over three years old, so notice the limited decline they have, albeit at lower rates than during the first three years. This is keeping many in business as decline for all purposes is not much and production flattens.
2. speaking as a Bakken reserves engineer for years, the ‘10% thereafter’ has been debunked. Terminal decline rates used to book reserves to the SEC after about year 10 are at typically 5% but sometimes as low as 3%. this tail might last 50 years or more, and does not include adds like refraccing down the road.
But the last couple years of increases are new wells. Those increases are most of what we see in the declines that already started for the overall field. By next month it should be down 140 thousand barrels a day from the peak in June.
https://www.eia.gov/petroleum/drilling/pdf/bakken.pdf
Other shale field data available at:
https://www.eia.gov/petroleum/drilling/
The Eagleford is far worse, down over half a million barrels a dayin less than a year.