These two graphics from the Energy Information Administration (click to enlarge):
The first shows increased re-fracking of existing wells, and reduction in time needed to drill a horizontal well:
![re-fracking-e1447693875835](https://www.oilandgaslawyerblog.com/files/2015/11/re-fracking-e14476938758351.png)
The second shows how production has held up, despite decreased drilling activity:
![rigs vs. crude production](https://www.oilandgaslawyerblog.com/files/2015/11/rigs-vs.-crude-production.png)