This is worth a look for a quick education on drilling and hydraulic fracking. Here are the links:
This might be a review of what many readers already know, but a review never hurts. Regardless, don't miss this time lapse video of a drilling rig walking to the next drill site. That's right, walking!
Finally, here's an astonishing factoid. The Bakken field has produced as much oil in the past two years (682 million barrels) as it did in the 60 years prior to that.