I'm in agreement with this posting 100% below. My best guess is out in 2018 and by this time and decent prices Service and Oil Co's will have streamlined so extensively hiring people back will be in small #'s, cheaper salaries, and challenging for HR and Recruitment. People just won't forget how they was treated when showed the door.
1)"For the most part the budgets are set for the year so change is hard (budgets have been finalized and many companies are in financial trouble). 2) More importantly E&Ps will want to see that any price recovery is sustained and may first choose to improve their balance sheets while considering what new projects, that are lower risk and lower cost to go after first. 3) They also have the issue of ramping up people and facilities which isn't something that will be very quick (and be a very easy task). Don't expect any major changes until at least mid-2017 and possibly 2018".