If oil prices keep on sliding or if it stays low, then the largest hit will be those who need higher prices to survive. Shale oil, deep water driller, etc. And most of these are highly leveraged, so as the interest rate rise, then they will be also hit by debt service cost.
The largest shale regions in the country are shown below (source)
And based on the same source, the largest shale players are EOG, PXD, XOM, CHK, WLL.
Readings:
https://www.barrons.com/articles/eight-oil-stocks-that-can-prevail-in-the-age-of-shale-1523541567
https://www.fool.com/investing/2016/07/16/which-companies-are-the-biggest-shale-players-in-t.aspx
Here is an article with the has some of the big players in this sector and their debt/equity ratio.
https://www.marketwatch.com/story/these-us-shale-oil-companies-are-poised-to-profit-when-prices-rise-2016-03-14