Debt
There is good debt and bad debt. So long as the debt is earning more then the interest on the debt it is good debt. Even better if it is allowing growth in profits.
With out debt from shareholders, institutional investors, and banks all the oil would stay in the ground.
When a company is in a position to carry on business and keep growing without the bank debt than the interest will cease to come off the bottom line.
However, bank debt can enable a company to continue expanding and increasing profits that more than justifies the debt especially in a commodity bull cycle like the one oil companies are in now.
Surge is doing exactly that.