This is the huge problem with Fracking shale oil and gas. Due to the extremely high annual decline rates of the typical shale oil or gas well, companies must continue to spend a great deal of capital expenditures to replace what was lost. It’s known as the DRILLING TREADMILL…. once you start, you can’t get off.
As the article states, in one year the top 127 oil and gas companies spent $110 billion more on capital expenditures than they received from operations. So, they acquired $106 billion in additional debt (a large percentage through the Junk Bond Market) and sold assets to make up the difference.