A series of articles by Market Realist have focused on how U.S. oil and gas companies operations in shale plays are managing their debt. Recent articles have reviewed the activities of Apache Corporation and Continental Resources. This week's article addresses Encana Corporation and EOG Resources. The next article will discuss Hess Corporation and Pioneer Natural Resources. These companies all have significant presence in shale production in the U.S. and each has its own strategy for managing long-term borrowing and debt and reacting to falling crude prices.