In this week's edition of The Motley Fool's energy-focused show, "Digging for Value", analysts Joel South and Taylor Muckerman discuss second-quarter earnings from National Oilwell Varco (NYSE:NOV). With phenomenal top-line growth, the market discounted this valuable supplier due to compressed margins throughout its product portfolio. Check out the video below to hear whether the contracting margins are reasons for concern or present another buying opportunity?

Joel South has no position in any stocks mentioned. Taylor Muckerman owns shares of Ensco. The Motley Fool recommends National Oilwell Varco and Seadrill. The Motley Fool owns shares of National Oilwell Varco and Seadrill. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.