The following video is from Tuesday's Digging for Value, in which host Alison Southwick, Motley Fool Senior Analyst Michael Olsen, and contributor Tyler Crowe dive deep into top stories for today's energy sector investors.

In this segment, Michael takes a look at three natural gas exploration and production companies -- Range Resources (NYSE:RRC), Ultra Petroleum (NASDAQOTH:UPLMQ) and Southwestern Energy (NYSE:SWN) -- and determines which one is the best buy, the biggest sell, and the one that might want to keep in your portfolio for a little while longer. 

Michael Olsen, CFA owns shares of Ultra Petroleum. Fool contributor Tyler Crowe has no position in any stocks mentioned. The Motley Fool recommends Range Resources and Ultra Petroleum. The Motley Fool owns shares of Ultra Petroleum and has the following options: long January 2014 $30 calls on Ultra Petroleum, long January 2014 $40 calls on Ultra Petroleum, and long January 2014 $50 calls on Ultra Petroleum. 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.