Southwestern Energy Plans to Drill for Oil by Luke Jones Posted 9/5/2011 12:00 am Updated 5 years ago After an announcement last month of its intention to test wells in the Lower Smackover Brown Dense Formation, Southwestern Energy Co. of Houston is preparing to drill for oil. Want the Full Article? Get Unlimited Archive Access for $19.95 per Year Readers must pay to access stories older than 15 days. Purchase Now Already have archive access? Login to view this article.