As of early May 2013, PVA has approximately 80,200 gross (approximately 54,200 net) acres in the volatile oil window of the Eagle Ford Shale play in Gonzales and Lavaca Counties, Texas. We entered this play in August 2010 and have built an estimated inventory of up to 766 well locations (120 of which were producing as of early May 2013).
As of early May 2013, we have five operated drilling rigs and two non-operated rigs running in the Eagle Ford Shale. We continue to consider opportunities to expand our position, having added approximately 47,000 net acres through acquisitions, leasing and non-consents over the past three years. We estimate as of year-end 2012 that we had 26.2 MMBOE of proved reserves in South Texas, 90% of which were oil and NGLs and 37% of which were developed. Pro forma for the acquisition of 12.0 MMBOE of Eagle Ford Shale assets in April 2013 for approximately $400 million, our proved reserves in the Eagle Ford Shale were approximately 38.2 MMBOE at December 31, 2012.