Operators have completed approximately 50 wells in the Pearsall Shale in the Maverick Basin of south Texas. The most active company in the play has been the former TXCO Resources, although EnCana and Anadarko Petroleum have also acquired large land positions in the basin. The gas wells had all been vertical until 2008, when TXCO drilled and completed a number of horizontal wells.
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Wikipedia also has an article on Pearsall Shale. This article may use content from the Wikipedia article under the terms of the GFDL.