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Scott Sheffield, CEO of Pioneer Natural Resources, in portrait Wednesday, Feb. 18, 2015 at the Pioneer building on N. Big Spring in Midland. James Durbin/Reporter-Telegram

Irving oil company Pioneer Natural Resources is betting on its leases in the eastern end of Permian Basin.

Pioneer filed for eight drilling permits over the past week to develop horizontal wells on seven leases split between Midland and Upton counties.

Located in an area of the Permian known as the Midland Basin, the wells target the Spraberry formation down to depths of 10,531 feet.

During a recent investors call, Pioneer Natural Resources Chief Executive Scott Sheffield said the western end of the Permian, known as the Delaware Basin, is being drilled “too aggressively.” Read more…