||In the past, the Lewis shale, which lies between the Mesaverde and Pictured Cliffs formations, was completed in only the few wells where large Lewis flow rates were encountered while air-drilling for deeper targets. However, the Lewis shale lies behind pipe in thousands of existing wells across the SJB. In a large number of these wells and in new Mesaverde/Dakota wells, the Lewis can be completed. In 1998, Burlington Resources (BR) initiated a study to characterize the Lewis shale gas potential in the San Juan basin (SJB) and to optimize exploitation. Historically, most SJB production has been from naturally fractured, low permeability, cretaceous sandstones (Dakota, Mesaverde, and Pictured Cliffs), or from the prolific Fruitland Coal. BR is one of the major players in the Lewis shale formation with over 1000 wells. Many of these are scheduled for recompletion, which may include hydraulic fracturing and horizontal drilling.