Abstract Field redevelopment reflects the unique foci of the integrated project team built between Ecopetrol and Oxy to redevelop the LCI oilfield. La Cira Infantas (LCI) is the oldest Colombian field, production started almost at the beginning of the twentieth century and since late 2005 is under a redevelopment phase, increasing production by more than 5 times in less than 5 years. Redevelopment involves over 1500 wells being drilled or worked over in order to increase recovery factor by about 8% from the C sands. Hundreds of wells are scattered throughout this brownfield which is divided in two principal areas, Cira and Infantas. This field is crossed by faults characterized by depleted and shallow gas bearing formations, challenging drilling with loss of circulation and well control issues, somehow unpredicted given the faulty nature of the area and the impact on the producing sands of previous EOR and drilling campaigns (early to mid twentieth century) (Fig. 1). This paper will describe the benefits of using the casing while drilling technology to drill wells where loss of circulation is anticipated, successfully eliminating flat times that otherwise would be used to cure losses when drilling conventionally due to the smearing effect which is enhanced by the addition of bridging agents and loss circulation material; and setting casing at the planned TD. Drilling with casing has shown that 10% cost reduction and 30% time savings were achieved against conventional drilling, with additional potential to reduce costs and time by improving the operational times employed for drill-out, BHA recovery, and cementing operations.