An Analysis of the At-Bit Resistivity Decision Making Process
G. Lindsay · IPTC 2008: International Petroleum Technology Conference · 2008
A variety of Logging While Drilling (LWD) resistivity devices are currently available, ranging from conventional propagation resistivity to azimuthally sensitive resistivity to near bit resistivity devices. A comparison of the cost/benefits and challenges of using a near bit resistivity device and a normal LWD propagation resistivity device is presented. The comparison and operational process, in both oilbased and water-based drilling fluids, are described as experienced in a high spread cost example from West Africa and a low spread cost example from onshore US.