The first Magnetic-Resonance-Image Logging-While-Drilling (MRI-LWD~*) tools have been built and field tested. The hardware was designed to provide data that are compatible with the Magnetic Resonance Imaging Log (MRIL~R) wireline tool in terms Of processing and interpretation. This paper discusses the theory of Robust MRIL measurements in the drilling environment and Reviews the theory of T_1 relaxation time measurements. We report On the results of a field test in the Gulf of Mexico. The MRI-LWD Device logged the entire total depth (TD) run form casing to TD And provided additional hydrocarbon-typing data in wiping mode Over the target zones. Wireline MRIL data and conventional logs Were used to verify the MRI-LWD measurements.
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