Nuclear Magnetic Resonance Logging: While Drilling, Wireline, and Fluid Sampling

摘要

Over the past decade, results from Nuclear Magnetic Resonance (NMR), logs have added significant value to petrophysical analysis by providing total, free-fluid and bound-fluid porosities. The development of Nuclear Magnetic Resonance tools for the LWD environment allows this valuable information to become available during the drilling operation, before significant invasion, allowing timely decisions, as well as reduced borehole risk. Data from a Nuclear Magnetic Resonance Logging While Drilling tool (MRIL-WD) was acquired in a recently drilled well in Saudi Arabia. This well was extensively cored and logged. In addition to LWD NMR, wireline NMR logs (MRIL-Prime), and NMR fluid analyzers (MRILab) were also run. This paper, following a brief discussion on the operation of MRIL-WD tool, compares and contrasts the results between while-drilling and wireline NMR logs. NMR fluid properties obtained from the NMR Fluid Analyzer are also crosschecked with the log data. Obtaining Nuclear Magnetic Resonance data earlier in the drilling process will allow NMR logging to become one of the backbones of formation evaluation.