E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 47/00 (2006.01) G01V 11/00 (2006.01)
Patent
CA 2346193
Accordingly, there is disclosed herein a method for radially profiling a property of a formation around a borehole that is suitable for combining measurements from multiple tools. In one embodiment, the method includes: (i) using a first downhole tool to obtain property measurements associated with multiple investigation depths; and (ii) determining from the property measurements estimated property values in predetermined radial zones. The predetermined radial zones preferably include one zone that is the region of investigation by a second tool. This allows the estimated property value to be used in conjunction with any measurements by the second tool, or alternatively, provides a reference for calibrating the second tool. The estimated property values for the various predetermined radial zones are preferably those that minimize a distance metric value (e.g. the Euclidean distance) between the actual property measurements and the measurements expected to result from a formation profile having the estimated property values. The first downhole tool could illustratively be a resistivity tool, and the second downhole tool could illustratively be a nuclear magnetic resonance tool.
Hagiwara Teruhiko
Strickland Robert W.
Halliburton Energy Services Inc.
Ridout & Maybee Llp
LandOfFree
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