New 2-MHz multiarray borehole-compensated resistivity tool developed for MWD in slim holes
- and others
To address the increasing number of slim holes being drilled in the range of 5.75 in. to 6.75 in., a mixed-borehole-compensated (MBHC) 2-MHz array resistivity tool with a 4.75-in. collar diameter is described for resistivity measurement-while-drilling (MWD) applications. MBHC is a unique technique developed to minimize the effects of borehole rugosity. The new MWD array resistivity tool makes multiple MBHC phase shift and attenuation resistivity measurements using five transmitter-to-receiver spacings. Five independent MBHC phase shift and attenuation measurements are made at 2 MHz. The five phase shift resistivities have similar vertical responses but with increasing radial depths of investigation. The five attenuation resistivities are also vertically similar but coarser and are radially deeper than the phase shift resistivities. This new array resistivity tool effectively exploits the technology and the interpretation methodology recently developed for wireline induction resistivities and the benefits of multispacing probes for formation evaluation. Most of the petrophysical applications developed in conjunction with the wireline resistivity AIT Array Induction Imager Tool are illustrated from MWD array resistivity logs acquired while drilling.
- OSTI ID:
- 207256
- Report Number(s):
- CONF-951002--
- Country of Publication:
- United States
- Language:
- English
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