MWD TOOL ACCURATELY MEASURES FOUR RESISTIVITIES
S.G. Mack, P.F. Rodney, M.S. Bittar Sperry-Sun Drilling Services Houston A newly developed multiple depth of investigation measurement-while-drilling (MWD) resistivity, sensor that measures four depths of investigation produces logs with the look and function of those from a conventional wire line dual induction tool. The tool measures phase shift and amplitude attenuation resistivity from four independent receiver-antenna spacings and two electromagnetic frequencies.