“Comparison of modeling codes for resistivity and MWD instruments: part 1 1-D radial invasion,” Petrophysics, Vol. 41, No. 3, pp. 242-245, 2000.
The objective of this survey is to compare different computer modeling codes that have been developed various academic and industrial groups. Only the merical results are compared. The computation speed, memory requirements, and other factors are not covered in this project. In Part I of this series of reports, examine the codes that are used to compute the effects of the borehole and radial invasion on the readings induction and MWD instruments. Five groups participated in this exercise for the MWD instruments and four groups for induction instruments. Agreements between results obtained from those codes are generally good, except at a few isolated points. The maximum difference in computed apparent resistivity is less than 1.5 ohm-m or 7.2 percent in MWD codes and 0.08 ohm-m or 0.2 percent in induction codes.