Effect of Fluid inside Casing on Resistivity Logging Response through Casing
With the help of the transmission line measure method of formation resistivity through casing, we have presented a calculated approach of potential distribution on the metal casing and in the fluid inside casing, realized the calculation of the resistivity logging response(RLR)of formation, and made inspection for two measure methods of formation resistivity. The numerical computing results show that the fluid in casing hardly has influence on the RLR of formation, but, when there are different kinds of fluids in casing, the interface of fluids has an obvious logging response for RLTA, and the response range of fluid interface is about the length of tool electrode spacing. The calculating examples also show that the measure and computation methods of formation resistivity for logging response have a larger effect when inside casing with fluid.
Qunjie Xu, Honghua Ge and Junxi Zhang
F. P. Liu et al., "Effect of Fluid inside Casing on Resistivity Logging Response through Casing", Advanced Materials Research, Vols. 361-363, pp. 70-75, 2012