Patent ID: 10162076

Abstract:
Methods and systems for estimating properties of formations penetrated by boreholes are provided, including conveying a carrier through a borehole having a transmitter, a first receiver, and a second receiver, the first receiver positioned a first distance from the transmitter and the second receiver positioned a second distance from the transmitter, generating a transient electromagnetic field with the transmitter, obtaining a total signal from signals received by the first receiver and the second receiver, performing a bucking calculation to obtain a pipe signal, applying a correction scheme to the total signal to generate a corrected formation property signal, wherein the correction scheme is Vcorr=Vmeas−P*Vmeas, wherein Vcorr is a correction signal, Vmeas is the total signal, and P is the pipe signal, estimating a formation property from corrected formation property signal to select a model of the formation, and adjusting a drilling operation based on the estimated property of the formation.