US 11,940,587 B2
Accurate and cost-effective inversion-based auto calibration methods for resistivity logging tools
Li Pan, Singapore (SG); Yi Jing Fan, Singapore (SG); Hsu-Hsiang Wu, Sugarland, TX (US); and Jin Ma, Houston, TX (US)
Assigned to Halliburton Energy Services, Inc., Houston, TX (US)
Filed by Halliburton Energy Services, Inc., Houston, TX (US)
Filed on Aug. 23, 2021, as Appl. No. 17/409,518.
Prior Publication US 2023/0057184 A1, Feb. 23, 2023
Int. Cl. G01V 3/28 (2006.01); G01V 1/50 (2006.01); G01V 13/00 (2006.01)
CPC G01V 3/28 (2013.01) [G01V 1/50 (2013.01); G01V 13/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method to calibrate a resistivity logging tool, comprising:
disposing the resistivity logging tool into a formation, wherein the resistivity logging tool comprises a transmitter and a receiver;
transmitting a signal with the transmitter;
acquiring a return signal at each logging point with the receiver;
assuming a formation model for a first set of continuous logging points in the formation;
assigning at least one calibration coefficient to each type of signal;
building an unknown vector that includes unknown model parameters and the calibration coefficients; and
inverting the unknown vector that includes the calibration coefficients and the unknown model parameters of the formation model, to calibrate the resistivity logging tool.