US 11,747,507 B2
Adjustable frequency processing of electromagnetic logging data
Luis Emilio San Martin, Houston, TX (US); Reza Khalaj Amineh, Houston, TX (US); and Burkay Donderici, Pittsford, NY (US)
Assigned to Halliburton Energy Services, Inc., Houston, TX (US)
Appl. No. 16/97,441
Filed by Halliburton Energy Services, Inc., Houston, TX (US)
PCT Filed Jul. 1, 2016, PCT No. PCT/US2016/040701
§ 371(c)(1), (2) Date Oct. 29, 2018,
PCT Pub. No. WO2018/004658, PCT Pub. Date Jan. 4, 2018.
Prior Publication US 2019/0137649 A1, May 9, 2019
Int. Cl. G01V 3/38 (2006.01); G01V 3/28 (2006.01); G01V 3/30 (2006.01); G01V 3/34 (2006.01); E21B 47/13 (2012.01)
CPC G01V 3/38 (2013.01) [E21B 47/13 (2020.05); G01V 3/28 (2013.01); G01V 3/30 (2013.01); G01V 3/34 (2013.01); G01V 2210/22 (2013.01); G01V 2210/6163 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A method for inspecting an interior of piping of a wellbore, the method comprising:
inserting an electromagnetic logging tool into an interior of one or more pipes within the wellbore;
setting initial operating parameters for the electromagnetic logging tool, wherein the initial operating parameters include frequencies of electromagnetic excitation waves, logging speed, and measurement cycle;
determine a spatial resolution associated with the logging tool and at least one of the one or more pipes;
transmitting the electromagnetic excitation waves and measuring electromagnetic response signals as the electromagnetic logging tool moves through the wellbore;
determining a threshold frequency associated with resolution degradation according to the logging speed and spatial resolution associated with the logging tool and at least one of the one or more pipes;
determining one or more pipe parameters of at least one of the one or more pipes by numerical inversion based on the measured electromagnetic response signals, wherein at least one of the one or more pipe parameters is a thickness of the at least one of the one or more pipes, wherein a portion of the electromagnetic response signals include frequencies equal to or above the threshold frequency being weighted higher than a portion of the electromagnetic response signals that include frequencies below the threshold frequency; and
adjusting at least the frequencies of the electromagnetic excitation waves according to the thickness of the at least one of the one or more pipes.