Back to results
US 11,747,507 B2Granted
Adjustable frequency processing of electromagnetic logging data
AssigneeHalliburton Energy Services, Inc.
InventorsLuis Emilio San Martin, Reza Khalaj Amineh, Burkay Donderici
Life of this patent
Estimating the term…
Abstract
Pipe]parameter determinations from electromagnetic logs can be improved, in accordance with various embodiments, by weighting signals with frequencies below a threshold associated with resolution degradation lower than signals with frequencies above the threshold. The threshold frequency may be determined based on a spatial resolution associated with the logging tool and a logging speed. Further embodiments are described.
Claims21
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.
5 more elements
A system comprising:
- an electromagnetic logging tool for disposal interior to one or more pipes within a wellbore, the tool comprising at least one transmitter, at least one receiver, and associated circuitry collectively configured to transmit electromagnetic excitation waves and measure electromagnetic response signals at multiple frequencies;
- wherein the electromagnetic logging tool is configured with initial operating parameters for the electromagnetic logging tool, wherein the initial operating parameters include the frequencies of the electromagnetic excitation waves, logging speed, and measurement cycle;
- a processing facility configured to:
- determine a spatial resolution associated with the logging tool and at least one of the one or more pipes;
- determine, based at least in part on a logging speed and a spatial resolution associated with the logging tool and at least one of the one or more pipes, a threshold frequency associated with resolution degradation;
- determine one or more pipe parameters of the 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 signal that includes frequencies below the threshold frequency;
- and
- adjust at least the frequencies of the electromagnetic excitation waves according to the thickness of the at least one of the one or more pipes.
5 more elements
A non-transitory computer-readable medium storing processor-executable instructions which, when executed by one or more processors, cause the one or more processors to:
- receive initial operating parameters for an electromagnetic logging tool inserted into one or more pipes within a wellbore, wherein the initial operating parameters include frequencies of electromagnetic excitation waves, logging speed, and measurement cycle;
- receive electromagnetic response signals measured by the electromagnetic logging tool responsive to electromagnetic excitation waves transmitted by the electromagnetic logging tool as the electromagnetic logging tool moves through the wellbore;
- receive logging-speed data associated with the electromagnetic response signals;
- determine, based at least in part on the logging-speed data, a threshold frequency associated with resolution degradation;
- and
- determine one or more pipe parameters of the one or more pipes by numerical inversion based at least in part on one or more of the received electromagnetic response signals that have frequencies equal to or above the threshold frequency, processed separately and weighted higher than electromagnetic response signals having frequencies below the threshold frequency, 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;
- and
- adjust at least the frequencies of the electromagnetic excitation waves according to the thickness of the at least one of the one or more pipes.
5 more elements
Dependencies are inferred from the claim text.