Remote field eddy current tools
AssigneeHalliburton Energy Services, Inc.
InventorsAhmed Elsayed FOUDA, Burkay DONDERICI
Life of this patent
Estimating the term…
Abstract
Apparatus and methods to investigate a multiple nested conductive pipe structure can be implemented in a variety of applications. An electromagnetic pulsed tool disposed in the multiple nested conductive pipe structure in a wellbore can make a set of log measurements and provide a measured log at different depths in the multiple nested conductive pipe structure. The total thickness of the multiple nested conductive pipes can be determined at each depth in the measured log using a remote field eddy current look-up curve. The remote field eddy current look-up curve can be correlated to a remote field eddy current regime in time-domain associated with time decay response. Additional apparatus, systems, and methods are disclosed.
Claims28
A method comprising:
- making a set of log measurements using an electromagnetic pulsed tool disposed in multiple nested conductive pipes in a wellbore, and forming a measured log having measurement data at different depths in the multiple nested conductive pipes;
- and
- determining total thickness of the multiple nested conductive pipes at each depth in the measured log using a remote field eddy current look-up curve, the remote field eddy current look-up curve correlated to a remote field eddy current regime in time-domain associated with time decay response.
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10-11. (canceled)
A machine-readable storage device having instructions stored thereon, which, when executed by a control circuitry of a machine, cause the machine to perform operations, the operations comprising:
- making a set of log measurements using an electromagnetic pulsed tool disposed in multiple nested conductive pipes in a wellbore, and forming a measured log having measurement data at different depths in the multiple nested conductive pipes;
- and
- determining total thickness of the multiple nested conductive pipes at each depth in the measured log using a remote field eddy current look-up curve, the remote field eddy current look-up curve correlated to a remote field eddy current regime in time-domain associated with time decay response.
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20-21. (canceled)
A system comprising:
- a tool, the tool being an electromagnetic pulsed tool having a transmitter coil and a receiver coil arranged such the receiver coil receives a secondary field in response to a primary field generated from the transmitter coil;
- and
- a processor arranged to evaluate multiple nested conductive pipes in a wellbore from a set of log measurements acquired by use of the tool disposed in the multiple nested conductive pipes operable to form a measured log of measurement data at different depths in the multiple nested conductive pipes, the processor arranged to determine total thickness of the multiple nested conductive pipes at each depth in the measured log by use of a remote field eddy current look-up curve, the remote field eddy current look-up curve correlated to a remote field eddy current regime in time-domain associated with time decay response.
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27-28. (canceled)
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Dependencies are inferred from the claim text.