A method and system for estimating a thickness of at least one casing string in a cased hole may comprise obtaining a plurality of induction measurements from a plurality of channels using a casing inspection tool, computing a quality vector for the plurality of channels, wherein each element of the quality vector is a numeric output, identifying the plurality of channels is a high-quality or a low-quality based at least in part on an evaluation of the quality vector to obtain a high-quality subset of the plurality of channels and a low-quality subset of the plurality of channels, and estimating the thickness of the at least one casing with an inversion using a high-quality subset of the plurality of channels. A system may comprise a multi-channel induction tool and an information handling system. The multi-channel induction tool may comprise at least one transmitter and at least one receiver.

An apparatus includes a series connection of at least a first impedance and a second impedance, the first impedance having a first terminal and a second terminal and the second impedance having a first terminal and a second terminal. The second terminal of the first impedance is connected to the first terminal of the second impedance forming a first node. The apparatus further includes a signal generator to apply a first amplitude modulated signal to the first terminal of the first impedance and a second amplitude modulated signal to the second terminal of the second impedance; and further includes an evaluation device configured to receive a first measurement signal from the first node and to determine information on the at least one physical parameter depending on the first measurement signal.

Disclosed herein are a probe for a nondestructive testing device using a crossed gradient induced current and a method of manufacturing an induction coil for a nondestructive testing device. The probe for a nondestructive testing device using a crossed gradient induced current includes an induction coil formed to have a predetermined width and to generate first and second induced currents in a direction crossing each other when a current is applied from a power supply, and a magnetic sensor part installed adjacent to the induction coil so as to measure the first and second induced currents induced from the induction coil.

A method includes introducing a pipe inspection tool into a first pipe positioned within a wellbore and further positioned within at least a second pipe. The pipe inspection tool includes an electromagnetic sensor having a coil antenna that includes a coil winding extending axially along at least a portion of the electromagnetic sensor. An excitation signal is transmitted between a first terminal and a second terminal of the coil antenna. A first response signal is measured between a third terminal and a fourth terminal of the coil antenna, wherein at least one of the third and fourth terminals is different from the first and second terminals. The first response signal is then processed to determine a characteristic of the first pipe.

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.

Eddy current logging enables corrosion monitoring in nested-pipe arrangements. An illustrative method of logging total thickness of the pipe walls includes acquiring measurements from an electromagnetic logging tool conveyed through the innermost bore, each measurement associated with a TRF combination (transmit antenna, receive antenna, and frequency), and further associated with a position along the bore. Multiple scale factors are applied to the measurements to determine multiple total thickness estimates for each position, each of the multiple scale factors corresponding to a subset of single-pipe defect profiles. Preferably, every possible single-pipe defect profile is included in at least one of these subsets. A total thickness log value for each position is derived from the multiple total thickness estimates for that position, and the derived total thickness log values are used to update a displayed total thickness log as the measurements are being acquired.

Eddy current logging enables corrosion monitoring in nested-pipe arrangements. An illustrative method of logging total thickness of the pipe walls includes acquiring measurements from an electromagnetic logging tool conveyed through the innermost bore, each measurement associated with a TRF combination (transmit antenna, receive antenna, and frequency), and further associated with a position along the bore. Multiple scale factors are applied to the measurements to determine multiple total thickness estimates for each position, each of the multiple scale factors corresponding to a subset of single-pipe defect profiles. Preferably, every possible single-pipe defect profile is included in at least one of these subsets. A total thickness log value for each position is derived from the multiple total thickness estimates for that position, and the derived total thickness log values are used to update a displayed total thickness log as the measurements are being acquired.

Detection device (1) for detecting a diameter and/or composition of a welding wire (5) and/or welding electrode (5) for a welding device, the detection device (1) having: an oscillating circuit (2), which has a coil (2A) through which the welding wire (5) and/or welding electrode (5) can be passed; and an evaluation unit (3) connected to the oscillating circuit (2) for determining at least one first oscillating circuit parameter (SKP1) which is characteristic of an attenuation of an oscillation signal occurring in the oscillating circuit (2) and at least one second oscillating circuit parameter (SKP2) which is characteristic of a signal frequency f of the oscillation signal occurring in the oscillating circuit (2), the evaluation unit (3) detecting the diameter and/or composition of the welding wire (5) passed through the coil (2A) of the oscillating circuit (2) and/or of the welding electrode (5) by means of the determined oscillating circuit parameter (SKP1, SKP2).

Measuring probe for non-destructive measuring of the thickness of thin layers, in particular in cavities, which are accessible by an opening or on curved surfaces, with a measuring head, which includes at least one sensor element and at least one contact spherical cap, assigned to the sensor element on a surface, to be checked, of the cavity, and with a gripping element for positioning and guiding the measuring probe on and/or along the surface to be measured, wherein on the gripping element, a long, elastically yielding guide bar is provided, which accepts the at least one measuring head on its end opposing the gripping element, in such a way that it is moveable with at least one degree of freedom in relation to the guide bar.

Embodiments of the present invention include systems, apparatuses, and methods that include a pipeline inspection apparatus containing a carriage, a first member including at least a first and second sensor configured to take a first round of measurements of a pipe, a second member including at least a third and fourth sensor configured to take a first round of measurements of the pipe, and a multiplexer. The first and second members are attached to opposite side members of the carriage. The carriage, first member, and second member are configured to surround a section of the pipe and are movably mountable on the pipe. The multiplexer receives a signal from the at least first, second, third, and fourth sensors and creates a measurement signal.