Abstract: A device and method for inspecting an inspection object of in the vicinity of a further object, both of electrically conductive material, the device comprising a transmitter/receiver arrangement for generating an electromagnetic field in the inspection object, and for measuring a signal indicative of a transient eddy current which is generated in the inspection object by the electromagnetic field, wherein the device further comprises a magnetic shield means, providing at least a partial magnetic shield for the transmitter/receiver arrangement in a direction other than a measurement direction; use of the device from inside an annulus between an inner and an outer tubular, and a method of operating a hydrocarbon well having a well completion, and inspecting the well completion from inside an annulus.

Abstract: A method for detecting an anomaly in an assembly of a first and a second object of electrically conductive material forming an intermediate space between them, comprising providing a device (5) comprising a transmitter/receiver arrangement (7) for generating an electromagnetic field, and for measuring a signal indicative of an eddy current which is generated in the assembly by the electromagnetic field; arranging the device in a measurement position within the intermediate space; activating the device so as to receive a signal indicative of an eddy current in the assembly; and comparing the signal with a norm so as to detect if an anomaly is present at the measurement position, and a device for detecting an anomaly in an assembly of a first and a second object forming an intermediate space between them, the device comprising a transmitter/receiver arrangement a fixation means which. is arranged to fix the transmitter/receiver arrangement at a measurement position with respect to the inspection object.

Abstract: A method for detecting an anomaly in an assembly of a first and a second object of electrically conductive material forming an intermediate space between them, comprising providing a device (5) comprising a transmitter/receiver arrangement (7) for generating an electromagnetic field, and for measuring a signal indicative of an eddy current which is generated in the assembly by the electromagnetic field; arranging the device in a measurement position within the intermediate space; activating the device so as to receive a signal indicative of an eddy current in the assembly; and comparing the signal with a norm so as to detect if an anomaly is present at the measurement position, and a device for detecting an anomaly in an assembly of a first and a second object forming an intermediate space between them, the device comprising a transmitter/receiver arrangement a fixation means which. is arranged to fix the transmitter/receiver arrangement at a measurement position with respect to the inspection object.

Abstract: A device and method for inspecting an inspection object of in the vicinity of a further object, both of electrically conductive material, the device comprising a transmitter/receiver arrangement for generating an electromagnetic field in the inspection object, and for measuring a signal indicative of a transient eddy current which is generated in the inspection object by the electromagnetic field, wherein the device further comprises a magnetic shield means, providing at least a partial magnetic shield for the transmitter/receiver arrangement in a direction other than a measurement direction; use of the device from inside an annulus between an inner and an outer tubular, and a method of operating a hydrocarbon well having a well completion, and inspecting the well completion from inside an annulus.

Abstract: There is disclosed a method for monitoring wall thickness of an object having an electrically conductive wall, using a pulsed eddy current probe, wherein the same location on the wall is inspected repeatedly over an extended period of time. The pulsed eddy current probe is arranged in a predetermined position relative to the inspection location. The wall thickness dm is determined from a signal Vm which is recorded as a function of time t and from which a characteristic value ?m is determined, which is used to determined the wall thickness. The measurements are corrected for the influence of temperature. The disclosed method is particularly suitable for determining the rate of corrosion at the inspection location.

Abstract: A method for monitoring wall thickness of an object having an electrically conductive wall, using a pulsed eddy current probe comprising a transmitter means and a receiver means, which method comprises selecting an inspection location on the wall; at a plurality of inspection times &thgr;m (m=2, . . . ,M), arranging the probe in a predetermined position relative to the inspection location, inducing transient eddy currents in the object by activating the transmitter means, recording signals Vm with the receiver means; determining, for each inspection time &thgr;m, a temperature Tm indicative of the temperature of the object at the inspection location; and determining, from each of the signals Vm, a wall thickness dm pertaining to inspection time &thgr;m, wherein the temperature Tm is taken into account.

Abstract: A method of determining a surface profile of an electrically conductive object, using a probe having a transmitter adapted for inducing transient eddy currents in the object, and a receiver which is adapted for providing a signal indicative of a magnetic field property wherein the surface profile is determined by measuring a characteristic value at selected inspection positions at a selected set of inspection points to obtain a set of inspection values, and correcting for any offsets using a calibration function determined from a set of calibration values taken at a set of calibration positions at a calibration point.

Abstract: The invention relates to a method of determining a surface profile of an electrically conductive object, using a probe having a transmitter/receiver arrangement for inducing transient eddy currents in the object, for providing a signal indicative of a magnetic field property, the method having the following steps:

Abstract: Measuring the wall thickness of an electrically conductive object using a probe comprising a transmitter coil, a first receiver and a second receiver, which method comprises arranging the probe near the object; inducing transient eddy currents in the object and recording the signals of the receivers with time; measuring the wall thickness from a characteristic of one of the signals; calculating a characteristic value from a combination of the signals; and correcting the measured wall thickness for the distance between the probe and the object using a pre-determined relationship between the wall thickness and the characteristic value for different values of the distance between the probe and the object.

Abstract: A method of inspecting an electrically conductive object so as to detect the presence of an anomaly using a probe comprising a transmitter coil and a receiver coil, which method comprises the steps of: (a) selecting a set of points on the near surface of the object that are to be inspected; (b) selecting a first inspection point from the set; (c) positioning the probe at the selected inspection point, inducing eddy currents in the object and determining a characteristic value, &PHgr;, of the electromagnetic field generated by the eddy currents; (d) selecting a next inspection point from the set and repeating step (c) until all inspection points have had their turn; and (e) inferring that an anomaly is present at an inspection point if the characteristic value &PHgr; differs significantly from a norm.

Abstract: Detecting the presence of an anomaly in or near an object using a probe comprises: a) selecting a set of points on the near surface which are to be inspected, and selecting a first direction and a second direction; b) selecting a first inspection point from the set; c) positioning the probe at the selected inspection point in the first direction, inducing eddy currents in the object and determining a characteristic value of the electromagnetic field; d) positioning the probe in the second direction at the selected inspection point, inducing eddy currents in the object and determining a characteristic value of the electromagnetic field; e) selecting a next inspection point from the set and repeating steps c) and d) until all inspection points have had their turn; and f) inferring that an anomaly is present at an inspection point if a combination of the characteristic values in the first and second direction deviates significantly from a norm.

Abstract: Measuring the wall thickness of an electrically conductive object using a probe comprising a transmitter coil, a first receiver and a second receiver, which method comprises arranging the probe near the object; inducing transient eddy currents in the object and recording the signals of the receivers with time; measuring the wall thickness from a characteristic of one of the signals; calculating a characteristic value from a combination of the signals; and correcting the measured wall thickness for the distance between the probe and the object using a pre-determined relationship between the wall thickness and the characteristic value for different values of the distance between the probe and the object.

Abstract: Detecting the presence of an anomaly in or near an object using a probe comprises:

Abstract: A method of inspecting an electrically conductive object so as to detect the presence of an anomaly using a probe comprising a transmitter coil and a receiver coil, which method comprises the steps of: