摘要:
The present invention concerns a downhole cable or control line detection tool. More particularly, but not exclusively, this invention concerns a method and apparatus for the downhole detection of a cable or control line associated with the external wall of a well casing. A downhole tool for the detection of downhole cable or control lines is provided. The downhole tool comprises an eddy current sensor, the eddy current sensor being arranged to be proximate to the internal wall of a well casing. The eddy current sensor is arranged for pulsed operation. The downhole tool further comprises a mechanism for rotating the eddy current sensor, with an axis of rotation parallel with the longitudinal axis of a well casing.
摘要:
The invention relates to a method for inspecting the interior of a material by moving a sensor at a substantially constant distance along a surface of the material. According to a first aspect of the invention, the sensor herein performs a uniform movement along the surface. This movement can be a composite movement, for instance a combination of a rotation movement and a translation movement. According to another aspect of the invention, the sensor comprises an ultrasonic transducer, and a medium which conducts ultrasonic waves well is placed between the sensor and the surface. The readily conductive medium can herein be held immobile on the surface, while the ultrasonic transducer is moved through or along the medium. The invention also relates to a device for performing the above described method.
摘要:
Provided is an inspection apparatus that includes a rotation disk configured to spin about an axis of rotation. The rotation disk includes a probe bushing configured to securely hold a standard eddy current probe a predetermined distance above a surface to be examined by the probe. The rotation disk is further configured to adjustably hold the standard eddy current probe such that the radial offset of the probe from the axis of rotation is set using a radial positioning set screw that is coupled to the rotation disk via a first slotted arm. The predetermined distance is set using a probe height set screw configured to secure the probe within the probe bushing. An outer stationary housing is coupled to the rotation disk such that the rotation disk rotates within the outer stationary housing.
摘要:
An apparatus (10) for determining the integrity of a tube (12) is provided. The apparatus (10) includes: a body (14) having an extension mechanism and configured to be inserted into the tube (12); and a flexible eddy current sensor (16) including a flexible housing (48) coupled to the body (14) via the extension mechanism, and one or more coils (50) disposed in the flexible housing (48). The flexible housing (48) is selectively extendable via the extension mechanism between a first position and a second position. The one or more coils (50) are farther away from the body (14) when the flexible housing (48) is in the second position than when the flexible housing (48) is in the first position. The one or more coils (50) electrically couple with an interior surface of the tube (12) when the flexible housing (48) is in the second position, and the flexible eddy current sensor (16) is operative to selectively induce electrical currents within the tube (12) via the one or more coils (50).
摘要:
An eddy current inspection device which is able to control a sensitivity decrease, and is able to reliably detect a defect. An eddy current inspection device (1) is provided with an orthogonal detection mode which measures an electromotive force signal using a coil pair which is configured by two coils (112) within the first row coil group (R1), a first intersection detection mode which measures the electromotive force signal using the first coil pair which is configured by the two coils (112) within the first row and second row coil groups (R1) and (R2) that are lined up in a direction which intersects with the scanning direction, and a second intersection detection mode which measures the electromotive force signal using the second coil pair which is configured by the two coils (112) within the first row and second coil groups (R1) and (R2) that are lined up in a direction in which a direction which intersects with the scanning direction is on the same side as the direction through which the first coil pair intersects and has a larger coil pair intersection angle than the coil pair intersection angle of the first coil pair. By evaluating the signal strength and the phase angle, a defect can be detected.