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US 12,516,601 B1Granted
Casing collar locator
AssigneeNorth Sea Electronics
InventorsTruls Kristian Knudsen, Richard Fyhn
Life of this patent
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Abstract
A casing collar locator, comprising two substantially identical inductor coils attached to a common stem with a fixed separation wherein the inductor coils generate substantially identical electromagnetic fields when an alternating current of substantially equal amplitude, such that a change in current in either the first inductor coil or the second inductor coil indicates a change in the magnetic or conductive materials in proximity to the electromagnetic field generated by the inductor coils, and methods for using such a casing collar locator.
Claims19
A casing collar locator, comprising:
- a first inductor coil;
- a second inductor coil;
- at least one signal generator;
- and
- a bridge circuit comprising said first inductor coil, said second inductor coil, and a resistor branch comprising a first resistor and a second resistor, said bridge circuit arranged such that the at least one signal generator generates an alternating current through said first inductor coil that is of substantially equal amplitude and opposite phase to an alternating of current through said second inductor coil,
- wherein a test voltage measured at an inductor node connecting the first inductor coil and the second inductor coil is compared to a reference voltage measured on a resistor node of the resistor branch, such that comparing the test voltage and the reference voltage yields a signal indicative of the proximity of conductive or magnetic material to either the first inductor coil or second inductor coil.
3 more elements
Dependencies are inferred from the claim text.