System and method for heat treating a tubular
First Claim
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1. A system for heat treating a tubular, comprising:
- a first coil configured to circumferentially surround the tubular and induce, from an outside of the tubular, current flow in a cylindrical portion of the tubular adjacent the first coil;
a second coil configured to be inserted into a bore of the tubular and induce, from within the tubular, in conjunction with the first coil, current flow in the cylindrical portion of the tubular, wherein the first coil and the second coil are positioned to inductively heat the cylindrical portion of the tubular at the same time; and
one or more controllers that control current flow to the first coil and the second coil for inducing current flow in the cylindrical portion of the tubular, the one or more controllers configured to;
provide alternating current to the first coil at a first frequency; and
provide alternating current to the second coil at a second frequency while providing the alternating current to the first coil at the first frequency, wherein the first frequency is different from the second frequency.
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Abstract
A system and method for heat treating a tubular. In one embodiment, a system for heat treating a tubular includes a first coil and a second coil. The first coil is configured to circumferentially surround the tubular and induce, from without the tubular, current flow in a cylindrical portion of the tubular adjacent the first coil. The second coil is configured to be inserted into a bore of the tubular and induce, from within the tubular, in conjunction with the first coil, current flow in the cylindrical portion of the tubular.
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Citations
14 Claims
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1. A system for heat treating a tubular, comprising:
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a first coil configured to circumferentially surround the tubular and induce, from an outside of the tubular, current flow in a cylindrical portion of the tubular adjacent the first coil; a second coil configured to be inserted into a bore of the tubular and induce, from within the tubular, in conjunction with the first coil, current flow in the cylindrical portion of the tubular, wherein the first coil and the second coil are positioned to inductively heat the cylindrical portion of the tubular at the same time; and one or more controllers that control current flow to the first coil and the second coil for inducing current flow in the cylindrical portion of the tubular, the one or more controllers configured to; provide alternating current to the first coil at a first frequency; and provide alternating current to the second coil at a second frequency while providing the alternating current to the first coil at the first frequency, wherein the first frequency is different from the second frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An inductive heat treatment apparatus, comprising:
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an exterior induction coil configured to surround an outside diameter of a tubular; an interior induction coil configured to occupy a bore of the tubular in alignment with the exterior induction coil; and one or more controllers coupled to the exterior induction coil and the interior induction coil;
wherein the one or more controllers are configured to simultaneously energize the exterior induction coil and the interior induction coil to concurrently heat treat a selected cylindrical portion of the tubular from exterior and interior of the tubular, wherein the one or more controllers are configured to provide alternating current to energize the exterior induction coil and the interior induction coil;
wherein the frequency of the alternating current provided to the exterior induction coil has a frequency that is lower than the frequency of alternating current provided to energize the interior induction coil. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification