US 2018/0324902 A1Published application

System And Method For Heat Treating A Tubular

AssigneeNational Oilwell Varco, L.P.

InventorsKevin Joseph Wyble, Daniel Lyle Hannahs, Daryl Stevenson, Shawn Lee Cunningham

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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.

Claims20

Dependent claims

A method for heat treating a tubular, comprising:

positioning a first coil to encircle a portion of a tubular to be heat treated;
positioning a second coil within a bore of the tubular at a location aligned with the portion of the tubular to be heat treated;
providing alternating current to the first coil at a first frequency;
and
providing alternating current to the second coil at a second frequency while providing alternating current to the first coil at the first frequency, wherein the first frequency is different from the second frequency;
and
heat treating the portion of the tubular by inducing current flow about an exterior cylindrical wall and an interior cylindrical wall of the portion of the tubular via the first coil and the second coil.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/025,216Filed 2 Jul 2018
Priority: 15 Mar 2013
Published: 8 Nov 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

H05B 6/06
Induction heating: control, e.g. of temperature, of power
H05B 6/101
Induction heating apparatus, other than furnaces, for specific applications: for local heating of metal pieces
H05B 6/38
Coil arrangements: specially adapted for fitting into hollow spaces of workpieces
H05B
Electric heating

Family

Application13/832,404Division · filed 15 Mar 2013
Application16/025,216Division
US 10,034,330 B2Related patent
US 10,841,985 B2Related patent
US 2014/0263284 A1Published application
US 2018/0324902 A1This patent

From the US filing history. Foreign family members aren’t listed.

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