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An apparatus for magnetizing a wellbore tubular includes a plurality of co-axial magnetizing coils deployed on a frame. The coils are typically deployed about a track on which the tubular may be traversed. Exemplary embodiments may further include a magnetic field sensor disposed to measure the imparted magnetic field along the length of the tubular as it is removed from the track after magnetization. Exemplary embodiments of this invention provide for semi-automated control of tubular magnetization and thereby enable a repeatable magnetic pattern to be imparted to each of a large number of wellbore tubulars.

Titel:	Apparatus and method for magnetizing casing string tubulars
Autor/in / Beteiligte Person:	Stenerson, Kenneth ; Ceh, Leon ; McElhinney, Graham
Link:	View record in USPTO Patent Grants (Volltext)
Veröffentlichung:	2009
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Grants Sprachen: English Patent Number: 7,538,650 Publication Date: May 26, 2009 Appl. No: 11/487904 Application Filed: July 17, 2006 Assignees: Smith International, Inc. (Houston, TX, US) Claim: 1. An apparatus for magnetizing a wellbore tubular, the apparatus comprising: a nonmagnetic frame, a track supported by the frame, the track configured to support a wellbore tubular, the track including a plurality of nonmagnetic rollers deployed on the frame, the rollers configured to support the tubular and to transport the tubular in a direction parallel with a cylindrical axis of the tubular; at least one motor deployed on the frame, the motor configured to drive at least one of the nonmagnetic rollers such that actuation of the motor transports the tubular along the track in a direction parallel with the cylindrical axis of the tubular; a plurality of coaxial magnetizing coils deployed on the frame, the coils being cylindrically coaxial with one another, the coils being further cylindrically coaxial with a tubular supported by the track, each of the coils being connected with an electrical power source, the combination of the coils and the power source being configured to produce a non-alternating magnetic field in a direction parallel with the cylindrical axis of the tubular; a magnetic sensor deployed on the frame, the magnetic sensor configured to measure a magnetic field emanating from a wellbore tubular along the length of the tubular as it is transported along the track; and an electronic controller in electronic communication with the magnetizing coils and the magnetic sensor. Claim: 2. The apparatus of claim 1 , comprising from 4 to 32 magnetizing coils, the coils being spaced axially at a regular interval. Claim: 3. The apparatus of claim 1 , wherein the electronic controller is further in electronic communication with the at least one motor. Claim: 4. The apparatus of claim 1 , wherein the at least one motor is a hydraulic motor. Claim: 5. The apparatus of claim 1 , wherein each of the magnetizing coils are disposed to translate in a vertical direction. Claim: 6. The apparatus of claim 1 , wherein the magnetizing coils are electrically connected to the power source such that electric current flows in a clockwise direction about the tubular in a first subset of the coils and in a counterclockwise direction about the tubular in a second subset of the coils during magnetization of the tubular. Claim: 7. The apparatus of claim 6 , wherein said electrical connection to the power supply produces least one pair of opposing magnetic poles between neighboring ones of the coils. Claim: 8. The apparatus of claim 1 , comprising at least 8 magnetizing coils. Claim: 9. The apparatus of claim 1 , wherein the controller is configured to record magnetic flux as a function of axial position along a length of the tubular. Claim: 10. The apparatus of claim 1 , wherein the frame is fabricated from a nonmagnetic material. Claim: 11. The apparatus of claim 1 , further comprising a positioning sensor deployed on the frame, the positioning sensor configured to measure a position of the tubular on the track. Claim: 12. The apparatus of claim 1 , wherein each of the coils is mounted on the frame such that its position relative to the frame is adjustable in a direction perpendicular to the cylindrical axis of the coil, said adjustment of the coil positions operative to center the coils about a tubular deployed on the track. Current U.S. Class: 335/284 Patent References Cited: 2980850 April 1961 Cochran ; 3117065 January 1964 Wootten ; 3725777 April 1973 Robinson et al. ; 4072200 February 1978 Morris et al. ; 4458767 July 1984 Hoehn, Jr. ; 4465140 August 1984 Hoehn, Jr. ; 4672345 June 1987 Littwin et al. ; 4730230 March 1988 Helfrick ; 4743849 May 1988 Novikov ; 4931760 June 1990 Yamaguchi et al. ; 5025240 June 1991 La Croix ; 5126720 June 1992 Zhou et al. ; 5319335 June 1994 Huang et al. ; 5428332 June 1995 Srail et al. ; 5485089 January 1996 Kuckes ; 5512830 April 1996 Kuckes ; 5541517 July 1996 Hartmann et al. ; 5589775 December 1996 Kuckes ; 5657826 August 1997 Kuckes ; 5659280 August 1997 Lee et al. ; 5675488 October 1997 McElhinney ; 5923170 July 1999 Kuckes ; 6060970 May 2000 Bell ; 6310532 October 2001 Santa Cruz et al. ; 6369679 April 2002 Cloutier et al. ; 6670806 December 2003 Wendt et al. ; 6698516 March 2004 Van Steenwyk et al. ; 6991045 January 2006 Vinegar et al. ; 2004/0051610 March 2004 Sajan ; 2004/0263300 December 2004 Maurer et al. ; 2006/0131013 June 2006 McElhinney ; 0 301 671 February 1989 ; 60086809 May 1985 ; 03094407 April 1991 ; WO95/19490 July 1995 Other References: A. G. Nekut, A. F. Kuckes, and R. G. Pitzer, “Rotating Magnet Ranging—a new drilling guidance technology,” 8th One Day Conference on Horizontal Well Technology, Canadian Sections SPE/Petroleum Society, Nov. 7, 2001. cited by other ; W-D Coils brochure by Western Instruments, published Mar. 2001: http://www.westerninstruments.com/portableMPI/coils/WD—COI—1.jpg, http://www.westerninstruments.com/portableMPI/coils/WD—COI—2.gif; and http://www.westerninstruments.com/portableMPI/coils/WD—COI—3.gif. cited by other ; J.I. de Lange and T.J. Darling, “Improved detectability of blowing wells,” SPE Drilling Engineering, Mar. 1990. cited by other ; T.L. Grills, “Magnetic ranging technologies for drilling steam assisted gravity drainage well pairs and unique well geometries—A comparison of Technologies,” SPE/Petroleum Society of CIM/CHOA 79005, 2002. cited by other Assistant Examiner: Musleh, Mohamad A Primary Examiner: Donovan, Lincoln

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Apparatus and method for magnetizing casing string tubulars