Wellbore motor having magnetic gear drive
First Claim
Patent Images
1. A wellbore motor and rotary tool system, comprising:
- means for converting flow of fluid in a wellbore into rotational energy;
a magnetic gear member operatively coupled at an input thereof to the means for converting; and
a magnetic gear member output adapted to couple rotationally to a rotary wellbore tool, the magnetic gear member including an input shaft rotationally coupled to the means for converting, an output shaft disposed externally to the input shaft, and a magnet section disposed externally to the output shaft, the input shaft, the output shaft and the magnet section disposed inside a housing, the magnet section including a plurality of magnets circumferentially spaced about an interior of a magnet retainer, the magnet retainer having an external shape for cooperatively engaging an interior surface of the housing so as to prevent rotation therebetween, wherein a number of the magnets is selected to provide a selected rotational speed ratio between the input shaft and the output shaft.
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Abstract
A wellbore motor includes a means for converting flow of fluid in the wellbore into rotational energy. A magnetic gear member is operatively coupled at an input thereof to the means for converting. A wellbore rotary tool is coupled to an output of the magnetic gear member.
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Citations
21 Claims
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1. A wellbore motor and rotary tool system, comprising:
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means for converting flow of fluid in a wellbore into rotational energy; a magnetic gear member operatively coupled at an input thereof to the means for converting; and a magnetic gear member output adapted to couple rotationally to a rotary wellbore tool, the magnetic gear member including an input shaft rotationally coupled to the means for converting, an output shaft disposed externally to the input shaft, and a magnet section disposed externally to the output shaft, the input shaft, the output shaft and the magnet section disposed inside a housing, the magnet section including a plurality of magnets circumferentially spaced about an interior of a magnet retainer, the magnet retainer having an external shape for cooperatively engaging an interior surface of the housing so as to prevent rotation therebetween, wherein a number of the magnets is selected to provide a selected rotational speed ratio between the input shaft and the output shaft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A magnetically geared wellbore drilling motor and gear system, comprising:
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a turbine for converting flow of drilling fluid in a wellbore into rotational energy; an input shaft rotationally coupled to the turbine, the input shaft having at least one magnet thereon; an output shaft disposed rotatably about an exterior surface of the input shaft, the output shaft having thereon a plurality of circumferentially spaced apart pole pieces formed from ferromagnetic material; a magnet section having a plurality of magnets disposed circumferentially about an exterior of the output shaft, the magnet section having a magnet retainer with an external shape adapted to cooperate with an interior of a housing in which the magnet section is disposed such that rotation between the magnet section and the housing is substantially prevented; and a driving device rotationally coupled to the output shaft adapted to operate a rotary wellbore drilling tool, the driving device rotationally coupled to substantially isolate axial force on the drilling tool from the output shaft, the driving device arranged to transfer axial loading thereon to the housing. - View Dependent Claims (19, 20)
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21. A magnetically geared, powered wellbore completion valve, comprising:
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a turbine for converting flow of fluid in the wellbore into rotational energy; an input shaft rotationally coupled to the turbine, the input shaft having at least one magnet thereon; an output shaft disposed rotatably about an exterior surface of the input shaft, the output shaft having thereon a plurality of circumferentially spaced apart pole pieces formed from ferromagnetic material, the output shaft rotationally coupled to a valve spool; a magnet section having a plurality of magnets disposed circumferentially about an exterior of the output shaft, the magnet section having a magnet retainer with an external shape adapted to cooperate with an interior of a housing in which the magnet section is disposed such that rotation between the magnet section and the housing is substantially prevented; and at least one valve port in a casing proximate the valve spool, the port cooperating with a seal element on the valve spool such that rotation of the valve spool relative to the casing enables selective opening and closing of the completion valve, the at least one valve port when open providing hydraulic communication between an interior and an exterior of the casing.
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Specification