MAGNETIC GEAR FOR USE WITH WELLBORE INSTRUMENTS

Title:

MAGNETIC GEAR FOR USE WITH WELLBORE INSTRUMENTS

Document Type and Number:

WIPO Patent Application WO/2014/037752

Kind Code:

A3

Abstract:

A wellbore rotating instrument system includes a source of rotational energy for transmission thereof to within a wellbore. At least one magnetic gear assembly is coupled at its input to an output of the source. A rotating load is coupled at its input to a rotational output of the magnetic gear assembly. The at least one magnetic gear assembly comprises a housing, a stator disposed in the housing proximate an inner wall thereof, a second shaft rotatably supported on bearings disposed at longitudinally spaced apart locations inside the housing and a first shaft rotatably supported inside the output shaft. The stator comprises a plurality of magnets disposed in generally circular laminations. The second shaft comprises a non-magnetic, electrically non- conductive body and a plurality of pole pieces disposed circumferentially therearound. The first shaft comprises magnets disposed around its exterior circumference and shaped to fit rotatably within the second shaft.

Inventors:

MCCANN RICHARD (GB)
SMITH KENNETH (GB)
BIRCHALL JEFF (GB)
COCHRAN JAMIE (GB)
RUSHBY MICHAEL (GB)

Application Number:

PCT/GB2013/052903

Publication Date:

January 15, 2015

Filing Date:

November 06, 2013

Export Citation:

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Assignee:

ZILIFT HOLDINGS LTD (GB)

International Classes:

E21B4/00; H02K49/10; E21B43/12; H02K1/18; H02K1/28

Domestic Patent References:

WO2007064591A2

2007-06-07

Foreign References:

EP0410933A1	1991-01-30
EP1843454A1	2007-10-10
US3678708A	1972-07-25
US2907611A	1959-10-06
US20100176674A1	2010-07-15

Attorney, Agent or Firm:

DOCHERTY, Andrew (Aurora120 Bothwell Street, Glasgow G2 7JS, GB)

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