E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
322/35, 73/68
E21B 47/12 (2006.01) E21B 4/00 (2006.01) E21B 4/02 (2006.01) E21B 41/00 (2006.01) E21B 47/18 (2006.01) H02K 49/10 (2006.01) H02K 5/128 (2006.01)
Patent
CA 1259502
S P E C I F I C A T I O N "Devices for Imparting Rotary Motion" ABSTRACT OF THE DISCLOSURE A down-hole signal transmitter includes an annular impeller mounted on a cylindrical casing and arranged to be driven by the mud flow passing along a drill string. Each of the impeller and the casing incorporates two sets of magnets with their poles arranged axially relative to one another such that axial movement of the impeller in one direction will tend to be resisted by a force of magnetic repulsion acting between the first set of casing magnets and the second set of impeller magnets and axial movement of the impeller in the opposite direction will tend to be resisted by a force of magnetic repulsion acting between the second set of casing magnets and the first set of impeller magnets. In this way the axial thrust due to the fluid flow is largely taken up. Furthermore the magnetic coupling between the magnet sets is such as to enable driving torque to be transmitted by the impeller to a rotary drive member on which the casing magnets are mounted.
492178
Arlott Colin
Russell Michael K.
Halliburton Energy Services Inc.
Robic Robic & Associes/associates
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