Means for generating electricity during drilling of a borehole

H - Electricity – 02 – K

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H02K 7/18 (2006.01) E21B 41/00 (2006.01) E21B 47/18 (2006.01) H02K 35/00 (2006.01) H02K 35/02 (2006.01)

Patent

CA 1191531

ABSTRACT Apparatus for generating electric energy in a borehole during drilling includes a housing having connectors at the ends thereof for inserting the housing in a drill string; the housing is provided with a conduit system for passing fluid through the housing, a valve located in the conduit system, and an electric generator; the electric generator con- sists of a stator and an armature; the stator is mounted immovably in the housing and the armature is mounted such that it can move in a reciprocating mode relative to the stator by the action of changes in the fluid flow through the conduit system caused by the operation of the valve; the apparatus operates in a simple manner, has a minimum of seals and bearings and occupies a small volume such that the generator can be incorporated in a pipe section that houses the sensors, the signal processor, the trans- mission system and the electric accumulator.

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