APPLICATIONS OF LOW POWER BISTABLE ACTUATORS DOWNHOLE

A downhole actuator 10 is described which comprises a permanent magnet 40 movable under the influence of a magnetic field generated, in use, by an electrical circuit, the permanent magnet 40 occupying a selected one of a plurality of stable positions when the electrical circuit is not energised. The...

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Bibliographische Detailangaben
1. Verfasser:	DOWNTON, GEOFFREY
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ACTUATING-FLOATS BASIC ELECTRIC ELEMENTS BLASTING COCKS CONVERSION OR DISTRIBUTION OF ELECTRIC POWER DEVICES FOR VENTING OR AERATING DYNAMO-ELECTRIC MACHINES EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING ELECTRICITY ENGINEERING ELEMENTS AND UNITS FIXED CONSTRUCTIONS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS GENERATION HEATING INDUCTANCES LIGHTING MAGNETS MECHANICAL ENGINEERING MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES TAPS THERMAL INSULATION IN GENERAL TRANSFORMERS VALVES WEAPONS
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Beschreibung
Zusammenfassung:	A downhole actuator 10 is described which comprises a permanent magnet 40 movable under the influence of a magnetic field generated, in use, by an electrical circuit, the permanent magnet 40 occupying a selected one of a plurality of stable positions when the electrical circuit is not energised. The actuator may be used to actuate bias means in a downhole steering device (fig 4). Movement of the permanent magnet 40 may also be used to generate electricity.