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US 3,984,918 AGranted
Inclinometer
AssigneeSun Oil Company (Delaware)
InventorPreston E. Chaney
Life of this patent
Estimating the term…
Abstract
Disclosed is an inclinometer particularly adapted for use as a top-hole indicator in drilling operations. The inclinometer employs a ferrofluid in a closed tube; the fluid serves as an angle-sensitive movable core of a differential transformer. The secondary coils of the transformer are wrapped around the tube; the primary coil is wrapped around a core piece or the tube. Equipment is provided for comparing the outputs of the secondary coils to produce an angle signal. A sturdy construction for downhole use is disclosed.
Claims1
An inclinometer for use as a top-hole indicator comprising:
- a dough-nut shaped loop piece having a circular trench formed therein that is concentric with the loop piece, said loop piece having a bar extending thereacross with a slot formed therein;
- a ferrofluid partially filling said trench;
- a core piece positioned in said slot;
- exciter coil windings wrapped around said bar;
- a loop piece lid on said loop piece, said lid having two pairs of arcuate slots therein adjacent major and minor circumferences of said loop piece;
- detector coil windings wrapped around said loop piece and through said arcuate slots;
- and an outer case comprising a pan-shaped base member and a cover piece containing and enclosing said loop piece and loop piece lid.
4 more elements
Dependencies are inferred from the claim text.