Glossary of Terms - I

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ID	Internal Diameter, eg of casing or tubing.
Impeller	Rotating blade in a flowmeter.
Inclinometer	A device for determining tool orientation.
Injection Well	A well for injecting fluid (usually water) into a reservoir to improve production rates.
Inline Spinner (ILS)	A flowmeter, with through-wiring, which can be inserted anywhere in the toolstring.