DTEM with short spacing for deep, ahead of the drill bit measurements

DTEM with short spacing for deep, ahead of the drill bit measurements

A transmitter on a bottomhole assembly (BHA) is used for generating a transient electromagnetic signal in an earth formation. A processor estimates the distance to a resistivity interface using a signal produced by a receiver on the BHA. The transmitter-receiver distance may be less than 1 m. The es...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: GREGORY B ITSKOVICH, MICHAEL B RABINOVICH, EMMA IOMDINA, ARCADY REIDERMAN, SERGEY MARTAKOV
Format: Patent
Sprache:eng
Schlagworte:
DETECTING MASSES OR OBJECTS
GEOPHYSICS
GRAVITATIONAL MEASUREMENTS
MEASURING
PHYSICS
TESTING
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Beschreibung
Zusammenfassung:A transmitter on a bottomhole assembly (BHA) is used for generating a transient electromagnetic signal in an earth formation. A processor estimates the distance to a resistivity interface using a signal produced by a receiver on the BHA. The transmitter-receiver distance may be less than 1 m. The estimation of the distance is done in real time using a thin conductive sheet approximation.