Utstyr og fremgangsmate for a synkronisere en klokke i et borehull med en klokke pa overflaten

A system is disclosed for synchronizing a clock in a well containing a drill string with a clock located near the surface of the well. The system includes devices for transmitting and receiving a pair of acoustic signals between locations associated with each clock and processing those signals. The...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	BIRCHAK JAMES ROBERT, SHAH VIMAL V, MINEAR JOHN WESLEY, GARDNER WALLACE REID, ROBBINS CARL A, MALLOY ROBERT L
Format:	Patent
Sprache:	nor
Schlagworte:	DETECTING MASSES OR OBJECTS EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY ELECTRONIC TIME-PIECES FIXED CONSTRUCTIONS GEOPHYSICS GRAVITATIONAL MEASUREMENTS HOROLOGY MEASURING MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS PHYSICS TESTING TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Beschreibung
Zusammenfassung:	A system is disclosed for synchronizing a clock in a well containing a drill string with a clock located near the surface of the well. The system includes devices for transmitting and receiving a pair of acoustic signals between locations associated with each clock and processing those signals. The system determines the time of arrival of each acoustic signal by analyzing the shape of a function of the acoustic signal chosen from a group of functions suitable to determine a clock offset with millisecond accuracy.