Method for compensating for remote clock offset

Details Method for compensating for remote clock offset Method for compensating for remote clock offset

E - Fixed Constructions

21

B

E21B 47/14 (2006.01) E21B 47/16 (2006.01) H04L 7/00 (2006.01) H04L 7/02 (2006.01)

Patent

CA 2393579

A system is disclosed for synchronizing a clock in a well containing a drill string with a clock lo- cated near the surface of the well. The system includes devices for transmitting and receiving a pair of acous- tic 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.

La présente invention concerne un système permettant de synchroniser une horloge dans un puits contenant un tube de forage avec une horloge située à proximité de la surface de ce puits. Ce système comprend des dispositifs destinés à émettre et à recevoir une paire de signaux acoustiques entre les localisations associées à chaque horloge et à traiter ces signaux. Ce système détermine l'heure d'arrivée de chaque signal acoustique en analysant la forme d'une fonction du signal acoustique choisie parmi un groupe de fonctions adaptées pour déterminer un décalage d'horloge à la milliseconde près.

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