METHOD FOR COMPENSATING FOR REMOTE CLOCK OFFSET

摘要

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 include s devices for transmitting and receiving a pair of acoustic signals between locations associated with each clock and processing those signals. The syste m determines the time of arrival of each acoustic signal by analyzing the shap e of a function of the acoustic signal chosen from a group of functions suitab le to determine a clock offset with millisecond accuracy.