Method and apparatus for clock synchronization
AssigneeBaker Hughes Incorporated
InventorsRadu Coman, Michael Neubert
Life of this patent
Estimating the term…
Abstract
A system for synchronizing components of a downhole system includes: a source assembly including a source clock; an electromagnetic source associated with the source assembly and configured to emit an electromagnetic signal into an earth formation at a transmission time; a receiver assembly including a receiver clock; an electromagnetic receiver associated with the receiver clock and configured to detect the electromagnetic signal; and a processor configured to identify a receipt time of the electromagnetic signal based on the receiver clock and adjust the receiver clock by comparing the transmission time to the receipt time.
Claims5
A method of estimating a property of an earth formation, comprising:
- disposing a carrier in a borehole in the earth formation, the carrier including one of a receiver assembly and a source assembly, the receiver assembly including a receiver clock and the source assembly including a source clock;
- transmitting an electromagnetic (EM) signal through the earth formation from an EM source in the source assembly at a pre-selected transmission time, the transmission time being identified based on the source clock;
- detecting the electromagnetic signal via an EM detector in the receiver assembly;
- identifying a receipt time of the detected electromagnetic signal using the receiver clock;
- adjusting the receiver clock by comparing the transmission time to the receipt time to synchronize the receiver clock to the source clock;
- emittng a seismic signal into the earth formation from a seismic source in the source assembly;
- detecting the seismic signal by at least one seismic receiver disposed in the receiver assembly;
- and
- estimating at least one property of the formation based on the detected seismic signal.
Dependencies are inferred from the claim text.