Patent ID: 9007231
Filing Date: 2015-04-14
Classification: G01V

Abstract:
1. A system to synchronize distributed measurements in a borehole, the system comprising: a plurality of wired segments coupled together by couplers; a plurality of nodes configured to measure, process, or relay information obtained in the borehole to a surface processing system, each of the plurality of nodes comprising a local clock and being disposed at one of the couplers or between couplers; and the surface processing system coupled to a master clock and configured to determine a time offset between the master clock and the local clock of an nth node among the plurality of nodes based on a downhole generated synchronization signal, wherein the surface processing system determines the time offset associated with the local clock of the nth node based on a subtracting a first value from a second value, the first value including the master clock time and the second value including a sum of components that include the local clock time of the nth node, an aggregate of a delay associated with every node from the surface processing system to the nth node, an aggregate of a delay associated with every wired segment from the surface processing system to the nth node, and an aggregate of a delay associated with every coupler from the surface processing system to the nth node.