Patent ID: 9458711
Filing Date: 2016-10-04
CPC Classification: E21B,G01V

Claim Text:
1. A downhole linear repeater network relay timing system for a drilling rig including a drillstring extending subsurface downwardly from a surface and terminating at a drillstring end, which timing relay system includes: multiple nodes located downhole between said drillstring end and said surface and associated with said drillstring, and at least one node located at surface, one or more of said nodes including a sensor adapted for providing a signal data set output corresponding to downhole conditions; said nodes receiving and re-transmitting said signals to form a telemetry relay network; said timing relay system being adapted for controlling all times within a relay frame according to constants known to all nodes including, but not limited to: guard times allocated between receipt and transmission (relay); and packet transmission duration; said nodes individually deriving their timing offsets relative to each other based on said constants, reception point-in-time of said signal and signal propagation time between nodes as a function of physical node distance separation; and a signal receiving node back-calculating an originating node sensor data acquisition point-in-time from the telemetry signal reception point-in-time and from said constants for use as an accurate time-of-measurement.