E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 47/12 (2006.01) G01V 1/26 (2006.01) G01V 1/44 (2006.01)
Patent
CA 2300599
A method and apparatus facilitating the event-synchronized recording of data at different locations, such as may occur at and within a borehole during a Measurement-While-Drilling ("MWD") operations. In a seismic survey the method and apparatus uses three subsystems: 1) a seismic source; 2) a borehole receiver, and 3) a pinger. When used in a borehole containing a drill string, the pinger strikes or vibrates the drill string causing an acoustic signal to traverse the drill string. The signal reaches a borehole receiver where it is detected. The signal is also reflected back up the drill steering to a sensor, nominally an accelerometer sensor, associated with a pinger where it is time- stamped by inclusive timing circuitry. By detecting and recording the round trip travel time of the acoustic signal and using a pulse transmitted from the downhole sensor package, for example, through the drilling mud, remotely occurring events can be synchronized without the use of an electrical connection between the electrically-separated systems recording, time-stamping, and storing the events. Using this method, events time-stamped by clock circuitry located within a borehole sensor package are synchronized to events time-stamped by clock circuitry on the surface to within plus or minus 2 milliseconds or better.
Baker Hughes Incorporated
Cassan Maclean
LandOfFree
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