Method and device for logging the fluid depth in a wellbore

Details Method and device for logging the fluid depth in a wellbore Method and device for logging the fluid depth in a wellbore

E - Fixed Constructions

21

B

E21B 47/04 (2006.01) E21B 47/14 (2006.01)

Patent

CA 2697323

In a method for logging the location of a fluid depth (13) in a wellbore (10), an acoustic event is allowed to take place in a specific manner at the ground surface (11). This acoustic event generates pressure waves. The pressure waves travel in the wellbore (10) downward. The pressure waves traveling in the wellbore (10) are reflected at least also at the fluid depth (13). At the ground surface (11), the pressure waves traveling there out of the wellbore (10) are picked up and the time of travel since the acoustic event is measured. The picked-up and measured pressure waves are analyzed and, together with the associated time of travel, the location of the fluid depth (13) is deduced. The acoustic event generates a signal pattern (42) having a predetermined, time-variable frequency spectrum. The signal pattern (42) is emitted as vibration event into the wellbore (10), travels downward, and is reflected. At the ground surface (11), the picked-up signals originating from the wellbore (10) are analyzed. During the analysis, vibration events that do not correlate with the emitted signal pattern (42) are filtered out. From the vibration events (43) that are among the picked-up signals and correlate with the emitted signal pattern (42) and from the time of travel since the radiation of the signal pattern (42), the location of the fluid depth (13) is deduced.

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