Method and apparatus for placing and interrogating downhole sensors
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United States of America Patent
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Jun 25, 2002
Grant Date -
N/A
app pub date -
Jul 17, 2000
filing date -
Jul 17, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method and system is shown to passively monitor cement integrity within a wellbore. Different types of sensors (pressure, temperature, resistivity, rock property, formation property etc.) are 'pumped' into place by placing them into a suspension in the cement slurry at the time a well casing is being cemented. The sensors are either battery operated, or of a type where external excitation, (EMF, acoustic, RF etc.) may be applied to power and operate the sensor, which will send a signal conveying the desired information. The sensor is then energized and interrogated using a separate piece of wellbore deployed equipment whenever it is desired to monitor cement conditions. This wellbore deployed equipment could be, for example, a wireline tool.
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