Measuring and testing – Borehole or drilling – Downhole test
Patent
1996-12-16
1998-05-19
Williams, Hezron E.
Measuring and testing
Borehole or drilling
Downhole test
7315202, 324326, 324338, 166250, 166255, G01V 500, E21B 43119
Patent
active
057538131
ABSTRACT:
Method and an apparatus for determining a vertical distance between a first marker and a second marker embedded in a formation traversed by a borehole so as to quantify the occurrence of earth layer compaction or subsidence. The markers are implanted within a formation and their relative position is monitored over time to detect the presence of formation subsidence and compaction. A tool having three or more detectors adapted to sense signals emitted from the markers is positioned proximate the markers, where the detectors are separated from each other by a known vertical spacing. The tool is positioned at least at three elevations such that a reference elevation of a reference portion of the tool is determined when (a) the first detector detects a signal emitted from the first marker, (b) the second detector senses a signal emitted from the second marker, and (c) the third detector detects a signal emitted from one of the markers. The distance between the two markers may be determined by evaluating a relation that includes the product of a term and a correction factor, the term and the correction factor each being a function of at least two of the reference elevations.
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Halliburton Energy Service,s Inc.
Hood Jeffrey C.
McClellan Doug
Wiggins J. David
Williams Hezron E.
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