Method of through-casing gas detection

Details Method of through-casing gas detection Method of through-casing gas detection

2005-06-21

2005-06-21

Barlow, John (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Earth science

C703S005000

Reexamination Certificate

active

06909969

ABSTRACT:
A gas detection method includes carrying out respective neutron and density logs, using neutron and density detectors, along a length of well. The density log is corrected for the dimensions and properties of the well casing. The corrected density log is then combined with the neutron log to compensate for regions of artificially high density outside the casing. The compensated density log is continuously calibrated against the neutron log. The dynamically calibrated density and neutron logs are inspected for crossovers that signify the presence of gas in a formation.

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“The Dual-Spaced Density Log—Characteristics, Calibration and Compensation”, J.R. Samworth, The Log Analyst, Feb. 1992.

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