Well collar identification method
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United States of America Patent
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May 5, 1998
Grant Date -
N/A
app pub date -
Mar 29, 1996
filing date -
Mar 29, 1996
priority date (Note) -
Expired
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Abstract
A well collar counting methodology is provided comprising first obtaining acoustic pulse data from a well and then digitizing and storing the amplitude-versus-time signal for subsequent processing. The raw signal is processed by applying a Wavelet Transform thereto for producing multiple resolutions of the signal, preferably four, at least one of which has a transformed signal resolution sufficient to distinguish reflections emanating from collars, and one of the coarser resolutions having a transformed signal resolution sufficient to distinguish reflections emanating from the fluid surface as kicks. The fluid surface kick and repeat kicks are determined by performing multi-resolutional analysis of each maximum, at the coarser resolution, as synchronized against the successively finer resolutions and compared as being significant with respect to adjacent maximums. Tubing collars are then counted at a finer resolution, as being reflection maximums counted in the interval between the wellhead and the kick, irrespective of tubing joint length or collar frequency. Direct collar counting, interpolation and extrapolation of collars is performed.
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