Boots – shoes – and leggings
Patent
1996-03-29
1998-05-05
McElheny, Jr., Donald E.
Boots, shoes, and leggings
G06F 1900
Patent
active
057484716
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.
REFERENCES:
patent: 2232476 (1941-02-01), Ritzmann
patent: 4318298 (1982-03-01), Godbey et al.
patent: 4318674 (1982-03-01), Godbey et al.
patent: 4793178 (1988-12-01), Ahem et al.
patent: 4853901 (1989-08-01), Barber
patent: 5200894 (1993-04-01), McCoy et al.
Related Positive Time-Frequency Energy Distributions, by Dorize, C. and Gram-Hansen, K., Wavelets and Applications, Meyer, Y. Ed. Proceedings of the Int'l Conf., Marseille, France, May, 1989.
Wavelet Maxima Representation, by Mallat, S. and Zhong, S., Wavelets and Applications, Meyer, Y. Ed. Proceedings of the Int'l Conf., Marseille France, May, 1989.
Orthonormal Bases of Compactly Supported Wavelets, Comm. Pure Appl. Math., vol. 41, 1988, pp. 906-966 by Ingrid Daubechies.
A Theory for Multiresolution Signal Decomposition: The Wavelet Representation, IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. II, Nov. 7, pp. 674-693, Jul., 1989, by Stephane Mallat .
McElheny Jr. Donald E.
Otatco Inc.
LandOfFree
Well collar identification method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Well collar identification method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Well collar identification method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-61448