Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent
1995-06-07
1997-10-28
O'Shea, Sandra L.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
364422, G01V 326, G06G 776
Patent
active
056820992
ABSTRACT:
A logging apparatus is provided for use in a wellbore for measuring an attribute of at least one of the wellbore and a surrounding formation, when coupled to a wellbore tubular expended in the wellbore. The logging apparatus includes a housing, at least one transmitter, and at least one receiver. The transmitter is carried by the housing and is individually and selectively operable for producing electromagnetic interrogating signal at selected interrogation frequency for passage to the wellbore and surrounding formation. The receiver is carried by the housing in a selected position relative to the transmitter, and is tuned to receive electromagnetic signals at the interrogation frequency to the exclusion of other frequencies. A portion of at least one of the wellbore, and surrounding formation has an attribute value which can be derived from at least one of amplitude attenuation of electromagnetic interrogating signal as determined from measurements of the electromagnetic interrogating signals taken through the receiver, and phase shift of electromagnetic interrogating signal as determined from measurements from electromagnetic signal taken through the receiver. The apparatus further includes means for sampling signals from the receiver or receivers at a sampling frequency which is less than the interrogation frequency. A controller member is provided for selectively energizing the transmitters and for selectively obtaining measurements of the electromagnetic interrogating signal with the receivers, and determining an accurate measure of the attribute value.
REFERENCES:
patent: 4455529 (1984-06-01), Sinclair
patent: 4499422 (1985-02-01), Sinclair
patent: 4514809 (1985-04-01), Johnson, Jr. et al.
patent: 4720681 (1988-01-01), Sinclair
patent: 4968940 (1990-11-01), Clark et al.
Schneider David Mark
Thompson Larry W.
Wisler Macmillan M.
Baker Hughes Incorporated
O'Shea Sandra L.
Phillips Roger
LandOfFree
Method and apparatus for signal bandpass sampling in measurement does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for signal bandpass sampling in measurement, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for signal bandpass sampling in measurement will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1028345