Boots – shoes – and leggings
Patent
1996-07-26
1998-07-14
McElheny, Jr., Donald E.
Boots, shoes, and leggings
324343, G06F 1900
Patent
active
057814368
ABSTRACT:
A method of measuring the conductivity of earth formations penetrated by a wellbore. The method comprises selectively passing an alternating current through transmitter coils inserted into the wellbore. Each of the transmitter coils has a magnetic moment direction different from the magnetic moment direction of the other ones of the transmitter coils. The alternating current includes a first and a second frequency. The amplitude at the first frequency has a predetermined relationship to the amplitude at the second frequency. The relationship corresponds to the first and the second frequencies. The method includes selectively receiving voltages induced in a receiver coil having a sensitive direction substantially parallel to the axis of the corresponding transmitter coil through which the alternating current is passed. A difference in magnitudes between a component of the received voltage at the first frequency and a component of the voltage at the second frequency is measured, and conductivity is calculated from the difference in magnitudes of the components of the received voltage at the two frequencies. In a preferred embodiment, the step of measuring the difference in magnitudes between the voltage components at the two frequencies includes extracting digital signal samples of the received voltage at predetermined times with respect to a cycle of the transmitter current at the first frequency.
REFERENCES:
patent: 3893021 (1975-07-01), Meador et al.
patent: 4302723 (1981-11-01), Moran
patent: 4451789 (1984-05-01), Meador
patent: 4499421 (1985-02-01), Sinclair
patent: 4965522 (1990-10-01), Hazen et al.
patent: 5065100 (1991-11-01), Vail, III
patent: 5389881 (1995-02-01), Bittar et al.
patent: 5508616 (1996-04-01), Sato et al.
patent: 5530358 (1996-06-01), Wisler et al.
patent: 5548219 (1996-08-01), Sinclair
patent: 5585790 (1996-12-01), Luling
patent: 5666057 (1997-09-01), Beard et al.
Tabarovsky, L.A., Epov, M.I., Geometric and Frequency Focusing in Exploration of Anisotropic Seams, Nauka, USSR Academy of Sciences, Siberian Division, Novosibirsk, pp. 67-129 (1972).
Fanini Otto N.
Forgang Stanislav
Tabarovsky Leonty A.
Fagin Richard A.
McElheny Jr. Donald E.
Western Atlas International Inc.
LandOfFree
Method and apparatus for transverse electromagnetic induction we 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 transverse electromagnetic induction we, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for transverse electromagnetic induction we will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1889154