Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Including borehole fluid investigation
Reexamination Certificate
2004-03-19
2008-11-18
Whittington, Kenneth J (Department: 2862)
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
Including borehole fluid investigation
C324S337000
Reexamination Certificate
active
07453265
ABSTRACT:
A device for monitoring the position of an oil/water contact (OWC,22) between an oil-continuous fluid (2o) overlying a water-continuous fluid (2w) inside a casing pipe (7). The device includes a transmitter (5) for a generating an electromagnetic signal (ST) and the transmitter (5) is provided with electrical energy (GT) from a voltage signal generator (G). The transmitter (5) is arranged inside the casing pipe (7) in the oil-continuous fluid (2o) and above the oil-water contact (22). The electromagnetic wave signal (ST) partly propagates downwards from the transmitter (5), is partly reflected from the oil-water contact (22), and is partly reflected by the end of the casing, giving rise to an upward propagating, reflected electro-magnetic signal (SR). The device also includes a sensor (6) for detecting the reflected electromagnetic signal (SR), and the sensor (6) is also arranged above the oil-water contact (22), providing a sensor signal (RR) to a receiver (60) for receiving the sensor signal (RR) and further to an analyzing device (61) for analyzing the sensor signal (RR), e.g. with respect to two-way propagation time or amplitude in order to calculate an elevation level for the oil-water contact.
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Johnstad Svein Erling
Kong Fan-Nian
Westerdahl Harald
Norsk Hÿdro ASA
Wenderoth , Lind & Ponack, L.L.P.
Whittington Kenneth J
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