A device for monitoring of oil-water interface

摘要

A device for monitoring the position of an oil/water contact (OWC, 22 ) between an oil-continuous fluid ( 2 o) overlying a water-continuous fluid ( 2 w) 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 (GSUBT/SUB) from a voltage signal generator (G). The transmitter ( 5 ) is arranged inside the casing pipe ( 7 ) in the oil-continuous fluid ( 2 o) and above the oil-water contact ( 22 ). The electromagnetic wave signal (SSUBT/SUB) 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 (SSUBR/SUB). The device also includes a sensor ( 6 ) for detecting the reflected electromagnetic signal (SSUBR/SUB), and the sensor ( 6 ) is also arranged above the oil-water contact ( 22 ), providing a sensor signal (RSUBR/SUB) to a receiver ( 60 ) for receiving the sensor signal (RSUBR/SUB) and further to an analyzing device ( 61 ) for analyzing the sensor signal (RSUBR/SUB), e.g. with respect to two-way propagation time or amplitude in order to calculate an elevation level for the oil-water contact.