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    • 27. 发明专利
    • Device and method for measurement by guided waves on a metal string in a well
    • GB2355808A
    • 2001-05-02
    • GB0100779
    • 1999-06-17
    • NORSKE STATS OLJESELSKAPNORGES GEOTEKNISKE INST
    • KONG FAN-NIANWESTERDAHL HARALDEIDESMO TERJEELLINGSRUD SVEIN
    • G01V3/30
    • Device for detection of changes of resistivity or dielectrical properties due to changes of fluid compositions in the near-well area 0-500 m about a well (1) in a geological formation (9), comprising an electrically conductive tubing string (4), e.g. a liner pipe or an other fixedly arranged tube or openhole completion in the well (1). The characteristic by the invention is: a) an electrical energy source (24): b) a signal generator (22) for generation of electromagnetic signals (25) to; c) at least one transmitter antenna (2) for electromagnetic waves (26), arranged preferably above an oil/water contact, on a fixed first position on the tubing string (4), and arranged for essentially to guide the electromagnetic waves along the tubing string (4); d) one or more receiver antennas (8 1 , 8 2 , .., 8 n ) for guided electromagnetic waves along the tubing string (4), arranged on other fixed positions along the tubing string (4): e) devices (80) for receiving of signals (85 1 , 85 2 , .. 85 n ) induced in the receiver antennas (8 1 , 8 2 , .., 8 n ) due to wave impedance gradients along the tubing string (4) in rocks or fluids in the geological formation (9) and in the electrically conductive tubing string (4); f) signal processing means (82) for processing of the received signals (85 1 , 85 2 , .., 85 n ); g) communication devices (100, 200) for transmission of signals (105) representing the electrical signals (85 1 , 85 2 , ... 85 n ), and for receiving control signals (205).