A method for use in or for detecting a downhole feature in a well comprises transmitting an electromagnetic signal from a first position located substantially at or adjacent to surface through a first space to the downhole feature. The method further comprises receiving an electromagnetic signal at a second position located substantially at or adjacent to surface after reflection of the transmitted electromagnetic signal from the downhole feature and after propagation of the reflected electromagnetic signal through a second space. The method may comprise sealing the well before transmitting the electromagnetic signal. Such a method may be used to detector determine a distance from surface to a downhole feature such as a fluid interface in a completed production, injection or observation well.
申请公布号
WO2014199179(A2)
申请公布日期
2014.12.18
申请号
WO2014GB51836
申请日期
2014.06.13
申请人
WELLDATA (SUBSURFACE SURVEILLANCE SYSTEMS) LTD.
发明人
LITTLEFORD, SYDNEY JOSEPH;GARDINER, CHRISTOPHER KIM;SHEPHERD, DUNCAN PAUL