Determination of borehole geometry inside cased wells with crosswell electromagnetics
AssigneeSchlumberger Technology Corporation
InventorsEldad Haber, Ping Zhang
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Abstract
A method is disclosed for locating a receiver in a borehole having a conductive liner by inducing an electromagnetic field from a transmitter in a first borehole, detecting at a first location by at least one receiver located in a second borehole having a conductive liner, a first electromagnetic field induced by the transmitter, detecting at a second location by the at least one receiver, a second electromagnetic field induced by the transmitter and calculating a set of geometry coordinates for the first location based on the first electromagnetic field and the second electromagnetic field.
Claims5
A method for mapping a trajectory of a cased wellbore traversing an earth formation, the method comprising:
- inducing a first magnetic field at a first position in a wellbore;
- detecting a first response to the induced first magnetic field at a second position in the wellbore;
- detecting a second response to the induced first magnetic field at a third position in the wellbore;
- repeating the inducing and detecting steps over a range of wellbore depths;
- calculating a set of geometry coordinates defining a trajectory of the wellbore based on the detected responses.
Dependencies are inferred from the claim text.