Electromagnetic measurements in a curved wellbore
AssigneeSchlumberger Technology Corporation
InventorMark Frey
Life of this patent
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Abstract
A method for making electromagnetic logging measurements in a curved section of a subterranean wellbore includes rotating an electromagnetic logging tool (including at least one transmitter and at least one receiver) in the curved section of the wellbore. A curvature value of the curved section of the wellbore is obtained and processed in combination (e.g., via an inversion algorithm) with the electromagnetic measurements to compute at least one property of a formation surrounding the wellbore.
Claims20
A method for making electromagnetic logging measurements in a curved section of a subterranean wellbore, the method comprising:
- (a) rotating an electromagnetic logging tool in the curved section of the wellbore, the electromagnetic logging tool including at least one transmitter spaced apart from at least one receiver;
- (b) causing the electromagnetic logging tool to make electromagnetic logging measurements while rotating in (a);
- (c) obtaining a curvature of the curved section of the wellbore;
- and
- (d) processing the electromagnetic measurements made in (b) in combination with the curvature obtained in (c) to compute at least one property of a formation surrounding the wellbore.
A system for making electromagnetic measurements in a curved section of a subterranean wellbore, the system comprising:
- at least one transmitter spaced apart from at least one receiver on a drill string, the transmitter and receiver configured to make electromagnetic measurements while the drill string rotates in the wellbore;
- and
- a processor configured to:
- receive a curvature estimate of the curved section of the wellbore;
- and
- process electromagnetic measurements made by the transmitter and the receiver in combination with the received curvature to compute at least one property of a formation surrounding the wellbore.
Dependencies are inferred from the claim text.