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US 10,520,628 B2Granted
Downhole gradiometric ranging for T-intersection and well avoidance utilizing transmitters and receivers having magnetic dipoles
AssigneeHalliburton Energy Services, Inc.
InventorsBurkay Donderici, Baris Guner
Life of this patent
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Abstract
A ranging system utilizes gradiometric data to determine the direction to and distance between a first and second well without any knowledge or involvement of the borehole or formation characteristics in order to intersect and/or avoid the second well. In general, this is achieved by deploying a downhole assembly comprising transmitters and receivers having magnetic dipoles, along with bucking receivers positioned between the transmitters and receivers.
Claims25
A method for downhole ranging, the method comprising:
- drilling a first wellbore, the first wellbore comprises an elongated conductive body;
- deploying at least two magnetic dipole transmitters and at least four magnetic dipole receivers in a second wellbore, the receivers comprising main and bucking receivers;
- using the bucking receivers, eliminating a direct signal emitted from the transmitter;
- using an electric field generated by the transmitters, inducing a current along the first wellbore that results in a magnetic field being emitted from the first wellbore, wherein the induced current flows in a same axial direction throughout the first wellbore;
- receiving the magnetic field utilizing the receivers, wherein a gradient field is measured using the magnetic field received by the main and bucking receivers;
- and
- utilizing the gradient field to determine a distance between the first and second wellbores.
4 more elements
A downhole ranging assembly, comprising:
- at least two magnetic dipole transmitters positioned along a bottom hole assembly;
- at least four magnetic dipole receivers comprised of main and bucking receivers symmetrically positioned around the axis of the bottom hole assembly;
- and
- processing circuitry coupled to the transmitter and receivers to perform an operation comprising:
- using an electric field generated by the transmitters, inducing a current along the target wellbore that results in a magnetic field being emitted from the target wellbore, wherein the induced current flows in a same axial direction throughout the first wellbore;
- receiving the magnetic field utilizing the receivers, wherein a gradient field is measured using the magnetic field received by the main and bucking receivers;
- and
- utilizing the gradient field to determine a distance between the first and second wellbores.
5 more elements
Dependencies are inferred from the claim text.