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US 2015/0091577 A1Published application
Downhole gradiometric ranging for t-intersection and well avoidance utilizing transmitters & receivers having magnetic dipoles
AssigneeHalliburton Energy Services, Inc.
InventorsBurkay Donderici, Baris Guner
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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.
Claims26
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;
- inducing a current along the first wellbore using the transmitters that results in a magnetic field being emitted from the first wellbore;
- receiving the magnetic field utilizing the receivers, wherein a gradient field is measured;
- and
- utilizing the gradient field to determine a distance between the first and second wellbores.
3 more elements
A downhole ranging assembly, comprising:
- a bottom hole assembly comprising at least two magnetic dipole transmitters and at least four magnetic dipole receivers;
- and
- processing circuitry to implement a method comprising:
- inducing a current along a first wellbore using the transmitters that results in a magnetic field being emitted from the first wellbore and toward a second wellbore, the first wellbore comprising an elongated conductive body;
- receiving the magnetic field utilizing the receivers, wherein a gradient field is measured;
- and
- utilizing the gradient field to determine a distance between the first and second wellbores.
4 more elements
Dependencies are inferred from the claim text.