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US 10,241,226 B2Granted
Downhole gradiometric ranging 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 distance between a first and second well without any knowledge or involvement of the borehole or formation characteristics. 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, wherein the gradient field is measured in a radial direction along the downhole assembly.
Claims21
A method for downhole ranging, the method comprising:
- drilling a first wellbore, the first wellbore comprising 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 in a radial direction along the second wellbore;
- and
- utilizing the gradient field to thereby 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 radially positioned around an axis of the bottom hole assembly;
- 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;
- receiving the magnetic field utilizing the receivers, wherein a gradient field is measured in a radial direction along the bottom hole assembly;
- and
- utilizing the gradient field to thereby determine a distance between the first and second wellbores.
7 more elements
Dependencies are inferred from the claim text.