Downhole anisotropy inversion for look ahead detection during drilling
AssigneeHalliburton Energy Services, Inc.
InventorsJin Ma, Clint Lozinsky
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Abstract
A method comprises determining an anisotropy ratio of at least one property of a subsurface formation ahead of a drill bit relative to a direction that the drill bit is drilling a wellbore in the subsurface formation. The method comprises inverting the anisotropy ratio and predicting a formation characteristic of the subsurface formation that is ahead of the drill bit based on the inverted anisotropy ratio.
Claims20
A method comprising:
- determining an anisotropy ratio of at least one property of a subsurface formation ahead of a drill bit relative to a direction that the drill bit is drilling a wellbore in the subsurface formation;
- inverting the anisotropy ratio;
- and
- predicting a formation characteristic of the subsurface formation that is ahead of the drill bit based on the inverted anisotropy ratio.
A system comprising:
- a transmitter, that is part of a bottomhole assembly of a drill string that includes a drill bit and that is to be positioned in a wellbore formed in a subsurface formation, configured to emit an electromagnetic signal into the subsurface formation;
- a receiver, that is part of the bottomhole assembly, configured to receive the electromagnetic signal after the electromagnetic signal traverses the subsurface formation;
- a processor;
- and
- a non-transitory machine-readable media including computer-executable instructions that cause the processor to perform operations, the instructions comprising,
- instructions to determine, based on the electromagnetic signal received by the receiver, an anisotropy ratio of at least one property of the subsurface formation ahead of the drill bit relative to a direction that the drill bit is drilling the wellbore in the subsurface formation;
- instructions to invert the anisotropy ratio;
- and
- instructions to predict a formation characteristic of the subsurface formation that is ahead of the drill bit based on the inverted anisotropy ratio.
One or more non-transitory machine-readable media including computer-executable instructions that cause one or more processors to perform operations, the instructions comprising:
- instructions to determine an anisotropy ratio of at least one property of a subsurface formation ahead of a drill bit relative to a direction that the drill bit is drilling a wellbore in the subsurface formation;
- instructions to invert the anisotropy ratio;
- and
- instructions to predict a formation characteristic of the subsurface formation that is ahead of the drill bit based on the inverted anisotropy ratio.
Dependencies are inferred from the claim text.