Radial profiling of slowness: methods and apparatus for near-wellbore alteration estimation
AssigneeSchlumberger Technology Corporation
InventorsSmaine Zeroug, Henri-Pierre Valero, Sandip Bose
Life of this patent
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Abstract
Methods and apparatus facilitating radial profiling of acoustic slowness of a formation traversed by a borehole are disclosed. According to some aspects of the invention, a radial slowness profile is imaged, including an image of altered region slowness.
Claims39
A method of logging an earth formation surrounding a borehole, comprising:
- providing a logging device that is moveable through the borehole;
- transmitting sonic energy into the formation and receiving, at a plurality of transmitter-to-receiver spacings on the logging device, sonic energy that has traveled through the formation, and producing signals representative of the received sonic energy for the plurality of transmitter-to-receiver spacings;
- and
- providing a continuous radial profile image of formation slowness.
A method of logging an earth formation surrounding a borehole, comprising:
- providing a logging device that is moveable through the borehole;
- transmitting sonic energy into the formation and receiving, at a plurality of transmitter-to-receiver spacings on the logging device, sonic energy that has traveled through the formation;
- and
- providing a 2D image of formation slowness in an altered radial zone of the formation.
A method of profiling a formation traversed by a borehole, comprising:
- logging near borehole formation slowness;
- logging far field formation slowness;
- and
- logging intermediate formation slowness as a function of radius.
An apparatus for logging a formation traversed by a borehole, comprising:
- a body;
- a plurality of transmitters transmitting sonic energy into the formation;
- a plurality of receivers spaced from the plurality of transmitters for receiving, at a plurality of transmitter-to-receiver spacings on the body, sonic energy that has traveled through the formation;
- and
- a set of instructions that, when executed, provide a 2D image of formation slowness of an altered radial zone of the formation.
A method of logging an earth formation surrounding a borehole, comprising:
- providing a logging device that is moveable through the borehole;
- transmitting sonic energy into the formation and receiving, at a plurality of transmitter-to-receiver spacings on the logging device, sonic energy that has traveled through the formation;
- and
- providing a 3D image of near, far, and intermediate formation slowness.
Dependencies are inferred from the claim text.