Highly integrated logging tool
First Claim
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1. An apparatus for logging a formation traversed by a borehole, comprising:
- a plurality of logging tools adapted for conveyance inside the borehole, the plurality of logging tools comprising;
a tool body;
a sensing pad responsive to a density property of the formation coupled to the tool body;
a current emitting measure electrode responsive to a lateral resistivity property of the formation incorporated on the sensing pad;
a mechanism coupled to the tool body for urging the sensing pad into contact with a side of the borehole coupled to the tool body; and
a pair of mass isolation bands disposed about the tool body to isolate a mass of the tool body adjacent the measure electrode and enable the tool body mass to function as a bucking electrode, wherein a first mass isolation band of the pair of mass isolation bands is disposed at a position on the tool body above the sensing pad and a second mass isolation band of the pair of mass isolation bands is disposed at a position on the tool body below the sensing pad.
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Abstract
An apparatus for logging a formation traversed by a borehole includes a plurality of logging tools adapted for conveyance inside the borehole. The plurality of logging tools includes a tool body, a sensing pad responsive to a density property of the formation coupled to the tool body, a current emitting measure electrode responsive to a lateral resistivity property of the formation incorporated on the sensing pad, a mechanism for urging the sensing pad in contact with a side of the borehole coupled to the tool body, and a pair of mass isolation bands disposed about the tool body to isolate a mass of the tool body adjacent the measure electrode.
62 Citations
17 Claims
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1. An apparatus for logging a formation traversed by a borehole, comprising:
a plurality of logging tools adapted for conveyance inside the borehole, the plurality of logging tools comprising; a tool body; a sensing pad responsive to a density property of the formation coupled to the tool body; a current emitting measure electrode responsive to a lateral resistivity property of the formation incorporated on the sensing pad; a mechanism coupled to the tool body for urging the sensing pad into contact with a side of the borehole coupled to the tool body; and a pair of mass isolation bands disposed about the tool body to isolate a mass of the tool body adjacent the measure electrode and enable the tool body mass to function as a bucking electrode, wherein a first mass isolation band of the pair of mass isolation bands is disposed at a position on the tool body above the sensing pad and a second mass isolation band of the pair of mass isolation bands is disposed at a position on the tool body below the sensing pad. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus for logging a formation traversed by a borehole, comprising:
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a tool body adapted for conveyance inside the borehole; a sensing pad responsive to a density property of the formation coupled to the tool body; a current emitting measure electrode responsive to a lateral resistivity property of the formation incorporated on the sensing pad; and a mechanism coupled to the tool body for urging the sensing pad into contact with a side of the borehole; and a pair of mass isolation bands disposed about the tool body to isolate a mass of the tool body adjacent the measure electrode and enable the tool body mass to function as a bucking electrode, wherein a first mass isolation band of the pair of mass isolation bands is disposed at a position on the tool body above the sensing pad and a second mass isolation band of the pair of mass isolation bands is disposed at a position on the tool body below the sensing pad. - View Dependent Claims (14, 15, 16)
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17. A method of logging a formation traversed by a borehole, comprising:
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disposing in the borehole a tool body carrying a sensing pad responsive to a density property and lateral resistivity property of the formation; moving the tool body in the borehole while urging the sensing pad in contact with a side of the borehole; emitting a current from a measure electrode incorporated on the sensing pad; measuring flow of the current into the formation, wherein the flow of the current is indicative of to the lateral resistivity of the formation; and emitting gamma radiation from a gamma source incorporated in the sensing pad; and detecting gamma particles returning from the formation, wherein energies of the gamma particles are proportional to the density property; and focusing the flow of current from the measure electrode in a direction generally perpendicular to the tool using an isolated mass of the tool body confined by a pair of mass isolation bands, wherein a first mass isolation band of the tool body above the sensing pad and a second mass isolation band of the pair of mass isolation bands is disposed at a position on the tool body below the sensing pad.
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Specification