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US 6,285,026 B1Granted
Borehole caliper derived from neutron porosity measurements
AssigneeSchlumberger Technology Corporation
InventorsMichael L. Evans, David L. Best
Life of this patent
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AssigneeSchlumberger Technology Corporation
InventorsMichael L. Evans, David L. Best
Estimating the term…
A system for measuring the size of a borehole penetrating an earth formation is disclosed. The system uses a neutron source and a least one neutron detector. The neutron detector responds primarily to the composite hydrogen content of material within the borehole and formation upon irradiation by the neutron source. A partition response function is used to delineate the portion of the detector response resulting from borehole and from the formation. Since the detector response from the borehole can be isolated using the partition function and the hydrogen content of the borehole fluid is generally known, the size of the borehole can be determined from borehole response portion of the composite detector response if combined with a neutron porosity measurement of the formation. The neutron porosity measurement can be obtained independently, or by combining the neutron detector response with the response of a second neutron detector at a different axial spacing from the neutron source. The system is applicable in both logging-while-drilling and wireline logging operations.
A method for determining the size of a borehole penetrated material, comprising:
A method for determining the size of a borehole penetrating an earth formation, comprising:
A system for determining the size of a borehole penetrating an earth formation, comprising:
Dependencies are inferred from the claim text.