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US 8,076,634 B2Granted
Neutron shielding for downhole tool
AssigneeSchlumberger Technology Corporation
InventorChristian Stoller
Life of this patent
Estimating the term…
Abstract
A downhole tool for performing measurement of a formation. The tool comprising a housing surrounding a source for generating neutrons and a detector for detecting the neutrons. A shield is located outside of, or embedded in, the housing and focuses the neutrons.
Claims23
A downhole tool for performing measurement of a formation, the tool comprising:
- a housing, including a tool collar, having a source for generating neutrons and a detector for detecting the neutrons;
- and
- a shield for focusing the neutrons and located outside of, or embedded in, the housing, wherein the tool collar has a nonzero reduced thickness under at least a portion of the shield.
A downhole tool for performing measurement of a formation, the tool comprising:
- a housing, including a tool collar, having a source for generating neutrons and a detector for detecting the neutrons;
- an axial shield disposed between the source and the detector;
- an outer shield located outside of, or embedded in, the housing and around the source, the outer shield having an opening for focusing neutron flow in an azimuthal direction, wherein the tool collar has a nonzero reduced thickness under at least a portion of the outer shield.
A downhole tool for performing measurement of a formation, the tool comprising:
- a housing having a source for generating neutrons and a detector for detecting the neutrons;
- a first shield having an opening for an azimuthal focusing of the neutrons from outside of the tool to the detector;
- and
- a second shield having an opening for an azimuthal focusing of the neutrons from the source to outside of the tool, wherein the housing has a nonzero reduced thickness under at least a portion of the first or second shield.
1 more element
A method for focusing neutrons of a downhole tool measuring a formation, the method comprising:
- generating neutrons with a source located in a housing of the tool;
- detecting neutrons with a detector in the housing;
- focusing the neutrons with a shield, wherein the shield is located outside of, or embedded in, the housing;
- and
- facilitating the passage of neutrons by reducing a thickness of the housing under the shield to a nonzero value.
2 more elements
Dependencies are inferred from the claim text.