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Neutron logging tool having source and target with deuterium-tritium gas admixture

A logging tool and mixture technology, which are used in the field of neutron logging tools for exploration of geological formations and neutron porosity logging tools

Inactive Publication Date: 2009-04-29
PRAD RES & DEV LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of AmBe as a source material is no longer advisable due to safety concerns related to radioactive materials

Method used

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  • Neutron logging tool having source and target with deuterium-tritium gas admixture
  • Neutron logging tool having source and target with deuterium-tritium gas admixture
  • Neutron logging tool having source and target with deuterium-tritium gas admixture

Examples

Experimental program
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Embodiment Construction

[0028] specific implementation plan

[0029] Go to below image 3 , a schematic diagram of a logging tool 100 of a first embodiment can be seen. The first embodiment will be described in the context and context of a method and apparatus for making measurements of a geological formation 10 traversed by a borehole 12 . The logging tool (equipment or probe) 100 includes a pressure housing that encloses a neutron source (generator) 110, a first neutron detector 118 (optionally surrounded by an aluminum sleeve 119) and a second Neutron detectors 120, both neutron detectors are spaced from the neutron source. A tungsten neutron multiplier / deflector 122 is located between the neutron generator 110 and the detector. With the exception of the neutron source and multiplier / deflector, logging tool 100 is substantially as shown and described in Flaum, US Patent 4,794,792, the entire contents of which are incorporated herein by reference. Thus, in image 3 In an embodiment, the first ...

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PUM

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Abstract

An accelerator-based neutron tool is provided. The tool includes a deuterium-tritium gas mixture such that the tool outputs a desired ratio of 2.45 MeV and 14 MeV neutrons.

Description

technical field [0001] The present invention relates broadly to the hydrocarbon industry. More specifically, the present invention relates to neutron logging tools for exploring geological formations. The invention has particular application, but is not limited to, to accelerator-based neutron porosity tools. Background technique [0002] Conventional neutron porosity tools, such as the CNT (trademark of Schlumberger) tool or compensated neutron tool, detect these neutrons after neutrons emitted by a radioisotope-based neutron source pass through the formation of interest. neutron. The most common source of neutrons consists of radioactive americium combined with beryllium ( 241 Am) (or AmBe) composition. 241 The alpha particles emitted by Am react with the beryllium nucleus and emit a broad spectrum of neutrons spanning about 11 MeV, as shown in FIG. 1 . Due to its broad energy spectrum, several different transport processes are involved when neutrons scatter from an A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00G01V5/10
CPCG01V5/107G01T3/00
Inventor 肯尼思·E·斯蒂芬森约翰·B·菲茨杰拉德
Owner PRAD RES & DEV LTD