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Tritium-tritium neutron generator logging tool

A technology of neutron generators and neutron detectors, applied to instruments, measuring devices, scientific instruments, etc.

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 has fallen out of favor due to safety concerns associated with radioactive materials

Method used

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  • Tritium-tritium neutron generator logging tool
  • Tritium-tritium neutron generator logging tool
  • Tritium-tritium neutron generator logging tool

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Embodiment Construction

[0016] In accordance with the present invention, a neutron generator system is provided that uses substantially only T-T fusion reactions to generate neutrons for a neutron drilling tool. The T-T fusion reaction is T 3 1 + T 3 1 → n 1 0 + n 1 0 + H 4 2 e Q = 11.3 MeV. For the purposes of the description herein, the term "substantially only" means that at least 90% of all neutrons produced by the neutron generator are produced by T-T fusion reactions. Because the final state is a three-body system (one helium atom plus two neutrons), the kinetic energy of the neutrons can have values ​​ranging from very low energies to close to the reaction energy Q. In all case...

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Abstract

The present invention relates to a tritium-tritium neutron generator logging tool which comprises the following components: a casing; a neutron generator which is filled with tritium gas for causing that the neutrons generated by the neutron generator is only generated by a tritium-tritium fusion reaction basically; and at least one neutron detector which is separated with the neutron generator, wherein the neutron generator and at least one neutron detector are installed in the casing.

Description

technical field [0001] This invention relates broadly to the hydrocarbon industry. More specifically, the present invention relates to neutron logging tools useful in surveying geological formations. The present invention has particular application, although not limited to, in accelerator-based neutron porosity tools. Background technique [0002] Conventional neutron porosity tools, such as the CNT (trademark of Schlumberger) tool or the Compensated Neutron Tool, detect neutrons produced by radioisotope-based neutron sources after the neutrons have passed through the formation being investigated. emitted neutrons. The most common source of neutrons consists of radioactive americium bound to beryllium ( 241 Am), or 241 Am(Be). 241 The alpha (α) particles emitted by Am react with beryllium nuclei and emit neutrons with a wide energy spectrum (according to α (5.64MeV)+ 9 Be → 12 C+n(Q=+5.70MeV)), the spectrum spans slightly over 11MeV, see figure 1 . Because of its wi...

Claims

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Application Information

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IPC IPC(8): E21B49/00G01V5/10
CPCH05H3/06
Inventor 乔尔·L·格罗夫斯
Owner PRAD RES & DEV LTD