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Neutron spectral well logging system

An energy spectrum logging and neutron technology, which is applied in measurement devices, geophysical measurements, nuclear radiation exploration, etc., can solve problems such as binding logging operations, restricting sub-source production, etc. Effects of improved characteristics and reduced geometry factor

Active Publication Date: 2006-09-27
HTA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

but 241 Am raw materials are not available worldwide, severely restricting 241 Production of Am / Be neutron sources, thereby constraining logging operations

Method used

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  • Neutron spectral well logging system
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Examples

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Embodiment 1

[0018] A neutron spectrum logging system includes a probe 4 and a data acquisition and processing unit 1 . In the probe tube 4, from front to back, there are 137 Cs source 5, 238 Pu-Be neutron source 6, shielding body 7, NaI(T1)γ detector 2, Li glass neutron detector 3; NaI(T1)γ detector 2, Li glass neutron detector 3 and ground data acquisition and processing unit 1; wherein, the neutron source 6 is an activity of 4Ci 238 Pu / Be. The system can be used for drilling fixed-point and continuous scanning measurement.

[0019] used in this example 238 The Pu / Be neutron source is produced by the following process: the powdered 238 PuO 2 After dissolving, it is mixed with metal Be powder at a ratio of 1:3 by weight, and then processed according to conventional metallurgical methods such as dissolution, precipitation, and drying, and then compression molded.

Embodiment 2

[0021] A kind of neutron energy spectrum logging system, the structure is identical with that described in embodiment 1, and its difference is that the neutron source 6 used is that the activity is 16Ci 238 Pu / Be neutron source, and the weight ratio is 1:7 238 PuO 2 and Be powder are prepared through the same operation as in Example 1.

Embodiment 3

[0023] A kind of neutron energy spectrum logging system, the structure is identical with that described in embodiment 1, and its difference is that the neutron source 6 used is that activity is 28Ci 238 Pu / Be neutron source, and the weight ratio is 1:10 238 PuO 2 and Be powder are prepared through the same operation as in Example 1.

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Abstract

This invention relates to a neutron spectral well logging system. Wherein, it comprises a probe (4) with 238Pu-Be neutron source of 4~28Ci activity prepared by dissolving, depositing and drying the 1:3~10 238PuO2 and Be, and a data acquisition and process unit (1). This invention replaces 241Am / Be without additional cost for wide application.

Description

technical field [0001] The invention belongs to the technical field of exploration and detection using nuclear radiation, and in particular relates to a neutron energy spectrum logging system. Background technique [0002] Neutron logging is the use of neutrons to interact with the surrounding rocks and materials in the well to detect the chemical elements and content of the formation rocks and their interstitial fluids, providing a basis for searching for oil, coal, metal and non-metal minerals. The neutron penetration is great, neutron logging can explore the original strata around the borehole under drilling conditions, and quickly analyze the lithology, structural form, composition and mineral resource distribution of the stratum without sampling. In order to shorten the measurement time and improve the measurement accuracy, the neutron source should have sufficient strength, 241 Am / Be and 252 Cf neutron source is a commonly used isotopic neutron source for well loggin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V5/10G01V5/06G01V5/04
Inventor 简利民温忠明孙玉华张栋栗福增刘志国杨新
Owner HTA CO LTD
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