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Neutron spectral well logging system

A technology of energy spectrum logging and neutrons, which is applied in the direction of measuring devices, geophysical measurements, and nuclear radiation exploration, can solve the problems of restricting logging operations and restricting the production of sub-sources, and achieve the reduction of the physical volume and geometry of the source core. The effect of characteristic improvement and reduction of geometry factor

Active Publication Date: 2009-10-21
HTA CO LTD
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  • 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
  • Neutron spectral well logging system

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

A neutron energy spectrum logging system belongs to the technical field of exploration and detection by using nuclear radiation. This system comprises probe tube (4) and data acquisition and processing unit (1), and the neutron source used in its probe tube is 238Pu-Be neutron source by weight ratio is 1: 3~10238PuO2 and Be powder dissolve, precipitate , dried, and its activity is 4 to 28 times. The use of new neutron sources not only solves the problem of shortage of 241Am / Be neutron sources, but also does not increase the cost of neutron logging. The well logging system of the invention can be widely used in well logging operations.

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 formation rocks and their interstitial fluids, providing a basis for searching for oil, coal, metal and non-metal minerals. The penetration of neutrons is large, and neutron logging can explore the original formations around the drilling holes under drilling conditions, and quickly analyze the lithology, structural form, composition, and mineral resource distribution of the formations 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 sour...

Claims

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Application Information

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Patent Type & Authority Patents(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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