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A Fission Neutron Logging Correction Method

A fission neutron and well logging technology, which is applied in measurement, earthwork drilling, wellbore/well components, etc., can solve problems such as the influence of accurate calculation of uranium resources

Active Publication Date: 2016-08-10
核工业航测遥感中心
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

At present, there is no correction method for fission neutron logging, and the effective correction of fission neutron logging cannot be realized, which will affect the accurate calculation of uranium resources

Method used

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  • A Fission Neutron Logging Correction Method
  • A Fission Neutron Logging Correction Method
  • A Fission Neutron Logging Correction Method

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Embodiment Construction

[0048] A kind of fission neutron logging tool correction method of the present invention is introduced below in conjunction with accompanying drawing and embodiment:

[0049] Such as figure 1 As shown, a fission neutron logging tool calibration correction method, the specific steps are as follows:

[0050] Step 1. Obtain the corrected count rate of the neutron monitor in the measured wellbore

[0051] The neutron count rates S1 and S2 of the measured wellbore along the well axis and close to the borehole wall are respectively collected by the fission neutron instrument, and the neutron count rates S1 and S2 of the fission neutron instrument are respectively collected along the well axis and close to the borehole wall in the measured wellbore. The difference between the neutron count rates recorded by the two neutron monitors MON1 and MON2 △M 1 and ΔM 2 ; In the standard device of the fission neutron logging model, the neutron count rate difference ΔM recorded by the two neu...

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Abstract

The invention relates to a method for calibrating and correcting a fission neutron logging instrument. The neutron count rate by the well wall and along the well axis after water correction; 4. Obtain the neutron count rate by the well wall and along the well axis after the epithermal neutron life correction in the measured well; the present invention can directly measure the uranium content, and Compared with the chemical analysis results of hole core sampling, the deviation does not exceed 10%; the present invention reflects the grade of uranium ore more objectively, especially in the section where the balance of uranium and radium is destroyed, combined with conventional gamma logging, the drilling section can be determined on site The uranium-radium balance coefficient reduces the number of core samples and reduces the cost of uranium resource exploration; the invention can accurately measure the uranium leaching rate in in-situ leaching mining, and avoid environmental pollution and Waste of cost has important practical significance for improving the efficiency of in-situ leaching mining and smelting, reducing costs and protecting the environment.

Description

technical field [0001] The invention belongs to the technical field of nuclear and radiation environment monitoring and measurement, and in particular relates to a correction method for calculating the remaining uranium resources of a fission neutron logging instrument for uranium ore exploration reserves and in-situ leaching mining and smelting. Background technique [0002] Fission neutron logging technology belongs to the logging technology of direct uranium logging. This technology began in the 1970s, including prompt neutron logging technology and delayed neutron logging technology. By the mid-1970s, prompt neutron logging tools and delayed neutron logging tools had been widely used in uranium exploration in the world, and their sensitivity for detecting uranium was as high as 10 -4 g / g, reaching the lowest recoverable industrial grade for exploration of in-situ leachable sandstone-type uranium deposits. [0003] At present, gamma logging is often used for uranium reso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/00
Inventor 张积运江民忠管少斌胡明考李峰林张长兴王新兴周宗杰张家秋刘峰刘健王军高惠
Owner 核工业航测遥感中心
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