Preparation method of sealing type gamma ray source

A gamma ray, sealed technology, used in radioactive sources, nuclear radiation exploration, instruments, etc., can solve problems such as economic losses, and achieve the effects of less environmental pollution, reduced losses, and easy availability of raw materials

Active Publication Date: 2012-04-18
河南省同新科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once the salvage fails, the well has to be closed in the end, which will bring huge economic losses to both oil production and well logging

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In a radiation protection glove box equipped with a radioactive gas filter: dissolve with 0.5 mol / L perchloric acid 131 BaCO 3 Make a solution with a specific activity of 10mCi / ml, take 3ml 131 BaCO 3 solution, transfer it into the source container, into the source container 131 BaCO 3 The total activity of the solution is 30mCi, the pH value of the solution is adjusted to 7 with sodium hydroxide solution, and 0.002mol of precipitant sodium sulfate is added to precipitate out 131 BaSO 4 , heat and dry at 60°C, cool to room temperature, seal the source container and make it 131 Ba-sealed gamma-ray source. Wherein, the source storage container can be installed on a radioactive density logging densitometer, and its external dimensions and 137 The Cs density source storage container has the same external dimensions and is reusable, with a temperature resistance of 180 degrees and a pressure resistance of 140 MPa.

Embodiment 2

[0023] In a radiation protection fume hood equipped with radioactive gas filtering equipment: dissolve with 3mol / L perchloric acid 131 BaCO 3 Make a solution with a specific activity of 200mCi / ml, take 0.25ml 131 BaCO 3 solution, transfer it into the source container, into the source container 131 BaCO 3 The total activity of the solution is 50mCi, the pH value of the solution is adjusted to 7 with potassium hydroxide solution, and the precipitant potassium sulfate of 0.007mol is added to precipitate out 131 BaSO 4 , heat and dry at 80°C, cool to room temperature, seal the source container and make it 131 Ba-sealed gamma-ray source. The source storage container can be installed on the radioactive density logging densitometer, and its external dimensions and 137 The Cs density source-storage container has the same external dimensions and is reusable, with a temperature resistance of 185 degrees and a pressure resistance of 145 MPa.

Embodiment 3

[0025] In a radiation protection glove box equipped with radioactive gas filtering equipment: dissolve with 5mol / L hydrochloric acid 131 BaCO 3 Make a solution with a specific activity of 70mCi / ml, take 1ml 131 BaCO 3 solution, transfer it into the source container, into the source container 131 BaCO 3 The total activity of the solution is 70mCi, the pH of the solution is adjusted to be neutral with sodium hydroxide solution, and 0.01mol of precipitating agent magnesium sulfate is added to precipitate out 131 BaSO 4 , heat and dry at 100°C and directly seal the source container 131 Ba-sealed gamma-ray source. Wherein, the source storage container can be installed on a radioactive density logging densitometer, and its external dimensions and 137 The Cs density source-storage container has the same external dimensions and is reusable, with a temperature resistance of 190 degrees and a pressure resistance of 150 MPa.

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PUM

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Abstract

The invention discloses a preparation method of a sealing type gamma ray source in a radioactive density meter, which belongs to the technical field of radioactive well logging. The method comprises the following steps: transferring isotopic elements into a source storage container in a state of a water solution of compounds thereof; controlling the total activity of the water solution of the isotopic element compounds in the source storage container between 30 and 70 mCi; adding water-soluble precipitating agents for precipitating compounds containing the isotopic elements; and sealing the source storage container in a sealed way after heating and drying to obtain the sealed type gamma ray source, wherein the half life of the isotopic elements is shorter than 60 days, in addition, a gamma ray with the energy between 0.1 and 1.4 Mev can be released through the disintegration, and at the same time, the disintegration mode accounts for 40 percent of the total disintegration of the isotopic elements. The gamma ray energy of the sealing type gamma ray source prepared by the invention is in the radioactive density meter sensing range in common use in the well logging, the half life is short, the environment pollution is little, the sealing type gamma ray source can directly replace the original 137 Cs density source on the radioactive density meter, and at the same time, the invention has the advantages of simplicity and easy implementation of production process, easy acquisition of raw materials and low cost, and has wide market potential.

Description

technical field [0001] The invention belongs to the technical field of radioactivity logging, and in particular relates to a preparation method of a sealed gamma ray source in a radiodensity meter. Background technique [0002] Production profile logging in oil production is an important method to understand the fluid production state of downhole formations. Radioactive density logging is the most commonly used technology. The key equipment used is the radioactive density meter, which has high stability. 137 The Cs density source is a long-term used gamma ray source in production logging. 137 The half-life of the Cs density source is long (30.17 years). Once the density source falls into the well, in order to prevent environmental pollution and further expansion of the accident, the instrument must be salvaged. Since the production logging instruments are relatively thin and the well is relatively deep, it is very difficult to salvage. Once the salvage fails, the well has ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21G4/04G01V5/12
Inventor 邓刚遆永周孟闯华成武
Owner 河南省同新科技有限责任公司
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