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Well logger of natural ganmma energy specntrum

A natural gamma ray spectrum and logging tool technology, which is applied in the field of petroleum logging tools, can solve the problems of not being able to obtain radionuclides specifically, and having no spectrum analysis function, etc., to achieve reduced hardware and connection scale, and high processing performance Effect

Inactive Publication Date: 2006-04-19
中国石化集团胜利石油管理局测井公司
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AI Technical Summary

Problems solved by technology

[0003] Existing similar gamma ray logging tools use sodium iodide scintillation crystals and photomultiplier tubes as probes. The processing circuit is simple, and they can only record the total amount of gamma rays exceeding a certain energy. The content of three types of radionuclides in the formation, potassium, uranium and thorium

Method used

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  • Well logger of natural ganmma energy specntrum
  • Well logger of natural ganmma energy specntrum
  • Well logger of natural ganmma energy specntrum

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Embodiment Construction

[0020] The hardware of the instrument is divided into three parts: (1) probe; (2) electronic signal processing circuit; (3) pressure-bearing shell, such as figure 1 Shown.

[0021] The main components of the instrument probe include a specially designed cesium iodide crystal, a photocoupling plate and a photomultiplier tube. These three components are tightly pressed together by the elastic force of the spring. A voltage divider resistor and a corresponding filter capacitor are welded on the pin of the photomultiplier tube. All components are enclosed in an aluminum metal cylinder. There are three lead wires at the upper end of the probe, namely the high-voltage power supply wire, the signal output wire and the ground wire. The function of the instrument probe is to convert the gamma rays incident into the crystal into negative charge pulses with different amplitudes according to their energy levels, and output them to the preamplifier of the instrument's electronic signal proces...

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Abstract

The present invention relates to a logging unit which can be used for measuring radioactive gamma energy spectrum naturally-existed in the borehole. Its technical scheme includes probe portion, mechanical structure portion and circuit portion, in which the mechanical structure portion mainly includes upper connector, external shell, power supply skeleton, circuit skeleton, scale mark and lower connector. The circuit portion mainly includes power supply plate, main control plate and PHA plate, the power supply plate is mounted on the aluminum alloy skeleton, and the main component of the probe portion includes a cesium iodide crystal, an optically-coupled piece and a photomultiplier, on the pins of photomultiplier are welded a voltage-dividing resistor and a filter capacitor, the described component is packaged in an aluminum metal cylinder, and the upper end of the probe is equipped with three lead-out wires which respectively are high-voltage power supply wire, signal output wire and grounding wire. The circuit composition of main control plate and PHA plate includes energy spectrum preamplifier circuit, energy spectrum communication interface, energy spectrum measurement and control circuit, pulse height analysis circuit and M5 data remote transmission control circuit. Besides, said invention also provides the concrete application field and range.

Description

1. Technical Field: [0001] The invention relates to a petroleum logging tool, which can be used to measure the energy spectrum of naturally occurring radioactive horse rays in a wellbore, thereby quantitatively determining the radionuclides potassium (K), uranium (U), and thorium (Th) in the formation. ) Content. 2. Background technology: [0002] The naturally occurring horse rays in the formation can basically be attributed to the rays emitted when the three types of radionuclides, potassium, uranium and thorium elements decay, with three different characteristic energies. [0003] Existing similar gamma-ray logging tools use sodium iodide scintillation crystals and photomultiplier tubes as probes. The processing circuit is simple and can only record the total amount of gamma rays exceeding a certain energy. There is no spectrum analysis function and no specific requirements. Take the content of three types of radionuclides of potassium, uranium, and thorium in the formation. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
Inventor 刘广盛王卫华滕俊兵刘昌东张磊左宏英南爱香刘洋
Owner 中国石化集团胜利石油管理局测井公司
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