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Improved 2228 lithologic density logging instrument with exemption sources

A lithological density, improved technology, applied in wellbore/well components, earthmoving, construction, etc., can solve problems such as safety restrictions, increase employee safety procedures, affect logging quality, etc., to ensure performance and reliability. Safety index, avoiding unfavorable factors and hidden dangers, reliable effect of technology application

Active Publication Date: 2016-11-16
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the instrument itself has a radioactive 137 cesium source, it is subject to national Class A management restrictions during use, and its safety is limited in foreign labor logging. According to the requirements of safety measures, the instrument must be maintained during maintenance, storage, and logging transportation. Fill in the corresponding safety protection sheet for radioactive sources, the filling process is cumbersome
And because the short source distance has no cesium source, the output amplitude of the short source distance detector will change with the change of temperature due to the influence of temperature, which also affects the logging quality of the instrument
At the same time, when maintaining the long source distance detector of the instrument, the monitoring 137 cesium source should be removed from the front end of the probe crystal for inspection and maintenance before installing it. When inspecting and disassembling the crystal and photomultiplier tube or repairing the detector probe circuit close contact with the 137 cesium source will have a certain impact on human health
[0003] The problem with the radioactive 137 cesium source in the detector of the existing 2228 lithology density logging instrument is that the energy radiated by the 137 cesium source cannot be reduced to the minimum (controllable amount), thereby increasing the labor safety procedures of employees abroad, and the human body is exposed to radioactivity. The source has certain potential safety hazards, which also affects the maintenance speed of the instrument.
[0005] 1. The instrument itself monitors the source of 137 cesium, which affects the safety management of labor logging abroad
[0006] 2. Indoor maintenance equipment, exposure to monitoring 137 cesium source, has a certain impact on human injury
[0007] 3. There is no monitoring 137 cesium source in the short source distance, affected by the temperature in the well, the output amplitude of the detector is unstable, which affects the logging quality

Method used

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  • Improved 2228 lithologic density logging instrument with exemption sources
  • Improved 2228 lithologic density logging instrument with exemption sources
  • Improved 2228 lithologic density logging instrument with exemption sources

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Embodiment Construction

[0017] Below in conjunction with specific embodiment the present invention is described in further detail:

[0018] The improved 2228 lithology density logging tool with the exempt source of the present invention, the corresponding technology and working principle between the exempt source and the long and short source distance detectors are the same as the prior art, you can refer to the prior art, Therefore, it will not be described again. The difference between the present invention and the prior art is to change the energy level of the monitoring cesium source and the installation position of the monitoring cesium source of the 2228 lithology density logging instrument with long and short source distance detectors.

[0019] Such as figure 2 As shown, the improved 2228 lithology density logging tool with exempt source of the present invention includes a long source distance detector and a short source distance detector, and the sheath assemblies 2 of the long and short sou...

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Abstract

The invention discloses an improved 2228 lithologic density logging instrument with exemption sources. The improved 2228 lithologic density logging instrument with the exemption sources comprises a long source distance detector and a short source distance detector. A sheath assembly of the long source distance detector and a sheath assembly of the short source distance detector are each internally provided with a crystal and a photomultiplier. A spring is arranged between each crystal and the top of the corresponding sheath assembly. The exemption sources are arranged on the outer side face, adjacent to the corresponding crystal, of the sheath assembly of the long source distance detector and the outer side face, adjacent to the corresponding crystal, of the sheath assembly of the short source distance detector correspondingly. By additionally arranging the exemption monitoring cesium sources of 0.25 microcuries for the long source distance detector and the short source distance detector, the instrument is free of control from a radioactive source in the using process, the effect that the radiation risk is reduced to the minimum is ensured, and stable operation and reliable technologies of the long source distance detector and the short source distance detector can be achieved.

Description

technical field [0001] The invention relates to the technical field of oil exploration well logging, in particular to an improved 2228 lithology density logging tool with an exempt source. Background technique [0002] The 2228 Lithology Density Logging Tool is one of the radioactive series logging tools and is widely used in petroleum engineering logging. Such as figure 1 As shown, the 2228 lithology density logging tool includes two detectors with a long source distance and a short source distance. The sheath assembly 2 of the long and short source distance detectors is equipped with a crystal 3 and a photomultiplier tube 4 inside. According to the technical characteristics of the instrument, in order to achieve automatic peak stabilization, a 0.8-1.2 microcurie radioactive 137 cesium source (peak stabilization monitoring source 6) is installed on the top of the long source distance detector sheath assembly 2 (one end of the crystal 3), Short source distance detectors ha...

Claims

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Application Information

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IPC IPC(8): E21B47/017E21B49/00
CPCE21B49/00E21B47/017
Inventor 蔡德军余湘郭运嵇成高张崇军刘国臣孔谭于之深王锡磊姜涛
Owner BC P INC CHINA NAT PETROLEUM CORP
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