CN202453508U - Gamma ray detection device - Google Patents
Gamma ray detection device Download PDFInfo
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- CN202453508U CN202453508U CN2012200331439U CN201220033143U CN202453508U CN 202453508 U CN202453508 U CN 202453508U CN 2012200331439 U CN2012200331439 U CN 2012200331439U CN 201220033143 U CN201220033143 U CN 201220033143U CN 202453508 U CN202453508 U CN 202453508U
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- photomultiplier
- gamma
- crystal
- pressure bar
- detection device
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Abstract
The utility model relates to a gamma ray detection device which belongs to the technical field of radioactive logging instruments in the field of oil and gas exploration. The gamma ray detection device is composed of a shielded shell, a scintillation crystal, a photomultiplier and a high-pressure bar, wherein the photomultiplier is arranged in the middle of the shielded shell so as to divide the shielded shell into two detection channels; and the photomultiplier, a photomultiplier seat, the high-pressure bar, a rubber pad, a compression spring and a plug are respectively sequentially arranged in the two detection channels. By using a characteristic that photons generated by the scintillation crystal in the process of implementing the conversion process between natural gamma rays and the photons are omnidirectional, namely, photons are generated in all directions, and simultaneously adopting detection structures on both sides of the crystal, under the condition of same crystal sizes, the counting rate is doubled, thereby reducing the statistical fluctuation, and facilitating the improvement of vertical resolution of gamma logging.
Description
Technical field
The utility model is a kind of gamma-ray detecting device, is suitable for radioactivity well logging instrument technical field in oil-gas exploration.
Background technology
In the exploratory development process of oil gas field; Radioactivity well logging is one of fundamental method; At present the most frequently used measuring method is exactly through adopting scintillation crystal+photomultiplier to survey; Scintillation crystal has been realized the transfer process of gamma-rays to high-effect photon, realizes the conversion of photon to pulse electrical signal by photomultiplier, reaches the purpose that natural gamma is measured.
In certain scintillation crystal range of size, size counting rate more greatly so is just high more, and the statistical fluctuation of gamma counting reduces; But the vertical resolution that causes well logging reduces, otherwise crystalline size is more little; Vertical resolution is high more, but statistical fluctuation increases, and causes that the measurement numerical error is just big more.At present in practical natural gamma logging process; In order to reduce statistical fluctuation; The crystal of selecting for use is longer, and length is generally greater than 100mm, thereby the design of traditional detecting structure causes that the vertical resolution of natural gamma ray log curve is lower; Have only 0.6 meter, can not well on curve, reflect for some thin reservoirs.
Shortcomings such as application number is that 03218726.2 Chinese patent discloses the mode that adopts a plurality of crystal string shapes to arrange and improves counting rate, reduces statistical fluctuation, but exists required crystal more, and sonde configuration is long.
The utility model content
The purpose of the utility model is in order to overcome low, the big defective of reduction statistical fluctuation of counting rate that above-mentioned prior art exists, a kind of gamma-ray detecting device to be provided.
The utility model is made up of shield shell, scintillation crystal, photomultiplier, high pressure bar, and scintillation crystal is installed in the shield shell middle part, and shield shell is divided into two detection channels; Photomultiplier, photomultiplier transit base, high pressure bar, rubber blanket, compression spring, plug are installed respectively in two detection channels successively.
The utility model is to be utilized in scintillation crystal to realize that the natural gamma gamma-rays is in the transfer process of photon; The photon that produces is the characteristics of omnidirectional; Promptly to around all directions all produce photon, the both sides of adopting crystal are detecting structure simultaneously, under the situation of equal crystalline size, counting rate is doubled; Reduce statistical fluctuation, helped to improve the gamma logging vertical resolution.
Description of drawings
Fig. 1 is the longitudinal profile structural map of the utility model;
Fig. 2 is the measurement effect that the utility model is used.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is further specified.
Can know by Fig. 1; The utility model is made up of shield shell 9, scintillation crystal 8, photomultiplier, high pressure bar; Scintillation crystal 8 is installed in shield shell 9 middle parts; Shield shell 9 is divided into two detection channels, photomultiplier 7a, photomultiplier transit base 6a, high pressure bar 5a, rubber blanket 4a, compression spring 3a, plug 2a and attachment plug 1a and photomultiplier 7b, photomultiplier transit base 6b, high pressure bar 5b, rubber blanket 4b, compression spring 3b, plug 2b and attachment plug 1b are installed respectively in two detection channels successively.
The utility model is applied to obtain measurement effect figure as shown in Figure 2, among Fig. 2 in the high resolving power gal sign indicating number instrument; 1 is common gamma-spectrometry curve, and 2 is the gamma-spectrometry curve of using the high resolving power gal sign indicating number instrument of the utility model, and border, the left and right sides is respectively 0; 200API; About standard value 180API, when two radiation are 30CM apart in a steady stream, measure curve and more approach standard value; The filling part of black is represented the difference of the two, explains that the high resolving power gamma instrument bed resolution of having used the utility model is apparently higher than common gamma instrument.
Claims (1)
1. a gamma-ray detecting device is made up of shield shell, scintillation crystal, photomultiplier, high pressure bar, it is characterized in that: scintillation crystal is installed in the shield shell middle part, and shield shell is divided into two detection channels; Photomultiplier, photomultiplier transit base, high pressure bar, rubber blanket, compression spring, plug are installed respectively in two detection channels successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200331439U CN202453508U (en) | 2012-02-02 | 2012-02-02 | Gamma ray detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200331439U CN202453508U (en) | 2012-02-02 | 2012-02-02 | Gamma ray detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202453508U true CN202453508U (en) | 2012-09-26 |
Family
ID=46869363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200331439U Expired - Fee Related CN202453508U (en) | 2012-02-02 | 2012-02-02 | Gamma ray detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202453508U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103498658A (en) * | 2013-08-27 | 2014-01-08 | 中国石油化工集团公司 | Gamma logging data processing method |
| WO2015070578A1 (en) * | 2013-11-14 | 2015-05-21 | 北京华脉世纪石油科技有限公司 | Gamma-ray detector and method for processing gamma rays |
| CN105863606A (en) * | 2015-01-19 | 2016-08-17 | 中国石油集团长城钻探工程有限公司 | Natural gamma-ray logging pup joint |
| CN106461798A (en) * | 2014-05-03 | 2017-02-22 | 托尔特克集团有限责任公司 | Gamma detector protection for downhole operations |
-
2012
- 2012-02-02 CN CN2012200331439U patent/CN202453508U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103498658A (en) * | 2013-08-27 | 2014-01-08 | 中国石油化工集团公司 | Gamma logging data processing method |
| CN103498658B (en) * | 2013-08-27 | 2019-03-19 | 中国石油化工集团公司 | A kind of gamma logging data processing method |
| WO2015070578A1 (en) * | 2013-11-14 | 2015-05-21 | 北京华脉世纪石油科技有限公司 | Gamma-ray detector and method for processing gamma rays |
| CN106461798A (en) * | 2014-05-03 | 2017-02-22 | 托尔特克集团有限责任公司 | Gamma detector protection for downhole operations |
| CN106461798B (en) * | 2014-05-03 | 2020-02-07 | 托尔特克集团有限责任公司 | Gamma detector protection for downhole operations |
| US10649099B2 (en) | 2014-05-03 | 2020-05-12 | Tolteq Group, LLC | Gamma detector protection for downhole operations |
| CN105863606A (en) * | 2015-01-19 | 2016-08-17 | 中国石油集团长城钻探工程有限公司 | Natural gamma-ray logging pup joint |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120926 Termination date: 20210202 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |