CN106121628B - 2228 lithologic density logging instrument with exemption source - Google Patents
2228 lithologic density logging instrument with exemption source Download PDFInfo
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- CN106121628B CN106121628B CN201610754737.1A CN201610754737A CN106121628B CN 106121628 B CN106121628 B CN 106121628B CN 201610754737 A CN201610754737 A CN 201610754737A CN 106121628 B CN106121628 B CN 106121628B
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- source
- distance detector
- long
- exemption
- short
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- 239000013078 crystal Substances 0.000 claims abstract description 23
- 229910052792 caesium Inorganic materials 0.000 claims abstract description 21
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 claims abstract description 21
- 230000036039 immunity Effects 0.000 claims description 14
- 238000000034 method Methods 0.000 abstract description 15
- 238000012544 monitoring process Methods 0.000 abstract description 13
- 230000002285 radioactive effect Effects 0.000 abstract description 12
- 230000008569 process Effects 0.000 abstract description 11
- 230000005855 radiation Effects 0.000 abstract description 2
- 238000001228 spectrum Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 7
- 230000000087 stabilizing effect Effects 0.000 description 5
- 230000002411 adverse Effects 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/01—Devices for supporting measuring instruments on drill bits, pipes, rods or wirelines; Protecting measuring instruments in boreholes against heat, shock, pressure or the like
- E21B47/017—Protecting measuring instruments
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Measurement Of Radiation (AREA)
Abstract
The invention discloses an improved 2228 lithologic density logging instrument with an exemption source, which comprises a long-source distance detector and a short-source distance detector, wherein a crystal and a photomultiplier are arranged in a sheath assembly of the long-source distance detector and the short-source distance detector, a spring is arranged between the crystal and the top of the sheath assembly, and the exemption source is respectively arranged on the outer side surfaces of the sheath assembly of the long-source distance detector and the sheath assembly of the short-source distance detector, which are close to the crystal. By adding the 0.25 micro Curie-free monitoring cesium source to the long-distance detector and the short-distance detector, the uncontrollable radioactive source in the using process of the instrument is realized, the radiation risk is ensured to be minimized, and the long-distance detector and the short-distance detector can work stably and technically reliably.
Description
Technical Field
The invention relates to the technical field of petroleum exploration logging, in particular to an improved 2228 lithologic density logging instrument with an exemption source.
Background
2228 lithologic density logging instrument is one of the radioactive series logging instruments and is widely used in petroleum engineering logging. As shown in fig. 1, the 2228 lithologic density logging instrument comprises a long-source distance detector and a short-source distance detector, wherein a crystal 3 and a photomultiplier tube 4 are arranged inside a sheath assembly 2 of the long-source distance detector and the short-source distance detector. According to the technical characteristics of the instrument, in order to achieve the automatic peak stabilizing effect, a radioactive 137 cesium source (peak stabilizing monitoring source 6) with the micro-Curie of 0.8-1.2 is arranged at the top (one end of a crystal 3) of a long-source-distance detector sheath assembly 2, and a short-source-distance detector has no monitoring source. Because the steady peak monitoring source 6 is arranged at the top of the long source distance detector, in order to ensure that the crystal and the photomultiplier can be well matched and receive effective gamma rays, a spring 5 is arranged between the crystal 3 and the top of the sheath assembly, so that a certain distance is reserved between the crystal 3 and the steady peak monitoring source 6, and in order to ensure the receiving intensity, the radiation intensity of the steady peak monitoring source 6 is large. Because the instrument is provided with the radioactive 137 cesium source, the instrument is limited by national A-type management in the use process, the safety of the instrument is limited in external labor logging, and according to the safety measure requirements, the corresponding safety protection list of the radioactive source is required to be filled in the instrument in the maintenance, storage and logging transportation processes, and the filling process is complicated. And because the short source distance does not have cesium sources, the output amplitude of a short source distance detector can change along with the change of temperature under the influence of temperature, and the logging quality of the instrument is also influenced. Meanwhile, when the long source distance detector of the instrument is maintained, the 137 cesium source is detached from the front end of the probe crystal for inspection and maintenance and then is installed, and when the crystal and the photomultiplier are inspected and detached or the probe circuit of the detector is maintained, the 137 cesium source is also in close contact with the monitor, so that the health of a person is affected.
The radioactive 137 cesium source in the existing 2228 lithologic density logger detector has the problem that the energy radiated by the 137 cesium source cannot be reduced to the minimum (controllable quantity), so that the safety procedure of staff on the outside is increased, a certain potential safety hazard factor is caused for human body contact with the radioactive source, and the maintenance rate of the instrument is influenced.
The main aspects are as follows:
1. the instrument itself has a 137 cesium source for monitoring, and safety management of the external labor logging is affected.
2. And the indoor maintenance instrument is contacted with a 137 cesium source for monitoring, and has a certain influence on human body injury.
3. Short-source distance and no-monitoring 137 cesium source are affected by the temperature in the well, and the output amplitude of the detector is unstable, so that the logging quality is affected.
Disclosure of Invention
The invention aims to solve the technical problem of providing an improved 2228 lithologic density logging instrument with an exemption source, and the method is used for avoiding a plurality of adverse factors and potential safety hazards caused by the cesium source of the prior detector in use.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides an improved generation 2228 lithology density logging instrument with exemption source, includes long source distance detector and short source distance detector, and the sheath assembly of long, short source distance detector is inside to all be equipped with crystal and photomultiplier, is provided with the spring between crystal and the sheath assembly top, has set up the exemption source respectively at the sheath assembly of the long source distance detector of next-door neighbour crystal and the sheath assembly lateral surface of short source distance detector.
The exemption source is an exemption cesium source with 0.25 micro curie.
The exemption source is a round thin layer exemption source.
The diameter of the immunity source is 10.0mm, and the thickness is 0.2mm.
The beneficial effects of the invention are as follows: by providing the exemption-free detection radioactive source for the 2228 lithologic density logging instrument using the exemption source, the long-short source distance detector can accurately receive the energy emitted by the exemption source, the long-short source distance double-channel peak stabilizing performance is accurate, the technical application is reliable, the use process is safe and effective, and the improvement of the use performance and the safety index of the instrument using the exemption detection source can be effectively ensured. Avoiding a plurality of adverse factors and potential safety hazards brought by the cesium source of the prior detector in use.
Drawings
Fig. 1 is a schematic diagram of a prior art 2228 lithologic density tool long source distance detector.
FIG. 2 is a schematic diagram of a long source distance detector of the improved 2228 lithologic density logging instrument with immunity source of the present invention.
FIG. 3 is a flow chart of the improved 2228 lithologic density tool with immunity source of the present invention.
Detailed Description
The invention is described in further detail below in connection with the following detailed description:
the improved 2228 lithologic density logging instrument with the exemption source has the advantages that the corresponding technology and the working principle between the exemption source and the long and short source distance detectors are the same as those of the prior art, and reference can be made to the prior art, so that description is not made, and the energy of the cesium source monitored by the long and short source distance detectors and the installation position of the cesium source monitored by the 2228 lithologic density logging instrument are different from the prior art.
As shown in fig. 2, the improved 2228 lithologic density logging instrument with the exemption source comprises a long-source distance detector and a short-source distance detector, wherein a crystal 3 and a photomultiplier 4 are arranged in a sheath assembly 2 of the long-source distance detector and the short-source distance detector, a spring 5 is arranged between the crystal 3 and the top of the sheath assembly 2, and the exemption source 1 is respectively arranged on the outer side surfaces of the sheath assembly 2 of the long-source distance detector and the sheath assembly of the short-source distance detector, which are close to the crystal 3.
The exemption source 1 is an exemption cesium source provided with 0.25 micro curie.
The exemption source 1 is a round thin layer exemption source.
The diameter of the immunity source 1 is 10.0mm, and the thickness is 0.2mm.
Based on the traditional logging technology, the invention can monitor the working stability and reliability of the long-distance detector and the short-distance detector by adopting the cesium-free source with the micro-Curie of 0.25 to the long-distance detector and the short-distance detector respectively. By providing the 2228 lithologic density logging instrument with the exemption radioactive source free of inspection, the placement position is reasonable, the detector can accurately receive the energy emitted by the exemption source, the two-channel (long source distance and short source distance) stability peak performance is accurate, the technical application is reliable, the use process is safe and effective, and the improvement of the safety index of the usage performance of the exemption monitoring source of the instrument can be effectively ensured. Avoiding a plurality of adverse factors and potential safety hazards brought by the prior detector radioactive source when in use.
The whole working process of 2228 lithologic density logging instrument (long source distance detector with exemption source) is taken as an example to be described:
the 2228 lithologic density logging instrument with the exemption source comprises a crystal, a photomultiplier and a sheath assembly, and meanwhile, the long source distance detector with the exemption monitoring source is connected with a long source distance detector circuit, a long source distance signal amplifying and processing circuit, a long source distance pulse amplitude analyzing circuit, a spectrum analyzing circuit, a control circuit, a communication interface (I/O) circuit, a high-voltage circuit and the like, and the working process and technical performance detection of the 2228 lithologic density logging instrument with the exemption source long source distance detector comprise the following steps (shown in figure 3):
(1) firstly, checking whether a long source distance detector assembly (a crystal, a photomultiplier tube and a sheath assembly) is fastened or not;
(2) observing whether an immunity source is clung to the center of the side face of the detector assembly, namely the center of the aluminum round shell, wherein the immunity source can provide certain gamma ray energy for the crystal;
(3) after receiving gamma rays and converting the gamma rays into photons, the crystal outputs negative spike pulse signals after step-by-step voltage upgrading through a photomultiplier tube;
(4) the negative spike output by the long-source-distance detector (crystal and photomultiplier) is subjected to buffer amplification and pulse shaping through an amplifier;
(5) providing the shaped pulse signal to a pulse amplitude analysis board (PHA), classifying the signal amplitude, and transmitting the count of each energy in a certain time to a control board, namely converting the analog signal buffered by the long-source distance detector into a digital quantity proportional to the pulse amplitude;
(6) the digital quantity signal is sent to a spectrum analyzer for storage, then is sent to I/O processing after being subjected to Manchester code encoding, and is sent to the ground;
(7) the control board carries out control data input signals, so that a ground system can know the size of a driving signal, the high voltage applied to the photomultiplier, the high-voltage consumed current and the voltage applied to a high-voltage power supply through the microcontroller, and the long-source-distance high-voltage power supply is adjusted to form pulse signal peak measurement. The ground system shows the random gain at this time, so that the energy of the monitoring-free cesium source (137 Cs) corresponding to the steady peak is 225+/-5 channels.
(8) The energy corresponding to the stationary peak of the cesium-free source is checked to be 225+/-5 channels.
(9) And finishing the peak stabilizing process of the long-source distance detector with the exemption source.
If the cesium source-free steady peak energy of the long source distance detector is not in 225+/-5 channels, the gain size can be automatically adjusted according to the ground command control interface, so that the steady peak energy of the long source distance detector is ensured to be in 225+/-5 channels.
The operation of 2228 lithologic density logger with an exempt monitoring source short source distance detector is consistent with the above description and will not be discussed.
The method has the advantages that when the exemption source 2228 lithologic density logging instrument is adopted, the monitoring source is the exemption source, the purpose that the activity of the radioactive 137 cesium source on the original detector is reduced from 1 micro-Curie to the exemption source activity of 0.25 micro-Curie is achieved, the exemption source 2228 lithologic density logging instrument can be used in any place, the safety of the device does not need to be filled with related safety certificates and the like, the use process is safe and effective, and a plurality of adverse factors and potential safety hazards caused by the use of the radioactive source are avoided. The reasonable placement of the position of the exemption source of the detector ensures that the detector can accurately receive the energy emitted by the exemption source, and the peak stabilizing performance of the long-distance and short-distance detector is accurate and the technology is reliable.
And 6 months in 2016, detecting the overall technical performance of the 2228 lithologic density logging instrument by using an exemption source in a logging instrument repair room. The 2228 lithologic density logging instrument with the exemption source is shown by the combination of the 2228 lithologic density logging instrument with the simulation box with the ground system of 5721, the ground system shows that the values of the working voltage, the high voltage, the gain, the spectrum peak path, the line voltage, the polar plate current and the like of the long-short source distance detector accord with the technical requirements, the observed stability peak corresponding path is all on 225+/-5 CH, and the detection result shows that the 2228 lithologic density logging instrument with the exemption source has good technical performance, and the automatic stability spectrum can be achieved through the gain adjustment.
Table 1 detection data sheet of 2228 lithologic density logging instrument adopting exemption source
Table 2 data detection table for dual-energy spectrum processing of 2228 lithologic density logging instrument using exemption source
| Detecting parameters | LS actual measurement | Technical scope | |
| Long source distance detector energy path | cspk | 226.00 | 225±5CH |
| High voltage of long source distance detector | zgn | 1236.00 | 0.0-2000V |
| Long source distance gain | lsgnecho | 2411.00 | 0—4096 |
| Detecting parameters | SS actual measurement value | Technical scope | |
| Short source distance detector energy path | cspks | 223.00 | 225±5CH |
| Short source distance detector high voltage | zgns | 1232.00 | 0-2000V |
| Short source distance gain | ssgnecho | 2383.00 | 0—4096 |
According to the working process and the automatic spectrum stabilization process steps, the strict operation process shows that the detection data of the 2228 lithologic density logging instrument with the exemption source is accurate and reliable, the long and short source distance detectors have good technical performance, the gain can be automatically adjusted through the ground, and the energy corresponding to the spectrum peak can be all 225+/-5 CH, so that the 2228 lithologic density logging instrument with the exemption source has good working performance and good automatic spectrum stabilization effect.
In view of the foregoing, the present invention is not limited to the above-described embodiments, and other embodiments can be easily provided within the scope of the technical teaching of the present invention, but such embodiments are included in the scope of the present invention.
Claims (4)
1. The 2228 lithology density logging instrument with the exemption source comprises a long-source distance detector and a short-source distance detector, wherein a crystal (3) and a photomultiplier (4) are arranged inside a sheath assembly (2) of the long-source distance detector and the short-source distance detector, and a spring (5) is arranged between the crystal (3) and the top of the sheath assembly (2).
2. The 2228 lithologic density logger with immunity source of claim 1 wherein the immunity source (1) is an immunity cesium source with 0.25 micro curie.
3. The 2228 lithologic density logger with immunity source of claim 1 or 2, wherein the immunity source (1) is a circular lamellar immunity source.
4. A 2228 lithologic density logger with immunity source according to claim 3, wherein the immunity source (1) has a diameter of 10.0mm and a thickness of 0.2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610754737.1A CN106121628B (en) | 2016-08-29 | 2016-08-29 | 2228 lithologic density logging instrument with exemption source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610754737.1A CN106121628B (en) | 2016-08-29 | 2016-08-29 | 2228 lithologic density logging instrument with exemption source |
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| Publication Number | Publication Date |
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| CN106121628A CN106121628A (en) | 2016-11-16 |
| CN106121628B true CN106121628B (en) | 2023-07-21 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111119871B (en) * | 2018-10-31 | 2023-12-26 | 中国石油化工集团有限公司 | Measuring device and measuring method for measuring stratum density value |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3617746A (en) * | 1967-07-10 | 1971-11-02 | Dresser Ind | Dual detector-compensated density well-logging system |
| US4596926A (en) * | 1983-03-11 | 1986-06-24 | Nl Industries, Inc. | Formation density logging using multiple detectors and sources |
| RU1693992C (en) * | 1988-10-10 | 1996-04-27 | Всероссийский научно-исследовательский институт разведочной геофизики "Рудгеофизика" | X-ray radiometric logging sonde |
| CN2737943Y (en) * | 2004-10-26 | 2005-11-02 | 西安市首创科技工程有限公司 | Detector for low-energy gamma source fluid density well logging instrument |
| CN102094643B (en) * | 2010-12-30 | 2013-08-21 | 中国海洋石油总公司 | Di-gamma logging instrument |
| CN202731907U (en) * | 2012-07-18 | 2013-02-13 | 吉艾科技（北京）股份公司 | Storage type litho-density logger |
| CN202970684U (en) * | 2012-11-20 | 2013-06-05 | 中国船舶重工集团公司第七一八研究所 | Nuclear logging shakeproof gamma-ray energy spectrum detector |
| CN104500052A (en) * | 2014-11-27 | 2015-04-08 | 中国石油天然气集团公司 | Compensation density logging-while-drilling instrument |
| CN104536056B (en) * | 2015-02-02 | 2017-08-11 | 核工业北京地质研究院 | Small-bore gamma spectrometry log device and data acquisition transmission and from steady method |
| CN205955723U (en) * | 2016-08-29 | 2017-02-15 | 中国石油集团渤海钻探工程有限公司 | Improved generation 2228 lithology density logger with exemption source |
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Non-Patent Citations (1)
| Title |
|---|
| Baker Atlas公司系列密度测井仪安全施工紧急预案;解琪;陈绪涛;郭广鎏;王增平;;石油仪器;第21卷(第05期);第93-94页 * |
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Effective date of registration: 20200117 Address after: 100120 Beijing Xicheng District six laying Kang Applicant after: CHINA NATIONAL PETROLEUM Corp. Applicant after: CHINA PETROLEUM LOGGING Co.,Ltd. Address before: 300457 No. 106, Huang Hai Road, Tianjin Binhai New Area Development Zone, Bohai Drilling Engineering Co., Ltd. Applicant before: CNPC Bohai Drilling Engineering Co.,Ltd. |
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