CN204920943U - Eccentric gamma detection system applied to double-source-distance carbon-oxygen ratio logging instrument - Google Patents
Eccentric gamma detection system applied to double-source-distance carbon-oxygen ratio logging instrument Download PDFInfo
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- CN204920943U CN204920943U CN201520726782.7U CN201520726782U CN204920943U CN 204920943 U CN204920943 U CN 204920943U CN 201520726782 U CN201520726782 U CN 201520726782U CN 204920943 U CN204920943 U CN 204920943U
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- carbon
- logging
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- oxygen ratio
- crystal
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- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 238000001514 detection method Methods 0.000 title claims abstract description 15
- 239000013078 crystal Substances 0.000 claims abstract description 33
- 239000000523 sample Substances 0.000 claims description 17
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- 238000004806 packaging method and process Methods 0.000 abstract 3
- 230000004304 visual acuity Effects 0.000 abstract 1
- 230000005251 gamma ray Effects 0.000 description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001730 gamma-ray spectroscopy Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009102 absorption Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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- Geophysics And Detection Of Objects (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
The utility model relates to a be applied to eccentric gamma detection system of two sources apart from carbon-oxygen ratio logging instrument. The problem of current dual-source apart from carbon-oxygen ratio logging instrument can't satisfy the logging demand to thin oil reservoir resolving power and measurement accuracy under the low-hole hypotonic condition is mainly solved. The method is characterized in that: the detector is characterized in that a crystal packaging shell (2) is sleeved outside the crystal (3), the crystal packaging shell (2) is eccentrically arranged inside the detector shell (1), and a half-moon-shaped lead shielding body (4) is arranged between the crystal packaging shell (2) and the detector shell (1). The eccentric gamma detection system can be directly applied to the existing dual-source carbon-oxygen ratio logging instrument, and can be used for physically shielding gamma rays from a medium in a well in the logging process of the instrument, so that the logging precision and thin oil layer resolution of the dual-source carbon-oxygen ratio logging instrument are effectively improved, and the overall performance index of the residual oil saturation logging technology is improved.
Description
Technical field
The utility model relates to oilfield, is a kind of eccentric gamma detection system being applied to double source distance carbon-oxygen logging tool specifically.
Background technology
Double source utilizes far detector collection from the gamma ray on stratum apart from carbon-oxygen logging tool, utilizes nearly probe collection from the gamma ray of well, carries out borehole compensation by the response of data processing formation.Along with oil field development enters the middle and later periods, only by carrying out data processing to carry out borehole compensation correction to collection power spectrum that is near, far detector, the well logging demand to oil sheet resolution capability and certainty of measurement under low porosity and low permeability condition cannot be met.Therefore, need badly and existing apparatus structure is improved, from the source of gamma ray collection, wellbore effect is controlled, to meet the index request of present stage.
Summary of the invention
Deficiency to the well logging demand of oil sheet resolution capability and certainty of measurement under low porosity and low permeability condition cannot be met apart from carbon-oxygen logging tool to overcome existing double source, the utility model provides a kind of and is applied to the eccentric gamma detection system of double source apart from carbon-oxygen logging tool, this eccentric gamma detection system can directly apply to existing double source apart from carbon-oxygen logging tool, in instrument well logging, physical shielding is carried out to the gamma ray coming from medium in well, the logging accuracy of effective raising double source distance carbon-oxygen logging tool and oil sheet resolution capability, improve the indicators of overall performance of remaining oil saturation logging technique.
The technical solution of the utility model is: a kind of eccentric gamma detection system being applied to double source distance carbon-oxygen logging tool, comprise probe body, crystal, described crystal outer cover has crystal package, described crystal package bias is placed in probe body inside, is equipped with semilune lead screen body between crystal package and probe body.
Described crystal package side and probe body contact internal walls, be equipped with semilune lead screen body between the opposite side of crystal package and probe body.
The utility model has following beneficial effect: owing to taking such scheme, and crystal package bias is placed in probe body inside, and is provided with semilune lead screen body therebetween.Like this, under the condition ensureing gamma ray effective counter rate, detection system arranges gamma ray shield towards side in well, telescoping ram is utilized to push against on internal surface of sleeve pipe by logging instrument after going into the well, in well logging, the overwhelming majority comes from the gamma ray shielded body shielding of borehole fluid, and near, far detector essential record is from the gamma ray in direction, stratum, the statistic fluctuation of collection gamma ray spectroscopy is reduced greatly, and carbon/oxygen log precision and the resolution capability to thin layer effectively improve.
Accompanying drawing explanation
Fig. 1 is longitudinal plan of the present utility model;
Fig. 2 is drawing in side sectional elevation of the present utility model.
1-probe body in figure, 2-crystal package, 3-crystal, 4-semilune lead screen body.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is described in further detail:
Shown in Fig. 1, Fig. 2, be applied to the eccentric gamma detection system of double source apart from carbon-oxygen logging tool, comprise probe body 1, crystal 3, wherein crystal 3 diameter is 40mm, described crystal 3 outer cover has crystal package 2, and the thickness of crystal package 2 is 5mm.It is inner that described crystal package 2 bias is placed in probe body 1, crystal package 2 contacts with the side inwall of probe body 1, and form arc-shaped cavity between opposite side inwall, this cavity is built-in with semilune lead screen body 4, the maximum gauge of semilune lead screen body 4 is 12mm, and both ends open angle is 110 °.
Because the effective counter rate of gamma ray is directly proportional to the volume of crystal detection, namely crystal detection diameter is larger, and effective counter rate is higher; Shield thickness is larger, better to the shield effectiveness of gamma ray.Therefore, in the eccentric detector system of borehole wall formula carbon-oxygen logging tool, semilune lead screen body 4 effectively shields to from the gamma ray in well.Consider carbon oxygen number window width and other housing of instrument (shell, vacuum flask, crystal package etc.) to factors such as the absorptions of gamma ray, by have an appointment more than 80% the gamma ray carrying out medium in artesian well cannot by crystal 3 record, the crystal detection near, far away in detector system all essential record from the gamma ray in the direction, stratum of unshielded body one side.Adopt the eccentric detector system of borehole wall formula carbon-oxygen logging tool, the principle that nearly probe longitudinal frame is good, double detector statistical accuracy is better than simple detector can be made full use of, when ensureing effective counter rate, abundant suppression wellbore effect, the statistic fluctuation of collection gamma ray spectroscopy is reduced greatly, and carbon/oxygen log precision and the resolution capability to thin layer effectively improve.
Claims (2)
1. one kind is applied to the eccentric gamma detection system of double source apart from carbon-oxygen logging tool, comprise probe body (1), crystal (3), it is characterized in that: described crystal (3) outer cover has crystal package (2), it is inner that described crystal package (2) bias is placed in probe body (1), is equipped with semilune lead screen body (4) between crystal package (2) and probe body (1).
2. the eccentric gamma detection system being applied to double source distance carbon-oxygen logging tool according to claim 1, it is characterized in that: described crystal package (2) side and probe body (1) contact internal walls, between the opposite side of crystal package (2) and probe body (1), be equipped with semilune lead screen body (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520726782.7U CN204920943U (en) | 2015-09-18 | 2015-09-18 | Eccentric gamma detection system applied to double-source-distance carbon-oxygen ratio logging instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520726782.7U CN204920943U (en) | 2015-09-18 | 2015-09-18 | Eccentric gamma detection system applied to double-source-distance carbon-oxygen ratio logging instrument |
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| CN204920943U true CN204920943U (en) | 2015-12-30 |
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| CN201520726782.7U Active CN204920943U (en) | 2015-09-18 | 2015-09-18 | Eccentric gamma detection system applied to double-source-distance carbon-oxygen ratio logging instrument |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110609313A (en) * | 2019-09-30 | 2019-12-24 | 南华大学 | Portable gamma radiation directional detector |
| CN111663939A (en) * | 2019-02-20 | 2020-09-15 | 中石化石油工程技术服务有限公司 | Device and method for measuring orientation density while drilling |
| CN112253099A (en) * | 2020-10-27 | 2021-01-22 | 中国石油天然气集团有限公司 | Orientation centering gamma logging instrument while drilling |
-
2015
- 2015-09-18 CN CN201520726782.7U patent/CN204920943U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111663939A (en) * | 2019-02-20 | 2020-09-15 | 中石化石油工程技术服务有限公司 | Device and method for measuring orientation density while drilling |
| CN111663939B (en) * | 2019-02-20 | 2024-05-07 | 中国石油化工集团有限公司 | Direction density measurement while drilling device and measurement method thereof |
| CN110609313A (en) * | 2019-09-30 | 2019-12-24 | 南华大学 | Portable gamma radiation directional detector |
| CN112253099A (en) * | 2020-10-27 | 2021-01-22 | 中国石油天然气集团有限公司 | Orientation centering gamma logging instrument while drilling |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |