CN201025029Y - Under-well electromagnetic shielding box - Google Patents
Under-well electromagnetic shielding box Download PDFInfo
- Publication number
- CN201025029Y CN201025029Y CNU2007201040389U CN200720104038U CN201025029Y CN 201025029 Y CN201025029 Y CN 201025029Y CN U2007201040389 U CNU2007201040389 U CN U2007201040389U CN 200720104038 U CN200720104038 U CN 200720104038U CN 201025029 Y CN201025029 Y CN 201025029Y
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- CN
- China
- Prior art keywords
- shielding box
- box body
- box cover
- shielding
- end cap
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 2
- 238000005481 NMR spectroscopy Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 238000001125 extrusion Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000007789 sealing Methods 0.000 abstract 2
- 238000005553 drilling Methods 0.000 abstract 1
- 230000005311 nuclear magnetism Effects 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
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- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The utility model discloses a well bottom electromagnetic shielding box, which is dedicated for the nuclear magnetic resonance logging while drilling for shielding electromagnetism and reducing electromagnetic interference to the well logging circuit plate. The utility model consists of a shielding box body, a shielding box cover and two end covers, and is characterized in that: the shielding box is in a slot shape, and the upper part of the shielding box body is covered with the shielding box cover; the section of the shielding box cover is in an arch shape; the two ends of the shielding box cover and shielding box body are provided with end covers; the shielding box cover, the shielding box body and the end covers at the two ends form a sealing chamber and are made of aluminum alloy sheets through extrusion, which changes the sealing chamber into a shielding chamber so as to shield effectively the interference of electromagnetism to the circuit. The effect of the utility model is that: the well bottom electromagnetic shielding box can finish shielding the electromagnetic interference, improves the accuracy of well logging data, and improves the forecast precision of oil field reserve and productivity. Moreover, the utility model has the installation method of double circuit plate, and also has modularization combination, convenient dismounting and installation, and is good for on-site maintenance.
Description
Technical field
The utility model relates to the petroleum well logging technology field, is a kind of downhole electromagnetic shielding box, is exclusively used in well logging NMR (Nuclear Magnetic Resonance) logging instrument shielding electromagnetism, reduces the well logging circuit board and is subjected to electromagnetic interference.
Background technology
NMR (Nuclear Magnetic Resonance) logging instrument is a kind of down-hole instrument of oil well logging.As the Chinese patent notification number: 2823554, title: NMR (Nuclear Magnetic Resonance) logging instrument is exactly a kind of down-hole instrument wherein.NMR measuring well exclosure layer medium degree of porosity and contained fluid saturation effect thereof near the eyes is fine.But the nuclear-magnetism probe in the NMR (Nuclear Magnetic Resonance) logging instrument is very big to the electromagnetic interference of circuit.The operate as normal of nuclear-magnetism probe interference effect circuit, therefore solving the anti-electromagnetic interference problem of electric circuit in well becomes extremely important.
At present, there is not to find to have the report of the shielding box that solves the interference of nuclear-magnetism probe.
The utility model content
The purpose of this utility model provides a kind of downhole electromagnetic shielding box, is applied to the oil well logging field, and the shielding electric circuit in well reduces electromagnetic interference, makes circuit energy operate as normal, improves the logging signal precision, obtains good logging effect.
The technical solution adopted in the utility model is: the downhole electromagnetic shielding box comprises shielding box body, shielding box cover and two end caps.The shielding box body is the groove shape, and shielding box body upper cap has shielding box cover, and the cross section of shielding box cover is an arc.There is end cap at two ends at shielding box cover and shielding box body.The end cap at shielding box cover, shielding box body and two ends is formed confined chamber.The end cap at shielding box cover, shielding box body and two ends adopts aluminium alloy sheet to be crushed to, and makes to form a screened room in the confined chamber, effectively shields the interference of electromagnetism to circuit.
For shielding box cover and shielding box body are fastened firmly, inside bar shaped crozier is arranged at the edge of shielding box cover; There is the bar shaped excrescence outside, edge at the shielding box body, and hook-shaped physical efficiency is buckled on the bar shaped excrescence securely.
For the end cap that makes two ends can be fixed on shielding box cover and the shielding box body, on each end cap, be fixed with to 3 junction plates.Junction plate and shielding box cover and the shielding box body between by old screw.
In order in the downhole electromagnetic shielding box, to make things convenient for mounting circuit boards, the inside wall of shielding box body have strip on board in circuit board slot and following board in circuit board slot.Circuit board can be from downhole electromagnetic shielding box one end insertion groove, then with the fixing end cap of sunk screw.
For the utility model downhole electromagnetic shielding box can overall fixed on the electronics skeleton, easy disassembly has the installing plate rectangular with end cap in the bottom of end cap.Can installing plate be fixed on the electronics skeleton by screw.
The beneficial effects of the utility model are: the utility model downhole electromagnetic shielding box can be finished electromagnetic interference shield, has improved the accuracy of well-log information, improves the precision of prediction of oilfield reserve and production capacity.And have the mounting means of double-layer circuit board, and have modular combination, remove and install conveniently, help field maintenance.The utility model can be in shielding electric circuit in well electromagnetic interference, and reasonable mounting circuit boards, and have the modularization installation function is for convenience detach and freely choose the advantage of the suitable circuit board length of length.
Description of drawings
Fig. 1 is the utility model downhole electromagnetic shielding box vertical section structure schematic diagram.
Fig. 2 is the utility model downhole electromagnetic shielding box cross section structure schematic diagram.
Among the figure, 1. shielding box cover 2. shields box body, 3. goes up board in circuit board slot, 4. descends board in circuit board slot, 5. sunk screw, 6. end cap, 7. junction plate, 8. installing plate.
The specific embodiment
Embodiment 1: consult Fig. 1.The downhole electromagnetic shielding box is wide 60 millimeters, and its length can intercept according to different circuit board length.Shielding box body 2, shielding box cover 1 and two end caps 6 adopt aluminum alloy materials to be crushed to particular manufacturing craft.Shielding box body 2 is the groove shape, and shielding box cover 1 is stamped on shielding box body 2 tops, and the cross section of shielding box cover 1 is an arc.Inside strip crozier is arranged at the edge of shielding box cover 1; There is the bar shaped excrescence outside, edge at shielding box body 2, and crozier is buckled on the bar shaped excrescence securely.Crozier and excrescence are that extruding is come out in the extrusion modling process.Two ends at shielding box cover 1 and shielding box body 2 adopt sunk screw to be fixed with end cap 6, promptly are fixed with 3 junction plates 7 on each end cap 6, and a junction plate 7 on top is fixing with shielding box cover 1; Two junction plates 7 of bottom are fixing with shielding box body 2.Fixing between junction plate 7 and shielding box cover 1 and the shielding box body 2 by sunk screw 5.The end cap 6 at shielding box cover 1, shielding box body 2 and two ends is formed confined chamber.The end cap 6 at shielding box cover 1, shielding box body 2 and two ends adopts to make and forms a screened room in the confined chamber, effectively shields the interference of electromagnetism to circuit.The inside wall of shielding box body 2 have strip on board in circuit board slot 3 and following board in circuit board slot 4.Last board in circuit board slot 3 and following board in circuit board slot 4 also push in shielding box body 2 extrusion modling processes.The width of last board in circuit board slot 3 and following board in circuit board slot 4 is 2 millimeters.The transverse slat 8 rectangular with end cap 6 arranged in the bottom of end cap 6, and its length is identical with end cap 6 width, and the width of installing plate 8 is 10 millimeters.On the transverse slat 8 screw hole is arranged, can whole electromagnetic shielding box be fixed on the electronics skeleton by screw.
Claims (5)
1. downhole electromagnetic shielding box, comprise shielding box body (2), shielding box cover (1) and two end caps (6), it is characterized in that: shielding box body (2) is the groove shape, shielding box cover (1) is stamped on shielding box body (2) top, the cross section of shielding box cover (1) is an arc, there is end cap (6) at two ends at shielding box cover (1) and shielding box body (2), the end cap (6) at shielding box cover (1), shielding box body (2) and two ends is formed confined chamber, and the end cap (6) at shielding box cover (1), shielding box body (2) and two ends adopts aluminum alloy materials to be crushed to particular manufacturing craft.
2. downhole electromagnetic shielding box according to claim 1 is characterized in that: at the edge of shielding box cover (1) inside bar shaped crozier is arranged; There is the bar shaped excrescence outside, edge at shielding box body (2).
3. downhole electromagnetic shielding box according to claim 1 is characterized in that: on each end cap (6), be fixed with at least 3 junction plates (7), and fixing between junction plate (7) and shielding box cover (1) and the shielding box body (2) by sunk screw (5).
4. downhole electromagnetic shielding box according to claim 1 is characterized in that: last board in circuit board slot (3) and following board in circuit board slot (4) that strip is arranged at the inside wall of shielding box body (2).
5. according to claim 1 or 2 or 3 or 4 described downhole electromagnetic shielding boxs, it is characterized in that: have in the bottom of end cap (6) and the rectangular transverse slat (8) of end cap (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201040389U CN201025029Y (en) | 2007-03-30 | 2007-03-30 | Under-well electromagnetic shielding box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201040389U CN201025029Y (en) | 2007-03-30 | 2007-03-30 | Under-well electromagnetic shielding box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201025029Y true CN201025029Y (en) | 2008-02-20 |
Family
ID=39098887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201040389U Expired - Lifetime CN201025029Y (en) | 2007-03-30 | 2007-03-30 | Under-well electromagnetic shielding box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201025029Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102418519A (en) * | 2011-12-31 | 2012-04-18 | 北京环鼎科技有限责任公司 | Scale box of nuclear magnetic resonance logging instrument |
| CN102445675A (en) * | 2010-10-12 | 2012-05-09 | 深圳迈瑞生物医疗电子股份有限公司 | Electromagnetic interference suppression device and magnetic resonance imaging equipment using the device |
| CN102564716A (en) * | 2011-11-25 | 2012-07-11 | 国营红峰机械厂 | Magnetic isolation vibration bracket for magnetosensitive element |
| CN105204077A (en) * | 2010-04-29 | 2015-12-30 | 普拉德研究及开发股份有限公司 | Gain-corrected measurements |
| CN109728623A (en) * | 2018-12-26 | 2019-05-07 | 连云港市新达电子技术有限公司 | A kind of ground power supply stable-pressure device for petroleum nuclear magnetic resonance log |
-
2007
- 2007-03-30 CN CNU2007201040389U patent/CN201025029Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105204077A (en) * | 2010-04-29 | 2015-12-30 | 普拉德研究及开发股份有限公司 | Gain-corrected measurements |
| CN102445675A (en) * | 2010-10-12 | 2012-05-09 | 深圳迈瑞生物医疗电子股份有限公司 | Electromagnetic interference suppression device and magnetic resonance imaging equipment using the device |
| CN102564716A (en) * | 2011-11-25 | 2012-07-11 | 国营红峰机械厂 | Magnetic isolation vibration bracket for magnetosensitive element |
| CN102564716B (en) * | 2011-11-25 | 2015-02-11 | 湖北三江航天红峰控制有限公司 | Magnetic isolation vibration bracket for magnetosensitive element |
| CN102418519A (en) * | 2011-12-31 | 2012-04-18 | 北京环鼎科技有限责任公司 | Scale box of nuclear magnetic resonance logging instrument |
| CN109728623A (en) * | 2018-12-26 | 2019-05-07 | 连云港市新达电子技术有限公司 | A kind of ground power supply stable-pressure device for petroleum nuclear magnetic resonance log |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080220 |
|
| CX01 | Expiry of patent term |