CN102881401A - Casing degaussing instrument and method - Google Patents
Casing degaussing instrument and method Download PDFInfo
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- CN102881401A CN102881401A CN2012103483739A CN201210348373A CN102881401A CN 102881401 A CN102881401 A CN 102881401A CN 2012103483739 A CN2012103483739 A CN 2012103483739A CN 201210348373 A CN201210348373 A CN 201210348373A CN 102881401 A CN102881401 A CN 102881401A
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Abstract
The invention discloses a casing degaussing instrument and method, aiming to overcome the defects that the existing degaussing of the permanent magnet to the casing affects the measurement quality and accuracy. The casing degaussing instrument comprises a detecting module, a degaussing module and a circuit control module; the detecting module is used for detecting the magnetic induction intensity and direction of the casing when moving in the casing; the circuit control module is used for calculating the pulse width which corresponds to the residual magnetism removed by the degaussing module according to the magnetic induction intensity and direction detected by the detecting module; and the degaussing module is used for generating a magnetic field according to the pulse width and comprises an axial coil and a radial core with axes being perpendicular to each other. Due to the adoption of the casing degaussing instrument and method, the influence of the residual magnetism to the inducing instrument and other well logging instruments can be reduced radically, and the work efficiency and the work quality can be improved.
Description
Technical field
The present invention relates to a kind of Deperming Facility, relate in particular to a kind of sleeve pipe demagnetization instrument with and demagnetization method.
Background technology
In the nuclear-magnetism instrument during well logging, because the superpower magnetostatic field of permanent magnet so that instrument is being close to sleeve pipe back magnetization sleeve pipe, forms interference to the logger work of induction and measuring unit damage in a period of time, have a strong impact on logging quality and accuracy.
Summary of the invention
Technical problem to be solved by this invention is to overcome present permanent magnet affects measurement quality and accuracy on the magnetization of sleeve pipe defective.
In order to solve the problems of the technologies described above, the invention provides a kind of sleeve pipe demagnetization instrument, comprise detection module, demagnetization module and circuit control module, wherein:
Detection module is for the magnetic flux density and the direction that detect sleeve pipe when sleeve pipe moves;
Circuit control module is used for detecting the magnetic flux density and the telegoniometer that obtain according to detection module and calculates the corresponding pulse duration of remanent magnetism on the demagnetization module elimination sleeve pipe;
The demagnetization module is used for producing magnetic field according to described pulse duration, comprises the orthogonal axial coil in axle center and radial coil.
Preferably, cover has centralizer on the circuit control module.
Preferably, this sleeve pipe demagnetization instrument comprises:
Energy-storage module links to each other with circuit control module, is used for preventing the impact of moment strong current pulse.
Preferably, this sleeve pipe demagnetization instrument comprises a plurality of detection modules and a plurality of demagnetization module, and detection module and demagnetization modular spacing arrange.
Preferably, the distance between each detection module equates with distance between each demagnetization module.
Preferably, the mandrel of described axial coil and radial coil comprises ferrite.
Preferably, the current opposite in direction on the axial coil in adjacent two demagnetization modules;
The current opposite in direction on the coil radially in adjacent two demagnetization modules.
The demagnetization method of the above-mentioned sleeve pipe demagnetization instrument that the application provides comprises:
When moving, detection module detects magnetic flux density and the direction of sleeve pipe in sleeve pipe;
Circuit control module detects the magnetic flux density and the telegoniometer that obtain according to detection module and calculates the pulse duration that the demagnetization module should be launched;
The demagnetization module produces magnetic field according to described pulse duration.
Preferably, this sleeve pipe demagnetization instrument comprises a plurality of demagnetization modules, and the distance between two detection modules is the resonance frequency of L rice and demagnetization module coil when being the f hertz, and the translational speed of demagnetization module in sleeve pipe is no more than the Lf/3 meter per second.
Compared with prior art, the application's embodiment is by the DC pulse effect, can be directly the remanent magnetism of sleeve pipe be demagnetized, and makes it the loggers such as induction are not consisted of interference.The application's embodiment can fundamentally reduce remanent magnetism to the impact of the loggers such as induction, increases work efficiency and work quality.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in specification, claims and accompanying drawing.
Description of drawings
Accompanying drawing is used to provide the further understanding to technical solution of the present invention, and consists of the part of specification, is used from the application's embodiment one and explains technical scheme of the present invention, does not consist of the restriction to technical solution of the present invention.
Fig. 1 is the organigram of the sleeve pipe demagnetization instrument of the embodiment of the present application.
Fig. 2 is a kind of application scenarios schematic diagram of the embodiment of the present application.
Fig. 3 is the schematic flow sheet of demagnetization method of the sleeve pipe demagnetization instrument of the embodiment of the present application.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, hereinafter be elaborated in connection with the embodiment of accompanying drawing to the application.Need to prove that in the situation of not conflicting, the embodiment among the application and the feature among the embodiment be combination in any mutually.
As shown in Figure 1, the sleeve pipe demagnetization instrument of the embodiment of the present application mainly comprises detection module 81, demagnetization module 82 and circuit control module 83.
Among the application's the embodiment, at circuit control module 83 covers lantern centralizer 84 is arranged, be used for holding circuit control module 83 in the attitude of sleeve pipe.In other embodiment of the application, also can put the centralizer of other types on the circuit control module 83.
The application's embodiment can also comprise energy-storage module 85, links to each other with circuit control module.The application's embodiment can adopt logging cable to power, and energy-storage module 85 is used for preventing that the moment strong current pulse is to the impact of power supply.Embodiments of the invention, what energy-storage module 85 was selected is storage capacitor.
The application's embodiment can comprise two groups even more detection module and demagnetization module.When the application's embodiment comprised a plurality of detection modules and a plurality of demagnetization module, detection module and demagnetization modular spacing arranged.Among the embodiment such as the application, comprise four detection modules and four demagnetization modules, be respectively the first, second, third and the 4th detection module and the first, second, third and the 4th demagnetization module; Detection module and demagnetization modular spacing arrange, also i.e. the first demagnetization is arranged on after the first detection module, and the second detection module is arranged on after the first demagnetization module, and the second demagnetization module is arranged on after the second detection module, ..., the 4th demagnetization module is arranged on after the 4th detection module.Like this, after the demagnetization of the detection of passing through first detection module and the first demagnetization module is processed, the second detection module detects magnetic flux density and the direction through the sleeve pipe after the first demagnetization module, then feed back to circuit control module, the second demagnetization module continues sleeve pipe is carried out the demagnetization processing according to magnetic flux density and the direction that the second detection module detects.The 3rd detection module is proceeded to detect, and the 3rd demagnetization module is proceeded demagnetization and processed; The 4th detection module is proceeded to detect, and the 4th demagnetization module is proceeded demagnetization and processed.Pass through once from sleeve pipe by these four detection modules and four demagnetization modules, detection and the demagnetization carried out are repeatedly processed, and can process so that sleeve pipe is carried out good demagnetization.
As shown in Figure 1, among the application's the embodiment, each demagnetization module 82 includes one group of orthogonal axial coil 91 in axle center and one group of radial coil 92.Among the application's the embodiment, axially the mandrel of coil 91 and radial coil 92 can be ferrite 93 (can certainly be the insulating material such as fiberglass).Compare the insulating material such as fiberglass commonly used as mandrel, can improve the emission effciency of coil with ferrite 93 as mandrel, reduce the transmitting power loss.
Among the application's the embodiment, the current opposite in direction on adjacent two demagnetization module coils, magnetic power corresponding to pulse duration that each demagnetization module produces covers around the whole sleeve pipe, makes it even demagnetization, prevents the dead angle.Among the application's the embodiment, electric current on the coil commutates with certain frequency, the size of electric current is also along with successively decreasing simultaneously, the thereupon corresponding reduction of magnetic flux density of magnetic field intensity and its generation, stroke and the track of magnetic hysteresis loop reduce further, the induction of residual magnetic field also descends thereupon, and when magnetizing current reduced to zero, sleeve pipe remanent magnetism was approximately zero.
Among the application's the embodiment, if a plurality of detection modules and a plurality of demagnetization module are set, the distance between each detection module then, can with each demagnetization module between distance equate, detection module and demagnetization module are arranged in neat array format like this, can carry out good demagnetization to sleeve pipe and process.
As shown in Figure 3, the demagnetization method of the embodiment of the present application mainly comprises the steps:
When moving, step S310, detection module detect magnetic flux density and the direction of sleeve pipe in sleeve pipe;
Step S320, the circuit control module magnetic flux density that detection obtains according to detection module and telegoniometer are calculated the demagnetization module and can be eliminated the corresponding pulse duration of remanent magnetism on the sleeve pipe;
Step S330, the demagnetization module produces magnetic field according to described pulse duration.
The demagnetization method of the embodiment of the present application is when carrying out the demagnetization processing to sleeve pipe, if the distance between two detection modules is L rice, the resonance frequency of demagnetization module coil is f hertz (Hz), the translational speed of then demagnetization module in sleeve pipe is no more than the Lf/3 meter per second, can guarantee that sleeve pipe is had good demagnetization to be processed.
Among the application's the embodiment, after can also in the end a demagnetization module (during a plurality of demagnetization module) arranges another detection module afterwards, be used for checking the remnant magnetism state of processing rear sleeve through demagnetization to detecting through the sleeve pipe after last demagnetization module demagnetization.
Fig. 2 is the circuit working theory diagram of an embodiment of the application, and present embodiment comprises three detection modules and two demagnetization modules.Each detection module comprises a gaussmeter detection probe and a transducer Collect conversion unit; Particularly, three detection modules are respectively the first gaussmeter detection probe 7 and first sensor Collect conversion unit 6, the second gaussmeter detection probe 3 and the second transducer Collect conversion unit 4 and the 3rd detection module 14 and the 3rd transducer Collect conversion unit 11.Two demagnetization modules are respectively the first demagnetization module 8 and the second demagnetization module 10.Two demagnetization modular spacings are arranged between three detection modules.Three transducer Collect conversion unit all are connected to the dsp controller 5 in the circuit control module, dsp controller 5 links to each other with anti-magnetized coil transfer relay 12 through DC pulse power amplifier 13, and wherein DC pulse power amplifier 13 also belongs to aforesaid circuit control module with anti-magnetized coil transfer relay 12.Two demagnetization modules all link to each other with anti-magnetized coil transfer relay 12.DC pulse power amplifier 13 marine site storage capacitors are connected.
Promote instrument according to the direction of arrow shown in Figure 2, initial magnetic flux density and direction that the first gaussmeter detection probe 7 detects on the casing wall 1, by first sensor Collect conversion unit 6 initial magnetic induction and direction are input to dsp controller 5 and carry out computing, calculate the pulse duration of the degaussion coil group that launch, thereby control the size of current in the first demagnetization module 8, the magnetic field intensity of generation in the first demagnetization module 8 and measured casing wall 1 residual magnetization are adapted, and opposite direction, thereby reach the effect of demagnetization.
Demagnetizer is in above-mentioned process, and whether the residual magnetic flux density that the second gaussmeter detection probe 3 detects casing wall 1 satisfies the demagnetization requirement, if reach the requirement of residual magnetization, the second demagnetization module 10 stops to launch the degaussing pulse; If do not reach requirement then can continue and carry out degaussing at the second demagnetization module 10 transmitted pulse direct currents, circuit control module switches emission output by relay 12 and accesses to the second demagnetization module 10, calculate the residual magnetization that the second gaussmeter detection probe 3 detects by circuit control module, produce the demagnetizing field of maximum magnetic induction equipolarization opposite direction by the second demagnetization module 10, act on casing wall 1, thereby further sleeve pipe is carried out demagnetization.This meter detection probe 14 of third high can be checked erasure effect in the process of carrying, if do not reach yet requirement then can proceed demagnetization; Otherwise this section sleeve pipe demagnetization work is finished, the sleeve pipe Date of residual magnetism after registered depth and the demagnetization, and instrument can magnetize the quantity that Program design is declined module according to sleeve pipe, to adapt to the requirement of the concrete demagnetization of different sleeve pipes.
The application's embodiment can adopt the fiberglass bearing shell to hold detection module and demagnetization module, and adopts the rubbery human body pressure equaliser to carry out the balance of external and internal pressure.
Although the disclosed execution mode of the present invention as above, the execution mode that described content just adopts for the ease of understanding the present invention is not to limit the present invention.Those of skill in the art under any the present invention; under the prerequisite that does not break away from the disclosed spirit and scope of the present invention; can do any modification and variation in the details that reaches of implementing in form; but scope of patent protection of the present invention still must be as the criterion with the scope that appending claims was defined.
Claims (9)
1. a sleeve pipe demagnetization instrument comprises detection module, demagnetization module and circuit control module, wherein:
Detection module is for the magnetic flux density and the direction that detect sleeve pipe when sleeve pipe moves;
Circuit control module is used for detecting the magnetic flux density and the telegoniometer that obtain according to detection module and calculates the corresponding pulse duration of remanent magnetism on the demagnetization module elimination sleeve pipe;
The demagnetization module is used for producing magnetic field according to described pulse duration, comprises the orthogonal axial coil in axle center and radial coil.
2. sleeve pipe demagnetization instrument according to claim 1, wherein:
Cover has centralizer on the circuit control module.
3. sleeve pipe demagnetization instrument according to claim 1, wherein, this sleeve pipe demagnetization instrument comprises:
Energy-storage module links to each other with circuit control module, is used for preventing the impact of moment strong current pulse.
4. sleeve pipe demagnetization instrument according to claim 1, wherein:
This sleeve pipe demagnetization instrument comprises a plurality of detection modules and a plurality of demagnetization module, and detection module and demagnetization modular spacing arrange.
5. sleeve pipe demagnetization instrument according to claim 4, wherein:
Distance between each detection module equates with distance between each demagnetization module.
6. sleeve pipe demagnetization instrument according to claim 1, wherein:
The mandrel of described axial coil and radial coil comprises ferrite.
7. sleeve pipe demagnetization instrument according to claim 1, wherein:
Current opposite in direction in adjacent two demagnetization modules on the axial coil;
The current opposite in direction on the coil radially in adjacent two demagnetization modules.
8. the demagnetization method of sleeve pipe demagnetization instrument according to claim 1 comprises:
When moving, detection module detects magnetic flux density and the direction of sleeve pipe in sleeve pipe;
Circuit control module detects the magnetic flux density and the telegoniometer that obtain according to detection module and calculates the pulse duration that the demagnetization module should be launched;
The demagnetization module produces magnetic field according to described pulse duration.
9. the demagnetization method of sleeve pipe demagnetization instrument according to claim 1 comprises:
This sleeve pipe demagnetization instrument comprises a plurality of demagnetization modules, and the distance between two detection modules is the resonance frequency of L rice and demagnetization module coil when being the f hertz, and the translational speed of demagnetization module in sleeve pipe is no more than the LF/3 meter per second.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210348373.9A CN102881401B (en) | 2012-09-18 | 2012-09-18 | Casing degaussing instrument and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210348373.9A CN102881401B (en) | 2012-09-18 | 2012-09-18 | Casing degaussing instrument and method |
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| CN102881401A true CN102881401A (en) | 2013-01-16 |
| CN102881401B CN102881401B (en) | 2014-12-10 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105340029A (en) * | 2013-03-22 | 2016-02-17 | Ppc宽带公司 | Corrective magnetic field for ferrite-based circuits |
| CN107993790A (en) * | 2017-12-28 | 2018-05-04 | 吉林同鑫管业有限公司 | A kind of steel pipe processes continuous demagnetization device |
| WO2019056514A1 (en) * | 2017-09-22 | 2019-03-28 | 上海杰灵磁性器材有限公司 | Permanent magnet structure-based pipeline demagnetization device and application thereof |
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| US5351755A (en) * | 1993-08-02 | 1994-10-04 | Texaco Inc. | Method and apparatus for establish the orientation of tools in a cased borehole |
| CN101567245A (en) * | 2009-03-03 | 2009-10-28 | 西部钻探测井公司 | Down-hole casing tube demagnetizer and using method thereof |
| CN101651006A (en) * | 2009-08-07 | 2010-02-17 | 合肥中大检测技术有限公司 | Demagnetization method of large-scale ferromagnetic pipe fitting and magnetic-sensitive sensor |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US5351755A (en) * | 1993-08-02 | 1994-10-04 | Texaco Inc. | Method and apparatus for establish the orientation of tools in a cased borehole |
| CN101567245A (en) * | 2009-03-03 | 2009-10-28 | 西部钻探测井公司 | Down-hole casing tube demagnetizer and using method thereof |
| CN101651006A (en) * | 2009-08-07 | 2010-02-17 | 合肥中大检测技术有限公司 | Demagnetization method of large-scale ferromagnetic pipe fitting and magnetic-sensitive sensor |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105340029A (en) * | 2013-03-22 | 2016-02-17 | Ppc宽带公司 | Corrective magnetic field for ferrite-based circuits |
| US9582022B2 (en) | 2013-03-22 | 2017-02-28 | Ppc Broadband, Inc. | Device and method for generating a corrective magnetic field for ferrite-based circuits |
| WO2019056514A1 (en) * | 2017-09-22 | 2019-03-28 | 上海杰灵磁性器材有限公司 | Permanent magnet structure-based pipeline demagnetization device and application thereof |
| US11626230B2 (en) | 2017-09-22 | 2023-04-11 | Shanghai Jieling Magnetic Material & Devices Co., Ltd. | Permanent magnet structure-based pipeline demagnetization device and application thereof |
| CN107993790A (en) * | 2017-12-28 | 2018-05-04 | 吉林同鑫管业有限公司 | A kind of steel pipe processes continuous demagnetization device |
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| CN102881401B (en) | 2014-12-10 |
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Address after: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee after: China Oilfield Services Limited Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee before: China Oilfield Services Limited Patentee before: China National Offshore Oil Corporation |