CN103590820A - Transient electromagnetic emission probe - Google Patents
Transient electromagnetic emission probe Download PDFInfo
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- CN103590820A CN103590820A CN201310510568.3A CN201310510568A CN103590820A CN 103590820 A CN103590820 A CN 103590820A CN 201310510568 A CN201310510568 A CN 201310510568A CN 103590820 A CN103590820 A CN 103590820A
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- magnetic core
- transient electromagnetic
- cylinder
- transmitting probe
- electromagnetic transmitting
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Abstract
A transient electromagnetic emission probe comprises a cylindrical framework, a coil wound outside the cylindrical framework and a magnetic core mounted inside the cylindrical framework. The scheme can be further improved in that the coil is formed by winding of thick enameled wires, and the magnetic core is coated with polytetrafluoroethylene and closely connected with the inner wall of the cylindrical framework. The transient electromagnetic emission probe has the advantages that transient electromagnetic well-logging excitation is realized through response of different magnetic materials in the magnetic core to a magnetic field so as to obtain a transient electromagnetic field rich in frequency components and high in amplitude; a critical component is provided for measuring cased well formation resistivity with a transient electromagnetic method.
Description
Technical field
The present invention relates to a kind of transmitting probe of transient electromagnetic logger, the instrumentation technical field that in genus petroleum works well logging construction, open hole well and cased hole formation resistivity are measured, particularly a transmitting probe can inspire transient electromagnetic field in open hole well or cased well.
Background technology
In oilfield development process, cross the resistivity on sleeve pipe measurement stratum and can evaluate its oil saturation, analyze remaining oil distribution.Existing TCR adopts DC measurement method.Give the electrode power supply stream that pushes against the borehole wall, measure and flow to the caused voltage change of electric current in stratum.Due to the shunting action of sleeve pipe and cement sheath and sleeve pipe and bed boundary, the electric current flowing in stratum is very little, and like this, in measured signal, the signal relevant with formation resistivity is very little.And electric current is that the method contacting with internal surface of sleeve pipe by electrode is powered, Contact Effect is larger, cannot apply large electric current to electrode.Like this, the signal to noise ratio of measuring-signal is lower, can not continuous measurement.Transient electromagnetic well logging is placed on transmitting probe in well, forms exciting loop with radiating circuit, needn't contact with internal surface of sleeve pipe, can realize and exciting.By measuring the secondary field of transient electromagnetic field in electromagnetic induction, realized the measurement of sleeve pipe formation resistivity.Because the frequency ratio that sleeve pipe measurement adopts is excessively lower, in electromagnetic induction, the amplitude of secondary field is smaller, therefore, must take transient electromagnetic to excite.
Summary of the invention
The present invention is directed to the needs that above-mentioned cased well transient electromagnetic well logging excites, provide a kind of transient electromagnetic to excite probe.
Technical scheme of the present invention is: comprise cylindrical tube skeleton and the outside coil being wound around thereof, the inner magnetic core of installing.
Below provide several concrete schemes of core structure:
One, described magnetic core is assembled mutually by outside cylinder magnetic core and inner cylinder magnetic core, and cylinder magnetic core is the different magnetic core of magnetic material with cylinder magnetic core.
Its two, described magnetic core is cylinder magnetic core, the cylindricality magnetic core that described cylinder magnetic core is semicircle by two kinds of magnetic material differences and cross section is assembled mutually.
Its three, described magnetic core is cylinder magnetic core, described cylinder magnetic core by four kinds of magnetic material differences and cross section be 1/4 circle cylindricality magnetic core be mutually assembled.
Above scheme also can further be improved to: described coil adopts thick enamel-covered wire to be entwined; Described magnetic core is wrapped with tetrafluoro cloth, and is closely connected with cylindrical tube inboard wall of skeleton.
Operating principle of the present invention is: the electric current that coil midstream is crossed produces magnetic field intensity in portion space in coil, is positioned at core material wherein because its high magnetic conductivity is converted to strong electromagnetic intensity by these magnetic field intensities.If magnetic core is comprised of two kinds of magnetic conductivity differences, the applicable different core material of frequency, now the frequency response difference of two kinds of core materials is larger, an applicable high frequency, and an applicable low frequency, the frequency content finally exciting is abundanter.
The invention has the beneficial effects as follows: by the response of different magnetic materials to magnetic field in magnetic core, realize transient electromagnetic well logging and excite, obtain the transient electromagnetic field that frequency content is relatively abundanter, Amplitude Ratio is larger.For measuring cased hole formation resistivity by transient electromagnetic method, provide critical component.
Accompanying drawing explanation
Fig. 1 is general structure schematic diagram of the present invention;
Fig. 2 is a kind of schematic cross-section of magnetic core;
Fig. 3 is the schematic cross-section of another kind of magnetic core;
In figure: 1, coil, 2, cylindrical tube skeleton, 3, magnetic core, 4, semi-circular core post, 5, tetrafluoro cloth, 6, cylinder magnetic core, 7, cylinder magnetic core.
The specific embodiment
Referring to Fig. 1-2, a kind of transient electromagnetic transmitting probe, is comprised of coil 1, cylindrical tube skeleton 2 and magnetic core 3.Coil 1 is wrapped in the outside of cylindrical tube skeleton 2, and the magnetic core 3 of column is placed in the inside of cylindrical tube skeleton 2.Magnetic core 3 coated outside tetrafluoro cloth 5, are closely connected with cylindrical tube skeleton 2 inwalls.Wherein 3 two semi-circular core post 4 of magnetic core are assembled, and these two adopts respectively different magnetic materials, and closely link together and form magnetic core cylinder, are closely connected with cylindrical tube skeleton 2.
Referring to Fig. 1 and Fig. 3, a kind of transient electromagnetic transmitting probe, on the basis of embodiment 1 structure, only change the structure of magnetic core 3 into following design: magnetic core 3 forms magnetic core cylinder by outside cylinder magnetic core 7 and inner cylinder magnetic core 6 mutual sheathing, and outside cylinder magnetic core 7 and inner cylinder magnetic core 6 adopt respectively different magnetic materials.
Claims (5)
1. a transient electromagnetic transmitting probe, is characterized in that: comprise cylindrical tube skeleton and the outside coil being wound around thereof, the inner magnetic core of installing.
2. transient electromagnetic transmitting probe according to claim 1, is characterized in that: described magnetic core is assembled mutually by outside cylinder magnetic core and inner cylinder magnetic core, and cylinder magnetic core is the different magnetic core of magnetic material with cylinder magnetic core.
3. transient electromagnetic transmitting probe according to claim 1, is characterized in that: described magnetic core is cylinder magnetic core, and the cylindricality magnetic core that described cylinder magnetic core is semicircle by two kinds of magnetic material differences and cross section is assembled mutually.
4. transient electromagnetic transmitting probe according to claim 1, is characterized in that: described magnetic core is cylinder magnetic core, and the cylindricality magnetic core that described cylinder magnetic core is 1/4 circle by four kinds of magnetic material differences and cross section is assembled mutually.
5. according to the arbitrary described transient electromagnetic transmitting probe of claim 1-4, it is characterized in that: described coil adopts thick enamel-covered wire to be entwined; Described magnetic core is wrapped with tetrafluoro cloth, and is closely connected with cylindrical tube inboard wall of skeleton.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310510568.3A CN103590820A (en) | 2013-10-26 | 2013-10-26 | Transient electromagnetic emission probe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310510568.3A CN103590820A (en) | 2013-10-26 | 2013-10-26 | Transient electromagnetic emission probe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103590820A true CN103590820A (en) | 2014-02-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310510568.3A Pending CN103590820A (en) | 2013-10-26 | 2013-10-26 | Transient electromagnetic emission probe |
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| CN (1) | CN103590820A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108594313A (en) * | 2018-06-05 | 2018-09-28 | 中煤科工集团西安研究院有限公司 | Hand propelled time domain electromagnetic well logging apparatus and method in a kind of coal mine down-hole drilling |
Citations (7)
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|---|---|---|---|---|
| JPS6151808A (en) * | 1984-08-20 | 1986-03-14 | Fujitsu Ltd | Structure of ringed compound magnetic core |
| US5955884A (en) * | 1994-08-15 | 1999-09-21 | Western Atlas International, Inc. | Method and apparatus for measuring transient electromagnetic and electrical energy components propagated in an earth formation |
| US20050189945A1 (en) * | 2004-02-09 | 2005-09-01 | Arcady Reiderman | Method and apparatus of using magnetic material with residual magnetization in transient electromagnetic measurement |
| CN101581214A (en) * | 2009-03-23 | 2009-11-18 | 西安石油大学 | Transient electromagnetic logging device in through-casing well |
| CN103352694A (en) * | 2013-06-25 | 2013-10-16 | 天津大学 | Logging instrument with acoustoelectric combination |
| CN103352690A (en) * | 2013-06-25 | 2013-10-16 | 天津大学 | Transient electromagnetic logging transmitting probe |
| CN203640726U (en) * | 2013-10-26 | 2014-06-11 | 中国石油化工集团公司 | Transient electromagnetic emission probe |
-
2013
- 2013-10-26 CN CN201310510568.3A patent/CN103590820A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6151808A (en) * | 1984-08-20 | 1986-03-14 | Fujitsu Ltd | Structure of ringed compound magnetic core |
| US5955884A (en) * | 1994-08-15 | 1999-09-21 | Western Atlas International, Inc. | Method and apparatus for measuring transient electromagnetic and electrical energy components propagated in an earth formation |
| US20050189945A1 (en) * | 2004-02-09 | 2005-09-01 | Arcady Reiderman | Method and apparatus of using magnetic material with residual magnetization in transient electromagnetic measurement |
| CN101581214A (en) * | 2009-03-23 | 2009-11-18 | 西安石油大学 | Transient electromagnetic logging device in through-casing well |
| CN103352694A (en) * | 2013-06-25 | 2013-10-16 | 天津大学 | Logging instrument with acoustoelectric combination |
| CN103352690A (en) * | 2013-06-25 | 2013-10-16 | 天津大学 | Transient electromagnetic logging transmitting probe |
| CN203640726U (en) * | 2013-10-26 | 2014-06-11 | 中国石油化工集团公司 | Transient electromagnetic emission probe |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108594313A (en) * | 2018-06-05 | 2018-09-28 | 中煤科工集团西安研究院有限公司 | Hand propelled time domain electromagnetic well logging apparatus and method in a kind of coal mine down-hole drilling |
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Application publication date: 20140219 |