CN202947991U - Multi-sector electromagnetic defect detection thickness tester - Google Patents
Multi-sector electromagnetic defect detection thickness tester Download PDFInfo
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- CN202947991U CN202947991U CN201220550266.XU CN201220550266U CN202947991U CN 202947991 U CN202947991 U CN 202947991U CN 201220550266 U CN201220550266 U CN 201220550266U CN 202947991 U CN202947991 U CN 202947991U
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- detection thickness
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Abstract
The utility model relates to a multi-sector electromagnetic defect detection thickness tester which comprises a measurement framework and a detection coil, wherein the detection coil is arranged inside the measurement framework. The multi-sector electromagnetic defect detection thickness tester provided by the utility model is high in resolution ratio, low in measurement interference and high in measurement sensitivity.
Description
Technical field
The utility model belongs to oil well tube wall situation detection field, relates to a kind of thicknessmeter, relates in particular to a kind of many sectors electromagnetic defect detection thickness gauge.
Background technology
Be accompanied by the development of modern science and technology, the equipment that is applied to the oil well logging industry is also constantly updating, and satisfies complex environment and job requirement rapidly and efficiently in modern oil well logging process with this.The most oil field of China has entered the tail period stage at present, and tubing and casing is damaged the well increasing year by year, directly affects serviceable life and the output of oil well.Detect by many sectors electromagnetic defect detection thickness gauge, can be oil well the quality check report is provided, play a significant role in the prevention of corruption of oil well middle sleeve etc. and prediction, it is to utilize the principle of stray field Eddy Current Nondestructive Testing to realize.When detected object is intact, the lines of magnetic induction in material will be constrained in material, and magnetic flux is parallel to material surface, does not almost have lines of magnetic induction to pass from the surface, and tested surface of the work does not have magnetic field.but, when existing the defective of cutting magnetic line in material, the defective of material surface or structural state variation can make magnetic permeability change, because the magnetic permeability of defective is very little, magnetic resistance is very large, make the magnetic flux distorted in magnetic circuit, the lines of magnetic induction flow direction can change, except the part magnetic flux is directly walked around defective by defective or by material internal, also have the magnetic flux of part can leak into the material surface overhead, walk around defective by air and reenter once again material, thereby the place forms stray field at System of Detecting Surface Defects For Material, just can find defective by the variation that detects stray field.
During the tubing and casing with higher relative permeability that is applied in conventional eddy current detection method detects, but there is comparatively serious skin effect, makes eddy current mainly concentrate on the inside surface of pipe, affected the accuracy of measuring.And utilize the far field principle just can well address this problem.Far-field eddy can have identical sensitivity to the inwall of tubing and casing or outer change in wall or variation in thickness, thereby is not subjected to the restriction of skin depth condition.Far-field eddy detects generally and pops one's head in to realize to detect by interior through type.It is made of drive coil and magnetic test coil, and the distance of regulation drive coil and magnetic test coil will reach the length of 2～3 times of detected bores.Drive coil will pass to tens of magnetic fields that produce alternation to the low-frequency ac signal of 200 hertz, and magnetic test coil is to receive the magnetic field eddy current signal that drive coil produces.Utilize weak voltage signals that magnetic test coil receives to carry out effectively judging after amplification filtering the variation of metallic conduit inside and outside wall defective and pipe thickness.
The magnetic test coil that existing electromagnetic defect detection thickness gauge adopts is to be arranged on the outside of measurement skeleton by the mode of leaf spring, and in use friction or collision occur the easy and borehole wall, can not effectively guarantee the normal use of magnetic test coil.
The utility model content
In order to solve the above-mentioned technical matters that exists in background technology, the utility model provides that a kind of resolution is high, measurements interference is little and has measured sensitivity much higher sector electromagnetic defect detection thickness gauge.
Technical solution of the present utility model is: the utility model provides a kind of many sectors electromagnetic defect detection thickness gauge, comprises measuring skeleton and magnetic test coil, and its special character is: it is inner that described magnetic test coil is arranged on the measurement skeleton.
It is inner that above-mentioned magnetic test coil is measured skeleton along being axially disposed within of measurement skeleton.
Above-mentioned magnetic test coil is one or more groups.
When above-mentioned magnetic test coil was many groups, it is inner that described many group magnetic test coils are distributed on the measurement skeleton.
Above-mentioned magnetic test coil is 40 groups.
When above-mentioned magnetic test coil was 40 groups, described 40 groups of magnetic test coils comprised 20 groups of magnetic test coils and lower 20 magnetic test coils, and described upper 20 groups of magnetic test coils and lower 20 groups of magnetic test coils are uniform staggered with at the measurement skeleton inner up and down.
The utility model has the advantage of: the utility model is realized contactless Non-Destructive Testing by electromagnetic principle, need not be close to tube wall during measurement, avoided the deposition of cement on tube fluid, tube wall or paraffin and the accuracy of interferometry data, greatly reduced the interference of measuring, simultaneously, caliber is divided into 40 sectors, a magnetic test coil covers 9 degree of differentiating tube wall, realized 360 degree of tube wall are covered in the one-shot measurement process, Measurement Resolution is provided.Instrument adopts the far-field eddy principle to carry out Non-Destructive Testing, and in far-field range, the position of magnetic test coil is little on the impact of detection sensitivity, has higher detection sensitivity; Temperature is very little on the impact of phase measurement, is applicable to very much high temperature, hyperbaric environment in oil well logging.
Description of drawings
Fig. 1 is the one-piece construction schematic diagram of many sectors provided by the utility model electromagnetic defect detection thickness gauge;
Fig. 2 is the down-hole part-structure schematic diagram of many sectors provided by the utility model electromagnetic defect detection thickness gauge;
Wherein:
The 1-PC host computer, 2-ground Decoder, 3-single core cable, 4-the spread of the rumours instrument, 5-downhole instrument, 6-upper roller centralizer, deviation sensor unit, 7-orientation, 8-power module, 9-signal processing unit, 10-magnetic test coil amplification filtering unit, 11-temperature sensor, the upper 20 groups of magnetic test coils of 12-, 20 groups of magnetic test coils under 13-, 14-drive coil driver element, 15-drive coil, 16-bottom roller centralizer.
Embodiment
referring to Fig. 1 and Fig. 2, , many sectors electromagnetic defect detection thickness gauge, comprise PC host computer 1, ground Decoder 2, the spread of the rumours instrument 4 and downhole instrument 5, PC host computer 1 is connected with the ground Decoder by the connection of serial communication line, ground Decoder 2 is connected with downhole instrument by single core cable 3 connections, downhole instrument 5 comprises upper roller centralizer 6, deviation sensor unit, orientation 7, power module 8, signal processing unit 9, magnetic test coil amplification filtering unit 10, temperature sensor 11, upper 20 groups of magnetic test coils 12, lower 20 groups of magnetic test coils 13, drive coil driver element 14, drive coil 15, bottom roller centralizer 16.
Referring to Fig. 2, the down-hole part of many sectors provided by the utility model electromagnetic defect detection thickness gauge, identical with traditional electromagnetic defect detection thickness gauge, include and measure skeleton and magnetic test coil, difference is magnetic test coil to measure skeleton inner along measuring being axially disposed within of skeleton, is not to be arranged on by leaf spring the outside of measuring skeleton.Magnetic test coil is one or more groups; When magnetic test coil is many groups, organizes magnetic test coil more and be distributed on that to measure skeleton inner.
For example in Fig. 2, the magnetic test coil that the utility model adopts is 40 groups, comprises 20 groups of magnetic test coils and lower 20 magnetic test coils, and upper 20 groups of magnetic test coils and lower 20 groups of magnetic test coils are uniform staggered with at the measurement skeleton inner up and down.
Adopt touchless electromagnetic principle, the covering of 360 degree is carried out in minute 40 sectors to tube wall, and each detecting sensor is carried out the scanning of 9 degree to tube wall, has improved the resolution that detects when having reduced measurements interference.
40 sectors are comprised of a large drive coil 15 and 40 road magnetic test coils, and drive coil and magnetic test coil have the theoretical requirement that meets the far-field eddy principle.
The alternating electromagnetic field that drive coil 15 sends meets the low frequency measurement requirement of far-field eddy, and the electromagnetic induction electromotive force that magnetic test coil receives only has several microvolts, needs to carry out the data processing through entering signal processing unit 9 after multistage amplification and filtering.
9 pairs of signal processing units gather respectively the sensor signal data of coming up and perform mathematical calculations and obtain the linear relationship of phase place, amplitude and thickness.
To No. 40 sensors carry out time-division multiplex switch to gather, automatically control collection signal enlargement factor, by encoding and decoding communication, phase place and the amplitude data that computing obtains are sent to ground Decoder 2.
Concrete use-pattern of the present utility model is:
(1) PC host computer 1 power supply-ground Decoder 2 power supply-the spread of the rumours instrument 4 power supply-downhole instrument 5 power supply-releases-instrument calibrations;
(2) inclination angle, continuous acquisition instrumental azimuth, well temperature data.
(3) drive coil 15 is added the low frequency square wave, inspire transient electromagnetic field, 40 groups of magnetic test coils receive the inductive electromagnetic field signal.
(4) signal processing unit 9 gathers through the magnetic test coil signal data after amplification filtering, DSP calculates phase value and the amplitude that needs through data transformation, phase place and amplitude signal that will be corresponding with pipe thickness send to ground Decoder 2 by single core cable 3, then carry out the tracing analysis of tube wall situation through PC host computer 1.
(5) after to be measured completing, disconnect ground Decoder 2 power supplys, lay down the spread of the rumours instrument 4 and downhole instrument 5, the spread of the rumours instrument 4 and downhole instrument 5 are rinsed well, put into instrument container.
Claims (6)
1. sector electromagnetic defect detection thickness gauge more than a kind, comprise and measure skeleton and magnetic test coil, it is characterized in that: it is inner that described magnetic test coil is arranged on the measurement skeleton.
2. many sectors according to claim 1 electromagnetic defect detection thickness gauge is characterized in that: it is inner that described magnetic test coil is measured skeleton along being axially disposed within of measurement skeleton.
3. many sectors according to claim 1 and 2 electromagnetic defect detection thickness gauge is characterized in that: described magnetic test coil is one or more groups.
4. many sectors according to claim 3 electromagnetic defect detection thickness gauge is characterized in that: when described magnetic test coil was many groups, it is inner that described many group magnetic test coils are distributed on the measurement skeleton.
5. many sectors according to claim 4 electromagnetic defect detection thickness gauge is characterized in that: described magnetic test coil is 40 groups.
6. many sectors according to claim 5 electromagnetic defect detection thickness gauge, it is characterized in that: when described magnetic test coil is 40 groups, described 40 groups of magnetic test coils comprise 20 groups of magnetic test coils and lower 20 magnetic test coils, and described upper 20 groups of magnetic test coils and lower 20 groups of magnetic test coils are uniform staggered with at the measurement skeleton inner up and down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220550266.XU CN202947991U (en) | 2012-10-24 | 2012-10-24 | Multi-sector electromagnetic defect detection thickness tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220550266.XU CN202947991U (en) | 2012-10-24 | 2012-10-24 | Multi-sector electromagnetic defect detection thickness tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202947991U true CN202947991U (en) | 2013-05-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220550266.XU Expired - Lifetime CN202947991U (en) | 2012-10-24 | 2012-10-24 | Multi-sector electromagnetic defect detection thickness tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202947991U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104564023A (en) * | 2014-12-18 | 2015-04-29 | 西安思坦仪器股份有限公司 | Non-contact type high-accuracy array electromagnetic thickness gauge |
-
2012
- 2012-10-24 CN CN201220550266.XU patent/CN202947991U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104564023A (en) * | 2014-12-18 | 2015-04-29 | 西安思坦仪器股份有限公司 | Non-contact type high-accuracy array electromagnetic thickness gauge |
| CN104564023B (en) * | 2014-12-18 | 2017-11-28 | 西安思坦仪器股份有限公司 | Non-contact type high-precision array electromagnetic thickness tool |
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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: 20130522 |
|
| CX01 | Expiry of patent term |