CN2731449Y - Detection sensor for defect of trunk thread - Google Patents
Detection sensor for defect of trunk thread Download PDFInfo
- Publication number
- CN2731449Y CN2731449Y CN 200420076742 CN200420076742U CN2731449Y CN 2731449 Y CN2731449 Y CN 2731449Y CN 200420076742 CN200420076742 CN 200420076742 CN 200420076742 U CN200420076742 U CN 200420076742U CN 2731449 Y CN2731449 Y CN 2731449Y
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- probe
- flange
- probe holder
- screw thread
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Abstract
The utility model relates to a detection sensor for defect of trunk thread. The left end of an interior sheath is provided with a magnetizing coil. The middle part of the interior sheath is sheathed with a probe holder which can slide along the exterior surface of the interior sheath. Probes are installed on the probe holder by adopting a floating type, and the probes are in a homogeneous and symmetrical distribution along a circle direction. The middle part of the interior sheath is provided with probe guide slots. Each probe extends into the corresponding probe guide slot. Under the driving of the probe holder, each probe can slide in the corresponding probe guide slot. A magnetic induction element is arranged in each probe. A magnetic conductive lengthen tube is installed in the right end of the interior sheath. The middle part of the magnetic conductive lengthen tube is provided with a flange guide slot. A flange is arranged in the magnetic conductive lengthen tube. The arm of the flange is connected with the probe holder via an extending arm. The shaft of a linear motor is connected with the axle center of the flange. The detection sensor can accurately check various major defects of the trunk threads easily produced in the production process, with high checking precision and efficiency; thus the problem of the production technique which is always faced in the oil fields is solved.
Description
Technical field
The utility model belongs to digitizing magnetic nondestructive detecting instrument, is particularly useful for detecting the detection of oil field with oil pipe (bar), drill rod thread part defective.
Technical background
Oil pipe (bar) and drilling rod are vitals in oil field oil recovery, the drilling process, and consumption is very big, and screw thread positions of these pipe bars are the same with the body of rod, can be because the dissimilar defective of a variety of causes generation in long-term use.Cause that the main cause that tubing thread produces various defectives has: pretightning force deficiency, fault in material or thermal treatment quality are undesirable, screw processing quality is poor, the error of perpendicularity of shoulder end face and external thread center line is big, the shoulder side contact with coupling face tightly, burn into pumping load overloads, bear alternate load etc. for a long time.The defective in the tubing thread district that is caused by above reason mainly shows as the variation of the disconnected button of screw thread, thread abrasion, basal crack, thread gluing and tubing thread district tapering etc.If the untimely discovery of these defectives will influence the safety of oil producing operation, cause equipment damage or casualties.The main detection method of using on the oil field is still ocular estimate and magnetic detection method at present.The defective of threaded area is mainly observed, judges by rule of thumb to the visual detection method by shaft mouth operation workman's naked eyes; The magnetic detection method is a kind of magnetic detection method the earliest, it is that the testing staff leans on naked eyes to judge the threaded portion defective according to MPI fluorescent magnetic particles formed shape under the stray field effect of workpiece, defect place, before detecting, these two kinds of methods all need the double thread surface to clean, operator's labour intensity is big, working environment is arduouser, and the reliability of testing result is poor, can only detect the sort of apparent in view defective, can not satisfy the requirement of accuracy, timeliness detection.The Chinese utility model patent that is CN2570761Y in the disclosed notification number of .09 day .03 in 2003 discloses a kind of Non-destructive Testing of Oil Well Tubing Thread instrument, and it has just done simple explanation on the structure to detector, and what adopt is revolving structure.
In a word, the oil field is with managing the bar screw thread owing to its structural singularity, and it is more that curve is passed through in the curved surface friendship, the surface irregularity of screw thread own, surveyed area is little, does not therefore up to the present also have a kind of effective, reliable detection method, and this also is one of the problem that overcomes of always failing in oil recovery, the drilling process.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned weak point, and a kind of pipe bar screw thread defects detection sensor is provided, and can detect all kinds of defectives of pipe bar screw thread quickly and accurately by it.
The pipe bar screw thread defects detection sensor that the utility model provides comprises probe, and it is characterized in that: the left end of interior cover is equipped with magnetizing coil, the threaded portion that the magnetization position deviation of magnetizing coil is detected and be positioned at shank portion near screw thread; In the middle part of cover be with the probe holder that can slide along its outside surface, probe adopts floating to be installed on the probe holder, and along the circumferential direction evenly, be symmetrically distributed, the middle part of interior cover has the probe gathering sill identical with the number of popping one's head in, that the position is corresponding, each probe stretches in the corresponding probe gathering sill, under the drive of probe holder, each probe slides in corresponding probe gathering sill, in each probe magnetic induction part is housed all, do the difference combination between the magnetic induction part of two symmetrical distributions in twos, and output detection signal; In the right-hand member of interior cover the magnetic conduction extension pipe is installed, the magnetic conduction extension pipe is positioned at the end of tested screw thread; The middle part of magnetic conduction extension pipe has the flange gathering sill, and flange is positioned at the magnetic conduction extension pipe, and the arm of flange links to each other with probe holder by extension arm, and the axle of linear electric motors links to each other with the axle center of flange.
The utility model is according to the Magnetic Flux Leakage Inspecting principle design, overcome prior art in use because end effect, limitation that Lift-off effect caused, can carry out fast the defective of oil pipe, sucker rod, drilling rod internal and external threads, accurate detection.Secondly, the utility model adopts the mode of the suction self-centering location in end clamping and magnetizing coil magnetic field, makes measured tube bar, detection probe and magnetic conductive pole coaxial, has guaranteed the precision and the accuracy that detect well.In addition, the utility model adopts the mode of rectilinear scanning, can realize the complete detection to pipe bar threaded portion, the needs of more realistic detection.The defect type that the utility model can detect comprises: the disconnected button of 1 screw thread; The wearing and tearing of 2 screw threads; 3 root cracks; The variation of 4 thread segment taperings.In a word, the utility model further expands the range of application of this novel lossless detection method of Magnetic Flux Leakage Inspecting, has solved a production technology difficult problem that is all the time faced on the oil field.
Description of drawings
Fig. 1 is the cross-sectional view of pipe bar screw thread Magnetic Flux Leakage Inspecting sensor;
Fig. 2 is the element distribution schematic diagram of pipe bar screw thread Magnetic Flux Leakage Inspecting sensor
Fig. 3 is that the system of whole pipe bar screw thread detector forms;
Fig. 4 is the detection signal waveform figure of zero defect tubing thread;
Fig. 5 is the detection signal waveform figure of oil pipe screw thread wearing and tearing;
The Non-destructive Testing of Oil Well Tubing Thread signal waveforms of Fig. 6 wide 0.10mm crackle of dark 0.3mm for root has;
Fig. 7 is drilled with the detection waveform of the tubing thread of Φ 2.4mm through hole for thread root.
Embodiment
As shown in Figure 1, the left end of interior cover 15 is equipped with magnetizing coil 3, and probe holder 8 is positioned at cover 15 middle part, and can slides along its outside surface.Eight probe 6 (even number get final product) are adopted floating type being installed on the probe holder 8, and along the circumferential direction evenly, be symmetrically distributed, the middle part of interior cover 15 has the probe gathering sill 18 identical with the number of popping one's head in, that the position is corresponding, each probe stretches in the corresponding probe gathering sill, under the drive of probe holder 8, each probe slides in corresponding probe gathering sill 18.In each probe magnetic induction part 21 is housed all, magnetic induction part 21 can be Hall element, magnetic induction coil etc.Do the difference combination between the magnetic induction part of above-mentioned two symmetrical distributions in twos, thereby export four road detection signals.Position relation between probe holder 8, probe 6, interior cover 15 and the magnetic induction part 21 as shown in Figure 2.
Regulate the radial position of each probe 6, make them press close to tested thread surface as much as possible, to reach best detection effect.
Magnetic conduction extension pipe 10 stretches in the right-hand member of interior cover 15, and fixedlys connected with interior cover 15 by screw.Magnetic conduction extension pipe 10 adopts high permeability material, forms one section magnetized area relatively uniformly at threaded portion.The middle part of magnetic conduction extension pipe 10 has flange gathering sill 20, and flange 17 is positioned at magnetic conduction extension pipe 10 and can slides along flange gathering sill 20.Flange 17 links to each other with probe holder 8 by extension arm 16.Position relation between flange 17, interior cover 15, the magnetic conduction extension rod 10 as shown in Figure 3.The axle of linear electric motors 14 links to each other with the axle center of flange 17, the arm that linear electric motors 14 drive flange 17 slides in flange gathering sill 20, slide in probe gathering sill 18 by each probe of probe holder 8 drives that slides thereupon simultaneously, thus the scanning of 6 pairs of tested threaded portions of realization probe.
In the said structure, what probe holder 8 and interior cover 15 adopted is clearance fit, is slipsurface with the outside surface of interior cover 15, and probe 6 slides in the probe gathering sill, the arm of flange 17 slides in flange gathering sill 20, thereby realized the steady of scanning motion, guaranteed the precision that detects.
For guaranteeing the right alignment between each parts of detecting sensor, interior cover 15 left ends are provided with right baffle-plate 2, and the right-hand member of magnetic conduction extension pipe 10 is provided with right baffle plate 12, two plate washers and links to each other by connecting link 4, and whole detecting sensor is connected as a single entity.Locate by the back cover 13 that is fixed on the right baffle plate 12 by the linear electric motors 14 that stroke is suitable with tested screw thread 9 length, guarantee that the axle center of motor is coaxial with the axle center of whole detecting sensor, thereby more one go on foot the accuracy of detection that has improved sensor.
Detecting sensor both can adopt the equal time sampling in the process of using, spatial sampling such as also can adopt.When spatial samplings such as employing, photoelectric encoder 7 is installed on probe holder 8, it can move with probe holder, is wound with belt 11 on the axle of photoelectric encoder 7, and the two ends of belt 11 are separately fixed on right baffle-plate 2 and the right baffle plate 12.Photoelectric encoder 7 is along with probe holder 8 moving linearly together, the rotation axis of photoelectric encoder rotates under the effect of belt 11, and according to the performance of scrambler, rotation axis whenever rotates a circle, send N pulse signal, gather N data thereby control follow-up computer parallel port.When adopting the equal time sampling, the signal output part that does not need to connect photoelectric encoder 7 also can not installed photoelectric encoder.The data of gathering enter follow-up circuit, handle accordingly, finally export testing result.
In the testing process, detecting sensor is set on the measured tube bar screw thread 9, by the body of rod 1 surface alignment of interior cover 15 with oil pipe, and makes magnetizing coil 3 be positioned at the position of measured tube club shaft near screw thread.After magnetizing coil 3 energisings, in the zone of departing from screw thread surveyed area is magnetized, form axial magnetizing field at threaded portion, circumferentially the magnetic induction part that distributes scans the threaded portion after magnetizing, obtain stray field signal, send into follow-up signal acquisition processing circuit and corresponding Signal Analysis System.Magnetic conduction extension rod 10 is under the effect of exciting field, closely contact with pipe bar thread head, exciting field can not leaked in the end, but move on along the magnetic conduction extension rod, thereby form one section more uniform magnetized area in threaded area, realize uniform magnetization pipe bar threaded portion.
The telescopic mast screw thread detector of Fig. 3 for being made up of aforementioned tube bar screw thread Magnetic Flux Leakage Inspecting sensor, whole detector is made up of Magnetic Flux Leakage Inspecting sensor I, signal processor II, Computer signal analytic system III three parts.Four road detection signal A1 by detecting sensor output, B1, C1, D1, pass through the amplifying circuit A2 in the signal processor respectively, B2, C2, D2 amplify, through filtering circuit A3, B3, C3, D3 filtering, through signal conditioning circuit A4, B4, C4, D4 gains to signal and enters four-way signal acquiring board E after the processing such as adjustment, adjusting at zero point, temperature compensation and level biasing, enters Computer signal analytic system G by computer parallel port communication interface F then, and detection signal is carried out real-time analysis, demonstration, diagnosis and identification, output print diagnostic result.
The four-way signal waveforms of the zero defect tubing thread that Fig. 4 arrives for this instrument detecting, as can be seen from the figure, the detection signal of harmless screw thread is the periodic signal with some cycles, except the magnetic leakage signal that is produced by screw thread, does not have other singular signal basically in the signal.
The detection waveform of the tubing thread of screw thread wearing and tearing appears in Fig. 5 for several the 6th buckles from left to right, from waveform as can be seen, on the 6th screw thread signal of third channel, a singular signal that crest is bigger is arranged, this is the be added to waveform of the signal on the screw thread signal of screw thread wear-out defect signal, according to the feature of parameter can clearly must tell screw thread defective such as peak-to-peak value, the ripple of singular signal be wide.
Fig. 6 for several the 10th thread roots of turning left from the right side have one section 0.1mm that cuts into line wide * detection signal waveform of the crackle simulated defect that 0.3mm is dark.
Fig. 7 is drilled with the detection waveform of the tubing thread of Φ 2.4mm through hole for thread root.
Above defective all is to make according to the standard of magnetic detection and user's request for utilization, has simulated some on-the-spot defect types basically, and detection sensitivity also is far longer than the defect type that can cause the harm of pipe bar in the actual detected process.From these defectives with and the relevant detection signal waveform, this pipe bar screw thread detector can satisfy fully to be produced and requirement of client, convenient being suitable for, accurately and reliably.
Claims (3)
1, a kind of pipe bar screw thread defects detection sensor comprises probe, and it is characterized in that: the left end of interior cover (15) is equipped with magnetizing coil (3), the threaded portion that the magnetization position deviation of magnetizing coil (3) is detected and be positioned at shank portion near screw thread; In the middle part of cover (15) be with the probe holder (8) that can slide along its outside surface, probe (6) adopts floating to be installed on the probe holder (8), and it is along the circumferential direction even, be symmetrically distributed, the middle part of interior cover (15) has identical with the number of popping one's head in, the probe gathering sill (18) of position correspondence, each probe stretches in the corresponding probe gathering sill, under the drive of probe holder (8), each probe slides in corresponding probe gathering sill (18), in each probe magnetic induction part (21) is housed all, do the difference combination between the magnetic induction part of two symmetrical distributions in twos, and output detection signal; In the right-hand member of interior cover (15) magnetic conduction extension pipe (10) is installed, magnetic conduction extension pipe (10) is positioned at the end of tested screw thread; The middle part of magnetic conduction extension pipe (10) has flange gathering sill (20), and flange (17) is positioned at magnetic conduction extension pipe (10), and the arm of flange (17) links to each other with probe holder (8) by extension arm (16), and the axle of linear electric motors (14) links to each other with the axle center of flange (17).
2, sensor according to claim 1 is characterized in that: interior cover (15) left end is provided with right baffle-plate (2), and the right-hand member of magnetic conduction extension pipe (10) is provided with right baffle plate (12), and two plate washers link to each other by connecting link (4); Linear electric motors (14) are by being fixed on back cover (13) location on the right baffle plate (12).
3, sensor according to claim 1 and 2 is characterized in that: photoelectric encoder (7) is installed on probe holder (8), is wound with belt (11) on its axle, the two ends of belt (11) are separately fixed on right baffle-plate (2) and the right baffle plate (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420076742 CN2731449Y (en) | 2004-09-24 | 2004-09-24 | Detection sensor for defect of trunk thread |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420076742 CN2731449Y (en) | 2004-09-24 | 2004-09-24 | Detection sensor for defect of trunk thread |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2731449Y true CN2731449Y (en) | 2005-10-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420076742 Expired - Lifetime CN2731449Y (en) | 2004-09-24 | 2004-09-24 | Detection sensor for defect of trunk thread |
Country Status (1)
| Country | Link |
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| CN (1) | CN2731449Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100353162C (en) * | 2004-09-24 | 2007-12-05 | 华中科技大学 | Pipe rod screw fault detection sensor |
| CN101202148B (en) * | 2007-10-26 | 2012-02-29 | 华中科技大学 | Steel pipe partial oblique magnetization device |
| CN102445490A (en) * | 2011-11-21 | 2012-05-09 | 合肥中大检测技术有限公司 | Method and device for detecting transversely distributed defects of end of ferromagnetic pipeline |
| CN106290555A (en) * | 2015-05-26 | 2017-01-04 | 中国石油天然气股份有限公司 | Drilling tool external thread stress detection device |
-
2004
- 2004-09-24 CN CN 200420076742 patent/CN2731449Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100353162C (en) * | 2004-09-24 | 2007-12-05 | 华中科技大学 | Pipe rod screw fault detection sensor |
| CN101202148B (en) * | 2007-10-26 | 2012-02-29 | 华中科技大学 | Steel pipe partial oblique magnetization device |
| CN102445490A (en) * | 2011-11-21 | 2012-05-09 | 合肥中大检测技术有限公司 | Method and device for detecting transversely distributed defects of end of ferromagnetic pipeline |
| CN106290555A (en) * | 2015-05-26 | 2017-01-04 | 中国石油天然气股份有限公司 | Drilling tool external thread stress detection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20071205 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |