CN105548345A - Oil field fracturing elbow defect detection device and test method - Google Patents
Oil field fracturing elbow defect detection device and test method Download PDFInfo
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- CN105548345A CN105548345A CN201510886278.8A CN201510886278A CN105548345A CN 105548345 A CN105548345 A CN 105548345A CN 201510886278 A CN201510886278 A CN 201510886278A CN 105548345 A CN105548345 A CN 105548345A
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- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
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Abstract
The invention discloses an oil field fracturing elbow defect detection device and a test method. The detection device comprises a motor, a gear transmission pair, a detection platform, a fixed platform, a mobile slide block, a Hall element and a magnetizing coil. Specifically, the gear transmission pair includes a driving transmission part and a driven transmission part, the driving transmission part is mounted on an output shaft of the motor, the motor is fixed on the detection platform, the detection platform, the fixed platform and the driven transmission part center are hinged together, and one driven transmission part side close to the fixed platform is fixed on the fixed platform. The magnetizing coil is sleeved on the periphery of the Hall element, and the two are mounted inside Hall element fixing rings. One end of the mobile slide block is sleeved on the detection platform, and can slide freely along the detection platform, and the other end of the mobile slide block is hinged to the outside of the Hall element fixing rings. During test, the Hall element is sleeved on a to-be-detected elbow.
Description
Technical field:
The present invention relates to elbow fault detection method and pick-up unit field, be specifically related to a kind of oil field compression fracture elbow defect detecting device and the method for inspection.
Background technology:
In oil field compression fracture work progress, fracturing liquid, by fracturing truck and various connecting line, is finally applied in oil well.Wherein, elbow uses in a large number in pipeline, and its effect is alter direction, meets on-the-spot pressing crack construction requirement.Because pressure of the fracturing fluid in elbow is very high, reach as high as about 100MPa, and containing Korrosionsmedium, serious erosion effect (the erosion effect that general outer wall is subject to is more serious) is all had to the inside and outside wall of elbow, at the weakness zone of elbow performance, the defect such as easily to crack, and then fracture failure occurs, cause casualties and property loss.Therefore, in elbow use procedure, periodic inspection is carried out to elbow defect, and the defect found is disposed in time, seem particularly necessary.
Chinese patent document 201220592201.1 discloses a kind of Novel elbow pick-up unit, and this device can carry out the hydraulic testing to elbow, by pressure transducer, detects the force value change in elbow, thus judges whether the bearing capacity of elbow meets the requirements.But this patent does not relate to carries out detecting and assessing to elbow defect.Chinese patent document 201310683517.0 discloses a kind of channel bend Pulsed eddy current testing device, this device passes through pulse eddy current sensor, signal processing circuit and computer system, process elbow defect information, thus detect the defect on elbow surface.But this device uses eddy current pulse signal, different from magnetic flux leakage defect inspection essence, EDDY CURRENT object is effects on surface defect mainly, almost can not detect for elbow inherent vice, and this patent does not relate to tracking to defect and process.
Summary of the invention:
The object of the invention is to for the deficiencies in the prior art, provide a kind of oil field compression fracture elbow defect detecting device and the method for inspection, it can detect inside and the surface imperfection of bend pipe preferably, and detection efficiency is higher, and carries out evaluation of classification and process to defect.
In order to achieve the above object, the present invention adopts following technical scheme to realize:
A kind of oil field compression fracture elbow fault detection device, comprises motor, gear driving pair, detection platform, stationary platform, moving slider, Hall element and magnetizing coil; Wherein, gear driving pair comprises initiatively driving member and slave drive part, initiatively driving member is arranged on the output shaft of motor, motor is fixed in detection platform, between detection platform and stationary platform and slave drive part center is connected together through a hinge, and slave drive part is fixed on the stationary platform near stationary platform side; Magnetizing coil is sleeved on Hall element periphery, and both integral installations are inside Hall element set collar;
One end of moving slider is sleeved in detection platform, and can be free to slide along detection platform, and the other end of moving slider is hinged and connected on outside Hall element set collar; During test, Hall element is sleeved on elbow to be detected.
The present invention further improves and is, slave drive part is imperfect gear, and the breach end of this imperfect gear is fixing on the stationary platform.
The present invention further improves and is, is connected together through a hinge between detection platform and stationary platform by the first connection bearing be fixed in detection platform and the second connection bearing fixed on the stationary platform.
The present invention further improves and is, detection platform offers spill chute, and one end of moving slider is set to the convex slide block matched with spill chute, and the convex slide block of moving slider one end can be free to slide in spill chute in detection platform.
The present invention further improves and is, Hall element set collar comprises Hall element top set collar and Hall element bottom set collar, wherein, the other end of Hall element top set collar one end, set collar one end, Hall element bottom and moving slider is connected together through a hinge; Together with the Hall element top set collar other end is bolted with the Hall element bottom set collar other end.
The present invention further improves and is, also comprising the control sample for contrasting most with elbow to be detected, the inner and outer wall of this control sample offering respectively interior cutting and outer cutting.
The present invention further improves and is, interior cutting and outer groove depth are 5% wall thickness of control sample.
A detection method for oil field compression fracture elbow fault detection device, comprises the following steps:
1) place elbow control sample, starter motor, motor and gear drive spinoff, drive detection platform to rotate, thus drive moving slider to rotate and slide, and then drive Hall element to rotate; Magnetizing coil is energized, and produces Circumferential field, and Hall element can detect magnetic leakage signal; Detection platform turns to the other end from elbow one end, and now, the artificial defect signal in elbow control sample, by connecting computing machine, utilizes Hall effect principle, magnetic leakage signal is converted to voltage signal;
Its signal conversion formula is:
In formula: V
h-potential difference (PD); R
h-Hall coefficient; I-strength of current; B-magnetic induction density; D-plate thickness;
Voltage signal size shows as flaw echo height size on computers, on Display control computer; As can not clear display defect echo, then readjust probe current and voltage, velocity of rotation, until can clear display artificial defect echo, now scan sensitivity have been checked complete;
2) elbow control sample is taken off, elbow to be detected in placement, starter motor, scanning elbow body, after the end of scan, the position of record shortcoming signal; As do not found the signal that lacks, then it is qualified to be judged to, and can continue to use.
The present invention further improves and is, further comprising the steps of:
3) if shortcoming signal exceedes the signal value demarcated in elbow control sample, then this elbow is sentenced useless or is taked other quarantine measures, and suggestion does not continue to use; If shortcoming echo is no more than artificial defect echo height, then carry out step 4) operation;
4) conventional Ultrasound shear wave detection probe and instrument etc. is utilized again to detect shortcoming; Elbow control sample is checked, determines echo height and the detection sensitivity of control sample; After check terminates, shortcoming echo height being no more than to artificial defect echo height detects, as determined, shortcoming is for surface crack, then be judged to be defective, carry out sentencing useless or isolation processing, suggestion does not continue to use, as determine shortcoming for being mingled with, pore, then can continue to use, carry out step 5) operation;
5) echo that lacks exceedes artificial defect echo 50%, the numbering of registration elbow, and the position of shortcoming, length, the degree of depth, make a record to search, and takes the circumstances into consideration to consider to shorten sense cycle, is paid close attention to when next time is detected; Shortcoming echo, between artificial defect echo 20% to 50%, gives record, and in next sense cycle, carries out the emphasis inspection at this position, and checking that shortcoming is no has expansion; Shortcoming echo lower than artificial defect echo 20%, refuses record.
Compared with prior art, elbow defect detecting device of the present invention can solve the defects detection problem of elbow preferably.Utilize Magnetic Flux Leakage Inspecting principle and Hall element, pick-up unit provided by the invention can form an annular Magnetic Flux Leakage Inspecting ring, by the rotation of detection ring, can comparatively fast, comprehensively detect the inside and outside surface imperfection of whole elbow, 100% all standing is realized to whole elbow cross section, is more convenient to the dangerous point grasping whole elbow.
The method of inspection of the present invention proposes a kind of defect handling method, the defective elbow found can be processed in time, to not exceeding standard but having the elbow of shortcoming to carry out classification process, follow the tracks of, understand the spread scenarios of shortcoming, thus avoid the generation of elbow failure conditions, there is good result of use and economic worth.
Accompanying drawing illustrates:
Fig. 1 is Hall effect schematic diagram, and wherein, Fig. 1 (a) is for electron institute is by Lorentz force schematic diagram, and Fig. 1 (b) is Lorentz force schematic diagram suffered by positive charge.
Fig. 2 is the schematic diagram of elbow defect detecting device.
Fig. 3 is the A-A direction view of Fig. 1.
Fig. 4 is the B-B direction view of Fig. 1.
Fig. 5 is that Hall element set collar is connected left view with moving slider.
Fig. 6 is Hall element set collar and the hinged schematic diagram of moving slider.
Fig. 7 is detection platform right view.
Fig. 8 is elbow control sample schematic diagram, wherein, and the C-C direction view that Fig. 8 (b) is Fig. 8 (a).
In figure: 1 is elbow, 2 is motor, and 3 is detection platform, 4 is imperfect gear, and 5 is the first connection bearing, and 6 is stationary platform, 7 is the second connection bearing, and 8 is moving slider, and 9 is Hall element top set collar, 10 is bolt, and 11 is the first articulated elements, and 12 is the second articulated elements, 13 is Hall element bottom set collar, 14 is control sample, and 15 is Hall element, and 16 is magnetizing coil.
Embodiment:
Below in conjunction with accompanying drawing, the present invention is described in further details.First an explanation is done to the structure of elbow defect detecting device.
As shown in Figure 2 and Figure 7, a kind of oil field compression fracture elbow of the present invention fault detection device, comprises motor 2, imperfect gear 4, detection platform 3, stationary platform 6, moving slider 8, Hall element 15 and magnetizing coil 16; Wherein, motor 2 is fixed in detection platform 3, detection platform 3 has chute portions spans on elbow 1, detection platform 3 is connected bearing 5 with first and is fixedly connected with, imperfect gear 4 center is connected bearing 7 and is connected by the first articulated elements 11 with second, imperfect this is taken turns 4 right-hand components and is fixed in stationary platform 6, and stationary platform 6 is connected bearing 7 with second and is fixedly connected with.
As shown in Figure 3 and Figure 4, detection platform 3 has spill chute, and moving slider 8 has convex slide block, and the convex slide block of moving slider 8 can be free to slide in the spill chute of detection platform 3.
As shown in Figure 5 and Figure 6, Hall element top set collar 9 is connected with moving slider 8 by the second articulated elements 12 with Hall element bottom set collar 13, magnetizing coil 16 is fixed on Hall element top set collar 9 and Hall element bottom set collar 13, and Hall element top set collar 9 and Hall element bottom set collar 13 are fixed by bolt 10.
As shown in Figure 8, there are interior cutting 17 and outer cutting 18 (the 5% wall thickness degree of depth in elbow control sample outer arc side, length 20mm, allowable tolerance ± 2.0mm, cutting type is rectangle, and in practice process, elbow outer arc side is the most thin spot of elbow, easily cause wall thickness reduction and crack defect, therefore artificial defect is made in outer arc side).
A kind of oil field compression fracture elbow of the present invention fault detection method, comprises following operation steps:
Step one, places elbow control sample 14, and bolt 10 tightens, starter motor 2, motor 2 and partial gear 4 act on, and drive detection platform 3 to rotate, thus drive moving slider 8 rotate and slide, and then Hall element top set collar 9 and Hall element bottom set collar 13 is driven to rotate.Magnetizing coil 16 is energized, and produce Circumferential field, Hall element 15 just can detect magnetic leakage signal, and (there is certain relation in the defect that can detect here and its direction, defect direction and magnetic direction in 90 °, Effect on Detecting is best, defect direction and magnetic direction are less than 20 °, and Effect on Detecting is poor).Detection platform 3 at the uniform velocity, slowly, stably turns to the other end from elbow one end, now, artificial defect (5% wall thickness degree of depth cutting) signal in elbow control sample 14 is by connecting computing machine and process software, utilize Hall effect principle (as shown in Figure 1), magnetic leakage signal is converted to voltage signal, and its signal conversion formula is:
In formula: V
h-potential difference (PD); R
h-Hall coefficient; I-strength of current; B-magnetic induction density; D-plate thickness;
Voltage signal size shows as flaw echo height size on computers, on Display control computer.As can not clear display defect image, then readjust probe current and voltage, velocity of rotation, until the clear display artificial defect image of energy (general flaw indication height is 80% of whole display height), now scan sensitivity has been checked complete.
Step 2, opens bolt 10, takes off elbow control sample, detected elbow in placement.Starter motor 2, scanning elbow 1 body, after the end of scan, the position of all shortcoming signals on recording processing software, and mark is carried out on elbow.As do not found the signal that lacks, then it is qualified to be judged to, and can continue to use.
Step 3, be equal to or greater than artificial defect echo height (such as 80% display height) if any shortcoming echo height, can be judged to be defect, then this elbow is defective, need carry out sentencing useless or taking other quarantine measures, and suggestion does not continue to use.If shortcoming echo is no more than artificial defect echo height, then carry out step 4 operation.
Step 4, utilizes conventional Ultrasound shear wave detection probe and instrument etc. again to detect shortcoming.Elbow control sample 14 is checked, determines echo height and the detection sensitivity of control sample.After check terminates, shortcoming echo height being no more than to artificial defect echo height detects, and as determined, shortcoming is for surface crack, be then judged to be defective, and carry out sentencing useless or other quarantine measures, suggestion does not continue to use.As being other type shortcoming, then can continuing to use, carry out step 5 operation.Wherein, conventional ultrasound detection system comprises: supersonic reflectoscope, transverse wave double-bevel detector, probe line, couplant etc.
Step 5, shortcoming echo exceedes artificial defect echo 50%, should register the numbering of elbow in time, accurately, the information such as position, length, the degree of depth of shortcoming, make a record to search, and take the circumstances into consideration to consider to shorten sense cycle, paid close attention to when next time is detected.Shortcoming echo, between artificial defect echo 20% to 50%, also be should give record, and in next sense cycle, is carried out the emphasis inspection at this position, and checking that shortcoming is no has expansion.Shortcoming echo lower than artificial defect echo 20%, can refuse record.
Claims (9)
1. an oil field compression fracture elbow fault detection device, it is characterized in that, comprise motor (2), gear driving pair, detection platform (3), stationary platform (6), moving slider (8), Hall element (15) and magnetizing coil (16); Wherein, gear driving pair comprises initiatively driving member and slave drive part, initiatively driving member is arranged on the output shaft of motor (2), motor (2) is fixed in detection platform (3), between detection platform (3) and stationary platform (6) and slave drive part center is connected together through a hinge, and slave drive part is fixed in stationary platform (6) near stationary platform (6) side; Magnetizing coil (16) is sleeved on Hall element (15) periphery, and both integral installations are inside Hall element set collar;
One end of moving slider (8) is sleeved in detection platform (3), and can be free to slide along detection platform (3), and the other end of moving slider (8) is hinged and connected on outside Hall element set collar; During test, Hall element (15) is sleeved on elbow (1) to be detected.
2. a kind of oil field compression fracture elbow fault detection device according to claim 1, it is characterized in that, slave drive part is imperfect gear (4), and the breach end of this imperfect gear (4) is fixed in stationary platform (6).
3. a kind of oil field compression fracture elbow fault detection device according to claim 1, it is characterized in that, be connected together through a hinge by the first connection bearing (5) be fixed in detection platform (3) and the second connection bearing (7) be fixed in stationary platform (6) between detection platform (3) and stationary platform (6).
4. a kind of oil field compression fracture elbow fault detection device according to claim 1, it is characterized in that, (3) offer spill chute to detection platform, one end of moving slider (8) is set to the convex slide block matched with spill chute, and the convex slide block of moving slider (8) one end can be free to slide in the upper spill chute of detection platform (3).
5. a kind of oil field compression fracture elbow fault detection device according to claim 1, it is characterized in that, Hall element set collar comprises Hall element top set collar (9) and Hall element bottom set collar (13), wherein, the other end of Hall element top set collar (9) one end, set collar (13) one end, Hall element bottom and moving slider (8) is connected together through a hinge; Hall element top set collar (9) other end and Hall element bottom set collar (13) other end are linked together by bolt (8).
6. a kind of oil field compression fracture elbow fault detection device according to claim 1, it is characterized in that, also comprising the control sample (14) for contrasting most with elbow (1) to be detected, the inner and outer wall of this control sample (14) offering respectively interior cutting (17) and outer cutting (18).
7. a kind of oil field compression fracture elbow fault detection device according to claim 6, is characterized in that, interior cutting (17) and outer cutting (18) degree of depth are 5% wall thickness of control sample (14).
8. the detection method of a kind of oil field compression fracture elbow fault detection device according to claim 1, is characterized in that, comprise the following steps:
1) elbow control sample (14) is placed, starter motor (2), motor (2) and gear drive spinoff, detection platform (3) is driven to rotate, thus drive moving slider (8) to rotate and slide, and then Hall element is driven to rotate; Magnetizing coil (16) is energized, and produces Circumferential field, and Hall element (15) can detect magnetic leakage signal; Detection platform (3) turns to the other end from elbow one end, and now, the artificial defect signal in elbow control sample (14), by connecting computing machine, utilizes Hall effect principle, magnetic leakage signal is converted to voltage signal;
Its signal conversion formula is:
In formula: V
h-potential difference (PD); R
h-Hall coefficient; I-strength of current; B-magnetic induction density; D-plate thickness;
Voltage signal size shows as flaw echo height size on computers, on Display control computer; As can not clear display defect echo, then readjust probe current and voltage, velocity of rotation, until can clear display artificial defect echo, now scan sensitivity have been checked complete;
2) elbow control sample (14) is taken off, elbow (1) to be detected in placement, starter motor (2), scanning elbow (1) body, after the end of scan, the position of record shortcoming signal; As do not found the signal that lacks, then it is qualified to be judged to, and can continue to use.
9. detection method according to claim 8, is characterized in that, further comprising the steps of:
3) if shortcoming signal exceedes at the upper signal value demarcated of elbow control sample (14), then this elbow (1) is sentenced useless or is taked other quarantine measures, and suggestion does not continue to use; If shortcoming echo is no more than artificial defect echo height, then carry out step 4) operation;
4) conventional Ultrasound shear wave detection probe and instrument etc. is utilized again to detect shortcoming; Elbow control sample (14) is checked, determines echo height and the detection sensitivity of control sample; After check terminates, shortcoming echo height being no more than to artificial defect echo height detects, as determined, shortcoming is for surface crack, then be judged to be defective, carry out sentencing useless or isolation processing, suggestion does not continue to use, as determine shortcoming for being mingled with, pore, then can continue to use, carry out step 5) operation;
5) echo that lacks exceedes artificial defect echo 50%, the numbering of registration elbow, and the position of shortcoming, length, the degree of depth, make a record to search, and takes the circumstances into consideration to consider to shorten sense cycle, is paid close attention to when next time is detected; Shortcoming echo, between artificial defect echo 20% to 50%, gives record, and in next sense cycle, carries out the emphasis inspection at this position, and checking that shortcoming is no has expansion; Shortcoming echo lower than artificial defect echo 20%, refuses record.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107917953A (en) * | 2017-11-03 | 2018-04-17 | 中国石油天然气集团公司 | A kind of pressure break elbow moving part method of inspection |
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| CN105548345B (en) | 2018-10-16 |
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