CN111912899A - Online nondestructive flaw detection method and device for oil pipe - Google Patents
Online nondestructive flaw detection method and device for oil pipe Download PDFInfo
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- 238000005516 engineering process Methods 0.000 description 4
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- 239000003129 oil well Substances 0.000 description 4
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- 238000004451 qualitative analysis Methods 0.000 description 2
- 238000004445 quantitative analysis Methods 0.000 description 2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- 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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- G01N27/85—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields using magnetographic methods
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
- G01B7/10—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance
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Abstract
An online nondestructive flaw detection device for an oil pipe comprises a wellhead assembly, wherein the wellhead assembly comprises a shell, a centering follow-up mechanism, a measuring arm assembly kit, a connecting rod assembly kit, a magnetization system and peripheral equipment; the peripheral equipment comprises a junction box, a signal conversion system, a signal acquisition and conditioning module, test software, a computer and an analog and digital signal transmission line; the magnetizing system is arranged at the lower part of the bottom plate; the centering follow-up mechanism comprises a guide wheel and a measuring roller, two measuring rollers are arranged to be in direct contact with the coiled tubing to be detected, an upper half detection unit and a lower half detection unit are arranged above and below the measuring roller of the measuring arm assembly suite, the measuring arm assembly suite respectively comprises two magnetic flux leakage detection probes and an ellipticity detection probe which are hinged around a pair of semicircular shafts of the coiled tubing, and a safety gap is kept between the magnetic flux leakage detection probes and the ellipticity detection probes and the surface of the coiled tubing to be detected.
Description
Technical Field
The invention relates to an oil pipe on-line nondestructive flaw detection method and device.
Background
CN2019101510536 provides an integral type coiled tubing defect detecting device, including first half detecting element, second half detecting element two detecting element, two detecting element mutually support the passageway that produces the oil feed pipe and pass between the two after the equipment, are equipped with magnetism generating device, magnetic leakage test probe, ovality test probe and the guider that sets up on two detecting element in the passageway, and detecting element outer joint has played the measuring arm assembly external member of two detecting element of direction along the motion of oil pipe. The invention can realize real-time and accurate detection of various physical defects, such as corrosion, cracks, mechanical damage, pitting, holes and the like, wall thickness, outer diameter and ovality of the coiled tubing string. Magnetism generating device, magnetic leakage test probe and guider are located detecting element's middle part, and the ellipticity test probe is located detecting element's both sides guard shield, and magnetism generating device, magnetic leakage test probe, ellipticity test probe and guider are at first detecting element, the corresponding setting of second detecting element, all install four cylindrical magnetic rods, two sets of yokes, four leading wheels, a semicircle ring formula magnetic leakage test probe and three ellipticity test probe in first detecting element of device and second detecting element.
Furthermore, leakage magnetic field signals of ovality, wall thickness and defect positions of the coiled tubing to be detected are acquired, analyzed, processed and recorded through a matched peripheral data acquisition device and a computer, so that real-time accurate detection of defects, wall thickness, ovality and length of the tubular column of the coiled tubing to be detected is realized. The device adopts a multifunctional integrated design, is provided with 8 cylindrical magnetic rods for magnetizing the coiled tubing to be detected, comprises two semi-circular magnetic flux leakage detection probes and 6 ovality detection probes, and can realize accurate detection on the defects, the wall thickness, the length, the outer diameter and the ovality of the coiled tubing by a single-platform detection device;
CN2015106837813 provides a defect detection device in little pipe diameter coiled tubing based on triaxial magnetic leakage detection, and defect detection device in little pipe diameter coiled tubing based on triaxial magnetic leakage detection includes: a support shaft; the leakage magnetic detection assembly is arranged on the supporting shaft and comprises a MEMS (micro-electromechanical systems) triaxial magnetic sensor, and the MEMS triaxial magnetic sensor can detect a leakage magnetic signal in a pipeline to be detected. This document cannot be used to detect the oil in oil wells with large diameter (above 50 a).
In China, the oil well pump oil production well accounts for more than 90% of the mechanical oil production well, and the failure of an oil pipe in the oil well pump oil production well is very high, which is mainly caused by the defects of corrosion pits and holes, eccentric wear caused by friction, crack caused by bearing, flaw caused by manufacturing and the like in the service process of the oil pipe. The leakage of the oil pipe in service due to defects and even the breakage of the oil pipe cause inestimable loss, and the commonly applied precautionary measure at present is to pull the oil pipe in service all regularly back to the oil pipe station, and check the defects of the oil pipe by methods of pressurization, manual checking and the like, so that the method is not economical, is not more scientific and wastes a long time.
Disclosure of Invention
The invention aims to provide an online nondestructive inspection method and device for an oil pipe, which adopt electromagnetic nondestructive inspection and are not affected by oil stains and the like. When the oil pipe is lifted for operation, online detection can be realized. Computer aided detection, Chinese interactive operation mode and convenient use. The method can detect cracks, holes, corrosion pits and wall thickness changes of the oil pipe, and has accurate qualitative and quantitative analysis.
The technical scheme of the invention is that the online nondestructive inspection detection device for the oil pipe comprises a wellhead assembly, wherein the wellhead assembly comprises: 11. a housing; 12. a centering follower; a measuring arm assembly kit, a connecting rod assembly kit; magnetization systems, peripherals; the peripheral equipment comprises a junction box, a signal conversion system, a signal acquisition and conditioning module, test software, a computer, an analog and digital signal transmission line and a probe 15; the magnetizing system is arranged at the lower part of the bottom plate; the centering follow-up mechanism comprises a guide wheel and a measuring roller, two measuring rollers are arranged to be in direct contact with the coiled tubing to be detected, an upper half detection unit and a lower half detection unit are arranged above and below the measuring roller of the measuring arm assembly suite, and the measuring arm assembly suite respectively comprises two semicircular magnetic flux leakage detection probes and 6-8 ellipticity detection probes, wherein the semicircular magnetic flux leakage detection probes and the ellipticity detection probes are of a hinged structure taking the coiled tubing as an axis (the coiled tubing), and a safety gap is kept between the surfaces of the coiled tubing to be detected. The shell can coat the centering follow-up mechanism; a measuring arm assembly kit, a connecting rod assembly kit; a magnetization system.
Furthermore, a hinge structure taking the oil pipe as a shaft is adopted, the whole structure consists of an upper half detection unit and a lower half detection unit, the upper half detection unit and the lower half detection unit are both two semi-rings which are connected in a shaft hinge mode, the hinge structure of the shaft hinge means that the two semi-rings are wound on the oil pipe as the shaft, and the other side of the oil pipe is connected through two loose locking hasps; the upper half detection unit and the lower half detection unit respectively comprise two semi-circular ring type magnetic flux leakage detection probes and 6-8 ellipticity detection probes.
In the hinge structure taking the oil pipe as an axis, the probe and the spring support of the detection unit are sequentially arranged at the axial position of the oil pipe; the flange plate is a bottom plate.
The device is provided with a connecting rod assembly kit which is arranged between an upper half detection unit and a lower half detection unit and comprises a connecting support, two cross rods and a rigid connecting rod, two cross rods are arranged at two ends of the rigid connecting rod and are respectively used for fixing shaft hinge structures of the upper half detection unit and the lower half detection unit, and flexible connection is established between the upper half detection unit and the peripheral equipment; one end of the connecting support is connected with peripheral equipment through a bolt; the other end of the connecting support of the connecting rod assembly suite is connected with the lower half detection unit by adopting a quick release pin; and when the coiled tubing to be detected swings up and down or left and right, synchronous position following is carried out.
A non-contact detection mode is adopted, in the detection process of the coiled tubing to be detected, 4-6 pairs of guide wheel pairs surrounding the tubing are arranged to clamp and guide the tubing to be detected, and two measuring rollers on a measuring arm assembly kit are in direct contact with the coiled tubing to be detected. The 4-6 pairs of guide wheel pairs can clamp the oil pipe to be tested in a transverse or vertical direction, and clamp and guide the oil pipe.
The method for detecting the oil pipe on-line nondestructive flaw detection device comprises the steps of carrying out computer nondestructive detection on flaws such as cracks, holes, corrosion pits and grooves on the surface and inside of the oil pipe by using the device, magnetizing the detected oil pipe by using a magnetizing system, generating a leakage magnetic field or magnetized main magnetic flux when the thickness of the surface of the oil pipe is changed by magnetizing and detecting the oil pipe by using a probe when the oil pipe passes through the detection device, acquiring the changes by flaw detection sensors, namely a probe of an upper half detection unit and a probe of a lower half detection unit, conditioning, shaping and amplifying the changes by using signals, converting the changes into digital signals by using an A/D (analog/digital) converter, and transmitting the digital signals to a computer, analyzing and processing the flaw detection signals by using flaw detection analysis software of the computer, displaying the signals in a curve form, and printing a detection result by using a printer.
The method can be used for detecting indoor oil pipes, can perform field detection while the oil pipes are lifted and lowered, automatically stores and prints detection results, and provides scientific basis for graded use or scrapping of old oil pipes.
Two structure of semicircle ring formula magnetic leakage test probe: the magnetic leakage probe shell comprises a shell body and a magnetic leakage detection device, wherein the shell body comprises a detection part, the detection part is provided with a containing groove, the inner surface of the containing groove forms a containing space, and the containing space is used for containing the Hall element module; the 6-8 ellipticity detection probes are also Hall elements and are uniformly distributed on the circumference of the detection unit, three to four Hall elements are distributed on each half circumference, and two to three groups of signal outputs are given.
The magnetizing system in the wellhead assembly in the device can be arranged below the bottom plate. The analog and digital signal transmission line is connected with the signal conversion system, the signal acquisition and conditioning module, the test software and the computer; by adopting a non-contact detection mode, in the detection process of the coiled tubing to be detected, only 8-12 guide wheels and two measuring rollers on a measuring arm assembly kit are in direct contact with the coiled tubing to be detected, and a certain safety gap is kept between each of two semi-circular magnetic flux leakage detection probes and 6 ovality detection probes and the surface of the coiled tubing to be detected, so that the detection is not influenced by factors such as dirt, oil sludge and the like; the device adopts a hinged design, the whole structure consists of an upper half detection unit and a lower half detection unit, one side of the upper half detection unit and one side of the lower half detection unit are connected in a hinged mode through a rotating shaft, and the other side of the upper half detection unit and the other side of the lower half detection unit are connected through two locking hasps. Can be installed and disassembled at any time, and is very convenient and quick to use on site. The device can carry out computer nondestructive detection on the defects of cracks, holes, corrosion pits, grooves and the like on the surface and inside of the oil pipe, can be used for detecting the indoor oil pipe, can carry out field detection while the oil pipe is lifted and lowered, and can automatically store and print the detection result, thereby providing scientific basis for grading use or scrapping of the old oil pipe.
The connecting rod assembly suite arranged on the lower half detection unit comprises a connecting support, two cross-shaped rods and a rigid connecting rod, wherein the connecting support is connected with peripheral equipment through bolts. In order to facilitate the mounting and dismounting operations, the other end of the connecting rod assembly kit is connected with the lower half detection unit of the device by adopting a quick release pin. Two cross-shaped rods are arranged at two ends of the rigid connecting rod, so that flexible connection is established between the device and peripheral equipment, and when the coiled tubing to be detected swings up and down or left and right, synchronous position following can be carried out.
Has the advantages that: in the detection process of the coiled tubing to be detected, only 8-12 guide wheels and two measuring rollers on a measuring arm assembly kit are in direct contact with the coiled tubing to be detected, and two semi-circular magnetic flux leakage detection probes and 6 ellipticity detection probes keep a certain safety gap with the surface of the coiled tubing to be detected and are not influenced by factors such as dirt, oil sludge and the like; the device adopts a hinged design, the whole structure consists of an upper half detection unit and a lower half detection unit, one side of the upper half detection unit and one side of the lower half detection unit are connected in a hinged mode through a rotating shaft, and the other side of the upper half detection unit and the other side of the lower half detection unit are connected through two locking hasps. Electromagnetic nondestructive detection is adopted, and the method is not influenced by oil stains and the like. When the oil pipe is lifted for operation, online detection can be realized. Computer aided detection, Chinese interactive operation mode and convenient use. The method can detect cracks, holes, corrosion pits and wall thickness changes of the oil pipe, and has accurate qualitative and quantitative analysis. And (4) visually displaying and printing a curve. The detection is convenient and the data is correct and reliable. Can replace the existing detection method technology.
Drawings
FIG. 1 is a schematic block diagram of an on-line nondestructive inspection tool for oil pipes according to the present invention;
FIG. 2 is a block diagram of the wellhead installation of the present invention;
FIG. 3 is a schematic diagram of a signal line connection method.
FIG. 4 illustrates a test software host interface;
FIG. 5 shows a waveform of an oil pipe body with eccentric wear defects;
figure 6 shows the defect wave shape of the hole or crack existing in the oil pipe body.
Detailed Description
The method of the invention detects the flaw detection principle: as shown in figure 1, the magnetizing system magnetizes the oil pipe to be tested, when cracks, pits, holes and wall thickness of the oil pipe change, a leakage magnetic field or magnetized main magnetic flux changes, the changes are acquired by a flaw detection sensor, the changes are conditioned, shaped and amplified by signals, then the signals are converted into digital signals through A/D (analog/digital) and transmitted into a computer, and the computer analyzes and processes the defect signals through flaw detection analysis software, displays the defect signals in a curve form, and can also print the detection result through a printer.
As shown in FIG. 2, an online nondestructive inspection method and device for oil pipe, the wellhead assembly is composed of: the well head assembly includes: 11. a housing; 12. a centering follower (traveling body); 13. a junction box; 14. a base. A probe 15, a spring 16 and a flange 17. The magnetization system may be below the bottom plate. The system comprises a signal conversion system, a signal acquisition and conditioning module, test software and a computer; analog and digital signal transmission lines.
The installation method comprises the following steps: the centering follow-up mechanism is the key for the normal work of the device, and has the function that when the irregular swinging occurs in the lifting process of the oil pipe, the centering follow-up mechanism ensures that the probe is tightly attached to the outer wall of the oil pipe and swings together with the oil pipe, and the pickup of effective signals is ensured. The installation structure is shown in figure 2.
The Christmas tree is dismantled to the large four-way bottom flange and then the tubing head is taken out, the first tubing in the well is hoisted to be suspended after being broken off, then the wellhead device is seated on the elevator, the hoisted tubing is screwed into the wellhead device and connected with the coupling seated on the elevator, the tubing is lifted up after being tightened to take out the elevator, and the rack assembly is fastened on the large four-way bottom flange through bolts, as shown in figure 2. 11 shells, 12, a centering follow-up device, 13, a wiring plate, 14, a bottom plate, 15, a probe assembly, 16 radial spring components, 17 flange plates and 18 oil pipes.
The method for the online nondestructive inspection of the oil pipe by the online nondestructive inspection detection device of the oil pipe is directly installed on a well head, completes the detection task along with the lifting process of the oil pipe, does not need to additionally add an operation program, and has the advantages of time saving, labor saving and the like. Adopting a 12-channel detection probe for detecting transverse magnetic flux leakage; the method comprises the following steps of (1) longitudinally detecting magnetic flux leakage by using an 8-channel detection probe, applying mutually orthogonal magnetization fields, and distinguishing various defects by using a two-dimensional magnetic flux leakage detection technology; a magnetic aggregation technology is adopted, so that the probability of missed detection is zero; the software can automatically store data and visually display a measurement curve on site.
With both the signal converter and the computer powered down, the signal lines between the rack assembly, the converter and the computer are connected as shown in FIG. 3. 1-12 core aviation plugs; 2-analog signal lines; 3-a power switch; 4-power indicator light; 5-USB cable flat port; 6-USB cable; 7-5 core aviation plugs; 8-12 core aviation plug.
And (3) detection process: and turning on a power switch on the front panel of the signal converter, and then turning on a power indicator lamp. After the computer is started, opening oil pipe detection (shortcut) on the desktop, and entering detection software; entering into the data acquisition menu of FIG. 4 (Main interface) according to prompts on the software interfaceStart of collection。
Preparation before logging detection
1. All signal wires of the device are connected, a computer is started and then enters a detection software interface, a power switch of a signal converter is turned on, signal acquisition is carried out after a probe is calibrated, in the acquisition process, a screwdriver or a thin iron bar is used for sequentially checking the probe, and whether the detection curve of each probe is normal is observed, so that the device is proved to work normally. If abnormity or crash occurs, checking whether all connecting wires are loose or the power supply of the signal converter is not started.
2. And sequentially putting all the components into a tool box, checking tools and auxiliary articles, and placing a wellhead device.
3. The reason of operating the oil well is known in detail, whether an underground tool with the outer diameter larger than phi 110mm exists in a tubular column in the well is known, and if the underground tool exists, a wellhead device needs to be detached for avoiding so as to avoid accidents caused by pulling the wellhead device bad.
Second, detection of oil pipe in well
1. The method comprises the steps of firstly connecting a signal wire into a wellhead device, connecting 2-4 flange screws, leading the wellhead device into a large four-way bottom flange, tightening a nut, shoveling 1 ditch out of the side of the wellhead by using a shovel, and placing the signal wire into the ditch and covering the signal wire with soil.
2. And sequentially connecting each signal wire and each power wire, turning on a computer, entering a detection software interface, turning on a power switch of a signal converter, calibrating the probe when the oil pipe in the well is lifted to a position 2-3 m away from the well mouth, after the calibration is finished, placing the oil pipe in the well, starting normal lifting operation, and starting and stopping the detection software by a detector according to the lifting speed of the oil pipe.
3. Carefully observing the detection curve of each oil pipe, timely eliminating the oil pipes with overproof defects, and rechecking the pipes with problems (the rechecking speed is controlled to be about 20 s/pipe) to ensure the detection accuracy; and after detecting the oil pipe in the well, compiling and storing the file name.
4. After the above operations are completed, when the oil pipe begins to be lifted, the enter key is pressed according to the interface prompt to begin data acquisition, and after one detection is finished, the enter key is quickly pressedBlank spaceThe bond is bound to the current collection, so that the waveform diagram of the current detection result can be seen. Then press againCarriage returnThe key is entered into the next acquisition and so on. The oscillogram collected each time is automatically recorded by different current tube numbers for viewing.
5. When the detection is required to be stopped, clicking can be performedStopping collection(or pressing F5 key), pressing exit system exit detection;
6. after the detection is finished, the waveform diagram of the detected oil pipe can be checked by opening the previously collected data file, the detection waveform diagrams of the oil pipes with different pipe numbers can be turned up and down by using left and right cursor keys, and at the moment, if screen waveforms are printed, only a printing button needs to be clicked under the condition that the printer is ready.
7. Analysis of detection results
If all the channels of the waveform of the detected oil pipe are smooth, no obvious peak and no waveform convex-concave change show that the oil pipe body has no obvious defect;
if the waveform of the detected oil pipe is similar to a square waveform (as shown in fig. 5), indicating that the pipe body of the oil pipe has an eccentric wear defect; if the waveform of the detected oil pipe is as the following figure (spike wave), the oil pipe is indicated to have a hole or crack defect;
maintenance
1. After each well is detected, cleaning all parts of the wellhead device by using diesel oil, and enabling each probe to move freely; and wiping the signal wires by using clean gauze and dipping a little water, connecting each signal wire, checking whether the device works normally, rolling the signal wires, and finishing the toolbox.
2. And (4) coating grease on the steel ball, assembling a wellhead device, and placing the wellhead device at a dry and ventilated place.
3. And compiling an oil pipe detection report, and storing the detection data and the report into a designated desktop computer.
4. The Christmas tree is dismantled to the large four-way bottom flange and then the tubing head is taken out, the first tubing in the well is hoisted to be suspended after being broken off, then the wellhead device is seated on the elevator, the hoisted tubing is screwed into the wellhead device and connected with the coupling seated on the elevator, the tubing is lifted up after being tightened to take out the elevator, and the wellhead assembly is fastened on the large four-way bottom flange through bolts, as shown in figure 1.
5. In the case of the signal converter and computer power being turned off, the signal lines between the wellhead assembly, the converter and the computer are connected as shown in fig. 2.
6. Installing a wellhead assembly:
a. and adjusting the derrick to ensure that the well deviation is less than 5 mm.
b. And hoisting a first oil pipe in the well, hanging the first oil pipe after the first oil pipe is broken out, then, seating the wellhead device on an elevator, screwing the hoisted oil pipe into the wellhead device to be connected with a coupling seated on the elevator, lifting the oil pipe after the tubing is tightened, taking out the elevator, and fastening a wellhead assembly on a large four-way bottom flange by using bolts.
c. And lifting the oil pipe. And then normal rod taking operation and detection are carried out.
7. Before each use of the device, 7M 12 hexagonal screws on the base were tightened. And then firmly installing the wellhead device on a wellhead, then detaching the junction box cover, penetrating the analog signal wire through a round hole below the junction box cover, installing and screwing the 12-core aviation plug, then installing and screwing the junction box cover, and checking whether the seal is intact. After the detection is finished, the junction box cover is detached, the 12-core aviation plug is loosened, the 12-core aviation plug of the analog signal line is screwed up by the protective cap, and oil and water are prevented from entering.
8. The equipment adopts a USB interface, and oil pipes are sequentially detected and orderly arranged in the detection process so as to conveniently eliminate defective oil pipes;
9. the oil pipe lifting device can be directly installed on a well head, detection tasks can be completed along with the oil pipe lifting process, no additional operation program is needed, and the oil pipe lifting device has the advantages of time saving, labor saving and the like. Adopting a 12-channel detection probe for detecting transverse magnetic flux leakage; the method comprises the following steps of (1) longitudinally detecting magnetic flux leakage by using an 8-channel detection probe, applying mutually orthogonal magnetization fields, and distinguishing various defects by using a two-dimensional magnetic flux leakage detection technology; a plurality of magnetic sensors are used for gathering, so that the probability of missed detection is zero; the software can automatically store data and visually display a measurement curve on site.
The main technical indexes are as follows:
1. the diameter range of the measured oil pipe is as follows: 27/8 ", 31/2";
2. transverse crack resolution was (smooth surface): 0.3mm (depth) × 5mm (length);
3. etch pit and hole resolution: phi is 1.2 mm;
4. wall thickness wear resolution: 5% of the wall thickness;
5. detecting blind areas at two ends of the oil pipe: less than or equal to 80 mm;
6. detecting speed: 1-60 m/min;
7. the working temperature of the sensor is as follows: -40 ℃ to 85 ℃, humidity: 0-90%;
8. working temperature of the signal processing system: -10 ℃ to 40 ℃, humidity: 0-40%;
9. the external dimension is as follows: phi 380mm is multiplied by 310 mm;
10. weight: 96 kg;
11. power supply: AC: 220V +/-10 percent and 50Hz +/-5 percent;
12. rated power: 50W;
13. maximum drift diameter: phi 110 mm.
14. Hole drilling: phi 1.5mm through hole
15. Blind hole: phi 3mm x 1mm
16. Inner wall eccentric wear (to oil pipe only): 1mm (width) × 1.5mm (depth) × 35mm (length)
17. Inner wall corrosion ring groove (for oil pipe only): 1mm (width) × 1.5mm (depth)
18. Eccentric wear of the whole inner wall: 5mm (width) × 1.5mm (depth)
19. Inner wall corrosion pit: phi 30mm
20.4, detecting blind area 60mm (except pipe hoop and screw thread)
21.5, working temperature: minus 30 ℃ to plus 40 DEG C
22.6 working power supply: AC 220V 50Hz
23. The oil pipe on-line nondestructive inspection tool structure schematic diagram.
Claims (8)
1. An online nondestructive flaw detection device for an oil pipe is characterized by comprising a wellhead assembly, wherein the wellhead assembly comprises a shell, a centering follow-up mechanism, a measuring arm assembly external member, a connecting rod assembly external member, a magnetization system and peripheral equipment; the peripheral equipment comprises a junction box, a signal conversion system, a signal acquisition and conditioning module, test software, a computer and an analog and digital signal transmission line; the magnetizing system is arranged at the lower part of the bottom plate; the centering follow-up mechanism comprises a guide wheel and a measuring roller, two measuring rollers are arranged to be in direct contact with the coiled tubing to be detected, an upper half detection unit and a lower half detection unit are arranged above and below the measuring roller of the measuring arm assembly suite, the measuring arm assembly suite respectively comprises two magnetic flux leakage detection probes and an ellipticity detection probe which are hinged around a pair of semicircular shafts of the coiled tubing, and a safety gap is kept between the magnetic flux leakage detection probes and the ellipticity detection probes and the surface of the coiled tubing to be detected.
2. The oil pipe online nondestructive inspection device of claim 1, wherein a hinge structure taking the oil pipe as a shaft is adopted, the whole structure is composed of an upper half detection unit and a lower half detection unit, the upper half detection unit and the lower half detection unit are both two semi-rings connected in a shaft hinge manner, the hinge structure of the shaft hinge means that the two semi-rings are wound on the oil pipe as the shaft, and the other side of the oil pipe is connected through two loose locking hasps; the upper half detection unit and the lower half detection unit respectively comprise two semi-circular ring type magnetic flux leakage detection probes and 6-8 ellipticity detection probes.
3. The oil pipe online nondestructive inspection device of claim 2, wherein in the structure hinged around the oil pipe as an axis, the probe and the spring support of the inspection unit are sequentially arranged around the oil pipe as an axis; the flange plate is a bottom plate.
4. The online nondestructive inspection device for the oil pipe according to claim 1, wherein a connecting rod assembly kit is provided and is installed between the upper half inspection unit and the lower half inspection unit, the connecting rod assembly kit comprises a connecting support, two cross bars and a rigid connecting rod, two cross bars are installed at two ends of the rigid connecting rod and are respectively used for fixing the shaft hinge structures of the upper half inspection unit and the lower half inspection unit, and flexible connection is established between the upper half inspection unit and the lower half inspection unit and peripheral equipment; one end of the connecting support is connected with peripheral equipment through a bolt; the other end of the connecting support of the connecting rod assembly suite is connected with the lower half detection unit by adopting a quick release pin; and when the coiled tubing to be detected swings up and down or left and right, synchronous position following is carried out.
5. The oil pipe online nondestructive inspection device of claim 1, wherein 4-6 pairs of guide wheel pairs surrounding the oil pipe are arranged to clamp and guide the oil pipe to be inspected during the inspection of the coiled oil pipe to be inspected by adopting a non-contact inspection mode, and two measurement rollers on the measurement arm assembly kit are in direct contact with the coiled oil pipe to be inspected. The 4-6 pairs of guide wheel pairs can clamp the oil pipe to be tested in a transverse or vertical direction, and clamp and guide the oil pipe.
6. The method for detecting the oil pipe online nondestructive inspection device according to one of claims 1 to 5, it is characterized in that the device can carry out computer nondestructive detection on the defects of cracks, holes, corrosion pits and grooves on the surface and inside of the oil pipe, the magnetization system magnetizes the detected oil pipe, when the oil pipe passes through the detection device, is magnetized and detected by the probe, the surface of the oil pipe has cracks, pits and holes, and the wall thickness of the oil pipe changes, a leakage magnetic field or the main magnetic flux of the magnetized oil pipe changes, the changes are acquired by the probes of the upper half detection unit and the lower half detection unit, and after signal conditioning, shaping and amplifying, then the signals are converted into digital signals by A/D and transmitted to a computer, the computer analyzes and processes the defect signals by flaw detection analysis software, and the defect signals are displayed in a curve form, and a detection result can be printed by a printer.
7. The method as claimed in claim 6, wherein the method can be used for detecting indoor oil pipes and can be used for field detection while the oil pipes are taken up and down, and the detection result is automatically stored and printed, thereby providing scientific basis for grading use or abandonment of old oil pipes.
8. The method as claimed in claim 6, wherein the two semicircular magnetic flux leakage detecting probes are structured as follows: the magnetic leakage probe shell comprises a shell body and a magnetic leakage detection device, wherein the shell body comprises a detection part, the detection part is provided with a containing groove, the inner surface of the containing groove forms a containing space, and the containing space is used for containing the Hall element module; the 6-8 ellipticity detection probes are also Hall elements and are uniformly distributed on the circumference of the detection unit, three to four Hall elements are distributed on each half circumference, and two to three groups of signal outputs are given.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112816544A (en) * | 2020-12-31 | 2021-05-18 | 中国石油大学(华东) | Worm-gear type detection probe carrying device and oil pipe field electromagnetic flaw detection method |
| CN112816543A (en) * | 2020-12-31 | 2021-05-18 | 中国石油大学(华东) | Electric control type detection probe carrying device and oil pipe field electromagnetic flaw detection method thereof |
| CN112834604A (en) * | 2020-12-31 | 2021-05-25 | 中国石油大学(华东) | Gear type detection probe carrying device and oil pipe field electromagnetic flaw detection method thereof |
| CN112858467A (en) * | 2021-04-09 | 2021-05-28 | 中国石油大学(华东) | Rotating electromagnetic field pipeline crack detection probe and detection system in any direction |
| CN117849165A (en) * | 2024-03-07 | 2024-04-09 | 西南石油大学 | Oil pipe flaw detection device for workover site |
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