CN111102945A - Device and method for detecting wall thickness of continuous oil pipe on site - Google Patents
Device and method for detecting wall thickness of continuous oil pipe on site Download PDFInfo
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- 210000004907 gland Anatomy 0.000 claims description 22
- 239000000523 sample Substances 0.000 claims description 20
- 239000007788 liquid Substances 0.000 claims description 10
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- 238000011065 in-situ storage Methods 0.000 claims description 7
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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
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/02—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring thickness
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses a device and a method for detecting the wall thickness of a continuous oil pipe on site, which can provide comprehensive and accurate basic data for flaw detection and fatigue life prediction of the continuous oil pipe and guarantee the safe operation of the continuous oil pipe by monitoring the wall thickness of the continuous oil pipe in real time. The method comprises the following steps: the kettle body comprises an outer wall and a bottom wall, wherein an annular kettle body inner groove is formed in the bottom wall, a kettle body outer groove is formed between the kettle body inner groove and the outer wall, a plurality of adjusting screw holes are radially formed in the outer wall, and ultrasonic detectors are respectively installed in the adjusting screw holes; the sealing and pressurizing cover is provided with an inner groove of the sealing and pressurizing cover and an outer groove of the sealing and pressurizing cover, the outer groove wall of the outer groove of the sealing and pressurizing cover covers the outer wall of the kettle body and is in threaded fit sealing, and the upper end of the sealing and pressurizing cover is provided with a connector for connecting an automatic screwing device; and two ends of the rubber ring are respectively positioned in the inner groove of the kettle body and the inner groove of the sealing pressurizing cover.
Description
Technical Field
The invention relates to the technical field of coiled tubing safety in oil and gas engineering, in particular to a device and a method for detecting the wall thickness of a coiled tubing on site.
Background
The continuous oil pipe is easy to cause fatigue damage in the continuous oil pipe due to the reduction of the wall thickness in the working process, so that the continuously reduced wall thickness in the working process of the continuous oil pipe is timely, accurately and comprehensively monitored, and the method has important significance for timely maintaining the continuous oil pipe, preventing safety accidents and improving the use times of the continuous oil pipe. At present, the existing method is to predict the wall thickness of the coiled tubing after working based on an empirical model established by laboratory data or to detect the wall thickness of the coiled tubing periodically. Due to the fact that the application range of the experience prediction model is limited, the wall thickness of the coiled tubing during working cannot be accurately, timely and comprehensively monitored by the regular detection method, the device and the method for detecting the wall thickness of the coiled tubing on site are provided, the wall thickness can be continuously, accurately and nondestructively detected on site, and timely, accurate and comprehensive basic data are provided for fatigue life prediction of coiled tubing operation. Can well solve the problems of the prior art.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a device and a method for detecting the wall thickness of a continuous oil pipe on site, which can provide comprehensive and accurate basic data for flaw detection and fatigue life prediction of the continuous oil pipe and guarantee the safe operation of the continuous oil pipe by monitoring the wall thickness of the continuous oil pipe in real time,
the purpose of the invention is realized as follows:
an apparatus for in situ wall thickness measurement of coiled tubing, comprising:
the continuous oil pipe continuous-flow continuous;
the continuous oil pipe is arranged in the central hole of the sealing and pressurizing cover, the lower end of the sealing and pressurizing cover is provided with an inner groove of the sealing and pressurizing cover and an outer groove of the sealing and pressurizing cover, the inner groove of the sealing and pressurizing cover corresponds to the inner groove of the kettle body, the outer groove of the sealing and pressurizing cover corresponds to the outer groove of the kettle body, the outer groove wall of the outer groove of the sealing and pressurizing cover covers the outer wall of the kettle body and is in thread fit sealing, and the upper end of the sealing and pressurizing cover is provided with a connector for connecting an automatic screwing device;
the two ends of the rubber ring are respectively positioned in the inner groove of the kettle body and the inner groove of the sealing pressurizing cover, the rubber ring, the outer groove of the kettle body, the outer groove of the sealing pressurizing cover and the outer wall enclose a hydraulic cavity, and an ultrasonic probe of the ultrasonic detector is in contact with the rubber ring.
Preferably, the rubber ring is in interference fit with an inner groove of the kettle body and an inner groove of the sealing and pressurizing cover.
Preferably, an annular piston is arranged in the outer groove of the sealing and pressurizing cover, and a plurality of fixing rods are arranged at the bottom of the outer groove of the sealing and pressurizing cover and used for fixing the annular piston.
Preferably, the ultrasonic probe is in threaded fit sealing with the adjusting screw hole.
Preferably, the inner groove of the kettle body and the inner groove of the sealing pressure cover are both in open conical shapes.
Preferably, the groove width of the inner groove of the kettle body is smaller than that of the outer groove of the kettle body.
Preferably, a plurality of fixing screw holes are circumferentially distributed on the bottom wall of the kettle body and used for fixing the device, and each fixing screw hole is positioned on the outer side of the outer wall of the kettle body.
Preferably, the material of the rubber ring is wear-resistant rubber.
A method of in situ wall thickness measurement of a coiled tubing string, comprising:
s1, placing the rubber ring into a groove in the kettle body, installing the ultrasonic detector in place, filling liquid into the hydraulic cavity, and fixing the annular piston in the groove outside the sealing gland;
s2, aligning the sealing pressure cover with the rubber ring, screwing the sealing pressure cover, connecting the sealing pressure cover with the kettle body through screw thread, forming interference seal by the rubber ring, the inner groove of the sealing pressure cover and the inner groove of the axe body to form enough sealing pressure, forming seal for the sealing pressure cover and the kettle body, wherein the pressure in the hydraulic cavity is p, and the initial screwing torque is T0Then, in the hydraulic chamber sealing process, the total acting force on the sealing gland is as follows:
Fp＝App
in the formula, Ap-hydraulic chamber cross-sectional area; p-hydraulic chamber pressure; fp-the total force of the hydraulic chamber pressure on the sealing gland;
the additional thread-on torque generated by the force on the seal gland is calculated by the rotating shoulder fire equation:
wherein:
in the formula, P is the thread pitch of the sealing thread; mu.stCoefficient of friction of thread flanks α angle of thread flank bearing surface Rt-sealing thread friction torque equivalent force arm; e7-pitch diameter of the thread; g-length of incomplete thread; l is7-full thread length; t is ts-the taper of the thread in diameter;
s3, the sealing thread is buckled through the automatic buckling device, liquid is continuously pressurized, the rubber ring is deformed under the pressure action of the hydraulic chamber and then clings to the coiled tubing, and the relation between the total buckling torque and the pressure of the liquid chamber in the pressurizing process is as follows:
s4, enabling the ultrasonic sensor probes to cling to the outer wall of the rubber ring and emit ultrasonic waves according to set frequency and intensity, continuously measuring the time of the ultrasonic waves emitted by each probe reaching the interface of the rubber ring and the continuous oil pipe and the time of the ultrasonic waves transmitted by each probe in the continuous oil pipe, and obtaining monitoring images of the ultrasonic detectors after the time reaches the design time;
s5, analyzing the images, wherein the front-section images can generate small and stable amplitude and are transmission images of sound waves in the rubber ring, when the sound waves are transmitted to the outer wall of the coiled tubing for the first time, the images can generate large amplitude due to different media, and the time for sudden change of the amplitude for the first time is defined as t0The sound wave is transmitted to the inner wall of the coiled tubing for reflection and then transmitted to the rubber ring along with the outer wall, the amplitude slowly tends to be stable, and the time when the amplitude tends to be stable is determined as t1At the moment, the sound wave is transmitted in the coiled tubing in one period;
the propagation velocity of sound in the coiled tubing is set as vsCalculating the wall thickness of the coiled tubing according to the following formula;
in the formula, d is the measured thickness of the coiled tubing; t is t0-initial time of propagation of the ultrasonic waves to the outer wall of the tubing; t is t1-end of ultrasonic propagation response time in the tubing; v. ofs-the speed of sound propagation in the tubing.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
the device can be assembled and disassembled with an external fixed rivet, can realize continuous, accurate and nondestructive wall thickness detection on site, provides accurate basic data for predicting the fatigue life of the coiled tubing operation, and is also suitable for coiled tubing of various specifications or straight tubes and bent tubes made of other materials.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for in-situ wall thickness measurement of a coiled tubing according to the present invention;
FIG. 2 is a top view of the apparatus for in situ wall thickness measurement of coiled tubing according to the present invention;
FIG. 3 is a detailed view of the kettle body and the sealing and pressurizing cover of the device for detecting the wall thickness of the continuous oil pipe on site.
Detailed Description
As shown in fig. 1 to 3, an apparatus and a method for detecting a wall thickness of a coiled tubing in situ according to an embodiment of the present invention includes: the kettle body 5 comprises an annular outer wall 5-3 and a bottom wall 5-4, wherein central holes of the outer wall and the bottom wall are used for continuous oil pipes to pass through and are processed according to the designed size, annular kettle body inner grooves are formed in the bottom wall, kettle body outer grooves 5-2 are formed between the kettle body inner grooves 5-1 and the outer wall, the kettle body inner grooves are 5-1 narrow, and the kettle body outer grooves are 5-2 wide; the lower part of the kettle body 5 is provided with a fixing screw hole 10 at the peripheral extension part, the device can be fixed through the fixing screw hole 10, 12 adjusting screw holes are uniformly distributed at the middle part of the kettle body 5 along the peripheral direction, 1 ultrasonic probe 7 is placed in each adjusting screw hole, and the adjusting screw holes are connected through sealing threads to ensure the sealing property; the sealing and pressurizing cover 2 is processed according to the design size, the shape of the sealing and pressurizing cover 2 is an inner annular groove 2-1 and an outer annular groove 2-2 of the sealing and pressurizing cover, the inner groove 2-1 of the sealing and pressurizing cover is tapered, the taper is 1: 32-1: 16, the inner groove 2-1 of the sealing and pressurizing cover corresponds to the inner groove 5-1 of the kettle body, the outer groove 2-2 of the sealing and pressurizing cover is slightly larger than the outer groove 5-2 of the kettle body and can be in threaded sealing connection with the outer groove 5-2 of the kettle body, the inner part of the outer groove 2-2 of the sealing and pressurizing cover is connected with an annular piston 4 by a fixed rod 3, the sealing and pressurizing cover 2 is provided with a joint externally connected with an automatic screwing device 11, the fixed rod 3, the joint externally connected with the automatic screwing device 11 and the sealing and pressurizing cover 2 are integrally connected, the fixing rods 3 are 8-12 and are uniformly distributed on the sealing gland 2, fixed with the sealing gland 2 and fixed with the annular piston 4; the annular piston is slightly smaller than the outer groove of the sealing gland and has a cross section in a shape close to a trapezoid, the annular piston partially extends into the outer groove 5-2 of the kettle body, and the annular piston is used for enabling the hydraulic chamber to generate pressure when contacting liquid surface. The inner diameter of the annular piston 4 is slightly smaller than that of the outer groove 2-2 of the sealing gland, so that the annular piston 4 is conveniently arranged in the outer groove 2-2 of the sealing gland; wear-resistant rubber rings 8 are placed in the kettle body inner groove 5-1 and the sealing pressure cover inner groove 2-1, are annular in shape, have tapers at two ends and are matched with the sealing pressure cover inner groove 2-1, and are matched with the kettle body inner groove 5-2 and the sealing pressure cover inner groove 2-1 in size; an ultrasonic detector 6 is arranged in the middle of the periphery of the kettle body 5, the ultrasonic detector 6 is connected with the kettle body 5 through threads and can be sealed, and an ultrasonic probe 7 is always tightly attached to the wall of the wear-resistant rubber ring 8 in work; the method comprises the steps that a coiled tubing 1 to be detected is arranged in a circular hollow part, a hydraulic chamber 9 is used for pressurizing to enable a wear-resistant rubber ring 8 to slowly and uniformly contact the coiled tubing 1 in the monitoring process, ultrasonic waves are emitted by an ultrasonic sensor probe 7 in a mode of being tightly attached to the outer wall of the wear-resistant rubber ring 8 according to certain frequency and strength in the process, the time of each probe receiving the ultrasonic waves to reach the interface between the wear-resistant rubber ring 8 and the coiled tubing 1 and the time of the ultrasonic waves to propagate in the coiled tubing 1 are obtained through continuous measurement, the outer diameter and the wall thickness of the coiled tubing 1 in the axial direction and the circumferential direction can be calculated, and comprehensive and accurate; a space formed by the kettle body 5, the sealing gland 2, the wear-resistant rubber ring 8 and the annular piston 4 is a hydraulic chamber 9, and the hydraulic chamber 9 can generate pressure through an external automatic buckling device 11 on the sealing gland 2, so that the wear-resistant rubber ring 8 is deformed; the whole device is fixed on site through a fixing screw hole 10 on the kettle body 5.
The method for detecting the wall thickness of the continuous oil pipe on site, provided by the embodiment of the invention, comprises the following steps:
step one, processing a kettle body 5 and a sealing and pressurizing cover 2 according to the design size;
step two, mounting the annular piston 4 on the fixing rod 3 on the sealing gland 2;
and step three, putting the wear-resistant rubber ring 8 into a groove 5-1 in the kettle body, installing the ultrasonic detector 6 in place, and filling liquid into the hydraulic chamber 9.
Aligning the sealing and pressurizing cover 2 to the wear-resistant rubber ring 8 and screwing the sealing and pressurizing cover 2, and simultaneously connecting the sealing and pressurizing cover 2 with the kettle body 5 through threads, wherein the wear-resistant rubber ring 8 and the sealing and pressurizing cover are connected through the threadsThe cover inner groove 2-1 and the axe inner groove 5-1 form interference sealing to form enough sealing pressure, the sealing pressure-applying cover 2 and the kettle body 5 are sealed at the same time, the pressure in the hydraulic chamber 9 is p, and the initial fastening torque is T0Then, in the sealing process of the hydraulic chamber 9, the total acting force on the sealing gland 2 is:
Fp＝App
in the formula ApHydraulic chamber cross-sectional area, mm2；
p is the pressure of the hydraulic chamber, MPa;
Fpthe total force, N, exerted by the hydraulic chamber pressure on the sealing gland.
The additional thread-on torque generated by the force on the sealing gland 2 can be calculated by the rotary shoulder Fall formula
Wherein:
in the formula, P represents the thread pitch of the sealing thread, and is mm;
μt-coefficient of thread surface friction, dimensionless;
α -bearing surface angle of thread;
Rt-sealing thread friction torque equivalent moment arm, mm;
E7-pitch diameter of the thread, mm;
g is the length of the incomplete thread, mm;
L7-full thread length, mm;
ts-taper of the thread in diameter, mm/mm.
Step five, sleeving the continuous oil pipe 1 into the whole device, and fixing the whole device through a fixing screw hole 10;
step six, before the coiled tubing 1 works, the computer software for connecting the ultrasonic detector 6 with the analysis device 12 is opened and tested, and after the test is finished, if the coiled tubing can work normally, the coiled tubing enters a state to be tested;
step seven, the sealing thread is buckled through the external automatic buckling device 11, liquid is continuously pressurized, the wear-resistant rubber ring 8 deforms under the action of the pressure of the cavity and then clings to the continuous oil pipe 1, and the relation between the total buckling torque and the pressure of the liquid cavity 9 in the pressurizing process is as follows:
step eight, the ultrasonic sensor probes 7 are tightly attached to the outer wall of the wear-resistant rubber ring 8 and emit ultrasonic waves according to a certain frequency (the frequency is related to the oil pipe lifting speed and the axial measurement precision) and strength, the time for the ultrasonic waves emitted by each probe to reach the interface between the wear-resistant rubber ring 8 and the continuous oil pipe 1 and the time for the ultrasonic waves to propagate in the continuous oil pipe 1 are obtained through continuous measurement, and the monitoring images of the ultrasonic detectors 6 are stored after the design time is reached;
analyzing the images, wherein the front section images can generate small and stable amplitude and are transmission images of sound waves in the wear-resistant rubber ring 8, when the sound waves are transmitted to the outer wall of the continuous oil pipe 1 for the first time, the images can generate large amplitude due to different media, and the time for sudden change of the amplitude for the first time is defined as t0The sound wave is transmitted to the inner wall of the coiled tubing 1 and then reflected, and then transmitted to the outer wall and then propagated to the wear-resistant rubber ring 8, the amplitude slowly tends to be stable, and the time when the amplitude tends to be stable is determined as t1At the moment, the sound wave is transmitted in the coiled tubing 1 for one period;
step ten, setting the propagation speed of sound in the coiled tubing 1 (namely the propagation speed of sound in steel) as vsCalculating the wall thickness according to the following formula;
d: measuring the thickness of the coiled tubing in mm;
t0: the initial time us when the ultrasonic wave is transmitted to the outer wall of the oil pipe;
t1: the response time us when the ultrasonic wave is propagated in the oil pipe;
vs: the speed of sound propagation in the tubing, km/s.
Step eleven, continuously measuring the wall thickness of the coiled tubing along the axial direction by continuously transmitting ultrasonic waves in the whole lifting-out or lowering-in process of the coiled tubing 1. Meanwhile, when the wall thickness is smaller than a specified value, the dangerous section alarm is realized through software.
And step twelve, the device can provide comprehensive and accurate basic data for flaw detection and fatigue life prediction of the continuous oil pipe 1 by monitoring the wall thickness of the continuous oil pipe 1 in real time, and provides guarantee for safe operation of the continuous oil pipe 1.
The device for detecting the wall thickness of the continuous oil pipe on site provided by the embodiment of the invention comprises: the device comprises a continuous oil pipe, a sealing gland, a fixed rod, an annular piston, a kettle body, an ultrasonic detector, an ultrasonic probe, a wear-resistant rubber ring, a screw hole, an external automatic buckling device and the like. The gaps among the sealing pressurizing cover, the kettle body and the wear-resistant rubber ring form a hydraulic chamber, and the hydraulic chamber generates stable pressure through the external automatic buckling device of the sealing pressurizing cover, so that the wear-resistant rubber ring can be tightly attached to the outer wall of the continuous oil pipe when the continuous oil pipe passes through the hydraulic chamber. The ultrasonic sensor probes are tightly attached to the outer wall of the wear-resistant rubber ring and emit ultrasonic waves according to certain frequency and strength, the time of the ultrasonic waves of each probe reaching the interface of the wear-resistant rubber ring and the continuous oil pipe and the time of the ultrasonic waves of each probe transmitting in the continuous oil pipe are obtained through continuous measurement, and therefore the outer diameter and the wall thickness of the continuous oil pipe along the axial direction and the circumferential direction are calculated. The whole device can be assembled and disassembled with an external fixed rivet, can realize continuous, accurate and nondestructive wall thickness detection on site, provides accurate basic data for predicting the fatigue life of coiled tubing operation, and is also suitable for coiled tubing of various specifications or straight tubes and bent tubes made of other materials.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (9)
1. An apparatus for in situ wall thickness measurement of coiled tubing, comprising:
the continuous oil pipe continuous-flow continuous;
the continuous oil pipe is arranged in the central hole of the sealing and pressurizing cover, the lower end of the sealing and pressurizing cover is provided with an inner groove of the sealing and pressurizing cover and an outer groove of the sealing and pressurizing cover, the inner groove of the sealing and pressurizing cover corresponds to the inner groove of the kettle body, the outer groove of the sealing and pressurizing cover corresponds to the outer groove of the kettle body, the outer groove wall of the outer groove of the sealing and pressurizing cover covers the outer wall of the kettle body and is in thread fit sealing, and the upper end of the sealing and pressurizing cover is provided with a connector for connecting an automatic screwing device;
the two ends of the rubber ring are respectively positioned in the inner groove of the kettle body and the inner groove of the sealing pressurizing cover, the rubber ring, the outer groove of the kettle body, the outer groove of the sealing pressurizing cover and the outer wall enclose a hydraulic cavity, and an ultrasonic probe of the ultrasonic detector is in contact with the rubber ring.
2. The device for detecting the wall thickness of the continuous oil pipe on site according to claim 1, wherein the rubber ring is in interference fit with the inner groove of the kettle body and the inner groove of the sealing and pressurizing cover.
3. The apparatus of claim 1, wherein the outer groove of the sealing gland is provided with an annular piston therein, and the bottom of the outer groove of the sealing gland is provided with a plurality of fixing rods for fixing the annular piston.
4. The apparatus of claim 1, wherein the ultrasonic probe is sealed in threaded engagement with the adjustment screw hole.
5. The device for on-site detection of the wall thickness of the continuous oil pipe according to claim 1, wherein the inner groove of the kettle body and the inner groove of the sealing and pressurizing cover are in an open conical shape.
6. The device for detecting the wall thickness of the continuous oil pipe on site as claimed in claim 1, wherein the width of the groove inside the kettle body is smaller than that of the groove outside the kettle body.
7. The device for on-site detection of the wall thickness of the continuous oil pipe according to claim 1, wherein a plurality of fixing screw holes are circumferentially distributed on the bottom wall of the kettle body for fixing the device, and each fixing screw hole is positioned on the outer side of the outer wall of the kettle body.
8. The device for detecting the wall thickness of the continuous oil pipe in site as claimed in claim 1, wherein the material of the rubber ring is wear-resistant rubber.
9. A method of in situ wall thickness measurement of a coiled tubing string, comprising:
s1, placing the rubber ring into a groove in the kettle body, installing the ultrasonic detector in place, filling liquid into the hydraulic cavity, and fixing the annular piston in the groove outside the sealing gland;
s2, aligning the sealing pressure cover with the rubber ring, screwing the sealing pressure cover, connecting the sealing pressure cover with the kettle body through screw thread, forming interference seal by the rubber ring, the inner groove of the sealing pressure cover and the inner groove of the axe body to form enough sealing pressure, forming seal for the sealing pressure cover and the kettle body, wherein the pressure in the hydraulic cavity is p, and the initial screwing torque is T0Then, in the hydraulic chamber sealing process, the total acting force on the sealing gland is as follows:
Fp＝App
in the formula, Ap-hydraulic chamber cross-sectional area; p-hydraulic chamber pressure; fp-the total force of the hydraulic chamber pressure on the sealing gland;
the additional thread-on torque generated by the force on the seal gland is calculated by the rotating shoulder fire equation:
wherein:
in the formula, P is the thread pitch of the sealing thread; mu.stCoefficient of friction of thread flanks α angle of thread flank bearing surface Rt-sealing thread friction torque equivalent force arm; e7-pitch diameter of the thread; g-length of incomplete thread; l is7-full thread length; t is ts-the taper of the thread in diameter;
s3, the sealing thread is buckled through the automatic buckling device, liquid is continuously pressurized, the rubber ring is deformed under the pressure action of the hydraulic chamber and then clings to the coiled tubing, and the relation between the total buckling torque and the pressure of the liquid chamber in the pressurizing process is as follows:
s4, enabling the ultrasonic sensor probes to cling to the outer wall of the rubber ring and emit ultrasonic waves according to set frequency and intensity, continuously measuring the time of the ultrasonic waves emitted by each probe reaching the interface of the rubber ring and the continuous oil pipe and the time of the ultrasonic waves transmitted by each probe in the continuous oil pipe, and obtaining monitoring images of the ultrasonic detectors after the time reaches the design time;
s5, analyzing the image, wherein the front section image can generate small amplitude and is very stable, and is a transmission image of sound waves in the rubber ring, when the sound waves are transmitted to the outside of the coiled tubing for the first timeIn the case of a wall, the image will have a large amplitude difference depending on the medium, and the time when the amplitude changes abruptly for the first time is defined as t0The sound wave is transmitted to the inner wall of the coiled tubing for reflection and then transmitted to the rubber ring along with the outer wall, the amplitude slowly tends to be stable, and the time when the amplitude tends to be stable is determined as t1At the moment, the sound wave is transmitted in the coiled tubing in one period;
the propagation velocity of sound in the coiled tubing is set as vsCalculating the wall thickness of the coiled tubing according to the following formula;
in the formula, d is the measured thickness of the coiled tubing; t is t0-initial time of propagation of the ultrasonic waves to the outer wall of the tubing; t is t1-end of ultrasonic propagation response time in the tubing; v. ofs-the speed of sound propagation in the tubing.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111595704A (en) * | 2020-05-22 | 2020-08-28 | 中国石油天然气集团有限公司 | Method for predicting fatigue life of continuous oil pipe |
| CN111664820A (en) * | 2020-06-09 | 2020-09-15 | 美钻能源科技(上海)有限公司 | Submarine manifold wall thickness monitoring device and monitoring method |
| CN113340495A (en) * | 2021-05-26 | 2021-09-03 | 武汉理工大学 | Torque measuring device and method based on optical fiber FP sensing |
| CN113406204A (en) * | 2021-06-25 | 2021-09-17 | 中国船舶重工集团公司第七一九研究所 | External pipeline damage detection system and detection method thereof |
| CN114034267A (en) * | 2021-09-30 | 2022-02-11 | 河北大学 | Multi-channel flow cross section detection device and detection method |
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| CN111595704B (en) * | 2020-05-22 | 2022-06-03 | 中国石油天然气集团有限公司 | Method for predicting fatigue life of continuous oil pipe |
| CN111664820A (en) * | 2020-06-09 | 2020-09-15 | 美钻能源科技(上海)有限公司 | Submarine manifold wall thickness monitoring device and monitoring method |
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| CN113406204A (en) * | 2021-06-25 | 2021-09-17 | 中国船舶重工集团公司第七一九研究所 | External pipeline damage detection system and detection method thereof |
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