CN109654990B

CN109654990B - Continuous oil pipe wall thickness online measurement probe based on pulse ACFM

Info

Publication number: CN109654990B
Application number: CN201910018078.9A
Authority: CN
Inventors: 李伟; 赵建明; 葛玖浩; 袁新安; 朱玉凯
Original assignee: China University of Petroleum East China
Current assignee: China University of Petroleum East China
Priority date: 2019-01-09
Filing date: 2019-01-09
Publication date: 2021-03-19
Anticipated expiration: 2039-01-09
Also published as: CN109654990A

Abstract

The invention provides a continuous oil pipe wall thickness online measuring probe based on pulse ACFM, which comprises a continuous oil pipe, a trolley, a detection probe, a spring, a connecting device and a fixing device. The detection probe is arranged in a groove of the trolley, the lifting distance between the detection probe and the coiled tubing is reduced to the maximum extent, the measurement effect is improved, the trolley is in contact with the coiled tubing in work through wheels, the abrasion of the probe is avoided, the spring is tightly pressed on the detection probe, the constant lifting distance between the detection probe and the coiled tubing is ensured, the problem that the conventional fixed electromagnetic detection probe is inaccurate in measurement data is solved, a plurality of detection probes are uniformly distributed on the coiled tubing, the wall thickness reduction condition of the whole oil pipe is reflected through scanning once, the detection efficiency is high, the detection probe comprises an excitation coil, a magnetic core and a magnetic field sensor, a pulse signal is loaded in the excitation coil, the wall thickness is measured according to the difference of magnetic field attenuation on the oil pipe, the measurement process is simple, the precision is high, and a coupling agent is not needed.

Description

Continuous oil pipe wall thickness online measurement probe based on pulse ACFM

Technical Field

The invention relates to the field of detection probes, in particular to a continuous oil pipe wall thickness online measurement probe based on pulse ACFM.

Background

The usage amount of the coiled tubing is increased rapidly along with the exploitation of shale gas in recent years, and online monitoring and detection are particularly important in order to ensure the safety in the use process; the use working condition of the continuous oil pipe is complex, and the wall thickness of the continuous oil pipe is easy to reduce due to mechanical abrasion and corrosion; the wall thickness of the coiled tubing needs to be measured online, so that large loss caused by failure of the tubing is avoided.

The conventional fixed electromagnetic detection probe is difficult to accurately measure the wall thickness of the coiled tubing and is easy to cause the abrasion of the probe because the ovality of the coiled tubing is changed due to poor using working conditions of the coiled tubing, and the lift-off and the simultaneous change of the wall thickness in the wall thickness measuring process are caused.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to apply the pulse alternating current electromagnetic field detection technology (ACFM) to the online measurement of the wall thickness of the coiled tubing, induce a uniform electric field on the coiled tubing by means of a U-shaped magnetic core, and pick up magnetic field signals in the space by using a magnetic field sensor to further calculate the wall thickness of the coiled tubing, wherein the measurement process is simple and does not need coupling; aiming at the defects that the change of the ovality of the coiled tubing affects the wall thickness measurement precision and the wear detection probe, the conventional fixed probe is changed into a follow-up probe, the lifting distance between the detection probe and the coiled tubing to be detected is ensured to be unchanged, the wear of the coiled tubing on the detection probe is avoided, and the online accurate measurement of the wall thickness of the coiled tubing is realized; a plurality of detection probes are uniformly distributed on the periphery of the coiled tubing, and because the wall thickness reduction is area corrosion generally, the wall thickness reduction condition of one circle of the whole coiled tubing is reflected by one-time scanning.

The embodiment of the application provides a continuous oil pipe wall thickness online measuring probe based on pulse ACFM, which comprises a continuous oil pipe, a trolley, a detecting probe and a spring; the utility model discloses a coiled tubing circumference, including coiled tubing, detection probe, magnetic field sensor, excitation coil, U type magnetic core, detection probe includes exciting coil, U type magnetic core and magnetic field sensor, the winding of detection coil is in on the U type magnetic core, magnetic field sensor installs the intermediate position of U type magnetic core below, lead to periodic pulse signal in the exciting coil, the detection probe pedestal mounting be in the recess of dolly, the dolly pass through the wheel with coiled tubing contacts, the spring compresses tightly on the detection probe.

Further, the trolley comprises a trolley frame, a fixing nut and wheels; the detection device comprises a trolley, a probe, a bearing, a fixing nut and a detection probe, wherein the probe is arranged in a groove of the trolley, the trolley is in contact with the coiled tubing through four wheels, the wheel is internally provided with the bearing, a shaft of the wheel is arranged in an installation hole of the trolley frame, the wheel is fixed on the trolley frame through the fastening of the fixing nut, a bulge on the detection probe is arranged in the groove of the trolley frame, the detection probe is connected with the trolley together, and the middle position of the trolley frame is free of materials.

Further, the detection probe comprises a probe shell, an exciting coil, a magnetic core, a magnetic field sensor and a probe cover; the groove on the probe shell is used for storing the exciting coil which is wound on the magnetic core and protrudes out, the protrusion on the probe shell is used for fixing the magnetic core, the groove on the probe shell is used for installing the sensor, the central line of the groove is coincident with the central line of the length of the detection probe, the groove on the probe shell is used for installing the protrusion on the probe cover, the fixing shaft on the probe shell is used for installing the compression spring and used for fixing the position of the spring, and the hole on the probe shell is used for passing through the exciting coil and a signal wire of the sensor.

The detection probe is characterized by further comprising a connecting device and fixing devices, wherein the fixing devices are arranged outside the springs, the fixing devices are M parts, the detection probe is installed in a groove of the fixing devices, the length of the groove is consistent with that of the detection probe, the width of the groove is half of that of the detection probe, the two fixing devices are fixed together, and the detection probe is installed inside the fixing devices; bosses are arranged at two ends of each fixing device, holes are formed in the bosses, the connecting device comprises nuts and bolts, and the connecting device connects the fixing devices together through the bosses of the fixing devices.

Further, both N and M are natural numbers greater than 1.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is an assembly schematic diagram of a continuous oil pipe wall thickness on-line measuring probe in the embodiment of the present application

FIG. 2 is an exploded view of an on-line measuring probe for the wall thickness of a coiled tubing in an embodiment of the present application

FIG. 3 is a trolley structure diagram of the online wall thickness measuring probe of the coiled tubing in the embodiment of the present application

FIG. 4 is an exploded view of the probe for measuring the wall thickness of coiled tubing in the embodiment of the present application

FIG. 5 is a structural diagram of a shell of a detection probe of the online wall thickness measurement probe of the coiled tubing according to the embodiment of the present application

FIG. 6 is an assembly drawing of the probe and the trolley for the on-line measuring probe of the wall thickness of the coiled tubing in the embodiment of the present application

FIG. 7 is an assembly view of the fixture and the inspection probe of the on-line measuring probe for the wall thickness of coiled tubing according to the embodiment of the present application

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment of the application provides a continuous oil pipe wall thickness online measuring probe based on pulse ACFM. As shown in fig. 1 and 2, the detection probes are installed at intervals of 90 ° in the circumferential direction of the coiled tubing, so that the wall thickness of 4 positions of the coiled tubing can be measured simultaneously, the reduction of the wall thickness is generally area corrosion, the diameter of the coiled tubing is small, and the 4 detection probes can detect the wall thickness reduction condition of the whole coiled tubing; the utility model discloses a coiled tubing detection device, including coiled tubing, inspection probe base, spring, fixing device, detection probe, wheel, coiled tubing, detection probe base, the detection probe base is installed in the recess of dolly, the dolly pass through the wheel with the coiled tubing contact has solved because the change of coiled tubing ovality wears out the problem of detection probe, the spring compresses tightly on the detection probe, makes the distance of lifting away between detection probe and the coiled tubing is unchangeable, has solved conventional fixed electromagnetic detection probe and has been difficult to accurately measure the not enough of coiled tubing wall thickness, the outside of spring is fixing device, fixing device is 4 parts, the dismantlement of whole device of being convenient for.

Further, as shown in fig. 3, the trolley comprises a trolley frame 201, a fixing nut 202 and wheels 203; the probe 30 is arranged in a groove of the trolley 20, so that the detection probe and the coiled tubing 10 can keep a fixed lifting distance, and the detection probe 30 is prevented from being worn by the coiled tubing 10; the trolley 20 is in contact with the coiled tubing 10 through four wheels 203, bearings are arranged in the wheels 203, the shafts of the wheels 203 are installed in installation holes of the trolley frame 201 along with the rolling of the coiled tubing 10, and the wheels 203 are fixed on the trolley frame 201 through fastening nuts 202; the bulge on the detection probe 30 is arranged in the groove of the trolley frame 201, so that the detection probe 30 is connected with the trolley 20, no material is arranged in the middle of the trolley frame 201, the detection probe 30 is arranged, the lifting distance between the detection probe 30 and the coiled tubing 10 is reduced to the maximum extent, and the wall thickness detection precision is improved.

Further, as shown in fig. 4 to 6, the detection probe 30 includes a probe housing 301, an exciting coil 302, a magnetic core 303, a sensor 304, a probe cover 305; the exciting coil 302 is wound on the magnetic core 303, a pulse signal is fed into the exciting coil, a uniform electric field is excited on the coiled tubing in the middle of the magnetic core 303, the excited electric field can be attenuated continuously along with the depth, the attenuation rules of different wall thicknesses are different, different current signals can generate different magnetic field signals in space, the measurement of the wall thickness of the coiled tubing 10 is realized through the change of the magnetic field picked up by the sensor 304, the measurement principle is simple, and no coupling agent is needed; the groove 3012 on the probe shell 301 is used for storing the coil of the exciting coil 302 wound on the protrusion of the magnetic core 303, and the protrusion 3013 on the probe shell 301 is used for fixing the magnetic core 303, so that the magnetic core 303 is prevented from shaking and the detection precision is prevented from being influenced; a recess 3014 in the probe housing 301 is used to mount the sensing transducer 304, the centerline of the recess 3014 coincides with the centerline of the length of the sensing probe 30, a recess 3015 in the probe housing 301 is used to mount a boss 3052 on the probe cover 305, a fixed shaft 3016 on the probe housing 301 is used to mount the hold down spring 40 for fixing the position of the spring 40, and a hole 3017 in the probe housing 301 is used to pass the signal lines of the excitation coil 302 and the sensing transducer 304.

Further, as shown in fig. 7, the detecting probe 30 is installed in a groove 6011 of the fixing device 60, the length of the groove 6011 is the same as the length of the detecting probe 30, the width of the groove 6011 is half of the width of the detecting probe 30, the two fixing devices 60 are connected together, and the detecting probe 30 is installed therein; bosses are arranged at two ends of each fixing device, and holes 6012 are formed in the bosses; the attachment device 50 includes a nut 501 and bolt 502, and a hole 6012 in the boss of the attachment device 50 mounts the fixtures together.

Compared with the prior art, the technical scheme provided by the embodiment of the application has the beneficial technical effects that:

(1) the thickness measuring method is simple, does not need a coupling agent, and can realize the online high-speed measurement of the continuous oil pipe;

(2) the conventional fixed probe is changed into a follow-up probe, so that the problem that the wall thickness cannot be accurately measured due to the change of lift-off in the fixed probe electromagnetic detection method is solved;

(3) through the rolling contact of the wheels and the coiled tubing, the defects of abrasion detection probes of the coiled tubing due to the change of ovality are overcome.

(4) A plurality of detection probes are uniformly distributed on the periphery of the coiled tubing, and the condition that the wall thickness of the whole coiled tubing is reduced can be detected by scanning once.

Claims

1. A continuous oil pipe wall thickness online measuring probe based on pulse ACFM is characterized by comprising a continuous oil pipe (10), a trolley (20), a detecting probe (30) and a spring (40); n detection probes (30) are uniformly distributed on the periphery of the coiled tubing (10), and each detection probe (30) comprises a probe shell (301), an exciting coil (302), a U-shaped magnetic core (303), a magnetic field sensor (304) and a probe cover (305); the exciting coil (302) is wound on the U-shaped magnetic core (303), the groove on the probe shell (301) is used for storing the exciting coil (302) which is wound on the magnetic core (303) and protrudes, the bulge on the probe shell (301) is used for fixing the magnetic core (303), the magnetic field sensor (304) is arranged at the middle position below the U-shaped magnetic core (303), a recess on the probe housing (301) for mounting the magnetic field sensor (304), the center line of the groove is coincident with the center line of the length of the detection probe, the groove on the probe shell (301) is used for installing the bulge on the probe cover (305), the fixed shaft on the probe shell (301) is used for installing the spring (40) and used for fixing the position of the spring (40), the hole on the probe shell (301) is used for passing through the signal wire of the exciting coil (302) and the magnetic field sensor (304); a periodic pulse signal is introduced into the exciting coil (302), the base of the detection probe (30) is arranged in a groove of the trolley (20), and the spring (40) is pressed on the detection probe (30);

the trolley comprises a trolley frame, a fixing nut and wheels; the probe is arranged in a groove of the trolley, the trolley is in contact with the coiled tubing through four wheels, bearings are arranged in the wheels, shafts of the wheels are arranged in mounting holes of the trolley frame and are fastened through the fixing nuts, the wheels are fixed on the trolley frame, and a protrusion on the detection probe is arranged in the groove of the trolley frame, so that the detection probe and the trolley are connected together;

the detection device is characterized by further comprising a connecting device and fixing devices, wherein the fixing devices are arranged outside the springs, the fixing devices are M parts, the detection probes are installed in grooves of the fixing devices, the length of each groove is identical to that of each detection probe, the width of each groove is half of that of each detection probe, the two fixing devices are fixed together, and the detection probes are installed inside the fixing devices; bosses are arranged at two ends of each fixing device, holes are formed in the bosses, the connecting device comprises a nut and a bolt, and the connecting device connects the fixing devices together through the bosses of the fixing devices;

and both N and M are natural numbers larger than 1.