CN109282768B - Gas hydrates pipeline blockage cross section profile detection method and the device for implementing this method - Google Patents
Gas hydrates pipeline blockage cross section profile detection method and the device for implementing this method Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 21
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- 238000009434 installation Methods 0.000 claims abstract description 3
- 238000005259 measurement Methods 0.000 claims description 25
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- 238000002604 ultrasonography Methods 0.000 abstract description 3
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- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 24
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- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
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Classifications
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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
- G01B17/06—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring contours or curvatures
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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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- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
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Abstract
Gas hydrates pipeline blockage cross section profile detection method and the device for implementing this method, belong to oil-gas pipeline fluid flowing field of security guarantee, for solving the problems, such as ultrasound examination gas hydrates pipeline blockage cross section profile, main points are pipeline outer circle lengthwise position installation sonic probes to be measured, its distance between pipeline to be measured is adjustable, in the initial position of pipeline outer circle to be measured, mobile sonic probe is to adjust the distance between sonic probe and sonic probe, and continuous acquisition is carried out to ultrasonic signal, to obtain the vertical range of probe transmitting terminal and tube wall when the focus of sonic probe reaches Hydrate Plugging location boundary, to Hydrate Plugging thickness in pipeline at the determination pipeline to be measured point, effect is to realize to determine at pipeline point to be measured Hydrate Plugging thickness in pipeline, so as to describe the hydrate profile in pipeline.
Description
Technical field
The invention belongs to oil-gas pipeline fluids to flow field of security guarantee, be related to a kind of gas hydrates pipeline blockage section
Facial contour detection method and the device for implementing this method.
Background technique
In pipe-line, line clogging can be caused because of the deposition of hydrate, wax etc., or because corrosive pipeline causes
Safety problem, to cause safety accident.Hydrate Plugging is found for the first time in natural-gas transfer pipeline from the former Soviet Union in 1934
Since, as the exploitation of petroleum resources is constantly expanded to deep water field, all kinds of safety problems caused by hydrate are further prominent,
Great economic loss is brought to petroleum industry.According to statistics, whole world whole year is up to 500,000,000 beauty for the expense of hydrate prevention and treatment
Member, wherein half is prevented for the generation of hydrate.Therefore, the research of the formation to hydrate in oil-gas pipeline and blocking process
It is particularly important.
Currently, the process study of the formation and flowing to hydrate in pipeline is essentially disclosed in the prior art, however
The blocking form of Hydrate Plugging in the duct, especially during line clogging the cross section profile of hydrate grind for prevention and
Removal hydrate is of great significance, thus, a kind of cross section profile can adapt to the hydrate during line clogging is provided
The device of detection is particularly important.
Ultrasonic technology is mainly used for the fields such as machine-building, engineering construction, petrochemical equipment, by signal transmitting, letter
Number receive and waveform show three part composition.The basic principle is that generating piezoelectric effect by ultrasonic probe to emit, receive
Ultrasonic wave.The core element of probe is laminar piezo-electric crystal, commonly referred to as piezoelectric chip.When high frequency electric pulse is applied to probe
When, high-frequency vibration occurs for excitation piezoelectric chip, generates ultrasonic wave, and circuit is received after reflection and is received, is acquired through oscillograph
Signal simultaneously exports reception waveform, thus, it is possible to measure sea bed gas hydrate pipeline blockage section using ultrasonic technology
Profile.
Summary of the invention
In order to solve the problems, such as ultrasound examination gas hydrates pipeline blockage cross section profile, the present invention proposes following skill
Art scheme:
A kind of gas hydrates pipeline blockage cross section profile detection method, pipeline outer circle lengthwise position to be measured install sound wave
Probe, distance is adjustable between pipeline to be measured, and in the initial position of pipeline outer circle to be measured, mobile sonic probe is to adjust sound wave spy
The distance between head and sonic probe, and continuous acquisition is carried out to ultrasonic signal, water is reached to obtain the focus of sonic probe
The vertical range of probe transmitting terminal and tube wall when closing object blocking position boundary, to be hydrated in pipeline at the determination pipeline to be measured point
Object blocks thickness.
Further, mobile sonic probe is in the position of outer circle, so that the circle of the pipeline to be measured where the initial position
Week is detected by sonic probe and obtains the Hydrate Plugging thickness in the corresponding pipeline of each measurement position in whole circumference, and synthesis is every
The Hydrate Plugging thickness of one position, obtains the contour curve in pipeline blockage section.
Further, the method for Hydrate Plugging thickness is as follows in signal piping:
The blocking thickness of gas hydrates in the corresponding pipeline in sonic probe position is calculated by formula (1):
R=D-R-s (1)
Wherein, r is pipe thickness, and R is the thickness of Hydrate Plugging, and D is acoustic wave transducer focal length, and s is sonic probe
The vertical range of sonic probe transmitting terminal and tube wall when focus reaches Hydrate Plugging location boundary.
Further, the acquisition methods of s are: the starting distance of a sonic probe and tube wall are limited, with the starting distance
Ultrasonic signal is emitted by sonic probe, and reflected sonic signals are acquired, changes sonic probe at a distance from tube wall, obtains more
Group reflected sonic signals, wherein with maximum amplitude reflected sonic signals corresponding to sonic probe be at a distance from tube wall
For s.
Further, focusing D makes amendment, and correction formula is as follows:
Wherein, D0The intrinsic focal length for indicating energy converter, is the build-in attribute of energy converter, VwaterIt is the propagation of sound wave in water
Speed, VmediumIt is spread speed of the sound wave in real medium.
Further, formula (2) is expressed as follows:
Wherein, Vpipe.Indicate the spread speed of sound wave in the pipe wall, VhydtateIt is biography of the sound wave in Hydrate Plugging object
Speed is broadcast, the thickness of tamper is calculated:
Further, docking receives signal waveform and carries out time-domain analysis, t1, t2And t3It respectively indicates outer pipeline, inner surface and blocks up
The sound wave for filling in interface reflects time of arrival (toa), and propagation time of the sound wave in gas hydrates indicates are as follows:
Δ t=t3-t2 (5)
VhydtateIt is spread speed of the sound wave in Hydrate Plugging object, r is indicated are as follows:
A kind of device for implementing gas hydrates pipeline blockage cross section profile detection method, including be detachably connected on
Two ring-shaped guide rails of pipe under test, the sliding block moved along ring-shaped guide rail, the balancing pole and pedestal for connecting two sliding blocks, the bottom
Seat is balanced bar and is fixed thereon, and is equipped with the sonic probe towards pipeline to be measured in pedestal.
Further, Position Scale is installed on the slide block, pedestal slides on Position Scale along the vertical direction, empty
Heart connecting rod top is fixedly connected with pedestal, and the bottom end of hollow connecting rod connects sonic probe.
Further, the Position Scale includes the support frame and knob fixed with pedestal, has scale on support frame
Scale, knob have screw thread, and knob is threadedly coupled the different height position that pedestal is fixed on to support frame.
The utility model has the advantages that the method for the invention realizes Hydrate Plugging thickness in pipeline at the determination pipeline to be measured point, from
And the hydrate profile in pipeline can be described.Since hydrate pipeline blockage distributing position and shape have uncertainty, think
It accurately to detect its position and profile, need to carry out complete detection, the present invention realizes comprehensive inspection of packaged type
It surveys, ultrasonic transmission device complete detection hydrate pipeline blockage cross section profile can be cooperated.
Detailed description of the invention:
Fig. 1 is the three dimensional structure diagram of apparatus of the present invention.
Fig. 2 is the scheme of installation of apparatus of the present invention guide rail and sliding block.
Fig. 3 is apparatus of the present invention side view.
Fig. 4 is that apparatus of the present invention are perspective views.
Fig. 5 is waveform diagram.
Fig. 6 is different sonic probes figure compared with tube wall is apart from lower reflected sonic signals.
Wherein: 1. ring-shaped guide rail, 2. fixing bolt, 3. 4. sliding block of pipeline to be measured, 5. through-hole, 6. balancing pole, 7. block
8. the hollow probe of connecting rod 14. of 11. knob of pedestal 9. distance controller, 10. sonic probe, 12. Position Scale 13. is fixed
Fixture
Specific embodiment:
A specific embodiment of the invention is described in detail below in conjunction with technical solution and attached drawing.The embodiment is for into one
The step description present invention, rather than limit the present invention.
As shown in figure 4, mobile contactless gas hydrates pipeline blockage cross section profile detection device, mainly includes quilt
Be detachably connected on two ring-shaped guide rails 1 of pipe under test, the sliding block 4 moved along ring-shaped guide rail 1, two sliding blocks 4 of connection it is flat
Weighing apparatus bar 6 and pedestal 8, the pedestal 8 are balanced bar 6 and are fixed thereon, and are equipped with the sound wave towards pipeline 3 to be measured in pedestal 8
Probe 10.Position Scale 12 is installed on the sliding block 4, pedestal 8 slides on Position Scale 12 along the vertical direction, hollow company
13 top of extension bar is fixedly connected with pedestal 8, and the bottom end of hollow connecting rod 13 connects sonic probe 10.The Position Scale 12 wraps
The support frame and knob 11 fixed with pedestal 8 are included, there is scale label on support frame, knob 11 has screw thread, and knob 11 is with spiral shell
Line connects the different height position that pedestal 8 is fixed on to support frame.The upper ring surface of the ring-shaped guide rail 1 is led for what sliding block 4 slided
Rail level.Guide-rail plate is extended to form from the upper ring surface of ring-shaped guide rail 1 to 3 direction of pipeline to be measured, the guide pass of guide-rail plate is sliding for sliding block 4
Row, the guide pass are two opposite medial surfaces of two guide-rail plates.The ring-shaped guide rail 1 is half circular track, is set on it
It is equipped with the fixing bolt 2 for being fixed in pipe under test.Block 7 is installed in the terminal of the half circular track.In
The sliding block 4 is sometime being fixed on guide rail with fitted bolt through through-hole 5 is outputed by the guide-rail plate of the ring-shaped guide rail 1
The a certain position of plate.The flag bit of several mark angular position informations is installed on ring-shaped guide rail 1, the flag bit is in annular
It is in uniformly or non-uniformly to be distributed on guide rail 1.
By above scheme, ring-shaped guide rail 1 provides fixed and positioning effect to measure, and respectively there is a fixation at the both ends of guide rail
Bolt 2 is fixed on guide rail on pipeline 3 to be measured by adjusting the precession position of two fixing bolts 2, and after fixed, guide rail will not
It moves, to guarantee accurate positionin when measurement.Sliding block 4 is connected on ring-shaped guide rail 1, can be along ring-shaped guide rail 1 to be measured
3 surrounding of pipeline is moved freely, and when being moved to measurement position, achievable manual fixation, starts to measure.In order to determine sliding block 4
Angle position, be provided with angle index on ring-shaped guide rail 1.Position Scale 12 is fixed on sliding block 4, and effect is adjustment base 8
The distance between pipeline 3 to be measured simultaneously measures simultaneously, and the method for adjusting is the knob 11 for twisting scale side.Pedestal 8 is solid
It is scheduled on scale, effect is connection sonic probe 10 and Position Scale 12, is obtained by mobile and measurement pedestal 8 position come indirect
To the position of sonic probe 10 so that sonic probe 10 can be adjusted at a distance from tube wall, the purpose of adjustment be for
A location information is found, that is, finds distance, under the distance, whether sonic probe focus reaches natural gas hydration
Object blocking position boundary, the i.e. amplitude and maximum intensity of reflected sonic signals.Hollow connecting rod 13 is connected on pedestal 8, for connecting
It connects sonic probe 10 and dredges the wiring of 10 tail portion of sonic probe.The front end of connecting rod is connected with stationary fixture, is used for sound wave
Probe 10 is fixed, and in measurement, can also easily replace to probe.
By above-mentioned, the present invention provides a kind of sea bed gas hydrate pipeline blockage cross section profile detection devices.It is adopted
It is open clamp block (i.e. ring-shaped guide rail 1) with Portable detachable, it is mountable to be located in any lengthwise position of 3 outer circle of pipeline to be measured.It adopts
Formula sonic probe is received with single-shot list, based on the difference of ultrasonic wave velocity of wave and propagation time in different media, by acoustical signal
Inversion Calculation determine at circumference every bit Hydrate Plugging thickness in pipeline.It controls sliding block 4 around pipeline movement, can detect
And it records in the pipe in 360 degree of circumference and blocks profile.The device, which compensates for the prior art, can not cooperate ultrasonic unit portable
The limitation of Hydrate Plugging cross section profile in pipeline is measured, and provides new detection and safety in advance for oil-gas pipeline safety transport
Anti- means.
The working principle of Hydrate Plugging cross section profile is in present apparatus ultrasonic unit measurement pipeline: sonic probe transmitting
Ultrasonic wave vertical incidence pipeline surface, since in most cases, the form of Hydrate Plugging object is presented close to interior in pipeline
The growth pattern of wall surface, therefore ultrasonic wave reaches tamper by that can be emitted directly toward in Hydrate Plugging object after pipeline inner wall
With natural gas is conveyed in pipeline gas-solid interface at reflect, reflection signal by original route is back to receiving end, receives
Signal handle can be obtained in complete communication process by analysis, propagation time and stroke of the sound wave in each phase medium,
Thus judge the thickness of the Hydrate Plugging object on the path that ultrasonic wave passes through.In this process, sound wave can be in pipeline
It is reflected on surface and the solid-solid contact face of Hydrate Plugging object, this reflection is usually very strong, and depends on hydrate
Contact tightness degree of the tamper with pipeline can generate greatly interference to signal is received, therefore, the prior art is used
Contact ultrasonic thickness measuring method cannot achieve the accurate judgement to echo signal.The movable type that the present invention uses is non-contact super
Acoustic measurement method breaches the limitation that original ultrasonic thickness measurement is analyzed only with waveform time domain, passes through amplitude analysis and time domain point
The method that phase separation combines, can more accurate lock onto target signal, and then calculate the Hydrate Plugging profile in pipeline.The dress
It sets and has broken original pipeline choke detecting method with method and be only capable of by pressure wave and ultrasonic wave in pipe propagating along transporting direction
Limitation, compensate for the prior art and be only capable of substantially judging the deficiency that blocking position can not determine chocking section profile.
As shown in Fig. 2, when being measured to pipeline blockage, first by two ring-shaped guide rails 1 by 2 sets of fixing bolt to
3 blocking position of test tube road.Pipeline 3 to be measured is set to be in two in parallel as far as possible by adjusting the twisting distance of two fixing bolts 2
At the geometric center of guide rail.The design of fixing bolt 2 herein can not be limited according to the demand of pipeline 3 to be measured by pipeline size.
Sliding block 4 on guide rail can be free to slide around pipeline 3 to be measured on guide rail, can when sliding block 4 slides into the position for needing to measure
The position of sliding block 4 is fixed with penetrating through-hole 5 with bolt, makes sonic probe 10 thick in the blocking for measuring a certain fixed position in this way
It, will not be because of the slight mobile interference caused to signal is received of sliding block 4 when spending.Through-hole 5 symmetrically and evenly be distributed in two rings
On shape guide rail 1, two sliding blocks 4 are connected by balancing pole 6, during being slided around pipeline, two sliding blocks 4 can ensure that it is synchronous and
It is vertical with guide rail, it can guarantee that sonic probe 10 can be directed at always the axle center of pipeline in this way, not deviate by.At the both ends of guide rail
It is each provided with a block 7, anti-limited slip block 4 is detached from guide rail.Entire sliding trace covers pipeline circumference 180 degree, completes one every time
A complete 360 degree of circumference measurement needs to dismantle once, can also be cooperated using two sets of equipment, be more advantageous to saving in this way
Time improves measurement efficiency.Several flag bits are provided between sliding starting point and terminal, these flag bits uniformly divide
Cloth.When sliding block 4 is moved to any position, corresponding angular position information can be obtained.Sonic probe 10 is by pedestal 8 and puts down
The bar 6 that weighs is connected, and receives the acoustical signal that probe receives thus according to single-shot list to judge the chocking section information in pipeline.
The uniform mobile to acoustical signal progress continuous acquisition of probe can be driven by pedestal 8, according to the big of probe focal length
The displacement distance scope of small setting pedestal 8.Using the sonic probe that 4.2 inches of frequencies are 5MHz is focused in example, it is arranged
Displacement distance scope is 4.2 inches, and initial position is related with pipeline wall thickness, to ensure the accuracy sampled, measures pedestal 8 every time
Probe is driven at least to move back and forth by starting point primary, after sampling, mobile sliding block 4 to next measurement point repeats previous step
Measurement, the measurement for completing whole circumference need to synthesize the metrical information of every bit, and 360 degree of profiles for drawing pipeline blockage section are bent
Line.Therefore, measurement point setting is more, and the blocking profile point of acquisition is more, and the profile for being fitted acquisition is more accurate.Theoretically without
Method measures the block information of the every bit of pipeline inner periphery infinitely, and measurement point position is more, and required time is longer, actual measurement time
Number needs to be comprehensively considered as the case may be.
The sea bed gas hydrate pipeline blockage cross section profile detection device of above scheme comprising sonic probe
10, mobile measurement pedestal 8 and annular removable rail, wherein the connection of sonic probe 10 measurement pedestal 8, is given in real time by flag bit
Out measurement position, the distance between probe and pipeline provided by Position Scale 12；Pedestal 8 by Position Scale 12 indirectly with sliding block 4
It is connected with each other and sliding block 4 is mobile, sliding block 4 is mounted on ring-shaped guide rail 1, finally ring-shaped guide rail 1 is fixed on pipeline to be measured.
In addition, sliding block 4 can be rotated along ring-shaped guide rail 1 around pipeline 3 to be measured, by adjusting guide rail fixation position, it can be achieved that in pipeline
360 degree of detections measure and record pipeline 3 to be measured while mobile around pipeline and block profile calibration curve information.
The detection device can simply and easily be mounted on any position of pipeline longitudinal direction to be measured.Without external pipeline, energy
The rapid survey chocking section profile in the case where not destroying pipeline structure.Portable device construction, semicircular slideway are set
Fast quick-detach can be achieved in meter.Convenient for the processing and connection synthesis of contour curve data, complete to the complete of steel pipe cross section to be measured
Whole profile measurement.The device can ignore the operating condition in pipeline, such as condition of high voltage, can realize chocking section under pipeline working condition
The measurement of profile.
As further embodiment, present apparatus assembling and measuring process are as follows:
Two ring-shaped guide rails 1 are first passed through 2 sets of fixing bolt in 3 blocking position of pipeline to be measured by the first step.By adjusting two
The twisting distance of a fixing bolt 2 is in pipeline 3 to be measured at the geometric center of two closed slides.
Sliding block 4, is moved to the starting point of ring-shaped guide rail 1 by second step, and two sliding blocks 4 should ensure that consistency from top to bottom, in this way can be with
Guarantee that sonic probe 10 can be directed at always the axle center of pipeline, does not deviate by.
Third step penetrates through-hole 5 with bolt and fixes the position of sliding block 4, not make sonic probe 10 a certain solid in measurement
When positioning the blocking thickness set, slight movement occurs and causes the interference to signal is received.After fixation, corresponding angle position is recorded
Confidence breath
4th step, distance of the adjustment probe away from pipe outer wall, by this present embodiment using the ultrasound for focusing 4.2 inches
Wave probe 10, therefore it is 4.2 inches that first adjustment, which is popped one's head in away from pipe outer wall distance, and in this, as the initial position measured every time.
5th step connects acoustic wave transducer, the wiring of sonic generator and oscillograph.Sonic probe in the present invention includes
Sonic generator and acoustic wave transducer, sound wave are ultrasonic wave.
6th step starts to measure, and opens acoustic wave transducer switch, and the waveform in observation oscilloscope reflects most strong letter at this time
It number should be from the reflection of pipe outer wall.Gradually to the mobile sonic probe in direction close to pipeline 3 to be measured, at the same record it is mobile away from
From and observe waveform situation of change.The primary rear position that can determine echo signal is moved back and forth, the location information is accurately recorded.
Sliding block 4 is moved to next measurement point of ring-shaped guide rail 1 and repeats step 3 to step 6 by the 7th step.
8th step, after location information is calculated, the blocking profile of the every bit measured, connecting these points can
Draw 360 degree of contour curves in pipeline blockage section.Measurement point is arranged more, and the blocking profile point of acquisition is more, draws
Blocking profile it is more accurate.The block information of the every bit of pipeline inner periphery can not be theoretically measured infinitely, and measurement point position is got over
More, required time is longer, and actual measurement number needs to be comprehensively considered as the case may be.
For in the 8th step, it is as follows to blocking THICKNESS CALCULATION method that method is combined with time-domain analysis using amplitude analysis:
Amplitude analysis method: focusing probe, which has, increases the function of strong reflectance signal in focal point, when sonic probe 10 is in movement
To adjust it with tube wall during distance, hence it is evident that when discovery reflection signal amplitude enhancing, the calculating side of formula (1) can be passed through
Method obtains the blocking thickness at this:
R=D-R-s (1)
Wherein, r is pipe thickness, and R is the thickness of Hydrate Plugging, and D is acoustic wave transducer focal length, and s is sonic probe
The vertical range of probe transmitting terminal and tube wall when focus reaches Hydrate Plugging location boundary.
Wherein, as shown in fig. 6, the acquisition methods of s are: limiting the starting distance of a sonic probe and tube wall, risen with this
Beginning distance emits ultrasonic signal by sonic probe, and acquires to reflected sonic signals；Change sonic probe at a distance from tube wall,
And obtain multiple groups reflected sonic signals, wherein sonic probe and tube wall corresponding to the reflected sonic signals with maximum amplitude
Distance, the focus as popped one's head in reaches the distance of Hydrate Plugging location boundary, emits ultrasonic wave apart from sonic probe herein
Signal, then the maximum intensity of reflected sonic signals, s are the distance.
Consider during the test, speed of the sound wave in the different propagation mediums such as water, the outer wall of pipeline and hydrate
Degree is different, and focal length D will be with moving and changing for probe.So focusing D is needed to make amendment, correction formula
It is as follows:
Wherein, D0The intrinsic focal length for indicating energy converter, is the build-in attribute of energy converter, VwaterIt is the propagation of sound wave in water
Speed, VmediumIt is spread speed of the sound wave in real medium.And for this experiment, formula (2) can be expressed as follows:
Wherein, VpipeIndicate the spread speed of sound wave in the pipe wall, VhydtateIt is propagation of the sound wave in Hydrate Plugging object
Speed, they are all known, so can be according to the thickness that tamper is calculated:
Time Domain Analysis: but can not be directly calculated by mobile amplitude analysis method in many cases, stifled
Plug thickness, such as tube wall face thickness are excessive, to dock receive signal waveform progress time-domain analysis at this time.Waveform diagram such as Fig. 5, t1, t2With
t3Pipeline outer, inner surface and the reflection arrival time for blocking interface are respectively indicated, therefore, when propagation of the sound wave in hydrate
Between may be expressed as:
Δ t=t3-t2 (5)
Work as VhydrateIt is known that then r may be expressed as:
The preferable specific embodiment of the above, only the invention, but the protection scope of the invention is not
It is confined to this, anyone skilled in the art is in the technical scope that the invention discloses, according to the present invention
The technical solution of creation and its inventive concept are subject to equivalent substitution or change, should all cover the invention protection scope it
It is interior.
Claims (6)
1. a kind of gas hydrates pipeline blockage cross section profile detection method, which is characterized in that pipeline outer circle to be measured longitudinal direction position
Set installation sonic probe, distance is adjustable between pipeline to be measured, in the initial position of pipeline outer circle to be measured, mobile sonic probe with
The distance between sonic probe and sonic probe are adjusted, and continuous acquisition is carried out to ultrasonic signal, to obtain sonic probe
The vertical range of probe transmitting terminal and tube wall when focus reaches Hydrate Plugging location boundary, at the determination pipeline to be measured point
Hydrate Plugging thickness in pipeline；
The method of Hydrate Plugging thickness is as follows in signal piping:
The blocking thickness of gas hydrates in the corresponding pipeline in sonic probe position is calculated by formula (1):
R=D-R-s (1)
Wherein, r is pipe thickness, and R is the thickness of Hydrate Plugging, and D is acoustic wave transducer focal length, and s is the focus of sonic probe
The vertical range of sonic probe transmitting terminal and tube wall when reaching Hydrate Plugging location boundary.
2. gas hydrates pipeline blockage cross section profile detection method as described in claim 1, which is characterized in that mobile sound
Wave is popped one's head in the position of outer circle, so that the circumference of the pipeline to be measured where the initial position is detected and obtained whole by sonic probe
Hydrate Plugging thickness on a circumference in the corresponding pipeline of each measurement position, synthesizes the Hydrate Plugging thickness of each position,
Obtain the contour curve in pipeline blockage section.
3. gas hydrates pipeline blockage cross section profile detection method as described in claim 1, which is characterized in that s's obtains
Taking method is: the starting distance of a sonic probe and tube wall is limited, with the starting distance by sonic probe transmitting ultrasonic wave letter
Number, and reflected sonic signals are acquired, change sonic probe at a distance from tube wall, obtain multiple groups reflected sonic signals, wherein tool
Having sonic probe corresponding to the reflected sonic signals of maximum amplitude is s at a distance from tube wall.
4. gas hydrates pipeline blockage cross section profile detection method as described in claim 1, which is characterized in that focusing
D makes amendment, and correction formula is as follows:
Wherein, D0The intrinsic focal length for indicating energy converter, is the build-in attribute of energy converter, VwaterIt is the propagation speed of sound wave in water
Degree, VmediumIt is spread speed of the sound wave in real medium.
5. gas hydrates pipeline blockage cross section profile detection method as claimed in claim 4, which is characterized in that
Formula (2) is expressed as follows:
Wherein, VpipeIndicate the spread speed of sound wave in the pipe wall, VhydtateIt is propagation speed of the sound wave in Hydrate Plugging object
Degree, is calculated the thickness of tamper:
6. gas hydrates pipeline blockage cross section profile detection method as described in claim 1, which is characterized in that reception
Signal waveform carries out time-domain analysis, t1, t2And t3Respectively indicate outer pipeline, inner surface and the sound wave reflection signal for blocking interface
Arrival time, propagation time of the sound wave in gas hydrates indicate are as follows:
Δ t=t3-t2 (5)
VhydtateIt is spread speed of the sound wave in Hydrate Plugging object, r is indicated are as follows:
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