阅读说明：本技术 一种长输管道清管器跟踪定位装置 (Tracking and positioning device for pipe cleaner of long-distance pipeline ) 是由 张洪奎 祝颖 李国相 周莹 苟武侯 于 2019-10-11 设计创作，主要内容包括：本发明公开了一种长输管道清管器跟踪定位装置,包括在地面下铺设的油气输送管道,油气输送管道中游走有清管器,清管器在游走的过程中触碰到管道焊接口及突出物时产生振动,在地面下,同沟平行于油气输送管道敷设有光纤传感器,光纤传感器感应所述清管器产生的振动,传感器连接油气管道清管器跟踪系统,本发明根据清管器在清管过程中产生的较大振动,经过分布式光纤传感器采集、传输至光纤油气管道清管器跟踪系统,经过信号预处理,将振动特征信号上传至软件客户端,可对长输管道内清管器的实时位置进行跟踪,并实现准确定位。(The invention discloses a tracking and positioning device for a pipe cleaner of a long-distance pipeline, which comprises an oil-gas conveying pipeline laid under the ground, wherein a pipe cleaner walks in the oil-gas conveying pipeline, the pipe cleaner vibrates when contacting a pipeline welding port and a protrusion in the walking process, an optical fiber sensor is laid under the ground and is parallel to the oil-gas conveying pipeline in the same ditch, the optical fiber sensor senses the vibration generated by the pipe cleaner, and the sensor is connected with a tracking system of the pipe cleaner of the oil-gas pipeline.)

1. A tracking and positioning device for a pipe cleaner of a long-distance pipeline comprises an oil-gas conveying pipeline laid under the ground, the pipe cleaner walks in the oil-gas conveying pipeline, the pipe cleaner vibrates when touching a pipeline welding port and a protrusion in the walking process, it is characterized in that an optical fiber sensor is laid under the ground in parallel with the oil gas conveying pipeline in the same ditch, the optical fiber sensor senses the vibration generated by the pipe cleaner, the sensor is connected with a pipe cleaner tracking system of the oil gas pipeline, the oil and gas pipeline cleaner tracking system comprises a narrow line width laser, a 99:1 coupler, an optical modulator, an optical amplifier and a circulator which are sequentially connected in series, wherein the circulator is connected with the optical fiber sensor, the circulator is simultaneously connected with a 50:50 coupler, a photoelectric detector, an acquisition card and a preprocessor are sequentially connected behind the 50:50 coupler, and the preprocessor is connected with a monitoring client; scattered light with the changed refractive index in the optical fiber sensor is subjected to coherent interference in a 50:50 coupler through a circulator and 1% of local light of a 99:1 coupler, then interference signals are detected through an optical detector, interference signals are collected by a collecting card to serve as vibration signals, and vibration signal preprocessing is carried out through a preprocessor to find out the position of the oil and gas conveying pipeline where the pipeline cleaner vibrates.

2. The long pipeline pig tracking and positioning device of claim 1, wherein the fiber optic sensor is a distributed fiber optic sensor.

3. The long distance pipeline pig tracking and positioning device as claimed in claim 1 or 2, wherein the optical fiber sensor is laid in the same trench as the oil and gas transmission pipeline, is located within 15 cm from the oil and gas transmission pipeline, and is filled with soil.

4. The long pipeline pig tracking and positioning device of claim 1, wherein the optical fiber length of the optical fiber sensor is equal to or greater than the length of the oil and gas transmission pipeline, the segments are uniformly arranged in the oil and gas pipeline pig tracking system for the optical fiber length of the optical fiber sensor and provided with continuous segment numbers, and the position in the oil and gas transmission pipeline where the pig vibrates is found through a formula

wherein:

s represents the positioning position of the pipe cleaner from the initial monitoring end of the oil and gas transmission pipeline, and the unit is m;

z represents a section number of a position corresponding to the V-shaped tip of the pig vibration signal;

z_uindicating the positioning resolution in m/segment.

5. The device for tracking and positioning the long-distance pipeline pig according to claim 1, wherein a raman amplifier is arranged between the circulator and the optical fiber sensor, the raman amplifier further amplifies the narrow pulse detection light modulated by the optical modulator amplified by the optical amplifier and sends the amplified narrow pulse detection light to the optical fiber sensor, and meanwhile, the raman amplifier amplifies scattered light with changed refractive index and sends the amplified scattered light to the acquisition card through the circulator and the optical detector.

Technical Field

The invention relates to a tracking and positioning device for a long-distance pipeline cleaner.

Background

The cleaning operation of the traditional long-distance pipeline is the cleaning process of the inner wall of the pipeline under the pushing of a medium in the pipeline by adopting a pipeline cleaner, the positioning and monitoring work of the pipeline cleaner mainly comprises the steps of calculating the approximate position of the pipeline cleaner according to the ascending and downloading amount of a conveying medium, and meanwhile, the position of the pipeline cleaner is confirmed by matching a pipeline tracing person along the pipeline to hold a handheld pipeline cleaner tracking device. The method has poor positioning precision and high labor cost, and meanwhile, the position of the pipe cleaner cannot be accurately judged after the pipe cleaner fails.

Disclosure of Invention

The invention aims to provide a long-distance pipeline pig tracking and positioning device, which is a phi-OTDR technology-based long-distance pipeline pig real-time tracking and positioning system, and is used for transmitting a high-coherence narrow-linewidth pulse detection optical signal into a distributed optical fiber laid in the same groove with a long-distance pipeline, receiving a backward Rayleigh scattering optical signal, and measuring phase information of the signal to determine the position of a pig.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a tracking and positioning device for a pipe cleaner of a long-distance pipeline comprises an oil-gas conveying pipeline laid under the ground, wherein the pipe cleaner walks in the oil-gas conveying pipeline, and the pipe cleaner vibrates when contacting a pipeline welding port and a protrusion in the walking process, wherein an optical fiber sensor is laid under the ground in parallel to the oil-gas conveying pipeline in the same ditch, the optical fiber sensor senses the vibration generated by the pipe cleaner and is connected with an oil-gas pipeline pipe cleaner tracking system, the oil-gas pipeline pipe cleaner tracking system comprises a narrow-line-width laser, a 99:1 coupler, an optical modulator, an optical amplifier and a circulator which are sequentially connected in series, the circulator is connected with the optical fiber sensor, the circulator is simultaneously connected with a 50:50 coupler, a photoelectric detector, an acquisition card and a preprocessor are sequentially connected behind the 50:50 coupler, and the preprocessor is connected with a monitoring; scattered light with the changed refractive index in the optical fiber sensor is subjected to coherent interference in a 50:50 coupler through a circulator and 1% of local light of a 99:1 coupler, then interference signals are detected through an optical detector, interference signals are collected by a collecting card to serve as vibration signals, and vibration signal preprocessing is carried out through a preprocessor to find out the position of the oil and gas conveying pipeline where the pipeline cleaner vibrates.

The scheme is further as follows: the fibre-optic sensor is a distributed fibre-optic sensor.

The scheme is further as follows: the optical fiber sensor and the oil and gas transmission pipeline are laid in the same ditch and located within 15 cm of the oil and gas transmission pipeline, and soil is filled between the optical fiber sensor and the oil and gas transmission pipeline.

The scheme is further as follows: the optical fiber length of the optical fiber sensor is equal to or greater than the length of the oil and gas transmission pipeline, the sections are uniformly arranged in the oil and gas pipeline cleaner tracking system aiming at the optical fiber length of the optical fiber sensor, the number of the continuous sections is set, and the position of the oil and gas transmission pipeline where the cleaner vibrates is found out through a formula

The acquisition step is carried out by the user,

wherein:

s represents the positioning position of the pipe cleaner from the initial monitoring end of the oil and gas transmission pipeline, and the unit is m;

z represents a section number of a position corresponding to the V-shaped tip of the pig vibration signal;

z_uindicating the positioning resolution in m/segment.

The scheme is further as follows: a Raman amplifier is arranged between the circulator and the optical fiber sensor, the Raman amplifier further amplifies the narrow pulse detection light modulated by the optical modulator amplified by the optical amplifier and sends the amplified narrow pulse detection light to the optical fiber sensor, and meanwhile, the Raman amplifier amplifies scattered light with changed refractive index and sends the amplified scattered light to the acquisition card through the circulator and the optical detector.

According to the invention, according to the larger vibration generated in the pipe cleaning process of the pipe cleaner, the vibration is collected and transmitted to the pipe cleaner tracking system of the optical fiber oil and gas pipeline through the distributed optical fiber sensor, and the vibration characteristic signal is uploaded to the software client through signal preprocessing, so that the real-time position of the pipe cleaner in the long-distance pipeline can be tracked, and accurate positioning is realized.

The invention is described in detail below with reference to the figures and examples.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic diagram of a cable positioning and testing system according to the present invention;

figure 3 schematic representation of the characteristic vibration signal of the pig after pretreatment.

Detailed Description

A long-distance pipeline cleaner tracking and positioning device is shown in figures 1 and 2 and comprises an oil-gas conveying pipeline 1 laid under the ground, a pipeline cleaner 2 walks in the oil-gas conveying pipeline, the pipeline cleaner is placed in the pipeline when the pipeline is cleaned, the pipeline cleaner vibrates when touching a pipeline welding port 101, a welding line and a projection in the walking process, wherein an optical fiber sensor 3 is laid in the same ditch with the oil-gas conveying pipeline under the ground and is parallel to the oil-gas conveying pipeline, the optical fiber sensor adopts a distributed optical fiber sensor, the optical fiber sensor and the oil-gas conveying pipeline are laid in the same ditch and are located within 15 cm of the oil-gas conveying pipeline, the optical fiber sensor can be laid on the side surface of the oil-gas conveying pipeline, and the vibration is more sensitive on the oil-gas conveying pipeline, therefore, the optical fiber sensor is laid within 15 cm above the oil and gas conveying pipeline, the optical fiber sensor senses vibration generated by the pipe cleaner, and sensitivity is reduced due to a gap between the optical fiber sensor and the oil and gas conveying pipeline. Therefore, the space between the optical fiber sensor and the oil and gas transmission pipeline should be filled with medium (such as backfilled soil). The optical fiber sensor is connected with an oil-gas pipeline cleaner tracking system 4, the oil-gas pipeline cleaner tracking system is connected with a monitoring client 5, the oil-gas pipeline cleaner tracking system is connected with the optical fiber sensor 3 through an optical fiber interface, emits a narrow-linewidth pulse detection optical signal to the optical fiber sensor 3, receives a backward Rayleigh scattering optical signal in the optical fiber sensor 3, and mutually interferes the backward Rayleigh scattering optical signal within the pulse width of the backward Rayleigh scattering optical signal, so that the phase change of the backward scattering optical signal in the optical fiber is detected, and the detection of a weak vibration signal is realized; the oil and gas pipeline cleaner tracking system is installed in a relay station control room or a valve room of a long-distance pipeline.

Wherein: as shown in fig. 2, the oil and gas pipeline pig tracking system comprises a narrow linewidth laser 401, a 99:1 coupler 402, An Optical Modulator (AOM) 403, an optical amplifier (EDFA) 404 and a circulator 405 which are sequentially connected in series and generate a light source, wherein the circulator is connected with the optical fiber sensor, the circulator is simultaneously connected with a 50:50 coupler 406, a photoelectric detector 407, an acquisition card 408 and a preprocessor 409 are sequentially connected behind the 50:50 coupler, and the preprocessor is connected with a monitoring client 5; scattered light with the changed refractive index in the optical fiber sensor is subjected to coherent interference in a 50:50 coupler through a circulator and 1% of local light of a 99:1 coupler, then interference signals are detected through an optical detector, interference signals are collected by a collecting card to serve as vibration signals, and vibration signal preprocessing is carried out through a preprocessor to find out the position of the oil and gas conveying pipeline where the pipeline cleaner vibrates. When the pig carries out the dredging pipe operation along long defeated pipeline, can produce great vibration when passing through welding seam, joint position, the vibration can lead to the refractive index emission of the distributed optical fiber sensor of pipeline top to change, and then the modulation is the phase information of rayleigh scattered light signal dorsad, realizes the real-time supervision to the removal of pig in the long defeated pipeline.

A raman amplifier 410 is arranged between the circulator and the distributed optical fiber sensor, the raman amplifier is used as a bidirectional amplifier to further amplify the narrow pulse detection light modulated by the optical modulator amplified by the optical amplifier and send the amplified narrow pulse detection light to the optical fiber sensor, and meanwhile, the raman amplifier amplifies the scattered light with the changed refractive index and sends the amplified scattered light to the acquisition card through the circulator and the optical detector.

A narrow linewidth laser 401 arranged in the oil and gas pipeline pig tracking system emits a high-coherence narrow linewidth light source, emitted probe light passes through a 99:1 coupler 402, 99% pulse light is modulated into narrow pulse probe light through An Optical Modulator (AOM) 403, then optical signal amplification is carried out through an optical fiber amplifier (EDFA) 404, and the narrow pulse probe light is further amplified and emitted into an optical fiber sensor 3 through a circulator 405 and an amplifier 410; the back rayleigh scattered light in the fiber sensor 3 is subjected to coherent interference in a 50:50 coupler 406 through a circulator 405 and 1% local light of a 99:1 coupler, then an interference signal is detected through a photoelectric detector 407 serving as a balanced detector, the interference signal is collected as vibration data by an acquisition card 408, then vibration signal preprocessing is carried out through a preprocessor 409, and the preprocessed pig characteristic signal is shown in fig. 3.

Wherein: the optical fiber length of the optical fiber sensor is equal to or greater than the length of the oil and gas transmission pipeline, the sections are uniformly arranged in the oil and gas pipeline cleaner tracking system aiming at the optical fiber length sensed by the optical fiber sensor and provided with continuous section numbers, and the position of the cleaner in the oil and gas transmission pipeline is found out through a formula

The acquisition step is carried out by the user,

wherein:

s represents the positioning position of the pipe cleaner from the initial monitoring end of the oil and gas transmission pipeline, and the unit is m;

z represents a section number of a position corresponding to the V-shaped tip of the pig vibration signal;

z_uindicating the positioning resolution in m/segment.

Thus, it is possible to use the formula:obtaining the moving speed of the pipe cleaner;

wherein:

v represents the speed of movement of the pig in m/s;

t₁、t₂representing the time of detecting the vibration signal of the pig twice, unit s;

s₁represents t₁The positioning position of the pipe cleaner at any moment is m;

s₂represents t₂The location position of the pig at that moment, unit m.

The real-time position information of the pipe cleaner can be extracted and displayed in real time, and the information such as the moving speed of the pipe cleaner can be extracted.