CN209946076U

CN209946076U - Oil pipeline defect ultrasonic detection device

Info

Publication number: CN209946076U
Application number: CN201920794833.8U
Authority: CN
Inventors: 黄坤; 吴霞; 王祥; 王敏
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2019-05-30
Filing date: 2019-05-30
Publication date: 2020-01-14
Anticipated expiration: 2029-05-30

Abstract

An oil pipeline defect ultrasonic detection device, comprising: a pipe cleaning section, a defect detection section and a power supply section. Universal joints are adopted to connect the cleaning pipe joint and the defect detection joint and between the defect detection joint and the power supply joint. The pipe cleaning joint is mainly formed by overlapping two pairs of petal-type leather cups in a staggered mode, the petal-type leather cups are supported by the spaced leather cups, and the leather cups are driven by pressure difference, so that the detection device pushes the oil products in the transmission direction. The defect detection section comprises three rows of a plurality of ultrasonic sensors which are uniformly distributed along the circumferential direction, a probe signal processing system and an inertial navigation system. The power supply section comprises a data storage system and a battery, wherein the data storage system stores the ultrasonic signals, the inertial navigation signals and the mileage signals, and the battery provides power for the probe, the inertial navigation and the mileage wheel. The utility model discloses an oil pipeline defect ultrasonic detection device adopts the array probe, utilizes the ultrasonic reflection monopulse distance detection method analysis primary echo to detect the defect, not only can realize the comprehensive detection of pipeline inner wall defect, has effectively reduced defect data processing volume moreover.

Description

Oil pipeline defect ultrasonic detection device

Technical Field

The utility model relates to a pipeline ultrasonic internal detection area especially relates to a be used for oil pipeline defect ultrasonic detection device.

Background

The pipeline is an important transportation tool for oil and gas transportation and is a blood vessel for guaranteeing energy transmission. In recent years, the integrity and safety of pipelines has been widely appreciated. Most of oil and gas pipelines in China are built in the 70 and 80 years of the last century, most pipelines have potential safety hazards due to long service time, and newly laid pipelines also need to be checked and accepted for safety and integrity. Thus, challenges are presented to pipeline defect detection techniques.

The current common pipeline defect detection technology mainly comprises the following steps: the application of the magnetic leakage detection is the most extensive and mature, but the magnetic leakage detection is only suitable for the detection of ferromagnetic materials, and the detection signal characteristics and the shape characteristics of defects do not accord with the one-to-one correspondence relationship, so that the defect quantification problem needs to be further researched; the eddy current detection result is also easily interfered by various factors such as temperature, sensor movement speed and the like; compared with other detection methods, the ultrasonic detection method has the advantages of high detection precision, low cost, no harm to human bodies and environment and the like.

The data processing capacity of the ultrasonic defect detection device is a key performance index of the whole defect detector, and in the detection process by a pulse reflection method, if a plurality of inner wall reflection echoes occur, the wall thickness and the defect boundary cannot be accurately determined, and the wall thickness detection data volume is large and the processing is difficult. Therefore, how to reduce the data processing amount to improve the defect detection efficiency while ensuring the ultrasonic detection accuracy is a problem that needs further improvement.

Disclosure of Invention

The utility model discloses aim at improving ultrasonic wave defect detection sensitivity, reducing data processing volume to a certain extent, improve detection efficiency. Based on this, the utility model aims at providing an oil pipeline defect ultrasonic detection device adopts the ultrasonic reflection monopulse distance detection method, judges the defect through analyzing the primary echo, effectively reduces the defect data volume; and the number of the sensors is reasonably arranged in a probe array mode, so that the corrosion defect of the inner wall of the oil pipeline is detected on the premise of ensuring the detection effect. Meanwhile, the detection device also integrates a pipe cleaner, an inertial navigation system and a mileage wheel system, so that the functions of cleaning the pipeline, detecting defects and positioning the pipeline can be completed at one time, and the pipeline detection efficiency is improved.

The utility model adopts the technical proposal that:

an oil pipeline defect ultrasonic detection device, comprising: a pipe cleaning section, a defect detection section and a power supply section. Universal joints are adopted to connect the cleaning pipe joint and the defect detection joint and between the defect detection joint and the power supply joint. The pigging section is mainly formed by two pairs of petal-type leather cups in a staggered and overlapped mode, the petal-type leather cups are supported by the spaced leather cups, and the leather cups are driven by pressure difference, so that the oil conveying pipeline defect ultrasonic detection device pushes oil products in the conveying direction. Meanwhile, the deformation of the petal-type leather cup can reach 35%, the diameter-changing capability is good, and the blocking risk can be effectively reduced.

The defect detection section comprises three rows of ultrasonic sensors, a probe signal processing system and an inertial navigation system which are uniformly distributed along the circumferential direction. The probe array adopts three lines of 60 ultrasonic sensors to carry out full-coverage detection on the pipeline. The probe signal processing adopts STM32 single chip microcomputer control pulse generator, generates high voltage pulse, and controls the operation of the probe array sensor by the high voltage switch. The power supply section comprises a data storage system and a battery, the data storage system adopts the FPGA to store the ultrasonic signals, the inertial navigation signals and the mileage signals, and the battery provides power for the probe, the inertial navigation and the mileage wheel.

The inertial navigation system mainly comprises a gyroscope and a high-resolution accelerometer which are directly and fixedly connected in a defect detection section and are respectively used for measuring the angular motion and the linear motion of the device, and signals are stored in a data storage system.

The mileage wheel is arranged at the tail end of the battery section through the connecting rod and the support, and the position of the defect on the pipeline is determined by combining ultrasonic ranging and inertial navigation system data.

The utility model has the advantages that:

(1) the array probe and the ultrasonic reflection single pulse distance detection method are adopted, the defects are judged by analyzing the primary echo, the defect data volume is effectively reduced, and the comprehensive detection of the inner wall defects is realized.

(2) The defect depth is determined according to the ultrasonic ranging data, the position of the defect is determined by combining the odometer wheel data and the inertial navigation data, and the precision of defect positioning is improved.

(3) The pipe cleaner part has simple structure, and the petal-type leather cup is adopted to ensure that the pipe cleaner has good diameter-changing capability, thereby reducing the risk of blocking. Meanwhile, the universal joint is adopted to connect the detection device, and the pipeline with the variable diameter and the pipeline with the complex structure can be flexibly passed through.

(4) The utility model discloses oil pipeline defect ultrasonic detection device has fused the dredging pipe ware, has been used to system and mileage wheel system of leading, can once accomplish pipeline pigging, defect detection, locate function, has improved pipeline detection efficiency.

Drawings

FIG. 1 is a schematic structural diagram of an ultrasonic detection device for oil pipeline defects.

Figure 2 is a block diagram of the probe signal processing circuitry.

Fig. 3 is a block diagram of a data collection and storage process.

In the figure: 1. a leather cup; 2. a universal joint; 3. an array ultrasonic probe; 4. a probe signal processing system; 5. an inertial navigation system; 6. a data storage system; 7. a power source; 8. a support; 9. a connecting rod; 10. and (4) a mileage wheel.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

As shown in fig. 1, an oil pipeline defect ultrasonic detecting device includes: a pipe cleaning section, a defect detection section and a power supply section. Universal joints (2) are adopted to connect the cleaning pipe joint and the defect detection joint and between the defect detection joint and the power supply joint. The pipe cleaning joint is mainly formed by overlapping two pairs of petal-type leather cups (1) in a staggered mode, is supported by the spaced leather cups, and is driven by pressure difference, so that the oil conveying pipeline defect ultrasonic detection device pushes oil products in the conveying direction. The defect detection section (2) comprises three rows of a plurality of ultrasonic sensors (3) uniformly distributed along the circumferential direction, a probe signal processing system (4) and an inertial navigation system (5), and the whole-course monitoring is carried out on the pipeline while the pipeline is cleaned. The power supply section comprises a data storage system (6) and a battery (7), wherein the data storage system (6) stores the ultrasonic signals, the inertial navigation signals and the mileage signals, and the battery (7) supplies power to the probe, the inertial navigation and the mileage wheel (10).

The mileage wheel (10) is fixedly connected with the tail end of the battery section through a connecting rod (9) and a support (8), and mileage signals are stored in the data storage system (6) and used for determining the defect position.

The pipe cleaning section adopts two petal type leather cups to be staggered and stacked, the deformation of the leather cups can reach 35 percent, the whole device can be driven to be pushed forward by the pressure difference through the reducing pipeline flexibly.

The outer diameter of the leather cup in the pipe cleaning joint has certain interference magnitude relative to the inner diameter of the pipeline under the normal working state, and the interference magnitude is generally 2-5%. The probe array adopts 3 rows of 60-path sensors, the included angle between the rows is 4 degrees, and the included angle between adjacent probes in the same row is 12 degrees. Furthermore, the center frequency of the ultrasonic wave of the probe is designed to be 5MHz, and the STM32 singlechip controls the pulse generator to generate high-voltage pulse.

The probe wafer diameter was designed to be 8mm, taking into account the probe divergence angle effect.

The ultrasonic reflection single pulse distance detection is that the distance between the probe and the detection wall can be calculated by multiplying the time difference between the transmitted wave and the primary echo by the sound velocity of the ultrasonic wave in the medium.

The formula of ultrasonic ranging is as follows: l ═ C × T.

Wherein: l is the measured distance; c is the propagation speed of the ultrasonic wave in the medium; t is half the value of the transmit-to-receive time. The pipeline defect depth formula is as follows: t-L-h.

Wherein: t is the depth of the defect on the inner wall of the pipeline; h is the probe lift-off value.

As shown in figures 2 and 3, the probe signal processing adopts an STM32 single chip microcomputer to control a pulse generator, high-voltage pulses are generated, and the high-voltage switches are used for controlling the operation of the probe array sensor. The echo signal detected by the probe is firstly sent into a probe signal processing system, the echo signal is amplified through an amplification processing circuit, and the amplified signal is sent into a data storage system, converted into a digital signal by adopting an FPGA (field programmable gate array) and stored into an SD (secure digital) card.

As shown in fig. 3, a gyroscope and a high-resolution accelerometer in the inertial navigation system respectively measure angular motion information and linear motion information, the signals are transmitted to the FPGA through a bus driver after being amplified, and then all the signals acquired by the FPGA are transmitted to the SD card for storage. And when the pipeline detection is finished, taking out the data in the SD card and further analyzing and processing the data on the computer to obtain the relevant information of the pipeline defect.

Claims

1. An oil pipeline defect ultrasonic detection device, characterized by includes: cleaning pipe joints, defect detection joints and power supply joints; universal joints (2) are adopted to connect the cleaning pipe joint and the defect detection joint, and the defect detection joint and the power supply joint; the pipe cleaning joint is mainly formed by overlapping two pairs of petal-type leather cups (1) in a staggered mode, is supported by the spaced leather cups, and is driven by pressure difference, so that the oil pipeline defect ultrasonic detection device is pushed towards the oil product transmission direction; the defect detection section comprises three rows of a plurality of ultrasonic sensors (3) which are uniformly distributed along the circumferential direction, a probe signal processing system (4) and an inertial navigation system (5), and the whole-process monitoring is carried out on the pipeline while the pipeline is cleaned; the power supply section comprises a data storage system (6) and a battery (7), wherein the data storage system stores the ultrasonic signals, the inertial navigation signals and the mileage signals, and the battery provides power for the probe, the inertial navigation and the mileage wheel.

2. The ultrasonic oil pipeline defect detection device according to claim 1, wherein: the inertial navigation system (5) comprises a gyroscope and a high-resolution accelerometer which are directly and fixedly connected in the defect detection section and are respectively used for measuring angular motion information and linear motion information of the device.

3. The ultrasonic oil pipeline defect detection device according to claim 1, wherein: the mileage wheel (10) is arranged at the tail end of the battery section through the connecting rod (9) and the support (8), and the position of the defect on the pipeline is determined by combining ultrasonic ranging and inertial navigation system data.