System for monitoring displacement and strain of oil and gas pipeline

Abstract

The utility model discloses a system for monitoring displacement and strain of an oil and gas pipeline, which is used for monitoring the state of the oil and gas pipeline buried under a soil body and comprises GNSS (Global Navigation Satellite System) equipment, a coaxial cable demodulator, an MCS-51 singlechip, a data acquisition instrument, a coaxial cable and a plurality of coaxial cable sensors, the coaxial cable is arranged on the outer wall of the top of the oil-gas pipeline and extends in the axial direction of the oil-gas pipeline, the coaxial cable sensors connected to the coaxial cable in series are connected to the coaxial cable demodulator, and a rigid connecting rod of the outer sleeve is arranged at the preselected position of the outer wall of the top of the oil-gas pipeline. And the GNSS equipment is used for sensing the displacement of the oil and gas pipeline at the preselected position. The oil and gas pipeline deformation monitoring system integrates the advantages of point type detection and distributed detection, deformation monitoring of an oil and gas pipeline in a large range can be achieved, the electric quantity consumption of equipment is reduced, and the operation cost and the monitoring effect of the monitoring system are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to oil and gas pipeline health monitoring technical field relates to a kind of oil and gas pipeline displacement and strain monitoring system, specifically related to a kind of composite system using GNSS monitoring displacement and coaxial cable monitoring strain. BACKGROUND

[0002] As important infrastructure for energy transportation, the operation safety of oil and gas pipeline is directly related to the stable supply of energy and environmental protection. Since the pipeline is usually distributed in complex geographical conditions, such as mountainous areas, rivers, permafrost zones and areas with frequent geological activities, external environmental factors such as landslides, earthquakes, frost heaving and thawing sinking pose a serious threat to the structural safety of the pipeline. Therefore, how to efficiently and reliably monitor the displacement and strain of the pipeline and timely detect abnormal conditions has become a key issue for pipeline safety management.

[0003] In the monitoring project of oil and gas pipeline, common point monitoring methods include vibrating wire strain monitoring, GNSS displacement monitoring and soil pressure monitoring; distributed monitoring methods include optical fiber sensing based on BOTDA and BOTDR; quasi-distributed monitoring methods include coaxial cable strain sensing and optical fiber grating strain sensing. The current common monitoring methods have the following shortcomings: (1) only using GNSS technology to monitor oil and gas pipeline, when a large displacement of the pipeline is found, a large deformation will occur in most cases, since GNSS technology is a point sensing method, the distribution trend of large deformation in a certain length of the pipeline in the monitoring area cannot be obtained, which is not conducive to analysis and early warning; (2) only using coaxial cable technology for monitoring, since the power consumption is large, the monitoring frequency is low, the moment when the oil and gas pipeline changes from small strain to large strain cannot be timely detected, which delays early warning; (3) only using coaxial cable technology for high-frequency monitoring, the power consumption is large, after several consecutive rainy days, the solar cell system will run out of power, and the monitoring system will stop working. UTILITY MODEL CONTENT

[0004] Technical purpose: in view of the above technical problems, the utility model provides a system for monitoring displacement and strain of oil and gas pipeline, which can realize deformation monitoring in a large range of oil and gas pipeline, and reduce the power consumption of equipment, improve the operation cost and monitoring effect of the monitoring system.

[0005] Technical scheme: in order to achieve the above technical purpose, the utility model adopts the following technical scheme:

[0006] A system for monitoring displacement and strain of oil and gas pipeline is used to monitor the state of oil and gas pipeline buried in soil, characterized in that: the system comprises a GNSS device, a coaxial cable demodulator, an MCS-51 single-chip microcomputer, a data acquisition instrument, a coaxial cable and a plurality of coaxial cable sensors.

[0007] The coaxial cable is arranged on the top outer wall of the oil and gas pipeline and extends along the axial direction of the oil and gas pipeline, a plurality of coaxial cable sensors are distributed on the coaxial cable, each coaxial cable sensor is used for detecting the displacement of the coaxial cable and is electrically connected with the coaxial cable demodulator;

[0008] A rigid connecting rod of a sleeve is arranged at a preselected position of the top outer wall of the oil and gas pipeline, the bottom of the rigid connecting rod is fixed in the soil and the top of the rigid connecting rod is connected with the GNSS device on the ground, and the GNSS device is used for sensing the displacement of the oil and gas pipeline at the preselected position;

[0009] The MCS-51 single-chip microcomputer is arranged between the GNSS device and the coaxial cable demodulator, the MCS-51 single-chip microcomputer is provided with a serial receiving port RXD and a serial sending port TXD, and the serial receiving port RXD and the serial sending port TXD are connected with the RS232 interface arranged on the GNSS device and the coaxial cable demodulator (6) respectively, and the GNSS device wakes up the coaxial cable demodulator from the sleep state through the MCS-51 single-chip microcomputer.

[0010] Preferably, the system further comprises a cloud computer, and the data acquisition instrument is wirelessly connected with the cloud computer.

[0011] Preferably, the system further comprises a solar power supply system provided with a storage battery, and the GNSS device, the coaxial cable demodulator and the data acquisition instrument are connected with the solar power supply system through wires.

[0012] Beneficial effects: due to the adoption of the above technical scheme, the utility model has the following beneficial effects:

[0013] The utility model comprehensively uses the advantages of point detection and distributed detection, can realize deformation monitoring in a large range of the oil and gas pipeline, reduces the power consumption of the equipment, and improves the operation cost and monitoring effect of the monitoring system. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a monitoring system schematic view for monitoring oil and gas pipeline displacement and strain;

[0015] Figure 2 It is a connection schematic view among the GNSS device, the MCS-51 single-chip microcomputer and the coaxial cable demodulator;

[0016] Wherein, 1, oil and gas pipeline, 2, outer sleeve, 3, rigid connecting rod, 4, GNSS device, 41, RS232 interface of GNSS, 5, MCS-51 single-chip microcomputer, 51, serial receiving port RXD, 52, serial sending port TXD, 6, coaxial cable demodulator, 61, RS232 interface of coaxial cable demodulator, 7, data line, 8, data acquisition instrument, 9, cloud computer, 10, wire, 11, solar power supply system containing battery, 12, coaxial cable, 13, coaxial cable sensor. DETAILED DESCRIPTION

[0017] The embodiments of the utility model will be described below in detail in combination with the drawings.

[0018] Example one

[0019] As Figure 1 shown, the embodiment provides a kind of for oil and gas pipeline displacement and strain monitoring system, oil and gas pipeline 1 is buried in soil, and the top outer wall of oil and gas pipeline 1 is equipped with coaxial cable 12, and multiple coaxial cable sensors 13 are distributed on coaxial cable 12, multiple coaxial cable sensors 13 in series on coaxial cable 12 are fixed on oil and gas pipeline 1 to carry out the quasi-distributed measurement of strain, and coaxial cable sensor 13 calculates strain by measuring the change of sensor spacing.Coaxial cable 12 is single-ended into coaxial cable demodulator 6.The certain position P of the top of oil and gas pipeline 1 is connected to the GNSS device 4 on ground by the rigid connecting rod 3 equipped with outer sleeve 2.GNSS device 4 is used to sense the displacement of oil and gas pipeline 1 at P.GNSS device 4 wakes up coaxial cable demodulator 6 by MCS-51 single-chip microcomputer 5.

[0020] The working mode that GNSS device 4 wakes up coaxial cable demodulator 6 is as Figure 2 shown.When GNSS device 4 monitors larger displacement, signal is sent to the serial receiving port RXD51 of MCS-51 single-chip microcomputer 5 by RS232 interface 41.MCS-51 single-chip microcomputer 5 sends wake-up instruction to the RS232 interface 61 of coaxial cable demodulator by serial sending port TXD52 after receiving the signal of serial receiving port RXD51, so that coaxial cable demodulator 6 changes from sleep state to working state.

[0021] In this embodiment, the rigid connecting rod 3 and the lower half of the outer sleeve 2 are buried in the soil, and the upper half is exposed to the air. The load of the soil acts on the outer sleeve 2, thereby greatly protecting the rigid connecting rod 3 from the interference of the soil. Since the rigid connecting rod 3 is rigid and the deformation is negligible, the displacement of point P of the oil and gas pipeline 1 can be measured. The rigid connecting rod 3 is directly connected with the GNSS device 4, and the rigid connecting rod 3 serves as the base of the GNSS device 4. When the rigid connecting rod 3 is displaced, the GNSS device 4 is moved, thereby sensing the displacement of point P of the oil and gas pipeline 1. The rigid connecting rod 3 is connected in the form of serving as the base of the GNSS device 4.

[0022] The GNSS device 4, the coaxial cable demodulator 6, and the data acquisition instrument 8 are connected with the solar power supply system 11 containing a storage battery through the wire 10 for power supply. The GNSS device 4 can adopt the conventional GNSS displacement monitoring station, which includes a GNSS receiver, an antenna, a control unit, a data storage device, a data sensing device, etc. The GNSS device 4 utilizes the positioning capability of the satellite navigation system to monitor the displacement of the rigid connecting rod in real time. The common GNSS devices include the HC-PXS160 of the marine navigation system and the F-DW100 of the Xiamen Sishen Internet of Things Technology Co., Ltd.

[0023] The working principle of the system is as follows:

[0024] Initially, the GNSS device 4 works, and the monitoring frequency is high. The preferred high monitoring frequency ranges from 10 to 30 times / hour, and the coaxial cable demodulator 6 is in a sleep state, and the power consumption is extremely small.

[0025] When the GNSS device 4 measures a large displacement, the monitoring frequency is reduced, a signal is sent to the MCS-51 single-chip microcomputer 5 through the RS232 interface 41 of the GNSS, the MCS-51 single-chip microcomputer 5 sends a wake-up instruction to the coaxial cable demodulator 6, and the coaxial cable demodulator 6 is woken up to perform strain measurement. The large displacement of the GNSS is 5 to 20 mm. When a large displacement occurs, the monitoring frequency of the GNSS is reduced to 1 to 2 times / hour.

[0026] The displacement data measured by the GNSS device 4 and the strain data measured by the coaxial cable demodulator 6 are transmitted to the data acquisition instrument 8 through the data line 7;

[0027] The data acquisition instrument 8 transmits the two kinds of data to the cloud computer 9 through wireless transmission, and the cloud computer 9 analyzes and warns.

[0028] The system designed in the utility model, when oil and gas pipeline bears small displacement, only GNSS equipment 4 works, and the monitoring frequency is higher, coaxial cable demodulator 6 is in sleep state; after GNSS equipment 4 monitors larger displacement, coaxial cable demodulator 6 is woken up, and GNSS monitoring frequency is reduced, coaxial cable demodulator 6 is in standby state normally, and the power consumption is very small. The saved electric quantity is used for the monitoring of coaxial cable with low monitoring frequency, and the coaxial cable has the characteristics of quasi-distributed and the ability of monitoring large deformation, and the monitoring effect is better when pipeline bears larger displacement.

[0029] The basic principle, main features and advantages of the utility model are shown and described above. The skilled in the art should understand that the above examples do not limit the utility model in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the utility model.

Claims

1. A system for monitoring displacement and strain of oil and gas pipelines, used to monitor the state of oil and gas pipelines (1) buried in soil, characterized in that: The system includes a GNSS device (4), a coaxial cable demodulator (6), an MCS-51 microcontroller (5), a data acquisition unit (8), a coaxial cable (12), and several coaxial cable sensors (13); The coaxial cable (12) is set on the top outer wall of the oil and gas pipeline (1) and extends along the axial direction of the oil and gas pipeline (1). Multiple coaxial cable sensors (13) are distributed on the coaxial cable (12). Each coaxial cable sensor (13) is used to detect the displacement of the coaxial cable and the electrical signal is connected to the coaxial cable demodulator (6). The oil and gas pipeline (1) is provided with a rigid connecting rod (3) of the outer sleeve (2) at a pre-selected position on the top outer wall. The bottom of the rigid connecting rod (3) is fixed in the soil and the top is connected to the GNSS device (4) on the ground. The GNSS device (4) is used to sense the displacement of the oil and gas pipeline (1) at the pre-selected position. An MCS-51 microcontroller (5) is installed between the GNSS device (4) and the coaxial cable demodulator (6). The MCS-51 microcontroller (5) is equipped with a serial receiving port RXD (51) and a serial transmitting port TXD (52), which are respectively connected to the RS232 interfaces installed on the GNSS device (4) and the coaxial cable demodulator (6).

2. The system for monitoring displacement and strain in oil and gas pipelines according to claim 1, characterized in that: The system also includes a cloud computer (9), and the data acquisition device (8) is wirelessly connected to the cloud computer (9).

3. The system for monitoring displacement and strain in oil and gas pipelines according to claim 1, characterized in that: The system also includes a solar power system (11) equipped with a battery, and the GNSS equipment (4), coaxial cable demodulator (6), and data acquisition instrument (8) are connected to the solar power system (11) via wires (10).

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