A kind of compressed natural gas storage well the cannot-harm-detection deviceTechnical field
The present invention relates to a kind of the cannot-harm-detection device, is the cannot-harm-detection device that can detect the defect of the in-service compressed natural gas underground storage well borehole wall and shaft bottom end socket specifically.
Background technology
Non-Destructive Testing is the detection technique of emergence and development on modern science basis, it is by the technology of advanced person and instrument and equipment, when not damaging, not changing detected object physics and chemistry state, the inside of detected object and surface structure, character, state are carried out to inspection and the test of high sensitivity and high reliability, so as to pass judgment on they continuity, integrality, security and other performance index.At present, the common method of Non-Destructive Testing has supersonic testing method, detection method of eddy, ray detection method, Magnetic Flux Leakage Inspecting method etc.
Ultrasonic Detection is that the information utilizing the interaction of ultrasound wave and object to provide realizes.Sound wave can be propagated in a metal.The weak point of this method is that ultrasound wave is decayed very soon in atmosphere, generally wants sound wave propagation medium, as couplants such as oil or water during detection.And the gas storage well to in-service work, Ultrasonic Detection cannot be implemented.
Detection method of eddy is by electromagnetic induction principle work, so detection method of eddy can detect surface imperfection and the near surface flaw of workpiece.The distinguishing feature of detection method of eddy works to conductive material, and not necessarily ferromagnetic material, but poor to the effect of ferromagnetic material.Secondly, the smooth finish, flatness, Bian Jie etc. on workpiece for measurement surface have considerable influence to eddy current, therefore normal carrying out flaw detection detection method of eddy being used for the nonferromagnetic workpiece such as more regular to shape, surperficial brighter and cleaner copper pipe.
Ray detection method is that to detect, inside workpiece is discontinuous, the lossless detection method of structure or thickness etc. for the physical influence (change, scattering etc. as radiation intensity) utilizing ionising radiation and Substance Interactions to produce.Ray detection method mainly has higher sensitivity for volumetric Defect detection.Its detection for crackle affects comparatively large by angle, therefore ray detection method is suitable for volumetric defects detection, and is not suitable for area-type defects detection.Due to the restriction of physical condition, during the in-service work of gas storage well, film is difficult to place, therefore ray detection method feasibility is lower.
Magnetic Flux Leakage Inspecting method is that the leakage flux detecting fault location formation carries out detecting a flaw, and it is only applicable to ferromagnetic material, and after only having ferromagnetic material to be magnetized, surface and near surface flaw could form leakage flux at surface of the work.Simultaneously in Magnetic Flux Leakage Inspecting, magnetization is the condition precedent realizing detecting, and can it decides measurand produce measured and field signal that is that be resolved, also affects the performance characteristic of detection signal and the architectural feature of measurement mechanism simultaneously.The mechanism of Magnetic Flux Leakage Inspecting determines the complicacy of pick-up unit, also the corresponding unreliability adding detection system.
To the visual Non-Destructive Testing of the in-service compressed natural gas storage well borehole wall and shaft bottom end socket defect, examined environmental impact is comparatively large, and lacks quantitative ability, there is no suitable effective video recording geometry at present.
Summary of the invention
The problem to be solved in the present invention is to provide a kind of compressed natural gas storage well the cannot-harm-detection device, this device adopts micro-magnetic sensor to detect the terrestrial magnetic field magnetic flux by the gas storage well borehole wall and shaft bottom end socket, analyze, testing process is without the need to driving source, also without the need to propagation medium, reliability is high, achieve to in-service compressed natural gas underground storage well safe, harmless, accurately detect.
For solving the problem, take following technical scheme:
The feature of compressed natural gas storage well the cannot-harm-detection device of the present invention comprises tripod, winch, winch controller and master controller.There is follower on the top of described tripod, and there is pick-up unit the below of follower.Described winch has hawser, the overhanging end of hawser by after the follower break-in on tripod with the top of pick-up unit in being fixedly connected with.Described winch is connected with described winch controller by wire, and winch controller is connected with described master controller by wire.Described pick-up unit comprises the cylinder be arranged vertically, data acquisition unit and power-supply controller of electric is had in this cylinder, there is probe the lower end of cylinder, probe there is micro-magnetic sensor, micro-magnetic sensor is connected with data acquisition unit by wire, data acquisition unit is by wire and power-supply controller of electric, and power-supply controller of electric is connected with described master controller by wire.
Further improvement of the present invention scheme is that described probe has eddy displacement sensor, eddy current prime amplifier is had in cylinder, eddy displacement sensor is connected with eddy current prime amplifier by wire, and eddy current prime amplifier is connected with described power-supply controller of electric by wire.
Further improvement of the present invention scheme is that described probe has high-definition camera, and this high-definition camera is connected with described power-supply controller of electric by wire.
Wherein, the top of described cylinder is detection bodies, and bottom is centralizer, is bi-directionally connected lid is connected between the lower end of detection bodies with the upper end of centralizer by first, and the lower end of centralizer has second to be bi-directionally connected lid.Central shaft is had in described centralizer, the upper end of central shaft is bi-directionally connected lid through first and is embedded in detection bodies, the lower end of central shaft is bi-directionally connected lid with probe in being fixedly connected with through second, and central shaft and first is bi-directionally connected and covers, second is bi-directionally connected between lid and is all rotating by bearing, overlapping outside that section of central shaft between centralizer and probe has protective cover.Described power-supply controller of electric is positioned at detection bodies, has reductor in detection bodies, and power-supply controller of electric is connected with reductor by wire, between the output terminal of reductor and the upper end of central shaft by gear in being linked.
Take such scheme, have the following advantages:
Because there is probe the cylinder lower end of compressed natural gas storage well the cannot-harm-detection device of the present invention, probe there is micro-magnetic sensor, micro-magnetic sensor is connected with data acquisition unit by wire, data acquisition unit is connected with power-supply controller of electric by wire, power-supply controller of electric is connected with master controller by wire, and the cylinder of this pick-up unit by tripod as support, its lifting is controlled again by winch and follower, therefore the cylinder of this pick-up unit can control by winch the optional position extending into compressed natural gas underground storage well, and detect the magnetic flux of geomagnetic field on the gas storage well borehole wall and shaft bottom end socket by micro-magnetic sensor, data acquisition unit is utilized to gather these magnetic flux data, and send master controller analysis to, thus the object detecting the in-service well for storage borehole wall and shaft bottom end socket defect can be realized.This pick-up unit utilizes micro-magnetic sensor to detect the magnetic flux of this intrinsic magnetic field of the earth on the gas storage well borehole wall and shaft bottom end socket, realize the Non-Destructive Testing of in-service compressed natural gas underground storage well, without the need to arranging driving source in addition, also without any need for propagation medium, security is high; And the fit structure of its tripod, follower and winch can realize probe carries out continuous, stable detection to any position section of gas storage well, detect data accurate, reliability is high.
Probe increases eddy displacement sensor is set, and eddy current prime amplifier is set in uploading on circuit of probe, make this pick-up unit possess the function of EDDY CURRENT, gas storage well pipeline can be detected whether because external force deforms, make the measuring ability of this device more diversified.
Probe increases high-definition camera is set, make this pick-up unit when stretching into well for storage, image transmission in well can be shown to master controller, the Non-Destructive Testing of magnetic method is combined with visual, makes testing staff can judge the situation of the borehole wall and shaft bottom end socket more intuitively.
The mode that the cylinder of pick-up unit of the present invention adopts detection bodies to be connected with one heart with centralizer, and arrange in centralizer central shaft with probe be connected, in detection bodies, arrange reductor be connected with central shaft, not only making pops one's head in possesses the function of 360 degree of rotated detections, can also guarantee that detection bodies, centralizer and probe are coaxial all the time, improve the serviceable life of accuracy of detection and equipment.
Accompanying drawing explanation
Fig. 1 is the one-piece construction schematic diagram of compressed natural gas storage well the cannot-harm-detection device of the present invention;
Fig. 2 is the structural representation of pick-up unit in Fig. 1.
Embodiment
As depicted in figs. 1 and 2, compressed natural gas storage well the cannot-harm-detection device of the present invention comprises tripod 1, winch 10, winch controller 11 and master controller 12.There is follower 5 on the top of described tripod 1, and there is pick-up unit the below of follower 5.Described winch 10 has hawser 8, the overhanging end of hawser 8 by after follower 5 break-in on tripod 1 with the top of pick-up unit in being fixedly connected with.Described winch 10 is connected with described winch controller 11 by wire, and winch controller 11 is connected with described master controller 12 by wire.Described pick-up unit comprises the cylinder be arranged vertically, and the top of cylinder is detection bodies 2, and bottom is centralizer 3, is bi-directionally connected lid 6 is connected between the lower end of detection bodies 2 with the upper end of centralizer 3 by first, and the lower end of centralizer 3 has second to be bi-directionally connected lid 7.Central shaft 16 is had in described centralizer 3, the upper end of central shaft 16 is bi-directionally connected lid 6 through first and is embedded in detection bodies 2, the lower end of central shaft 16 is bi-directionally connected lid 7 through second and extends, and central shaft 16 and first is bi-directionally connected lid 6, second and is bi-directionally connected between lid 7 and is all rotating by bearing.Have power-supply controller of electric 17 and reductor 13 in described detection bodies 2, power-supply controller of electric 17 is connected with reductor 13 by wire, between the output terminal of reductor 13 and the upper end of central shaft 16 by gear in being linked.The lower end (i.e. overhanging end) of described central shaft 16 is connected with probe 4, and overlapping outside that section of central shaft 16 between centralizer 3 and probe 4 has protective cover 21.Described probe 4 there are micro-magnetic sensor 18, eddy displacement sensor 19 and high-definition camera 20, data acquisition unit 14 and eddy current prime amplifier 15 is had in described centralizer 3, micro-magnetic sensor 18 is connected with data acquisition unit 14 by wire, eddy displacement sensor 19 is connected with eddy current prime amplifier 15 by wire, data acquisition unit 14, eddy current prime amplifier 15 and high-definition camera 20 are all connected with described power-supply controller of electric 17 by wire, and power-supply controller of electric 17 is connected with described master controller 12 by wire.
Smooth and easy in order to enable the cylinder of pick-up unit move when stretching into underground gas storage well conduit, the wire that described power-supply controller of electric 17 is connected with master controller 12 stretches out from the upper end of cylinder, and this wire can be merged into one cable with the hawser 8 on winch 10, like this, cylinder would not be subject to impeding of wire when declining, and the dropping distance of cylinder also can be decided by the length of winch 10 upper cable 8 completely.
Compressed natural gas storage well the cannot-harm-detection device of the present invention is made up of electromagnetic nondestructive detection system and downhole video system.The electromagnetic nondestructive of gas storage well barrel defect is the coupling effect utilizing the gas storage well borehole wall and terrestrial magnetic field, damage status is judged by magnetic field intensity, the field decay amount of measuring gas storage well barrel, judge well radius variations situation by measuring eddy current displacement change, the two result comprehensive detects gas storage well total quality characteristic and assesses.Judge position and the size of defect by carrying out data processing and imaging to the signal collected, realize the borehole wall, the local corrosion of shaft bottom end socket and the detection of crack defect.The magnetic method that this function mainly controls detection system by master controller 12 detects whirligig (i.e. the bindiny mechanism of reductor 13, central shaft 16, the probe 4) scanning of realization to gas storage well bottom bulkhead.Gas storage well downhole video recording geometry is in fact the underwater video system for real-time omnibearing observation gas storage well internal state.While Non-Destructive Testing is carried out to gas storage well, can the situation of comprehensive real-time monitored gas storage well inside, when probe 4 is at end socket place, shaft bottom wheel measuring, the working condition of probe 4 can be observed, also for detect security provides certain guarantee under the prerequisite of auxiliary detection.The electromagnetic nondestructive testing of gas storage well borehole wall defect is combined with gas storage well downhole video observation technology, overall thoroughly evaluating can be carried out to the well for storage of in-service compressed natural gas more efficiently and accurately.