CN102072714A - Improved system and method for detecting wall thickness and corrosion of well casing of gas storage well - Google Patents
Improved system and method for detecting wall thickness and corrosion of well casing of gas storage well Download PDFInfo
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- CN102072714A CN102072714A CN2010105370971A CN201010537097A CN102072714A CN 102072714 A CN102072714 A CN 102072714A CN 2010105370971 A CN2010105370971 A CN 2010105370971A CN 201010537097 A CN201010537097 A CN 201010537097A CN 102072714 A CN102072714 A CN 102072714A
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Abstract
The invention discloses an improved system and method for detecting wall thickness and corrosion of a well casing of a gas storage well. The system comprises an overground signal processing part and an underground signal receiving and transmitting part arranged inside the gas storage well, wherein the overground part is provided with a mobile detection device connected with the underground part through an armored composite wire, and the detection device is provided with a dragging part and a control terminal; a coaxial cable in the armored composite wire inputs a plurality of collected analog probe signals into a computer, and the computer finishes digital conversion of analog signals and processing of data signals; the signal processing part moves up and down on the inner wall of the well casing through a centralizer; an annular water immersion analog probe array is also arranged; and the armored composite wire is manufactured by winding the coaxial cable for signal transmission with an underground instrument power cord layer by layer and winding a steel wire at the outermost layer, and the coaxial cable and the power cord share one multi-core waterproof seal joint. An encoder is directly installed at the wire swinging part in front of a roller, and the joint of encoder and the computer are in fixed connection. The system disclosed by the invention has stronger reliability and better vibration resistance, and can operate for a long time without faults.
Description
Technical field
Gas storage well bore wall thickness and corrosion detection system are all kinds gas storage wells that uses at relevant facility such as gas station, peak regulation station specially with method, carry out wall thickness measuring and extent of corrosion and detect, with non-destructive detecting device and the technological means of assessing its safety case.
Background technology
Along with the worsening shortages of petroleum products, the price of product oil is more and more higher, and serious day by day as the energy problem of automobile main fuel with gasoline.In recent years, along with the deployment and the enforcement of national clean energy resource strategy, be that the automobile of the energy begins emerge in multitude with the rock gas.The great advantage of rock gas power car is the not only very low but also environmental protection of operation cost, therefore is subjected to very much the welcome of society.Common gasoline car just can use rock gas as power source through simple refit, can make operation cost reduce by 60%, so occurred much being used for the natural gas filling station of motor vehicle in recent years in each big city, the whole nation.The device of natural gas-storing mainly is a kind of underground gas storage equipment-gas storage well in most of gas station, and gas storage well is buried underground and take up an area of for a short time, is very suitable for the gas storage of gas station.Yet after use after a while, gas storage well tends to be subjected to the corrosion of gas, greasy dirt and near-borehole formation medium in the well, makes pit shaft produce corrosion and wall thickness attenuation, thereby the load-bearing capacity of gas storage well is reduced, so that can't guarantee safety, fracture finally may take place make the well body go out ground.
At present, when utilizing existing technology that body is implemented wall thickness measuring and corrosion detection dual mode is arranged, a kind of is manual detection, and promptly hand-held thicknessmeter carries out pointwise and detects; Another kind is automatic detection, promptly relies on mechanical hook-up to finish automatically.These two kinds of methods all are on the ground body to be detected, and can't be used for underground equipment.Can reach 300 meters gas storage well for depth capacity, all lack the thickness measuring that is used for gas storage well always and corrode the professional equipment that detects.
Gas storage well belongs to special equipment, the safety of its safety case direct relation people's lives and properties.At present, the whole nation has with more than 5000 of gas storage well, and it is in all parts of the country to distribute, and has become the main storage facilities of a lot of urban automobile fuel-rock gases, therefore, its safety case how and down time length all may be related to the stable of urban society.2008, country has issued the whole nation at the file of implementing periodic inspection with gas storage well, in order effectively to implement inspection for gas storage well, find out the safety case of gas storage well, expose the problem of its existence, China special inspection institute in 2009 has invented and has been used for the gas storage well bore wall thickness measuring and corrodes equipment and the method that detects.Equipment is made of three parts: aboveground instrument, transmission line and subsurface equipment, aboveground and subsurface equipment all is made of computing machine, both transmit data by ICP/IP protocol, again because long distance, transport layer is finished with optical fiber, be that subsurface equipment sends to network interface with data, packet is converted to light signal sends to optical fiber through electro-optical conversioning device again that the packet that aerial part converts electric signal to through electrical to optical converter is again sent into aboveground instrument network interface and obtained real-time detection data.Before not having better apparatus and method, this apparatus and method have solved gas storage well and have been badly in need of the predicament that detects, but along with advancing of testing one gone into deeply, its problem also highlights, mainly contain following several:
Subsurface equipment submerges when one, detecting, and does not also patch convenient durable optical fiber seal joint at present;
Two, the power supply of subsurface equipment must must be finished by cable, and the transmission signals optical cable, so the line that aboveground part has two on optical cable and cable to separate inserts subsurface equipment, optical cable and cable twine easily, need artificial optical cable and the cable of separating when causing instrument to rise, have to interrupt uphill process when serious.If not noting unwrapping wire, this interruption when in fact descending is frequent the appearance.For avoiding this interruption, need to advance just to note unwrapping wire in decline, so just increased manpower;
Three, subsurface equipment adopts computer patterns, and inevitable vibration all can cause the computing machine cisco unity malfunction during owing to detection, detects when crashing midway, and whole gas storage well has to detect again;
Four, from the down-hole to aboveground instrument, signal transmission the device of process too much, the fault of any one device can both make to detect interrupts;
Five, optical cable needs often to change, and cost is too high.
Six, scrambler places the fixed pulley part, and every detection a bite gas storage well all need be reinstalled scrambler, and the scrambler line do not add armour, and is fragile.
Owing to above some reason, cause breakdown rate than higher, its movability, dirigibility can not meet the demands fully.So the invention property improved instrument.
Summary of the invention
The objective of the invention is to improve gas storage well bore wall thickness and corrosion detection system and method, gas storage well bore wall thickness and corrosion are carried out the effect that high efficient and reliable detects, simplify workflow lowering apparatus failure rate simultaneously to reach.
The present invention realizes by the following technical solutions:
A kind of modified gas storage well bore wall thickness and corrosion detection system comprise signal processing part on the ground and are arranged on underground signal transmitting and receiving portion in the gas storage well; Aerial part is provided with the portable pick-up unit that is connected with under ground portion by the armouring complex line, and this pick-up unit is provided with the portion of pulling and control terminal; The output terminal of armouring complex line is connected with the computing machine of aboveground signal processing part, several analog quantity probe signals that collect, finishes processing to Analog signals'digital conversion and data-signal by computing machine;
Described signal processing part is insinuated in the gas storage well bore by ground by pulling portion, moves up and down at shaft in wall by centralizer; The annular water logging analog quantity linear transducer array of forming by at least two layers of probe in addition that is connected with centralizer;
Described several analog quantity probes are visited the system periodic duty by a FPGA program, and described FPGA program Solidification is on circuit board;
Concentric cable and subsurface equipment power lead layering winding, outer winding steel wire that described armouring complex line is used by transmission signals are made the shared multicore WATERPROOF PACKING GLAND of concentric cable and power lead.
Aforesaid centralizer is provided with a plurality of supporting legs that roll and contact with shaft in wall; Axial direction at centralizer is provided with spring.
The aforesaid portion of pulling comprises cylinder and fixed pulley, on the cycloid before the cylinder scrambler of fixedlying connected with computing machine is arranged.
A kind of modified gas storage well bore wall thickness and corrosion detecting method may further comprise the steps:
Step 3, startup computing machine are placed underwater portion to well, regulate the centralizer part, and the centralizer supporting leg is just contacted with gas storage well; The assurance linear transducer array is coaxial parallel with gas storage well;
Step 5, computing machine are obtained the probe signal of a complete cycle from the coaxial electrical cable-end;
The ownership of step 6, computer-made decision data, and in the belonging positions ultrasonic thickness measurement data of drawing, the real time data image shows at corresponding on-screen display (osd) area;
Step 7, judge whether to finish detection, as finish detection and then store data image or print data image; As not finishing detection, then turn back to step 4 by computer control;
The rise and fall of described probe work and instrument are carried out simultaneously;
Annular immersion probe array certain angle that on the circumferencial direction between the layer, staggers.
This modified gas storage well bore wall thickness and corrosion detection system and method compared with prior art have following remarkable advantages and beneficial effect:
One, signal transmssion line and subsurface equipment supply lines and instrument suspension line combine, and a shared multicore joint, connect quick and convenient and the instrument lifting freely, need not human intervention;
Two, subsurface equipment is the programme controlled simple cycle of a FPGA system, and compared with computer operating system, reliability is stronger, and vibration resistance is better, failure-free operation in the time of can growing.
Three, scrambler is fixedly connected, and is time saving and energy saving;
Four, the flow process that simplifies the operation alleviates testing staff's load, improves detection efficiency.
Description of drawings:
Fig. 1 is gas storage well bore wall thickness and corrosion detecting method process flow diagram;
Fig. 2 is the detection system connection diagram;
Fig. 3 is an armouring complex line sectional view;
Fig. 4 is an armouring complex line cylinder synoptic diagram;
Fig. 5 is the closed and open configuration synoptic diagram of the interior instrument supporting leg of the well of detection system;
Fig. 6 is the centralizer structure synoptic diagram;
Fig. 7 is double-deck linear transducer array front elevation in this device;
Fig. 8 is the probe layer synoptic diagram.
The each several part explanation: 1 is portable pick-up unit; 2 is cylinder; 3 is the armouring complex line; 4 motors; 5 is fixed pulley; 6 is computing machine; 7 is the instrument sealing bore; 8 is centralizer; 9 is annular immersion probe array; 10 is scrambler; 11 is gas storage well; 81 is the centralizer regulator; 82 is the centralizer supporting leg; 83 are the roller on the centralizer supporting leg; 84 is the centralizer coil tension spring; C1P1 is first probe of first probe layer; C2P1 is first probe of second probe layer; 31 is concentric cable; 32 is power lead; 33 is steel wire.
Embodiment
The present invention is further illustrated below in conjunction with Figure of description:
See also shown in Figure 1ly, be modified gas storage well bore wall thickness and corrosion detecting method process flow diagram.
Modified gas storage well bore wall thickness and corrosion detecting method, at first fills with water in 11 gas storage wells installs fixed pulley 5 at well head, and the position of portable pick-up unit 1 makes armouring complex line 3 to enter in the gas storage well 11 by pulley 5 smoothly.Subsurface equipment is connected with the armouring complex line, and portable in the present embodiment pick-up unit 1 is a packaged type detection system car.
At equipment before, improvement of the present invention has:
In conjunction with site environment, detect and use the noise of supersonic range very little, so discard optical fiber transmission signal, directly the analog quantity probe signal is transferred to aboveground instrument with the armouring complex line.Analog signals'digital conversion and processing are all finished by aboveground computing machine.Like this subsurface equipment only need control the probe periodic duty just can, concentric cable in the signal time division multiplex armouring complex line of each probe is transferred to aboveground instrument, underground signal be transferred to ground the device of process significantly reduce, certainly reduced failure rate, and the periodic duty of control probe only needs a simple FPGA program just can finish, saved computing machine, the reliability that is solidificated in the FPGA program on the circuit board is higher than computer operating system far away, and resistance to shock improves greatly.
The armouring complex line is made by concentric cable and subsurface equipment power lead layering winding, outer winding steel wire, has solved the problem that signal wire separates with supply lines, just lifting freely of subsurface equipment like this.The shared multicore WATERPROOF PACKING GLAND of concentric cable and power lead patches convenient reliable.
Scrambler directly is installed on the cycloid part before the cylinder, and its joint and computing machine are in fixedlys connected state, needn't remove to install scrambler again, and while scrambler line is difficult for being damaged in inspection vehicle.
At first open the subsurface equipment power supply, this moment, subsurface equipment was started working, and the FPGA program is at first added an identification signal sign indicating number to coaxial cable port, excites first probe then, and after exciting, instrument can be reserved time enough by this probe received signal; Excite second probe again, wait for second probe received signal; Excite the 3rd probe ... until last probe received signal finishes, add an identification signal sign indicating number again to coaxial cable port, excite first probe then ... periodic duty so ceaselessly.All these signals all join with coaxial cable port, because excite and the time of waiting for received signal of each probe all are identical and configure in advance, so the signal after computing machine just can confirm by the identification code before first probe signal on the ground is first probe, week regular time, the signal of after date was second probe, again Zhi Hou cycle regular time be the 3rd probe one to the signal that arrives a last probe.Like this, the signal transmission of just a certain at last moment probe is bad, does not get normal signal, so also is can not obtaining of this cycle period, still can get all probe signals of next cycle period by identification code successively.
Then, start computing machine 6, place in the well instrument and to well, regulate centralizer regulator 81, each supporting leg of centralizer is just contacted with gas storage well 11 inwalls, at this moment just can guarantee the coaxial parallel of annular linear transducer array 9 and gas storage well 11.Regulating cylinder leads and drags device and determine that instrument is to the initial detection position that needs in the well.Start detection software detects software at this moment and is in listening state, after recognizing identification code afterwards, at times signal is afterwards belonged to obstructed probe successively, and in corresponding on-screen display (osd) area demonstration, the high speed operation successively of respectively popping one's head in the linear transducer array detects corresponding pit shaft part.Instrument is risen or is descended by drum apparatus control in the well, by the scrambler on the cycloid before the cylinder 10, computing machine 6 can accurately be known the instrument displacement, and detector is controlled probe work again, finish this a part of testing, and data presentation in corresponding screen area.In actual detection, the rise and fall of probe work and instrument are carried out simultaneously, different probes can be directly show at the respective regions of screen with the form of image in real time in the detection data of each diverse location, form gas storage well wall thickness and etch state image for analysis, preserve data and image after detection is finished.
See also shown in Figure 2ly, be the detection system connection diagram; Comprise control part on the ground, signal processing part and the ultrasonic signal receiving and transmitting part that is arranged in the gas storage well; Aerial part is provided with the portable pick-up unit 1 that the armouring complex line is connected with under ground portion, and this pick-up unit 1 is provided with the portion of pulling and control terminal; Signal acquisition part is attached in the portion of pulling, and in gas storage well bore, moves up and down at shaft in wall by centralizer 8, and what be connected with centralizer also has the annular immersion probe arrays of being made up of at least two layers of probe 9.4 is motor among the figure.
Centralizer 8 is provided with a plurality of supporting legs 82 that roll and contact with shaft in wall; Axial direction at centralizer is provided with spring 84.
The aforesaid portion of pulling comprises cylinder 2 and fixed pulley 5; Be provided with scrambler 10 before the cylinder 2.
Aforesaid signal Processing end is provided with AD conversion and data and image processing apparatus.
Old-fashioned gas storage well bore wall thickness and corrosion detection system and method are owing to instrument in the well is built on microcomputer, and computer operating system complicacy and instability make the instrument failure rate very high, to such an extent as to and as the optical cable of signal transmssion line and sub power source line from mode produced long apart from the time optical cable and power lead twine and can't separate the predicament interrupting detecting of having to.Moreover homemade optical fiber seal joint success ratio is lower and fragilely be not durable, must SC when the inconvenient reason that connects fast makes instrument work, make the dirigibility of detection system and operability be subjected to great restriction.
This improvement gas storage well bore wall thickness and corrosion detection system and method are at first simplified instrument complicacy and function in the well, allow its responsible simulating signal part, AD change, the function of data processing and analysis is all in aboveground computer realization.Two parts connect by the armouring complex line.Like this, signal transmission before two parts is a simulating signal, the signal frequency range is used supersonic range for detecting, and the noise of this frequency range is minimum in the gas storage well, so with analog signal transmission is fully feasible, having saved digital signal so again must scratch according to the tired of all faults that certain protocol code transmission is produced, simultaneously, simulation signal and power supply line all are electric signal, can be total to same multicore sealing adaptor, can realize easily again pegging graft, save the trouble of removing to connect the light signal joint again, lack a joint simultaneously and just gone the possibility of leaking less, the waterproof sealing of instrument in the well has been improved again greatly.In native system, the shared Malong of the armouring complex line head of service cable and the transmission of responsible signal reaches sealing and connection request.
In order to solve the problem that power lead separately and signal wire twine mutually, this improvement gas storage well bore wall thickness and corrosion detection system and method have been made the armouring complex line by oneself, its sectional view is as shown in Figure 3: armouring complex line 3 by in inside and outside three layers constitute, skin is that the steel wire internal layer is several copper conductors of mutually insulated, and the center is a concentric cable 31.Inner conductor 32 is instrument power supply in the well, and cover wire 33 mainly plays the interior instrument effect of suspension well and protects service cable line and concentric cable to be difficult for being damaged.The multiplexing concentric cable of analog signal time division of each probe of instrument is supplied with computing machine 6 in the well.
Fig. 4 is an armouring complex line cylinder synoptic diagram, and 4 is motor.
Aerial part mainly is the signal of instrument in the responsible received well and shows, and the degree of depth that detects the pit shaft position is measured.Because the requirement of needed movability of equipment itself and anti-environmental impact, industrial computer 6 is adopted in conversion of signal on the ground and demonstration.The overground installation well head partly has pulley 5, sheathed cable is entered in the well by pulley, in order to avoid well bore and cable wear and tear mutually, rotary encoder 10 is installed before cylinder 2 to be linked into homemade coding and to read circuit board, this circuit board is inserted on the notebook, then computing machine can accurately read the position of instrument in the well by rotary encoder 10, and the position of the gas storage well 11 that this detects just.
The ultrasonic emitting and the receiving circuit that transmit and receive the complete autonomous Design of lift-launch in the simple cycle system that designs based on FPGA of the ultrasonic signal of instrument in the well, the multiplexing armouring complex line supply of analog signal time division computing machine 6 processing and the demonstration of interior each probe of instrument of well.
The same with aging method, the annular immersion probe array 9 of this modified gas storage well bore wall thickness and corrosion detection system and method and centralizer 8 parts also in well instrument below, as shown in Figure 5.When reality is used, regulate 81 centralizer supporting leg 82 is opened, make 83 rollers touch the gas storage well inwall, as Fig. 2, Fig. 5, shown in Figure 6, wherein Fig. 5 has provided the two states of supporting leg opening and closing.
See also Fig. 5 and shown in Figure 6, two centralizers are arranged up and down, can guarantee the coaxial parallel of linear transducer array and gas storage well at linear transducer array.Roller on the supporting leg can also guarantee the easy on and off activity of down-hole part when supporting leg is closely contacted with inwall.For prevent that the centralizer supporting leg from blocking in well, elastomeric element 84 is installed in 8 centralizers, guarantee the coaxial parallel of instrument and pit shaft under the normal condition, and when the borehole wall has irregular raised points, can compress in right amount and do not cause instrumentation card in well.Two centralizer supporting legs are in the angle that upwards also staggers in week up and down, and the assurance of maximum possible annular immersion probe array 9 is real parallel with the borehole wall like this, obtains real available ultrasound echo signal.And double densely arranged annular linear transducer array 9 can make instrument just can finish detection to gas storage well in process from the bottom to top.
Owing to all can implement to detect in the process that gas storage well bore wall thickness and corrosion detection system instrument in well rises and descends to gas storage well, so two width of cloth wall thickness and the etch state image that can be risen and descend, because testing result is almost completely identical, so can select for use any width of cloth wall thickness and etch state image to estimate.
Claims (4)
1. modified gas storage well bore wall thickness and corrosion detection system comprise signal processing part on the ground and are arranged on underground signal transmitting and receiving portion in the gas storage well; Aerial part is provided with the portable pick-up unit that is connected with under ground portion by the armouring complex line, and this pick-up unit is provided with the portion of pulling and control terminal; It is characterized in that: the output terminal of armouring complex line standard coaxial cable is connected with the computing machine of aboveground signal processing part, several analog quantity probe signals that collect, finishes processing to Analog signals'digital conversion and data-signal by computing machine;
Described signal processing part is insinuated in the gas storage well bore by ground by pulling portion, moves up and down at shaft in wall by centralizer; The annular water logging analog quantity linear transducer array of forming by at least two layers of probe in addition that is connected with centralizer;
Described analog quantity is visited the corresponding FPGA program of first dust cycle, and described FPGA program Solidification is on circuit board;
Described armouring complex line is twined by concentric cable and power lead layering and makes the shared multicore WATERPROOF PACKING GLAND of concentric cable and power lead in outer winding steel wire.
2. modified gas storage well bore wall thickness according to claim 1 and corrosion detection system is characterized in that: described centralizer is provided with a plurality of supporting legs that roll and contact with shaft in wall; Axial direction at centralizer is provided with spring.
3. modified gas storage well bore wall thickness according to claim 1 and corrosion detection system is characterized in that: the described portion of pulling comprises cylinder and fixed pulley, on the cycloid before the cylinder scrambler of fixedlying connected with computing machine is arranged.
4. modified gas storage well bore wall thickness and corrosion detecting method is characterized in that may further comprise the steps:
Step 1, in gas storage well fills with water, at well head fixed pulley is installed, adjust the position of detector device car; Connect subsurface equipment and armouring complex line;
Step 2, open the subsurface equipment power switch, all linear transducer arrays excite and accept ultrasonic signal successively according to FPGA program setting order, and the probe signal timesharing enters the concentric cable in the armouring complex line;
Step 3, startup computing machine are placed underwater portion to well, regulate the centralizer part, and the centralizer supporting leg is just contacted with gas storage well; The assurance linear transducer array is coaxial parallel with gas storage well;
Step 4, oscilaltion instrument arrive suitable beginning detection position, start detection software;
Step 5, computing machine are obtained the probe signal of a complete cycle from the coaxial electrical cable-end;
The ownership of step 6, computer-made decision data, and in the belonging positions ultrasonic thickness measurement data of drawing, the real time data image shows at corresponding on-screen display (osd) area;
Step 7, judge whether to finish detection, as finish detection and then store data image or print data image; As not finishing detection, then turn back to step 4 by computer control;
The rise and fall of described probe work and instrument are carried out simultaneously;
Annular immersion probe array certain angle that on the circumferencial direction between the layer, staggers.
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| CN104473620A (en) * | 2014-12-24 | 2015-04-01 | 上海交通大学 | Device and method for multiplexing photoacoustic imaging signals |
| CN104713946A (en) * | 2015-04-01 | 2015-06-17 | 无锡昌纳德检测科技有限公司 | Nondestructive testing device for compressed natural gas storage well |
| CN107299833A (en) * | 2017-07-06 | 2017-10-27 | 中国石油大学(北京) | A kind of Casing Detection leak source apparatus and method |
| CN108825206A (en) * | 2018-06-12 | 2018-11-16 | 江苏省特种设备安全监督检验研究院 | Gas storage well detection wellhead cable deviator and detection method |
| CN108825206B (en) * | 2018-06-12 | 2023-11-14 | 江苏省特种设备安全监督检验研究院 | Wellhead cable steering device for gas storage well detection and detection method |
| CN109613115A (en) * | 2018-12-14 | 2019-04-12 | 中国特种设备检测研究院 | The sound wave detecting method that the bonding quality of gas storage well cement protective layer is detected |
| CN109613115B (en) * | 2018-12-14 | 2021-02-02 | 中国特种设备检测研究院 | Acoustic detection method for detecting cementing quality of cement protective layer of gas storage well |
| CN110243838A (en) * | 2019-07-11 | 2019-09-17 | 浙江省特种设备科学研究院 | A kind of ultrahigh pressure vessel detection device and its detection method |
| CN111964602A (en) * | 2020-08-17 | 2020-11-20 | 安徽省特种设备检测院 | Method for detecting deformation of small-diameter underground gas storage well shaft |
| CN115288668A (en) * | 2022-07-27 | 2022-11-04 | 重庆大学 | Wellbore leakage simulation displacement loading device |
| CN115288668B (en) * | 2022-07-27 | 2024-05-31 | 重庆大学 | Shaft leakage simulation displacement loading device |
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Application publication date: 20110525 |