CN105840178A - On-line monitoring system and method for dissolution cavity of salt cavern storage - Google Patents
On-line monitoring system and method for dissolution cavity of salt cavern storage Download PDFInfo
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- CN105840178A CN105840178A CN201610227701.8A CN201610227701A CN105840178A CN 105840178 A CN105840178 A CN 105840178A CN 201610227701 A CN201610227701 A CN 201610227701A CN 105840178 A CN105840178 A CN 105840178A
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- 150000003839 salts Chemical class 0.000 title claims abstract description 38
- 238000012544 monitoring process Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000004090 dissolution Methods 0.000 title abstract description 5
- 239000000523 sample Substances 0.000 claims abstract description 24
- 239000003990 capacitor Substances 0.000 claims abstract description 5
- 230000008569 process Effects 0.000 claims abstract description 4
- 238000005259 measurement Methods 0.000 claims description 42
- 238000006243 chemical reaction Methods 0.000 claims description 23
- 238000007790 scraping Methods 0.000 claims description 17
- 238000007689 inspection Methods 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000004891 communication Methods 0.000 claims description 8
- 239000010802 sludge Substances 0.000 claims description 7
- 238000004458 analytical method Methods 0.000 claims description 6
- 230000009286 beneficial effect Effects 0.000 claims description 6
- 230000036541 health Effects 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 4
- 239000003086 colorant Substances 0.000 claims description 3
- 239000002283 diesel fuel Substances 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 230000003321 amplification Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 claims 1
- 238000003199 nucleic acid amplification method Methods 0.000 claims 1
- 230000008859 change Effects 0.000 abstract description 6
- 238000011161 development Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 230000033558 biomineral tissue development Effects 0.000 abstract 1
- 239000012267 brine Substances 0.000 abstract 1
- 238000001514 detection method Methods 0.000 abstract 1
- 230000018109 developmental process Effects 0.000 abstract 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 241000208340 Araliaceae Species 0.000 description 2
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 2
- 235000003140 Panax quinquefolius Nutrition 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000013505 freshwater Substances 0.000 description 2
- 235000008434 ginseng Nutrition 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000000844 transformation Methods 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009414 blockwork Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
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- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Geophysics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Remote Sensing (AREA)
- Geophysics And Detection Of Objects (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The invention provides an on-line monitoring system and method for a dissolution cavity of a salt cavern storage. The device comprises a ground unit and an underground unit, a super-large scale programmable logic device and an embedded soft-core microprocessor are adopted, an underground instrument is highly integrated, meanwhile, a probe type sensor is adopted, the bottleneck of narrow space is overcome, the problem of placement of a measuring device in a small well hole annulus is solved, the development of the dissolution cavity process is promoted to a large extent, a group of probes with different lengths are set for the device, the dielectric constant of brine where the probes are located is dynamically detected according to the fixed parameter length among capacitor plates, automatic scaling of a capacitive sensor in the dissolution cavity monitoring process is realized, the effect of dielectric constant change caused by mineralization degree change in a traditional capacitive detection method on measuring results is eliminated, and the misjudgment problem of cavity top plate forms is solved effectively.
Description
Technical field
The present invention relates to a kind of bank molten chamber, salt cave monitoring method and device, online during particularly relating to molten chamber
Monitor molten chamber ceiling height.
Background technology
Salt cavern underground storage is to utilize water-soluble mode to form cave in subterraneous salt deposit or salt dome, for storing natural
A kind of underground installation of the medium such as gas, crude oil.Compared with traditional above-ground storage tank, salt cavern underground storage is because having
Deposit scale is big, safety is high and takes up an area the advantages such as few.Therefore, it becomes the excellent of oil reserve construction of base
Select save scheme.It is the longest in the bank building course of salt cave, that technology is the most complicated one for making chamber engineering
Technology.The problem that it includes two cores: one is how to build a stable cavity geometry；How two be
Improve salt cave and make chamber speed.For how building stable cavity geometry, comprise again two crucial technology: one
Being cavity geometry design, two is to make the control of cavity form during chamber.In cavity course of dissolution, due to weight
Power differentiation, causes longitudinal top salt deposit to dissolve relatively fast, and horizontal salt deposit dissolves relatively slow, if do not adopted
Taking control measure, salt deposit top will quickly be dissolved, thus, it is unsatisfactory for the form required by bank.
The purpose of Project Realization is, detects cavity ceiling location during molten chamber, obtains a reflection
The real-time curve of cavity ceiling height.Utilize salt deposit not dissolve in oil but be dissolved in the characteristic of water, cavity adds bavin
Oil as interleaving agent, cuts off cavity top salt deposit directly and fresh water into contact.Therefore, by making bavin during chamber
Oil and the interfacial on-line checking of fresh water, it is achieved the protection of cavity top board, thus control to make the form of chamber cavity.
Owing to salt cavern underground storage often build about 1000 meters, underground in, make chamber long construction period, wellhole annular space of constructing
Space is little, and supervising device need to place 2-3 in wellhole, and oil-water interfaces fluctuation range reaches the practical situations such as tens of rice,
The oil-water interfaces measuring method used in above-ground storage tank, as float-ball type, differential pressure type, short-wave absorption formula, radio frequency are led
Formula etc. of receiving does not adapts to molten chamber working environment.It addition, during the molten chamber in salt cave, along with entering of molten chamber process
OK, environment changes, and as in salt, the concentration of salt incrementally increases, salinity can become big, and dielectric constant can become
Little.
Summary of the invention
In order to overcome the deficiencies in the prior art, the present invention provides a kind of salt cave bank molten chamber on-line monitoring method and dress
Put, which solve the full-automatic process during the molten chamber of bank, on-line checking, real-time Transmission and automatic scale
Etc. problem, it is achieved accurately measuring and monitoring in real time of cavity ceiling height, thus control the top profile of cavity.
The technical solution adopted in the present invention is:
A kind of online monitoring system towards the molten chamber of bank, salt cave, including surface units and downhole unit, ground is single
Unit is connected by cable reel, assembly pulley and 7 core cables with downhole unit, 1# and 4# in described 7 core cables
Cable core is responsible for power supply, the measurement that 2# and 5# cable core is responsible for transmitting the order that issues of surface units and downhole unit is uploaded
Data, remaining cable core is vacant, cable sheath ground connection；Described downhole unit includes:
Downhole controller, the order issued for Decoding Analysis surface units also controls each mould in downhole unit with this
Block works, simultaneously the analyzing and processing molten intracavity status information that collects of downhole unit performing the encoding operation；
Mode conversion module, for the self-inspection according to control command conversion downhole unit or two kinds of Working moulds of measurement
Formula；
Measure and conversion module, be used for measuring capacitance and capacitance being converted into frequency；
Sensor group, including a pressure transducer, a temperature sensor and a tri-electrode capacitance sensor；
Pressure transducer, temperature sensor all electrically connect with downhole controller, for monitoring the pressure and temperature of molten intracavity；
Tri-electrode capacitance sensor passes sequentially through mode conversion module, measurement and conversion module and is electrically connected with downhole controller
Connect, be used for monitoring oil-water interfaces height；
Down-hole graceful code modulate circuit, electrically connects with downhole controller, by transformator, differential amplifier, hysteresis ratio
Relatively device and mu balanced circuit composition, the down-hole status information after unit earthward sends downhole controller coding,
And up-delivering signal is nursed one's health, make signal be beneficial on cable and transmit, overcome the cable capacitive reactance impact on signal.
As preferably, described tri-electrode capacitance sensor is probe sensor, and its three capacitor plates are set to
Two length one are short, by the capacitance diversity judgement oil-water interfaces height between three pole plates.
As preferably, described downhole unit also includes two groups of apparatus for eliminating sludge, one group of correspondence tri-electrode capacitance sensor
Two long pole plates, the short pole plate of another set correspondence tri-electrode capacitance sensor, described apparatus for eliminating sludge include step
Enter push rod that motor is connected with stepping motor rotating shaft and the scale removal being arranged on tri-electrode capacitance sensor pole plate is scraped
Sheet, described motor electrically connects with downhole controller, processor control motor work, pass through push rod
Drive scale removal scraping blade that pole plate is carried out scaling operation.
As preferably, described surface units includes:
Ground controller, the ceiling height uploaded for Decoding Analysis downhole unit, temperature, pressure information are concurrent
Give remote computer, receive remote computer and instruct and encode；Control each module of surface units complete simultaneously
Become corresponding function；
Ground graceful code modulate circuit, electrically connects with ground controller, by transformator, differential amplifier, hysteresis ratio
Relatively device and mu balanced circuit composition, the control the issued life after sending ground controller coding to downhole unit
Order, and signal is nursed one's health, make signal be beneficial on cable and transmit, overcome the impact of cable capacitive reactance；
Depth measuring module, electrically connects with ground controller, for phase judgment and the degree of depth of degree of depth pulse signal
The counting of pulse, ground controller calculates the ID value of downhole instrument after reading counted number of pulses；
Wireless communication module, electrically connects with ground controller, is used for realizing surface units and remote control service device
Information mutual；
Display module, electrically connects with ground controller, for display command, the ID of downhole instrument, chamber
The information such as the position measuring height, temperature, pressure and push rod at body top board interface, can also be conveniently simultaneously
The debugging of system；
Alarm module, electrically connects with ground controller, including audible alarm and light warning, is used for reminding cavity
The upper limit of top board interface level measurement or lower limit.
As preferably, described alarm module includes audible alarm and the light warning of 2 kinds of colors of 2 kinds of frequencies, high
The sound of frequency and red light represent that cavity top board interface has exceeded the upper limit measured, low-frequency sound and Huang
Colored lights represents that cavity top board interface has exceeded the lower limit measured.
As preferably, described ground controller and downhole controller select G3CX type FPGA of Cyclone V series
Chip, uses embedded Nios II soft processor.
A kind of on-line monitoring method towards the molten chamber of bank, salt cave, comprises the following steps:
Step 1, arranges cable reel, mobile downhole unit, makes tri-electrode capacitance sensor be totally immersed into diesel oil
In；
Step 2, starts surface units, issues downhole unit self-inspection or measuring command by ground controller,
And by ground graceful code modulate circuit, control command is encoded；
Step 3, downhole controller receives and decodes, by down-hole graceful code modulate circuit, the self-inspection that surface units issues
Or measuring command, fixed capacity or tri-electrode capacitance sensor are accessed circuit by control model modular converter, with
Time gather molten cavity temperature, pressure and scale removal scraping blade positional information；
Step 4, based on equally accurate measuring frequency principle, downhole unit carries out frequency or period measurement to input signal,
Frequency or the cycle data of measurement are carried out Manchester's code and upload；
Step 5, the ground controller frequency to uploading or cycle data are decoded, and calculate the height at interface
Degree, shows on LCD in real time by measurement data, simultaneously by measurement result by the incoming calculating of wireless communication module
Machine.
As preferably, described step 4 also includes that downhole controller passes through temperature sensor and pressure transducer collection
The temperature value of the molten intracavity in down-hole and force value, and upload after encoding.
As preferably, the command frame format that in step 2, surface units sends to downhole unit is by command header, order
Control word, order tail form；The Frame that in step 4, downhole unit unit earthward sends is except including measuring
The frequency that arrives or outside the cycle, also includes temperature value, force value and the positional information of scale removal scraping blade.
As preferably, in step 3, fixed capacity is accessed circuit and carries out System self-test by mode conversion module, uses
In determining that system mode is the most normal；Tri-electrode capacitance sensor access circuit is carried out profit by mode conversion module
Interface level measurement pattern, according to different relative to position of tri-electrode capacitance sensor and oil-water interfaces, the difference of electric capacity,
Multivibrator is utilized to realize the electric capacity conversion to frequency.
Compared with prior art, the invention have the advantages that
The present invention is to work full-automation sides the most such as the top board interface during on-the-spot molten chamber, cavity morphometries
Formula instead of, and saves substantial amounts of cost of labor to the work of molten chamber；Device uses ultra-large programmable logic device
Part and embedded soft core microprocessor, make downhole instrument highly integrated, use probe sensor simultaneously, overcome
The bottleneck of narrow space, solves the problem placing measurement apparatus at The Small Well orifice ring in the air, to a great extent
Advance the development of molten chamber technique；Device uses the mode of data encoding, makes downhole instrument and ground instrument realize
Reliable long-distance transmissions, fundamentally solves ground and monitors the state in the molten chamber of underground salt cave in real time, it is achieved
Real time and on line monitoring；Device, by setting the probe of one group of Length discrepancy, utilizes ginseng fixing between capacitor plate
Examine length, dynamically detect the dielectric constant of salt residing for probe, it is achieved that during the monitoring of molten chamber, electric capacity is passed
The automatic scale of sensor, eliminates traditional capacitance determining method because salinity change causes change in dielectric constant
Impact on measurement result, efficiently solves the erroneous judgement problem of cavity top board form；Device be provided with self-inspection and
Measure 2 kinds of mode of operations, by self-inspection mode of operation, the duty of package unit can be carried out on ground
Monitoring, improves the reliability of device；Device is provided with scale removal scraping blade, the scale removal instruction issued according to ground,
Under the control of motor, probe can be carried out automatic desludging, eliminate probe and be in salt the hidden of raw dirt for a long time
Suffer from, it is ensured that the sensitivity that probe is long-term；By arranging, device, when measuring mode of operation, uses equally accurate to survey
Frequently principle, solves the problem that in tradition Measuring Frequency Method, measurement error is relevant with measured signal frequency；Device uses nothing
The method of line network service and serial data communication is connected with host computer, makes the data of device in-site measurement pass in real time
To background server, meet the demand of digital oil field development to a great extent.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention.
The surface units design principle block diagram that Fig. 2 provides for the embodiment of the present invention.
Fig. 3 is the downhole unit design principle block diagram that the embodiment of the present invention provides.
Fig. 4 is the on-line monitoring method flow diagram that the embodiment of the present invention provides.
Shown in figure: 1. surface units, 2. downhole unit, 3. cable reel, 4. assembly pulley, 11. ground
Controller, 12. ground graceful code modulate circuits, 13. depth measuring module, 14. wireless communication modules, 15. show
Showing module, 16. alarm modules, 21. downhole controllers, 22. mode conversion module, 23. measure and conversion
Module, 24. sensor groups, 25. down-hole graceful code modulate circuits, 26. apparatus for eliminating sludge, 241. pressure sensings
Device, 242. temperature sensors, 243. tri-electrode capacitance sensors
Detailed description of the invention
Understandable in order to enable the above-mentioned purpose of the present invention, feature and advantage to become apparent from, the most right
The detailed description of the invention of the present invention is described in detail.
Seeing Fig. 1, this figure is a kind of on-line monitoring system towards the molten chamber of bank, salt cave that the embodiment of the present invention provides
System, including surface units 1 and downhole unit 2, surface units 1 and downhole unit 2 are by cable reel 3, pulley
Group 4 and 7 core cables connect, and in described 7 core cables, 1# and 4# cable core is responsible for power supply, 2# and 5# cable core is responsible for
Transmitting the order that issues of surface units 1 and measurement data that downhole unit 2 is uploaded, remaining cable core is vacant, outside cable
Bark graft ground；The instruction that ground issues mainly has self-checking command, measurement instruction and scale removal instruction, the number that down-hole is uploaded
According to information such as the positions specifically including that ceiling height, pressure, temperature and scale removal scraping blade.
Ground instrument is to downhole instrument transmitting order to lower levels frame format:
| 0X5555 | Command control word | 0XAAAA |
Command frame format illustrates: 0X5555 represents that command header, 0XAAAA represent that order tail, middle order control
Word table shows the specific instructions that ground instrument sends to downhole instrument, and command control word is that 0X0701 represents downhole instrument
Doing self-test operations, command control word is that 0X0702 represents that downhole instrument does measurement operation, and command control word is
0X0703 represents that downhole instrument does scale removal and starts operation, and scale removal scraping blade moves down, and command control word is 0X0704
Representing that downhole instrument does scale removal and returns operation, scale removal scraping blade moves up.
Downhole instrument transmits data frame format earthward:
| 0X0707 | Temperature value | Force value | Ceiling height | Long push rod position | Short push rod position | 0XF0F0 |
Data frame format illustrates: 0X0707 represents that data head, 0XF0F0 represent data tail, intermediate data table respectively
Showing the temperature value of measurement, force value, ceiling height and long push rod position and short push rod position, temperature value is 16
Position, force value is 16, and ceiling height is the data bit of 2 32, the most corresponding count value Nx and Ns.Length pushes away
Bar position is 32, and short push rod is 32, the step number of the most corresponding micro-step motor.
Surface units 1, as in figure 2 it is shown, include: ground controller 11, selects the G3CX of Cyclone V series
Type fpga chip, use embedded Nios II soft processor ceiling height that Decoding Analysis downhole unit 2 is uploaded,
Temperature, pressure information are also sent to remote computer, receive remote computer and instruct and encode；Same time control
Surface units 1 modules processed completes corresponding function；Ground graceful code modulate circuit 12, with ground controller 11 electricity
Connect, be made up of transformator, differential amplifier, hysteresis loop comparator and mu balanced circuit, for downhole unit 2
Send the control command issued after ground controller 21 coding, and signal is nursed one's health, make signal be beneficial to
Transmit on cable, overcome the impact of cable capacitive reactance；Depth measuring module 13, electrically connects with ground controller 11,
For phase judgment and the counting of degree of depth pulse of degree of depth pulse signal, ground controller 11 reads counted number of pulses
After calculate the ID value of downhole instrument；Wireless communication module 14, electrically connects with ground controller 11, uses
Mutual with the information of remote control service device in realizing surface units 1；Display module 15, with ground controller 11
Electrical connection, for display command, the ID of downhole instrument, the measurement height at cavity top board interface, temperature,
The information such as the position of pressure and push rod, can also facilitate the debugging of system simultaneously；Alarm module 16, with ground
Controller 11 electrically connects, including audible alarm and the light warning of 2 kinds of colors of 2 kinds of frequencies, high-frequency sound
Representing that cavity top board interface has exceeded the upper limit measured with red light, low-frequency sound and yellow light represent
Cavity top board interface has exceeded the lower limit measured.
Described downhole unit 2, as it is shown on figure 3, include: downhole controller 21, downhole controller is selected equally
The G3CX type fpga chip of Cyclone V series, uses embedded Nios II soft processor to come Decoding Analysis ground single
First 1 order issued also controls modules work in downhole unit 2, simultaneously analyzing and processing downhole unit 2 with this
The molten intracavity status information that collects also performs the encoding operation；Mode conversion module 22, for according to control command
The self-inspection of conversion downhole unit 2 or two kinds of mode of operations of measurement；Measure and conversion module 23, be used for measuring electric capacity
Capacitance is also converted into frequency by value；Sensor group 24, passes including 241, temperature of a pressure transducer
Sensor 242 and a tri-electrode capacitance sensor 243；Pressure transducer 241, temperature sensor 242 are all and down-hole
Controller 21 electrically connects, for monitoring the pressure and temperature of molten intracavity；Tri-electrode capacitance sensor 243 is probe
Formula sensor, it is short, by the capacitance diversity judgement between three pole plates that its three capacitor plates are set to two length one
Oil-water interfaces height, tri-electrode capacitance sensor 243 passes sequentially through mode conversion module 22, measures and convert mould
Block 23 electrically connects with downhole controller 21；Down-hole graceful code modulate circuit 25, electrically connects with downhole controller 21, with
Ground graceful code modulate circuit is the same, is made up of transformator, differential amplifier, hysteresis loop comparator and mu balanced circuit,
Down-hole status information after unit 1 earthward sends downhole controller 21 coding, and up-delivering signal is carried out
Conditioning, makes signal be beneficial on cable and transmits, overcome the cable capacitive reactance impact on signal；
In addition downhole unit 2 also includes two groups of apparatus for eliminating sludge 26, the two of one group of correspondence tri-electrode capacitance sensor 243
Individual long pole plate, the short pole plate of another set correspondence tri-electrode capacitance sensor 243, described apparatus for eliminating sludge 26 includes
Push rod that motor is connected with stepping motor rotating shaft and being arranged on tri-electrode capacitance sensor 243 pole plate
Scale removal scraping blade, described motor electrically connects with downhole controller 21, processor control motor work,
Drive scale removal scraping blade that pole plate is carried out scaling operation by push rod.
Present invention additionally comprises a kind of on-line monitoring method towards the molten chamber of bank, salt cave using said system to realize,
As shown in Figure 4, comprise the following steps
Step 1, arranges cable reel, mobile downhole unit, makes tri-electrode capacitance sensor be totally immersed into diesel oil
In；
Step 2, starts surface units, issues downhole unit self-inspection or measuring command by ground controller,
And by ground graceful code modulate circuit, control command is encoded；
Step 3, downhole controller receives and decodes, by down-hole graceful code modulate circuit, the self-inspection that surface units issues
Or measuring command, fixed capacity or tri-electrode capacitance sensor are accessed circuit by control model modular converter, with
Time gather molten cavity temperature, pressure and scale removal scraping blade positional information；
Step 4, based on equally accurate measuring frequency principle, downhole unit carries out frequency or period measurement to input signal,
Frequency or the cycle data of measurement are carried out Manchester's code with the force value of molten intracavity together with temperature value
Upload；
Step 5, the ground controller frequency to uploading or cycle data are decoded, and calculate the height at interface
Degree, shows on LCD in real time by measurement data, simultaneously by measurement result by the incoming calculating of wireless communication module
Machine.
When performing self-test operations, downhole instrument one fixing electric capacity of access is to measuring circuit, through circuit transformations
After capacitance is changed into frequency values, carry out frequency measurement, upload data according to data output format instrument earthward,
The temperature value uploaded during Auto-Sensing Mode, force value, push rod position are all set as the value fixed, and these values are used for examining
In examining system, each equipment the most normally works.
When performing to measure operation, sensor probe accesses measuring circuit, the output signal reflection of sensor probe
The height of molten chamber top board, is converted into pulse signal by probe output signal after circuit transformations, is converted into pulse
The frequency of signal is corresponding to the height of molten chamber top board.The self-inspection of ceiling height and measurement share same conversion electricity
Road, according to the difference of order, downhole controller controls the break-make of relay, it is achieved self-inspection and the switching of measurement.
The measurement of pulse signals frequency uses equal precision measurement principle, and its step is that the output of Nios II processor synchronizes
Control signal, utilizes the rising edge of measured signal to go to trigger, produces synchronous counting and enable signal, and high level is effective,
This guarantees counting and enabling signal and hold time is the integral multiple in measured signal cycle.Enable signal at counting to have
Under conditions of effect, utilize the enumerator of 2 32 simultaneously to measured pulse counting and calibration pulse counting, set
Measured pulse count value Nx and calibration pulse count value Ns, Nios II processor reads count value Nx and Ns respectively.
Utilize formula fx=(Nx*fs)/Ns, obtain measured signal frequency fx, thus record the elevation information of molten chamber top board.
For the measurement of temperature, select thermal resistance temperature sensor, by direct-current bridge, temperature information is transformed into voltage
Signal, is acquired after amplifying filtering；For the measurement of pressure, select piezoresistance sensor, pass through direct current
Pressure information is transformed into voltage signal by electric bridge, is acquired after amplifying filtering.Utilize equally accurate frequency measurement side
Method, drastically increases the certainty of measurement of frequency, solves tradition Measuring Frequency Method medium frequency measurement error and tested letter
Number problem that frequency is relevant.Probe based on one group of Length discrepancy, utilizes ginseng fixing between long probe and short probe
Examine length, dynamically detect the dielectric constant in the salt of probe place, it is achieved that to probe during the monitoring of molten chamber
The automatic compensation of signal, eliminates traditional capacitance determining method because salinity change causes change in dielectric constant
Impact on measurement result, efficiently solves the erroneous judgement problem of cavity top board form.
When perform scale removal start to operate time, downhole controller according to the stroke of push rod, export 2 groups control pulses to
Micro-step motor, set of pulses correspondence long probe, one group of corresponding short probe, motor is rotated clockwise band
Dynamic push rod moves down, and push rod moves drive scale removal scraping blade and moves down.When performing scale removal and returning operation, well
Lower controller according to the stroke of push rod, export 2 groups control pulses to micro-step motor, set of pulses correspondence is long
Probe, one group of correspondence section probe, motor counterclockwise rotarily drives push rod and moves up, and push rod moves drive
Scale removal scraping blade moves up, and is regained by scale removal scraping blade.
The part not illustrated in description is prior art or common knowledge.The present embodiment is merely to illustrate this
Bright, rather than limit the scope of the present invention, the equivalent replacement etc. that those skilled in the art are done for the present invention
Amendment is all deemed to fall within this invention claims institute protection domain.
Claims (10)
1. towards the online monitoring system in the molten chamber of bank, salt cave, including surface units (1) and downhole unit (2),
Surface units (1) and downhole unit (2) are by cable reel (3), assembly pulley (4) and 7 cores
Cable connects, and in described 7 core cables, 1# and 4# cable core is responsible for power supply, 2# and 5# cable core is responsible for transmitting ground
Order that unit (1) issues and the measurement data that downhole unit (2) is uploaded, remaining cable core is vacant, electricity
Cable crust ground connection；It is characterized in that: described downhole unit (2) includes
Downhole controller (21), the order issued for Decoding Analysis surface units (1) also controls down-hole with this
In unit (2), the work of each module, analyzes and processes the molten intracavity status information that downhole unit (2) collects simultaneously
And perform the encoding operation；
Mode conversion module (22), for the self-inspection according to control command conversion downhole unit (2) or measurement two
Plant mode of operation；
Measure and conversion module (23), be used for measuring capacitance and capacitance being converted into frequency；
Sensor group (24), including a pressure transducer (241), a temperature sensor (242) and
Individual tri-electrode capacitance sensor (243)；Pressure transducer (241), temperature sensor (242) are all and down-hole
Controller (21) electrically connects, for monitoring the pressure and temperature of molten intracavity；Tri-electrode capacitance sensor (243)
Pass sequentially through mode conversion module (22), measurement and conversion module (23) to electrically connect with downhole controller (21),
For monitoring oil-water interfaces height；
Down-hole graceful code modulate circuit (25), electrically connects with downhole controller (21), by transformator, differential amplification
Device, hysteresis loop comparator and mu balanced circuit composition, send downhole controller (21) for unit (1) earthward
Down-hole status information after coding, and up-delivering signal is nursed one's health, make signal be beneficial on cable and transmit, gram
Take the cable capacitive reactance impact on signal.
A kind of online monitoring system towards the molten chamber of bank, salt cave, it is characterised in that:
Described tri-electrode capacitance sensor (243) is probe sensor, and its three capacitor plates are set to two
Length one is short, by the capacitance diversity judgement oil-water interfaces height between three pole plates.
A kind of online monitoring system towards the molten chamber of bank, salt cave, it is characterised in that:
Described downhole unit (2) also includes two groups of apparatus for eliminating sludge (26), one group of correspondence tri-electrode capacitance sensor
(243) two long pole plates, the short pole plate of another set correspondence tri-electrode capacitance sensor (243),
Described apparatus for eliminating sludge (26) includes push rod that motor is connected with stepping motor rotating shaft and is arranged on three
Scale removal scraping blade on plates capacitance sensor (243) pole plate, described motor and downhole controller (21)
Electrical connection, is controlled motor work by processor, drives scale removal scraping blade to remove pole plate by push rod
Dirt operation.
A kind of online monitoring system towards the molten chamber of bank, salt cave, it is characterised in that:
Described surface units (1) including:
Ground controller (11), the ceiling height uploaded for Decoding Analysis downhole unit (2), temperature, pressure
Force information is also sent to remote computer, receives remote computer and instructs and encode；Control ground single simultaneously
Unit's (1) each module completes corresponding function；
Ground graceful code modulate circuit (12), electrically connects with ground controller (11), by transformator, differential puts
Big device, hysteresis loop comparator and mu balanced circuit composition, for sending ground controller (21) to downhole unit (2)
The control command issued after coding, and signal is nursed one's health, make signal be beneficial on cable and transmit, overcome
The impact of cable capacitive reactance；
Depth measuring module (13), electrically connects with ground controller (11), for the phase of degree of depth pulse signal
Position differentiates and the counting of degree of depth pulse, and ground controller (11) calculates downhole instrument after reading counted number of pulses
ID value；
Wireless communication module (14), electrically connects with ground controller (11), is used for realizing surface units (1)
Mutual with the information of remote control service device；
Display module (15), electrically connect with ground controller (11), for display command, downhole instrument
ID, the information such as the position measuring height, temperature, pressure and push rod at cavity top board interface, simultaneously
The debugging of system can also be facilitated；
Alarm module (16), electrically connects with ground controller (11), including audible alarm and light warning,
For reminding the upper limit or the lower limit of cavity top board interface level measurement.
A kind of online monitoring system towards the molten chamber of bank, salt cave, it is characterised in that:
Described alarm module (16) includes audible alarm and the light warning of 2 kinds of colors, the altofrequency of 2 kinds of frequencies
Sound and red light represent cavity top board interface exceeded measure the upper limit, low-frequency sound and Huang
Colored lights represents that cavity top board interface has exceeded the lower limit measured.
A kind of online monitoring system towards the molten chamber of bank, salt cave, it is characterised in that:
Described ground controller (11) and downhole controller (21) select G3CX type FPGA of Cyclone V series
Chip, uses embedded Nios II soft processor.
7. the on-line monitoring method towards the molten chamber of bank, salt cave, it is characterised in that: comprise the following steps:
Step 1, arranges cable reel, mobile downhole unit, makes tri-electrode capacitance sensor be totally immersed into diesel oil
In；
Step 2, starts surface units, issues downhole unit self-inspection or measuring command by ground controller,
And by ground graceful code modulate circuit, control command is encoded；
Step 3, downhole controller receives and decodes, by down-hole graceful code modulate circuit, the self-inspection that surface units issues
Or measuring command, fixed capacity or tri-electrode capacitance sensor are accessed circuit by control model modular converter, with
Time gather molten cavity temperature, pressure and scale removal scraping blade positional information；
Step 4, based on equally accurate measuring frequency principle, downhole unit carries out frequency or period measurement to input signal,
Frequency or the cycle data of measurement are carried out Manchester's code and upload；
Step 5, the ground controller frequency to uploading or cycle data are decoded, and calculate the height at interface
Degree, shows on LCD in real time by measurement data, simultaneously by measurement result by the incoming calculating of wireless communication module
Machine.
A kind of on-line monitoring method towards the molten chamber of bank, salt cave the most according to claim 7, it is characterised in that:
Described step 4 also includes that downhole controller passes through molten intracavity under temperature sensor and pressure transducer production wells
Temperature value and force value, and upload after encoding.
9., according to a kind of on-line monitoring method towards the molten chamber of bank, salt cave described in claim 7 or 8, its feature exists
In: the command frame format that in step 2, surface units sends to downhole unit by command header, command control word,
Order tail forms；Frame that in step 4, downhole unit unit earthward sends is except including measuring
Frequency or outside the cycle, also includes temperature value, force value and the positional information of scale removal scraping blade.
A kind of on-line monitoring method towards the molten chamber of bank, salt cave the most according to claim 6, it is characterised in that:
In step 3, fixed capacity is accessed circuit and carries out System self-test by mode conversion module, is used for determining system
State is the most normal；Tri-electrode capacitance sensor access circuit is carried out oil-water interfaces survey by mode conversion module
Amount pattern, according to different relative to position of tri-electrode capacitance sensor and oil-water interfaces, the difference of electric capacity,
Multivibrator is utilized to realize the electric capacity conversion to frequency.
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