CN110345904A - Composition deformation and permeability test device and method are deposited during decomposition of hydrate - Google Patents
Composition deformation and permeability test device and method are deposited during decomposition of hydrate Download PDFInfo
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- CN110345904A CN110345904A CN201910488642.3A CN201910488642A CN110345904A CN 110345904 A CN110345904 A CN 110345904A CN 201910488642 A CN201910488642 A CN 201910488642A CN 110345904 A CN110345904 A CN 110345904A
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- 238000012360 testing method Methods 0.000 title claims abstract description 178
- 230000035699 permeability Effects 0.000 title claims abstract description 122
- 238000000034 method Methods 0.000 title claims abstract description 66
- 238000000354 decomposition reaction Methods 0.000 title claims abstract description 42
- 239000000203 mixture Substances 0.000 title claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 116
- 238000006243 chemical reaction Methods 0.000 claims abstract description 65
- 238000012544 monitoring process Methods 0.000 claims abstract description 40
- 230000008569 process Effects 0.000 claims abstract description 27
- 238000002591 computed tomography Methods 0.000 claims abstract description 21
- 239000012153 distilled water Substances 0.000 claims abstract description 14
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 claims description 30
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 28
- 238000002156 mixing Methods 0.000 claims description 27
- 230000008859 change Effects 0.000 claims description 14
- 239000002351 wastewater Substances 0.000 claims description 14
- 230000015572 biosynthetic process Effects 0.000 claims description 13
- 239000012528 membrane Substances 0.000 claims description 12
- 238000003786 synthesis reaction Methods 0.000 claims description 12
- 238000011144 upstream manufacturing Methods 0.000 claims description 11
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 10
- 238000010998 test method Methods 0.000 claims description 9
- 239000012530 fluid Substances 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 7
- 238000000151 deposition Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000005325 percolation Methods 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 claims description 3
- 230000036571 hydration Effects 0.000 claims description 3
- 238000006703 hydration reaction Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 230000002194 synthesizing effect Effects 0.000 claims description 3
- NUXZAAJDCYMILL-UHFFFAOYSA-K trichlorolanthanum;hydrate Chemical compound O.Cl[La](Cl)Cl NUXZAAJDCYMILL-UHFFFAOYSA-K 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims 1
- 238000009738 saturating Methods 0.000 claims 1
- 238000003860 storage Methods 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000009533 lab test Methods 0.000 abstract description 2
- 239000011148 porous material Substances 0.000 description 8
- 239000000243 solution Substances 0.000 description 6
- 238000011160 research Methods 0.000 description 5
- 230000008021 deposition Effects 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 150000004677 hydrates Chemical class 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011549 displacement method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000002000 scavenging effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010189 synthetic method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Fluid Mechanics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention provides composition deformation and permeability test device and method are deposited during a kind of decomposition of hydrate, it is related to laboratory test the field of test technology, including aqueous vapor supply system, reaction kettle, control pressurer system, permeability test macro, DEFORMATION MONITORING SYSTEM and CT scan system, aqueous vapor supply system is connected with reaction kettle, aqueous vapor supply system includes gas cylinder, distilled water tank, the first temperature control device for water bath and the second temperature control device for water bath, it provides gas source and control pressure, obtains air-water mixture；It is provided with axis pressure system and confining pressure system in reaction kettle, realizes triaxial stress load；Permeability test macro is connected with reaction kettle, for testing permeability；DEFORMATION MONITORING SYSTEM includes axial amount of deflection extensometer and circumferential amount of deflection extensometer, for monitoring test piece deformation；And the method tested using the device.It realizes the deformation of deposit and the test of permeability in hydrate decomposable process under condition of triaxial stress, easy to operate using the method for the device to test.
Description
Technical field
The present invention relates to laboratory test the field of test technology, the deformation of deposit during especially a kind of decomposition of hydrate
And permeability test device, and the method using the device to test.
Background technique
Methane hydrate is the new energy that a kind of reserves are high, energy density is big, has pole also referred to as " combustible ice "
High resource value is that oil and gas industry circle studies for a long period of time hot spot.But since there are phase transformations in methane hydrate recovery process
Journey, and methane hydrate deposits object rock core in situ obtains difficulty, and the research of methane hydrate Basic Physical Properties is made to face huge choose
War.
The basic ideas of methane hydrate exploitation are artificially to break its phase balance condition, make its decomposition, at present countries in the world
Pilot production method mainly has voltage drop method, heat injection method, gas displacement method, injecting inhibitor method and formation fluid extraction method etc..Permeability
It is an important parameter for assessing gas producing efficiency in hydrate recovery process, size reflects migration of the gas in porous media
Rate.Methane hydrate deposits object permeability is by the factors shadow such as hydrate mechanism, saturation degree, effective stress and water yield
It rings.Such as: in hydrate recovery process, hydrate concentration is gradually reduced, and increases sedimentary interstitial space, the power of sedimentary
Characteristic is learned to weaken；Effective stress changes with the decomposition of hydrate, and interstitial space is compressed under stress；Hydration
Water is produced in object decomposable process can make clay particle expansion etc..Therefore, porous media deposition in methane hydrate decomposable process is studied
Deformation and its permeability evolution rule of the object under triaxial stress effect, become in methane hydrate development process and realize hydrate
The important topic of controllable exploitation and Environmental security.
Currently, being directed to the evolution problem of methane hydrate deposits object permeability, researcher has carried out a series of grind
Study carefully, (107894383 A of Chinese patent CN) discloses permeability survey containing hydrate sediment under a kind of condition of triaxial stress and fill
It sets and its method, the measuring device includes reaction kettle, control pressurer system, hydrate concentration measuring system and permeability
Measuring system；(102445371 B of Chinese patent CN) disclose it is a kind of for hydrate sediment in-situ preparation and decompose and its
Permeability survey integrated apparatus, the device include a reaction kettle, freezer, scavenging leak detection system, temperature control system, gas supply system
System, water system, permeability measurement systems and computer data acquisition system.
Existing experimental rig can only measure the permeability under its triaxial stress, not be capable of measuring decomposition of hydrate not
With the axial direction and circumferential deformation of deposit test specimen after degree, and the situation of change of deposit internal pore structure can not be obtained.
Based on the needs for being influenced research by effective stress, pore structure on permeability, and the deficiency of existing experimental provision at present, to existing
Some experimental rigs are improved further.
Summary of the invention
In order to realize the deformation of deposit and permeability test in hydrate decomposable process under condition of triaxial stress, water is analyzed
Close object and decompose different degrees of deposit deformation and internal pore structure situation of change, so study permeability by stress and
The influence of pore structure provides and deposits composition deformation and permeability test device and method during a kind of decomposition of hydrate,
Specific technical solution is as follows.
A kind of decomposition of hydrate deposition composition deformation and permeability test device, including aqueous vapor supply system, reaction in the process
Kettle, control pressurer system, permeability test macro, DEFORMATION MONITORING SYSTEM and CT scan system；Aqueous vapor supply system and reaction kettle
It is connected, permeability test macro is connected with reaction kettle；DEFORMATION MONITORING SYSTEM includes that axial amount of deflection extensometer and circumferential amount of deflection are extended
Meter, CT scan system includes X source and X-ray receiving end；Aqueous vapor supply system includes gas cylinder, distilled water tank, the first water-bath temperature control
Device and the second temperature control device for water bath, gas cylinder and the first temperature control device for water bath are connected, distilled water tank and the second temperature control device for water bath
It is connected, the triple valve in the first temperature control device for water bath and the second temperature control device for water bath is connected；Axis pressure system is provided in reaction kettle
With confining pressure system, reaction kettle includes reaction kettle body, and control pressurer system includes upper piston cylinder and pedestal cylinder；Reaction kettle body
It is provided with air inlet on the upper piston cylinder on top, is provided with gas outlet on the pedestal cylinder of reaction kettle body lower part；Permeability is surveyed
Test system includes that counterbalance valve, back pressure container and gas and water separator, counterbalance valve are connected with gas outlet, back pressure container and gas-water separation
Device is connected with counterbalance valve respectively.
Preferably, it is provided with the first pressure reducing valve and the first air gauge at cylinder outlet, is set in the first temperature control device for water bath
It is equipped with coil pipe, the downstream of the first temperature control device for water bath is provided with the second valve and air pump.
It may further be preferable that being provided with third valve, the 4th valve, the 5th valve, in the second temperature control device for water bath
Two air gauges, triple valve, mixing wastewater with air container and water container are provided with constant-flux pump, constant-flux pump and third valve on distilled water tank
And the 4th pipeline between valve is connected；Third valve is connected with air water mixing vessel, and mixing wastewater with air container is connected with triple valve；
4th valve is connected with water container, and water container connects the 5th valve；Triple valve connects the pipe between the 5th valve and the 6th valve
Road, the second air gauge are arranged between triple valve and air water mixing vessel.
Preferably, reaction kettle further includes upper flange lid, lower flange lid, charging floor and pedestal, the upper end of upper piston cylinder
It is connected across upper flange lid with pressure head, reaction kettle is fixed on charging floor, is additionally provided with pedestal below charging floor；Test specimen is placed on
Between upper piston cylinder and pedestal cylinder, test specimen side is wrapped up by rubber membrane.
Preferably, permeability test macro further includes third air gauge, the 7th valve, electronic scale and gas collector,
Third pressure gauge is arranged on the pipeline between gas outlet and counterbalance valve, and the 7th valve is arranged in counterbalance valve and gas and water separator
Between pipeline on, gas and water separator is separately connected electronic scale and gas collector.
Preferably, DEFORMATION MONITORING SYSTEM further includes monitoring computer, circumferencial direction of the axial amount of deflection extensometer along test specimen
It is evenly arranged at least four, the upper and lower ends of axial amount of deflection extensometer are connected with extensometer top cover and extensometer pedestal respectively；It is circumferential
Amount of deflection extensometer is circumferentially fixed by screws on test specimen, at least arranges 4；Monitoring computer receives axial amount of deflection extensometer
With the deformation information of circumferential amount of deflection extensometer monitoring.
It may further be preferable that CT scan system further includes CT pattern process computer, X source and X-ray receiving end difference
The two sides of test specimen are arranged in, scanning information is transmitted to CT pattern process computer by X-ray receiving end.
Composition deformation and permeability test method are deposited during a kind of decomposition of hydrate, utilize above-mentioned a kind of hydrate point
Composition deformation is deposited in solution preocess and permeability test device is tested, and step includes:
Step 1: composition deformation and permeability test device are deposited during assembling decomposition of hydrate, and check device is airtight
Property；
Step 2: production deposit test specimen is simultaneously put into reaction kettle fixed, the axial amount of deflection extensometer of installation and circumferential amount of deflection
Extensometer simultaneously applies initial deflection；
Step 3: applying triaxial stress, first applies confining pressure by control pressurer system to setting value, then be gradually increased axis
Pressure；
Step 4: Control experiment temperature, while test specimen internal structure change is recorded by CT scan system；
Step 5: aqueous vapor supply system synthesizing methane hydrate is utilized；
Step 6: permeability test system and test permeability is utilized；
Step 7: the deposit permeability of decomposition of hydrate, adjustment counterbalance valve pressure to methane hydrate balance pressure are measured
Power decomposes hydrate hereinafter, opening the 7th valve, cools down after decomposition of hydrate, repeats step 6 using pulse attenuation method and measures water
Close the deposit permeability after object decomposes；
Step 8: calculation testing piece body strain, using axial amount of deflection is extended in hydrate decomposable process under condition of triaxial stress
The measured value of meter and circumferential amount of deflection extensometer, calculate the body strain of deposit test specimen: body strain=2 × hoop strain+axial direction is answered
Become.
It is also preferred that the method for lanthanum chloride hydrate specifically includes in step 5:
Method one: opening the 5th valve and the 6th valve, first pass through water container and fill the water into test specimen, then is injected by air pump
High pressure gas, adjusting counterbalance valve makes gas pressure be greater than the pressure that balances each other, when third pressure gauge and the 4th gage pressure not
When reducing again, the synthesis of methane hydrate is completed；
Method two: gas and water are mixed in mixing wastewater with air container, and triple valve and the 6th valve, mixing are opened after mixing
Object is passed through in test specimen by air inlet, and adjustment counterbalance valve pressure is greater than the balance pressure of methane hydrate, when third pressure gauge and
When 4th gage pressure no longer reduces, the synthesis of methane hydrate is completed.
It is still further preferred that the test of permeability includes test and the low-permeability of high permeability test specimen in step 6
The test of test specimen, specifically:
(1) when deposit permeability is greater than 10-16m2When, by gas constant pressure inject test specimen, adjust counterbalance valve pressure, when into
After port and the pressure remained steady of gas outlet, methane reaches steady seepage, records gas flow at this time, passes through Darcy's law
Calculate permeability K:
In formula: Q is flow of the fluid by the time in the unit time, cm3/s；U is the viscosity of fluid, Pas；A is examination
The sectional area of part, cm2；L is piece lengths, cm；△ P is third air gauge and the 4th barometric pressure difference, MPa；
(2) when hydrate concentration is high, the permeability of test specimen be will be greatly reduced, and be difficult to form stable percolation at this time；
The 6th valve is opened, setting high pressure is constant, after third pressure gauge and the 4th gage pressure value stabilization, closes the 6th
Valve opens the 7th valve, releases a small amount of gas, is then shut off the 7th valve, records third air gauge and the 4th barometric
The data pressure at two ends that pressure difference the changes over time data that gradually pressure difference changes over time in equilibrium process, calculate permeability k:
In formula: k-pulse attenuation method permeability, md；s1The slope of-ln (Δ P) and time t relationship fitting a straight line；μg—
Gas viscosity, Pas；L-test specimen length, cm；fz- real gas deviates perfect gas characteristic value；A-test specimen section
Product, cm2；Pm- test specimen two ends average pressure, Pa；V1- upstream building volume, cm3；V2- downstream building volume, cm3；VP- test specimen hole
Gap volume；θ-equationFirst positive number solution.
The beneficial effect comprise that
(1) the present invention provides composition deformation and permeability test device, the present apparatus are deposited during a kind of decomposition of hydrate
CT scan system is set, to facilitate the relationship of research deposit internal structure change and permeability；Aqueous vapor supply system provides
The structures and methods of different synthesized hydrates meet gas with various and form water so that flexible control system forms hydrate
Close the demand of object；There is axis pressure system and confining pressure system in reaction kettle and coat test specimen using rubber membrane, utilize special structure
It is loaded to realize, while being provided with DEFORMATION MONITORING SYSTEM in reaction kettle, so as to monitor the hoop strain and axial direction of test specimen
Strain；Permeability test macro, according to the structure setting of reaction kettle back pressure valve arrangement, to facilitate control pressure change, more
Easy measurement permeability.
(2) composition deformation and permeability test method, Ke Yigen are deposited during a kind of decomposition of hydrate provided by the invention
Different permeability test methods is selected according to the permeability size of deposit, when permeability is larger, reaches stable by measurement
Seepage flow situation under seepage state calculates permeability and tests permeability by pulse attenuation method when permeability is lower, thus
More accurately test the permeability of deposit；And the synthetic method of two kinds of hydrates is provided, it is distinctive using the device
Pipeline and device design, facilitate the synthesis of hydrate.
In addition device and method provided by the invention also has and facilitates control, applied widely, and measuring accuracy is high, test
The advantages that at low cost.
Detailed description of the invention
Fig. 1 is the composition schematic diagram of deposition composition deformation and permeability test device during decomposition of hydrate；
Fig. 2 is reaction kettle structural schematic diagram；
Fig. 3 is pulse attenuation method upstream and downstream gas pressure time history plot；
Fig. 4 is the curve graph that real gas deviates perfect gas characteristic value；
In figure: 1. gas cylinders；2. distilled water tank；3. the first air gauge；4. constant-flux pump；5. coil pipe；6. the first water-bath temperature control fills
It sets；7. air pump；8. mixing wastewater with air container；9. water container；10. the second air gauge；11. triple valve；12. the second water-bath temperature control fills
It sets；13.CT scanning means；14. third air gauge；15. the 4th air gauge；16. counterbalance valve；17. back pressure container；18. air water point
From device；19. electronic scale；20. gas collector；21.CT pattern process computer；22. monitoring computer；A1. the first decompression
Valve；A2. the second valve；A3. third valve；A4. the 4th valve；A5. the 5th valve；A6. the 6th valve；A7. the 7th valve；
V1. upstream chamber；V2. downstream chamber；23. test specimen；24. air inlet；25. upper piston cylinder；26. reaction kettle body；27. pedestal cylinder；
28. gas outlet；29. rubber membrane；30. axial amount of deflection extensometer；31. circumferential amount of deflection extensometer；32. extensometer pedestal；33. extending
Count top cover；34. charging floor；35. pedestal；36. outlet gas line；37.X light source；38.X optical receiving end.
Specific embodiment
In conjunction with shown in Fig. 1 to Fig. 4, a kind of decomposition of hydrate deposition composition deformation and permeability survey in the process provided by the invention
The specific embodiment for trying device and method is as follows.
Embodiment 1
It deposits composition deformation during a kind of decomposition of hydrate and permeability test device specifically includes aqueous vapor supply system, anti-
Answer kettle, control pressurer system, permeability test macro, DEFORMATION MONITORING SYSTEM and CT scan system.CT scan system is arranged in the present apparatus
System, to facilitate the relationship of research deposit internal structure change and permeability；Aqueous vapor supply system provides different synthesis
The structures and methods of hydrate meet the needs of gas with various forms hydrate so that flexible control system forms hydrate；Instead
It answers kettle to be provided with axis pressure chamber and confining pressure chamber, and coats test specimen using rubber membrane, realize load using special structure, while
DEFORMATION MONITORING SYSTEM is provided in reaction kettle, so as to monitor the hoop strain and axial strain of test specimen；Permeability test system
System, according to the structure setting of reaction kettle back pressure valve arrangement, thus facilitate control pressure change, easier measurement permeability.
Aqueous vapor supply system is connected with reaction kettle, the test specimen injection gas or water into reaction kettle, permeability test macro and
Reaction kettle is connected, for handling the gas for penetrating through test specimen 23.DEFORMATION MONITORING SYSTEM specifically includes axial amount of deflection extensometer 30
With circumferential amount of deflection extensometer 31, axial amount of deflection extensometer 30 is for monitoring axial deformation, and circumferential amount of deflection extensometer 31 is for supervising
The radial displacement of test block 23.CT scan system specifically includes X source 37 and X-ray receiving end 38, X source 37 and X-ray receiving end
38 are separately positioned on the two sides of reaction kettle, and X source 37 is scanned test specimen, and X-ray receiving end 38 receives and passes scanning information
Transport to CT pattern process computer 21.Aqueous vapor supply system includes gas cylinder 1, distilled water tank 2, the first temperature control device for water bath 6 and
Two temperature control device for water bath 12, gas cylinder 1 are connected with the first temperature control device for water bath 6,12 phase of distilled water tank 2 and the second temperature control device for water bath
Even, the first temperature control device for water bath 6 is connected with the triple valve 11 in the second temperature control device for water bath 12.Pressure control is provided in reaction kettle
System processed, wherein reaction kettle includes reaction kettle body 26, and control pressurer system includes upper piston cylinder 25 and pedestal cylinder 27.Reaction
It is provided with air inlet 24 on the upper piston cylinder 25 on 26 top of autoclave body, is provided with out on the pedestal cylinder 27 of 26 lower part of reaction kettle body
Port 28.Permeability test macro includes counterbalance valve 16, back pressure container 17 and gas and water separator 18, counterbalance valve 16 and gas outlet
28 are connected, and back pressure container 17 and gas and water separator 18 are connected with counterbalance valve 16 respectively.
1 exit of gas cylinder of aqueous vapor supply system is additionally provided with the first pressure reducing valve a1 and the first air gauge 3, the first water-bath control
It is provided with coil pipe 5 in warm device 6, for controlling temperature, it is gentle that the downstream of the first temperature control device for water bath 6 is provided with the second valve a2
Pump 7 facilitates and provides gas and increase pressure.Third valve a3, the 4th valve a4, are provided in second temperature control device for water bath 12
Five valve a5, the second air gauge 10, triple valve 11, mixing wastewater with air container 8 and water container 9 are provided with constant-flux pump on distilled water tank 2
4, the pipeline between constant-flux pump 4 and third valve a3 and the 4th valve a4 is connected.8 phase of third valve a3 and air water mixing vessel
Even, mixing wastewater with air container 8 is connected with triple valve 11, and mixing wastewater with air container 8 is for making gas hydrate.4th valve a4 and water
Container 9 is connected, and water container 9 connects the 5th valve a5.Triple valve 11 connects the pipeline between the 5th valve a5 and the 6th valve a6,
Second air gauge 10 is arranged between triple valve 11 and air water mixing vessel 8.Gas is realized by the cooperation of valve and pipeline
With the flexible control with water, and its temperature is controlled by temperature control device for water bath, utilizes air gauge real-time monitoring air pressure.
Reaction kettle further includes upper flange lid, lower flange lid, charging floor 34 and pedestal 35, and the upper end of upper piston cylinder 25 passes through
Upper flange lid is connected with pressure head, and reaction kettle body is fixed on charging floor 34, and pedestal 35 is additionally provided with below charging floor 34.Test specimen 23
It is placed between upper piston cylinder 25 and pedestal cylinder 27,23 side of test specimen is wrapped up by rubber membrane.There is axis pressure in reaction kettle
System and confining pressure system, kettle is interior to place test specimen, and axis presses system to apply axis pressure, and confining pressure system passes through hydraulic oil and applies confining pressure, reacts
The upper piston cylinder of kettle is downwardly applied to axial compressive force, while can change confining pressure, realizes triaxial stress load.
Permeability test macro further includes third air gauge 14, the 7th valve a7, electronic scale 19 and gas collector 20, and
Three pressure gauges 14 are arranged on the pipeline between gas outlet 28 and counterbalance valve 16, for monitoring the pressure of 28 position of gas outlet, the
Seven valve a7 are arranged on the pipeline between counterbalance valve 16 and gas and water separator 18.Gas and water separator 18 is separately connected electronics
Scale 19 and gas collector 20, for the air-water mixture that decomposition of hydrate generates after gas and water separator 18, water reaches electronics
Scale 19 is weighed, and gas collector 20 completes the collection to gas.
DEFORMATION MONITORING SYSTEM further includes monitoring computer 22, circumferencial direction uniform cloth of the axial amount of deflection extensometer 30 along test specimen
At least four is set, the upper and lower ends of axial amount of deflection extensometer 30 are connected with extensometer top cover and extensometer pedestal respectively, so as to
The axial deformation situation of accurate recording test specimen.Circumferential amount of deflection draw 31 stretch meter be circumferentially fixed by screws on test specimen 23, at least
Arrangement 4 records the circumferential deformation situation of test specimen 23.Monitoring computer 22 receives axial amount of deflection extensometer 30 and circumferential amount of deflection is drawn
Stretch the deformation information of 31 monitoring of meter.
CT scan system further includes CT pattern process computer 21, and X source 37 and X-ray receiving end 38 are arranged in test specimen
Scanning information is transmitted to CT pattern process computer 21 by 23 two sides, X-ray receiving end 38, and computer carries out threedimensional model weight
It builds, observable test specimen internal pore structure.
Composition deformation and permeability test method are deposited during a kind of decomposition of hydrate, utilize above-mentioned a kind of hydrate point
Composition deformation is deposited in solution preocess and permeability test device is tested, and step includes:
Step 1: composition deformation and permeability test device are deposited during assembling decomposition of hydrate, and check device is airtight
Property.
Step 2: production deposit test specimen is simultaneously put into reaction kettle fixed, the axial amount of deflection extensometer of installation and circumferential amount of deflection
Extensometer simultaneously applies initial deflection.
Step 3: applying triaxial stress, first applies confining pressure by control pressurer system to setting value, then be gradually increased axis
Pressure.
Step 4: Control experiment temperature, while test specimen internal structure change is recorded by CT scan system.
Step 5: aqueous vapor supply system synthesizing methane hydrate is utilized.
The method of lanthanum chloride hydrate specifically includes in this step:
Method one: the 5th valve and the 6th valve are opened, water container is first passed through and injects gauge water into test specimen, then pass through gas
Pump injection high pressure gas, adjusting counterbalance valve makes gas pressure be greater than vapor pressure, when third pressure gauge and the 4th pressure gauge pressure
When power no longer reduces, methane hydrate synthesis is finished.
Method two: gas and water are mixed in mixing wastewater with air container, and triple valve and the 6th valve, mixing are opened after mixing
Object is passed through in test specimen by air inlet, and adjustment counterbalance valve pressure is greater than the balance pressure of methane hydrate, when third pressure gauge and
When 4th gage pressure no longer reduces, methane hydrate synthesis is finished.
Step 6: permeability test system and test permeability is utilized.
The test of permeability includes the test and the test of hypotonic test specimen of hypertonic test specimen in this step, specifically:
(1) when deposit permeability is greater than 10-16m2When, by gas constant pressure inject test specimen, adjust counterbalance valve pressure, when into
After port and the pressure remained steady of gas outlet, methane reaches steady seepage, records gas flow at this time, passes through Darcy's law
Calculate permeability K:
In formula: Q is flow of the fluid by the time in the unit time, cm3/s；U is the viscosity of fluid, Pas；A is examination
The sectional area of part, cm2；L is piece lengths, cm；△ P is third air gauge and the 4th barometric pressure difference, MPa；
(2) when hydrate concentration is high, the permeability of test specimen be will be greatly reduced, and be difficult to form stable percolation at this time；
The 6th valve is opened, setting high pressure is constant, after third pressure gauge and the 4th gage pressure value stabilization, closes the 6th
Valve opens the 7th valve, releases a small amount of gas, is then shut off the 7th valve, records third air gauge and the 4th barometric
The data pressure at two ends that pressure difference the changes over time data that gradually pressure difference changes over time in equilibrium process, calculate permeability k:
In formula: k-pulse attenuation method permeability, md；s1The slope of-ln (Δ P) and time t relationship fitting a straight line；μg—
Gas viscosity, Pas；L-test specimen length, cm；fz- real gas deviates perfect gas characteristic value, takes by formula in Fig. 2
Value；A-test specimen sectional area, cm2；Pm- test specimen two ends average pressure, Pa；V1- upstream building volume, cm3；V2- downstream chamber body
Product, cm3；VP- test specimen pore volume；θ-equationFirst positive number solution.
Step 7: the deposit permeability of decomposition of hydrate, adjustment counterbalance valve pressure to methane hydrate balance pressure are measured
Power decomposes hydrate hereinafter, opening the 7th valve, cools down after decomposition of hydrate, repeats step 6 using pulse attenuation method and measures water
Close the deposit permeability after object decomposes；
Step 8: calculation testing piece body strain, using axial amount of deflection is extended in hydrate decomposable process under condition of triaxial stress
The measured value of meter and circumferential amount of deflection extensometer, calculate the body strain of deposit test specimen: body strain=2 × hoop strain+axial direction is answered
Become.
This method can select different permeability test methods according to the permeability size of deposit, when permeability is larger
When, pass through impulse attenuation when permeability is lower by measuring the seepage flow situation calculating permeability reached under steady seepage state
Method tests permeability, thus the more accurate permeability of test deposit；And provide the synthesis side of two kinds of hydrates
Method is designed using the distinctive pipeline of the device and device, facilitates the synthesis of hydrate.
Embodiment 2
It deposits composition deformation during a kind of decomposition of hydrate and permeability test device specifically includes aqueous vapor supply system, anti-
Answer kettle, control pressurer system, permeability test macro, DEFORMATION MONITORING SYSTEM and CT scan system.CT scan system is arranged in the present apparatus
System, to facilitate the relationship of research deposit internal structure change and permeability；Aqueous vapor supply system provides different synthesis
The structures and methods of hydrate meet the needs of gas with various forms hydrate so that flexible control system forms hydrate；Instead
Answering in kettle has axis pressure system and confining pressure system, and coats test specimen using rubber membrane, load is realized using special structure, together
When DEFORMATION MONITORING SYSTEM is provided in reaction kettle, so as to monitor the hoop strain and axial strain of test specimen；Permeability is surveyed
Test system, according to the structure setting of reaction kettle back pressure valve arrangement, thus facilitate control pressure change, easier measurement infiltration
Rate.
Aqueous vapor supply system is connected with reaction kettle, the test specimen injection gas or water into reaction kettle, permeability test macro and
Reaction kettle is connected, for handling the gas for penetrating through test specimen 23.DEFORMATION MONITORING SYSTEM specifically includes axial amount of deflection extensometer 30
With circumferential amount of deflection extensometer 31, axial amount of deflection extensometer 30 is for monitoring axial deformation, and circumferential amount of deflection extensometer 31 is for supervising
The radial displacement of test block 23.CT scan system specifically includes X source 37 and X-ray receiving end 38, X source 37 and X-ray receiving end
38 are separately positioned on the two sides of reaction kettle, and X source 37 is scanned test specimen, and X-ray receiving end 38 receives and passes scanning information
Transport to CT pattern process computer 21.Aqueous vapor supply system includes gas cylinder 1, distilled water tank 2, the first temperature control device for water bath 6 and
Two temperature control device for water bath 12, gas cylinder 1 are connected with the first temperature control device for water bath 6,12 phase of distilled water tank 2 and the second temperature control device for water bath
Even, the first temperature control device for water bath 6 is connected with the triple valve 11 in the second temperature control device for water bath 12.Pressure control is provided in reaction kettle
System processed, wherein reaction kettle includes reaction kettle body 26, and control pressurer system includes upper piston cylinder 25 and pedestal cylinder 27.Reaction
It is provided with air inlet 24 on the upper piston cylinder 25 on 26 top of autoclave body, is provided with out on the pedestal cylinder 27 of 26 lower part of reaction kettle body
Port 28.Permeability test macro includes counterbalance valve 16, back pressure container 17 and gas and water separator 18, counterbalance valve 16 and gas outlet
28 are connected, and back pressure container 17 and gas and water separator 18 are connected with counterbalance valve 16 respectively.
1 exit of gas cylinder of aqueous vapor supply system is additionally provided with the first pressure reducing valve a1 and the first air gauge 3, the first water-bath control
It is provided with coil pipe 5 in warm device 6, for controlling temperature, it is gentle that the downstream of the first temperature control device for water bath 6 is provided with the second valve a2
Pump 7 facilitates and provides gas and increase pressure.Third valve a3, the 4th valve a4, are provided in second temperature control device for water bath 12
Five valve a5, the second air gauge 10, triple valve 11, mixing wastewater with air container 8 and water container 9 are provided with constant-flux pump on distilled water tank 2
4, the pipeline between constant-flux pump 4 and third valve a3 and the 4th valve a4 is connected.8 phase of third valve a3 and air water mixing vessel
Even, mixing wastewater with air container 8 is connected with triple valve 11, and mixing wastewater with air container 8 is for making gas hydrate.4th valve a4 and water
Container 9 is connected, and water container 9 connects the 5th valve a5.Triple valve 11 connects the pipeline between the 5th valve a5 and the 6th valve a6,
Second air gauge 10 is arranged between triple valve 11 and air water mixing vessel 8.Gas is realized by the cooperation of valve and pipeline
It is controlled with bright and beautiful work, and its temperature is controlled by temperature control device for water bath, utilize air gauge real-time monitoring air pressure.
Reaction kettle further includes upper flange lid, lower flange lid, charging floor 34 and pedestal 35, and the upper end of upper piston cylinder 25 passes through
Upper flange lid is connected with pressure head, and reaction kettle body is fixed on charging floor 34, and pedestal 35 is additionally provided with below charging floor 34.Test specimen 23
It is placed between upper piston cylinder 25 and pedestal cylinder 27,23 side of test specimen is wrapped up by rubber membrane.There is axis pressure in reaction kettle
System and confining pressure system, kettle is interior to place test specimen, and axis presses system to apply axis pressure, and confining pressure system passes through hydraulic oil and applies confining pressure, reacts
The upper piston cylinder of kettle is downwardly applied to axial compressive force, while can change confining pressure, realizes triaxial stress load.In order to further
The calculating accuracy for guaranteeing gas hydrate volume, is respectively set upstream chamber V1 and downstream chamber V2 in the upper and lower ends of reaction kettle,
To the volume change situation and pressure changing of test specimen two ends during more easily monitoring test.
Permeability test macro further includes that third air gauge 14, the 4th pressure gauge 15, the 7th valve a7, electronic scale 19 are gentle
Body collector 20, third pressure gauge 14 are arranged on the pipeline between air inlet and upstream chamber, and the setting of the 4th pressure gauge 15 is going out
On pipeline between port 28 and counterbalance valve 16, for monitoring the pressure of 28 position of gas outlet, the 7th valve a7 is arranged in back pressure
On pipeline between valve 16 and gas and water separator 18.Gas and water separator 18 is separately connected electronic scale 19 and gas collector
20, after gas and water separator 18, water reaches electronic scale 19 and weighs gas hydrate, and gas collector 20 is completed to gas
The collection of body.
DEFORMATION MONITORING SYSTEM further includes monitoring computer 22, circumferencial direction uniform cloth of the axial amount of deflection extensometer 30 along test specimen
At least four is set, the upper and lower ends of axial amount of deflection extensometer 30 are connected with extensometer top cover and extensometer pedestal respectively, so as to
The axial deformation situation of accurate recording test specimen.Circumferential amount of deflection draw 31 stretch meter be circumferentially fixed by screws on test specimen 23, at least
Arrangement 4 records the circumferential deformation situation of test specimen 23.Monitoring computer 22 receives axial amount of deflection extensometer 30 and circumferential amount of deflection is drawn
Stretch the deformation information of 31 monitoring of meter.
CT scan system further includes CT pattern process computer 21, and X source 37 and X-ray receiving end 38 are arranged in test specimen
Scanning information is transmitted to CT pattern process computer 21 by 23 two sides, X-ray receiving end 38, and computer carries out threedimensional model weight
It builds, observable test specimen internal pore structure.
The present embodiment additionally provides permeability test method in a kind of methane hydrate decomposable process, comprising the following steps:
Step 1: deposit test specimen is put into reaction kettle, whole device air-tightness is checked；
Diameter 30mm is made using uniformly mixed quartz sand, the deposit test specimen of high 60mm is wrapped using rubber membrane
Test specimen and rubber membrane are put into reaction kettle body jointly, are connected respectively with upper piston cylinder, pedestal cylinder up and down by deposit test specimen
It connects.The 6th valve a6 is opened, the 7th valve is closed, 6MPa pressure is arranged in counterbalance valve, injects 5MPa methane gas using air pump, quiet
After setting 2h, third gas pressure gauge and the 4th gas gauge are observed, if pressure does not reduce, air-tightness is good.
Step 2: axial amount of deflection extensometer and circumferential amount of deflection extensometer apply initial deflection；
Extensometer top cover is moved down, axial amount of deflection extensometer deformation is made to reach 2mm, adjusts circumferential amount of deflection to test specimen direction
Extensometer top screw makes circumferential amount of deflection extensometer generate 2mm deformation.
Step 3: applying triaxial stress；
Apply confining pressure first by control pressurer system to 5MPa, confining pressure is transferred to test specimen, confined pressure steady by rubber membrane
Being moved down afterwards by upper piston cylinder makes test specimen axis pressure reach 7MPa.
Step 4: control experimental temperature；
Experimental system temperature is reduced to 1 DEG C by water-bath temperature-controlling system, opens CT scan system at this time；
Step 5: generating hydrate；
The 5th valve a5, the 6th valve a6 are opened, water container is first passed through and injects gauge water into deposit test specimen, then pass through
Air pump injects high pressure methane gas, and adjusting counterbalance valve makes gas pressure be greater than vapor pressure, band third pressure gauge and the 4th pressure
When power meter pressure no longer reduces, methane hydrate synthesis is finished.
Step 6: permeability is tested；
When hydrate concentration is higher, sample permeability is lower, is hardly formed stable percolation at this time, and pulse can be used and decline
Subtraction tests permeability.The 6th valve a6 is closed, the 7th valve a7 of lower part is opened, releases a small amount of gas, be then shut off the 7th
Valve a7, the record pressure at two ends data that gradually pressure difference changes over time in equilibrium process, calculates permeability using following formula.
In formula: k-pulse attenuation method permeability, md；s1The slope of-ln (Δ P) and time t relationship fitting a straight line；μg—
Gas viscosity, Pas；L-test specimen length, cm；fz- real gas deviates perfect gas characteristic value, takes by formula in Fig. 2
Value；A-test specimen sectional area, cm2；Pm- test specimen two ends average pressure, Pa；V1- upstream building volume, cm3；V2- downstream chamber body
Product, cm3；VP- test specimen pore volume；θ-equationFirst positive number solution.
Upstream chamber and the pressure changing of downstream chamber during test are as shown in figure 3, real gas deviates perfect gas
The value of characteristic value is determined according to the curve in Fig. 4.
Step 7: decomposition of hydrate；
It adjusts under counterbalance valve pressure to hydrate phase balance pressure, and opens the 7th valve a7 below counterbalance valve, hydration
Object starts to decompose, and when decomposition of hydrate to predetermined extent, reduces temperature, hydrate is made to reach phase balance condition again.It weighs at this time
The 6th pace pulse damped method is answered to measure deposit permeability after decomposition of hydrate.
Step 8: deposit deformation monitoring；
It is scratched by axial amount of deflection extensometer in hydrate decomposable process under DEFORMATION MONITORING SYSTEM record triaxial stress and circumferential direction
Extensometer deformation data is spent, the body strain of deposit test specimen, body strain=2 × hoop strain+axial strain are calculated.
Certainly, the above description is not a limitation of the present invention, and the present invention is also not limited to the example above, this technology neck
The variations, modifications, additions or substitutions that the technical staff in domain is made within the essential scope of the present invention also should belong to of the invention
Protection scope.
Claims (10)
1. depositing composition deformation and permeability test device during a kind of decomposition of hydrate, which is characterized in that supplied including aqueous vapor
System, reaction kettle, control pressurer system, permeability test macro, DEFORMATION MONITORING SYSTEM and CT scan system；
The aqueous vapor supply system is connected with reaction kettle, and permeability test macro is connected with reaction kettle；The DEFORMATION MONITORING SYSTEM
Including axial amount of deflection extensometer and circumferential amount of deflection extensometer, CT scan system includes X source and X-ray receiving end；
The aqueous vapor supply system includes gas cylinder, distilled water tank, the first temperature control device for water bath and the second temperature control device for water bath, described
Gas cylinder and the first temperature control device for water bath are connected, and the distilled water tank and the second temperature control device for water bath are connected, the first water-bath temperature control dress
It sets and is connected with the triple valve in the second temperature control device for water bath；
Control pressurer system is provided in the reaction kettle, wherein reaction kettle includes reaction kettle body, and control pressurer system includes upper
Piston cylinder and pedestal cylinder；Air inlet is provided on the upper piston cylinder on the reaction kettle body top, reaction kettle body lower part
Gas outlet is provided on pedestal cylinder；
The permeability test macro includes upstream chamber, downstream chamber, counterbalance valve, back pressure container and gas and water separator, it is described on
Trip room is connected with by third pressure gauge with test specimen, and counterbalance valve is connected with downstream chamber, back pressure container and gas and water separator difference
It is connected with counterbalance valve.
2. composition deformation and permeability test device are deposited during a kind of decomposition of hydrate according to claim 1, it is special
Sign is, the first pressure reducing valve and the first air gauge, setting in first temperature control device for water bath are provided at the cylinder outlet
There is coil pipe, the downstream of the first temperature control device for water bath is provided with the second valve and air pump.
3. composition deformation and permeability test device are deposited during a kind of decomposition of hydrate according to claim 2, it is special
Sign is, third valve, the 4th valve, the 5th valve, the second air gauge, threeway are provided in second temperature control device for water bath
Valve, mixing wastewater with air container and water container are provided with constant-flux pump, constant-flux pump and third valve and the 4th valve on the distilled water tank
Between pipeline be connected；The third valve is connected with air water mixing vessel, and mixing wastewater with air container is connected with triple valve；Described
Four valves are connected with water container, and water container connects the 5th valve；The triple valve connects between the 5th valve and the 6th valve
Pipeline, the second air gauge are arranged between triple valve and air water mixing vessel.
4. composition deformation and permeability test device are deposited during a kind of decomposition of hydrate according to claim 1, it is special
Sign is that the reaction kettle further includes upper flange lid, lower flange lid, charging floor and pedestal, and the upper end of the upper piston cylinder is worn
It crosses upper flange lid to connect with pressure head, reaction kettle is fixed on charging floor, is additionally provided with pedestal below charging floor；Test specimen is placed on
Between piston cylinder and pedestal cylinder, test specimen side is wrapped up by rubber membrane.
5. composition deformation and permeability test device are deposited during a kind of decomposition of hydrate according to claim 1, it is special
Sign is that the permeability test macro further includes that third air gauge, the 4th air gauge, the 7th valve, electronic scale and gas are received
Storage, the third pressure gauge are arranged on the pipeline between air inlet and upstream chamber, the setting of the 4th pressure gauge in gas outlet and
On pipeline between counterbalance valve, the 7th valve is arranged on the pipeline between counterbalance valve and gas and water separator, the air water point
Electronic scale and gas collector are separately connected from device.
6. composition deformation and permeability test device are deposited during a kind of decomposition of hydrate according to claim 1, it is special
Sign is that the DEFORMATION MONITORING SYSTEM further includes monitoring computer, and the axial direction amount of deflection extensometer is equal along the circumferencial direction of test specimen
The upper and lower ends of even arrangement at least four, axial amount of deflection extensometer are connected with extensometer top cover and extensometer pedestal respectively；Circumferential direction is scratched
Degree extensometer is circumferentially fixed by screws on test specimen, at least arranges 4；The monitoring computer receives axial amount of deflection and extends
The deformation information of meter and circumferential amount of deflection extensometer monitoring.
7. composition deformation and permeability test device are deposited during a kind of decomposition of hydrate according to claim 1, it is special
Sign is that the CT scan system further includes CT pattern process computer, and the X source and X-ray receiving end are arranged in examination
Scanning information is transmitted to CT pattern process computer by the two sides of part, X-ray receiving end.
8. depositing composition deformation and permeability test method during a kind of decomposition of hydrate, any one of claim 1 to 7 institute is utilized
Composition deformation is deposited during a kind of decomposition of hydrate stated and permeability test device is tested, which is characterized in that step packet
It includes:
Step 1: composition deformation and permeability test device, and check device air-tightness are deposited during assembling decomposition of hydrate；
Step 2: it is sealed outside production deposit test specimen test specimen using rubber membrane, and is put into reaction kettle and fixes, then installation axle
To amount of deflection extensometer and circumferential amount of deflection extensometer and apply initial deflection；
Step 3: applying triaxial stress, first applies confining pressure by control pressurer system to setting value, then be gradually increased axis pressure；
Step 4: Control experiment temperature, while test specimen internal structure change is recorded by CT scan system；
Step 5: aqueous vapor supply system synthesizing methane hydrate is utilized；
Step 6: permeability test system and test test specimen containing hydrate permeability is utilized；
Step 7: the deposit permeability after measurement decomposition of hydrate, adjustment counterbalance valve pressure to methane hydrate balance pressure
Hereinafter, opening the 7th valve decomposes hydrate, cool down after decomposition of hydrate, repeats step 6 and use pulse attenuation method measurement hydration
Deposit permeability after object decomposition；
Step 8: calculation testing piece body strain, using under condition of triaxial stress in hydrate decomposable process axial amount of deflection extensometer and
The measured value of circumferential amount of deflection extensometer calculates the body strain of deposit test specimen: body strain=2 × hoop strain+axial strain.
9. composition deformation and permeability test method are deposited during a kind of decomposition of hydrate according to claim 8, it is special
Sign is that the method for lanthanum chloride hydrate specifically includes in step 5:
Method one: the 5th valve and the 6th valve are opened, water container is first passed through and is filled the water into test specimen, then high pressure is injected by air pump
Gas, adjusting counterbalance valve makes gas pressure be greater than the pressure to balance each other, when third pressure gauge and the 4th gage pressure no longer drop
When low, the synthesis of methane hydrate is completed；
Method two: gas and water are mixed in mixing wastewater with air container, and triple valve and the 6th valve are opened after mixing, and mixture is logical
It crosses air inlet to be passed through in test specimen, adjustment counterbalance valve pressure is greater than the balance pressure of methane hydrate, when third pressure gauge and the 4th
When gage pressure no longer reduces, the synthesis of methane hydrate is completed.
10. composition deformation and permeability test method are deposited during a kind of decomposition of hydrate according to claim 9, it is special
Sign is, the test of permeability includes the test of high permeability test specimen and the test of low-permeability test specimen in step 6, specifically:
(1) when deposit permeability is greater than 10-16m2When, gas constant pressure is injected into test specimen, adjusts counterbalance valve pressure, when air inlet and
After the pressure remained steady of gas outlet, methane reaches steady seepage, records gas flow at this time, is calculated and is seeped by Darcy's law
Saturating rate K:
In formula: Q is flow of the fluid by the time in the unit time, cm3/s；U is the viscosity of fluid, Pas；A is cutting for test specimen
Area, cm2；L is piece lengths, cm；△ P is third air gauge and the 4th barometric pressure difference, MPa；
(2) when hydrate concentration is high, the permeability of test specimen be will be greatly reduced, and be difficult to form stable percolation at this time；
The 6th valve is opened, setting high pressure is constant, after third pressure gauge and the 4th gage pressure value stabilization, closes the 6th valve
Door opens the 7th valve, releases a small amount of gas, is then shut off the 7th valve, records third air gauge and the 4th barometric pressure
The data pressure at two ends that power difference the changes over time data that gradually pressure difference changes over time in equilibrium process, calculate permeability k:
In formula: k-pulse attenuation method permeability, md；s1The slope of-ln (Δ P) and time t relationship fitting a straight line；μg- gas
Viscosity, Pas；L-test specimen length, cm；fz- real gas deviates perfect gas characteristic value；A-test specimen sectional area,
cm2；Pm- test specimen two ends average pressure, Pa；V1- upstream building volume, cm3；V2- downstream building volume, cm3；VP- test specimen hole
Volume；θ-equationFirst positive number solution.
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| CN113008682A (en) * | 2021-02-07 | 2021-06-22 | 山东科技大学 | True triaxial hydraulic fracturing simulation test device and method for natural gas hydrate reservoir |
| CN113567322A (en) * | 2021-07-27 | 2021-10-29 | 安徽理工大学 | Test device and method for researching mechanical property of pore medium under water pressure |
| CN113567322B (en) * | 2021-07-27 | 2024-01-26 | 安徽理工大学 | Test device and method for researching mechanical properties of pore medium by water pressure |
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