CN113047828A - Visual simulation method for clay expansion and migration in pressure-reducing exploitation process of argillaceous powder sand mold hydrate - Google Patents
Visual simulation method for clay expansion and migration in pressure-reducing exploitation process of argillaceous powder sand mold hydrate Download PDFInfo
- Publication number
- CN113047828A CN113047828A CN202110213736.7A CN202110213736A CN113047828A CN 113047828 A CN113047828 A CN 113047828A CN 202110213736 A CN202110213736 A CN 202110213736A CN 113047828 A CN113047828 A CN 113047828A
- Authority
- CN
- China
- Prior art keywords
- way valve
- glass etching
- etching model
- clay
- iii
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000004927 clay Substances 0.000 title claims abstract description 80
- 230000000007 visual effect Effects 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 41
- 230000008569 process Effects 0.000 title claims abstract description 24
- 238000004088 simulation Methods 0.000 title claims abstract description 21
- 230000005012 migration Effects 0.000 title claims abstract description 18
- 238000013508 migration Methods 0.000 title claims abstract description 18
- 239000004576 sand Substances 0.000 title claims abstract description 16
- 239000000843 powder Substances 0.000 title claims abstract description 13
- 238000005530 etching Methods 0.000 claims abstract description 88
- 239000011521 glass Substances 0.000 claims abstract description 88
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000000725 suspension Substances 0.000 claims abstract description 29
- 239000011148 porous material Substances 0.000 claims abstract description 26
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 23
- 239000011780 sodium chloride Substances 0.000 claims abstract description 23
- 239000002245 particle Substances 0.000 claims abstract description 10
- 238000002791 soaking Methods 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims description 53
- 238000002347 injection Methods 0.000 claims description 39
- 239000007924 injection Substances 0.000 claims description 39
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 20
- 238000006243 chemical reaction Methods 0.000 claims description 19
- 238000001816 cooling Methods 0.000 claims description 19
- 239000007790 solid phase Substances 0.000 claims description 17
- 238000011084 recovery Methods 0.000 claims description 13
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 9
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- 239000008398 formation water Substances 0.000 claims description 6
- 150000004677 hydrates Chemical class 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000000354 decomposition reaction Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 230000004044 response Effects 0.000 claims description 3
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 230000006399 behavior Effects 0.000 abstract description 15
- 230000033228 biological regulation Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 33
- 238000005065 mining Methods 0.000 description 6
- 230000009471 action Effects 0.000 description 4
- 239000012267 brine Substances 0.000 description 4
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000013049 sediment Substances 0.000 description 3
- 238000012800 visualization Methods 0.000 description 3
- 230000006837 decompression Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 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 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
Images
Classifications
-
- 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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
The invention relates to a hydrate simulation experiment, in particular to a visual simulation method for clay expansion and migration in a depressurization exploitation process of a argillaceous powder sand mold hydrate. The method comprises the following steps: preparing clay suspension, soaking a glass etching model in saline water, injecting the clay suspension into the glass etching model, driving out clay particles which are not firmly attached to the surfaces of the pore passages of the glass etching model, soaking the glass etching model in the saline water again, and generating hydrate which is gradually decomposed. The method can effectively control the variation of the pore structure, and realize the visual observation of the behaviors such as clay expansion, migration and the like in the depressurization exploitation process of the hydrate, thereby clarifying the behavior evolution law of the clay and providing technical support for the regulation and control of the behavior of the clay in the actual depressurization exploitation process of the argillaceous powder sand mold hydrate.
Description
Technical Field
The invention relates to a hydrate simulation experiment, in particular to a visual simulation method for clay expansion and migration in a depressurization exploitation process of a argillaceous powder sand mold hydrate.
Background
The natural gas hydrate is regarded as the best alternative energy in the 21 st century, more than 90% of the natural gas hydrate is distributed in the argillaceous silty sand type reservoir stratum, the argillaceous silty sand type reservoir stratum has the characteristics of small porosity, low permeability, high clay content and the like, and the clay minerals are easy to hydrate, expand, disperse and move in the mining process, so that the seepage space in the pores of the reservoir stratum is reduced, and the permeability of the reservoir stratum is seriously reduced.
Aiming at the problem of reservoir damage caused by clay in the pressure reduction exploitation process of argillaceous silt type hydrate, the existing literature carries out a hydrate pressure reduction exploitation simulation experiment by using clay-containing sediments, and the fact that the volume expansion and particle migration of the clay really occur in the pressure reduction decomposition process of the hydrate, so that the permeability of the sediment is reduced. However, the final result of the swelling and/or migration of clay can only be obtained by means of the prior art means and research methods, and the behavior evolution process of clay, such as how clay particles swell and migrate in pores, how the swelled and migrated clay particles affect the hydrate decomposition and gas-water seepage, cannot be described at present.
In addition, the pore medium used for simulating the argillaceous powder sand mold reservoir at present is a natural core or an artificial filling core, and the pore structures among different cores are difficult to ensure to be completely consistent. Because the behaviors such as clay expansion, migration and the like have stronger dependence on the pore structure of the sediment, the difference of the pore structures among the rock cores inevitably has great influence on the behavior of the clay, thereby seriously interfering the accuracy of the research result.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a visual simulation method for clay expansion and migration in the depressurization mining process of argillaceous powder sand mold hydrate, which can effectively control the pore structure variable and realize the visual observation of the clay expansion and migration and other behaviors in the depressurization mining process of hydrate, thereby clarifying the evolution law of clay behavior and providing technical support for the regulation and control of the clay behavior in the actual depressurization mining process of argillaceous powder sand mold hydrate.
The technical scheme of the invention is as follows: a visual simulation method for clay expansion and migration in a depressurization exploitation process of a argillaceous powder sand mold hydrate comprises the following steps:
s1, preparing a clay suspension;
s2, washing a glass etching model of the visual simulation device:
the visual simulation device comprises an injection system, a visual reaction kettle, a glass etching model, a cooling circulating pump, an output system, a confining pressure control system, a back pressure control system and an image data acquisition system, wherein the glass etching model is positioned in the visual reaction kettle;
the injection system comprises a gas injection unit, a liquid injection unit and a six-way valve I, wherein the gas injection unit comprises a methane gas cylinder, a pressure reducing valve, a gas flowmeter and a one-way valve which are sequentially connected, the one-way valve is connected with the six-way valve I, the liquid injection unit comprises a constant flow pump, a six-way valve II, an intermediate container I, an intermediate container II and an intermediate container III, the constant flow pump, the intermediate container I, the intermediate container II and the intermediate container III are respectively connected with the six-way valve II, deionized water is contained in the intermediate container I, saline water is contained in the intermediate container II, clay suspension is contained in the intermediate container III and has a stirring function, outlets of the three intermediate containers are respectively connected with the six-way valve I, and the six-way valve I is also connected with;
the visual reaction kettle comprises a kettle body, the device comprises an upper top cover and a lower bottom cover, wherein visual windows are respectively arranged at the central positions of the upper top cover and the lower bottom cover, the upper top cover is fixedly connected with the top of a kettle body, the lower bottom cover is fixedly connected with the bottom of the kettle body, a hollow cavity is arranged at the center of the kettle body, an annular cavity is arranged in the wall of the kettle body, a circulating liquid inlet and a circulating liquid outlet are arranged on the kettle body, the circulating liquid inlet and the circulating liquid outlet are respectively connected with a cooling circulating pump, so that cooling circulating liquid circulates in the annular cavity of the kettle body, an opening I and an opening II are arranged at the upper top cover, the opening I is connected with a confining pressure control system, the opening II is connected with a temperature sensor, an opening III and an opening IV are arranged at the lower bottom cover, the opening III is connected with a six-way valve I, the opening IV is connected with a production system;
the output system comprises a six-way valve III, a pressure sensor II, a recovery tank, a solid-phase separator, a back pressure valve, a gas-liquid separator, a gas collecting bottle and a liquid collecting bottle, wherein the six-way valve III is respectively connected with an opening IV of a lower bottom cover, the recovery tank, an inlet of the solid-phase separator and the pressure sensor II;
the confining pressure control system comprises a confining pressure control pump and a three-way valve I, the confining pressure control pump is communicated with an opening I of the upper top cover through the three-way valve I, a pressure sensor III is connected to the three-way valve I, the back pressure control system comprises a back pressure control pump and a three-way valve II, the back pressure control pump is communicated with a pressure interface of a back pressure valve through the three-way valve II, and a pressure sensor IV is connected to the three-way valve II;
the image data acquisition system comprises a video microscope, a light source and a computer, wherein the video microscope is connected with the computer through a data transmission line, and the computer is also connected with a pressure sensor I, a pressure sensor II, a pressure sensor III, a pressure sensor IV and a temperature sensor through data line connections;
adjusting the six-way valve II and the six-way valve I to enable the advection pump, the intermediate container I and the opening III of the lower bottom cover to be communicated, adjusting the six-way valve III to enable the produced fluid of the glass etching model to flow into the recovery tank, injecting deionized water in the intermediate container I into the glass etching model, repeatedly washing the glass etching model, and completely discharging bubbles and residues in the glass etching model;
s3, a saline water soaking glass etching model:
adjusting the six-way valve I to communicate the constant flow pump, the intermediate container II and the opening III of the lower bottom cover, and injecting the saline water in the intermediate container II into the glass etching model to fully soak the glass etching model;
s4, injecting a clay suspension into the glass etching model:
adjusting the six-way valve II to enable the constant-flow pump, the intermediate container III and the opening III of the lower bottom cover to be communicated, injecting the clay suspension in the intermediate container III into the glass etching model, observing that the surface of a pore channel in the glass etching model adsorbs a layer of clay through a video microscope, closing the constant-flow pump, and stopping injecting the clay suspension;
s5, driving out the clay particles which are not firmly adhered to the surface of the pore channel of the glass etching model:
adjusting the six-way valve I to enable the gas injection unit to be communicated with the opening III of the lower bottom cover, sequentially opening the methane gas cylinder, the pressure reducing valve, the one-way valve and the gas flowmeter, injecting gas into the glass etching model, and driving out clay particles which are not firmly attached to the surface of the pore channel of the glass etching model;
s6, repeating S4 and S5, repeatedly injecting clay suspension and gas into the glass etching model, and stopping injecting the clay suspension and gas after observing that the content and distribution of clay on the surface of the pore channel tend to be stable through a video microscope;
s7, soaking the glass etching model again by using saline water;
s8, keeping saline water injection, adjusting a six-way valve III to enable an inlet of the solid phase separator to be communicated with an opening IV of a lower bottom cover, synchronously adjusting a back pressure control pump and a confining pressure control pump to enable back pressure and confining pressure to be gradually increased to preset pressure, keeping the back pressure smaller than the confining pressure by 1MPa all the time, and adjusting the temperature of a cooling circulating pump to be at a preset temperature;
s9, hydrate generation:
when the pressure values measured by the pressure sensor I and the pressure sensor II and the temperature value measured by the temperature sensor are stable, adjusting the six-way valve I to enable the gas injection unit and the liquid injection unit to be simultaneously communicated with the opening III of the lower bottom cover, injecting methane gas and saline water into the glass etching model according to the proportion, stopping injecting after gas-water seepage is stable, closing a valve for communicating the six-way valve I with the gas injection unit and the liquid injection unit, and closing a valve for communicating the six-way valve III with the recovery tank and the solid phase separator to enable the glass etching model to be kept closed, and statically waiting for generation of hydrates;
s10, when the generation and the stability of hydrates in the glass etching model are observed through a video microscope, adjusting a six-way valve III to enable an inlet of a solid phase separator to be communicated with an opening IV of a lower bottom cover, adjusting a back pressure control pump to enable the back pressure to be gradually reduced, adjusting a confining pressure control pump to enable the confining pressure to be synchronously reduced, and keeping the confining pressure higher than the back pressure by 1Mpa all the time;
s11, gradually decomposing the hydrate along with the reduction of the back pressure, observing the behavior response of clay in the decomposition process of the hydrate in real time by using a video microscope, and measuring the front and back pressures of the glass etching model in real time by using a pressure sensor I and a pressure sensor II.
In the invention, in step S1, saline water capable of replacing the formation water is prepared according to the ion species and the concentration of the formation water, then clay is added into the saline water, a magnetic stirrer is used for stirring for more than 30min to obtain a clay suspension initially, and then the clay suspension is subjected to ultrasonic dispersion for more than 1 h.
In step S8, the set pressure of the back pressure control pump is 7MPa, the set pressure of the confining pressure control pump is 8MPa, and the set temperature of the cooling circulation pump is-1 ℃.
The light source is positioned below the visual window II, and the video microscope is positioned above the visual window I.
The cooling circulating liquid can adopt ethylene glycol.
The invention has the beneficial effects that:
(1) by utilizing the adsorption characteristic of the clay and the strong interfacial tension between gas and water, a glass etching model with the surface of a pore channel uniformly adsorbing the clay can be obtained, so that a argillaceous silty sand type reservoir is simulated, the constant pore structure of the simulated reservoir is ensured, and the influence of the change of the pore structure on the behaviors of clay expansion, migration and the like is avoided;
(2) by utilizing visual research means, the whole process of clay expansion and migration in the depressurization mining process of the hydrate is intuitively displayed, and the real-time observation of the behaviors such as clay expansion and migration is realized, so that the evolution rules of the behaviors such as clay expansion and migration are clearly revealed, and scientific guidance is provided for the effective regulation and control of the clay behavior in the depressurization mining process of the argillaceous powder sand mold hydrate.
Drawings
FIG. 1 is a schematic diagram of a visual simulation apparatus;
FIG. 2 is a schematic diagram of a top view of a visual reaction vessel;
FIG. 3 is a schematic sectional structure view of a visual reaction vessel.
In the figure: 1, a constant-flow pump; 2, a six-way valve II; 3 an intermediate container I; 4 an intermediate container II; 5 an intermediate container III; 6 a methane cylinder; 7 a pressure reducing valve; 8, a gas flow meter; 9 a one-way valve; 10 a six-way valve I; 11 a pressure sensor I; 12 visual reaction kettle; 12-1 kettle body; 12-2, a top cover is arranged; 12-3 visual window I; 12-4 of nuts; 12-5 opening I; 12-6 opening II; 12-7 circulating liquid inlets; 12-8 circulating liquid outlets; 12-9, arranging a bottom cover; 12-10 opening III; 12-11 visual window II; 12-12 opening IV; 13, etching a glass model; 14 six-way valve III; 15 cooling circulation pump; 16 confining pressure control pumps; 17 a three-way valve I; 18 a solid phase separator; 19 a back pressure valve; 20 a back pressure control pump; 21 a three-way valve II; 22 a gas-liquid separator; 23 liquid collecting bottles; 24 gas collection bottles; 25 video microscope; 26 a computer; 27 a temperature sensor; 28 pressure sensor II; 29 pressure sensor III; 30 a pressure sensor IV; 31 a recovery tank.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, specific details are set forth in order to provide a thorough understanding of the present invention. The invention can be implemented in a number of ways different from those described herein and similar generalizations can be made by those skilled in the art without departing from the spirit of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
The invention discloses a visual simulation method for clay expansion and migration in a decompression exploitation process of a argillaceous powder sand mold hydrate.
In the first step, a clay suspension is prepared.
Preparing brine capable of replacing the formation water according to the ion species and concentration of the formation water, then adding clay into the brine, stirring for more than 30min by using a magnetic stirrer to obtain a clay suspension initially, and then carrying out ultrasonic dispersion on the clay suspension for more than 1 h.
And secondly, washing the glass etching model of the visual simulation device.
As shown in fig. 1, the visualization simulation device comprises an injection system, a visualization reaction kettle 12, a glass etching model 13, a cooling circulation pump 15, a production system, a confining pressure control system, a back pressure control system and an image data acquisition system. The glass etching model 13 is positioned in the visual reaction kettle 12.
The injection system comprises a gas injection unit, a liquid injection unit and a six-way valve I10, wherein the gas injection unit comprises a methane gas cylinder 6, a pressure reducing valve 7, a gas flowmeter 8 and a one-way valve 9 which are sequentially connected, and the one-way valve 9 is connected with the six-way valve I10. The liquid injection unit comprises a constant-flow pump 1, a six-way valve II2, an intermediate container I3, an intermediate container II4 and an intermediate container III5, the constant-flow pump 1, the intermediate container I3, the intermediate container II4 and the intermediate container III5 are respectively connected with the six-way valve II2, deionized water is contained in the intermediate container I3, saline water is contained in the intermediate container II4, clay suspension is contained in the intermediate container III5, and the stirring function is achieved. The outlets of the three intermediate vessels are each directly connected to a six-way valve I10. The six-way valve I10 is also connected with the visual reaction kettle 12 and a pressure sensor I11, and the injection pressure of the liquid entering the glass etching model is measured through the pressure sensor I11.
As shown in FIGS. 2 and 3, the visual reaction kettle 12 comprises a kettle body 12-1, an upper top cover 12-2 and a lower bottom cover 12-9, wherein visual windows are respectively arranged at the center positions of the upper top cover 12-2 and the lower bottom cover 12-9, a visual window I12-3 is arranged at the center of the upper top cover 12-2, and a visual window II12-11 is arranged at the center of the lower bottom cover 12-9. The upper top cover 12-2 is fixedly connected with the top of the kettle body 12-1 through a plurality of screws and nuts 12-4, and the lower bottom cover 12-9 is fixedly connected with the bottom of the kettle body 12-1 through a plurality of screws and nuts. The central hollow cavity of the kettle body 12-1, the upper top cover 12-2, the kettle body 12-1 and the lower bottom cover 12-9 form the inner space of the visual reaction kettle 12. An annular cavity is arranged in the wall of the kettle body, a circulating liquid inlet 12-7 and a circulating liquid outlet 12-8 are arranged on the kettle body 12-1, and the circulating liquid inlet 12-7 and the circulating liquid outlet 12-8 are connected with a cooling circulating pump 15, so that cooling circulating liquid can circulate in the annular cavity of the kettle body, and the temperature of the visual reaction kettle is controlled. In this embodiment, the cooling circulation liquid may be ethylene glycol. An opening I12-5 and an opening II12-6 are arranged at the position of the upper top cover 12-2, the opening I12-5 is connected with a confining pressure control system, confining pressure liquid enters a hollow cavity of the kettle body through the opening I12-5, the opening II12-6 is connected with a temperature sensor 27, and the temperature sensor 27 is used for measuring the temperature of the confining pressure liquid. The lower bottom cover 12-9 is provided with an opening III12-10 and an opening IV12-12, the opening III12-10 is connected with a six-way valve I10 of the injection system, and the opening IV12-12 is connected with the production system.
In this embodiment, the glass etching model 13 is square, the side length of the glass etching model 13 is 40mm, the thickness is 4mm, and the pressure resistance is 2 MPa. When the glass etching model 13 is placed in the visualization reaction kettle 12, the inlet of the glass etching model 13 is in butt joint with the opening III12-10, and the outlet of the glass etching model 13 is in butt joint with the opening IV 12-12. And micron-scale pore channels are arranged in the glass etching model and used for simulating a reservoir porous medium. In this embodiment, the kettle body 12-1 is made of stainless steel material, the height is 150mm, the outer diameter is 200mm, the inner space of the visual reaction kettle 12 is 60mm, the inner diameter is 100mm, and the pressure resistance is 30 MPa. The diameters of the visible window I12-3 and the visible window II12-11 are both 50 mm.
The output system comprises a six-way valve III14, a pressure sensor II28, a recovery tank 31, a solid phase separator 18, a back pressure valve 19, a gas-liquid separator 22, a gas collecting bottle 23 and a liquid collecting bottle 24, wherein the six-way valve III14 is respectively connected with an opening IV12-12 of a lower bottom cover 12-9, the recovery tank 31, an inlet of the solid phase separator 18 and the pressure sensor II28, and the pressure sensor II28 is used for measuring the outflow pressure of the glass etching model. The inlet of the back pressure valve 19 is connected with the outlet of the solid phase separator 18, the outlet of the back pressure valve 19 is connected with the inlet of the gas-liquid separator 22, the gas outlet of the gas-liquid separator 22 is connected with the gas collecting bottle 23, and the liquid outlet of the gas-liquid separator 22 is connected with the liquid collecting bottle 24.
The confining pressure control system comprises a confining pressure control pump 16 and a three-way valve I17, the confining pressure control pump 16 is communicated with an opening I12-5 of the upper top cover 12-2 through a three-way valve I17, a pressure sensor III29 is connected to the three-way valve I17, and a pressure sensor III29 is used for measuring the pressure of confining pressure liquid in the kettle body. And injecting confining pressure liquid into the hollow cavity of the visual reaction kettle through a confining pressure control system. In the simulation process, the hollow cavity of the visual reaction kettle is filled with confining pressure liquid, the glass etching model is surrounded by the confining pressure liquid, the confining pressure liquid provides external confining pressure for the glass etching model, the effect of protecting the glass etching model is achieved, and the glass etching model is prevented from being broken due to overhigh internal pressure.
The back pressure control system comprises a back pressure control pump 20 and a three-way valve II21, the back pressure control pump 20 is communicated with a pressure interface of the back pressure valve 19 through a three-way valve II21, and a pressure sensor IV30 is connected to a three-way valve II 21. The pressure sensor IV30 is used to measure the amount of back pressure applied by the back pressure control pump.
The image-data acquisition system comprises a video microscope 25, a light source and a computer 26, wherein the video microscope 25 is connected with the computer 26 through data transmission lines, and the computer 26 is also connected with a pressure sensor I11, a pressure sensor II28, a pressure sensor III29, a pressure sensor IV30 and a temperature sensor 27 through data lines. The light source is positioned below the visual window II12-11, the intensity and the color of the light source are adjustable, and the video microscope 25 is positioned above the visual window I12-3 and can shoot simulation experiment phenomena in the glass etching model.
And adjusting the six-way valve II2 and the six-way valve I10 to enable the constant flow pump 1, the intermediate container I3 and the opening III12-10 of the lower bottom cover 12-9 to be communicated, adjusting the six-way valve III14 to enable the produced fluid of the glass etching model to flow into the recovery tank 31, injecting deionized water in the intermediate container I3 into the glass etching model 13 under the action of the constant flow pump 1, repeatedly flushing the glass etching model 13, and exhausting bubbles and residues in the glass etching model 13.
And thirdly, soaking the glass etching model in salt water.
And (3) adjusting the six-way valve II2, communicating the constant flow pump 1, the intermediate container II4 and the opening III12-10 of the lower bottom cover 12-9, and injecting the saline water in the intermediate container II4 into the glass etching model 13 under the action of the constant flow pump 1, so that the glass etching model 13 is fully soaked, and the wettability of the wall surface of the pore channel in the glass etching model 13 is ensured to reach a stable state.
And fourthly, injecting the clay suspension into the glass etching model.
And (3) adjusting the six-way valve II2 to enable the advection pump 1, the intermediate container III5 and the opening III12-10 of the lower bottom cover 12-9 to be communicated, and injecting the clay suspension in the intermediate container III into the glass etching model 13 under the action of the advection pump 1. After observing that a layer of clay is adsorbed on the surface of the pore channel in the glass etching model 13 through the video microscope 25, the advection pump 1 is closed, and the clay suspension is stopped from being injected.
And fifthly, driving out the clay particles which are not firmly adhered to the surface of the pore channel of the glass etching model.
And adjusting the six-way valve I10 to enable the gas injection unit to be communicated with the opening III12-10 of the lower bottom cover 12-9, sequentially opening the methane gas cylinder 6, the pressure reducing valve 7, the one-way valve 8 and the gas flowmeter 9, injecting gas into the glass etching model 13, and driving out the clay particles which are not firmly attached to the surface of the pore channel of the glass etching model 13.
And sixthly, repeating the fourth step and the fifth step, repeatedly injecting clay suspension and gas into the glass etching model 13, and stopping injecting the clay suspension and gas after observing that the content and distribution of clay on the surface of the pore channel tend to be stable through a video microscope 25.
And seventhly, soaking the glass etching model by using saline water again.
And (3) adjusting the six-way valve II2 and the six-way valve I10 to enable the constant flow pump 1, the intermediate container II4 and the opening III12-10 of the lower bottom cover 12-9 to be communicated, and injecting saline water into the glass etching model 13 under the action of the constant flow pump 1 to enable the saline water to soak the glass etching model 13 again.
And step eight, keeping the brine injection, and adjusting the six-way valve III14 to enable the inlet of the solid phase separator 18 to be communicated with the opening IV12-12 of the lower bottom cover 12-9. And synchronously adjusting the back pressure control pump 20 and the confining pressure control pump 16 to gradually increase the back pressure and the confining pressure to the preset pressure, always keeping the back pressure less than the confining pressure of 1MPa, and adjusting the temperature of the cooling circulating pump 15 to the preset temperature. In this embodiment, the set pressure of the back pressure control pump 20 is 7MPa, the set pressure of the confining pressure control pump 16 is 8MPa, and the set temperature of the cooling circulation pump is-1 ℃.
And ninthly, generating hydrate.
When the pressure values measured by the pressure sensor I11 and the pressure sensor II28 and the temperature value measured by the temperature sensor 27 reach stability, the six-way valve I10 is adjusted to enable the gas injection unit and the liquid injection unit to be simultaneously communicated with the opening III12-10 of the lower bottom cover 12-9, methane gas and brine are injected into the glass etching model 13 according to a set proportion, after gas-water seepage is stable, the injection is stopped, the valve for communicating the six-way valve I10 with the gas injection unit and the liquid injection unit is closed, the valve for communicating the six-way valve III14 with the recovery tank 31 and the solid phase separator 18 is closed, the glass etching model 13 is kept closed, and the generation of hydrates is waited for a while.
Tenth, after the generation and stabilization of hydrates in the glass etching model 13 are observed through the video microscope 25, the six-way valve III14 is adjusted to enable the inlet of the solid phase separator 18 to be communicated with the opening IV12-12 of the lower bottom cover 12-9, then the back pressure control pump 20 is adjusted to enable the back pressure to be gradually reduced, and during the period, the confining pressure control pump 16 is adjusted to enable the confining pressure to be synchronously reduced and always keep the confining pressure higher than the back pressure by 1 MPa.
And step eleven, gradually decomposing the hydrate along with the reduction of the back pressure, observing the behavior response of the clay in the decomposition process of the hydrate in real time by using a video microscope 25, and simultaneously measuring the front pressure and the back pressure of the glass etching model 13 in real time by using a pressure sensor I11 and a pressure sensor II 28.
The visual simulation method for clay expansion and migration in the decompression exploitation process of the argillaceous powder sand mold hydrate provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention. The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. A visual simulation method for clay expansion and migration in a depressurization exploitation process of a argillaceous powder sand mold hydrate is characterized by comprising the following steps:
s1, preparing a clay suspension;
s2, washing a glass etching model of the visual simulation device:
the visual simulation device comprises an injection system, a visual reaction kettle, a glass etching model, a cooling circulating pump, an output system, a confining pressure control system, a back pressure control system and an image data acquisition system, wherein the glass etching model is positioned in the visual reaction kettle;
the injection system comprises a gas injection unit, a liquid injection unit and a six-way valve I, wherein the gas injection unit comprises a methane gas cylinder, a pressure reducing valve, a gas flowmeter and a one-way valve which are sequentially connected, the one-way valve is connected with the six-way valve I, the liquid injection unit comprises a constant flow pump, a six-way valve II, an intermediate container I, an intermediate container II and an intermediate container III, the constant flow pump, the intermediate container I, the intermediate container II and the intermediate container III are respectively connected with the six-way valve II, deionized water is contained in the intermediate container I, saline water is contained in the intermediate container II, clay suspension is contained in the intermediate container III and has a stirring function, outlets of the three intermediate containers are respectively connected with the six-way valve I, and the six-way valve I is also connected with;
the visual reaction kettle comprises a kettle body, the device comprises an upper top cover and a lower bottom cover, wherein visual windows are respectively arranged at the central positions of the upper top cover and the lower bottom cover, the upper top cover is fixedly connected with the top of a kettle body, the lower bottom cover is fixedly connected with the bottom of the kettle body, a hollow cavity is arranged at the center of the kettle body, an annular cavity is arranged in the wall of the kettle body, a circulating liquid inlet and a circulating liquid outlet are arranged on the kettle body, the circulating liquid inlet and the circulating liquid outlet are respectively connected with a cooling circulating pump, so that cooling circulating liquid circulates in the annular cavity of the kettle body, an opening I and an opening II are arranged at the upper top cover, the opening I is connected with a confining pressure control system, the opening II is connected with a temperature sensor, an opening III and an opening IV are arranged at the lower bottom cover, the opening III is connected with a six-way valve I, the opening IV is connected with a production system;
the output system comprises a six-way valve III, a pressure sensor II, a recovery tank, a solid-phase separator, a back pressure valve, a gas-liquid separator, a gas collecting bottle and a liquid collecting bottle, wherein the six-way valve III is respectively connected with an opening IV of a lower bottom cover, the recovery tank, an inlet of the solid-phase separator and the pressure sensor II;
the confining pressure control system comprises a confining pressure control pump and a three-way valve I, the confining pressure control pump is communicated with an opening I of the upper top cover through the three-way valve I, a pressure sensor III is connected to the three-way valve I, the back pressure control system comprises a back pressure control pump and a three-way valve II, the back pressure control pump is communicated with a pressure interface of a back pressure valve through the three-way valve II, and a pressure sensor IV is connected to the three-way valve II;
the image data acquisition system comprises a video microscope, a light source and a computer, wherein the video microscope is connected with the computer through a data transmission line, and the computer is also connected with a pressure sensor I, a pressure sensor II, a pressure sensor III, a pressure sensor IV and a temperature sensor through data line connections;
adjusting the six-way valve II and the six-way valve I to enable the advection pump, the intermediate container I and the opening III of the lower bottom cover to be communicated, adjusting the six-way valve III to enable the produced fluid of the glass etching model to flow into the recovery tank, injecting deionized water in the intermediate container I into the glass etching model, repeatedly washing the glass etching model, and completely discharging bubbles and residues in the glass etching model;
s3, a saline water soaking glass etching model:
adjusting the six-way valve I to communicate the constant flow pump, the intermediate container II and the opening III of the lower bottom cover, and injecting the saline water in the intermediate container II into the glass etching model to fully soak the glass etching model;
s4, injecting a clay suspension into the glass etching model:
adjusting the six-way valve II to enable the constant-flow pump, the intermediate container III and the opening III of the lower bottom cover to be communicated, injecting the clay suspension in the intermediate container III into the glass etching model, observing that the surface of a pore channel in the glass etching model adsorbs a layer of clay through a video microscope, closing the constant-flow pump, and stopping injecting the clay suspension;
s5, driving out the clay particles which are not firmly adhered to the surface of the pore channel of the glass etching model:
adjusting the six-way valve I to enable the gas injection unit to be communicated with the opening III of the lower bottom cover, sequentially opening the methane gas cylinder, the pressure reducing valve, the one-way valve and the gas flowmeter, injecting gas into the glass etching model, and driving out clay particles which are not firmly attached to the surface of the pore channel of the glass etching model;
s6, repeating S4 and S5, repeatedly injecting clay suspension and gas into the glass etching model, and stopping injecting the clay suspension and gas after observing that the content and distribution of clay on the surface of the pore channel tend to be stable through a video microscope;
s7, soaking the glass etching model again by using saline water;
s8, keeping saline water injection, adjusting a six-way valve III to enable an inlet of the solid phase separator to be communicated with an opening IV of a lower bottom cover, synchronously adjusting a back pressure control pump and a confining pressure control pump to enable back pressure and confining pressure to be gradually increased to preset pressure, keeping the back pressure smaller than the confining pressure by 1MPa all the time, and adjusting the temperature of a cooling circulating pump to be at a preset temperature;
s9, hydrate generation:
when the pressure values measured by the pressure sensor I and the pressure sensor II and the temperature value measured by the temperature sensor are stable, adjusting the six-way valve I to enable the gas injection unit and the liquid injection unit to be simultaneously communicated with the opening III of the lower bottom cover, injecting methane gas and saline water into the glass etching model according to the proportion, stopping injecting after gas-water seepage is stable, closing a valve for communicating the six-way valve I with the gas injection unit and the liquid injection unit, and closing a valve for communicating the six-way valve III with the recovery tank and the solid phase separator to enable the glass etching model to be kept closed, and statically waiting for generation of hydrates;
s10, when the generation and the stability of hydrates in the glass etching model are observed through a video microscope, adjusting a six-way valve III to enable an inlet of a solid phase separator to be communicated with an opening IV of a lower bottom cover, adjusting a back pressure control pump to enable the back pressure to be gradually reduced, adjusting a confining pressure control pump to enable the confining pressure to be synchronously reduced, and keeping the confining pressure higher than the back pressure by 1Mpa all the time;
s11, gradually decomposing the hydrate along with the reduction of the back pressure, observing the behavior response of clay in the decomposition process of the hydrate in real time by using a video microscope, and measuring the front and back pressures of the glass etching model in real time by using a pressure sensor I and a pressure sensor II.
2. The method of claim 1, wherein: in step S1, saline water capable of replacing the formation water is prepared according to the ion species and the concentration of the formation water, then clay is added into the saline water, a magnetic stirrer is used for stirring for more than 30min to obtain a clay suspension initially, and then the clay suspension is subjected to ultrasonic dispersion for more than 1 h.
3. The method of claim 1, wherein: in step S8, the set pressure of the back pressure control pump is 7MPa, the set pressure of the confining pressure control pump is 8MPa, and the set temperature of the cooling circulation pump is-1 ℃.
4. The method of claim 1, wherein: the light source is positioned below the visual window II, and the video microscope is positioned above the visual window I.
5. The method of claim 1, wherein: the cooling circulating liquid adopts ethylene glycol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110213736.7A CN113047828B (en) | 2021-02-26 | 2021-02-26 | Visual simulation method for clay expansion and migration in pressure-reducing exploitation process of argillaceous powder sand mold hydrate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110213736.7A CN113047828B (en) | 2021-02-26 | 2021-02-26 | Visual simulation method for clay expansion and migration in pressure-reducing exploitation process of argillaceous powder sand mold hydrate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113047828A true CN113047828A (en) | 2021-06-29 |
| CN113047828B CN113047828B (en) | 2022-12-06 |
Family
ID=76509256
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110213736.7A Active CN113047828B (en) | 2021-02-26 | 2021-02-26 | Visual simulation method for clay expansion and migration in pressure-reducing exploitation process of argillaceous powder sand mold hydrate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113047828B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114878407A (en) * | 2022-05-07 | 2022-08-09 | 青岛海洋地质研究所 | Natural gas hydrate decomposition area pore scale flow field response experimental device and method |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005060957A (en) * | 2003-08-08 | 2005-03-10 | Univ Akita | Method of manufacturing methane gas from mainly methane hydrate sedimentary layer and measuring method of production characteristics of methane making mainly use of simulated hydrate sedimentary layer model |
| US20160357888A1 (en) * | 2014-11-20 | 2016-12-08 | Guangzhou Institute Of Energy Conversion, Chinese Academy Of Sciences | Simulation experiment system and simulation method of entire natural gas hydrate exploitation process |
| WO2017080353A1 (en) * | 2015-11-12 | 2017-05-18 | 中国科学院广州能源研究所 | Device for testing characteristics of sand production during mining of natural gas hydrate |
| CN107514249A (en) * | 2017-10-23 | 2017-12-26 | 大庆东油睿佳石油科技有限公司 | A kind of gas hydrates chemical flooding photoetching glass model microcosmos experiment device |
| CN107632134A (en) * | 2017-10-23 | 2018-01-26 | 大庆东油睿佳石油科技有限公司 | A kind of gas hydrates seawater drives photoetching glass model microcosmos experiment device |
| CN107894383A (en) * | 2017-11-03 | 2018-04-10 | 青岛海洋地质研究所 | Permeability measuring apparatus containing hydrate sediment and its method under condition of triaxial stress |
| CN108519384A (en) * | 2018-04-17 | 2018-09-11 | 中国石油大学(华东) | A kind of normal pressure visualization device and method generated in porous media for simulating hydrate with decomposition |
| CN109209359A (en) * | 2018-08-01 | 2019-01-15 | 中国石油大学(华东) | Gas hydrates drilling microcosmic Simulation device |
| CN110412242A (en) * | 2019-06-27 | 2019-11-05 | 青岛海洋地质研究所 | Hydrate exploits gravel packing zone blocking operating condition microcosmic mechanism evaluation method and system |
| JP3224246U (en) * | 2019-06-13 | 2019-12-05 | 広州海洋地質調査局 | Experimental apparatus for visualizing structural changes in sediments |
| CN209802865U (en) * | 2019-01-28 | 2019-12-17 | 中国地质大学（武汉） | Multifunctional reaction kettle for simulating response and sand production of hydrate exploitation reservoir |
| US20200072734A1 (en) * | 2018-08-28 | 2020-03-05 | Guangzhou Marine Geological Survey | Natural gas hydrate-bearing sediment intergranular micro-force testing device and testing method thereof |
| CN111140214A (en) * | 2020-01-15 | 2020-05-12 | 青岛海洋地质研究所 | Experimental device and method for exploiting natural gas hydrate by enhanced microwave heating |
| US20200232305A1 (en) * | 2019-01-21 | 2020-07-23 | Jilin University | Pressurized test device and method for in-situ mining natural gas hydrates by jets |
| CN212376640U (en) * | 2020-05-15 | 2021-01-19 | 青岛海洋地质研究所 | Natural gas hydrate reservoir horizontal well exploitation sand production simulation experiment device |
-
2021
- 2021-02-26 CN CN202110213736.7A patent/CN113047828B/en active Active
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005060957A (en) * | 2003-08-08 | 2005-03-10 | Univ Akita | Method of manufacturing methane gas from mainly methane hydrate sedimentary layer and measuring method of production characteristics of methane making mainly use of simulated hydrate sedimentary layer model |
| US20160357888A1 (en) * | 2014-11-20 | 2016-12-08 | Guangzhou Institute Of Energy Conversion, Chinese Academy Of Sciences | Simulation experiment system and simulation method of entire natural gas hydrate exploitation process |
| WO2017080353A1 (en) * | 2015-11-12 | 2017-05-18 | 中国科学院广州能源研究所 | Device for testing characteristics of sand production during mining of natural gas hydrate |
| CN107514249A (en) * | 2017-10-23 | 2017-12-26 | 大庆东油睿佳石油科技有限公司 | A kind of gas hydrates chemical flooding photoetching glass model microcosmos experiment device |
| CN107632134A (en) * | 2017-10-23 | 2018-01-26 | 大庆东油睿佳石油科技有限公司 | A kind of gas hydrates seawater drives photoetching glass model microcosmos experiment device |
| CN107894383A (en) * | 2017-11-03 | 2018-04-10 | 青岛海洋地质研究所 | Permeability measuring apparatus containing hydrate sediment and its method under condition of triaxial stress |
| CN108519384A (en) * | 2018-04-17 | 2018-09-11 | 中国石油大学(华东) | A kind of normal pressure visualization device and method generated in porous media for simulating hydrate with decomposition |
| CN109209359A (en) * | 2018-08-01 | 2019-01-15 | 中国石油大学(华东) | Gas hydrates drilling microcosmic Simulation device |
| US20200072734A1 (en) * | 2018-08-28 | 2020-03-05 | Guangzhou Marine Geological Survey | Natural gas hydrate-bearing sediment intergranular micro-force testing device and testing method thereof |
| US20200232305A1 (en) * | 2019-01-21 | 2020-07-23 | Jilin University | Pressurized test device and method for in-situ mining natural gas hydrates by jets |
| CN209802865U (en) * | 2019-01-28 | 2019-12-17 | 中国地质大学（武汉） | Multifunctional reaction kettle for simulating response and sand production of hydrate exploitation reservoir |
| JP3224246U (en) * | 2019-06-13 | 2019-12-05 | 広州海洋地質調査局 | Experimental apparatus for visualizing structural changes in sediments |
| CN110412242A (en) * | 2019-06-27 | 2019-11-05 | 青岛海洋地质研究所 | Hydrate exploits gravel packing zone blocking operating condition microcosmic mechanism evaluation method and system |
| CN111140214A (en) * | 2020-01-15 | 2020-05-12 | 青岛海洋地质研究所 | Experimental device and method for exploiting natural gas hydrate by enhanced microwave heating |
| CN212376640U (en) * | 2020-05-15 | 2021-01-19 | 青岛海洋地质研究所 | Natural gas hydrate reservoir horizontal well exploitation sand production simulation experiment device |
Non-Patent Citations (3)
| Title |
|---|
| WU NENGYOU ET AL.: "An integrated experimental system for gas hydrate drilling and production and a preliminary experiment of the depressurization method", 《NATURAL GAS INDUSTRY B》 * |
| 王斌等: "天然气水合物降压开采特性及效率优化研究", 《中国优秀博士学位论文全文数据库工程科技Ⅰ辑》 * |
| 董林等: "天然气水合物沉积物力学性质测试与评价", 《海洋地质前沿》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114878407A (en) * | 2022-05-07 | 2022-08-09 | 青岛海洋地质研究所 | Natural gas hydrate decomposition area pore scale flow field response experimental device and method |
| CN114878407B (en) * | 2022-05-07 | 2024-06-11 | 青岛海洋地质研究所 | Natural gas hydrate decomposition area pore scale flow field response experimental device and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113047828B (en) | 2022-12-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109113692B (en) | Matrix-fracture dual-medium huff-puff physical simulation device and method for evaluating recovery ratio in huff-puff process | |
| CN103132971B (en) | Carbon dioxide injection improves the test simulator of coal bed methane recovery rate | |
| CN111551672B (en) | Natural gas hydrate exploitation methane leakage simulation system and method | |
| CN103792118B (en) | High pressure solution gas saturation testing device and the application in gassiness soil sample is manually prepared thereof | |
| CN113062713B (en) | Experimental device and method for simulating near-well blockage and blockage removal in natural gas hydrate exploitation | |
| CN113047828B (en) | Visual simulation method for clay expansion and migration in pressure-reducing exploitation process of argillaceous powder sand mold hydrate | |
| CN113266345A (en) | Reservoir simulation unit and gas dissolution distribution evaluation device and evaluation method thereof | |
| CN109372476A (en) | A kind of production method of multi-functional fracture hole oil reservoir injecting physical model | |
| CN110070789A (en) | A kind of indoor simulation device of seawater invasion | |
| CN112082835A (en) | Preparation device and method of natural gas hydrate sample in temperature-pressure-controllable environment | |
| CN210293616U (en) | Experimental device for interaction of surface water and underground water | |
| CN210995782U (en) | Contaminated site soil-groundwater integral type simulation prosthetic devices | |
| CN111827988B (en) | Visual large-scale expansion well heat-flow-solid coupling natural gas hydrate exploitation experiment simulation device and method | |
| CN109211643A (en) | The pilot system and its method of cementing malm are prepared based on repeated precipitation | |
| CN115824921B (en) | Seepage simulation device for preventing seawater intrusion by intercepting seepage wall and measuring method thereof | |
| CN115452505B (en) | Simulation observation device and method for hydrate reaction process under seabed stress condition | |
| CN116816334A (en) | High-temperature and high-pressure water invasion experimental method for gas reservoirs considering different gas-water distribution modes | |
| CN111089949B (en) | Carbonate rock intergrowth period cementing action analogue means | |
| CN109630087B (en) | Pressurized liquid nitrogen leaching coal body fracturing anti-reflection device and anti-reflection experimental method | |
| CN209277868U (en) | A kind of simulation note odd test experiment device | |
| CN114965076B (en) | Device and method for measuring microscopic deformation of sediment framework in hydrate exploitation seepage process | |
| CN111947883A (en) | Experimental device for interaction of surface water and underground water | |
| CN105355128A (en) | Adjustable multistage underground current system test apparatus | |
| CN115565441A (en) | Experimental device and experimental method for simulating radial recharge of underground water | |
| CN211785237U (en) | Combined water injection huff and puff experimental device for nuclear magnetic resonance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |