CN114575799A - Experimental device based on nanometer-micro-nano pore structure displacement process - Google Patents
Experimental device based on nanometer-micro-nano pore structure displacement process Download PDFInfo
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- 239000011148 porous material Substances 0.000 title claims abstract description 145
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 37
- 239000011521 glass Substances 0.000 claims abstract description 109
- 238000005530 etching Methods 0.000 claims abstract description 45
- 230000000007 visual effect Effects 0.000 claims abstract description 33
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000000741 silica gel Substances 0.000 claims abstract description 27
- 229910002027 silica gel Inorganic materials 0.000 claims abstract description 27
- 239000006059 cover glass Substances 0.000 claims abstract description 22
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 16
- 239000011435 rock Substances 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000000520 microinjection Methods 0.000 claims description 11
- 239000000243 solution Substances 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 claims description 9
- 238000000576 coating method Methods 0.000 claims description 9
- 239000003292 glue Substances 0.000 claims description 9
- 230000001681 protective effect Effects 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 6
- 238000003384 imaging method Methods 0.000 claims description 6
- 238000001259 photo etching Methods 0.000 claims description 6
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- DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical compound S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 claims description 5
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 claims description 5
- 230000001070 adhesive effect Effects 0.000 claims description 5
- 229910000040 hydrogen fluoride Inorganic materials 0.000 claims description 5
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- 238000004088 simulation Methods 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 13
- 239000010779 crude oil Substances 0.000 description 11
- 238000002474 experimental method Methods 0.000 description 11
- 239000012530 fluid Substances 0.000 description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000011084 recovery Methods 0.000 description 6
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- WSNMPAVSZJSIMT-UHFFFAOYSA-N COc1c(C)c2COC(=O)c2c(O)c1CC(O)C1(C)CCC(=O)O1 Chemical compound COc1c(C)c2COC(=O)c2c(O)c1CC(O)C1(C)CCC(=O)O1 WSNMPAVSZJSIMT-UHFFFAOYSA-N 0.000 description 1
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
-
- 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
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- 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)
- Microscoopes, Condenser (AREA)
Abstract
The invention provides an experimental device based on a nano-micro nano pore structure displacement process, which comprises the following steps: the glass holder consists of a transparent silica gel sleeve, a left connector and a right connector; a visual glass etching model is arranged in the glass holder; the visual glass etching model comprises slide glass, cover glass and a nano-micro nano pore structure arranged between the slide glass and the cover glass; the nano-micro nano pore structure is formed by etching a pore network model on an aluminum sheet; two ends of the transparent silica gel sleeve are respectively sealed through the left connector and the right connector; and the insides of the left connector and the right connector are respectively provided with a pore communicated with the nano-micro nano pore structure. The model provided by the invention can more truly and accurately present the pore structure characteristics of the pore medium.
Description
Technical Field
The invention relates to the technical field of oil and gas field development, in particular to an experimental device based on a nano-micro-nano pore structure displacement process.
Background
At present, most oil fields in China enter secondary and tertiary oil recovery stages, and the research on how to further improve the crude oil recovery ratio after the secondary and tertiary oil recovery stages has very important significance in realizing the full utilization of resources. For research, physical models are mostly used to study how to improve the recovery efficiency, seepage mechanism, etc.
Firstly, most of China currently adopts two slides to form a physical model, and the two slides are manually pinched without sintering, so that the two slides are convenient to recycle; secondly, the size of a part of pore channels in the model is nano-micro nanometer, and water vapor exists in the model in the manual pinching process, so that the subsequent experiment of the model is difficult to carry out full saturated oil, and if the saturation pressure is high, the glass slide is broken; and if the size of the model pore channel is nano-micro nano, when the model is placed under a microscope for observation, the objective lens of the microscope needs to be adjusted to a position close to the model for clear observation, so that the model cannot be placed in a clamp holder with too large size.
In order to meet the requirement that a model can be repeatedly utilized for many times and cannot be broken under certain pressure, a microscopic model and an experimental device for placing the model are urgently needed, and when fluid in the model flows, the fluid channeling and breaking are not easily caused by the generated fluid internal pressure and injection pressure, so that the experimental device based on the nano-micro nano pore structure displacement process is adopted, and the requirement of people on microscopic experimental research is met.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an experimental device based on a nano-micro nano pore structure displacement process.
An experimental device based on nanometer-micro nanometer pore structure displacement process includes: the visual glass etching model is sealed inside the transparent silica gel sleeve through a left connector and a right connector which are respectively arranged at two ends of the transparent silica gel sleeve;
the visual glass etching model comprises slide glass, cover glass and a nano-micro nano pore structure arranged between the slide glass and the cover glass; the nano-micro nano pore structure is formed by etching a pore network model on an aluminum sheet;
and the insides of the left connector and the right connector are respectively provided with a pore communicated with the nano-micro nano pore structure.
Further, the experimental apparatus based on the nano-micro nano-porous structure displacement process as described above further includes: a housing;
the shell consists of a frame and transparent glass arranged on the front surface and the rear surface of the frame;
the transparent silica gel sleeve is sealed in the cavity of the shell;
the end parts of the left connector and the right connector respectively penetrate through the side edge of the shell and are exposed outside.
Further, in the experimental device based on the nano-micro nano pore structure displacement process, an air inflation hole is formed in the side edge of the shell;
an inlet channel and an emptying channel are arranged on the left connecting head; an outlet channel is arranged on the right connecting head;
the inlet channel and the emptying channel are communicated with the pore channel; the outlet channel is communicated with the nano-micro nanometer pore structure.
Further, according to the experimental device based on the nano-micro nano-pore structure displacement process, the left connector is fixed on the frame through the U-shaped square clamp; the end part of the left connector tightly props against the inner wall of the U-shaped square card.
Further, according to the experimental device based on the nano-micro nano pore structure displacement process, after the end of the right connector penetrates through the fixing plate, the right connector is fixed on the frame through the screw compression bracket and the compression screw.
Further, the experimental apparatus based on the nano-micro nano-porous structure displacement process as described above further includes: micro-injection pump, syringe, microscope, computer, container;
the microscope is used for observing the oil-water displacement process of the nano-micro nanometer pore structure; the computer is connected with the microscope;
the injector is used for injecting liquid into the inlet channel; the micro injection pump is used for controlling the injection amount of the injector;
the container is in communication with the outlet passage via a conduit.
Further, according to the experimental device based on the nano-micro nano-porous structure displacement process, the pore network model extracts the rock framework and the pore channels according to the cast body slice of the real oil reservoir rock sample to form corresponding pore simulation.
Further, according to the experimental apparatus based on the nano-micro nano-porous structure displacement process, the preparation of the visual glass etching model comprises the following steps:
step 1: designing a pore network structure in the model: extracting a rock framework and a pore channel by software according to a cast body slice of a real oil reservoir rock sample to form a corresponding pore network model; or a pore network model is automatically designed according to parameters such as coordination number, pore-throat ratio, roar radius and the like; drawing an injection section and a production section at two ends of the pore network model to be connected with the pore network model so as to form a pore network structure;
step 2: preparing a glass sheet: wiping the glass slide and the glass cover plate by using non-woven fabrics, and tiling and pasting a metal aluminum sheet on the glass slide;
and step 3: coating a protective layer: uniformly coating a tackifier AR 300-80 on the metal aluminum sheet, and uniformly coating a protective adhesive AR-P3220 on the tackifier;
and 4, step 4: imaging by using a photoetching mask plate: etching the pore network structure on the protective glue through the imaging of a photoetching mask, and then displaying the pore network structure pattern on the protective glue by using a developing solution AR 300-26;
and 5: acid etching: firstly, carrying out acid etching on pores in the pore network structure on the slide glass by using a hydrochloric acid solution, and further corroding the pores in the pore network structure on the slide glass by using a mixed solution of ammonium fluoride and hydrogen fluoride to deepen the pores to a preset depth to form a glass etching model;
step 6: cleaning: removing the protective layer on the glass slide by using a degumming agent, washing the glass slide by using deionized water, and baking the glass slide by using a baking glue plate;
and 7: molding a model: and bonding the surface of the slide glass with the pore network structure with the cover glass to form a visual glass etching model.
Further, according to the experimental device based on the nano-micro nano pore structure displacement process, the diameter of the three-dimensional channel in the visual glass etching model is 5-300 nm and 0.5-50 μm.
Further, in the experimental device based on the nano-micro nano-porous structure displacement process, the transparent silica gel sleeve is in a dumbbell-shaped structure, and joint ports are arranged at two ends of the transparent silica gel sleeve; the joint end is used for inserting one end of the left connector and one end of the right connector and sealing and fixing the left connector and the right connector through rubber rings;
the visual glass etching model is arranged in the channel between the two joint ports.
The invention has the following beneficial effects:
1. the embodiment provides the experimental device, as the slide glass, the cover glass and the nano-micro nano pore structure of the visual glass etching model only need to be clamped in the transparent silica gel sleeve, the condition that the subsequent experiment cannot fully saturate oil due to the existence of water vapor in the manual pinching process of the glass slide is avoided, and in addition, as the nano-micro nano pore structure is formed by etching the pore network model on the aluminum sheet, the model provided by the invention can more truly and accurately present the pore structure characteristics of the pore medium. The device provided by the invention can clearly observe and interpret the flowing characteristics of the fluid by matching the microscopic visual etching model and the microscopic seepage visual model after trial production and processing of the high-resolution observation and acquisition system, the displacement system and the like, and provides guidance for improving secondary and tertiary development effects.
2. The invention bonds a metal aluminum sheet on the glass of the slide glass, then etches the metal aluminum sheet into a required pore network structure, on the basis of the pore network structure, the slide glass is further corroded by the mixed solution of ammonium fluoride and hydrogen fluoride, so that the depth of the pore channel of the pore network structure is further deepened in the longitudinal direction, meanwhile, due to the protection effect of the aluminum metal sheet, the depth of the pore channel of the slide glass 12 in the transverse direction cannot be widened, so that the depth of the pore network structure can be etched to a preset depth, through the preset depth which can be reached, the device of the invention can be suitable for the experiment of water flooding, but also can be suitable for the realization of the subsequent fluid formed by polymer microspheres, prefabricated particle gel, nano materials and the like, thereby providing richer experimental data for improving the crude oil recovery ratio.
3. According to the embodiment of the invention, the glass clamp is arranged in the shell, so that the dust of the glass clamp can be prevented from entering the visual glass etching model to influence the experiment precision; in the subsequent experiment process, when the fluid in the nano-micro nanometer pore channel flows, the flowing state of the fluid can be more clearly and truly reflected under a microscope.
4. According to the embodiment of the invention, the side wall of the transparent silica gel sleeve 1 can tightly suck the slide glass and the cover glass by injecting nitrogen into the shell through the inflation hole, so that the whole visual glass is more tightly attached, the phenomenon that the whole visual glass is separated due to overhigh internal pressure of fluid in the experiment process is avoided, and the flowing environment of the fluid in the stratum can be simulated more accurately.
5. The invention adopts two pieces of glass with the same size, and a mode of obtaining a nano-micro nano pore channel structure by etching an aluminum sheet is arranged in the middle, so that the glass has excellent light transmission, and the flowing state of the fluid can be observed more clearly.
Drawings
FIG. 1 is a structural diagram of an experimental device based on a nano-micro-nano pore structure displacement process in the invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a schematic diagram of an experimental apparatus for displacement process based on nano-micro nanometer pore structure according to the present invention;
FIG. 4 is a schematic view of the structure of the transparent silica gel cover of the present invention;
FIG. 5 is a first schematic view of a pore network model structure;
FIG. 6 is a schematic view of a pore network model structure II;
in the figure, 1, a transparent silica gel sleeve, 2, a left connector, 21, an emptying channel, 22, an inlet channel, 23, an outlet channel, 24, a hole channel, 3, a right connector, 4, a shell, 41, a frame, 42, an inflation hole, 5, a fixing plate, 51, a screw, 6, a screw pressing bracket, 61, a pressing screw, 7, a stainless steel U-shaped square clamp, 8, a container, 9, a micro-injection pump, 10, cover glass, 11, an aluminum sheet, 12, slide glass, 13, an injector, 14, a microscope, 15, a computer, 16, a light source and 17-connector ports.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are described clearly and completely below, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
As shown in fig. 1 and fig. 2, the present invention provides an experimental apparatus based on a nano-micro nano-porous structure displacement process, including: the glass holder consists of a transparent silica gel sleeve 1, a left connector 2 and a right connector 3; a visual glass etching model is arranged in the glass holder;
the visual glass etching model comprises slide glass 12, cover glass 10 and a nano-micro nano pore structure arranged between the slide glass and the cover glass; the nano-micro nano pore structure is formed by etching a pore network model on an aluminum sheet 11;
two ends of the transparent silica gel sleeve 1 are respectively sealed through the left connector 2 and the right connector 3;
and the insides of the left connector 2 and the right connector 3 are respectively provided with a pore 24 communicated with the nano-micro nano pore structure.
The embodiment provides an experimental device, because the slide glass 12, the cover glass 10 and the nano-micro nano pore structure of the visual glass etching model can be replaced according to different requirements, and the replaced slide glass 12, the cover glass 10 and the nano-micro nano pore structure only need to be clamped in the transparent silica gel sleeve 1, so that the device can be reused.
In addition, the nano-micro nanometer pore channel structure is formed by etching a pore network model on the aluminum sheet 11, so that the model provided by the invention can more truly and accurately present the pore structure characteristics of the pore medium.
Further, the pore network model is built by extracting a rock framework and pore channels according to the cast body slice of the real oil reservoir rock sample and forming corresponding holes. The preparation of the visual glass etching model comprises the following steps:
step 1: designing a pore network structure in the model: extracting a rock framework and a pore channel by software according to a cast body slice of a real oil reservoir rock sample to form a corresponding pore network model; or a pore network model is automatically designed according to parameters such as coordination number, pore-throat ratio, roar radius and the like; drawing an injection section and a production section at two ends of the pore network model to be connected with the pore network model so as to form a pore network structure;
step 2: preparing a glass sheet: wiping the slide glass 12 and the cover glass 10 clean by using non-woven fabrics, and tiling and pasting a metal aluminum sheet on the slide glass 12 to form the slide glass 12;
and step 3: coating a protective layer: uniformly coating a tackifier AR 300-80 on the metal aluminum sheet, and uniformly coating a protective adhesive AR-P3220 on the tackifier;
and 4, step 4: imaging by using a photoetching mask plate: etching the pore network structure in the step (1) on the protective adhesive through the imaging of a photoetching mask, and then displaying the pore network structure pattern on the protective adhesive by using developing solution AR 300-26;
and 5: acid etching: firstly, carrying out acid etching on pores in the pore network structure on the slide glass 12 by using a hydrochloric acid solution, and then corroding the pores in the pore network structure on the slide glass 12 by using a mixed solution of ammonium fluoride and hydrogen fluoride to deepen the depth of the pore network structure to a preset depth so as to form a glass etching model;
step 6: cleaning: removing the protective layer on the slide glass 12 by using a glue removing agent, washing the slide glass 12 by using deionized water, and baking the slide glass by using a glue baking plate;
and 7: molding a model: and bonding one surface of the slide glass 12 with the porous network structure with the cover glass 10 to form a visual glass etching model.
According to the experimental device provided by the embodiment of the invention, the pore network model is built by extracting a rock framework and pore channels according to a real cast body slice of an oil reservoir rock sample and forming corresponding holes. The patterns are shown in fig. 5 and 6. The pore network model extracts the rock framework and the pore channel according to the real cast body slice of the oil reservoir rock sample, so the experimental result can be more accurate.
More importantly, the invention bonds the metallic aluminum sheet on the slide glass 12, then etches the metallic aluminum sheet into the needed pore network structure, on the basis of the pore network structure, the slide glass 12 is further corroded by the mixed solution of ammonium fluoride and hydrogen fluoride, so that the depth of the pore channel of the pore network structure is further deepened in the longitudinal direction, meanwhile, due to the protection effect of the aluminum metal sheet, the depth of the pore channel of the slide glass 12 in the transverse direction cannot be widened, so that the depth of the pore network structure can be etched to a preset depth, through the preset depth which can be reached, the device of the invention can be suitable for the experiment of water flooding, but also can be suitable for the realization of the subsequent fluid formed by polymer microspheres, prefabricated particle gel, nano materials and the like, thereby providing richer experimental data for improving the crude oil recovery ratio.
Further, as shown in fig. 4, in the experimental apparatus based on the nano-micro nano-porous structure displacement process, the transparent silica gel sleeve 1 is in a dumbbell-shaped structure, and two ends of the transparent silica gel sleeve are provided with joint ports 17; the joint port 17 is used for inserting one end of the left connector 2 and one end of the right connector 3 and sealing and fixing the left connector and the right connector through rubber rings;
the visual glass etch model is placed in the channel between the two connector ports 17.
Further, the experimental apparatus based on the nano-micro nano pore structure displacement process further includes: a housing 4;
the housing 4 is composed of a frame 41 and transparent glass installed on the front and back surfaces of the frame 41;
the transparent silica gel sleeve 1 is sealed in the cavity of the shell 4;
the end parts of the left connector 2 and the right connector 3 respectively penetrate through the side edge of the shell 4 and are exposed outside.
According to the embodiment of the invention, the glass clamp is arranged in the shell 4, so that the dust of the glass clamp can be prevented from entering the visual glass etching model to influence the experimental precision.
Further, an air charging hole 42 is arranged at the side of the shell 4;
an inlet channel 22 and an emptying channel 21 are arranged on the left connector 2; an outlet channel 23 is arranged on the right connector 3;
the inlet channel 22 and the emptying channel 21 are communicated with the pore channel 24; the outlet channel 23 is communicated with the nano-micro nano pore structure.
Before the experiment of water flooding, firstly, the nano-micro nano pore channel structure and the pore channel 24 are completely dredged and are not blocked, so the experiment needs to be carried out through the inlet channel 22, the emptying channel 21 and the outlet channel 23. The experimental method is as follows: the outlet channel 23 is first blocked and then the liquid is injected through the inlet channel 22, indicating that the air-tightness and the openness of the whole device are good when the injected liquid flows out from the outlet channel 23 and there is no leakage. Then the emptying channel 21 is blocked; experiments on flooding were conducted through the inlet channel 22 and the outlet channel 23.
In the embodiment of the invention, the side wall of the transparent silica gel sleeve 1 is tightly attached to the visual glass etching model in a mode of injecting nitrogen into the shell 4 through the air charging hole 42, so that the slide glass 12 and the cover glass 10 are attached more tightly, the nano-micro nano pore structure is more stable, and the experimental process is more stable and reliable.
Further, embodiments of the present invention provide a way to stably secure a glass holder, namely: the left connector 2 is fixed on the frame 41 through a U-shaped square clamp 7; the end part of the left connecting head 2 is tightly propped against the inner wall of the U-shaped square card 7.
Further, embodiments of the present invention provide a way to stably secure a glass holder, namely: the end of the right connector 3 is fixed on the frame 41 by the screw pressing bracket 6 and the pressing screw 61 after passing through the fixing plate 5.
Further, as shown in fig. 3, the experimental apparatus provided by the present invention further includes: a micro-injection pump 9, an injector 13, a microscope 14, a computer 15, and a container 8;
the microscope 14 is used for observing an oil-water displacement process of the nano-micro nanometer pore structure; the computer 15 is connected with the microscope 14;
the injector 13 is used to inject liquid into the inlet passage 22; the micro injection pump 9 is used for controlling the injection amount of the injector 13;
the container 8 communicates with the outlet channel 23 by means of a pipe.
The experimental device provided by the embodiment of the invention comprises the following operation steps:
1) after the cover glass and the slide glass are wiped clean by non-woven fabrics, the nano-micro nano pore structure is arranged between the cover glass and the slide glass and is tightly attached, so that a three-dimensional channel structure formed by the cover glass and the slide glass is positioned between the two pieces of glass, and a visual glass whole is formed;
3) placing the whole visible glass in the inner cavity of the transparent silica gel sleeve, and adjusting two ends of the glass clamp holder to fix;
4) nitrogen is filled into the shell 4 through the air filling hole 41, so that the transparent silica gel sleeve tightly sucks the upper surface and the lower surface of the whole visual glass, and the whole visual glass is tightly attached;
5) plugging the outlet channel 23;
6) the glass holder is flatly placed on a bearing platform of a microscope 11, the injection flow rate of a micro-injection pump 9 is set, a slide block on the micro-injection pump pushes a piston of an injector 10, so that crude oil or crude oil distributed with polymer microspheres is injected through an inlet channel 22, whether continuous crude oil flows out from a channel port of an emptying channel 21 is observed, and if the continuous crude oil flows out from the channel port of the emptying channel 21, whether the inlet channel 22 is communicated with the emptying channel 21 is checked; if continuous crude oil flows out through the outlet channel 23, the micro-injection pump 9 is closed;
7) acquiring the saturation condition of crude oil in the nano-micro nano-pore structure in real time through a microscope 11 until continuous crude oil flows out of an outlet channel, and closing a micro-injection pump; collecting related experimental data and images;
8) replacing the injector 13, and injecting water into the inlet channel 22 to drive the water to replace the injected crude oil;
9) the process information of water displacement oil in the nano-micro nano pore structure in the whole glass is collected and visualized through a microscope 14, and relevant experimental data and images are collected.
9. The experimental device based on the nano-micro nano pore structure displacement process as claimed in claim 1, wherein the diameter of the three-dimensional channel in the visual glass etching model is 5-300 nm and 0.5-50 μm.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. An experimental device based on nanometer-micro nanometer pore structure displacement process, characterized by comprising: the transparent silica gel sleeve (1), wherein a visual glass etching model is arranged in the transparent silica gel sleeve (1), and the visual glass etching model is sealed in the transparent silica gel sleeve (1) through a left connector (2) and a right connector (3) which are respectively arranged at two ends of the transparent silica gel sleeve (1);
the visual glass etching model comprises slide glass (12), cover glass (10) and a nano-micro nano pore structure arranged between the slide glass and the cover glass; the nano-micro nano pore structure is formed by etching a pore network model on an aluminum sheet (11);
and the insides of the left connector (2) and the right connector (3) are respectively provided with a pore (24) communicated with the nano-micro nano pore structure.
2. The experimental device for the displacement process based on the nano-micro nano pore structure according to claim 1, further comprising: a housing (4);
the shell (4) is composed of a frame (41) and transparent glass arranged on the front and back surfaces of the frame (41);
the transparent silica gel sleeve (1) is sealed in the cavity of the shell (4);
the end parts of the left connector (2) and the right connector (3) respectively penetrate through the side edge of the shell (4) and are exposed outside.
3. The experimental device based on the nano-micro nano pore structure displacement process as claimed in claim 2, wherein an air inflation hole (42) is arranged at the side of the housing (4);
an inlet channel (22) and an emptying channel (21) are arranged on the left connector (2); an outlet channel (23) is arranged on the right connector (3);
the inlet channel (22) and the emptying channel (21) are communicated with the pore channel (24); the outlet channel (23) is communicated with the nano-micro nano pore structure.
4. The experimental device based on nano-micro nano pore structure displacement process as claimed in claim 2, wherein the left connector (2) is fixed on the frame (41) through a U-shaped square clamp (7); the end part of the left connector (2) is tightly propped against the inner wall of the U-shaped square card (7).
5. The experimental device for the nano-micro nano pore structure based displacement process according to claim 2, wherein the end of the right connector (3) is fixed on the frame (41) through a screw pressing bracket (6) and a pressing screw (61) after passing through the fixing plate (5).
6. The experimental device for displacement process based on nano-micro nano pore structure according to claim 3, further comprising: a micro-injection pump (9), an injector (13), a microscope (14), a computer (15) and a container (8);
the microscope (14) is used for observing the oil-water displacement process of the nano-micro nanometer pore structure; the computer (15) is connected with the microscope (14);
the injector (13) is used for injecting liquid into the inlet channel (22); the micro injection pump (9) is used for controlling the injection amount of the injector (13);
the container (8) communicates with the outlet channel (23) by means of a conduit.
7. The experimental device for displacement process based on nano-micro nano-porous structure according to claim 1, wherein the pore network model is formed by extracting a rock framework and pore channels according to a cast body slice of a real oil reservoir rock sample and forming corresponding pore simulation.
8. The experimental device for the nano-micro nano pore structure based displacement process as claimed in claim 7, wherein the preparation of the visual glass etching model comprises the following steps:
step 1: designing a pore network structure in the model: extracting a rock framework and a pore channel by software according to a cast body slice of a real oil reservoir rock sample to form a corresponding pore network model; or a pore network model is automatically designed according to parameters such as coordination number, pore-throat ratio, roar radius and the like; drawing an injection section and a production section at two ends of the pore network model to be connected with the pore network model so as to form a pore network structure;
and 2, step: preparing a glass sheet: wiping the glass carrier (12) and the cover glass (10) clean by using non-woven fabrics, and tiling and pasting a metal aluminum sheet on the glass carrier (12);
and step 3: coating a protective layer: uniformly coating a tackifier AR 300-80 on the metal aluminum sheet, and uniformly coating a protective adhesive AR-P3220 on the tackifier;
and 4, step 4: imaging by using a photoetching mask plate: etching the pore network structure in the step (1) on the protective glue through photoetching mask plate imaging, and then displaying the pore network structure pattern on the protective glue by using developing solution AR 300-26;
and 5: acid etching: firstly, carrying out acid etching on pores in the pore network structure on the slide glass (12) by using a hydrochloric acid solution, and then further corroding the pores in the pore network structure on the slide glass (12) by using a mixed solution of ammonium fluoride and hydrogen fluoride to deepen the pores to a preset depth to form a glass etching model;
and 6: cleaning: removing the protective layer on the slide glass (12) by using a glue removing agent, washing the slide glass (12) by using deionized water, and baking the slide glass by using a glue baking plate;
and 7: molding a model: and bonding one surface of the slide glass (12) with the porous network structure with the cover glass (10) to form a visual glass etching model.
9. The experimental device based on the nano-micro nano pore structure displacement process as claimed in claim 1, wherein the diameter of the three-dimensional channel in the visual glass etching model is 5-300 nm and 0.5-50 μm.
10. The experimental device based on the nano-micro nano pore structure displacement process as claimed in claim 1, wherein the transparent silica gel sleeve (1) is in a dumbbell-shaped structure, and both ends of the transparent silica gel sleeve are provided with joint ports (17); the joint port (17) is used for inserting one end of the left connector (2) and one end of the right connector (3) and sealing and fixing the connectors through rubber rings;
the visual glass etching model is arranged in a channel between the two joint ports (17).
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