CN106437671B - Visual crack type rock plate acid liquor etching experimental device and experimental method - Google Patents
Visual crack type rock plate acid liquor etching experimental device and experimental method Download PDFInfo
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- CN106437671B CN106437671B CN201611046285.8A CN201611046285A CN106437671B CN 106437671 B CN106437671 B CN 106437671B CN 201611046285 A CN201611046285 A CN 201611046285A CN 106437671 B CN106437671 B CN 106437671B
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- 239000002253 acid Substances 0.000 title claims abstract description 153
- 230000000007 visual effect Effects 0.000 title claims abstract description 152
- 239000011435 rock Substances 0.000 title claims abstract description 122
- 238000005530 etching Methods 0.000 title claims abstract description 81
- 238000002474 experimental method Methods 0.000 title claims abstract description 68
- 239000007788 liquid Substances 0.000 claims abstract description 103
- 238000007789 sealing Methods 0.000 claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000002699 waste material Substances 0.000 claims abstract description 22
- 238000002347 injection Methods 0.000 claims description 26
- 239000007924 injection Substances 0.000 claims description 26
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 239000007769 metal material Substances 0.000 claims description 4
- 239000011521 glass Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 25
- 230000015572 biosynthetic process Effects 0.000 description 7
- 239000011148 porous material Substances 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 230000020477 pH reduction Effects 0.000 description 2
- 238000012800 visualization Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000010454 slate Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- ing And Chemical Polishing (AREA)
Abstract
The invention discloses a visual crack type rock acid liquid etching experimental device and an experimental method, wherein the experimental device comprises a visual experimental unit, an acid supply unit, a pressure supply unit and a waste liquid collecting unit, the visual experimental unit comprises a protective frame, a visual rock cover, a visual rubber sleeve, a sealing cover, a liquid inlet port and a liquid outlet port, the protective frame comprises a top plate, a bottom plate and two side plates arranged at two ends of the top plate and the bottom plate, first mounting ports are arranged on the two side plates, and a first water inlet is arranged on the top plate; the visual rock plate cover is inserted into the protection frame, a second water inlet is formed in the top of the visual rock plate cover, the visual rubber sleeve is inserted into the visual rock plate cover, and an annular space is reserved between the visual rubber sleeve and the visual rock plate cover; the sealing covers are arranged on the first mounting openings at the two ends of the protective frame and seal the annular space; the acid supply unit is connected with a liquid inlet of the liquid inlet port, the pressure supply unit is connected with the second water inlet, and the waste liquid collection unit is connected with a liquid outlet of the liquid outlet port.
Description
Technical Field
The invention relates to the technical field of oil and gas field development experiment equipment, in particular to a visual crack type rock plate acid liquor etching experiment device and an experiment method.
Background
The hydraulic fracturing and the acidification of oil and gas wells are currently widely used measures for modifying reservoir layers of oil and gas reservoirs, and particularly, artificial fracture formation is carried out through fracturing, and then acidification is carried out to improve the seepage capability of a stratum.
The acid liquid can enter into the cracks or pores to react with the rock, so that the walls of the cracks or the walls of the pores are corroded, the width of the cracks is enlarged, the volume of the pores is enlarged, and the seepage conditions of the fluid are improved. And the acid liquor can erode the plugs in the cracks or the pore channels or destroy the structures of the plugs to disintegrate the plugs, and then the acid liquor is discharged out of the stratum along with the residual acid, so that the function of dredging a flow passage is achieved, and the original seepage capability of the stratum is recovered or the seepage capability of the stratum is improved.
At present, most of the acidizing researches on a fracture type reservoir stratum or a manual fracture-making reservoir stratum through fracturing stay on the theoretical level, and physical simulation experiments are few. Part of physical simulation experiments are to use cores to research the effect of acidizing etching and can not be visualized, and the rock plate can better reflect the etching phenomenon of stratum acidizing.
Therefore, it is necessary to provide an experimental apparatus and an experimental method for acid etching of fractured rock plates, which can realize visualization.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide an experimental device and an experimental method which can research the etching condition of acid liquor on a fractured rock plate under the conditions of different stratum pressures, acid liquor concentrations, acid injection speeds and even temperatures.
The invention provides a visual crack type rock acid liquid etching experimental device which comprises a visual experimental unit, an acid supply unit, a pressure supply unit and a waste liquid collecting unit,
the visual experiment unit comprises a protection frame, a visual rock plate cover, a visual rubber sleeve, a sealing cover, a liquid inlet port and a liquid outlet port, the protection frame comprises a top plate, a bottom plate and two side plates arranged at two ends of the top plate and the bottom plate, a first mounting port is formed in each of the two side plates, and a first water inlet is formed in the top plate; the visual rock plate cover is inserted into the protection frame, a second water inlet corresponding to the first water inlet is formed in the top of the visual rock plate cover, the visual rubber sleeve is inserted into the visual rock plate cover, and an annular space is reserved between the visual rubber sleeve and the visual rock plate cover; the sealing cover is arranged on the first mounting openings at the two ends of the protection frame and seals the annular space, and a second mounting opening is also arranged on the sealing cover; the liquid inlet port and the liquid outlet port are respectively arranged on the second mounting port of the sealing cover, and are both communicated with the inner cavity of the visual rubber sleeve;
the acid supply unit is connected with a liquid inlet of the liquid inlet port, the pressure supply unit is connected with the second water inlet, and the waste liquid collecting unit is connected with a liquid outlet of the liquid outlet port.
According to one embodiment of the visual fracture type rock acid etching experimental device, the fracture type rock is placed in the inner cavity of the visual rubber sleeve to carry out an acid etching experiment.
According to one embodiment of the visual crack type rock plate acid liquor etching experimental device, the visual rubber sleeve is formed by splicing metal materials at two ends and a transparent rubber material in the middle, and the visual rock plate cover is made of high-strength transparent glass or transparent plastic.
According to one embodiment of the visual crack type rock acid etching experimental device, first sealing rings are arranged between two ends of the visual rubber sleeve and the sealing cover, and the first sealing rings are sleeved on two ends of the visual rubber sleeve; and second sealing rings are arranged among the liquid inlet port, the liquid outlet port and the sealing cover.
According to one embodiment of the visual fractured rock acid etching experimental device, the acid supply unit comprises an acid storage tank, an acid injection pipe and a constant-flow pump, and the acid storage tank is connected with a liquid inlet of the liquid inlet port through the acid injection pipe and the constant-flow pump arranged on the acid injection pipe.
According to one embodiment of the visual crack type rock acid etching experimental device, the pressure supply unit comprises a water storage tank, a booster pump and a water injection pipe, the water storage tank is connected with the second water inlet through the booster pump and the water injection pipe, and the booster pump is further provided with a rotating handle and a pressure gauge.
According to an embodiment of the visual fracture type rock acid etching experimental device, the waste liquid collecting unit comprises an acid outlet pipe and a waste liquid storage tank.
According to an embodiment of the visual crack type rock acid etching experimental device, the experimental device further comprises a temperature control unit, the temperature control unit comprises a heating plate and a temperature controller, the heating plate is inserted into the protection frame and located on one side of the visual rubber sleeve and one side of the visual rock cover, and the temperature controller is electrically connected with the heating plate.
The invention also provides a visual fracture type rock acid etching experimental method, which is used for carrying out acid etching experiments on fracture type rock plates.
According to one embodiment of the visual crack type rock plate acid etching experimental method, the method comprises the following steps:
A. after the sealing cover is ensured to be sealed completely, the crack-shaped rock plate is placed into a visual rubber sleeve of the visual experiment unit, a liquid inlet port and a liquid outlet port are installed and connected with an acid supply unit, a pressure supply unit and a waste liquid collecting unit, and the visual crack-shaped rock plate acid liquid etching experiment device is ensured to be sealed integrally;
B. controlling a pressure supply unit to inject water into the annular space of the visual experiment unit to form high pressure until the experiment requirement is met;
C. controlling an acid supply unit to inject prepared preset acid liquid into the fractured rock slab of the visual experiment unit according to the preset acid injection speed of the experiment, wherein optionally the experiment temperature is adjusted to meet the experiment requirement by using a temperature control unit;
D. observing the flowing characteristics of the preset acid liquor and the etching condition of the rock plate through the visual rock plate cover and recording the phenomenon of the acid liquor etching experiment;
E. and (4) after the experiment is finished, relieving confining pressure, recovering acid liquor, taking out the crack-shaped rock plate for analysis, and using the cleaning device for the next time.
Compared with the prior art, the visual crack type rock plate acid liquid etching experimental device and the experimental method have the following advantages: (1) the operation is simple; (2) the etching rule of acid liquor on the fractured reservoir can be researched under different stratum pressures, acid liquor concentrations and acid injection speeds; (3) the confining pressure is provided by a booster pump, so that the formation pressure can be simulated; (4) the flowing condition of the acid liquid and the etching rule of the rock plate can be visually observed.
Drawings
Fig. 1 shows a schematic perspective structure diagram of a visual fracture-type rock-acid etching experimental device according to an exemplary embodiment of the present invention.
Fig. 2 shows a schematic top-view structural diagram of a visual fractured rock acid etching experimental device according to an exemplary embodiment of the invention.
Fig. 3 shows a schematic front view structure diagram of a visual fracture-type rock acid etching experimental device according to an exemplary embodiment of the invention.
Fig. 4 shows a schematic structural diagram of a protective frame in a visual fractured rock acid etching experimental device according to an exemplary embodiment of the invention.
Fig. 5 shows a schematic structural diagram of a visual rock plate cover in the visual fracture type rock plate acid etching experimental device according to an exemplary embodiment of the invention.
Fig. 6 shows a schematic structural diagram of a visualized rubber sleeve in the visualized fracture-type rock acid etching experimental device according to an exemplary embodiment of the invention.
Fig. 7 shows a schematic structural diagram of a first sealing ring in a visual crack-type rock acid etching experimental device according to an exemplary embodiment of the invention.
Fig. 8 shows a schematic structure diagram of the combined components in fig. 4 to 7.
Fig. 9 shows a schematic structural diagram of a sealing cover in a visual crack type rock plate acid etching experimental device according to an exemplary embodiment of the invention.
Fig. 10 shows a schematic structural diagram of a liquid inlet port in a visual fractured rock acid etching experimental device according to an exemplary embodiment of the invention.
Fig. 11 shows a schematic structural diagram of a liquid outlet port in a visual fracture type rock acid etching experimental apparatus according to an exemplary embodiment of the invention.
Fig. 12 shows a schematic structural diagram of a second sealing ring in a visual crack-type rock acid etching experimental device according to an exemplary embodiment of the invention.
Fig. 13 shows a schematic structural diagram of an acid supply unit in a visual fracture type rock acid etching experimental apparatus according to an exemplary embodiment of the present invention.
Fig. 14 shows a schematic perspective structure diagram of a visual fractured rock acid etching experimental device according to another exemplary embodiment of the invention.
Description of reference numerals:
1-acid storage tank, 2-advection pump, 3-liquid inlet port, 4-second sealing ring, 5-sealing cover, 6-protective frame, 7-visual rock plate cover, 8-heating plate, 9-first water inlet, 10-visual rubber sleeve, 11-first sealing ring, 12-liquid outlet port, 13-waste liquid storage tank, 14-booster pump, 15-rotating handle, 16-pressure gauge, 17-water storage tank, 18-temperature controller, 19-acid injection pipe, 20-water injection pipe, 21-acid outlet pipe, 22-second water inlet, 23-first mounting port, 24-second mounting port, 25-liquid inlet port, 26-liquid outlet port and 27-liquid outlet port.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
The structure and the principle of the visual crack type rock plate acid liquid etching experimental device of the invention will be explained in detail.
Fig. 1 shows a schematic perspective structure diagram of a visual fractured rock acid etching experimental device according to an exemplary embodiment of the invention, fig. 2 shows a schematic top-view structure diagram of the visual fractured rock acid etching experimental device according to the exemplary embodiment of the invention, and fig. 3 shows a schematic front-view structure diagram of the visual fractured rock acid etching experimental device according to the exemplary embodiment of the invention.
As shown in fig. 1 to 3, according to an exemplary embodiment of the present invention, the visual fracture type rock acid etching experimental apparatus includes a visual experimental unit, an acid supply unit, a pressure supply unit and a waste liquid collection unit, wherein the visual experimental unit is a key structural component for performing a rock visual acid etching experiment, the acid supply unit is used for supplying acid to the visual experimental unit, the pressure supply unit is used for supplying confining pressure to the visual experimental unit and simulating formation pressure, and the waste liquid collection unit is used for collecting waste acid after reaction.
The structural components are described and illustrated separately below.
According to the invention, the visual experiment unit comprises a protective frame 6, a visual rock plate cover 7, a visual rubber sleeve 10, a sealing cover 5, a liquid inlet port 3 and a liquid outlet port 12.
Fig. 4 shows a schematic structural diagram of a protective frame in a visual fractured rock acid etching experimental device according to an exemplary embodiment of the invention. As shown in fig. 4, the protection frame 6 includes a top plate, a bottom plate and two side plates disposed at two ends of the top plate and the bottom plate, wherein the two side plates are both provided with a first mounting opening 23 and the top plate is provided with a first water inlet 9. The protection frame 6 is used for protecting the visual slate cover 7 and the visual rubber sleeve 10 inside so as to prevent cracking under high pressure.
Fig. 5 shows a schematic structural diagram of a visual rock cover in the visual fractured rock acid etching experimental device according to an exemplary embodiment of the invention, and fig. 6 shows a schematic structural diagram of a visual rubber sleeve in the visual fractured rock acid etching experimental device according to an exemplary embodiment of the invention. As shown in fig. 5 and 6, the visual rock cover 7 can be inserted into the protective frame 6, and the top of the visual rock cover 7 is provided with a second water inlet 22 corresponding to the first water inlet 9; the visual rubber sleeve 10 is inserted into the visual rock cover 7, and an annular space is reserved between the visual rubber sleeve 10 and the visual rock cover 7. When the annular space is filled with water, confining pressure for simulating formation pressure can be provided for the rock plate, and simulation of different formation environments is realized. During the experiment, the crack-type rock plate is placed in the inner cavity of the visual rubber sleeve 10 to perform the acid liquor etching experiment.
Preferably, the visual rubber sleeve 10 is formed by splicing metal materials at two ends and a transparent rubber material in the middle, the metal materials at the two ends can prevent unstable sealing during installation and ensure the installation reliability, and the transparent rubber material can ensure the visualization of an experiment on one hand and the authenticity of simulation on the other hand; the visual rock plate cover 7 is made of high-strength transparent glass or transparent plastic, and the visual effect of the experiment is guaranteed while the strength is guaranteed.
In order to prevent water leakage, first sealing rings 11 are preferably arranged between the two ends of the visual rubber sleeve 10 and the sealing cover 5, and the first sealing rings 11 are sleeved on the two ends of the visual rubber sleeve 10 for sealing, and the structure can be shown in fig. 7. In addition, fig. 8 shows a schematic structural diagram of the combined components in fig. 4 to 7.
Fig. 9 shows a schematic structural diagram of a sealing cover in a visual crack type rock plate acid etching experimental device according to an exemplary embodiment of the invention. As shown in fig. 9, the sealing cover 5 is provided on the first mounting port 23 at both ends of the protective frame 6 and seals the annular space, and the sealing cover 5 is further provided with the second mounting port 24. The sealing covers 5 seal the visual experiment unit on two sides of the visual experiment unit, and feasibility of experiments is guaranteed.
Fig. 10 shows a schematic structural diagram of an inlet port in a visual fractured rock acid etching experimental device according to an exemplary embodiment of the invention, and fig. 11 shows a schematic structural diagram of an outlet port in the visual fractured rock acid etching experimental device according to an exemplary embodiment of the invention. As shown in fig. 10 and 11, the liquid inlet port 3 and the liquid outlet port 12 are respectively arranged on the second mounting port 24 of the sealing cover 5, and both the liquid inlet port 3 and the liquid outlet port 12 are communicated with the inner cavity of the visual rubber sleeve 10. Preferably, a second sealing ring 4 is arranged between the liquid inlet port 3, the liquid outlet port 12 and the sealing cover 5, the structure of the second sealing ring 4 is shown in fig. 12, and the second sealing ring is used for preventing water from leaking.
Specifically, a liquid inlet 25 of the liquid inlet port is arranged outside to be connected with the acid supply unit, and a liquid outlet 26 of the liquid inlet port is arranged inside to be communicated with the inner cavity of the visual rubber sleeve 10; similarly, the liquid inlet 27 of the liquid outlet port is arranged inside to communicate with the inner cavity of the visual rubber sleeve 10, and the liquid outlet of the liquid outlet port is arranged outside to communicate with the waste liquid collecting unit.
According to the invention, the acid supply unit is connected with the liquid inlet 25 of the liquid inlet port, as shown in fig. 1 to fig. 3, the acid supply unit in the invention comprises an acid storage tank 1, an acid injection pipe 19 and a advection pump 2, and the acid storage tank 1 is connected with the liquid inlet 25 of the liquid inlet port through the acid injection pipe 19 and the advection pump 2 arranged on the acid injection pipe 19. The acid storage tank 1 is used for containing preset acid liquid prepared in advance, the type and the concentration of the preset acid liquid can be adjusted according to experiment requirements, and in addition, the acid injection speed can be adjusted through the constant-current pump 2.
The pressure supply unit is connected with the second water inlet 22. Fig. 13 shows a schematic structural diagram of an acid supply unit in a visual crack type rock acid etching experimental apparatus according to an exemplary embodiment of the present invention, and as shown in fig. 13, the pressure supply unit includes a water storage tank 17, a booster pump 14, and a water injection pipe 20, the water storage tank 17 is connected to a second water inlet 22 through the booster pump 14 and the water injection pipe 20, and a rotary handle 15 and a pressure gauge 16 are further disposed on the booster pump 14. Wherein the water storage tank 17 is used for containing water for the booster pump, the booster pump 14 is used for providing high-pressure water into the annular space, the water in the booster pump can be squeezed and high pressure can be formed in the annular space by rotating the rotating handle 15 of the booster pump 14, the pressure can be read by the pressure gauge 16 of the booster pump 14, and the pressure can be adjusted.
The waste liquid collecting unit is connected with a liquid outlet of the liquid outlet port to collect waste acid after reaction, wherein the waste liquid collecting unit comprises an acid outlet pipe 21 and a waste liquid storage tank 13.
According to a preferred embodiment of the present invention, the experimental device of the present invention may further include a temperature control unit to control a reaction temperature at the time of the reaction. Specifically, the temperature control unit comprises a heating plate 8 and a temperature controller 18, the heating plate 8 is inserted in the protective frame 6 and is positioned on one side of the visual rubber sleeve 10 and the visual rock plate cover 7, and the temperature controller 18 is electrically connected with the heating plate 8 to realize the control of heating temperature and different experimental temperature conditions. However, the temperature control unit is only designed optimally, and the experimental apparatus of the present invention may not include the temperature control unit, for example, fig. 14 shows a schematic perspective view of a visual fractured rock acid etching experimental apparatus according to another exemplary embodiment of the present invention, in which the temperature control unit is not provided.
Therefore, the visual crack type rock plate acid liquor etching experimental device with the structure can be used for researching the etching condition of acid liquor on the crack type rock plate under the conditions of different formation pressures, acid liquor concentrations, acid injection speeds and even temperatures.
Meanwhile, the invention also provides a visual crack type rock plate acid liquor etching experimental method for carrying out the acid liquor etching experiment of the crack type rock plate by adopting the visual crack type rock plate acid liquor etching experimental device.
According to an exemplary embodiment of the present invention, the experimental method may include the steps of:
A. after the sealing cover is ensured to be sealed completely, the crack-shaped rock plate is placed into a visual rubber sleeve of the visual experiment unit, a liquid inlet port and a liquid outlet port are installed and connected with an acid supply unit, a pressure supply unit and a waste liquid collecting unit, and the visual crack-shaped rock plate acid liquid etching experiment device is ensured to be sealed integrally;
B. controlling a pressure supply unit to inject water into the annular space of the visual experiment unit to form high pressure until the experiment requirement is met;
C. controlling an acid supply unit to inject prepared preset acid liquid into the fractured rock slab of the visual experiment unit according to the preset acid injection speed of the experiment, wherein optionally the experiment temperature is adjusted to meet the experiment requirement by using a temperature control unit;
D. observing the flowing characteristics of the preset acid liquor and the etching condition of the rock plate through the visual rock plate cover and recording the phenomenon of the acid liquor etching experiment;
E. and (4) after the experiment is finished, relieving confining pressure, recovering acid liquor, taking out the crack-shaped rock plate for analysis, and using the cleaning device for the next time.
According to an embodiment of the present invention, the following steps may also be performed: before starting the experiment, checking whether the sealing cover is well sealed; putting the prepared rock plate with the cracks into a visual rubber sleeve; installing and fixing the liquid inlet port and the liquid outlet port and tightly attaching to the rock plate; checking whether the whole device is sealed; the rotary handle extrudes water in the booster pump to enter an annular space to form high pressure until the experiment requirement is met; pouring the prepared acid liquor into an acid storage tank; opening a temperature controller, adjusting the temperature to the temperature required by the experiment, and opening a constant-flow pump after the temperature of the experimental device reaches the temperature required by the experiment to adjust the acid injection speed to the speed required by the experiment; observing the flowing characteristics of the acid liquor and the etching condition of the rock plate through the visual rock plate cover, and recording the experimental phenomenon; after the test is finished, components such as a temperature controller and the like are closed, confining pressure is removed, and acid liquor is recovered; taking out the rock plate, and carrying out processing such as photographing, scanning electron microscope analysis and the like on the rock plate according to the experimental requirements; cleaning equipment and finishing experimental equipment.
In summary, the visual crack type rock plate acid etching experimental device and the experimental method provided by the invention have the following advantages: (1) the operation is simple; (2) the etching rule of acid liquor on the fractured reservoir can be researched under different stratum pressures, acid liquor concentrations and acid injection speeds; (3) the confining pressure is provided by a booster pump, so that the formation pressure can be simulated; (4) the flowing condition of the acid liquid and the etching rule of the rock plate can be visually observed.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (9)
1. A visual crack type rock acid liquid etching experimental device is characterized by comprising a visual experimental unit, an acid supply unit, a pressure supply unit and a waste liquid collecting unit,
the visual experiment unit comprises a protection frame, a visual rock plate cover, a visual rubber sleeve, a sealing cover, a liquid inlet port and a liquid outlet port, the protection frame comprises a top plate, a bottom plate and two side plates arranged at two ends of the top plate and the bottom plate, a first mounting port is formed in each of the two side plates, and a first water inlet is formed in the top plate; the visual rock plate cover is inserted into the protection frame, a second water inlet corresponding to the first water inlet is formed in the top of the visual rock plate cover, the visual rubber sleeve is inserted into the visual rock plate cover, an annular space is reserved between the visual rubber sleeve and the visual rock plate cover, and the visual rubber sleeve is formed by splicing metal materials at two ends and a transparent rubber material in the middle; the sealing cover is arranged on the first mounting openings at the two ends of the protection frame and seals the annular space, and a second mounting opening is also arranged on the sealing cover; the liquid inlet port and the liquid outlet port are respectively arranged on the second mounting port of the sealing cover, and are both communicated with the inner cavity of the visual rubber sleeve;
the acid supply unit is connected with a liquid inlet of the liquid inlet port, the pressure supply unit is connected with the second water inlet, and the waste liquid collecting unit is connected with a liquid outlet of the liquid outlet port.
2. The visual fractured rock acid etching experimental device of claim 1, wherein the fractured rock is placed in the inner cavity of the visual rubber sleeve for acid etching experiment.
3. The visual crack type rock acid etching experimental device according to claim 1, wherein first sealing rings are arranged between two ends of the visual rubber sleeve and the sealing cover, and the first sealing rings are sleeved on two ends of the visual rubber sleeve; and second sealing rings are arranged among the liquid inlet port, the liquid outlet port and the sealing cover.
4. The visual crack type rock acid etching experimental device according to claim 1, wherein the acid supply unit comprises an acid storage tank, an acid injection pipe and a constant flow pump, and the acid storage tank is connected with the liquid inlet of the liquid inlet port through the acid injection pipe and the constant flow pump arranged on the acid injection pipe.
5. The visual crack type rock acid liquor etching experimental device as claimed in claim 1, wherein the pressure supply unit comprises a water storage tank, a booster pump and a water injection pipe, the water storage tank is connected with the second water inlet through the booster pump and the water injection pipe, and a rotating handle and a pressure gauge are further arranged on the booster pump.
6. The visual fractured rock acid etching experimental device of claim 1, wherein the visual rock cover is made of high-strength transparent glass or transparent plastic, and the waste liquid collecting unit comprises an acid outlet pipe and a waste liquid storage tank.
7. The visual crack type rock acid etching experimental device as claimed in claim 1, further comprising a temperature control unit, wherein the temperature control unit comprises a heating plate and a temperature controller, the heating plate is inserted into the protection frame and located on one side of the visual rubber sleeve and the visual rock plate cover, and the temperature controller is connected with the heating plate.
8. A visual fractured rock acid etching experimental method is characterized in that the visual fractured rock acid etching experimental device of any one of claims 1 to 7 is adopted to perform acid etching experiments on fractured rocks.
9. The visual fractured rock acid etching experimental method according to claim 8, wherein the method comprises the following steps:
A. after the sealing cover is ensured to be sealed completely, the crack-shaped rock plate is placed into a visual rubber sleeve of the visual experiment unit, a liquid inlet port and a liquid outlet port are installed and connected with an acid supply unit, a pressure supply unit and a waste liquid collecting unit, and the visual crack-shaped rock plate acid liquid etching experiment device is ensured to be sealed integrally;
B. controlling a pressure supply unit to inject water into the annular space of the visual experiment unit to form high pressure until the experiment requirement is met;
C. controlling an acid supply unit to inject prepared preset acid liquid into the fractured rock slab of the visual experiment unit according to the preset acid injection speed of the experiment, wherein the method comprises the steps of firstly utilizing a temperature control unit to adjust the experiment temperature to meet the experiment requirement;
D. observing the flowing characteristics of the preset acid liquor and the etching condition of the rock plate through the visual rock plate cover and recording the phenomenon of the acid liquor etching experiment;
E. and (4) after the experiment is finished, relieving confining pressure, recovering acid liquor, taking out the crack-shaped rock plate for analysis, and using the cleaning device for the next time.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611046285.8A CN106437671B (en) | 2016-11-22 | 2016-11-22 | Visual crack type rock plate acid liquor etching experimental device and experimental method |
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| CN201611046285.8A CN106437671B (en) | 2016-11-22 | 2016-11-22 | Visual crack type rock plate acid liquor etching experimental device and experimental method |
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| CN106437671B true CN106437671B (en) | 2019-12-24 |
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| CN111272978B (en) * | 2020-02-26 | 2021-04-09 | 西南石油大学 | Evaluation of CO2Device and method for testing influence on flat acid rock reaction rate |
| CN113670204A (en) * | 2021-08-28 | 2021-11-19 | 西南石油大学 | Device and method for measuring acid liquor etching volume and proppant embedding depth |
| CN115749722B (en) * | 2022-11-03 | 2024-01-26 | 西南石油大学 | Novel high-temperature visual acid etching experimental device and method |
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