Shale seepage dynamic evolution law real-time visualization equipment

Abstract

The utility model discloses shale seepage dynamic evolution law real-time visualization equipment, and relates to the technical field of underground resource exploitation, and the shale seepage dynamic evolution law real-time visualization equipment comprises a seepage experiment device, a rotating platform and a scanner; the seepage experiment device is detachably mounted on the rotating platform and used for carrying out a seepage experiment on a sample, and the seepage experiment device comprises a sleeve, a first pressure head, a second pressure head, a first seal head and a second seal head; the scanner is used for scanning and imaging the sample according to a preset time interval; according to the shale seepage dynamic evolution law real-time visualization equipment, CT scanning can be conducted on the sample under the condition that confining pressure and water pressure are kept, real-time observation of the sample internal crack evolution law in the seepage test period is achieved, and the equipment has great significance in scientific guidance of shale gas well soaking time optimization design.

Description

Technical Field

[0001] The present application relates to the technical field of underground resource exploitation, and in particular, to a real-time visualization device for the dynamic evolution law of shale seepage flow. Background Art

[0002] Soaking the well is an important means to improve the productivity of shale oil and gas and reduce the production cost. The mechanical mechanism behind it may be in two aspects: on the one hand, it is the hydration of shale, and on the other hand, it is the subcritical propagation of fractures. Existing research has carried out shale fracturing fluid hydration experiments by means of experimental methods such as X-ray computed tomography scanning (abbreviated as CT scanning) and Magnetic Resonance Imaging (abbreviated as MRI). The research results have found that the hydration effect can improve the permeability of shale reservoirs and increase the productivity release of gas wells.

[0003] The above research all conducts CT scanning or nuclear magnetic resonance testing on the specimens after the hydration experiment. However, the hydraulic fractures have changed after the pore pressure is unloaded, and it is impossible to observe the dynamic evolution characteristics of the shale pore structure caused by the hydration effect in real time, and it is difficult to obtain the evolution law of the real-time permeability of shale during the hydraulic action process. Summary of the Utility Model

[0004] The present application aims to provide a real-time visualization device for the dynamic evolution law of shale seepage flow, aiming to solve the problem that it is difficult to obtain the evolution law of shale permeability during the hydraulic action process in the prior art.

[0005] The present application provides a real-time visualization device for the dynamic evolution law of shale seepage flow, including:

[0006] A seepage experiment device, a rotating platform and a scanner;

[0007] The seepage experiment device is detachably installed on the rotating platform, and the seepage experiment device includes a sleeve, a first pressing head, a second pressing head, a first sealing head and a second sealing head;

[0008] The inside of the sleeve has a cavity for accommodating the specimen. The first pressing head and the second pressing head are coaxially arranged inside the sleeve, and the first pressing head and the second pressing head respectively press against both ends of the specimen; a seepage chamber is provided at the axis of the first pressing head, a drainage chamber is provided at the axis of the second pressing head, and an annular confining pressure chamber is formed between the side wall of the specimen and the inner side wall of the sleeve; a sealing layer is provided on the outer periphery of the first pressing head, the specimen and the second pressing head;

[0009] The first sealing head is arranged at the first end of the sleeve and is sealed with the sleeve and the first pressure head at the same time. The first sealing head is provided with a confining pressure pressurization hole and an seepage pressure pressurization hole. The confining pressure pressurization hole is in communication with the confining pressure chamber, and the seepage pressure pressurization hole is in communication with the seepage pressure chamber.

[0010] The second sealing head is provided at the second end of the sleeve and is sealed with the sleeve and the second pressure head. The second sealing head is provided with a confining pressure drainage hole and a seepage pressure drainage hole. The confining pressure drainage hole is communicated with the confining pressure chamber, and the seepage pressure drainage hole is communicated with the drainage chamber.

[0011] The scanner is used to scan and image the sample at preset time intervals.

[0012] Optionally, the sealing layer includes a heat shrinkable film, and the heat shrinkable film is tightly wrapped around the first press head, the sample and the second press head.

[0013] Optionally, a plurality of annular grooves are provided on the outer periphery of the first pressing head and the second pressing head, and a sealing ring is provided in the groove, and the sealing ring is pressed between the first pressing head and the sealing layer or between the second pressing head and the sealing layer.

[0014] Optionally, the first head includes a first head body and an upper cover that are detachably connected, and the seepage pressure hole is arranged in the upper cover; a rotary joint is provided in the upper cover, and the rotary joint is rotatably connected to the seepage pressure hole.

[0015] Optionally, the second head includes a second head body and a drainage sleeve, and the drainage sleeve is rotatably connected to the second head body; the seepage drainage hole is arranged on the drainage sleeve, and an annular water channel is circumferentially arranged inside the drainage sleeve, and the annular water channel is connected to the seepage drainage hole and the drainage chamber at the same time.

[0016] Optionally, an exhaust hole is further provided in the first head, and the exhaust hole is communicated with the confining pressure chamber.

[0017] Optionally, the material of the sleeve, the first pressing head and the second pressing head includes polyetheretherketone.

[0018] Optionally, the first end cap is fixed to the first end of the sleeve by a first clamp, and the second end cap is fixed to the second end of the sleeve by a second clamp.

[0019] Optionally, a clamping sleeve is provided at one end of the second head away from the sleeve, one end of the clamping sleeve is connected to the second head, and the other end of the clamping sleeve is detachably connected to the rotating platform.

[0020] Optionally, a water receiving tray is provided on the clamping sleeve.

[0021] Beneficial effects:

[0022] The present application provides a real-time visualization device for the dynamic evolution of shale seepage, comprising a seepage experimental device, a rotating platform and a scanner. The seepage experimental device can be detachably mounted on the rotating platform and can perform a seepage test on a sample. The scanner can scan and image the sample at preset time intervals. The real-time visualization device for the dynamic evolution of shale seepage provided by the present application can perform CT scanning on the sample while maintaining confining pressure and water pressure, thereby realizing real-time observation of the evolution of cracks inside the sample during the seepage test. This is of great significance for exploring the dynamic evolution of shale permeability and the spatiotemporal evolution of shale micropore structure under a well-insulating environment, thereby scientifically guiding the optimization design of shale gas well-insulating time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0024] Figure 1 This is a schematic structural diagram of a device for real-time visualization of the dynamic evolution of shale seepage proposed in one embodiment of the present application;

[0025] Figure 2 It is a structural schematic diagram of a seepage experimental device in a real-time visualization device for the dynamic evolution of shale seepage proposed in one embodiment of the present application.

[0026] Description of reference numerals:

[0027] 1. Rotating platform; 2. Scanner; 3. Seepage experimental device; 4. Sample;

[0028] 301, sleeve; 302, first pressure head; 3021, groove; 303, second pressure head; 304, first head; 3041, first head body; 3042, upper cover; 305, second head; 3051, second head body; 3052, drainage sleeve;

[0029] 311. Osmotic pressure chamber; 312. Drainage chamber; 313. Confining pressure chamber;

[0030] 321, seepage pressure hole; 322, confining pressure hole; 323, seepage pressure drainage hole; 324, confining pressure drainage hole; 325, exhaust hole;

[0031] 331. First channel; 332. Second channel; 333. Third channel; 334. Fourth channel; 335. Fifth channel; 336. Annular water channel

[0032] 341. First hoop; 342. Second hoop; 35. Rotary joint; 36. Clamping sleeve; 37. Water receiving tray Detailed implementation mode

[0033] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present application

[0034] In the related art, when carrying out shale fracturing fluid hydration experiments by means of CT scanning or nuclear magnetic resonance, etc., the specimens are subjected to CT scanning or nuclear magnetic resonance tests after the hydration test. However, the hydraulic fractures have changed after the pore pressure is unloaded, and it is impossible to observe the dynamic evolution characteristics of the shale pore structure caused by the hydration effect in real time, and it is difficult to obtain the evolution law of the real-time permeability of the shale during the shale hydraulic action process

[0035] In view of this, an embodiment of the present application proposes a real-time visualization device for the dynamic evolution law of shale seepage flow

[0036] See Figure 1 and Figure 2 , a real-time visualization device for the dynamic evolution law of shale seepage flow, including a seepage experiment device 3, a rotating platform 1 and a scanner 2; the seepage experiment device 3 is detachably installed on the rotating platform 1, and the seepage experiment device 3 includes a sleeve 301, a first press head 302, a second press head 303, a first head 304 and a second head 305

[0037] The inside of the sleeve 301 has a cavity for accommodating the specimen 4. The first press head 302 and the second press head 303 are coaxially arranged inside the sleeve 301, and the first press head 302 and the second press head 303 are respectively pressed against both ends of the specimen 4; a seepage pressure chamber 311 is provided at the axis of the first press head 302, a drainage chamber 312 is provided at the axis of the second press head 303, and an annular confining pressure chamber 313 is formed between the side wall of the specimen 4 and the inner side wall of the sleeve 301; sealing layers are provided on the outer peripheries of the first press head 302, the specimen 4 and the second press head 303

[0038] The first head 304 is disposed at the first end of the sleeve 301 and is simultaneously hermetically connected to the sleeve 301 and the first press head 302. A confining pressure pressurizing hole 322 and a seepage pressure pressurizing hole 321 are provided in the first head 304. The confining pressure pressurizing hole 322 communicates with the confining pressure chamber 313, and the seepage pressure pressurizing hole 321 communicates with the seepage pressure chamber 311. The second head 305 is disposed at the second end of the sleeve 301 and is simultaneously hermetically connected to the sleeve 301 and the second press head 303. A confining pressure drainage hole 324 and a seepage pressure drainage hole 323 are provided in the second head 305. The confining pressure drainage hole 324 communicates with the confining pressure chamber 313, and the seepage pressure drainage hole 323 communicates with the drainage chamber 312.

[0039] The scanner 2 is configured to scan and image the specimen 4 at a preset time interval.

[0040] Specifically, as Figure 2 shown, the inside of the sleeve 301 of the seepage experiment device 3 is hollow. The outer diameters of the first press head 302, the second press head 303, and the specimen 4 are all smaller than the inner diameter of the sleeve 301. As an example, in this embodiment, the outer diameter of the specimen 4 is about 25 mm, and the inner diameter of the sleeve 301 is about 35 mm. The first press head 302 and the second press head 303 are coaxially arranged inside the sleeve 301 and respectively press against the upper and lower ends of the specimen 4. A through hole is axially formed at the axis of the first press head 302 to form a seepage pressure chamber 311, and a through hole is axially formed at the axis of the second press head 303 to form a drainage chamber 312. There is a gap between the side wall of the specimen 4 and the inner wall of the sleeve 301, and this gap forms an annular confining pressure chamber 313.

[0041] The first head 304 is installed at the upper end of the sleeve 301. It is simultaneously hermetically connected to the sleeve 301 and the first press head 302 and is used to block the upper end of the sleeve 301. A seepage pressure pressurizing hole 321 is provided at the center of the top of the first head 304. The seepage pressure pressurizing hole 321 communicates with the seepage pressure chamber 311 through a first channel 331. A seepage pressure inlet water pipe is connected to the seepage pressure pressurizing hole 321, and water can be injected into the seepage pressure chamber 311 through the seepage pressure pressurizing hole 321 to apply water pressure to the specimen 4. A confining pressure pressurizing hole 322 is provided on the side of the first head 304. The confining pressure pressurizing hole 322 communicates with the confining pressure chamber 313 through a second channel 332. A confining pressure inlet water pipe and a hand pump are connected to the confining pressure pressurizing hole 322, and water can be injected into the confining pressure chamber 313 through the confining pressure pressurizing hole 322 to apply confining pressure to the specimen 4.

[0042] The second head 305 is installed at the lower end of the sleeve 301, and it is hermetically connected to the sleeve 301 and the second press head 303 at the same time, and is used to block the lower end of the sleeve 301. An osmotic pressure drainage hole 323 is provided in the second head 305, and the osmotic pressure drainage hole 323 is communicated with the drainage chamber 312 through a third channel 333. An osmotic pressure drainage pipe is connected to the osmotic pressure drainage hole 323. After the experiment is over, the water in the drainage chamber 312 can be discharged outwards through the osmotic pressure drainage hole 323. A confining pressure drainage hole 324 is also provided in the second head 305, and the confining pressure drainage hole 324 is communicated with the confining pressure chamber 313 through a fourth channel 334. The confining pressure drainage hole 324 is connected to a confining pressure drainage pipe. After the experiment is over, the water in the confining pressure chamber 313 can be discharged outwards through the confining pressure drainage hole 324.

[0043] Sealing layers are provided on the outer peripheries of the first press head 302, the specimen 4 and the second press head 303. By providing the sealing layers, the inner osmotic pressure chamber 311 and drainage chamber 312 can be isolated from the outer confining pressure chamber 313, avoiding the mixing of the confining pressure water and the osmotic pressure water and interfering with the seepage experiment, and ensuring the accuracy of the experiment.

[0044] During use, the seepage experiment device 3 is fixed to the CT rotating platform 1. While the seepage experiment is being carried out, the CT scanner 2 scans and images the specimen 4 at regular intervals. During this period, the confining pressure and water pressure are not unloaded, and the internal crack evolution law of the specimen 4 during the seepage experiment can be observed in real time.

[0045] It can be understood that valves can be provided at the confining pressure pressurizing hole 322, the osmotic pressure pressurizing hole 321, the confining pressure drainage hole 324 and the osmotic pressure drainage hole 323, so as to correspondingly control the opening or closing state of each hole.

[0046] Optionally, the sealing layer includes a heat shrinkable film, and the heat shrinkable film tightly wraps around the outer peripheries of the first press head 302, the specimen 4 and the second press head 303.

[0047] Specifically, in this embodiment, the sealing layer is a heat shrinkable film. The heat shrinkable film can shrink when heated and thus tightly cover the outer peripheries of the first press head 302, the specimen 4 and the second press head 303, making the first press head 302, the specimen 4 and the second press head 303 connected as a whole, avoiding the water in the confining pressure chamber 313 from flowing into the osmotic pressure chamber 311 and the drainage chamber 312 from the joints between the first press head 302, the specimen 4 and the second press head 303. Similarly, it can also avoid the water in the osmotic pressure chamber 311 and the drainage chamber 312 from flowing out to the confining pressure chamber 313, ensuring the accuracy of the seepage experiment.

[0048] Optionally, the outer periphery of the first pressing head 302 and the second pressing head 303 are both provided with a plurality of annular grooves 3021, and a sealing ring is provided in the groove 3021, and the sealing ring is pressed between the first pressing head 302 and the sealing layer or between the second pressing head 303 and the sealing layer.

[0049] In order to further improve the sealing performance of the sealing layer, an annular groove 3021 is provided on the outer periphery of the first pressure head 302 and the second pressure head 303. Figure 2 As shown, in this embodiment, three grooves 3021 are provided at the lower end of the first pressing head 302, and three grooves 3021 are provided at the upper end of the second pressing head 303. A sealing ring is embedded in the groove 3021, and the sealing ring is pressed between the first pressing head 302 and the sealing layer or between the second pressing head 303 and the sealing layer, which can further ensure that the sealing layer is tightly wrapped around the first pressing head 302, the sample 4 and the second pressing head 303, thereby improving the sealing performance.

[0050] Optionally, the first head 304 includes a first head body 3041 and an upper cover 3042 that are detachably connected, and the seepage pressure hole 321 is arranged in the upper cover 3042; a rotary joint 35 is provided in the upper cover 3042, and the rotary joint 35 is rotatably connected to the seepage pressure hole 321.

[0051] Specifically, in this embodiment, the first end cap 304 includes a first end cap body 3041 and an upper cover 3042. The upper cover 3042 is bolted to the first end cap body 3041. A seepage pressure hole 321 is located at the center of the upper cover 3042. A rotary joint 35 is rotatably mounted within the seepage pressure hole 321. The rotary joint 35 is used to connect to the seepage pressure inlet pipe. Since the seepage experimental device 3 rotates with the rotating platform 1 during the experiment, and the rotary joint 35 and the upper cover 3042 can rotate relative to each other, the seepage pressure inlet pipe does not rotate with the device, ensuring the stability and neatness of the pipeline during the experiment.

[0052] Optionally, the second head 305 includes a second head body 3051 and a drainage sleeve 3052, and the drainage sleeve 3052 is rotatably connected to the second head body 3051; the seepage drainage hole 323 is arranged on the drainage sleeve 3052, and the interior of the drainage sleeve 3052 is provided with an annular water channel 336 along the circumference, and the annular water channel 336 is connected to the seepage drainage hole 323 and the drainage chamber 312 at the same time.

[0053] Specifically, in this embodiment, the second head 305 includes a second head body 3051 and a drainage sleeve 3052. The drainage sleeve 3052 is mounted on the bottom end of the second head body 3051 and is rotatably connected thereto. An annular water channel 336 is arranged inside the drainage sleeve 3052 along its circumference. The annular water channel 336 is communicated with the third channel 333 inside the second head body 3051. The seepage drainage hole 323 is arranged on the side of the drainage sleeve 3052 and is communicated with the annular water channel 336. Therefore, the water in the drainage chamber 312 can be discharged outward through the third channel 333, the annular water channel 336 and the seepage drainage hole 323 in sequence.

[0054] Since the seepage experiment device 3 rotates with the rotating platform 1 during the experiment, and the drainage sleeve 3052 and the second head body 3051 can rotate relative to each other, the seepage pressure drainage pipe will not rotate with the device, ensuring the stability and cleanliness of the pipeline during the experiment.

[0055] Optionally, an exhaust hole 325 is further provided in the first sealing head 304 , and the exhaust hole 325 is communicated with the confining pressure chamber 313 .

[0056] like Figure 2 As shown, an exhaust hole 325 is also provided in the first head 304. Specifically, in this embodiment, the exhaust hole 325 is provided in the first head body 3041, and is located on the opposite side of the confining pressure pressurization hole 322. A fifth channel 335 is opened inside the first head body 3041 to connect the exhaust hole 325 with the confining pressure chamber 313.

[0057] To avoid the effects of air in the cavity when applying confining pressure, the air must be vented before applying confining pressure. The medium used to apply confining pressure is water. During venting, water is injected into the confining pressure chamber 313 through the confining pressure injection hole 322. When water flows out of the vent hole 325, venting is complete.

[0058] Optionally, the material of the sleeve 301 , the first pressing head 302 and the second pressing head 303 includes polyetheretherketone.

[0059] Polyetheretherketone (PEEK) is a special engineering plastic with high mechanical strength and ease of processing. It is also transparent to CT rays. In this embodiment, the sleeve 301, first indenter 302, and second indenter 303 are all made of PEEK, ensuring that the CT scanner 2 can smoothly scan the specimen 4, thereby ensuring real-time observation.

[0060] Optionally, the first end cap 304 is locked and fixed to the first end of the sleeve 301 via a first clamp 341 , and the second end cap 305 is locked and fixed to the second end of the sleeve 301 via a second clamp 342 .

[0061] To further improve the connection reliability of the device, in this embodiment, the upper ends of the first head 304 and the sleeve 301 are further locked and fixed using the first hoop 341, and the lower ends of the second head 305 and the sleeve 301 are further locked and fixed using the second hoop 342. Specifically, annular grooves are provided circumferentially at the upper end of the sleeve 301 and the first head 304. The first hoop 341 includes two relatively arranged semi-ring structures, and the two ends of the semi-ring structures are bent to form mounting ears. During installation, the two semi-ring structures are snapped into the grooves at the upper end of the sleeve 301 and the first head 304, and bolts are used to pass through the two mounting ears at the same end and lock them, thus realizing the connection and fixation of the first head 304 and the sleeve 301. Similarly, the second hoop 342 can also adopt the same structure and installation method as the first hoop 341, which will not be elaborated here.

[0062] Optionally, a clamping sleeve 36 is provided at one end of the second head 305 away from the sleeve 301. One end of the clamping sleeve 36 is connected to the second head 305, and the other end of the clamping sleeve 36 is detachably connected to the rotary platform 1.

[0063] As Figure 2 shown, in this embodiment, the clamping sleeve 36 is connected to the bottom end of the second head body 3051. The clamping sleeve 36 and the second head body 3051 can be fixedly connected by bolts. By providing the clamping sleeve 36, the seepage experiment device 3 can be installed on the rotary platform 1 to perform CT scanning while maintaining the confining pressure and water pressure.

[0064] Optionally, a water receiving tray 37 is provided on the clamping sleeve 36.

[0065] Specifically, the water receiving tray 37 is sleeved on the outer periphery of the clamping sleeve 36. The diameter of the water receiving tray 37 is larger than the maximum diameter of the seepage experiment device 3. The water receiving tray 37 can receive the water droplets leaking from the joint between the seepage drainage hole 323 and the seepage drainage pipe, so as to prevent the leaked water droplets from dripping onto the rotary platform 1, which helps to keep the tabletop clean and tidy and avoid damage to the CT equipment caused by the leaked water.

[0066] The process of performing real-time scanning and observation using the shale seepage dynamic evolution law real-time visualization device provided in the embodiment of the present application is as follows:

[0067] First, assemble the seepage experiment device 3. Connect the first pressure head 302, the specimen 4, and the second pressure head 303 in sequence, and tightly wrap them with heat shrink film on the periphery to connect the three into one body. Install the connected first pressure head 302, specimen 4, and second pressure head 303 into the sleeve 301. Use the first end cap 304 to connect the first pressure head 302 and the sleeve 301 at the same time, and use the first hoop 341 to lock the first end cap 304 and the sleeve 301. Use the second end cap 305 to connect the second pressure head 303 and the sleeve 301 at the same time, so that the first pressure head 302 and the second pressure head 303 compress the specimen 4, and then use the second hoop 342 to lock the second end cap 305 and the sleeve 301.

[0068] Open the exhaust hole 325, close the confining pressure drainage hole 324, and inject water into the confining pressure chamber 313 through the confining pressure pressurizing hole 322. When water overflows at the exhaust hole 325, it indicates that the exhaust is completed. Then close the exhaust hole 325. At this time, the confining pressure chamber 313 is filled with water. Connect a hand pump at the confining pressure pressurizing hole 322 and charge a confining pressure less than 30 MPa, such as 25 MPa, into the confining pressure chamber 313. During this period, an accumulator can be connected to maintain the stability of the confining pressure.

[0069] Install the seepage experiment device 3 on the rotating platform 1 using the clamping sleeve 36.

[0070] Close the osmotic pressure drainage hole 323, inject water into the osmotic pressure chamber 311 through the osmotic pressure pressurizing hole 321 and charge a water pressure less than the confining pressure value, such as 20 MPa, and keep the water pressure stable.

[0071] The scanner 2 scans and images the specimen 4 at a set time interval, for example, once every two days.

[0072] The real-time visualization device for the dynamic evolution law of shale seepage provided by the embodiment of the present application can perform CT scanning on the specimen while maintaining the confining pressure and water pressure, and realize the real-time observation of the internal crack evolution law of the specimen during the seepage experiment. It is of great significance for exploring the dynamic evolution law of shale permeability and the spatio-temporal evolution law of shale micropore structure in the shut-in well environment, so as to scientifically guide the optimization design of the shut-in time of shale gas wells.

[0073] It should be noted that the various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0074] It should also be noted that in this text, the orientation or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. This is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. In addition, relative terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations, nor can they be construed as indicating or implying relative importance. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or terminal device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or terminal device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article or terminal device comprising the element.

[0075] The technical solutions provided in this application have been introduced in detail above. Specific examples are used in this text to elaborate on the principles and implementation manners of this application. The description of the above embodiments is only for helping to understand this application, and the content of this specification should not be construed as a limitation to this application. At the same time, for those of ordinary skill in the art, according to this application, there will be various forms of changes in the specific implementation manners and application scopes. It is not necessary and impossible to enumerate all the implementation manners here, and the obvious changes or variations derived therefrom are still within the protection scope of this application.

Claims

1. A real-time visualization device for the dynamic evolution law of shale seepage flow, characterized in that Comprising: A seepage experiment device, a rotating platform, and a scanner; The seepage experiment device is detachably mounted on the rotating platform. The seepage experiment device includes a sleeve, a first press head, a second press head, a first head, and a second head; The interior of the sleeve has a cavity for accommodating a specimen. The first press head and the second press head are coaxially arranged inside the sleeve, and the first press head and the second press head respectively press against both ends of the specimen. An osmotic pressure chamber is provided at the axis of the first press head, a drainage chamber is provided at the axis of the second press head, and an annular confining pressure chamber is formed between the side wall of the specimen and the inner side wall of the sleeve. A sealing layer is provided on the outer periphery of the first press head, the specimen, and the second press head; The first head is provided at the first end of the sleeve and is simultaneously sealed and connected to the sleeve and the first press head. The first head is provided with a confining pressure pressurizing hole and an osmotic pressure pressurizing hole. The confining pressure pressurizing hole communicates with the confining pressure chamber, and the osmotic pressure pressurizing hole communicates with the osmotic pressure chamber; The second head is provided at the second end of the sleeve and is simultaneously sealed and connected to the sleeve and the second press head. The second head is provided with a confining pressure drainage hole and an osmotic pressure drainage hole. The confining pressure drainage hole communicates with the confining pressure chamber, and the osmotic pressure drainage hole communicates with the drainage chamber; The scanner is used to perform scanning imaging on the specimen at preset time intervals.

2. The real-time visualization device for the dynamic evolution law of shale seepage according to claim 1, wherein: The sealing layer includes a heat-shrinkable film, and the heat-shrinkable film tightly wraps around the outer periphery of the first press head, the specimen, and the second press head.

3. The real-time visualization device for the dynamic evolution law of shale seepage according to claim 1, wherein: A plurality of annular grooves are provided on the outer peripheries of the first press head and the second press head, and sealing rings are provided in the grooves. The sealing rings are pressed between the first press head and the sealing layer or between the second press head and the sealing layer.

4. The real-time visualization device for the dynamic evolution law of shale seepage according to claim 1, wherein: The first head includes a first head body and an upper cover that are detachably connected, and the osmotic pressure pressurizing hole is provided in the upper cover; A rotary joint is provided in the upper cover, and the rotary joint is rotatably connected in the osmotic pressure pressurizing hole.

5. The real-time visualization device for the dynamic evolution law of shale seepage according to claim 1, wherein: The second head includes a second head body and a drainage sleeve, and the drainage sleeve is rotatably connected to the second head body; The osmotic pressure drainage hole is provided on the drainage sleeve, and an annular water channel is provided along the circumferential direction inside the drainage sleeve. The annular water channel communicates with the osmotic pressure drainage hole and the drainage chamber at the same time.

6. The real-time visualization device for the dynamic evolution law of shale seepage according to claim 1, wherein: An exhaust hole is further provided in the first head, and the exhaust hole communicates with the confining pressure chamber.

7. The real-time visualization device for the dynamic evolution law of shale seepage according to claim 1, wherein: The materials of the sleeve, the first punch head and the second punch head include polyetheretherketone.

8. The real-time visualization device for the dynamic evolution law of shale seepage flow according to claim 1, wherein: The first head and the first end of the sleeve are locked and fixed by a first hoop, and the second head and the second end of the sleeve are locked and fixed by a second hoop.

9. The real-time visualization device for the dynamic evolution law of shale seepage flow according to claim 1, wherein: A clamping sleeve is arranged at one end of the second head away from the sleeve. One end of the clamping sleeve is connected to the second head, and the other end of the clamping sleeve is detachably connected to the rotating platform.

10. The real-time visualization device for the dynamic evolution law of shale seepage flow according to claim 9, wherein: A water receiving tray is arranged on the clamping sleeve.

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