CN116124673A - Three-dimensional seepage test structure and three-dimensional permeability real-time test system for deep rock - Google Patents
Three-dimensional seepage test structure and three-dimensional permeability real-time test system for deep rock Download PDFInfo
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- CN116124673A CN116124673A CN202310149351.8A CN202310149351A CN116124673A CN 116124673 A CN116124673 A CN 116124673A CN 202310149351 A CN202310149351 A CN 202310149351A CN 116124673 A CN116124673 A CN 116124673A
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- 238000012360 testing method Methods 0.000 title claims abstract description 38
- 239000011435 rock Substances 0.000 title claims abstract description 31
- 230000035699 permeability Effects 0.000 title claims abstract description 23
- 239000012530 fluid Substances 0.000 claims abstract description 44
- 230000035515 penetration Effects 0.000 claims abstract description 13
- 238000007789 sealing Methods 0.000 claims description 69
- 239000000523 sample Substances 0.000 claims description 60
- 238000002347 injection Methods 0.000 claims description 16
- 239000007924 injection Substances 0.000 claims description 16
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 14
- 238000001764 infiltration Methods 0.000 description 4
- 230000008595 infiltration Effects 0.000 description 4
- 239000012466 permeate Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000003032 molecular docking Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/14—Sealings between relatively-stationary surfaces by means of granular or plastic material, or fluid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
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Abstract
The invention relates to a deep rock three-way seepage test structure and a three-dimensional permeability real-time test system, which comprise 6 pressure heads and seepage systems, wherein the 6 pressure heads are positioned in the X, Y, Z axial direction in pairs; the 6 pressure heads are respectively used for contacting with the sample from six directions, a plurality of penetration holes are arranged at one end of each pressure head facing the sample, and a seepage system of a seepage fluid channel communicated with the penetration holes is arranged in each pressure head and comprises three seepage inlet pipes and three seepage outlet pipes; the three seepage inflow pipes are respectively connected with a seepage fluid channel of one pressure head in the X, Y, Z axial direction; the three seepage pipes are respectively connected with the seepage fluid channel of the other pressure head in the X, Y, Z axial direction. The two pressure heads of each shaft can form a seepage passage in the direction, and can be used for real-time monitoring of three-way permeability; this unique three-way seal structure of application can make 12 edges of sample seal each other, isolated sample marginal fluid circulation each other, can improve the accuracy of three-way permeability test.
Description
Technical Field
The invention relates to the technical field of rock mechanics and engineering, in particular to a deep rock three-way seepage test structure and a three-dimensional permeability real-time test system.
Background
China is in the industrialized and town development acceleration stage, the demand for resources is increasing, and the resources in the shallow part of the earth are gradually exhausted. In the deep field, deep sea field and deep space field, a large amount of resources and energy are reserved, so that the deep field is gradually shifted. However, deep rocks are in extremely complex seepage and temperature fields. The deep rock faces a complex mechanical environment, so that related engineering implementation faces a huge test, and the development of the physical and mechanical test of the deep rock is of great significance.
The test of the permeation behavior of gas or water in rock is of great importance for engineering practice and industrial safety. Existing rock permeability testing systems often only can test permeability in a certain fixed direction (vertical direction), while actual engineering reservoir rock mass is a three-way seepage field. Therefore, the three-way seepage experimental system is urgently required to break through.
Disclosure of Invention
The application provides a deep rock three-dimensional seepage test structure and three-dimensional permeability real-time test system for solving the problems.
The application is realized by the following technical scheme:
the deep rock three-way seepage test structure comprises 6 pressure heads and a seepage system, wherein the 6 pressure heads are located in the X-axis direction, the Y-axis direction and the Z-axis direction in pairs; the 6 pressure heads are respectively used for contacting with the sample from six directions, a plurality of penetration holes are arranged at one end of each pressure head facing the sample, a seepage fluid channel is arranged in each pressure head, and the seepage fluid channel is communicated with the penetration holes;
the seepage system comprises three seepage inflow pipes and three seepage outflow pipes; the three seepage inflow pipes are respectively connected with one pressure head in the X-axis direction, one pressure head in the Y-axis direction and one seepage fluid channel of one pressure head in the Z-axis direction; the three seepage pipes are respectively connected with the other pressure head in the X-axis direction, the other pressure head in the Y-axis direction and the seepage fluid channel of the other pressure head in the Z-axis direction.
Optionally, the three seepage inflow pipes are connected with the plunger pump through a 4-way valve.
In particular, valves are respectively arranged on the three seepage inflow pipes and the three seepage outflow pipes.
Optionally, the pressure head comprises a pressure head body and a penetration cushion block, wherein the front end of the pressure head body is provided with a rectangular convex part protruding forwards, the front end surface of the rectangular convex part is provided with a rectangular caulking groove which is integrally manufactured, and the penetration cushion block is embedded in the rectangular caulking groove; a plurality of permeation holes are uniformly arranged on the permeation cushion block, and the dry permeation holes penetrate through the permeation cushion block front and back; the seepage fluid channel is arranged in the pressure head body, one end of the seepage fluid channel is communicated with the rectangular caulking groove, and the other end of the seepage fluid channel penetrates through the side face of the pressure head body.
Specifically, the 6 pressure heads are connected together by 12 elastic sheets, and the periphery of each pressure head is connected with the 4 pressure heads on the periphery through one elastic sheet.
The real-time testing system for the three-dimensional permeability of the deep rock adopts the three-dimensional seepage testing structure of the deep rock, wherein an annular sealing groove is formed in the edge of one end, facing to a sample, of the pressure head, and a plurality of seepage holes are formed in the inner periphery of the annular sealing groove; and a sealing fluid injection channel is arranged in the pressure head, one end of the sealing fluid injection channel is communicated with the annular sealing groove, and the other end of the sealing fluid injection channel penetrates through the outer surface of the pressure head body.
Particularly, the real-time testing system for the three-dimensional permeability of the deep rock further comprises the hydraulic sealing system, wherein the hydraulic sealing system comprises a sealing inlet pipe, 6 sealing outlet pipes and a flow dividing assembly, the flow dividing assembly comprises 1 inlet path and 6 outlet paths, the 6 outlet paths are respectively connected with one sealing outlet pipe, and the 1 inlet path is connected with a high-pressure plunger pump through the sealing inlet pipe; the 6 sealing outlet pipes are respectively connected with the outer end of the sealing fluid injection channel of one pressure head.
The sample fixture comprises a rigid outer cube frame and a flexible inner cube frame, wherein the rigid outer cube frame and the flexible inner cube frame are respectively provided with 12 frame edges, 6 faces of the rigid outer cube frame and the flexible inner cube frame are respectively rectangular frames, and 12 outer edge angle positions of the flexible inner cube frame are attached to 12 inner edge angles of the rigid outer cube frame;
the flexible inner cube frame can be internally filled with cube samples, and one ends of the 6 pressure heads, which are used for being contacted with the samples, can respectively extend into the sample fixture from frame openings in 6 directions of the sample fixture; each surface of the flexible inner cube frame is provided with an integrally manufactured annular flange which is matched with the annular sealing groove of the pressure head; the annular sealing groove of the pressure head is internally provided with an annular sealing strip, and the annular sealing strip is provided with an annular groove matched with the annular flange.
The device comprises a flexible inner cube frame, a cube sample, a sample clamp, a flexible inner cube frame, a flexible outer cube frame, a flexible inner cube frame and a flexible outer cube frame, wherein one end of each of the 6 pressure heads, which is used for being contacted with the sample, extends into the sample clamp to be contacted with 6 surfaces of the cube sample respectively; the annular flanges in 6 directions of the flexible inner cube frame are correspondingly inserted into annular grooves of the annular sealing strips of the 6 pressure heads; the front end face of the pressure head is provided with an acoustic emission probe, an ultrasonic probe, a heat flow probe and a temperature sensing probe.
In particular, the 12 inner corner locations of the flexible inner cube frame have a right angle edge configuration that fits the corners of the cube sample.
Compared with the prior art, the application has the following beneficial effects:
1,6 pressure heads of the deep rock three-way seepage test structure are arranged in the X-axis direction, the Y-axis direction and the Z-axis direction in pairs, and two pressure heads of each shaft can form a seepage passage in the direction and can be used for real-time monitoring of three-way permeability; the application can also be used for seepage experiments in any inlet and outlet directions.
2, this application unique three-way seal structure can make 12 edges of sample seal each other, and isolated sample marginal fluid circulates each other, can improve the accuracy of three-way permeability test.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the present application and are incorporated in and constitute a part of this application, illustrate embodiments of the invention.
FIG. 1 is a three-dimensional view of a deep rock three-dimensional permeability real-time testing system in an embodiment;
FIG. 2 is a front view of a real-time testing system for three-dimensional permeability of deep rock in an embodiment;
FIG. 3 is a cross-sectional view at A-A in FIG. 2;
FIG. 4 is a cross-sectional view at B-B in FIG. 2;
FIG. 5 is a cross-sectional view at C-C in FIG. 2;
FIG. 6 is a three-dimensional view of an elastically sealed pressure cell in an embodiment;
FIG. 7 is a cross-sectional view of an elastic sealing pressure cell in an embodiment;
FIG. 8 is a three-dimensional view of the embodiment with 6 rams docked with the sample holder;
FIG. 9 is a front view of the embodiment with 6 rams docked with the sample holder;
FIG. 10 is a cross-sectional view taken at D-D of FIG. 9;
FIG. 11 is a cross-sectional view taken at E-E of FIG. 9;
FIG. 12 is a three-dimensional view of a press head in an embodiment;
FIG. 13 is a cross-sectional view of a press head in an embodiment;
FIG. 14 is a three-dimensional view of a sample holder in an embodiment;
FIG. 15 is a cross-sectional view of a sample holder in an embodiment;
FIG. 16 is a three-dimensional view of a flexible inner cube frame in an embodiment;
fig. 17 is a cross-sectional view of a flexible inner cube frame in an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments. It will be apparent that the described embodiments are some, but not all, of the embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without collision. It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or directions or positional relationships conventionally put in place when the inventive product is used, or directions or positional relationships conventionally understood by those skilled in the art are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1 to 5, the real-time testing system for three-dimensional permeability of deep rock disclosed in this embodiment includes an elastic sealing pressure cell 100, a seepage system and a hydraulic sealing system 300.
The seepage system comprises three seepage inflow pipes 202, three seepage outflow pipes 201 and a plunger pump (not shown in the figure), wherein the three seepage inflow pipes 202 are connected with the plunger pump through 4-way valves (not shown in the figure) to form a 1-in 3-out effect. Valves 203 are respectively arranged on the three seepage inflow pipes 202 and the three seepage outflow pipes 201.
The outlets of the three seepage pipes 201 are connected with a flowmeter, so that the outflow flow of the fluid can be monitored in real time.
The hydraulic sealing system 300 comprises a sealed inlet pipe 301, 6 sealed outlet pipes 302, a diversion assembly 303 and a high-pressure plunger pump (not shown in the figure), wherein the diversion assembly 303 is provided with 1 inlet path and 6 outlet paths, the 6 outlet paths are respectively connected with one sealed outlet pipe 302, the 1 inlet path is connected with the high-pressure plunger pump through the sealed inlet pipe 301, and the high-pressure plunger pump can provide 60MPa sealing pressure.
In one possible design, the sealed tube 302 is a high temperature, high pressure gold tubing.
As shown in fig. 6 to 11, the elastic sealing pressure cell 100 includes 6 indenters 1, and the 6 indenters 1 are respectively located in three axial directions, which herein refer to an X-axis direction, a Y-axis direction, and a Z-axis direction in a three-axis coordinate system. The 6 pressure heads are respectively as follows: two pressure heads 1 symmetrically arranged in the X-axis direction, two pressure heads 1 symmetrically arranged in the Y-axis direction and two pressure heads 1 symmetrically arranged in the Z-axis direction.
In one possible design, the front end face of the pressure head 1 is provided with a miniature high-rigidity sensing device such as an acoustic emission probe, an ultrasonic probe, a heat flow probe, a temperature sensing probe and the like.
It should be noted that, as shown in fig. 12 and 13, the ram 1 includes a ram body 11 and a permeate spacer 12. The front end of the pressing head body 11 is provided with a rectangular convex part 111 protruding forwards, the front end surface of the rectangular convex part 111 is provided with a rectangular caulking groove which is integrally manufactured, and the penetration cushion block 12 is embedded in the rectangular caulking groove through a screw. The infiltration pad 12 is provided with a plurality of infiltration holes 121 which are uniformly distributed, and the dry infiltration holes 121 penetrate through the infiltration pad 12 front and back.
The front end edge of the pressure head body 11 is provided with an annular sealing groove, the rectangular convex part 111 is positioned on the inner periphery of the annular sealing groove, and an annular sealing strip 13 is arranged in the annular sealing groove. A seepage fluid channel 14 and a sealing fluid injection channel 15 are arranged in the pressure head body 11, one end of the seepage fluid channel 14 penetrates through the rectangular caulking groove, and the other end penetrates through the outer surface of the pressure head body 11; one end of the sealing fluid injection channel 15 is communicated with the annular sealing groove, and the other end of the sealing fluid injection channel 15 penetrates through the outer surface of the pressure head body 11.
The three seepage inflow pipes 202 of the seepage system are respectively connected with one of the pressure heads 1 in the X-axis direction, one of the pressure heads 1 in the Y-axis direction and the outer end of the seepage fluid channel 14 of one of the pressure heads 1 in the Z-axis direction; the three seepage pipes 201 are respectively connected with the other pressure head 1 in the X-axis direction, the other pressure head 1 in the Y-axis direction and the seepage fluid channel 14 of the other pressure head 1 in the Z-axis direction. Fluids with different temperatures and pressures can be injected through the seepage fluid channel 14 according to experimental requirements, and the fluids can uniformly flow to the sample through the seepage holes 121.
The 6 sealing pipes 302 of the hydraulic sealing system 300 are respectively connected with the outer ends of the sealing fluid injection channels 15 of the 6 pressure heads 1, and sealing fluid can be injected into the annular sealing groove through the sealing fluid injection channels 15, so that seepage fluid can be prevented from flowing out from the edge of the cube sample 4.
In one possible design, the permeate flow channel 14 is L-shaped, with one end of the permeate flow channel 14 extending vertically through the rectangular channel and the other end extending vertically through the side of the ram 1.
In one possible design, the sealing fluid injection channel 15 is L-shaped, with one end of the sealing fluid injection channel 15 extending vertically through the annular seal groove and the other end extending vertically through the side of the ram 1.
In one possible design, the circumferential sealing strip 13 has an annular groove opening forward. Optionally, the cross section of the circumferential sealing strip 13 is a U-shaped structure with an opening facing outwards.
Alternatively, the circumferential sealing strip 13 is made of high-strength rubber.
To facilitate the docking with external components, the rear end of the ram body 11 is provided with a docking port.
In one possible design, as shown in fig. 6, 6 rams 1 are connected together with at least 8 elastic sheets 2.
It should be noted that the number of the elastic sheets 2 is set reasonably according to the need. In the embodiment, 6 pressure heads 1 are connected together by 12 elastic sheets 2, and the periphery of each pressure head 1 is respectively connected with 4 pressure heads 1 around by one elastic sheet 2. Of course, in another possible design, more elastic sheets 2 may be used to connect the 6 rams 1 together.
Optionally, the outer end of the pressure head 1 is provided with elastic sheet grooves which are matched with the elastic sheets 2, screw holes are arranged in the elastic sheet grooves, and two ends of each elastic sheet 2 are respectively arranged in the elastic sheet grooves and connected with the two pressure heads 1 through screws.
In one possible design, the elastic sealing pressure cell 100 further comprises a sample holder 3 adapted to the 6 indenters 1, as shown in fig. 7-10, the sample holder 3 being used to hold the cubic sample 4 inside thereof, while the openings for the 6 indenters 1 to pass through need to be reserved in 6 directions in order for the indenters 1 to contact the cubic sample 4 inside thereof. In one possible design, as shown in fig. 14 and 15, the sample holder 3 includes a rigid outer cube frame 31 and a flexible inner cube frame 32, the rigid outer cube frame 31 having 12 rigid frame sides, and 6 faces of the rigid outer cube frame 31 each being rectangular.
The flexible inner cube frame 32 can house the cube test sample 4 therein. The flexible inner cube frame 32 has 12 frame edges 321, and 6 faces of the flexible inner cube frame 32 are all rectangular frames and are matched with the rectangular pressure head 1, so that the flexible inner cube frame 32 is integrally manufactured.
In one possible design, as shown in fig. 16 and 17, each face of the flexible inner cube frame 32 has an integrally formed annular flange 322, the annular flange 322 fitting into the annular seal groove of the ram 1 for close fitting into the annular seal groove with the ram 1. As shown in fig. 13, the circumferential sealing strip 13 has an annular groove adapted to the annular flange 322, and the annular flange 322 is operatively fitted in the annular groove of the circumferential sealing strip 13.
The 12 outer corner locations 323 of the flexible inner cube frame 32 are in close proximity to the 12 inner corners of the rigid outer cube frame 31. In one possible design, the 12 inner corner locations of the flexible inner cube frame 32 have right angle edge structures 324 that fit the corners of the cube sample 4.
In one possible design, the ram 1 fits into the rectangular mouth of the rigid outer cube frame 31, which may be held relatively fixed by friction. The rectangular protrusion 111 of the ram 1 fits into the rectangular frame opening of the flexible inner cube frame 32.
In one possible design, the flexible inner cube frame 32 is a wear-resistant, high-pressure-resistant, high-strength rubber frame and the rigid outer cube frame 31 is a metal frame.
In one possible design, a 100 x 100mm cube specimen 4 may be loaded into the flexible inner cube frame 32.
The cube sample 4 is arranged in the flexible inner cube frame 32 of the sample clamp 3, 12 edges and corners of the cube sample 4 are attached to the 12 inner edges and corners of the flexible inner cube frame 32, and the front ends of the 6 pressure heads 1 extend into contact with the surface of the cube sample 4 from the frame openings in 6 directions of the sample clamp 3 respectively; the annular flanges 322 of the flexible inner cube frame 32 in 6 directions are correspondingly inserted into the annular grooves of the annular sealing strips 13 of the 6 pressure heads 1.
In the experimental process, a preset three-way stress is applied to the cube sample 4 through the 6 pressure heads 1, and sealing fluid is simultaneously injected into the sealing fluid injection channels 15 of the 6 pressure heads 1 through the high-pressure plunger pump, so that 12 edges of the cube sample 4 are tightly attached to the flexible inner cube frame 32, a three-way sealing effect is achieved, and seepage fluid can be prevented from flowing out from the edges of the cube sample 4;
subsequently, a three-way permeability test was performed.
The application can also be used for seepage experiments in any inlet and outlet directions, such as X-Y direction, X-Z direction, Y-Z direction, X-YZ direction and the like.
The foregoing detailed description has set forth the objectives, technical solutions and advantages of the present application in further detail, but it should be understood that the foregoing is only illustrative of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. Deep rock three-way seepage flow test structure, its characterized in that: comprising the following steps:
the 6 pressure heads (1) are located in the X-axis direction, the Y-axis direction and the Z-axis direction in pairs; the 6 pressure heads (100) are respectively used for contacting with the sample from six directions, a plurality of penetration holes (121) are arranged at one end of each pressure head (1) facing the sample, a seepage fluid channel (14) is arranged in each pressure head (1), and the seepage fluid channel (14) is communicated with the plurality of penetration holes (121);
a seepage system comprising three seepage inlet pipes (202) and three seepage outlet pipes (201); the three seepage inflow pipes (202) are respectively connected with one pressure head (1) in the X-axis direction, one pressure head (1) in the Y-axis direction and a seepage fluid channel (14) of one pressure head (1) in the Z-axis direction; the three seepage pipes (201) are respectively connected with the other pressure head (1) in the X-axis direction, the other pressure head (1) in the Y-axis direction and the seepage fluid channel (14) of the other pressure head (1) in the Z-axis direction.
2. The deep rock three-way seepage test structure according to claim 1, wherein: the three seepage inflow pipes (202) are connected with the plunger pump through 4-way valves.
3. The deep rock three-way seepage test structure according to claim 1, wherein: valves (203) are respectively arranged on the three seepage inflow pipes (202) and the three seepage outflow pipes (201).
4. The deep rock three-way seepage test structure according to claim 1, wherein: the pressure head (1) comprises a pressure head body (11) and a permeation cushion block (12), wherein a rectangular convex part (111) protruding forwards is arranged at the front end of the pressure head body (11), a rectangular caulking groove which is integrally manufactured is arranged on the front end face of the rectangular convex part (111), and the permeation cushion block (12) is embedded in the rectangular caulking groove; a plurality of penetration holes (121) are uniformly arranged on the penetration cushion block (12), and the dry penetration holes (121) penetrate through the penetration cushion block (12) front and back;
the seepage flow channel (14) is arranged in the pressure head body (11), one end of the seepage flow channel (14) is communicated with the rectangular caulking groove, and the other end of the seepage flow channel (14) is communicated with the side face of the pressure head body (11).
5. Real-time test system of deep rock three-dimensional permeability, its characterized in that: a deep rock three-way seepage test structure as claimed in any one of claims 1-4 is adopted, an annular sealing groove is formed in the edge of one end, facing the sample, of the pressure head (1), and a plurality of seepage holes (121) are formed in the inner periphery of the annular sealing groove; a sealing fluid injection channel (15) is arranged in the pressure head (1), one end of the sealing fluid injection channel (15) is communicated with the annular sealing groove, and the other end of the sealing fluid injection channel (15) is communicated with the outer surface of the pressure head body (11).
6. The real-time deep rock three-dimensional permeability test system according to claim 5, wherein: the hydraulic sealing system (300) comprises a sealing inlet pipe (301), 6 sealing outlet pipes (302) and a flow dividing assembly (303), wherein the flow dividing assembly (303) comprises 1 inlet path and 6 outlet paths, the 6 outlet paths are respectively connected with one of the sealing outlet pipes (302), and the 1 inlet path is connected with a high-pressure plunger pump through the sealing inlet pipe (301); the 6 sealing outlet pipes (302) are respectively connected with the outer end of the sealing fluid injection channel (15) of one pressure head (1).
7. The deep rock three-dimensional permeability real-time testing system according to claim 5 or 6, wherein: the device comprises a sample fixture (3), wherein the sample fixture (3) comprises a rigid outer cube frame (31) and a flexible inner cube frame (32), the rigid outer cube frame (31) and the flexible inner cube frame (32) are respectively provided with 12 frame edges, 6 faces of the rigid outer cube frame (31) and the flexible inner cube frame (32) are respectively rectangular frames, and 12 outer corner angle positions (323) of the flexible inner cube frame (32) are attached to 12 inner corner angles of the rigid outer cube frame (31);
the flexible inner cube frame (32) can be internally provided with cube samples (4), and one ends of the 6 pressure heads (1) which are used for being contacted with the samples can respectively extend into the sample clamp (3) from frame openings in 6 directions of the sample clamp (3);
each face of the flexible inner cube frame (32) is provided with an integrally manufactured annular flange (322), and the annular flange (322) is matched with the annular sealing groove of the pressure head (1); the annular sealing groove of the pressure head (1) is internally provided with an annular sealing strip (13), and the annular sealing strip (13) is provided with an annular groove matched with the annular flange (322).
8. The real-time deep rock three-dimensional permeability test system according to claim 7, wherein: the four sides of each pressure head (1) are respectively connected with the four sides of the 4 pressure heads (1) through one elastic sheet (2), and the 12 elastic sheets (12) are positioned at the outer side of the sample clamp (3).
9. The deep rock three-dimensional permeability real-time testing system according to claim 7, wherein: the cube sample (4) is arranged in the flexible inner cube frame (32), and one ends of the 6 pressure heads (1) which are used for being contacted with the sample extend into the sample clamp (3) to be respectively contacted with 6 surfaces of the cube sample (4);
the annular flanges (322) in 6 directions of the flexible inner cube frame (32) are correspondingly inserted into annular grooves of the annular sealing strips (13) of the 6 pressure heads (1);
the front end face of the pressure head (1) is provided with an acoustic emission probe, an ultrasonic probe, a heat flow probe and a temperature sensing probe.
10. The deep rock three-dimensional permeability real-time testing system according to claim 7, wherein: the 12 inner corner locations of the flexible inner cube frame (32) have right angle edge structures (324) that fit the corners of the cube sample (4).
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