CN110130872A - Artificial fracture network seepage rule simulation experiment device - Google Patents

Abstract

This application provides a kind of man-made fracture network seepage rule imitative experimental appliances, comprising: core holding unit, artificial core, artificial core are set in core holding unit；Artificial core includes the rock core unit of multiple phase splicings, and forms man-made fracture between multiple rock core units；Confining pressure system, confining pressure system are connected with core holding unit, and confining pressure system is used to apply confining pressure to artificial core；Injected system, injected system are connected with core holding unit, and injected system is used to apply first pressure to fluid, enable fluid to pass through from man-made fracture at the first pressure；Artificial core includes the first core column and the second core column mutually spliced, and each first core column is mutually spliced to form with each second core column by multiple rock core units along the longitudinal direction.The application embodiment provides a kind of man-made fracture network seepage rule imitative experimental appliance of percolation law in complicated man-made fracture that can disclose reservoir fluid.

Description

Artificial fracture network seepage rule simulation experiment device

technical field

The present application relates to the technical field of petroleum drilling, in particular to an artificial fracture network seepage rule simulation experiment device.

Background technique

The artificial fracture network seepage rule simulation experiment device can be used to simulate the seepage of reservoir fluid in complex artificial fractures.

In tight oil reservoirs, complex artificial fractures are formed near the wellbore after large-scale fracturing. Tight oil reservoirs have complex physical properties of low porosity and low permeability, and it is difficult to obtain economic production under natural conditions. But when complex artificial fractures are formed in tight reservoirs, the efficient and economical development of tight reservoirs becomes a reality.

However, in terms of seepage mechanism, there are few studies on the experimental simulation of complex artificial fractures. Therefore, the seepage law of reservoir fluid under complex artificial fracture network conditions has not been fully understood in the prior art.

Therefore, it is necessary to propose an experimental device for simulating seepage law of artificial fracture network to solve the above problems.

Contents of the invention

In view of this, the embodiments of the present application provide an artificial fracture network seepage law simulation experiment device capable of revealing the seepage law of reservoir fluid in complex artificial fractures.

In order to achieve the above object, the present application provides the following technical proposal: an artificial fracture network seepage rule simulation experiment device, comprising: a core holder, an artificial core, the artificial core is arranged in the core holder; The artificial rock core includes a plurality of spliced core units, and artificial cracks are formed between the plurality of core units; a confining pressure system, the confining pressure system is connected with the core holder, and the confining pressure system is used for For applying confining pressure to the artificial core; an injection system, the injection system communicated with the core holder, the injection system is used to apply a first pressure to the fluid, so that the fluid can be in the second Pass through the artificial fracture under a pressure.

As a preferred embodiment, each of the core units is in the shape of an equilateral right-angled triangular prism.

As a preferred embodiment, the artificial core comprises a spliced first core column and a second core column, each of the first core column and each of the second core columns consists of a plurality of the core The units are spliced together along the front and rear directions.

As a preferred embodiment, the first core column and the second core column are multiple, and the multiple first core columns and the multiple second core columns are spliced along the left and right directions A plurality of the second core columns correspond to a plurality of the first core columns, and each of the second core columns is located on one side of the corresponding first core column in the vertical direction.

As a preferred implementation manner, the artificial fracture includes a first gap disposed between adjacent first core pillars, and a gap between each second core pillar and the corresponding first core pillar. The second gap between them and the third gap arranged between the adjacent second core columns.

As a preferred embodiment, the artificial core includes spliced first core blocks, second core blocks and third core blocks, each of the third core blocks, each of the first core blocks and each of the Each of the second core blocks is a cube formed by splicing two core units.

As a preferred embodiment, the first core block, the second core block and the third core block are multiple, and the multiple first core blocks and the multiple second core blocks Corresponding to a plurality of third core blocks, a plurality of first core blocks, a plurality of second core blocks and a plurality of third core blocks are spliced along the left and right direction; each of the The second core block is located on one side of the corresponding first core block in the vertical direction; each of the third core blocks is located on one side of the corresponding first core block in the front-rear direction.

As a preferred embodiment, the artificial fractures include a fourth gap set between adjacent first core blocks, a fifth gap set between adjacent second core blocks, and a fifth gap set between adjacent second core blocks. The sixth gap adjacent to the third core block, the seventh gap disposed between the second core block and the corresponding first core block, and the seventh gap disposed between the third core block and the corresponding first core block An eighth gap between the first core blocks is described.

As a preferred embodiment, the artificial fractures further include a first inclined fracture formed between the two core units constituting the first core block, and two of the core units constituting the second core block. A second inclined fracture formed between core units and a third inclined fracture formed between two of said core units constituting said third core block.

As a preferred embodiment, it includes: a back pressure system, the back pressure system communicates with the side of the core holder facing away from the injection system, and the back pressure system is used to inject A second pressure is applied in the holder, so that the fluid can pass through the artificial fracture under the action of the difference between the first pressure and the second pressure.

By virtue of the above technical solutions, the artificial fracture network seepage rule simulation experimental device described in the embodiment of the present application is provided with an artificial core, the artificial core includes a plurality of spliced core units, and artificial fractures are formed between the plurality of core units. Therefore, complex artificial fractures can be formed by splicing multiple core units to simulate the complex artificial fractures formed in tight oil reservoirs near the wellbore after large-scale fracturing, and then the fluid can seep in the artificial core, revealing Seepage law of reservoir fluid in complex artificial fractures. Therefore, the embodiments of the present application provide an artificial fracture network seepage law simulation experiment device capable of revealing the seepage law of reservoir fluid in complex artificial fractures.

Description of drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only schematic and are used to help the understanding of the present application, and do not specifically limit the shapes and proportional dimensions of the various components of the present application. Under the teaching of this application, those skilled in the art can select various possible shapes and proportional dimensions according to specific situations to implement this application. In the attached picture:

Fig. 1 is the schematic diagram of the structure of the artificial fracture network seepage rule simulation experiment device according to the embodiment of the present application;

Fig. 2 is the structural representation of the core holder in the embodiment of the present application;

Fig. 3 is the schematic diagram of splicing of a plurality of rock core units in the embodiment of the present application;

Fig. 4 is the structural representation of a kind of artificial rock core in the embodiment of the present application;

FIG. 5 is a schematic structural view of another artificial core in the embodiment of the present application;

Fig. 6 is a schematic structural view of another artificial core in the embodiment of the present application.

Explanation of reference signs:

11. Core holder; 13. Artificial core; 15. Artificial crack; 17. Core unit; 23. The first core column; 25. The second core column; 27. Annular space; 29. The first gap; 31. The first The second gap; 33, the third gap; 35, the fourth gap; 37, the fifth gap; 39, the sixth gap; 41, the seventh gap; 43, the eighth gap; 45, the first core block; 47, the second gap Core block; 49, third core block; 51, first inclined fracture; 53, second inclined fracture; 57, proppant; 59, inner cylinder; 61, outer cylinder; 63, core plug; 65, opening; 67 , input end; 69, output end; 71, first valve; 73, second valve; 75, first power pump; 77, second power pump; 79, first pipeline; 81, intermediate container; 83, third Valve; 85, fourth valve; 87, second pipeline; 89, third pipeline; 91, regulating cylinder; 93, back pressure valve; 95, recovery container; 97, fourth pipeline; 99, fifth pipeline.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the accompanying drawings in the embodiments of the application. Apparently, the described embodiments are only part of the embodiments of the application, not all of them. Based on the implementation manners in this application, all other implementation manners obtained by persons of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terminology used herein in the description of the application is only for the purpose of describing specific embodiments, and is not intended to limit the application.

Please refer to Fig. 1 to Fig. 6, a kind of artificial fracture 15 simulation experiment device provided in this embodiment includes: core holder 11, artificial core 13, and described artificial core 13 is arranged in described core holder 11 ; The artificial rock core 13 includes a plurality of spliced core units 17, and artificial fractures 15 are formed between a plurality of the core units 17; the confining pressure system, the confining pressure system communicates with the core holder 11 , the confining pressure system is used to apply a confining pressure to the artificial core 13; an injection system, the injection system is communicated with the core holder 11, and the injection system is used to apply a first pressure to the fluid to The fluid can pass through the artificial fracture 15 under the first pressure.

When in use, the confining pressure is first applied to the artificial core 13 through the confining pressure system. Then, the injection system applies a first pressure to the fluid, so that the fluid passes through the artificial fracture 15 in the artificial core 13 under the first pressure, so as to simulate the seepage of reservoir fluid in the complex artificial fracture 15 .

It can be seen from the above scheme that the artificial fracture 15 simulation experiment device described in the embodiment of the present application is provided with an artificial rock core 13, which includes a plurality of spliced core units 17, and artificial fractures are formed between the plurality of core units 17. 15. Therefore, complex artificial fractures 15 can be formed through the splicing of multiple core units 17, so as to simulate the complex artificial fractures 15 formed by tight oil reservoirs in the formation near the wellbore after large-scale fracturing, and then fluid can flow through the artificial core 13. Internal seepage, revealing the seepage law of reservoir fluid in complex artificial fractures 15.

As shown in FIG. 1 and FIG. 2 , in this embodiment, the core holder 11 is used to clamp the core. Specifically, the core holder 11 includes an outer cylinder 61 , an inner cylinder 59 passing through the outer cylinder 61 , and core plugs 63 disposed at both ends of the inner cylinder 59 . The outer cylinder 61 has a square cross section. Certainly, the cross-section of the outer cylinder 61 is not limited to being square, and may also be in other shapes, which is not fixed in this application. The inner cylinder 59 is used to place the artificial core 13 . The core plug 63 is used to limit the core. An annular space 27 is formed between the inner cylinder 59 and the outer cylinder 61 . The annular space 27 is used for injecting ring pressure fluid. Further, the material of the inner cylinder 59 is rubber. Therefore, when the ring pressure fluid is injected into the annular space 27 , the ring pressure fluid can exert ring pressure on the artificial core 13 in the inner cylinder 59 . Of course, the material of the inner cylinder 59 is not limited thereto, and can also be other materials, such as resin, which is not specified in this application. Further, the outer cylinder 61 is provided with an opening 65 communicating with the annular space 27 . For example, as shown in FIG. 2 , the opening 65 is provided on the lower side of the outer cylinder 61 . Thus, ring pressure fluid can be injected into the annular space 27 through the opening 65 . The outer cylinder 61 is also provided with a first valve 71 . The first valve 71 is located on the opposite side of the opening 65 . The first valve 71 is used to connect the annular space 27 with the outside world, so that the air pressure in the annular space 27 is equal to the atmospheric pressure, so as to ensure that the annular pressure fluid can be injected into the annular space 27 . Further, the outer cylinder 61 is also provided with an input end 67 and an output end 69 communicating with the inner cylinder 59 . Therefore, fluid can be input into the inner cylinder 59 through the input port 67 . And the fluid in the inner cylinder 59 flows out through the output port 69 . For example, as shown in FIG. 2 , the input end 67 is disposed on the left side of the outer cylinder 61 . The output end 69 is disposed on the right side of the outer cylinder 61 . Therefore, the fluid can seep from left to right toward the inside of the artificial core 13 , thereby revealing the law of seepage of the fluid in the artificial fracture 15 of the artificial core 13 . The core holder 11 can also adopt an existing structure, which is not specified in this application.

In this embodiment, the artificial core 13 is set in the core holder 11 . Specifically, as shown in FIG. 2 , the artificial core 13 is located in the inner cylinder 59 , and the artificial core 13 is located between the core plugs 63 at both ends of the inner cylinder 59 . The artificial core 13 includes a plurality of coherent core units 17 . Artificial fractures 15 are formed between a plurality of core units 17 . That is to say, the core unit 17 is the basic unit for making the artificial core 13 . The artificial core 13 can be formed by splicing a plurality of core units 17 . And when a plurality of core units 17 are spliced together, artificial fractures 15 can be formed in the formed artificial core 13 . Therefore, firstly, complex artificial fractures 15 are formed by splicing multiple core units 17, so as to be able to simulate the complex artificial fractures 15 formed in formations near the wellbore after large-scale fracturing in tight oil reservoirs. Second, various artificial fractures 15 can be formed by changing the splicing manner of multiple core units 17 . Further, each core unit 17 is in the shape of an equilateral right-angled triangular prism. Therefore, various artificial fractures 15 of different shapes can be spliced through the equilateral right-angled triangular prism core unit 17 to simulate the complex artificial fractures 15 formed in formations near the wellbore after large-scale fracturing in tight oil reservoirs. For example, as shown in FIG. 3 , when the surfaces of two core units 17 on opposite sides at right angles are spliced together, an artificial fracture 15 extending obliquely can be formed between the two core units 17 . And the two core units 17 can form a cube. When the plurality of cubes are spliced together, artificial cracks 15 extending vertically or artificial cracks 15 extending left and right can be formed.

In one embodiment, as shown in FIG. 4 , the artificial core 13 includes a first core column 23 and a second core column 25 that are spliced together. Specifically, the first core column 23 is a cuboid. The second core column 25 is a cuboid. And the length of the second core column 25 is equal to the length of the first core column 23 . Each first core column 23 and each second core column 25 are formed by splicing a plurality of core units 17 along the front-rear direction. For example, as shown in FIG. 4 , first, the surfaces of two core units 17 on opposite sides at right angles are spliced together to form a cube. Then a plurality of the cube phases are spliced in the front-back direction to obtain a first core column 23 extending in the front-back direction. In the same way, first, the surfaces of the two core units 17 on opposite sides at right angles are spliced together to form a cube. Then a plurality of the cube facies are spliced in the front-back direction to obtain a second core column 25 extending in the front-back direction.

Further, adjacent core units 17 in each first core column 23 may be in contact, that is, there may be no gap between adjacent core units 17 in each first core column 23 . Therefore, there may be no artificial fractures 15 in each first core column 23 . Adjacent core units 17 in each second core column 25 may be in contact, that is, there may be no gap between adjacent core units 17 in each second core column 25 . Therefore, there may be no artificial fracture 15 in each second core column 25 .

Further, both the first core column 23 and the second core column 25 are plural. That is, there are multiple first core columns 23 . There are multiple second core columns 25 . The plurality of first core columns 23 and the plurality of second core columns 25 are joined together along the left-right direction. That is, a plurality of first core pillars 23 are spliced along the left and right directions. And a plurality of second core columns 25 are spliced along the left and right directions. Further, the multiple second core strings 25 correspond to the multiple first core strings 23 . The correspondence may be that the number of first core strings 23 is equal to the number of second core strings 25 . Each second core column 25 is located on one side of the corresponding first core column 23 in the vertical direction. Specifically, for example, as shown in FIG. 4 , the first core pillars 23 are arranged at the uppermost part of the artificial core 13 along the left-right direction. And there are seven first core columns 23 . The second core column 25 is located below the first core column 23 . And there are seven second core pillars 25 .

Further, the artificial fracture 15 includes a first gap 29 disposed between adjacent first core pillars 23, a second gap 31 disposed between each second core pillar 25 and the corresponding first core pillar 23, and a set of The third gap 33 between adjacent second core columns 25 . That is to say, the adjacent first core columns 23 are spaced apart, thereby forming the first gap 29 . Adjacent second core columns 25 are spaced apart to form a third gap 33 . Each second core column 25 is spaced apart from the corresponding first core column 23 to form a second gap 31 . For example, as shown in FIG. 4 , the first gap 29 extends in the vertical direction. The third gap 33 extends in the vertical direction. The second gap 31 extends in the left-right direction. Therefore, when the fluid is displaced along the left-right direction, that is, when the fluid flows through the artificial core 13 along the left-right direction, the extension direction of the first gap 29 is perpendicular to the direction of fluid displacement. The extension direction of the third gap 33 is perpendicular to the displacement direction of the fluid. The extending direction of the second gap 31 is parallel to the displacement direction of the fluid. Therefore, through the first gap 29 , the second gap 31 and the third gap 33 , the artificial fracture 15 can not only have a fracture shape parallel to the displacement direction, but also have a fracture shape perpendicular to the displacement direction. In this way, the complexity of the artificial fracture 15 is increased to obtain the influence of different fracture shapes on the seepage law.

Further, a proppant 57 for adjusting the width of the artificial fracture 15 is arranged in the artificial fracture 15 . As shown in FIG. 4 , the proppant 57 is disposed in the first gap 29 , the second gap 31 and the third gap 33 . Therefore, the width of the first gap 29 can be adjusted by adjusting the amount of proppant 57 in the first gap 29 . In order to obtain the first gap 29 with different slit widths. And the width of the second gap 31 can be adjusted by adjusting the amount of the proppant 57 in the second gap 31 . In order to obtain the second gap 31 with different slit widths. And the width of the third gap 33 can be adjusted by adjusting the amount of the proppant 57 in the third gap 33 . In order to obtain the third gap 33 with different slit widths. In this way, artificial rock cores 13 with artificial fractures 15 of different widths can be placed in the core holder 11 to conduct seepage experiments, so as to obtain the influence of seepage width on seepage law.

In one embodiment, as shown in FIG. 5 , the artificial core 13 includes a first core block 45 , a second core block 47 and a third core block 49 that are spliced together. Each third core block 49 , each first core block 45 and each second core block 47 are cubes formed by splicing two core units 17 . Specifically, the surfaces of the two core units 17 on opposite sides at right angles are in contact to form the first core block 45 , or the second core block 47 , or the third core block 49 .

Further, there may be no gap between the two core units 17 forming each first core block 45 , so that each first core block 45 does not have artificial fractures 15 . There may be no gap between the two core units 17 forming each second core block 47 , so that there is no artificial fracture 15 in each second core block 47 . There may be no gap between the two core units 17 forming each third core block 49 , so that there is no artificial fracture 15 in each third core block 49 . Of course, there may also be a gap between the two core units 17 forming each first core block 45 , so that each first core block 45 has an artificial fracture 15 inside. There may also be a gap between the two core units 17 forming each second core block 47 , so that each second core block 47 has an artificial fracture 15 inside. There may also be a gap between the two core units 17 forming each third core block 49 , so that each third core block 49 has an artificial fracture 15 therein.

Further, there are multiple first core blocks 45 , second core blocks 47 and third core blocks 49 . That is, there are multiple first core blocks 45 . There are multiple second core blocks 47 . There are multiple third core blocks 49 . The plurality of first core blocks 45 and the plurality of second core blocks 47 correspond to the plurality of third core blocks 49 . The correspondence may be that the number of the first core blocks 45 , the number of the second core blocks 47 and the number of the third core blocks 49 are all equal. Each second core block 47 is located on one side of the corresponding first core block 45 in the up-down direction. Each third core block 49 is located on one side of the corresponding first core block 45 in the front-rear direction. For example, as shown in FIG. 5 , the first core blocks 45 are arranged at the uppermost part of the artificial core 13 in the vertical direction. And there are seven first core blocks 45 . The second core block 47 is located on the underside of the first core block 45 . And there are seven second core blocks 47 . The third core block 49 is located on the rear side of the first core block 45 . And there are seven third core blocks 49 . A plurality of first core blocks 45 , a plurality of second core blocks 47 and a plurality of third core blocks 49 are all spliced along the left-right direction. That is, a plurality of first core blocks 45 are spliced along the left and right directions. A plurality of second core blocks 47 are spliced along the left and right directions. A plurality of third core blocks 49 are spliced along the left and right directions. Specifically, for example, as shown in FIG. 5 , seven first core blocks 45 are spliced along the left and right directions. The seven second core blocks 47 are spliced along the left and right directions. The seven third core blocks 49 are spliced along the left and right directions.

Further, the artificial fracture 15 includes a fourth gap 35 disposed between adjacent first core blocks 45, a fifth gap 37 disposed between adjacent second core blocks 47, and a fifth gap 37 disposed between adjacent third core blocks 49. The sixth gap 39 between them, the seventh gap 41 disposed between the second core block 47 and the corresponding first core block 45, and the seventh gap 41 disposed between the third core block 49 and the corresponding first core block 45 Eight gaps43. That is, the adjacent first core blocks 45 are spaced apart, thereby forming the fourth gap 35 . Adjacent second core blocks 47 are spaced apart to form fifth gaps 37 . Adjacent third core blocks 49 are spaced apart to form a sixth gap 39 . Each second core block 47 is spaced from the corresponding first core block 45 to form a seventh gap 41 . For example, as shown in FIG. 5 , the fourth gap 35 extends in the vertical direction. The fifth gap 37 extends in the vertical direction. The sixth gap 39 extends in the vertical direction. The seventh gap 41 extends in the left-right direction. The eighth gap 43 extends in the left-right direction. Therefore, when the fluid is displaced in the left-right direction, that is, when the fluid flows through the artificial core 13 in the left-right direction, the extension direction of the seventh gap 41 is consistent with the fluid displacement direction. The extending direction of the fourth gap 35 , the extending direction of the fifth gap 37 , and the extending direction of the sixth gap 39 are all perpendicular to the displacement direction of the fluid. Therefore, through the fourth gap 35, the fifth gap 37, the sixth gap 39, the seventh gap 41, and the eighth gap 43, the artificial fracture 15 can not only have a fracture shape parallel to the displacement direction, but also have a fracture shape parallel to the displacement direction. Vertical crack pattern. In this way, the complexity of the artificial fracture 15 is increased to obtain the influence of different fracture shapes on the seepage law.

Further, a proppant 57 for adjusting the width of the artificial fracture 15 is arranged in the artificial fracture 15 . As shown in FIG. 5 , the proppant 57 is arranged in the fourth gap 35 , the fifth gap 37 , the sixth gap 39 , the seventh gap 41 and the eighth gap 43 . Thus, the fourth gap 35, the fifth gap 37, and the sixth gap can be adjusted respectively by adjusting the amount of proppant 57 in the fourth gap 35, the fifth gap 37, the sixth gap 39, the seventh gap 41, and the eighth gap 43. 39. The width of the seventh gap 41 and the eighth gap 43 . In order to obtain the fourth gap 35 , the fifth gap 37 , the sixth gap 39 , the seventh gap 41 and the eighth gap 43 with different crack widths. In this way, the artificial rock cores 13 with artificial fractures 15 of different widths can be placed in the core holder 11 to conduct seepage experiments, so as to obtain the influence of the fracture width on the seepage law.

Further, since the volumes of the first rock core block 45, the second rock core block 47 and the third rock core block 49 are smaller than the volume of the first rock core block 23, the first rock core block 45, the second rock core block 47 and the third rock core block The fracture density of the artificial core 13 formed by splicing the core blocks 49 is greater than that of the artificial core 13 formed by splicing the first core column 23 and the second core column 25 . In this way, artificial rock cores 13 with artificial fractures 15 with different fracture densities can be placed in the core holder 11 to conduct seepage experiments, so as to obtain the influence of fracture density on seepage law.

In one embodiment, as shown in FIG. 6 , the artificial fracture 15 also includes a first inclined fracture 51 formed between the two core units 17 constituting the first core block 45 , and two cores constituting the second core block 47 . The second inclined fracture 53 formed between the cells 17 and the third inclined fracture formed between the two core cells 17 constituting the third core block 49 . That is, the surfaces of the two core units 17 constituting the first core block 45 on opposite sides at right angles are not in contact, so that the first inclined fracture 51 is formed. The surfaces of the two core units 17 constituting the second core block 47 on opposite sides at right angles are not in contact, so that the second inclined fracture 53 is formed. The surfaces of the two core units 17 constituting the third core block 49 on opposite sides at right angles are not in contact, thereby forming a third inclined fracture. Therefore, through the first inclined fracture 51 , the second inclined fracture 53 and the third inclined fracture, the artificial fracture 15 has a fracture shape with an included angle of 45° to the displacement direction. In this way, the complexity of the artificial fracture 15 is increased to obtain the influence of different fracture shapes on the seepage law.

In this embodiment, the confining pressure system is used to apply confining pressure to the artificial core 13 . The confining pressure system communicates with the core holder 11 . Specifically, the confining pressure system communicates with the opening 65 on the outer cylinder 61 . Therefore, ring pressure fluid can be applied to the annular space 27 between the outer cylinder 61 and the inner cylinder 59 through the opening 65 . Specifically, the confining pressure system includes a first power pump 75 and a second valve 73 . The first power pump 75 communicates with the opening 65 through a first pipeline 79 . The second valve 73 is disposed on the first pipeline 79 . When applying confining pressure, the first valve 71 needs to be opened first, so that the air pressure in the annular space 27 is equal to the atmospheric pressure. Then the second valve 73 is opened, so that the annular pressure fluid can be injected into the annular space 27 through the first pipeline 79 .

In this embodiment, the injection system is used to apply a first pressure to the fluid, so that the fluid can pass through the artificial fracture 15 under the first pressure. The injection system communicates with the core holder 11 . Specifically, the injection system communicates with the input end 67 of the outer cylinder 61 . Therefore, fluid can be injected into the inner barrel 59 through the input end 67 , so that the fluid can seep in the artificial fracture 15 of the artificial core 13 and finally flow out from the output end 69 . Specifically, the injection system includes a second power pump 77 , an intermediate container 81 , a third valve 83 and a fourth valve 85 . The upper portion of the intermediate container 81 is filled with fluid. This fluid is used to seep in the artificial fracture 15 of the artificial core 13 . The lower portion of the intermediate container 81 is water. The upper part of the intermediate container 81 communicates with the input port 67 through a second pipeline 87 . The third valve 83 is disposed on the second pipeline 87 . The lower part of the intermediate container 81 communicates with the second power pump 77 through a third pipeline 89 . The fourth valve 85 is disposed on the third pipeline 89 . The second power pump 77 is used to apply a first pressure to the water in the lower part of the intermediate container 81 , so that the fluid in the upper part of the intermediate container 81 can flow into the input port 67 under the first pressure. During the experiment, after the annular space 27 is filled with ring pressure fluid, the third valve 83 and the fourth valve 85 are opened, so that the fluid in the upper part of the intermediate container 81 can be injected into the input port 67 under the pressure of the water in the lower part.

In one embodiment, the artificial fracture 15 simulation experiment device of this embodiment further includes: a back pressure system. The back pressure system is used to apply a second pressure to the core holder 11 so that the fluid can pass through the artificial fracture 15 under the action of the difference between the first pressure and the second pressure. The back pressure system communicates with the side of the core holder 11 facing away from the injection system. Specifically, the back pressure system communicates with the output 69 . Therefore, the back pressure system can apply a second pressure to the output end 69, so that the fluid in the upper part of the intermediate container 81 can pass through the artificial fracture 15 of the artificial core 13 under the effect of the difference between the first pressure and the second pressure. . Specifically, the back pressure system includes a regulating gas cylinder 91 , a back pressure valve 93 , and a recovery container 95 . The regulating gas cylinder 91 communicates with the output port 69 through a fourth pipeline 97 . The back pressure valve 93 is disposed on the fourth pipeline 97 . The recovery container 95 communicates with the fourth line 97 through the fifth line 99 . During the experiment, after the ring pressure liquid is filled in the annular space 27, the back pressure valve 93 is first opened, and then the third valve 83 and the fourth valve 85 are opened, so that the fluid in the upper part of the intermediate container 81 can be at the first pressure and the second pressure. Seepage in the artificial fracture 15 of the artificial core 13 under the effect of the pressure difference between the two pressures. And the fluid flowing out from the output port 69 can flow into the recovery container 95 .

It should be noted that in the description of this application, terms such as "first" and "second" are only used for describing purposes and distinguishing similar objects, and there is no sequence between the two, nor can they be interpreted as indicating or imply relative importance. In addition, in the description of the present application, unless otherwise specified, "plurality" means two or more.

It should be understood that the foregoing description is for purposes of illustration and not limitation. Many implementations and many applications other than the examples provided will be apparent to those of skill in the art from reading the above description. The scope of the present teachings, therefore, should be determined not with reference to the above description, but should be determined with reference to the preceding claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for completeness. The omission from the preceding claims of any aspect of the subject matter disclosed herein is not intended to be a disclaimer of such subject matter, nor should it be considered that the applicant did not consider the subject matter to be part of the disclosed subject matter of the application.

Claims (10)

1. a kind of man-made fracture network seepage rule imitative experimental appliance characterized by comprising

Core holding unit,

Artificial core, the artificial core are set in the core holding unit；The artificial core includes what multiple phases were spliced Rock core unit, and man-made fracture is formed between multiple rock core units；

Confining pressure system, the confining pressure system are connected with the core holding unit, and the confining pressure system is used for the artificial rock The heart applies confining pressure；

Injected system, the injected system are connected with the core holding unit, and the injected system is used to apply the to fluid One pressure, so that the fluid can pass through from the man-made fracture under the first pressure.

2. man-made fracture network seepage rule imitative experimental appliance according to claim 1, it is characterised in that: each described Rock core unit is equilateral right-angle prismatic cylindricality.

3. man-made fracture network seepage rule imitative experimental appliance according to claim 1, it is characterised in that: described artificial Rock core includes the first core column and the second core column mutually spliced, each first core column and each second core column It is mutually spliced to form along the longitudinal direction by multiple rock core units.

4. man-made fracture network seepage rule imitative experimental appliance according to claim 3, it is characterised in that: described first Core column and second core column are multiple, and multiple first core columns and multiple second core columns are along a left side Right direction is mutually spliced；Multiple second core columns are corresponding with multiple first core columns, each second core column It is located at the side of corresponding first core column in the up-down direction.

5. man-made fracture network seepage rule imitative experimental appliance according to claim 4, it is characterised in that: described artificial Crack include the first gap being set between adjacent first core column, be set to each second core column with it is corresponding First core column between the second gap and the third space that is set between adjacent second core column.

6. man-made fracture network seepage rule imitative experimental appliance according to claim 1, it is characterised in that: described artificial Rock core includes the first core block, the second core block and third core block mutually spliced, each third core block, each described First core block and each second core block are mutually to be spliced to be formed by square by two rock core units.

7. man-made fracture network seepage rule imitative experimental appliance according to claim 6, it is characterised in that: described first Core block, second core block and the third core block are multiple, multiple first core blocks, multiple described Two core blocks are corresponding with multiple third core blocks, multiple first core blocks, multiple second core blocks with And multiple third core blocks mutually splice in left-right direction；Each second core block is located at correspondence in the up-down direction First core block side；Each third core block is located at corresponding first core block in the longitudinal direction Side.

8. man-made fracture network seepage rule imitative experimental appliance according to claim 7, it is characterised in that: described artificial Crack includes the 4th gap being set between adjacent first core block, is set between adjacent second core block 5th gap, the 6th gap being set between the adjacent third core block, be set to second core block with it is corresponding The 7th gap between first core block and be set to the third core block and corresponding first core block it Between the 8th gap.

9. man-made fracture network seepage rule imitative experimental appliance according to claim 8, it is characterised in that: described artificial Crack further includes being formed by the first dipping fracture between two rock core units for constituting first core block, constituting institute It states and is formed by the second dipping fracture and the composition third core block between two rock core units of the second core block Two rock core units between be formed by third dipping fracture.

10. man-made fracture network seepage rule imitative experimental appliance according to claim 1, characterized in that it comprises: Back pressure system, the back pressure system are connected with the side of the core holding unit back to the injected system, the back pressure system System is for applying second pressure into the core holding unit, so that the fluid can be in the first pressure and second pressure Pass through from the man-made fracture under the action of the difference of power.