A long fracture multi-angle fracture simulation device and system

Abstract

The application provides a long crack multi-angle crack simulation device and system, the crack simulation device comprises a base, a bottom plate, an extension rod and a crack model body, wherein the base is fixedly arranged on the ground, the bottom plate is horizontally arranged on the base and the bottom plate is hinged with the base; the crack model body is fixedly arranged on the bottom plate along the length direction of the bottom plate and is perpendicular to the bottom plate, the crack model body comprises two or more crack models and universal expansion joints connecting adjacent two crack models, the crack model body is in a curved or linear form with a certain length; one end of the extension rod is connected with the base, the other end is connected with the bottom plate to push the bottom plate to rotate relative to the base, so that the simulation crack body is inclined relative to the ground. The long crack multi-angle crack simulation system comprises the crack simulation device. The application has the advantages of being capable of simulating cracks with different forms, different trends and different inclination angles, and capable of truly restoring the formation cracks.

Description

Technical Field

[0001] This invention relates to the field of crack simulation equipment technology, specifically to a long crack multi-angle crack simulation device and system. Background Technology

[0002] Horizontal well staged volumetric fracturing is a key technology for efficient shale gas development. In the proppant system, fracturing proppant is the main medium for filling fractures. It has the ability to maintain high conductivity of the reservoir and provide a high-speed channel for shale gas to flow into the wellbore. Therefore, the distribution pattern of fracturing proppant in the fracture is an important factor affecting the fracturing effect.

[0003] To study the distribution morphology of fracturing proppant within fractures, indoor experimental devices are commonly used for simulation studies both domestically and internationally. However, the evaluation devices used in Chinese laboratories primarily focus on simulating short fractures. These devices also simulate single, double, or multi-branched fractures, rarely considering factors such as wedge-shaped fractures, the dip angle between fractures and the ground, or the curvature of fracture direction. This leads to relatively large errors between the experimental analysis data and actual conditions. Therefore, it is necessary to design an evaluation device capable of simulating long formation fractures and realizing changes in fracture morphology and multiple angles, to better reflect actual formation conditions and facilitate research on formation fractures. Summary of the Invention

[0004] The purpose of this invention is to address at least one of the aforementioned shortcomings of the prior art. For example, one objective of this invention is to provide a long crack multi-angle crack simulation device capable of simulating cracks of different shapes, orientations, and inclination angles. Another objective of this invention is to provide a long crack multi-angle crack simulation system capable of simulating cracks of different shapes, orientations, and inclination angles.

[0005] To achieve the above objectives, one aspect of the present invention provides a long crack multi-angle crack simulation device, the simulation device comprising a base, a base plate, a telescopic rod, and a crack model body, wherein...

[0006] The base is fixedly set on the ground, and the bottom plate is horizontally set on the base and the bottom plate and the base are hinged together.

[0007] The crack model body is fixedly mounted on the base plate along the length direction of the base plate and is perpendicular to the base plate. The crack model body includes two or more crack models and universal expansion joints connecting two adjacent crack models. The crack model body has a curved or straight shape with a certain length.

[0008] One end of the telescopic rod is connected to the base, and the other end is connected to the bottom plate to push the bottom plate to rotate relative to the base, so that the simulated crack body is tilted relative to the ground.

[0009] In one exemplary embodiment of this invention, the base plate may be a rectangular structure, with one long side of the rectangle hinged to the base, the hinge being implemented by means of a hinge.

[0010] In one exemplary embodiment of this invention, the crack model may include at least one of a flat plate crack model and an irregular crack model.

[0011] In one exemplary embodiment of one aspect of the present invention, both the flat crack model and the irregular crack model may include a box body, two clamping plates, support strips, and bolts, wherein,

[0012] The front and rear sides of the box are open structures. The two clamping plates are set inside the box and are parallel to the left and right sides of the box respectively. The two clamping plates can cooperate with each other to form a simulated crack channel.

[0013] The support bars are fixedly installed on the outer walls of both sides of the box body. One end of the bolt acts on the two clamping plates, and the other end acts on the support bars.

[0014] In one exemplary embodiment of this invention, each of the two clamping plates may have a bent portion protruding to the same side at both ends, wherein the two clamping plates are fitted together through the bent portion.

[0015] In one exemplary embodiment of the present invention, a groove may be provided on the bent portion of one clamping plate, and a protrusion that mates with the groove may be provided on the bent portion of the other clamping plate.

[0016] A spring may also be provided in the groove, and a spring post may also be provided on the protrusion.

[0017] In one exemplary embodiment of one aspect of the present invention, in a flat plate crack model, the support bars can be arranged crosswise on the outside of the box body, one end of the bolt abuts against the clamping plate, and the distance between the two clamping plates is adjusted by adjusting the screwing length of the bolt on the support bar.

[0018] In one exemplary embodiment of one aspect of the present invention, in the irregular crack model, the support bar can be arranged vertically or parallel to the outside of the box body, one end of the bolt is fixedly connected to the clamping plate, and the distance between the two clamping plates is controlled by screwing in and out the bolt.

[0019] In one exemplary embodiment of this invention, the clamp may be made of a transparent material, and the clamp may be a transparent acrylic sheet or glass plate injection molded into an irregular crack shape.

[0020] Another aspect of the present invention is a long crack multi-angle crack simulation system, wherein the simulation system may include the long crack multi-angle crack simulation device as described in any one of claims 1 to 9.

[0021] In another exemplary embodiment of the present invention, the length of the simulated crack body can be 10 to 30 m, and the tilt angle of the simulated crack body relative to the ground can be 0 to 90°.

[0022] In another exemplary embodiment of the present invention, the simulation device may further include an inlet wellbore and an outlet wellbore, which are respectively connected to both ends of the fracture model body to pump proppant into the fracture model body.

[0023] Compared with the prior art, the beneficial effects of the present invention include at least one of the following:

[0024] (1) By adjusting the width and angle of the simulated fractures in the fracture model, this invention can simulate fractures of different shapes, such as wedge-shaped fractures and flat plate fractures; by adopting the irregular fracture model design, it can simulate the fracture morphology in real reservoirs with higher fidelity.

[0025] (2) The present invention uses universal expansion joints to connect the simulated fractures, which can realize the angle change between the fracture models and realize the fracture direction to simulate the change of the formation fracture direction; at the same time, telescopic rods are used to realize the dip angle change of the fracture models and simulate the movement of proppant in fractures with different dip angles.

[0026] (3) The fracture model of the present invention can be assembled into long fractures (10-30 meters) according to experimental requirements, which is closer to the real situation that the main fracture in the reservoir is a long fracture. It can eliminate the influence of the inlet and outlet ends on the proppant migration and settling in the short fracture simulation device, improve the clarity of experimental observation, and reduce the possible errors in the extraction of experimental data due to the small size of the short fracture simulation device. Attached Figure Description

[0027] The above and other objects and / or features of the present invention will become clearer from the following description taken in conjunction with the accompanying drawings, in which:

[0028] Figure 1 A schematic diagram of a long crack multi-angle crack simulation device of an exemplary embodiment of the present invention is shown;

[0029] Figure 2 It shows Figure 1 A structural diagram of the other side;

[0030] Figure 3 A schematic diagram of a long crack multi-angle crack simulation device according to another exemplary embodiment of the present invention is shown;

[0031] Figure 4 It shows Figure 1 or Figure 3 A schematic diagram of an exemplary embodiment of the medium crack model;

[0032] Figure 5 It shows Figure 4 A side view of an exemplary embodiment of the medium crack model (irregular crack model);

[0033] Figure 6 It shows Figure 4 A side view of an exemplary embodiment of the medium crack model (flat plate crack model);

[0034] Figure 7 It shows Figure 4 Right view of the crack model;

[0035] Figure 8 It shows Figure 7 Enlarged view of point A in the middle;

[0036] Figure 9 A schematic diagram of the plate clamp according to an exemplary embodiment of the present invention is shown;

[0037] Figure 10 A top view (plate crack model) of a plate clamp according to an exemplary embodiment of the present invention is shown;

[0038] Figure 11 A top view of a plate clamp according to an exemplary embodiment of the present invention is shown (a flat plate crack model simulating a wedge crack);

[0039] Figure 12 A schematic diagram of the structure after assembling multiple crack models according to an exemplary embodiment of the present invention is shown.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1-Base, 2-Base plate, 3-Telescopic rod, 4-Crack model, 5-Support plate, 6-Hinge, 13-Inlet wellbore, 14-Outlet wellbore, 17-Universal expansion joint, 18-Spring, 19-Spring column, 20-Box body, 21-Sealing rubber, 22-Clamping plate, 23-Bolt, 24-Support bar, 25-Bending part. Detailed Implementation

[0042] In the following description, the long crack multi-angle crack simulation device and system of the present invention will be described in detail with reference to exemplary embodiments.

[0043] In a first exemplary embodiment of the present invention, the long crack multi-angle crack simulation device mainly includes a base, a base plate, a telescopic rod, and a crack model body.

[0044] The base is fixedly mounted on the ground or a flat surface, serving to support the base plate. The base plate is horizontally mounted on the base and is hinged to the base, allowing the base plate to rotate relative to the base. This hinge can be achieved using hinges, pivots, or bearings.

[0045] The fracture model body is fixedly mounted on the base plate along its length and is perpendicular to the base plate. The fracture model body may include two or more fracture models and universal expansion joints connecting adjacent fracture models. Here, by setting universal expansion joints, adjacent fracture models can form a curved shape. Multiple fracture models can be set according to experimental requirements, so that the fracture model body has a curved shape, a straight shape, or a partially curved and partially straight shape with a certain length, so that the simulated long fracture is closer to the actual situation of the formation.

[0046] One end of the telescopic rod is connected to the base, and the other end passes through the upper surface of the base and connects to the side of the base plate that is not connected to the hinge, thereby pushing the base plate to rotate relative to the base, thus causing the simulated crack body to tilt relative to the ground. For example, the telescopic rod can be a hydraulic cylinder, with one end connected to the base and the other end passing through the upper surface of the base and connecting to the lower surface of the base plate that is not hinged to the base. By controlling the length of the telescopic rod, the tilt angle of the simulated crack can be controlled.

[0047] In this exemplary embodiment, the base plate may be a rectangular structure, and the long side located on one side of the rectangle may be hinged to the base, and the hinge is implemented by means of a hinge.

[0048] In this exemplary embodiment, the crack model may include at least one of a flat plate crack model and an irregular crack model.

[0049] In this exemplary embodiment, both the flat crack model and the irregular crack model may include a box, two clamping plates, support bars, and bolts.

[0050] The box-shaped structure has a flat design with openings on the front and rear sides or on the top. Two clamping plates are positioned opposite each other inside the box and are parallel to the left and right sides. These two clamping plates can cooperate to form a simulated crack channel. Support bars are fixed to the outer walls of both sides of the box, with one end of a bolt acting on the two clamping plates and the other end on the support bars. Sealing rubber is provided at both ends of the crack model to seal the gaps between the box and the clamping plates.

[0051] In this exemplary embodiment, each of the two clamping plates may have a bent portion protruding to the same side at both ends, wherein the two clamping plates are fitted together through the bent portion.

[0052] In this exemplary embodiment, a groove may be provided on the bent portion of one clamping plate, and a protrusion that mates with the groove may be provided on the bent portion of the other clamping plate. A spring may also be provided in the groove, and a spring post may also be provided on the protrusion to facilitate the separation of the two clamping plates when the bolt is unscrewed. Here, the width of the bent portion may gradually decrease along the length of the clamping plate, so that when the two clamping plates are fitted together, a wedge-shaped fracture can be simulated. At the same time, placing the wedge-shaped fracture near the wellbore inlet further replicates the fracture morphology near the wellbore in a real reservoir.

[0053] Depending on the specific experimental requirements, flat plate crack models and irregular crack models can be freely combined to form cracks of different shapes.

[0054] In this exemplary embodiment, in the flat plate crack model, the support bars can be arranged crosswise on the outside of the box body, and one end of the bolt abuts against the clamping plate. The distance between the two clamping plates can be adjusted by adjusting the screw length of the bolt on the support bar, thereby adjusting the width of the crack to form parallel cracks or wedge-shaped cracks.

[0055] In this exemplary embodiment, in the irregular crack model, the support bars can be arranged vertically or parallel to the outside of the box body, and one end of the bolt is fixedly connected to the clamping plate. The vertical or parallel design of the support bars increases the density of bolts on the clamping plate. By screwing in and out the bolts, the distance between the two clamping plates can be controlled, and an irregular crack shape can be formed between the clamping plates.

[0056] In this exemplary embodiment, the clamping plate can be made of a transparent material, such as a transparent acrylic sheet or glass plate injection-molded into an irregular crack shape. Specifically, depending on the experimental requirements, in the plate crack model, the clamping plate is made of a transparent material such as glass, which facilitates observation of the proppant migration and settling patterns during the experiment; in the irregular crack model, the clamping plate can be made of easily processed and deformable materials such as copper or aluminum plates, and under the action of bolts, the two clamping plates can easily form an irregular crack shape; the clamping plate can also be a transparent acrylic sheet pre-injected into an irregular crack shape, which facilitates observation of the proppant migration and settling patterns during the experiment.

[0057] Figure 1 A schematic diagram of a long crack multi-angle crack simulation device of an exemplary embodiment of the present invention is shown; Figure 2 It shows Figure 1 A structural diagram of the other side; Figure 3 A schematic diagram of a long crack multi-angle crack simulation device according to another exemplary embodiment of the present invention is shown; Figure 4 It shows Figure 1 or Figure 3 A schematic diagram of an exemplary embodiment of the medium crack model; Figure 5 It shows Figure 4 A side view of an exemplary embodiment of the medium crack model (irregular crack model); Figure 6 It shows Figure 4 A side view of an exemplary embodiment of the medium crack model (flat plate crack model); Figure 7 It shows Figure 4 Right view of the crack model; Figure 8 It shows Figure 7 Enlarged view of point A in the middle; Figure 9 A schematic diagram of the plate clamp according to an exemplary embodiment of the present invention is shown; Figure 10 A top view (plate crack model) of a plate clamp according to an exemplary embodiment of the present invention is shown; Figure 11 A top view of a plate clamp according to an exemplary embodiment of the present invention is shown (a flat plate crack model simulating a wedge crack); Figure 12 A schematic diagram of the structure after assembling multiple crack models according to an exemplary embodiment of the present invention is shown.

[0058] In a second exemplary embodiment of the present invention, as Figures 1-12 As shown, the long crack multi-angle crack simulation device mainly includes a base 1, a base plate 2, a telescopic rod 3, and a crack model body.

[0059] Among them, such as Figure 1 As shown, the base 1 is fixedly mounted on the ground or a flat surface, serving to support the base plate 2. The base plate 2 is horizontally mounted on the base 1 and is hinged to the base 1, allowing the base plate 2 to rotate relative to the base 1. Here, the hinge can be achieved by means of hinges, pivots, or bearings.

[0060] The fracture model body is fixedly installed on the base plate 2 along its length and is perpendicular to the base plate 2. The fracture model body may include two or more fracture models 4 and universal expansion joints 17 connecting adjacent fracture models. Here, by setting universal expansion joints 17, adjacent fracture models 4 can form a curved shape. Support plates 5 are provided on one or both sides of the fracture model 4 to prevent the fracture model 4 from tipping over during tilting. Multiple fracture models 4 are set according to experimental requirements, so that the fracture model body has a curved shape, a straight shape, or a partially curved and partially straight shape with a certain length, so that the simulated long fracture is closer to the actual situation of the formation.

[0061] One end of the telescopic rod 3 is connected to the base, and the other end passes through the upper surface of the base 1 and connects to the side of the base plate 2 that is not hinged to the base 1, thereby pushing the base plate 2 to rotate relative to the base 1, thus causing the simulated crack body to tilt relative to the ground. For example, the telescopic rod can be a hydraulic cylinder, with one end connected to the base and the other end passing through the upper surface of the base and connecting to the lower surface of the side of the base plate that is not hinged to the base. By controlling the length of the telescopic rod, the tilt angle of the simulated crack can be controlled. Here, the length of the simulated crack body can be 10 to 30 m, and the tilt angle of the simulated crack body relative to the ground can be 0 to 90°.

[0062] In this exemplary embodiment, as Figure 2 As shown, the base plate 2 can be a rectangular structure, and the long side of one side of the rectangle can be hinged to the base 1. The hinge is achieved by means of a hinge 6. Here, the base 1 can be... Figure 1 The frame shape in the text can also be... Figure 3 The shape of the bracket in the figure, the telescopic rod 3 can adopt conventional technical means in the field according to the different base 1 and base plate 2.

[0063] In this exemplary embodiment, the crack model 4 may include at least one of a flat plate crack model and an irregular crack model.

[0064] In this exemplary embodiment, as Figures 4-7 As shown, both the flat crack model and the irregular crack model can include a box 20, two clamping plates 22, a support bar 24, and bolts 23.

[0065] The box body 20 has a flat structure, with openings on the front and rear sides or on the top. Two clamping plates 22 are positioned opposite each other inside the box body 20 and are parallel to the left and right sides of the box body 20, respectively. The two clamping plates 22 can cooperate to form a simulated crack channel. Support bars 24 are fixedly mounted on the outer walls of both sides of the box body 20. One end of a bolt 23 acts on the two clamping plates 22, and the other end acts on the support bar 24. Sealing rubber 21 is provided at both ends of the crack model 4 to seal the gaps between the box body 20 and the clamping plates 22.

[0066] In this exemplary embodiment, as Figures 7-10 As shown, further, each of the two clamping plates 22 may have a bent portion 25 protruding to the same side at both ends, wherein the two clamping plates 22 are engaged through the bent portions 25. Further, a groove may be provided on the bent portion 25 of one clamping plate, and a protrusion may be provided on the bent portion 25 of the other clamping plate to engage with the groove. A spring 18 may also be provided in the groove, and a spring post 19 may also be provided on the protrusion to facilitate the separation of the two clamping plates when the bolt is unscrewed. Here, as... Figure 11As shown, the width of the bent portion 25 can gradually decrease along the length of the clamping plate, so that when the two clamping plates are fitted together, a wedge-shaped fracture can be simulated. At the same time, setting the wedge-shaped fracture near the wellbore inlet can better restore the fracture morphology near the wellbore in the real reservoir.

[0067] Depending on different experimental requirements, such as Figure 12 As shown, the flat plate crack model and the irregular crack model can be freely combined to form cracks of different shapes.

[0068] In this exemplary embodiment, as Figure 6 As shown, in the flat plate crack model, the support bars 24 can be arranged crosswise on the outer sides of the left and right planes of the box body 20 (i.e., Figure 7 (On the left and right sides of the middle box body), one end of the bolt 23 abuts against the clamping plate. By adjusting the screw length of the bolt 23 on the support bar 24, the distance between the two clamping plates can be adjusted, thereby adjusting the width of the crack to form parallel cracks or wedge-shaped cracks.

[0069] In this exemplary embodiment, as Figure 5 As shown, in the irregular crack model, the support bars 24 can be vertically or parallelly arranged on the outer side of the left and right planes of the box body 20, and one end of the bolt 23 is fixedly connected to the clamping plate. The vertical or parallel design of the support bars 24 increases the density of the bolts 23 on the clamping plate. By screwing in and out the bolts 23, the distance between the two clamping plates can be controlled, and an irregular crack shape can be formed between the clamping plates.

[0070] In this exemplary embodiment, the clamping plate can be made of a transparent material, such as a transparent acrylic sheet or glass plate injection-molded into an irregular crack shape. Specifically, depending on the experimental requirements, in the plate crack model, the clamping plate is made of a transparent material such as glass, which facilitates observation of the proppant migration and settling patterns during the experiment; in the irregular crack model, the clamping plate can be made of easily processed and deformable materials such as copper or aluminum plates, and under the action of bolts, the two clamping plates can easily form an irregular crack shape; the clamping plate can also be a transparent acrylic sheet pre-injected into an irregular crack shape, which facilitates observation of the proppant migration and settling patterns during the experiment.

[0071] In a third exemplary embodiment of the present invention, the long crack multi-angle crack simulation system may include the long crack multi-angle crack simulation device described in the first or second exemplary embodiment above.

[0072] In this exemplary embodiment, the length of the simulated crack body can be 10 to 30 m, and the tilt angle of the simulated crack body relative to the ground can be 0 to 90°.

[0073] In this exemplary embodiment, as Figure 1As shown, the simulation device may further include an inlet wellbore 13 and an outlet wellbore 14, which are respectively connected to both ends of the fracture model body to pump proppant into the fracture model body. Specifically, an inlet wellbore 13 and an outlet wellbore 14 are respectively provided on the fracture model 4 at the beginning and end of the fracture model body. By pumping proppant and other materials into the fracture model 4, the proppant transport and settlement law and the sand embankment formation process of fracturing fluid in the fracture are simulated, and the proppant migration and settlement law and the sand embankment formation process under different construction parameters are studied.

[0074] In summary, the beneficial effects of the present invention include at least one of the following:

[0075] (1) By adjusting the width and angle of the simulated fractures in the fracture model, this invention can simulate fractures of different shapes, such as wedge-shaped fractures and flat plate fractures; by adopting the irregular fracture model design, it can simulate the fracture morphology in real reservoirs with higher fidelity.

[0076] (2) The present invention uses universal expansion joints to connect the simulated fractures, which can realize the angle change between the fracture models and realize the fracture direction to simulate the change of the formation fracture direction; at the same time, telescopic rods are used to realize the dip angle change of the fracture models and simulate the movement of proppant in fractures with different dip angles.

[0077] (3) The fracture model of the present invention can be assembled into long fractures (10-30 meters) according to experimental requirements, which is closer to the real situation that the main fracture in the reservoir is a long fracture. It can eliminate the influence of the inlet and outlet ends on the proppant migration and settling in the short fracture simulation device, improve the clarity of experimental observation, and reduce the possible errors in the extraction of experimental data due to the small size of the short fracture simulation device.

[0078] Although the present invention has been described above in conjunction with exemplary embodiments and accompanying drawings, those skilled in the art should understand that various modifications can be made to the above embodiments without departing from the spirit and scope of the claims.

Claims

1. A device for simulating long cracks at multiple angles, characterized in that, The simulation device includes a base, a bottom plate, a telescopic rod, and a crack model body, wherein, The base is fixedly set on the ground, and the bottom plate is horizontally set on the base and the bottom plate and the base are hinged together. The crack model body is fixedly mounted on the base plate along the length direction of the base plate and is perpendicular to the base plate. The crack model body includes two or more crack models and universal expansion joints connecting two adjacent crack models. The crack model body has a curved or straight shape with a certain length. One end of the telescopic rod is connected to the base, and the other end is connected to the bottom plate to push the bottom plate to rotate relative to the base, so that the crack model body is tilted relative to the ground; The crack model includes an irregular crack model, or a flat plate crack model and an irregular crack model; both the flat plate crack model and the irregular crack model include a box body, two clamping plates, support strips, and bolts, wherein, The front and rear sides of the box are open. The two clamping plates are arranged opposite each other inside the box and are parallel to the left and right sides of the box respectively. The two clamping plates can cooperate with each other to form a simulated crack channel. The support bars are fixedly installed on the outer walls of both sides of the box body. One end of the bolt acts on the two clamping plates, and the other end acts on the support bars. In the irregular crack model, the support bars are installed vertically or parallel to the outside of the box body. One end of the bolt is fixedly connected to the clamping plate. The distance between the two clamping plates is controlled by screwing in and out the bolt.

2. The long crack multi-angle crack simulation device according to claim 1, characterized in that, The base plate has a rectangular structure, with one long side of the rectangle hinged to the base. The hinge is achieved by means of a hinge.

3. The long crack multi-angle crack simulation device according to claim 1, characterized in that, Each of the two clamping plates has a bent portion protruding to the same side at both ends, and the two clamping plates are fitted together through the bent portion.

4. The long crack multi-angle crack simulation device according to claim 3, characterized in that, A groove is provided on the bent portion of one clamping plate, and a protrusion that mates with the groove is provided on the bent portion of the other clamping plate. A spring is also provided in the groove, and a spring post is also provided on the protrusion.

5. The long crack multi-angle crack simulation device according to claim 1, characterized in that, In the flat plate crack model, the support bars are arranged crosswise on the outside of the box body, and one end of the bolt abuts against the clamping plate. The distance between the two clamping plates is adjusted by adjusting the screw length of the bolt on the support bar.

6. The long crack multi-angle crack simulation device according to claim 1, characterized in that, The clamping plate is made of transparent material, and it is a transparent acrylic sheet or glass plate injection molded into an irregular crack shape.

7. A long crack multi-angle crack simulation system, characterized in that, The simulation system includes the long crack multi-angle crack simulation device as described in any one of claims 1 to 6.

8. The long crack multi-angle crack simulation system according to claim 7, characterized in that, The length of the simulated crack body is 10 to 30 m, and the tilt angle of the simulated crack body relative to the ground is 0 to 90°.

9. The long crack multi-angle crack simulation system according to claim 7, characterized in that, The simulation device also includes an inlet wellbore and an outlet wellbore, which are respectively connected to both ends of the fracture model body to pump proppant into the fracture model body.

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