Hot dry rock in-situ fracturing experiment device with structure size adjusting function

Abstract

The invention discloses a hot dry rock in-situ fracturing experiment device with a structure size adjusting function, and belongs to the technical field of new energy development, the hot dry rock in-situ fracturing experiment device comprises a base and an experiment mechanism, the experiment mechanism comprises a support, a supporting frame, an inner pressure-bearing cavity, an outer pressure-bearing cavity, a contact assembly, an adjusting assembly and an adding assembly; the distance between the contact assembly and the supporting frame can be adjusted through the adjusting assembly, the contact assembly can make full contact with a hot dry rock sample conveniently and conduct heating operation on the hot dry rock sample, the adding assembly is detachably connected with the supporting frame and can be added or detached according to the size of the hot dry rock sample, and when the adding assembly is installed on the supporting frame, the adding assembly can be conveniently detached from the supporting frame. The position of the additionally-installed assembly on the supporting frame is fixed through the connecting assembly, when the adjusting assembly is used, the additionally-installed assembly can be adjusted at the same time, dry hot rock samples of different sizes are in full contact and limited and clamped, and the experiment effect is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of new energy development, and in particular relates to a hot dry rock in-situ fracturing experimental device with adjustable structural dimensions. Background Art

[0002] The geothermal energy contained in the hot dry rocks in the earth's crust is huge and has become a new energy source that countries around the world focus on researching and developing. The field test research of enhanced geothermal engineering for the development of hot dry rock resources requires large investment, long cycle and high risk. Before the on-site fracturing and artificial thermal reservoir construction project, it is necessary to carry out laboratory research on hot dry rock hydraulic fracturing. In order to reduce the risk investment of direct on-site construction, it is necessary to establish such a set of laboratory small-scale large-scale hot dry rock enhanced hydraulic fracturing simulation devices that simulate the on-site, so as to provide parameters and technical support for on-site fracturing process design and reservoir transformation; The existing hot dry rock in-situ fracturing experimental device is not convenient to adjust the size of the experimental device when conducting experiments on hot dry rock samples of different sizes, and it is not convenient to fully limit and clamp the hot dry rock samples during the experimental operation, which affects the experimental effect.

[0003] In order to avoid the above technical problems, it is necessary to provide a hot dry rock in-situ fracturing experimental device with adjustable structural dimensions to overcome the above defects in the prior art. Summary of the invention

[0004] The object of the present invention is to provide a hot dry rock in-situ fracturing experimental device with adjustable structural dimensions to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A hot dry rock in-situ fracturing experimental device with adjustable structural dimensions comprises a base and an experimental mechanism, wherein the experimental mechanism comprises: The bracket is fixedly mounted on the base, a hydraulic loading cylinder is mounted on the bracket, an upper fixing plate is mounted on the output end of the hydraulic loading cylinder, the upper fixing plate is detachably connected to the hydraulic loading cylinder, an injection well pre-buried pipe is arranged inside the hot dry rock sample, an injection well body is arranged inside the injection well pre-buried pipe, a support plate is fixedly mounted on the base, a positioning hole is arranged on the support plate, a support frame is arranged on the support plate, a positioning rod is mounted on the bottom end of the support frame, the positioning rod can extend into the inner side of the positioning hole, an inner pressure-bearing cavity is arranged outside the support frame, and an outer pressure-bearing cavity is arranged outside the inner pressure-bearing cavity, The support frame is provided with a contact component away from the inner pressure cavity, which is used to contact the surface of the hot dry rock sample and heat the hot dry rock sample. An adjustment component is installed between the contact component and the support frame, which is used to adjust the distance between the contact component and the support frame. Additional components are provided on both sides of the support frame, which are used to adjust according to the size of the hot dry rock sample. The additional component is connected to the adjustment component. A connecting component is provided between the additional component and the support frame, which is used to fix the additional component to the support frame.

[0006] As a further technical solution of the present invention: the contact assembly comprises: The contact plate is located on the side of the support frame away from the inner pressure-bearing cavity. A heating rod is installed on the contact plate. An insulation layer is provided on the side of the contact plate close to the support frame. A fixed block is installed on the contact plate. The fixed block is in the shape of a right-angled trapezoid. Two fixed blocks are provided and are symmetrically installed on the contact plate.

[0007] As a further technical solution of the present invention: the adjustment component comprises: The cam is provided with a first end for receiving the first gear and a second end for receiving the first gear, and the second end for receiving the first gear is provided with a second gear, and the cam is provided with a first gear which is connected with the first gear to the first stopper.

[0008] As a further technical solution of the present invention: the additional assembly includes: The positioning groove is located on the side of the supporting frame, and an additional frame is provided on one side of the supporting frame. A positioning block is provided on the additional frame close to the supporting frame, and the positioning block is in a T-shape. The positioning block is slidably connected to the positioning groove. A second slide groove is provided in the middle of the additional frame, and a second rotating rod is installed on the inner side of the second slide groove. A slider is installed on the second rotating rod, and the slider is threadedly connected to the second rotating rod. A driving block is fixedly installed on the slider, and the shape of the driving block is the same as that of the adjusting block. An additional plate is provided on the additional frame close to the driving block, and the additional plate is the same as the contact plate. A heating rod is also installed on the additional plate, and an additional block is installed on the additional plate close to the additional frame, and the additional block has the same shape as the fixed block; A rotating assembly is installed between the second rotating rod and the driving rod, which is used to drive the second rotating rod to perform a synchronous rotation operation when the driving rod rotates, so that the installation plate and the contact plate move synchronously and are in close contact with the hot dry rock sample.

[0009] As a further technical solution of the present invention: the rotating assembly comprises: The transmission gear of the first gear is fixedly mounted on the supporting yoke, and the other end of the short gear is fixedly mounted on the supporting yoke, and the other end of the short gear is fixedly mounted on the supporting yoke, and the other end of the short gear is fixedly mounted on the supporting yoke, and a belt is installed between the first pulley and the second pulley, and a rotating tooth is fixedly mounted on the outer side of the driving rod, and the connection mode when the rotating tooth is connected to the transmission tooth is a meshing connection.

[0010] As a further technical solution of the present invention: the connection assembly comprises: A limiting hole is located on the inner side of the positioning groove, a limiting groove is provided on the mounting frame, a connecting hole is provided on the limiting groove, a horizontal connecting rod is provided on the inner side of the connecting hole, one end of the connecting rod extending out of the connecting frame is semicircular, an elastic part is installed between the other end of the connecting rod and the limiting groove, the shape of the connecting rod located on the inner side of the limiting groove is truncated cone, a vertical adjusting rod is provided on the inner side of the limiting groove, a protrusion is installed on the adjusting rod, the shape of the protrusion is trapezoidal, and the protrusion is located on the bottom side of the connecting rod.

[0011] As a further technical solution of the present invention: a plurality of positioning holes are provided and distributed on the support plate, and a positioning rod is also installed on the bottom side of the additional component for fixing the position of the additional component on the support plate.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides an in-situ hot dry rock fracturing experimental device with an adjustable structural size. The support plate is provided with a plurality of positioning holes, and a positioning rod is installed at the bottom end of the support frame. The support frame can be conveniently installed on the support plate through the positioning rod, and the position can be adjusted. The distance between the contact component and the support frame can be adjusted through the adjustment component, so that the contact component and the hot dry rock sample can be fully contacted and heated. The additional component is detachably connected to the support frame and can be installed or removed according to the size of the hot dry rock sample. When the additional component is installed on the support frame, the position of the additional component on the support frame is fixed by the connecting component. When the adjustment component is used, the additional component can be adjusted at the same time to achieve full contact and limit clamping of hot dry rock samples of different sizes, thereby ensuring the experimental effect and convenient operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the present invention.

[0014] Figure 2 It is a schematic diagram of the structure on the support plate in the present invention.

[0015] Figure 3 It is a schematic diagram of the structure between the inner pressure-bearing cavity and the support frame in the present invention.

[0016] Figure 4 It is a schematic diagram of the structure of the positioning holes on the support plate in the present invention.

[0017] Figure 5 It is a schematic diagram of the structure between the adjustment component and the additional component in the present invention.

[0018] Figure 6 It is a schematic diagram of the structure of the additional components in the present invention.

[0019] Figure 7 It is a schematic diagram of the structure of the positioning groove and the limiting hole in the present invention.

[0020] Figure 8 It is a schematic diagram of the structure of the inner side of the additional component in the present invention.

[0021] Fig. 9 For the present invention Figure 8 Schematic diagram of the structure enlarged at point A in the middle.

[0022] Fig.10 It is a schematic diagram of the structure of the contact plate and the additional plate in the present invention.

[0023] In the accompanying drawings: 1-base, 2-bracket, 3-hydraulic loading cylinder, 4-upper fixed plate, 5-support plate, 6-contact assembly, 61-contact plate, 62-heating rod, 63-fixed block, 7-adjustment assembly, 71-first slide groove, 72-first rotating rod, 73-moving block, 74-adjustment block, 75-first bevel gear, 76-driving rod, 77-handle, 78-second bevel gear, 79-first fixed frame, 8-additional assembly, 81-positioning groove, 82-positioning block, 83-second slide groove, 84-second rotating rod, 85-slider, 86-driving block, 87-additional plate, 88-additional block , 89-rotating component, 891-second fixed frame, 892-third bevel gear, 893-rotating rod, 894-fourth bevel gear, 895-support frame, 896-short rod, 897-transmission tooth, 898-first pulley, 899-second pulley, 890-belt, 8901-rotating tooth, 9-connecting component, 91-limiting hole, 92-limiting groove, 93-connecting hole, 94-connecting rod, 95-elastic part, 96-adjusting rod, 97-bump, 10-positioning hole, 11-positioning rod, 12-support frame, 13-inner pressure-bearing cavity, 14-outer pressure-bearing cavity, 15-installation frame. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0026] like Figures 1 to 10 As shown in the embodiment provided by the present invention, a hot dry rock in-situ fracturing experimental device with adjustable structural dimensions comprises a base 1 and an experimental mechanism, wherein the experimental mechanism comprises: The bracket 2 is fixedly mounted on the base 1, a hydraulic loading cylinder 3 is mounted on the bracket 2, an upper fixed plate 4 is mounted on the output end of the hydraulic loading cylinder 3, the upper fixed plate 4 is detachably connected to the hydraulic loading cylinder 3, an injection well pre-buried pipe is arranged inside the hot dry rock sample, an injection well body is arranged inside the injection well pre-buried pipe, a support plate 5 is fixedly mounted on the base 1, a positioning hole 10 is arranged on the support plate 5, a support frame 12 is arranged on the support plate 5, a positioning rod 11 is mounted on the bottom end of the support frame 12, the positioning rod 11 can extend into the inner side of the positioning hole 10, an inner pressure-bearing cavity 13 is arranged outside the support frame 12, an outer pressure-bearing cavity 14 is arranged outside the inner pressure-bearing cavity 13, The support frame 12 is provided with a contact component 6 away from the inner pressure-bearing cavity 13, which is used to contact the surface of the hot dry rock sample and heat the hot dry rock sample. An adjustment component 7 is installed between the contact component 6 and the support frame 12, which is used to adjust the distance between the contact component 6 and the support frame 12. Additional components 8 are provided on both sides of the support frame 12, which are used to adjust according to the size of the hot dry rock sample. The additional component 8 is connected to the adjustment component 7, and a connecting component 9 is provided between the additional component 8 and the support frame 12, which is used to fix the additional component 8 to the support frame 12.

[0027] In this embodiment, the support plate 5 is provided with a plurality of positioning holes 10, and a positioning rod 11 is installed at the bottom end of the support frame 12. The positioning rod 11 can be used to conveniently install the support frame 12 on the support plate 5, and the position can be adjusted. The distance between the contact component 6 and the support frame 12 can be adjusted by the adjustment component 7, so that the contact component 6 can fully contact the hot dry rock sample and perform a heating operation on it. The additional component 8 is detachably connected to the support frame 12 and can be installed or removed according to the size of the hot dry rock sample. When the additional component 8 is installed on the support frame 12, the position of the additional component 8 on the support frame 12 is fixed by the connection component 9. When the adjustment component 7 is used, the distance between the contact component 6 and the support frame 12 can be adjusted. When the component 7 is installed, the additional component 8 can be adjusted at the same time to achieve full contact and limit clamping of hot dry rock samples of different sizes, thereby ensuring the experimental effect and convenient operation; the inner pressure-bearing cavity 13 and the outer pressure-bearing cavity 14 are provided with various sizes, which are convenient for replacement according to the size of the hot dry rock sample; a plurality of positioning holes 10 are provided and distributed on the support plate 5, and a positioning rod 11 is also installed on the bottom side of the additional component 8, which is used to fix the position of the additional component 8 on the support plate 5. The positioning holes 10 and the positioning rod 11 can facilitate the disassembly and installation of the support frame 12 and the additional component 8, and are convenient for adjusting the structural size, so as to be suitable for hot dry rock samples of different sizes.

[0028] In one embodiment of the present invention, see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 , the contact assembly 6 comprises: The contact plate 61 is located on the side of the support frame 12 away from the inner pressure-bearing cavity 13. A heating rod 62 is installed on the contact plate 61. An insulation layer is provided on the side of the contact plate 61 close to the support frame 12. A fixing block 63 is installed on the contact plate 61. The fixing block 63 is in the shape of a right-angled trapezoid. Two fixing blocks 63 are provided and are symmetrically installed on the contact plate 61.

[0029] The adjustment component 7 comprises: The first slide slot 71 is located on the supporting frame 12, and a first rotating rod 72 is installed inside the first slide slot 71, and a moving block 73 is installed on the first rotating rod 72, and the moving block 73 is threadedly connected to the first rotating rod 72, and the moving block 73 is slidably connected to the first slide slot 71, and an adjusting block 74 is fixedly installed on the moving block 73, and the moving block 73 and the adjusting block 74 are each provided with two and divided into two groups and symmetrically distributed on the first rotating rod 72, and a first bevel gear 75 is fixedly installed on the top of the first rotating rod 72, and a first fixed frame 79 is installed on the top of the supporting frame 12, and a driving rod 76 is installed on the first fixed frame 79, and a handle 77 is installed on one end of the driving rod 76, and a second bevel gear 78 is installed on the other end, and the second bevel gear 78 is meshed with the first bevel gear 75, and the shape of the adjusting block 74 is a right-angled trapezoid, and the inclined surface of the adjusting block 74 is parallel to the inclined surface of the fixed block 63.

[0030] In this embodiment, the contact plate 61 is vertical, and a heating rod 62 is installed on the contact plate 61. The heating rod 62 is provided in multiple numbers and evenly distributed on the contact plate 61, so as to facilitate heating operation of the hot dry rock sample. The contact plate 61 is installed with two symmetrical fixing blocks 63 on the side close to the support frame 12. The fixing blocks 63 are in the shape of a right-angled trapezoid and are used to contact with the adjustment component 7. The distance between the contact plate 61 and the support frame 12 can be quickly adjusted by the adjustment component 7, so that the contact plate 61 is in full contact with the hot dry rock sample. A vertical first slide groove 71 is provided in the middle of the support frame 12, a first rotating rod 72 is installed inside the first slide groove 71, a rolling bearing is installed between the first rotating rod 72 and the support frame 12, the first rotating rod 72 can stably rotate on the support frame 12, the first rotating rod 72 is a threaded rod in this embodiment, a moving block 73 is installed on the first rotating rod 72, and a screw hole is provided on the moving block 73, the inner side of the screw hole is threadedly connected with the outer side of the first rotating rod 72, and the first rotating rod 72 can be rotated to drive the moving block 73 to drive the adjusting block 74 to move along the first rotating rod 72 The movable block 73 and the adjusting block 74 are provided with two and divided into two groups and symmetrically installed on the first rotating rod 72. The first rotating rod 72 is provided with two sections of threads with opposite rotation directions. When the first rotating rod 72 rotates, the two adjusting blocks 74 can be driven to move relative to each other. The adjusting block 74 is in the shape of a right-angled trapezoid. The inclined surface of the adjusting block 74 is parallel to the inclined surface of the fixed block 63. When the two adjusting blocks 74 move relative to each other, the distance between the contact plate 61 and the support frame 12 can be adjusted through the fixed block 63, so that the contact plate 61 is in full contact with the surface of the hot dry rock sample, and the operation is convenient.

[0031] In one embodiment of the present invention, see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 and Fig.10 , the additional assembly 8 comprises: The positioning groove 81 is located on the side of the support frame 12. An additional frame 15 is provided on one side of the support frame 12. A positioning block 82 is provided on the additional frame 15 near the support frame 12. The positioning block 82 is T-shaped. The positioning block 82 is slidably connected with the positioning groove 81. A second slide groove 83 is provided in the middle of the additional frame 15. A second rotating rod 84 is installed inside the second slide groove 83. A slider 85 is installed on the second rotating rod 84. The slider 85 is threadedly connected with the second rotating rod 84. A driving block 86 is fixedly installed on the slider 85. The shape of the driving block 86 is the same as that of the adjusting block 74. An additional plate 87 is provided on the additional frame 15 near the driving block 86. The additional plate 87 is the same as the contact plate 61. A heating rod 62 is also installed on the additional plate 87. An additional block 88 is installed on the additional plate 87 near the additional frame 15. The additional block 88 has the same shape as the fixed block 63. A rotating assembly 89 is installed between the second rotating rod 84 and the driving rod 76 for driving the second rotating rod 84 to perform a synchronous rotation operation when the driving rod 76 rotates, so that the mounting plate 87 and the contact plate 61 move synchronously and come into close contact with the hot dry rock sample.

[0032] The rotating assembly 89 includes: The second fixing frame 891 is fixedly mounted on the top of the mounting frame 15, the third bevel gear 892 is fixedly mounted on the top of the second rotating rod 84, the second fixing frame 891 is mounted with a rotating rod 893, one end of the rotating rod 893 is fixedly mounted with a fourth bevel gear 894, the fourth bevel gear 894 is meshedly connected with the third bevel gear 892, the second fixing frame 891 is fixedly mounted with a supporting frame 895, the rotating rod 893 passes through the supporting frame 895 and is rotatably connected with the supporting frame 895, the supporting frame 895 is away from the first fixing frame 891, and the rotating rod 893 passes through the supporting frame 895 and is rotatably connected with the supporting frame 895. A short rod 896 is installed at one end of the second fixed frame 891, and the short rod 896 is rotatably connected to the support frame 895. A transmission tooth 897 is fixedly installed at one end of the short rod 896, and a first pulley 898 is fixedly installed at the other end of the short rod 896. A second pulley 899 is fixedly installed at the other end of the rotating rod 893, and a belt 890 is installed between the first pulley 898 and the second pulley 899. A rotating tooth 8901 is fixedly installed on the outer side of the driving rod 76, and the connection method when the rotating tooth 8901 is connected to the transmission tooth 897 is a meshing connection.

[0033] The connecting component 9 comprises: The limiting hole 91 is located on the inner side of the positioning groove 81, and the mounting frame 15 is provided with a limiting groove 92. The limiting groove 92 is provided with a connecting hole 93. A horizontal connecting rod 94 is provided on the inner side of the connecting hole 93. The connecting rod 94 extends out of the connecting frame at one end and is semicircular. An elastic member 95 is installed between the other end of the connecting rod 94 and the limiting groove 92. The connecting rod 94 is located at one end of the inner side of the limiting groove 92 and is truncated. A vertical adjusting rod 96 is provided on the inner side of the limiting groove 92. A protrusion 97 is installed on the adjusting rod 96. The protrusion 97 is trapezoidal in shape and is located on the bottom side of the connecting rod 94.

[0034] In this embodiment, a vertical positioning groove 81 is provided on the side of the support frame 12, and a positioning block 82 is provided on the side of the installation frame 15 close to the support frame 12. The positioning block 82 is slidably connected with the positioning groove 81. The installation frame 15 can be quickly installed on the support frame 12 through the positioning block 82 and the positioning groove 81. A second slide groove 83 and a second rotating rod 84 are provided in the middle of the installation frame 15. The second rotating rod 84 is a threaded rod in this embodiment. A slider 85 is provided on the second rotating rod 84. The slider 85 is slidably connected with the second slide groove 83. A screw hole is provided on the slider 85. The inner side of the screw hole is threadedly connected with the second rotating rod 84. A driving block 86 is fixedly installed on the slider 85. The driving block 86 has the same shape as the adjusting block 74. The slider 85 and the driving block 86 are both provided with two and are divided into two groups and symmetrically installed on the second rotating rod 84. The second rotating rod 84 is provided with threads at both ends with opposite rotation directions. When the second rotating rod 84 rotates, the two sliders 85 can be driven to move relative to each other. A mounting plate 87 is provided on one side of the mounting frame 15. The mounting plate 87 is the same as the contact plate 61. A heating rod 62 is also installed on the mounting plate 87. The width of the mounting plate 87 is the same as the width of the mounting frame 15. The width of the contact plate 61 is the same as the width of the support frame 12. A mounting block 88 is installed on the mounting plate 87. The shape of the mounting block 88 is the same as the shape of the fixed block 63. When the second rotating rod 84 rotates, the driving block 86 can push the mounting block 88 to move, and further adjust the distance between the mounting plate 87 and the mounting frame 15. When the adjustment component 7 is working, the first rotating rod 72 and the second rotating rod 84 can be rotated synchronously through the rotating component 89, so that the mounting plate 87 and the contact plate 61 can be moved synchronously, so as to achieve full contact with hot dry rock samples of different sizes and perform limit clamping operations; A second fixed frame 891 is installed on the top of the mounting frame 15, a third bevel gear 892 is fixedly installed on the top of the second rotating rod 84, a support frame 895 is installed on the second fixed frame 891, rolling bearings are installed between the rotating rod 893 and the support frame 895 and the second fixed frame 891, the rotating rod 893 can perform stable rotation operation on the support frame 895 and the second fixed frame 891, the fourth bevel gear 894 at one end of the rotating rod 893 is meshed and connected with the third bevel gear 892, and a second pulley 899 is fixedly installed on the other end of the rotating rod 893, a short rod 896 is installed on the end of the support frame 895 away from the second fixed frame 891, a rolling bearing is installed between the short rod 896 and the support frame 895, a transmission tooth 897 is fixedly installed on one end of the short rod 896, and a first pulley 898 is fixedly installed on the other end. 898 and the second pulley 899 are connected by a belt 890. A rotating tooth 8901 is fixedly installed on the outer side of the driving rod 76. When the mounting frame 15 is connected to the support frame 12, the rotating tooth 8901 is connected to the transmission tooth 897, and the connection method is a meshing connection. When the driving rod 76 rotates, the rotating rod 893 can be rotated by the rotating tooth 8901, the transmission rod, the short rod 896, the first pulley 898, the second pulley 899 and the belt 890, and the second rotating rod 84 can be further rotated. The rotating tooth 8901 is the same size as the transmission tooth 897, and the first rotating rod 72 and the second rotating rod 84 can be rotated synchronously, ensuring that the contact plate 61 and the mounting plate 87 can move synchronously. In order to ensure the stability of the connection between the rotating tooth 8901 and the transmission tooth 897, the mounting component 8 can be fixed on the support frame 12 through the connecting component 9; A limiting hole 91 is provided on the inner side of the positioning groove 81, and the limiting hole 91 is horizontal. A limiting groove 92 is provided on the side of the mounting frame 15 close to the supporting frame 12, and a horizontal connecting hole 93 is provided on the limiting groove 92. A horizontal connecting rod 94 is provided on the inner side of the connecting hole 93. The connecting rod 94 extends out of one end of the connecting hole 93 in a semicircular shape. The connecting rod 94 is slidably connected to the limiting hole 91, and an elastic member 95 is installed on the other end of the connecting rod 94. The elastic member 95 can be a spring or rubber, etc. In this embodiment, the elastic member 95 is a spring, and the connecting rod 94 can be extended into the limiting hole 91 through the elastic member 95. The inner side of the hole 91 fixes the mounting frame 15 on the supporting frame 12. A vertical adjusting rod 96 is also provided on the inner side of the limiting groove 92. A protrusion 97 is fixedly mounted on the adjusting rod 96. The shape of the connecting rod 94 close to the elastic member 95 is truncated. When the adjusting rod 96 is manually pulled upward to move, the connecting rod 94 is squeezed by the protrusion 97 to compress the elastic member 95, so that the connecting rod 94 is disengaged from the limiting hole 91. At this time, it is convenient to remove the mounting frame 15 from the supporting frame 12, and the operation is convenient. When the connecting rod 94 is connected to the limiting hole 91, the rotating tooth 8901 is meshed with the transmission tooth 897.

[0035] The working principle of the present invention is: In the present invention, firstly, it is selected whether to install the additional component 8 according to the size of the hot dry rock sample. When the additional component 8 needs to be installed, the positioning rod 11 at the bottom of the support frame 12 is extended into the positioning hole 10 on the support plate 5 according to the size of the hot dry rock sample, and the support frame 12 is preliminarily positioned. Then, the matching inner pressure-bearing cavity 13 and outer pressure-bearing cavity 14 are selected for installation, and then the additional frame 15 is installed along the positioning groove 81. When the connecting rod 94 is extended into the limiting hole 91, the installation of the additional frame 15 is completed. At this time, the positioning rod 11 at the bottom end of the mounting frame 15 extends into the positioning hole 10, and the rotating tooth 8901 is meshed with the transmission tooth 897, and then the contact plate 61 and the mounting plate 87 are installed so that the contact plate 61 and the mounting plate 87 are located between the hot dry rock sample and the support frame 12, and then the driving rod 76 is rotated to realize the synchronous rotation operation of the first rotating rod 72 and the second rotating rod 84, so that the contact plate 61 and the mounting plate 87 are in full contact with the surface of the hot dry rock sample, thereby completing the position definition of the hot dry rock sample.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0037] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A hot dry rock in-situ fracturing experimental device with adjustable structural dimensions, comprising a base (1) and an experimental mechanism, characterized in that: The experimental institutions include: A bracket (2) is fixedly mounted on the base (1); a hydraulic loading cylinder (3) is mounted on the bracket (2); an upper fixing plate (4) is mounted on the output end of the hydraulic loading cylinder (3); the upper fixing plate (4) is detachably connected to the hydraulic loading cylinder (3); an injection well pre-buried pipe is arranged inside the hot dry rock sample; an injection well body is arranged inside the injection well pre-buried pipe; a support plate (5) is fixedly mounted on the base (1); a positioning hole (10) is arranged on the support plate (5); a support frame (12) is arranged on the support plate (5); a positioning rod (11) is mounted on the bottom end of the support frame (12); the positioning rod (11) can extend into the inner side of the positioning hole (10); an inner pressure-bearing cavity (13) is arranged outside the support frame (12); an outer pressure-bearing cavity (14) is arranged outside the inner pressure-bearing cavity (13); The support frame (12) is provided with a contact component (6) away from the inner pressure-bearing cavity (13), which is used to contact the surface of the hot dry rock sample and heat the hot dry rock sample. An adjustment component (7) is installed between the contact component (6) and the support frame (12), which is used to adjust the distance between the contact component (6) and the support frame (12). Both sides of the support frame (12) are provided with additional components (8), which are used to adjust according to the size of the hot dry rock sample. The additional components (8) are connected to the adjustment components (7). A connecting component (9) is provided between the additional components (8) and the support frame (12), which is used to fix the additional components (8) to the support frame (12).

2. The hot dry rock in-situ fracturing experimental device with adjustable structural dimensions according to claim 1, characterized in that: The contact assembly (6) comprises: A contact plate (61) is located on a side of the support frame (12) away from the inner pressure-bearing cavity (13); a heating rod (62) is installed on the contact plate (61); a heat-insulating layer is provided on a side of the contact plate (61) close to the support frame (12); a fixing block (63) is installed on the contact plate (61); the fixing block (63) is in the shape of a right-angled trapezoid; two fixing blocks (63) are provided and are symmetrically installed on the contact plate (61).

3. The hot dry rock in-situ fracturing experimental device with adjustable structural dimensions according to claim 2, characterized in that: The regulating component (7) comprises: A first slide groove (71) is located on the support frame (12); a first rotating rod (72) is installed inside the first slide groove (71); a moving block (73) is installed on the first rotating rod (72); the moving block (73) is threadedly connected to the first rotating rod (72); the moving block (73) is slidably connected to the first slide groove (71); an adjusting block (74) is fixedly installed on the moving block (73); the moving block (73) and the adjusting block (74) are each provided with two and divided into two groups and symmetrically distributed on the first rotating rod (72); ), a first bevel gear (75) is fixedly mounted on the top of the first rotating rod (72), a first fixing frame (79) is mounted on the top of the supporting frame (12), a driving rod (76) is mounted on the first fixing frame (79), a handle (77) is mounted on one end of the driving rod (76), and a second bevel gear (78) is mounted on the other end, the second bevel gear (78) is meshingly connected with the first bevel gear (75), the shape of the adjusting block (74) is a right-angled trapezoid, and the inclined surface of the adjusting block (74) is parallel to the inclined surface of the fixing block (63).

4. The hot dry rock in-situ fracturing experimental device with adjustable structural dimensions according to claim 3, characterized in that: The mounting assembly (8) comprises: A positioning groove (81) is located on the side of the support frame (12); a mounting frame (15) is provided on one side of the support frame (12); a positioning block (82) is provided on the side of the mounting frame (15) close to the support frame (12); the positioning block (82) is T-shaped; the positioning block (82) is slidably connected to the positioning groove (81); a second sliding groove (83) is provided in the middle of the mounting frame (15); a second rotating rod (84) is installed inside the second sliding groove (83); a sliding block (85) is installed on the second rotating rod (84); the sliding block (85) is connected to the positioning groove (81) and the second rotating rod (84 ... The second rotating rod (84) is threadedly connected, a driving block (86) is fixedly mounted on the slider (85), the driving block (86) has the same shape as the adjusting block (74), a mounting plate (87) is provided on the side of the mounting frame (15) close to the driving block (86), the mounting plate (87) is the same as the contact plate (61), a heating rod (62) is also mounted on the mounting plate (87), a mounting block (88) is mounted on the side of the mounting plate (87) close to the mounting frame (15), the mounting block (88) has the same shape as the fixed block (63); A rotating assembly (89) is installed between the second rotating rod (84) and the driving rod (76) for driving the second rotating rod (84) to perform a synchronous rotation operation when the driving rod (76) rotates, so that the mounting plate (87) and the contact plate (61) move synchronously and come into close contact with the hot dry rock sample.

5. The hot dry rock in-situ fracturing experimental device with adjustable structural dimensions according to claim 4, characterized in that: The rotating assembly (89) comprises: A second fixed frame (891) is fixedly mounted on the top of the mounting frame (15); a third bevel gear (892) is fixedly mounted on the top of the second rotating rod (84); a rotating rod (893) is mounted on the second fixed frame (891); a fourth bevel gear (894) is fixedly mounted on one end of the rotating rod (893); the fourth bevel gear (894) is meshingly connected with the third bevel gear (892); a supporting frame (895) is fixedly mounted on the second fixed frame (891); the rotating rod (893) passes through the supporting frame (895) and is rotatably connected with the supporting frame (895); the supporting frame (895) is away from the second fixed frame (891); A short rod (896) is installed at one end of the fixed frame (891), and the short rod (896) is rotatably connected to the support frame (895). A transmission tooth (897) is fixedly installed at one end of the short rod (896), and a first pulley (898) is fixedly installed at the other end of the short rod (896). A second pulley (899) is fixedly installed at the other end of the rotating rod (893), and a belt (890) is installed between the first pulley (898) and the second pulley (899). A rotating tooth (8901) is fixedly installed on the outer side of the driving rod (76), and the connection mode when the rotating tooth (8901) is connected to the transmission tooth (897) is a meshing connection.

6. The hot dry rock in-situ fracturing experimental device with adjustable structural dimensions according to claim 5, characterized in that: The connecting component (9) comprises: The limiting hole (91) is located inside the positioning groove (81); the mounting frame (15) is provided with a limiting groove (92); the limiting groove (92) is provided with a connecting hole (93); a horizontal connecting rod (94) is provided inside the connecting hole (93); one end of the connecting rod (94) extending out of the connecting frame is semicircular; an elastic member (95) is installed between the other end of the connecting rod (94) and the limiting groove (92); the end of the connecting rod (94) located inside the limiting groove (92) is truncated cone-shaped; a vertical adjusting rod (96) is provided inside the limiting groove (92); a protrusion (97) is installed on the adjusting rod (96); the protrusion (97) is trapezoidal in shape; the protrusion (97) is located on the bottom side of the connecting rod (94).

7. The hot dry rock in-situ fracturing experimental device with adjustable structural dimensions according to claim 1, characterized in that: A plurality of positioning holes (10) are provided and distributed on the support plate (5), and a positioning rod (11) is also installed on the bottom side of the mounting component (8) for fixing the position of the mounting component (8) on the support plate (5).

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