A true tri-axial fracturing simulation test device with fracturing fluid recovery function

Abstract

The application discloses a true triaxial fracturing simulation test device with a fracturing fluid recovery function, which comprises a pressurization simulation unit for pressurizing a test block, the pressurization simulation unit being fixedly arranged at the upper surface of a fixed base; a fracturing fluid injection unit for fracturing fluid injection, the fracturing fluid injection unit being fixedly installed at the upper surface of the fixed base, and the fracturing fluid injection unit being capable of controlling the injection speed of the fracturing fluid; and a leakage recovery unit for recovering the leaked fracturing fluid, the leakage recovery unit being installed on the pressurization simulation unit and the fixed base, and the leakage recovery unit being capable of absorbing and recovering the leaked fracturing fluid. The test block is pressurized by the pressurization simulation unit, and the fracturing fluid is injected by the fracturing fluid injection unit, so that the fracturing simulation experiment is realized. Meanwhile, the speed of the injected fracturing fluid can be effectively controlled by the fracturing fluid injection unit.

Description

Technical Field

[0001] This application relates to the field of fracturing simulation experiments, and in particular to a true triaxial fracturing simulation test device with fracturing fluid recovery function. Background Technology

[0002] Fracturing is a process in which a high-pressure pump at the surface injects a fluid of a certain viscosity into the oil reservoir through the wellbore. When the injection pressure exceeds the formation fracturing pressure, fractures form in the formation. If more fluid is injected, the fractures continue to extend. To keep the fractures open, a fluid containing proppant is injected into the reservoir. This process is called fracturing, and appropriate experimental equipment is required for fracturing simulation experiments.

[0003] The existing patent document "CN113417615B A Dry Hot Rock Fracturing Injection and Production Simulation Experimental Device" discloses an experimental device. Although this experimental device can conduct fracturing simulation experiments, during the experiment, the fracturing fluid may be injected too quickly due to accidental breakage of the test block or operational errors. Injecting the fracturing fluid too quickly can easily lead to fracturing fluid leakage. Since fracturing fluid usually has high pressure and viscosity, once leakage occurs, it may cause harm to the experimental equipment, experimental personnel and the environment. In other words, existing technologies have the following technical problems: ordinary experimental devices are prone to injecting fracturing fluid too quickly, leading to fracturing fluid leakage and other hazards. Therefore, to address the above problems, a true triaxial fracturing simulation experimental device with fracturing fluid recovery function is proposed. Summary of the Invention

[0004] This embodiment provides a true triaxial fracturing simulation test device with fracturing fluid recovery function to solve the problem that ordinary test devices in the prior art are prone to injecting fracturing fluid too quickly, which leads to fracturing fluid leakage hazards.

[0005] According to one aspect of this application, a true triaxial fracturing simulation test device with fracturing fluid recovery function is provided, the true triaxial fracturing simulation test device with fracturing fluid recovery function comprising: A pressure simulation unit for pressurizing a test block is fixedly mounted on the upper surface of a fixed base. A fracturing fluid injection unit for fracturing fluid injection, wherein the fracturing fluid injection unit is fixedly installed on the upper surface of the fixed base, and the fracturing fluid injection unit can control the fracturing fluid injection too quickly; A leakage recovery unit for recovering leaked fracturing fluid is installed on a pressurized simulation unit and a fixed base. The leakage recovery unit absorbs and recovers the leaked fracturing fluid.

[0006] Furthermore, the pressurization simulation unit includes a fixed chamber, pressurization cylinders, pressurization plates, and pressurization fixing plates. The fixed chamber is fixedly installed on the upper surface of the fixed base. Three pressurization fixing plates are fixedly installed in the inner cavity of the fixed chamber. The three pressurization fixing plates are respectively fixedly installed on the bottom inner wall and the two side walls of the fixed chamber. Three pressurization cylinders are installed on the fixed chamber. The three pressurization cylinders are respectively fixedly installed on the upper wall and the two side walls of the fixed chamber. A pressurization plate is fixedly installed at one end of each of the three pressurization cylinders, and the three pressurization plates correspond to the three pressurization fixing plates.

[0007] Furthermore, the test block is equipped with an optical fiber sensing cable, which is connected to an optical fiber monitoring device.

[0008] Furthermore, the fracturing fluid injection unit includes an injection pump, a fracturing fluid injection pipe, a circular fixed shell A, and a circular fixed shell B. The injection pump is fixedly installed on the upper surface of the fixed base, and one end of the fracturing fluid injection pipe is connected to the injection pump. The other end of the fracturing fluid injection pipe is connected to the test block.

[0009] Furthermore, a circular fixed shell A is connected to the fracturing fluid injection pipe. The inner cavity of the circular fixed shell A is connected to the inner cavity of the fracturing fluid injection pipe. A rotating shaft A is rotatably connected to the inner cavity of the circular fixed shell A. A fixed sleeve is fixedly connected to the arc-shaped wall of the rotating shaft A. A second connecting plate is fixedly installed on the arc-shaped wall of the fixed sleeve. Several second connecting plates are provided, and several second connecting plates are equidistantly fixed on the arc-shaped wall of the fixed sleeve.

[0010] Furthermore, a circular fixed shell B is fixedly connected to the side wall of the circular fixed shell A, and a rotating shaft B is rotatably connected to the inner cavity side wall of the circular fixed shell B. One end of the rotating shaft B is fixedly connected to one end of the rotating shaft A. Fixed sleeve rods are fixedly connected to both sides of the arc-shaped wall of the rotating shaft B. A movable rod is slidably connected in the inner cavity of the fixed sleeve rod. A connecting ball is fixedly connected to one end of the movable rod, and a connecting spring is fixedly connected to the other end of the movable rod. The other end of the connecting spring is fixedly connected to the inner cavity side wall of the fixed sleeve rod.

[0011] Furthermore, a friction rubber sheet is fixedly connected to the arc-shaped inner wall of the circular fixed shell B.

[0012] Furthermore, the leakage recovery unit includes a rotating shaft C, a flower-shaped disc, a fixed cylinder, a first connecting plate, a contact wheel, a receiving disc, and a storage bin. The rotating shaft C is fixedly installed at the center of the flower-shaped disc, and one end of the rotating shaft C is fixedly connected to one end of the rotating shaft B.

[0013] Furthermore, the fixed cylinder is fixedly mounted on the upper surface of the fixed base. A movable piston is slidably connected in the inner cavity of the fixed cylinder. One end of a push rod is fixedly connected to the upper surface of the movable piston. The other end of the push rod penetrates the upper wall of the inner cavity of the fixed cylinder and extends to the outside of the wall. A first connecting plate is fixedly connected to the top end of the push rod. A contact wheel is rotatably connected to the upper surface of the first connecting plate. The outer surface of the contact wheel contacts the side of the flower-shaped disc. A sliding rod is fixedly connected to the bottom surface of the first connecting plate. The sliding rod slides in conjunction with the support sleeve rod. The bottom end of the support sleeve rod is fixedly connected to the upper surface of the fixed base. One end of a return spring is fixedly connected to the bottom end of the sliding rod. The other end of the return spring is fixedly connected to the bottom wall of the inner cavity of the support sleeve rod.

[0014] Furthermore, the receiving plate is disposed in the inner cavity of the fixed chamber and positioned below the test block. A connecting pipe connects the receiving plate to the storage chamber. One end of an air inlet pipe is fixedly connected to the inner cavity of the storage chamber, and the other end of the air inlet pipe extends into the inner cavity of the fixed cylinder and is fixedly connected to the fixed cylinder. A one-way valve is provided on the air inlet pipe. An air outlet pipe is fixedly connected to the inner cavity of the fixed cylinder, and a one-way valve is installed on the air outlet pipe.

[0015] Through the above embodiments of this application, the test block is pressurized by the pressurization simulation unit, and fracturing fluid is injected by the fracturing fluid injection unit to realize the fracturing simulation experiment. At the same time, this application can effectively control the injection speed of fracturing fluid through the fracturing fluid injection unit, thereby effectively avoiding the problem of fracturing leakage caused by the test block being pressurized and broken due to excessive fracturing fluid input. It can also avoid the problem of large-scale leakage caused by sudden rapid output of fracturing fluid when the test block breaks. This application has a leakage recovery unit, which can automatically absorb and recover the leaked fracturing fluid during the fracturing fluid input experiment, thereby effectively avoiding pollution caused by fracturing fluid leakage and achieving better safety. It solves the problem of difficulty in quickly handling and recovering fracturing fluid after leakage in ordinary fracturing simulation devices in the prior art, and is suitable for widespread use. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall three-dimensional structure of one embodiment of this application; Figure 2 This is a schematic diagram of the structure of a pressurization simulation unit according to an embodiment of this application; Figure 3 This is a schematic diagram of the internal structure of a pressurization simulation unit according to an embodiment of this application; Figure 4 This is a schematic diagram of the overall structure of a test block according to an embodiment of this application; Figure 5 This is a schematic diagram of the connection of a fracturing fluid injection unit according to an embodiment of this application; Figure 6 This is a schematic diagram of the connection of a circular fixed shell A according to an embodiment of this application; Figure 7 This is a schematic diagram of the internal structure of a circular fixed shell A according to an embodiment of this application; Figure 8 This is a schematic diagram of the internal structure of a circular fixed shell B according to an embodiment of this application; Figure 9 This is a schematic diagram of the internal structure of a fixed sleeve rod according to an embodiment of this application; Figure 10 This is a schematic diagram of the connection of a flower-shaped plate according to an embodiment of this application; Figure 11 This is a schematic diagram of the internal structure of a fixed cylinder according to an embodiment of this application; Figure 12 This is a schematic diagram of the internal structure of a support sleeve rod according to an embodiment of this application; Figure 13 This is a schematic diagram of the connection structure of a storage compartment according to one embodiment of this application; Figure 14 This is a schematic diagram of an optical fiber sensing cable according to an embodiment of this application.

[0018] In the diagram: 1. Fixed base; 2. Pressurization simulation unit; 3. Test block; 4. Fiber optic sensing cable; 5. Fracturing fluid injection unit; 6. Leakage recovery unit; 7. Fixed chamber; 8. Pressurization cylinder; 9. Pressurization plate; 10. Pressurization fixing plate; 11. Injection pump; 12. Fracturing fluid injection pipe; 13. Circular fixed shell A; 14. Circular fixed shell B; 15. Rotating shaft A; 16. Fixing sleeve; 17. Second connecting plate; 18. Rotating shaft B; 9. Fixed sleeve rod; 20. Moving rod; 21. Connecting ball; 22. Connecting spring; 23. Friction rubber sheet; 24. Rotating shaft C; 25. Flower-shaped disc; 26. Fixed cylinder; 27. Moving piston; 28. Push rod; 29. ​​First connecting plate; 30. Contact wheel; 31. Air outlet pipe; 32. Air inlet pipe; 33. Support sleeve rod; 34. Sliding rod; 35. Return spring; 36. Receiving plate; 37. Storage compartment; 38. Connecting pipe. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0020] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0021] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0022] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0023] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0024] Please see Figure 1As shown, a true triaxial fracturing simulation test device with fracturing fluid recovery function is provided. The true triaxial fracturing simulation test device with fracturing fluid recovery function includes: A pressure simulation unit 2 for pressurizing the test block 3 is fixedly installed on the upper surface of the fixed base 1. The fracturing fluid injection unit 5 is used for fracturing fluid injection. The fracturing fluid injection unit 5 is fixedly installed on the upper surface of the fixed base 1. The fracturing fluid injection unit 5 can control the fracturing fluid injection too quickly. A leakage recovery unit 6 is used for recovering leaked fracturing fluid. The leakage recovery unit 6 is installed on the pressurization simulation unit 2 and the fixed base 1. The leakage recovery unit 6 absorbs and recovers the leaked fracturing fluid. This application uses the pressurization simulation unit 2 to pressurize the test block 3 and the fracturing fluid injection unit 5 to inject fracturing fluid to achieve a fracturing simulation experiment. At the same time, this application can effectively control the injection speed of fracturing fluid through the fracturing fluid injection unit 5, thereby effectively avoiding the problem of fracturing leakage caused by the test block 3 being pressurized and broken due to excessively rapid input of fracturing fluid. It can also avoid the problem of large-scale leakage caused by the sudden rapid output of fracturing fluid when the test block 3 breaks.

[0025] For further technical solutions, please refer to Figure 2 , Figure 3 and Figure 4 As shown, the pressurization simulation unit 2 includes a fixed chamber 7, pressurization cylinders 8, pressurization plates 9, and pressurization fixing plates 10. The fixed chamber 7 is fixedly installed on the upper surface of the fixed base 1. Three pressurization fixing plates 10 are fixedly installed inside the fixed chamber 7, one on the bottom inner wall and one on each of the two side walls. Three pressurization cylinders 8 are installed on the fixed chamber 7. Each of the three pressurizing cylinders 8 is fixedly installed on the upper wall and two side walls of the fixed chamber 7. Each of the three pressurizing cylinders 8 has a pressurizing plate 9 fixedly installed at one end. The three pressurizing plates 9 correspond to the three pressurizing fixed plates 10. When an experiment is to be conducted, the test block 3 is placed between the pressurizing fixed plate 10 and the pressurizing plate 9. The pressurizing cylinder 8 can push the pressurizing plate 9 to move, thereby pressurizing the test block 3 along the X, Y and Z axes through the pressurizing plate 9, thereby simulating the application of rigid load to simulate triaxial stress. The test block 3 is equipped with an optical fiber sensing cable 4, which is connected to an optical fiber monitoring device, such as... Figure 14As shown, before use, the length of the sensing segment of the optical fiber is calculated in advance. A wire longer than the length of the sensing segment is used as the support for the optical fiber. To ensure that the optical fiber can have a signal, the wire is bent into a U-shape as required for the experiment. The bending angle should not be too large to avoid loss of optical fiber signal. The optical fiber is tied to the wire with cotton thread and optical fiber adhesive is applied in dots.

[0026] For specific technical solutions, please refer to Figure 5 , Figure 6 and Figure 7 As shown, the fracturing fluid injection unit 5 includes an injection pump 11, a fracturing fluid injection pipe 12, a circular fixed shell A13, and a circular fixed shell B14. The injection pump 11 is fixedly installed on the upper surface of the fixed base 1. One end of the fracturing fluid injection pipe 12 is connected to the injection pump 11, and the other end of the fracturing fluid injection pipe 12 is connected to the test block 3. The fracturing fluid is injected into the interior of the test block 3 through the fracturing fluid injection pipe 12 by the operation of the injection pump 11 to carry out fracturing experiments. A circular fixed shell A13 is connected to the fracturing fluid injection pipe 12. The inner cavity of the circular fixed shell A13 is connected to the inner cavity of the fracturing fluid injection pipe 12. A rotating shaft A15 is rotatably connected to the inner cavity of the circular fixed shell A13. A fixed sleeve 16 is fixedly connected to the arc-shaped wall of the rotating shaft A15. A second connecting plate 17 is fixedly installed on the arc-shaped wall of the fixed sleeve 16. Several second connecting plates 17 are provided and are equidistantly fixed on the arc-shaped wall of the fixed sleeve 16. The fracturing fluid is transported through the fracturing fluid injection pipe 12, so that the fracturing fluid is transported through the circular fixed shell A13. When the fracturing fluid flows through the inner cavity of the circular fixed shell A13, the flow of the liquid pushes the second connecting plate 17 to rotate, thereby driving the fixed sleeve 16 to rotate. The rotation of the fixed sleeve 16 drives the rotating shaft A15 to rotate. When the fracturing fluid flow rate is high, it can accelerate the rotation of the second connecting plate 17, thereby increasing the rotation speed of the fixed sleeve 16.

[0027] For a preferred technical solution, please refer to Figure 8 and Figure 9 As shown, a circular fixed shell B14 is fixedly connected to the side wall of the circular fixed shell A13. A rotating shaft B18 is rotatably connected to the inner cavity side wall of the circular fixed shell B14. One end of the rotating shaft B18 is fixedly connected to one end of the rotating shaft A15. Fixed sleeve rods 19 are fixedly connected to both sides of the arc-shaped wall of the rotating shaft B18. A moving rod 20 is slidably connected to the inner cavity of the fixed sleeve rod 19. A connecting ball 21 is fixedly connected to one end of the moving rod 20. A connecting spring 22 is fixedly connected to one end of the moving rod 20. The other end of the connecting spring 22 is fixedly connected to the inner cavity side wall of the fixed sleeve rod 19. A friction rubber sheet 23 is fixedly connected to the arc-shaped inner wall of the circular fixed shell B14. When the fracturing fluid flows in the fracturing fluid injection pipe 12, it drives the rotating shaft A15 to rotate. This rotation of shaft A15 drives the rotating shaft B18 to rotate, which in turn drives the fixed sleeve 19 to rotate, causing the connecting ball 21 to rotate in a ring. When the fracturing fluid flow rate is slow, the rotating shaft A15 rotates at a slow speed, causing the rotating shaft B18 to rotate slowly, and thus the connecting ball 21 to rotate slowly. When the fracturing fluid inside the fracturing fluid injection pipe 12 flows rapidly, it drives the rotating shaft A15 to rotate rapidly, which in turn drives the rotating shaft B18 to rotate rapidly, causing the connecting ball 21 to rotate rapidly. As the speed increases, due to centrifugal force, the connecting ball... As the ball 21 moves due to its increased speed, it comes into contact with the friction rubber sheet 23 on the inner wall of the circular fixed shell B14. This contact generates friction, which in turn controls and slows down the rotational speed of the rotating shaft B18, thereby controlling and slowing down the rotational speed of the rotating shaft A15, and consequently controlling the rotational speed of the second connecting plate 17. The reduced rotational speed of the second connecting plate 17, due to its blocking effect, slows down the fracturing fluid flow rate. Thus, through this technical solution, the fracturing fluid flow rate can be controlled when it is rapidly injected into the test block 3, preventing problems such as insufficient fracture extension or proppant blockage caused by rapid injection of fracturing fluid in a short time. It also prevents large-scale leakage caused by rapid fracturing fluid output when the test block 3 breaks.

[0028] For further technical solutions, please refer to Figure 10 , Figure 11 , Figure 12 and Figure 13 As shown, the leakage recovery unit 6 includes a rotating shaft C24, a flower-shaped disc 25, a fixed cylinder 26, a first connecting plate 29, a contact wheel 30, a receiving disc 36, and a storage chamber 37. The rotating shaft C24 is fixedly installed at the center of the flower-shaped disc 25. One end of the rotating shaft C24 is fixedly connected to one end of the rotating shaft B18. When the rotating shaft B18 rotates, it can simultaneously drive the rotating shaft C24 to rotate, thereby driving the flower-shaped disc 25 to rotate.

[0029] The fixed cylinder 26 is fixedly mounted on the upper surface of the fixed base 1. A movable piston 27 is slidably connected in the inner cavity of the fixed cylinder 26. One end of a push rod 28 is fixedly connected to the upper surface of the movable piston 27. The other end of the push rod 28 passes through the upper wall of the inner cavity of the fixed cylinder 26 and extends to the outside of the wall. A first connecting plate 29 is fixedly connected to the top end of the push rod 28. A contact wheel 30 is rotatably connected to the upper surface of the first connecting plate 29. The outer surface of the contact wheel 30 contacts the side of the flower-shaped disc 25. A sliding rod 34 is fixedly connected to the bottom surface of the first connecting plate 29. The sliding rod 34 slides with the support sleeve 33. The bottom end of the support sleeve 33 is fixedly connected to the upper surface of the fixed base 1. One end of a return spring 35 is fixedly connected to the bottom end of the sliding rod 34. The other end of the return spring 35 is fixedly connected to the bottom wall of the inner cavity of the support sleeve 33. The receiving plate 36 is disposed in the inner cavity of the fixed chamber 7 and positioned below the test block 3. A connecting pipe 38 connects the receiving plate 36 and the storage chamber 37. One end of an air inlet pipe 32 is fixedly connected to the inner cavity of the storage chamber 37, and the other end of the air inlet pipe 32 extends into the inner cavity of the fixed cylinder 26 and is fixedly connected to the fixed cylinder 26. A one-way valve is provided on the air inlet pipe 32. An air outlet pipe 31 is fixedly connected to the inner cavity of the fixed cylinder 26, and a one-way valve is installed on the air outlet pipe 31. When the fracturing fluid injection unit 5 injects fracturing fluid into the test block 3, the fracturing fluid can be delivered and injected through the fracturing fluid injection pipe 12. The movement of the fracturing fluid pushes the second connecting plate 17 to rotate, thereby driving the rotating shaft A15 to rotate, which in turn drives the rotating shaft B18 to rotate, which in turn drives the rotating shaft C24 to rotate, which in turn drives the flower-shaped disc 2. 5. Rotation of the flower-shaped disc 25 causes the protruding part of the flower-shaped disc 25 to press down on the contact wheel 30. The pressing down of the contact wheel 30 can drive the first connecting plate 29 to press down. As the flower-shaped disc 25 continues to rotate, the elastic action of the return spring 35 can push the sliding rod 34 to move upward, thereby driving the first connecting plate 29 to move upward. As the flower-shaped disc 25 continues to rotate, it can drive the first connecting plate 29 to move up and down. The up and down reciprocating motion of the first connecting plate 29 drives the moving piston 27 to move up and down in the inner cavity of the fixed cylinder 26. When the moving piston 27 moves upward in the inner cavity of the fixed cylinder 26, it can draw gas from the inner cavity of the storage chamber 37 through the air inlet pipe 32, and then draw it through the connecting pipe 38. When the first connecting plate 29 moves downward in the inner cavity of the fixed cylinder 26, it can discharge gas through the air outlet pipe 31. By moving the piston 27 up and down in a reciprocating motion, intermittent suction can be achieved through the connecting pipe 38. This allows for the rapid collection of leaked fracturing fluid flowing down to the receiving plate 36 and into the inner cavity of the storage chamber 37 when fracturing fluid leaks out. This enables the rapid recovery and collection of leaked fracturing fluid, thus preventing contamination from leaked fracturing fluid. The advantages of this application are: 1. This application has a reasonable structure and is easy to use. This application pressurizes the test block through a pressurization simulation unit and injects fracturing fluid through a fracturing fluid injection unit to realize fracturing simulation experiments. At the same time, this application can effectively control the injection speed of fracturing fluid through the fracturing fluid injection unit, thereby effectively avoiding the problem of fracturing leakage caused by the test block being pressurized and broken due to excessive fracturing fluid input. It can also avoid the problem of large-scale leakage caused by sudden rapid output of fracturing fluid when the test block breaks. 2. This application has a leakage recovery unit, which can automatically absorb and recover leaked fracturing fluid during the fracturing fluid input experiment, thereby effectively avoiding pollution caused by fracturing fluid leakage and achieving better safety. It solves the problem in the prior art that ordinary fracturing simulation devices are difficult to quickly handle and recover fracturing fluid after leakage, and is suitable for widespread use.

[0030] The circuits, electronic components, and modules involved are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The content protected by this application does not involve any improvement to the software and methods.

[0031] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A true triaxial fracturing simulation test device with fracturing fluid recovery function, characterized in that: The true triaxial fracturing simulation test device with fracturing fluid recovery function includes: A pressure simulation unit (2) for pressurizing the test block (3) is fixedly installed on the upper surface of the fixed base (1); A fracturing fluid injection unit (5) for fracturing fluid injection is fixedly installed on the upper surface of a fixed base (1). The fracturing fluid injection unit (5) can control the fracturing fluid from being injected too quickly. A leakage recovery unit (6) for recovering leaked fracturing fluid is installed on the pressurization simulation unit (2) and the fixed base (1). The leakage recovery unit (6) absorbs and recovers the leaked fracturing fluid. The fracturing fluid injection unit (5) includes an injection pump (11), a fracturing fluid injection pipe (12), a circular fixed shell A (13) and a circular fixed shell B (14). The injection pump (11) is fixedly installed on the upper surface of the fixed base (1). One end of the fracturing fluid injection pipe (12) is connected to the injection pump (11), and the other end of the fracturing fluid injection pipe (12) is connected to the test block (3). A circular fixed shell A (13) is connected to the fracturing fluid injection pipe (12). The inner cavity of the circular fixed shell A (13) is connected to the inner cavity of the fracturing fluid injection pipe (12). A rotating shaft A (15) is rotatably connected in the inner cavity of the circular fixed shell A (13). A fixed sleeve (16) is fixedly connected to the arc-shaped wall of the rotating shaft A (15). A second connecting plate (17) is fixedly installed on the arc-shaped wall of the fixed sleeve (16). Several second connecting plates (17) are provided. Several second connecting plates (17) are fixedly installed at equal intervals on the arc-shaped wall of the fixed sleeve (16). A circular fixed shell A (13) is fixedly connected to a circular fixed shell B (14) on its side wall. A rotating shaft B (18) is rotatably connected to the inner cavity side wall of the circular fixed shell B (14). One end of the rotating shaft B (18) is fixedly connected to one end of the rotating shaft A (15). Fixed sleeve rods (19) are fixedly connected to both sides of the arc-shaped wall of the rotating shaft B (18). A moving rod (20) is slidably connected in the inner cavity of the fixed sleeve rod (19). A connecting ball (21) is fixedly connected to one end of the moving rod (20). A connecting spring (22) is fixedly connected to the other end of the moving rod (20). The other end of the connecting spring (22) is fixedly connected to the inner cavity side wall of the fixed sleeve rod (19). A friction rubber sheet (23) is fixedly connected to the arc-shaped inner wall of the circular fixed shell B (14).

2. The true triaxial fracturing simulation test device with fracturing fluid recovery function according to claim 1, characterized in that: The pressurization simulation unit (2) includes a fixed chamber (7), a pressurization cylinder (8), a pressurization plate (9), and a pressurization fixing plate (10). The fixed chamber (7) is fixedly installed on the upper surface of the fixed base (1). The pressurization fixing plate (10) is fixedly installed in the inner cavity of the fixed chamber (7). There are three pressurization fixing plates (10). The three pressurization fixing plates (10) are respectively fixedly installed on the bottom side of the inner wall and the side walls of the fixed chamber (7). The pressurization cylinder (8) is installed on the fixed chamber (7). There are three pressurization cylinders (8). The three pressurization cylinders (8) are respectively fixedly installed on the upper wall and the side walls of the fixed chamber (7). A pressurization plate (9) is fixedly installed at one end of each of the three pressurization cylinders (8). The three pressurization plates (9) correspond to the three pressurization fixing plates (10).

3. The true triaxial fracturing simulation test device with fracturing fluid recovery function according to claim 1, characterized in that: The test block (3) is provided with an optical fiber sensing cable (4), and the optical fiber sensing cable (4) is connected to an optical fiber monitoring device.

4. The true triaxial fracturing simulation test device with fracturing fluid recovery function according to claim 1, characterized in that: The leakage recovery unit (6) includes a rotating shaft C (24), a flower-shaped disc (25), a fixed cylinder (26), a first connecting plate (29), a contact wheel (30), a receiving disc (36), and a storage bin (37). The rotating shaft C (24) is fixedly installed at the center of the flower-shaped disc (25), and one end of the rotating shaft C (24) is fixedly connected to one end of the rotating shaft B (18).

5. The true triaxial fracturing simulation test device with fracturing fluid recovery function according to claim 4, characterized in that: The fixed cylinder (26) is fixedly installed on the upper surface of the fixed base (1). A movable piston (27) is slidably connected in the inner cavity of the fixed cylinder (26). One end of a push rod (28) is fixedly connected to the upper surface of the movable piston (27). The other end of the push rod (28) passes through the upper wall of the inner cavity of the fixed cylinder (26) and extends to the outside of the wall. A first connecting plate (29) is fixedly connected to the top end of the push rod (28). A contact wheel (30) is rotatably connected to the upper surface of the first connecting plate (29). The outer surface of the contact wheel (30) contacts the side of the flower-shaped disc (25). A sliding rod (34) is fixedly connected to the bottom surface of the first connecting plate (29). The sliding rod (34) slides with the support sleeve rod (33). The bottom end of the support sleeve rod (33) is fixedly connected to the upper surface of the fixed base (1). One end of a return spring (35) is fixedly connected to the bottom end of the sliding rod (34). The other end of the return spring (35) is fixedly connected to the bottom wall of the inner cavity of the support sleeve rod (33).

6. The true triaxial fracturing simulation test device with fracturing fluid recovery function according to claim 5, characterized in that: The receiving plate (36) is located in the inner cavity of the fixed chamber (7) and below the test block (3). A connecting pipe (38) connects the receiving plate (36) and the storage chamber (37). One end of the air inlet pipe (32) is fixedly connected in the inner cavity of the storage chamber (37). The other end of the air inlet pipe (32) extends into the inner cavity of the fixed cylinder (26) and is fixedly connected to the fixed cylinder (26). A one-way valve is provided on the air inlet pipe (32). An air outlet pipe (31) is fixedly connected in the inner cavity of the fixed cylinder (26). A one-way valve is installed on the air outlet pipe (31).

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