High-temperature, high-pressure and high-frequency impact rock breaking test device

Abstract

The invention discloses a high-temperature, high-pressure and high-frequency impact rock breaking test device, and belongs to the technical field of petroleum geology experimental equipment. According to the technical scheme, the device comprises a bit pressure loading mechanism, an impact mechanism, a rotating mechanism, a reaction kettle, a heating furnace and a rock core ejection mechanism, wherein the bit pressure loading mechanism comprises a bit pressure loading plate, a drill rod, a drill rod sealing cavity, a drill rod sealing cavity supporting plate and a feeding hydraulic cylinder; the impact mechanism comprises an actuator, an electromagnetic linear motor and a vibration hydraulic cylinder; the rotating mechanism is connected with the drill rod; the reaction kettle is arranged at the lower end of the bit pressure loading mechanism; the heating furnace wraps the outer side of the reaction kettle barrel; and the rock core ejection mechanism is arranged at the lower end of the reaction kettle. According to the high-temperature, high-pressure and high-frequency impact rock breaking test device, high-frequency impact is coupled with high temperature and high pressure, the rock breaking process can be better and truly simulated, and the device is good in sealing performance.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of petroleum geology experimental equipment, and particularly relates to a high-temperature high-pressure and high-frequency impact rock breaking test device. BACKGROUND

[0002] Rock drillability refers to the difficulty of rock being broken by a rock breaking tool under certain technical conditions. Difficult-to-drill formations are one of the main technical bottlenecks restricting efficient exploration and development of oil and gas resources, because the service life of a drill bit is short and the drilling speed is slow. The key problem is that, under the deep complex high-temperature high-pressure environment, the damage behavior of rock after being subjected to impact load is very complex, which is closely related to the microstructure of rock.

[0003] Research on the impact rock breaking mechanism of rock in the high-temperature high-pressure downhole real environment is conducive to guiding the optimization of the drill bit structure and drilling parameters. However, the traditional rock mechanics experimental device is difficult to simultaneously simulate the high-temperature (>200℃) and high ground stress (>100MPa) composite environment of deep formations. Meanwhile, the traditional rock breaking equipment is complicated to operate and poor in sealing. Therefore, it is particularly important to provide a high-temperature high-pressure and high-frequency impact rock breaking test device. SUMMARY

[0004] The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the application will be apparent from the description and drawings.

[0005] The application provides a high-temperature high-pressure and high-frequency impact rock breaking test device, which couples high-frequency impact with high-temperature high-pressure, can better simulate the rock breaking process, and is good in sealing.

[0006] The application provides a high-temperature high-pressure and high-frequency impact rock breaking test device, which includes: A drilling pressure loading mechanism, including a drilling pressure loading plate, a drill rod, a drill rod sealing cavity, a drill rod sealing cavity support plate and a feeding hydraulic cylinder; one end of the feeding hydraulic cylinder is connected with the drilling pressure loading plate; the drill rod sealing cavity is fixed on the drill rod sealing cavity support plate, and the drill rod sealing cavity support plate is fixed on the drilling pressure loading plate through a drill rod sealing cavity support column; the drill rod is arranged in the drill rod sealing cavity; An impact mechanism, including an actuator, an electromagnetic linear motor and a vibration hydraulic cylinder; the actuator is arranged at the upper end of the drilling pressure loading mechanism and connected with the electromagnetic linear motor and the vibration hydraulic cylinder respectively, and the actuator is coaxially arranged with the drill rod; A rotating mechanism, connected with the drill rod, for controlling the rotating speed and torque of the drill rod; A reaction kettle, arranged at the lower end of the drilling pressure loading mechanism; A heating furnace, wrapped outside the reaction kettle barrel; A rock core ejection mechanism, arranged at the lower end of the reaction kettle, for lifting the rock sample in the reaction kettle.

[0007] In some embodiments, the system further includes: a floating upper plate, a floating lower plate, and a reactor conversion connector; the floating upper plate is provided with a hydraulic locking device, the floating upper plate is fixedly connected to the floating lower plate via a floating lower plate support column, and the other end of the feed hydraulic cylinder is fixed to the floating upper plate; the upper end of the reactor conversion connector is fixed to the floating lower plate, and the lower end is fixed to the reactor via a clamp.

[0008] In some embodiments, the system further includes: a reactor support plate, a reactor support column, and a base plate, wherein the reactor is fixed on the reactor support plate, and the reactor support plate is fixed on the base plate by the reactor support column.

[0009] In some embodiments, the device further includes an actuator support plate and an actuator support column, wherein the actuator is fixedly connected to the actuator support plate, and the actuator support plate is fixedly connected to the drill pressure loading plate via the actuator support column.

[0010] In some embodiments, the system further includes: a guide post and an upper plate, one end of the guide post being connected to the reactor support plate and the other end being connected to the upper plate; the upper plate has an opening in the middle, through which the actuator cylinder can freely enter and exit.

[0011] In some embodiments, it further includes: a lifting hydraulic cylinder, one end of which is connected to the base plate and the other end of which is connected to the upper plate of the floating plate.

[0012] In some embodiments, the rotating mechanism includes: a motor, a synchronous belt, a small synchronous pulley, and a large synchronous pulley; One end of the motor is fixed to the drill pressure loading plate by a motor mounting bracket, and the other end is connected to the small synchronous pulley. The groove on the large synchronous pulley is connected to the spline on the drill rod. The large synchronous pulley is connected to the small synchronous pulley by a synchronous belt.

[0013] In some embodiments, the reaction vessel includes: The cylinder has an axially penetrating cavity and radially penetrating pores. A rubber tube, located inside the cavity of the cylinder and having an axially penetrating cavity, is used to transfer confining pressure to the rock sample; The rock sample lifting and lowering plug is located at the bottom of the rubber tube and is compatible with the inner diameter of the rubber tube, allowing it to move up and down inside the rubber tube. The lower plug is located at the lower end of the rock sample lifting plug, and the lower plug has an axially penetrating hole. The lower pressure cap is threaded to the lower end of the cylinder, and an axially penetrating hole is provided on the lower pressure cap.

[0014] In some embodiments, dynamic seals are provided at the upper and lower ends of the drill pipe sealing cavity, and a drilling fluid inlet for the drill pipe sealing cavity is provided between the two dynamic seals.

[0015] In some embodiments, an upper pressure cap for the drill pipe sealing cavity is provided on the upper part of the dynamic seal at the upper end of the drill pipe sealing cavity, and a lower pressure cap for the drill pipe sealing cavity is provided on the lower part of the dynamic seal at the lower end of the drill pipe sealing cavity.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The high-temperature, high-pressure, and high-frequency impact rock-breaking test device provided by this invention, through an electromagnetic-hydraulic composite drive actuator, breaks through the frequency limitation of traditional SHPB (Hopkinson rod), reaching up to 200Hz. Simultaneously, it enables precise high-frequency control during the impact rock-breaking experiment. Furthermore, by setting up a reaction vessel, high-frequency impact is coupled with high temperature and high pressure, allowing for a more realistic simulation of the rock-breaking process. The dynamic impact (frequency > 100Hz) composite environment allows for the study of the interaction, mechanism, drilling effect, and drilling fluid evaluation of various factors during the drilling process, thereby enabling evaluation work in multiple aspects such as drill bit selection, drilling parameter optimization, and drilling fluid evaluation. 2. By setting up a floating plate upper plate, a floating plate lower plate support column, a floating plate lower plate, an actuator support plate, an actuator support column, a drill rod sealing cavity support plate, a drill rod sealing cavity support column, and a guide column, a four-column structure is formed. This not only makes the entire device more stable, but also allows the device to be quickly and easily disassembled and the rock sample to be replaced, greatly improving the efficiency of the experiment. 3. The actuator of the impact mechanism and the drill rod of the drilling pressure loading mechanism are set coaxially to form a dynamic-static load coaxial integrated design, and are integrated into a four-column mechanism to avoid the problem of data separation of multiple devices and directly correlate the mechanical response of rock samples under composite loads; 4. A combination structure of two dynamic seals and dynamic sealing gaskets is adopted to ensure the sealing reliability of the high-pressure cavity under high-frequency vibration. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the impact rock-breaking test device provided by the present invention; Figure 2 This is a schematic diagram of the left side structure of the impact rock-breaking test device provided by the present invention; Figure 3 This is a schematic diagram of the impact mechanism of the impact rock-breaking test device provided by the present invention; Figure 4 A schematic diagram of the four-column structure of the impact rock-breaking test device provided by the present invention; Figure 5This is a schematic diagram of the structure of the reaction vessel and drill pipe sealing cavity provided by the present invention; Figure 6 This is a schematic diagram of the overall structure of the reaction vessel provided by the present invention; Figure 7 This is a schematic diagram of the rotating mechanism provided by the present invention; Figure 8 This is a schematic diagram of the structure of the upper plate provided by the present invention; Figure 9 This is a schematic diagram of the drill pipe and micro drill bit assembly provided by the present invention; Wherein: 1-Drill pressure loading plate, 2-Drill rod, 3-Drill rod sealing cavity, 4-Drill rod sealing cavity support plate, 5-Feed hydraulic cylinder, 6-Drill rod sealing cavity support column, 7-Actuator, 8-Electromagnetic linear motor, 9-Vibration hydraulic cylinder, 10-Reaction vessel, 11-Heating furnace, 12-Core ejection mechanism, 13-Floating plate upper plate, 14-Floating plate lower plate, 15-Reaction vessel conversion joint, 16-Hydraulic locking device, 17-Floating plate lower plate support column, 18-Clamp, 19-Dynamic seal, 20-Dynamic seal gasket ring, 21-Reaction vessel support plate, 22-Reaction vessel support column, 2 3-Base plate, 24-Actuator support plate, 25-Actuator support column, 26-Guide column, 27-Upper plate, 28-Lifting hydraulic cylinder, 29-Motor, 30-Synchronous belt, 31-Small synchronous pulley, 32-Large synchronous pulley, 33-Cylinder, 34-Pore, 35-Rubber sleeve, 36-Rock sample lifting and lowering plug, 37-Lower plug, 38-Lower pressure cap, 39-Drilling fluid inlet, 40-Drill pipe sealing cavity upper pressure cap, 41-Drill pipe sealing cavity lower pressure cap, 42-Load sensor, 43-Spline, 44-Drilling fluid inlet, 45-Drilling fluid outlet, 46-Micro drill bit. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. All other embodiments obtained by those skilled in the art based on the embodiments provided by this invention without inventive effort are within the scope of protection of this invention.

[0019] Obviously, the accompanying drawings described below are merely some examples or embodiments of the present invention. Those skilled in the art can apply the present invention to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this invention, modifications to design, manufacturing, or production based on the technical content disclosed in this invention are merely conventional technical means and should not be construed as insufficient disclosure of the present invention.

[0020] In this invention, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this invention may be combined with other embodiments without conflict.

[0021] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "a," "an," "an," "the," and similar words used in this invention do not indicate quantity limitation and may indicate singular or plural. The terms "comprising," "including," "having," and any variations thereof used in this invention are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units not listed, or may include other steps or units inherent to these processes, methods, products, or devices. The terms "connected," "linked," "coupled," and similar words used in this invention are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "A plurality" used in this invention refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships may exist; for example, "A and / or B" can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following objects have an "or" relationship. The terms "first," "second," and "third" used in this invention are merely to distinguish similar objects and do not represent a specific ordering of the objects.

[0022] like Figures 1-3 As shown, the present invention provides a high-temperature, high-pressure, and high-frequency impact rock-breaking test device, comprising: The drill pressure loading mechanism includes a drill pressure loading plate 1, a drill rod 2, a drill rod sealing cavity 3, a drill rod sealing cavity support plate 4, and a feed hydraulic cylinder 5; one end of the feed hydraulic cylinder 5 is connected to the drill pressure loading plate 1; the drill rod sealing cavity 3 is fixed on the drill rod sealing cavity support plate 4, and the drill rod sealing cavity support plate 4 is fixed on the drill pressure loading plate 1 by a drill rod sealing cavity support column 6; the drill rod 2 is disposed inside the drill rod sealing cavity 3; The impact mechanism includes an actuator 7, an electromagnetic linear motor 8, and a vibratory hydraulic cylinder 9; the actuator 7 is located at the upper end of the drilling pressure loading mechanism and is connected to the electromagnetic linear motor 8 and the vibratory hydraulic cylinder 9 respectively, and the actuator 7 is coaxially arranged with the drill rod 2. A rotating mechanism, connected to drill rod 2, is used to control the rotational speed and torque of drill rod 2; The reaction vessel 10 is located at the lower end of the drilling and loading mechanism; Heating furnace 11 is wrapped around the outside of the reactor vessel 10 cylinder; The core ejection mechanism 12 is located at the lower end of the reactor 10 and is used to lift and lower the rock sample inside the reactor 10.

[0023] This invention provides a high-temperature, high-pressure, and high-frequency impact rock-breaking test device, including a drilling pressure loading mechanism. Specifically, the feed hydraulic cylinder 5 applies drilling pressure to the drilling pressure loading plate 1, which is then transmitted to the drill rod 2 to complete the drilling pressure loading on the drill rod 2 and realize the drilling process of the drill rod 2.

[0024] This invention provides a high-temperature, high-pressure, and high-frequency impact rock-breaking test device, including an impact mechanism. Specifically, by connecting an actuator 7 to an electromagnetic linear motor 8 and a vibrating hydraulic cylinder 9, the actuator 7 can be adjusted to impact the drill rod 2 through its movement. In this invention, the electromagnetic linear motor 8 and the vibrating hydraulic cylinder 9 are used to drive the actuator 7 via an electromagnetic-hydraulic composite mechanism, enabling the actuator 7 to have a higher frequency, breaking through the frequency limitation of the traditional SHPB (Hopkinson bar), reaching up to 200Hz. Simultaneously, it achieves high-frequency precise control during the impact rock-breaking experiment, better simulating the rock-breaking process. In this invention, during drilling, the micro-drill bit 46 connected to the drill rod 2 is impacted by the actuator 7. The impact frequency is adjustable from 5 to 200Hz, the impact amplitude is adjustable from ±15mm, the impact speed is adjustable from 0 to 3mm / s, and the maximum impact force reaches 5KN. This invention does not have a specific limitation on the source of the electromagnetic linear motor 8; any commercially available product in the field is acceptable. A schematic diagram of the combination of the drill rod and the micro-drill bit is shown below. Figure 9 As shown. This invention does not impose any special limitations on the specific structure of the micro-drill bit 46; any commercially available product in the field can be used. In this embodiment, a PDC drill bit is used.

[0025] During operation, the rock sample is placed in the reactor 10 through the core ejection mechanism 12. The reactor 10 is then connected to the impact mechanism. The heating furnace 11 is turned on to heat the rock sample in the reactor 10. Once the temperature meets the experimental requirements, it is maintained. Subsequently, axial pressure loading, confining pressure loading, and in-situ stress loading are applied to the rock sample in the reactor 10. After the temperature and pressure meet the experimental requirements, the vertical position of the drill rod 2 is adjusted. Once the position of the drill rod 2 is adjusted, the feed hydraulic cylinder 5 applies drilling pressure to the drill rod 2 through the drilling pressure loading plate 1. The rotation mechanism is then activated to drive the drill rod 2 and the micro-drill bit 46 to output torque and speed. After the micro-drill bit 46 contacts the rock sample and reaches the preset pressure, the torque and speed are adjusted to the preset torque and speed to begin the drillability test.

[0026] In this invention, further, such as Figure 4 As shown, it also includes: a floating upper plate 13, a floating lower plate 14, and a reactor conversion connector 15; the floating upper plate 13 is equipped with a hydraulic locking device 16, and the floating upper plate 13 is fixedly connected to the floating lower plate 14 through a floating lower plate support column 17, and the other end of the feed hydraulic cylinder 5 is fixed to the floating upper plate 13; the upper end of the reactor conversion connector 15 is fixed to the floating lower plate 14, and the lower end is fixed to the reactor 10 through a clamp 18. The present invention does not have a special limitation on the specific structure of the hydraulic locking device 16, and conventional commercially available products in the art can be used.

[0027] In this invention, further, such as Figure 5 As shown, two sets of dynamic seals 19 are provided in the cavity on the upper surface of the reactor conversion joint 15, and a dynamic sealing gasket 20 is provided between the two sets of dynamic seals 19. The dynamic seals 19 are used to maintain the pressure of the drilling fluid injected into the cleaning micro-drill bit 46 from the drilling fluid inlet 44 on the drill pipe 2; separating the two sets of dynamic seals with the dynamic sealing gasket 20 further improves the sealing effect. Furthermore, in this invention, the drilling fluid injected into the cleaning micro-drill bit 46 is discharged from the drilling fluid outlet 45 provided on the reactor conversion joint 15.

[0028] In this invention, further, such as Figure 1 As shown, it also includes: a reactor support plate 21, a reactor support column 22 and a base plate 23. The reactor 10 is fixed on the reactor support plate 21, and the reactor support plate 21 is fixed on the base plate 23 by the reactor support column 22.

[0029] In this invention, further, such as Figure 1 As shown, it also includes: an actuator support plate 24 and an actuator support column 25. The actuator 7 is fixedly connected to the actuator support plate 24, and the actuator support plate 24 is fixedly connected to the drill pressure loading plate 1 through the actuator support column 25.

[0030] In this invention, further, such asFigure 1 and 8 As shown, it also includes: a guide post 26 and an upper plate 27. One end of the guide post 26 is connected to the reactor support plate 21, and the other end is connected to the upper plate 27. The upper plate 27 has an opening in the middle, through which the actuator cylinder of the actuator 7 can freely enter and exit. In this invention, the guide post 26 provides vertical linear motion constraints for the floating upper plate 13, the drilling and loading plate 1, and the floating lower plate 14 in the four-column mechanism, preventing lateral deviation and ensuring the motion trajectory.

[0031] In this invention, a four-column structure is formed by setting up a floating plate upper plate 13, a floating plate lower plate support column 17, a floating plate lower plate 14, a reactor support plate 21, a reactor support column 22, a bottom plate 23, an actuator support plate 24, an actuator support column 25, a drill rod sealing cavity support plate 4, a drill rod sealing cavity support column 6, and a guide column 26. The four-column structure formed in this invention has the following advantages: 1. A hydraulic locking device 16 is provided on the upper plate 13 of the floating plate, which has a hydraulic locking function and is safe and reliable; 2. The upper plate 13 of the floating plate, the drilling load plate 1, and the lower plate 14 of the floating plate can all move up and down through the guide column 26 (specifically, the up and down movement of the lifting hydraulic cylinder drives the upper plate 13 and the lower plate 14 of the floating plate to move up and down through the guide column 26, and at the same time, the drilling load plate 1 will also move up and down; after the upper plate 13 and the lower plate 14 of the floating plate are hydraulically locked, the feed hydraulic cylinder 5 moves up and down, which drives the drilling load plate 1 to move up and down through the guide column 26; in addition, the lifting hydraulic cylinder and the feed hydraulic cylinder 5 can coordinate to control the up and down movement of the upper plate 13, the lower plate 14 of the floating plate, and the drilling load plate 1), making the design flexible and adaptable to expansions of different sizes or functions; 3. The four-column design can reduce the deformation of the worktable or crossbeam and has high rigidity; 4. In high-speed motion or high-frequency vibration environments, the four columns can effectively suppress vibration, maintain structural stability, and have good dynamic performance; 5. This makes the entire device more stable on the one hand, and allows the device to be disassembled quickly and easily, as well as the rock samples to be replaced on the other hand.

[0032] In this invention, further, such as Figure 1 As shown, it also includes a lifting hydraulic cylinder 28, one end of which is connected to the base plate 23, and the other end of which is connected to the upper plate 13 of the floating plate. In this invention, by setting the lifting hydraulic cylinder 28, the upper plate 13 of the floating plate can be raised and lowered, thereby adjusting the raising and lowering of the drill rod 2.

[0033] In this invention, further, such as Figure 7As shown, the rotating mechanism includes: a motor 29, a synchronous belt 30, a small synchronous pulley 31, and a large synchronous pulley 32; one end of the motor 29 is fixed to the drill pressure loading plate 1 through a motor mounting bracket, and the other end is connected to the small synchronous pulley 31. The groove on the large synchronous pulley 32 is connected to the spline 43 on the drill rod. In addition, the large synchronous pulley 32 is connected to the small synchronous pulley 31 through the synchronous belt 30.

[0034] In this invention, further, such as Figure 5 and 6 As shown, the reactor 10 includes: a cylindrical body 33 having an axially penetrating cavity, and a radially penetrating orifice 34 provided on the cylindrical body 33; a rubber sleeve 35 disposed in the cavity of the cylindrical body 33, and having an axially penetrating cavity, for transferring confining pressure to the rock sample; a rock sample lifting and lowering plug 36 disposed at the bottom of the rubber sleeve 35 and adapted to the inner diameter of the rubber sleeve 35, and movable up and down within the rubber sleeve 35; a lower plug 37 disposed at the lower end of the rock sample lifting and lowering plug 36, and having an axially penetrating orifice 34 provided on the lower plug 37; and a lower pressure cap 38 threadedly connected to the lower end of the cylindrical body 33, and having an axially penetrating orifice 34 provided on the lower pressure cap 38. Specifically, the cylinder 33 has an axially through cavity, allowing the rubber sleeve 35 to be placed inside the cavity. The rock sample lifting and lowering plug 36 is located at the bottom of the rubber sleeve 35, and its outer diameter matches the inner diameter of the rubber sleeve 35. Together with the rubber sleeve 35, they form the rock sample chamber. The height of the rock sample chamber is adjusted by its up-and-down movement within the rubber sleeve 35. High-pressure liquid is injected into the outside of the rubber sleeve 35 inside the cylinder 33 through the holes 34 on the cylinder 33, thereby obtaining the set confining pressure of the rock sample. High-pressure liquid is injected into the lower pressure cap 38 through the holes 34 on the lower pressure cap 38, thereby obtaining the set axial pressure of the rock sample. High-pressure liquid is injected into the lower plug 37 through the holes 34 on the lower plug 37, thereby obtaining the set geostress of the rock sample, providing a high-pressure, high-temperature simulation environment for the rock sample. The core ejection mechanism 12 passes through the lower pressure cap 38 and connects to the rock sample lifting and lowering plug 36, used to control the raising and lowering of the rock sample lifting and lowering plug 36. In this invention, a constant flow and constant pressure pump is used to inject high-pressure liquid. Furthermore, a temperature sensor is installed inside the rubber sleeve 35 to provide real-time temperature feedback of the rock sample. This invention does not impose any special limitations on the specific structure and connection method of the cross-flow constant pressure pump and temperature sensor; conventional commercially available products in the field can be used.

[0035] In this invention, further, such as Figure 5As shown, dynamic seals 19 are provided at both the upper and lower ends of the drill pipe sealing cavity 3, and a drilling fluid inlet 39 for the drill pipe sealing cavity is provided between the two dynamic seals 19. Specifically, drilling fluid is injected into the drill pipe sealing cavity 3 through the drilling fluid inlet 39. The dynamic seal 19 structure seals the pressurized drilling fluid, so that the drilling fluid can only flow down along the hole of the drill pipe 2, onto the micro drill bit 46, and finally flow out from the drilling fluid outlet 45 provided on the reactor conversion joint 15, thereby carrying away rock cuttings.

[0036] In some embodiments, an upper pressure cap 40 for the drill pipe sealing cavity is provided above the dynamic seal 19 at the upper end of the drill pipe sealing cavity 3, and a lower pressure cap 41 for the drill pipe sealing cavity is provided below the dynamic seal 19 at the lower end of the drill pipe sealing cavity 3. By providing the upper pressure cap 40 and the lower pressure cap 41 for the drill pipe sealing cavity, the sealing performance can be further improved.

[0037] In this invention, the heating range of the heating furnace 11 is adjustable from 0 to 300°C. Furthermore, the heating furnace is equipped with a temperature controller. This invention does not impose any special limitations on the specific structure and connection method of the temperature controller; conventional methods in the art can be used.

[0038] In this invention, further, such as Figure 3 As shown, the high-temperature, high-pressure, and high-frequency impact rock-breaking test device further includes a load sensor 42, which is threadedly connected to the impact end of the actuator 7. In this invention, the load sensor 42 is provided to measure the impact force of the actuator 7.

[0039] Furthermore, this invention includes a displacement sensor for measuring the drilling depth of the micro-drill bit 46. More specifically, a wire-type displacement sensor is used. One end of the wire-type displacement sensor is fixed to the lower plate 14 of the floating plate, and the other end is fixed to the drill pressure loading plate 1. The lower plate 14 and the adapter are fixed. The drill pressure loading plate 1 and the micro-drill bit 46 move downwards together. Therefore, the downward distance of the drill pressure loading plate 1 is the drilling depth of the micro-drill bit 46, and the drilling depth is indirectly measured using the wire-type displacement sensor.

[0040] In this invention, the high-temperature, high-pressure, and high-frequency impact rock-breaking test device further includes a data acquisition and control system, which is connected to the impact mechanism, the drilling pressure loading mechanism, the rotating mechanism, the heating furnace, the core ejection mechanism, the temperature sensor, the displacement sensor, and the constant current and constant pressure pump. This invention does not impose any special limitations on the specific connection methods between the data acquisition and control system and the individual devices such as the impact mechanism, the drilling pressure loading mechanism, the rotating mechanism, the heating furnace, and the core ejection mechanism; conventional network and electrical connection methods in the art are sufficient.

[0041] To further illustrate the present invention, the technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0042] Example 1 1. The upper plate of the floating plate is lifted by a lifting hydraulic cylinder, thereby causing the lower plate of the floating plate to rise and fall. The reactor conversion joint connected to the lower plate is pulled up. After the reactor conversion joint is pulled up to a certain height, the upper plate of the floating plate is hydraulically locked, that is, the positions of the upper plate, the lower plate of the floating plate, and the reactor conversion joint remain fixed. 2. A granite sample (Φ190.5mm×250mm) is selected and placed into the reactor using a core ejection mechanism. 3. The upper plate of the floating plate is lowered by a lifting hydraulic cylinder, thereby adjusting the lower plate of the floating plate to lower the reactor conversion joint. After the reactor conversion joint is lowered to be completely in contact with the reactor, the upper plate of the floating plate is hydraulically locked, that is, the positions of the upper plate, the lower plate of the floating plate, and the reactor conversion joint remain fixed. 4. Secure the reactor adapter and reactor with clamps; 5. Place the heating furnace around the reactor and heat the rock sample inside to 300℃; 6. After the rock sample reaches 300℃, use a constant flow and constant pressure pump to apply axial pressure, confining pressure, and ground stress to the rock sample inside the reactor to 150MPa; 7. Once the axial pressure, confining pressure, and ground stress applied to the rock sample meet the requirements, adjust the drilling pressure loading plate up and down to position the drill rod appropriately; 8. The feed hydraulic cylinder applies pressure to the drill rod and PDC drill bit to 30KN through the drilling pressure loading plate. Simultaneously, start the motor, transmitting speed and torque to the drill rod and PDC drill bit through the large and small synchronous pulleys and synchronous belt, outputting a torque of 100 N / m and a speed of 100 rpm. 9. After the drill pressure loading plate, carrying the drill rod and PDC drill bit, falls to contact the PDC drill bit and rock sample and reaches the preset drill pressure of 30KN, adjust the motor output speed to make the torque of the drill rod and PDC drill bit reach 200 N / m and the speed reach 200 rpm; 10. Start drilling, and simultaneously measure the drilling depth of the PDC drill bit through the displacement sensor; 11. During drilling, control the actuator to impact the drill rod at a frequency of 200HZ, an amplitude of 15mm, a speed of 3m / s, and an impact force of 5KN, and then impact the PDC drill bit at the other end of the drill rod. Record the data and view the curve; 12. Control the actuator to impact the drill rod at a frequency of 150HZ, an amplitude of 15mm, a speed of 3m / s, and an impact force of 5KN, and then impact the PDC drill bit at the other end of the drill rod. 13. Control the actuator to impact the drill rod at a frequency of 100Hz, an amplitude of 15mm, a speed of 3m / s, and an impact force of 5KN, and then impact the PDC drill bit at the other end of the drill rod. Record the data and view the curve. 14. After drilling to a depth of 150mm, withdraw the PDC drill bit. 15. Turn off the motor power. 16. Stop heating the furnace. 17. Stop loading the axial pressure, confining pressure, and geostress of the rock sample in the reactor. 18. Remove the clamps and release the locking of the reactor conversion joint and the reactor. 19.The hydraulic lock on the upper floating plate is released, and the lifting hydraulic cylinder slowly lifts the upper and lower floating plates. The reactor conversion joint, fixed to the lower floating plate, is also lifted. After the reactor conversion joint is lifted to a certain height, the upper floating plate is hydraulically locked again, meaning the upper and lower floating plates and the reactor conversion joint remain fixed. 20. The core ejection mechanism ejects the rock sample from the reactor for replacement or to leave it empty. 21. The core ejection mechanism returns to its original position. 22. The experiment ends.

[0043] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A high-temperature, high-pressure, and high-frequency impact rock-breaking test device, characterized in that, include: A drill pressure loading mechanism includes a drill pressure loading plate, a drill rod, a drill rod sealing cavity, a drill rod sealing cavity support plate, and a feed hydraulic cylinder; one end of the feed hydraulic cylinder is connected to the drill pressure loading plate; the drill rod sealing cavity is fixed on the drill rod sealing cavity support plate, and the drill rod sealing cavity support plate is fixed on the drill pressure loading plate by a drill rod sealing cavity support column; the drill rod is disposed inside the drill rod sealing cavity. The impact mechanism includes an actuator, an electromagnetic linear motor, and a vibratory hydraulic cylinder; the actuator is located at the upper end of the drilling pressure loading mechanism and is connected to the electromagnetic linear motor and the vibratory hydraulic cylinder respectively, and the actuator is coaxially arranged with the drill rod. The rotating mechanism, connected to the drill pipe, is used to control the rotational speed and torque of the drill pipe. The reaction vessel is located at the lower end of the drilling and loading mechanism; The heating furnace is wrapped around the outside of the reactor vessel. The core ejection mechanism is located at the lower end of the reactor and is used to lift and lower the rock sample inside the reactor.

2. The impact rock-breaking test device according to claim 1, characterized in that, Also includes: The floating plate consists of an upper plate, a lower plate, and a reactor conversion connector. The upper plate is equipped with a hydraulic locking device, and the upper plate is fixedly connected to the lower plate via a support column. The other end of the feed hydraulic cylinder is fixed to the upper plate. The upper end of the reactor conversion connector is fixed to the lower plate, and the lower end is fixed to the reactor via a clamp.

3. The impact rock-breaking test device according to claim 2, characterized in that, Also includes: The reactor includes a support plate, a support column, and a base plate. The reactor is fixed on the support plate, and the support plate is fixed to the base plate via the support column.

4. The impact rock-breaking test device according to claim 1, characterized in that, Also includes: The actuator support plate and actuator support column are used. The actuator is fixedly connected to the actuator support plate, and the actuator support plate is fixedly connected to the drill pressure loading plate through the actuator support column.

5. The impact rock-breaking test device according to claim 3, characterized in that, Also includes: The guide column and the upper plate are provided. One end of the guide column is connected to the reactor support plate, and the other end is connected to the upper plate. The upper plate has an opening in the middle, and the actuator cylinder can freely enter and exit the opening.

6. The impact rock-breaking test device according to claim 3, characterized in that, Also includes: The lifting hydraulic cylinder is connected to the base plate at one end and to the floating plate at the other end.

7. The impact rock-breaking test device according to claim 1, characterized in that, The rotating mechanism includes: Motor, synchronous belt, small synchronous pulley and large synchronous pulley; One end of the motor is fixed to the drill pressure loading plate by a motor mounting bracket, and the other end is connected to the small synchronous pulley. The groove on the large synchronous pulley is connected to the spline on the drill rod. The large synchronous pulley is connected to the small synchronous pulley by a synchronous belt.

8. The impact rock-breaking test device according to claim 1, characterized in that, The reaction vessel includes: The cylinder has an axially penetrating cavity and radially penetrating pores. A rubber tube, located inside the cavity of the cylinder and having an axially penetrating cavity, is used to transfer confining pressure to the rock sample; The rock sample lifting and lowering plug is located at the bottom of the rubber tube and is compatible with the inner diameter of the rubber tube, allowing it to move up and down inside the rubber tube. The lower plug is located at the lower end of the rock sample lifting plug, and the lower plug has an axially penetrating hole. The lower pressure cap is threaded to the lower end of the cylinder, and an axially penetrating hole is provided on the lower pressure cap.

9. The impact rock-breaking test device according to claim 1, characterized in that, Dynamic seals are provided at the upper and lower ends of the drill pipe sealing cavity, and the drilling fluid inlet of the drill pipe sealing cavity is provided between the two dynamic seals.

10. The impact rock-breaking test device according to claim 9, characterized in that, An upper pressure cap for the drill pipe sealing cavity is provided on the upper part of the dynamic seal at the upper end of the drill pipe sealing cavity, and a lower pressure cap for the drill pipe sealing cavity is provided on the lower part of the dynamic seal at the lower end of the drill pipe sealing cavity.

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