Multifunctional constant-pressure penetration test system and device

Abstract

The invention belongs to the technical field of drilling hydrogeological tests, and particularly relates to a multifunctional constant-pressure penetration test system and device.The multifunctional constant-pressure penetration test system comprises an underground device and a ground test system, and the underground device comprises an extension pipe and a water injection and exhaust assembly; a sensor assembly electrically connected with a ground test system is arranged in the sensor mounting pipe; a test section communicating pipe is arranged between the two embolism pipes in a communicating mode, the embolism pipe located at the top is communicated with the bottom of the sensor mounting pipe and is in shaft connection with the sensor mounting pipe, and the embolism pipe located at the bottom is fixedly connected with a clamping and fixing head; the embolism tube comprises a first tube body and a deformation part arranged on the outer side of the first tube body in a sleeving mode, a sliding groove is formed in the outer side of the first tube body, and the deformation part is arranged on the outer side of the first tube body in a sliding mode through the sliding groove; the clamping head is in transmission connection with a driving part; and the underground valve is fixedly connected in the test section communicating pipe. According to the device, the underground device can be accurately fixed at a designated position of a drill hole through matching of the plug pipe and the clamping head, and the test precision is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of borehole hydrogeological testing, and particularly relates to a multi-functional constant-pressure penetration testing system and device. Background Art

[0002] Borehole hydrogeological testing is an important in-situ testing method for obtaining the permeability parameters of rock masses or rock formations. The water pressure test is a common borehole hydrogeological testing method for low-permeability rock masses or rock formations, and can adopt a steady flow mode or an unsteady flow mode.

[0003] In borehole hydrogeological testing, double-packer borehole hydrogeological testing equipment is often used. However, during the use of the double-packer borehole hydrogeological testing equipment, especially after the equipment is lowered to the designated position in the borehole, when the packers expand, the overall length of the device shortens, which will cause the displacement of the test section and deviation from the expected test area. Therefore, there is an urgent need for a multi-functional constant-pressure penetration testing system and device to solve this problem. Summary of the Invention

[0004] The purpose of the present invention is to provide a multi-functional constant-pressure penetration testing system and device to solve the above problems.

[0005] To achieve the above purpose, the present invention provides the following solutions:

[0006] A multi-functional constant-pressure penetration testing system and device, including a downhole device and a ground test system. The downhole device includes:

[0007] An extension pipe, the top of which is provided with a water injection and exhaust assembly;

[0008] A sensor installation pipe, which is connected and arranged at the bottom of the extension pipe. The sensor installation pipe is axially connected with the extension pipe, and a sensor assembly electrically connected to the ground test system is arranged in the sensor installation pipe;

[0009] Two packer pipes, a test section connecting pipe is connected between the two packer pipes. The packer pipe at the top is connected and axially connected to the bottom of the sensor installation pipe, and a clamping head is fixedly connected to the packer pipe at the bottom. The test section connecting pipe is axially connected with the packer pipe; the packer pipe includes a first pipe body and a deformation part sleeved outside the first pipe body. A sliding groove is opened on the outside of the first pipe body, and the deformation part is slidably arranged on the outside of the first pipe body through the sliding groove;

[0010] The clamping head is drivingly connected with a driving part, and the driving part drives the clamping head to deform and clamp at the bottom of the borehole;

[0011] A downhole valve, which is fixedly connected in the test section connecting pipe, and the downhole valve is used to control the on-off of the test section connecting pipe and the packer pipe at the top.

[0012] Optionally, the deformation part includes:

[0013] Two slip rings are slidably arranged outside the chute. An elastic part is arranged between the two slip rings, and the elastic part is sleeved outside the chute;

[0014] A rubber balloon is fixed to the corresponding slip rings at both ends;

[0015] An electromagnet I is embedded in the first pipe body. The electromagnet I is located in the middle of the chute, and the electromagnet I is magnetically connected to the slip rings;

[0016] The first pipe body is made of insulating material. After the electromagnet I is energized to generate a magnetic field, under the action of the magnetic field, the two slip rings are attracted to the middle of the electromagnet I, so that the elastic part is compressed. After the electromagnet I is powered off and the magnetic field disappears, the elastic part drives the two slip rings to reset.

[0017] Optionally, the elastic part includes a spring, and the spring is sleeved outside the chute.

[0018] Optionally, the test section connecting pipe includes:

[0019] A second pipe body, with both ends fixed to the ends of the corresponding plugging pipes respectively;

[0020] An exhaust hole is opened at the top of the second pipe body;

[0021] A water injection hole is opened at the bottom of the second pipe body.

[0022] Optionally, the clamping head includes:

[0023] A rubber head is fixedly connected to the bottom of the plugging pipe at the bottom through a mounting plate, and the rubber head is in transmission connection with the driving part.

[0024] Optionally, the driving part includes:

[0025] A threaded plate is pivotally connected to the bottom of the mounting plate;

[0026] A threaded column is threadedly connected to the middle of the threaded plate. The bottom end of the threaded column is rotatably connected to the inner wall of the rubber head. The top end of the threaded column penetrates through the mounting plate and extends upward. After passing through the inner cavity formed by the communication of the extension pipe, the sensor mounting pipe, the plugging pipe, and the test section connecting pipe, it passes through the middle of the water injection and exhaust assembly.

[0027] Optionally, the downhole valve includes:

[0028] A valve plate is axially connected to the second pipe body, the valve plate is provided with two symmetrically arranged water-permeable holes, and a threaded column through hole is provided in the middle of the valve plate for the threaded column to pass through;

[0029] A rotor is rotatably mounted on the valve plate, the rotor and the valve plate being coaxially arranged, and baffles for shielding the water permeable holes are symmetrically fixedly connected to both ends of the rotor;

[0030] The rotation driving part is in driving connection with the rotor, and the rotation driving part is arranged on the valve plate.

[0031] Optionally, the rotation drive unit includes:

[0032] A stator is coaxially arranged on the valve plate and sleeved on the outside of the threaded column through hole, and a plurality of electromagnets 2 are embedded in the stator and are evenly spaced in the circumferential direction;

[0033] Two permanent magnets are symmetrically embedded in the rotor, and the permanent magnets are magnetically connected to the electromagnet 2.

[0034] Optionally, the water injection and exhaust assembly includes:

[0035] A top cover is axially connected to the top of the extension tube, and the top cover is provided with a through hole for the threaded column to pass through. An exhaust valve is provided on one side of the top cover, one end of the exhaust valve is connected to the atmosphere, and the other end of the exhaust valve is connected to the interior of the extension tube. A water injection valve is provided on the other side of the top cover, the water inlet end of the water injection valve is connected to the water outlet end of the ground test system, and the water outlet end of the water injection valve is connected to the interior of the extension tube.

[0036] Optionally, the extension tube is threadedly connected to the sensor mounting tube, the sensor mounting tube is threadedly connected to the sensor assembly, the sensor assembly is threadedly connected to the pipe body, the test section connecting tube is threadedly connected to the pipe body, and the mounting plate is threadedly connected to the pipe body.

[0037] Compared with the prior art, the present invention has the following advantages and technical effects:

[0038] During use, the extension pipe is connected to the lifting equipment, and the downhole device is lowered into the borehole. After being lowered to the specified height, the driving part drives the clamping head to deform and clamp it in the borehole, so that the downhole device is initially fixed. Then, the deformation of the deformation part of the embolization tube is controlled by the ground test system to clamp the downhole device to the borehole. When the deformation part is deformed, it slides on the outside of the tube body without affecting the position of the test section connecting pipe. At the same time, the borehole is sealed, which facilitates the fixation of the downhole device and the formation of the test section. This device can accurately fix the downhole device at the specified position of the borehole through the cooperation of the embolization tube and the clamping head, thereby improving the test accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings:

[0040] Figure 1 Structural schematic diagram of the present invention;

[0041] Figure 2 For the present invention Figure 1 Partial enlarged view at position A in the present invention;

[0042] Figure 3 For the present invention Figure 1 Partial enlarged view at position B in the present invention;

[0043] Figure 4 For the present invention Figure 1 Partial enlarged view at position C in the present invention;

[0044] Figure 5 Top view of the downhole valve structure of the present invention;

[0045] Figure 6 Sectional view of the connecting pipe structure of the test section of the present invention;

[0046] Figure 7 Axonometric view of the embolization tube of the present invention;

[0047] Wherein, 1, extension pipe; 2, sensor installation pipe; 3, sensor assembly; 4, embolization tube; 5, test section connecting pipe; 6, clamping head; 7, downhole valve; 8, top cover; 9, exhaust valve; 10, water injection valve; 401, pipe body one; 402, chute; 403, electromagnet one; 404, slip ring; 405, rubber balloon; 501, pipe body two; 502, exhaust hole; 503, water injection hole; 601, rubber head; 602, threaded plate; 603, mounting plate; 604, threaded column; 701, valve plate; 702, baffle; 703, stator; 704, rotor; 705, water permeable hole; 706, electromagnet two; 707, permanent magnet; 708, threaded column through hole. Detailed implementation manners

[0048] Drilling hydrogeological tests are important technical means to obtain permeability parameters of rock and soil layers and dynamic characteristics of groundwater. The core purpose is to calculate key indicators such as permeability coefficient and transmissivity by injecting water, pumping water or pressing water into the borehole, combined with the monitoring of parameters such as water head pressure, flow rate and time, providing a scientific basis for groundwater resource evaluation, engineering geological stability analysis, etc. Such tests include various types such as pumping tests, injection tests, pressure tests, micro-water tests and pulse tests, which are applicable to rock and soil layers with different permeabilities. For example, pumping tests calculate aquifer parameters through the relationship between drawdown and flow rate, injection tests measure the permeability of low-permeability strata by the constant-head or falling-head method, while pulse tests are for extremely low-permeability rock masses, and use the water head pressure recovery rate to deduce permeability parameters.

[0049] The double-packer drilling hydrogeological test equipment is the core tool in this field. Its traditional structure mainly consists of two parts: downhole and ground. The downhole device contains two expandable water-stop packers (packers), forms an isolated test section through connecting pipes, and is equipped with pressure sensors, temperature sensors and flow control valves. The ground system includes a data collector, a flowmeter, an injection / pumping pump and a control unit, and realizes real-time monitoring through cables or wireless transmission. The equipment controls the length of the test section by adjusting the distance between the packers, and uses nitrogen or hydraulic pressure to drive the packers to expand to seal the upper and lower hole sections, ensuring the isolation of the test section from other aquifers. For example, the heavy double-packer system of Solexperts in Switzerland can adapt to boreholes with a diameter of 96 - 280 mm, with a working depth of up to 2000 meters, and integrates high-precision sensors to synchronously record the water head pressure changes in the test section, the upper and lower hole sections.

[0050] The test principle of traditional double-packer equipment is based on Darcy's law and unsteady flow theory. Taking the pressure test as an example, a constant water head pressure is applied to the isolated test section, the change of the infiltrated water volume with time is observed, and the permeability coefficient is calculated through the formula K = Q / (2πLH) (where K is the permeability coefficient, Q is the stable flow rate, L is the length of the test section, and H is the water head height). The micro-water test instantaneously changes the water level in the test section and records its recovery process, and deduces parameters using the slope of the water level-time curve. The core advantage of the equipment lies in its ability to conduct layered tests. For example, in low-permeability fractured rock masses, the double-packer can accurately isolate the target aquifer, avoid hydraulic interference between different layers, and at the same time collect undisturbed groundwater samples through the supporting sampling device, providing reliable data for water quality analysis. This technology not only improves the accuracy of parameter acquisition, but also significantly reduces the well-washing difficulty and cost of traditional full-hole tests, becoming the standard method for studying complex hydrogeological conditions.

[0051] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0052] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0053] Reference Figures 1 to 7 The present invention discloses a multifunctional constant pressure penetration test system and device, including a downhole device and a surface test system. The downhole device includes:

[0054] Extension pipe 1, the top of the extension pipe 1 is provided with a water injection and exhaust assembly;

[0055] The sensor installation tube 2 is connected to the bottom of the extension tube 1 and is axially connected to the extension tube 1. The sensor installation tube 2 is provided with a sensor assembly 3 electrically connected to the ground test system.

[0056] Two embolic tubes 4 are connected by a test section connecting tube 5. The top embolic tube 4 is connected to the bottom of the sensor mounting tube 2 and is axially connected. The bottom embolic tube 4 is fixed with a clamping head 6. The test section connecting tube 5 is axially connected to the embolic tube 4. The embolic tube 4 includes a tube body 401 and a deformation portion sleeved on the outside of the tube body 401. The outside of the tube body 401 is provided with a slide groove 402. The deformation portion is slidably arranged on the outside of the tube body 401 through the slide groove 402.

[0057] The clamping head 6 is connected to a driving part, and the driving part drives the clamping head 6 to deform and clamp at the bottom of the drill hole;

[0058] The downhole valve 7 is fixedly connected in the test section connecting pipe 5. The downhole valve 7 is used to control the connection and disconnection between the test section connecting pipe 5 and the embolization pipe 4 located at the top.

[0059] During use, the extension tube 1 is connected to the lifting equipment, and the downhole device is lowered into the borehole. After being lowered to the specified height, the driving part drives the clamping head 6 to deform and clamp it in the borehole, so that the downhole device is initially fixed. Then, the deformation of the deformation part of the embolization tube 4 is controlled by the ground test system to clamp the downhole device to the borehole. When the deformation part is deformed, it slides on the outside of the tube body 401 without affecting the position of the test section connecting tube 5. At the same time, the borehole is sealed, which facilitates the fixation of the downhole device and the formation of the test section. The device can accurately fix the downhole device at the specified position of the borehole through the cooperation of the embolization tube 4 and the clamping head 6, thereby improving the test accuracy.

[0060] The ground test system includes a data acquisition system, a flowmeter, a pressure and flow control board, a booster pump, and a reservoir. The data acquisition system is electrically connected to the flowmeter and the sensor assembly 3.

[0061] The sensor assembly 3 includes a pressure sensor and a temperature sensor.

[0062] The types of the ground test system and the sensors belong to the prior art and will not be elaborated here.

[0063] As an alternative embodiment, the deformation part includes:

[0064] Two slip rings 404 are slidably arranged outside the chute 402. An elastic part is provided between the two slip rings 404 and is sleeved outside the chute 402.

[0065] A rubber balloon 405 has its two ends respectively fixed to the corresponding slip rings 404.

[0066] An electromagnet 403 is embedded in the pipe body 401. The electromagnet 403 is located in the middle of the chute 402 and is magnetically connected to the slip rings 404.

[0067] The pipe body 401 is made of insulating material. After the electromagnet 403 is energized to generate a magnetic field, under the action of the magnetic field, the two slip rings 404 are attracted to the middle of the electromagnet 403, compressing the elastic part. After the electromagnet 403 is powered off and the magnetic field disappears, the elastic part drives the two slip rings 404 to reset.

[0068] As an alternative embodiment, the elastic part includes a spring which is sleeved outside the chute 402.

[0069] After the electromagnet 403 is energized to generate a magnetic field, due to the magnetic force generated by the electromagnet 403 pulling towards the center, the slip rings 404 located on both sides of the electromagnet 403 will be attracted to move towards the middle and squeeze the spring. At the same time, it drives the rubber balloon 405 to expand outwards, so that the outer wall of the rubber balloon 405 presses against the side wall of the drill hole to form a seal. When the electromagnet 403 is powered off, the magnetic force disappears, and the spring returns to its initial length, pushing the two slip rings 404 to move away from each other until they reset.

[0070] As an alternative embodiment, the test section connecting pipe 5 includes:

[0071] A pipe body 501 has its two ends respectively fixed to the ends of the corresponding plugging pipe 4.

[0072] An exhaust hole 502 is opened at the top of the pipe body 501.

[0073] A water injection hole 503 is opened at the bottom of the pipe body 501.

[0074] As an alternative implementation, the clamping head 6 includes:

[0075] The rubber head 601 is fixedly connected to the bottom of the plug tube 4 at the bottom through the mounting plate 603, and the rubber head 601 is in transmission connection with the driving part.

[0076] As an alternative implementation, the driving part includes:

[0077] The threaded plate 602 is pivotally connected to the bottom of the mounting plate 603;

[0078] The threaded column 604 is threadedly connected to the middle of the threaded plate 602. The bottom end of the threaded column 604 is rotatably connected to the inner wall of the rubber head 601. The top end of the threaded column 604 passes through the mounting plate 603 and extends upward. After passing through the inner cavity formed by the extension tube 1, the sensor mounting tube 2, the plug tube 4, and the test section connecting tube 5, it passes through the middle of the water injection and exhaust assembly.

[0079] During use, rotate the threaded column 604 to make the threaded column 604 rise and fall on the threaded plate 602 under the action of the thread, driving the rubber head 601 to deform. After the inner wall of the rubber head 601 approaches the threaded plate 602, the side wall of the rubber head 601 is extruded to contact and press against the inner wall of the drilled hole, so as to fix the downhole device.

[0080] As an alternative implementation, the downhole valve 7 includes:

[0081] The valve plate 701 is pivotally connected inside the second pipe body 501. Two symmetrically arranged water permeable holes 705 are provided on the valve plate 701, and a threaded column through hole 708 for the threaded column 604 to pass through is provided in the middle of the valve plate 701;

[0082] The rotor 704 is rotatably arranged on the valve plate 701. The rotor 704 is coaxially arranged with the valve plate 701. Two symmetrically fixed blocking pieces 702 for blocking the water permeable holes 705 are fixedly connected to both ends of the rotor 704;

[0083] The rotation driving part is in transmission connection with the rotor 704, and the rotation driving part is arranged on the valve plate 701.

[0084] As an alternative implementation, the rotation driving part includes:

[0085] The stator 703 is coaxially arranged on the valve plate 701, and the stator 703 is sleeved outside the threaded column through hole 708. A number of electromagnets II 706 are embedded in the stator 703 at equal intervals in the circumferential direction;

[0086] Two permanent magnets 707 are symmetrically embedded in the rotor 704, and the permanent magnets 707 are magnetically connected to the electromagnets II 706.

[0087] When it is necessary to control the water supply to the connecting pipe 5 of the test section, by supplying power to each electromagnet II 706, the polarities between two adjacent electromagnets II 706 are made opposite. At this time, through the magnetic connection between the electromagnet II 706 and the permanent magnet 707, the rotor 704 can be driven to rotate relative to the stator 703, so that the baffle 702 covers or moves away from the water permeable hole 705, realizing the on-off of the connecting pipe 5 of the test section.

[0088] After the baffle 702 rotates to the specified position, by adjusting the polarity of the electromagnet II 706 corresponding to the permanent magnet 707, the position of the baffle 702 can be fixed by magnetic attraction.

[0089] As an alternative embodiment, the water injection and exhaust assembly includes:

[0090] The top cover 8 is axially connected to the top of the extension pipe 1. The top cover 8 is provided with a through hole for the threaded post 604 to pass through. One side of the top cover 8 is provided with an exhaust valve 9. One end of the exhaust valve 9 is communicated with the atmosphere, and the other end of the exhaust valve 9 is communicated with the inside of the extension pipe 1. The other side of the top cover 8 is provided with a water injection valve 10. The water inlet end of the water injection valve 10 is communicated with the water outlet end of the ground test system, and the water outlet end of the water injection valve 10 is communicated with the inside of the extension pipe 1.

[0091] As an alternative embodiment, the extension pipe 1 is threadedly connected to the sensor installation pipe 2, the sensor installation pipe 2 is threadedly connected to the sensor assembly 3, the sensor assembly 3 is threadedly connected to the pipe body I 401, the connecting pipe 5 of the test section is threadedly connected to the pipe body I 401, and the mounting plate 603 is threadedly connected to the pipe body I 401.

[0092] The threaded connection between pipe fittings is convenient for the disassembly and assembly of downhole devices on the one hand, and also convenient for adapting to pipe fittings of different lengths to suit drill holes of different depths. At the same time, through the detachable connection method, it can be switched between the double plug mode and the single plug mode, realizing multiple functions of a set of downhole devices.

[0093] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0094] The above-described embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention should fall within the protection scope determined by the claims of the present invention.

Claims

1. A multifunctional constant-pressure penetration testing system and device, comprising a downhole device and a ground test system, characterized in that, The downhole device includes: An extension pipe (1), with a water injection and exhaust assembly provided at the top of the extension pipe (1); A sensor installation pipe (2), communicatively connected to the bottom of the extension pipe (1). The sensor installation pipe (2) is axially connected to the extension pipe (1), and a sensor assembly (3) electrically connected to the ground test system is provided inside the sensor installation pipe (2); Two plugging pipes (4), with a test section connecting pipe (5) communicatively connected between the two plugging pipes (4). The plugging pipe (4) at the top is communicatively connected and axially connected to the bottom of the sensor installation pipe (2), and a clamping head (6) is fixedly connected to the plugging pipe (4) at the bottom. The test section connecting pipe (5) is axially connected to the plugging pipe (4); The plugging pipe (4) includes a first pipe body (401) and a deformation part sleeved outside the first pipe body (401). A chute (402) is provided on the outside of the first pipe body (401), and the deformation part is slidably arranged on the outside of the first pipe body (401) through the chute (402); The clamping head (6) is drivingly connected to a driving part, and the driving part drives the clamping head (6) to deform and be clamped at the bottom of the drilling hole; A downhole valve (7), fixedly connected inside the test section connecting pipe (5), and the downhole valve (7) is used to control the on-off of the test section connecting pipe (5) and the plugging pipe (4) at the top; 2. The multifunctional constant-pressure penetration testing system and device according to claim 1, characterized in that, The deformation part includes: Two sliding rings (404), slidably arranged outside the chute (402). An elastic part is provided between the two sliding rings (404), and the elastic part is sleeved outside the chute (402); A rubber balloon (405), with both ends respectively fixed to the corresponding sliding rings (404); An electromagnet I (403), embedded in the first pipe body (401), the electromagnet I (403) is located in the middle of the chute (402), and the electromagnet I (403) is magnetically connected to the sliding ring (404); The first pipe body (401) is made of an insulating material. After the electromagnet I (403) is energized to generate a magnetic field, under the action of the magnetic field, the two sliding rings (404) are attracted to the middle of the electromagnet I (403), so that the elastic part is compressed. After the electromagnet I (403) is powered off and the magnetic field disappears, the elastic part drives the two sliding rings (404) to reset; 3. A multifunctional constant-pressure penetration testing system and device according to claim 2, characterized in that, The elastic part includes a spring, and the spring is sleeved outside the chute (402); 4. A multifunctional constant-pressure penetration testing system and device according to claim 2, characterized in that, The test section connecting pipe (5) includes: A second pipe body (501), with both ends respectively fixed to the ends of the corresponding plugging pipes (4); An exhaust hole (502), opened at the top of the second pipe body (501); A water injection hole (503), opened at the bottom of the second pipe body (501); 5. A multifunctional constant-pressure penetration testing system and device according to claim 4, characterized in that, The clamping head (6) includes: A rubber head (601), fixedly connected to the bottom of the plugging pipe (4) at the bottom through a mounting plate (603), and the rubber head (601) is drivingly connected to the driving part; 6. The multifunctional constant pressure penetration test system and device according to claim 5, characterized in that, The driving part includes: A threaded plate (602), axially connected to the bottom of the mounting plate (603); The threaded post (604) is threadedly connected to the middle of the threaded plate (602). The bottom end of the threaded post (604) is rotatably connected to the inner wall of the rubber head (601). The top end of the threaded post (604) penetrates through the mounting plate (603) and extends upward. After passing through the inner cavity formed by connecting the extension tube (1), the sensor mounting tube (2), the plug tube (4), and the test section connecting tube (5), it penetrates through the middle of the water injection and exhaust assembly.

7. A multifunctional constant-pressure penetration testing system and device according to claim 6, characterized in that, The downhole valve (7) includes: A valve plate (701) pivotally connected inside the second pipe body (501). Two symmetrically arranged water permeable holes (705) are formed in the valve plate (701). A threaded post through hole (708) for the threaded post (604) to pass through is provided in the middle of the valve plate (701); A rotor (704) rotatably arranged on the valve plate (701). The rotor (704) is coaxially arranged with the valve plate (701). Two symmetrically fixed baffles (702) for blocking the water permeable holes (705) are fixedly connected to both ends of the rotor (704); A rotational driving part, drivingly connected to the rotor (704), and the rotational driving part is arranged on the valve plate (701).

8. A multifunctional constant pressure penetration testing system and device according to claim 7, characterized in that, The rotational driving part includes: A stator (703) coaxially arranged on the valve plate (701), and the stator (703) is sleeved outside the threaded post through hole (708). A plurality of electromagnets two (706) arranged at equal intervals in the circumferential direction are embedded in the stator (703); Two permanent magnets (707) symmetrically embedded in the rotor (704), and the permanent magnets (707) are magnetically connected to the electromagnets two (706).

9. A multifunctional constant-pressure penetration testing system and device according to claim 6, characterized in that, The water injection and exhaust assembly includes: A top cover (8) pivotally connected to the top of the extension tube (1). A through hole for the threaded post (604) to pass through is provided in the top cover (8). An exhaust valve (9) is provided on one side of the top cover (8). One end of the exhaust valve (9) is communicated with the atmosphere, and the other end of the exhaust valve (9) is communicated with the inside of the extension tube (1). A water injection valve (10) is provided on the other side of the top cover (8). The water inlet end of the water injection valve (10) is communicated with the water outlet end of the ground test system, and the water outlet end of the water injection valve (10) is communicated with the inside of the extension tube (1).

10. A multifunctional constant-pressure penetration testing system and device according to claim 6, characterized in that: The extension tube (1) is threadedly connected to the sensor mounting tube (2), the sensor mounting tube (2) is threadedly connected to the sensor assembly (3), the sensor assembly (3) is threadedly connected to the first pipe body (401), the test section connecting tube (5) is threadedly connected to the first pipe body (401), and the mounting plate (603) is threadedly connected to the first pipe body (401).

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