A drilling mud high and low pressure measuring device with reset and pressure adjustment function

Abstract

This utility model relates to the technical field of drilling mud pressure measuring devices in petroleum engineering, and discloses a drilling mud high and low pressure measuring device with reset and pressure adjustment function. It includes a pressure measuring flange, which has a buffer chamber and a pressure transmission channel that are interconnected. A pressure measuring mechanism is installed in the pressure transmission channel. The buffer chamber contains a reciprocating piston that separates the hydraulic oil filling the buffer chamber and the pressure transmission channel from the mud channel at the lower end. The upper end of the pressure measuring flange has an opening communicating with the buffer chamber, and a reset and pressure adjustment mechanism for pushing the piston to reset is installed in the opening. This utility model's high and low pressure conversion measuring device can force the piston in the buffer chamber to reset through external force without discharging some of the hydraulic oil inside the pressure measuring flange, solving the problem of incomplete piston reset in existing high and low pressure conversion measuring devices, and ensuring accurate matching between the hydraulic oil pressure inside the measuring flange and the actual pressure of the drilling system.

Description

Technical Field

[0001] This utility model relates to the technical field of drilling mud pressure measuring devices for petroleum engineering, and more specifically to a drilling mud high and low pressure measuring device with reset and pressure adjustment function. Background Technology

[0002] During oilfield drilling, it is necessary to monitor mud pressure and determine the bottom-hole conditions based on the mud pressure readings, thereby formulating appropriate measures to maintain bottom-hole balance. In the oil drilling field, high-low pressure conversion measurement devices are core equipment connecting the drilling fluid circulation system and the pressure measurement system. They are used to accurately convert the pressure of high and low pressure fluids during drilling into high and low pressure signals for transmission to the outside of the well, achieving safe, stable, and high-precision pressure measurement and data transmission, providing crucial data support for drilling safety and process optimization.

[0003] In existing high and low pressure measuring devices, pressurized drilling mud flows through the pressure-measuring flange. The drilling mud first enters the mud channel within the measuring device, and then enters the guide hole through the mud channel, generating pressure that pushes upward against the piston in the buffer chamber. The piston moves upward, and the buffer chamber and through hole are filled with hydraulic oil. For example, in the utility model with publication number CN212656790U, if the drilling mud is high pressure, the low-pressure end valve is closed and the high-pressure end valve is opened. The piston, under the action of the drilling mud in the mud channel below, squeezes the hydraulic oil in the buffer chamber, thereby transmitting the pressure to the high-pressure end pressure gauge, which displays the high-pressure value in real time. If the drilling mud is low pressure, the high-pressure end valve is closed and the low-pressure end valve is opened. The piston transmits the pressure to the low-pressure end pressure gauge through the hydraulic oil, which displays the low-pressure value of the mud in real time.

[0004] When the aforementioned high-low pressure conversion measuring device continues to operate, impurities carried by the drilling mud can become trapped in the seal between the piston and the buffer chamber, as well as in the step surface within the buffer chamber used to limit the piston's disengagement. This prevents the piston from fully returning to its original position after reset, causing the hydraulic oil in the buffer chamber to remain in a compressed state and continuously pressurize the pressure gauge on the pressure measuring flange. Ultimately, this manifests as the drilling fluid being completely depressurized or in a depressurized state, while the pressure gauge fails to return to zero.

[0005] When the above situation occurs, on-site operators usually loosen the pressure relief screw under the pressure gauge to release some hydraulic oil, allowing the hydraulic oil pressure in the entire pressure testing flange to return to normal, and the pressure gauge reading to zero. However, if this continues, the hydraulic oil in the pressure testing flange will continue to decrease. Insufficient oil will cause the piston in the buffer chamber to move upwards repeatedly until the upper end of the piston contacts the bottom surface of the blockage. The drilling hydraulic pressure cannot be transmitted to the hydraulic oil, resulting in a situation where the drilling fluid is pressurized, but the pressure gauge does not show any reading. This affects the judgment of the wellhead pressure and ultimately leads to a well control accident.

[0006] Furthermore, it is known that the high-low pressure conversion measuring device is short of hydraulic oil, and the dead plug must be removed before hydraulic oil can be added. At this time, the reading on the pressure gauge will be distorted. If there is pressure in the drilling fluid, once the dead plug is removed, the internal piston will be pushed out by the pressure, which poses a safety hazard of injury. Summary of the Invention

[0007] To address the problems and shortcomings of existing high and low pressure conversion measuring devices, such as piston jamming due to drilling mud impurities, pressure measurement distortion, hydraulic oil loss, and safety hazards associated with adding hydraulic oil, this utility model specifically proposes a drilling mud high and low pressure measuring device with reset and pressure adjustment functions. To achieve the above-mentioned objectives, the technical solution of this utility model is as follows: This utility model provides a drilling mud high and low pressure measuring device with reset and pressure adjustment function. The high and low pressure conversion measuring device with reset and pressure adjustment function includes a pressure measuring flange installed on the wellhead choke manifold or kill manifold. The pressure measuring flange is provided with a buffer cavity and a pressure transmission channel that are interconnected. The buffer cavity is arranged vertically and the pressure transmission channel is arranged horizontally. A pressure measuring mechanism is provided at the pressure transmission channel. The buffer chamber is equipped with a reciprocating piston, which separates the hydraulic oil filling the buffer chamber and the pressure transmission channel from the mud channel on the pressure measuring flange. The upper end of the pressure measuring flange has an opening communicating with the buffer chamber, and a reset pressure regulating mechanism for pushing the piston in the buffer chamber to reset is provided in the opening.

[0008] Preferably, the reset pressure regulating mechanism squeezes the hydraulic oil in the buffer chamber, forcing the hydraulic oil to push the piston to reset.

[0009] Preferably, the opening is provided with a plug, and the plug is provided with a pressure regulating chamber communicating with the buffer chamber. The reset pressure regulating mechanism is located in the pressure regulating chamber. The reset pressure regulating mechanism moves back and forth in the pressure regulating chamber, squeezing the hydraulic oil in the buffer chamber and forcing the hydraulic oil to push the piston to reset.

[0010] Preferably, the reset pressure regulating mechanism includes a reset pressure regulating rod disposed in the pressure regulating cavity, the reset pressure regulating rod being threadedly connected to a connecting nut disposed on the plug, and a piston head disposed on the reset pressure regulating rod to cooperate with the inner wall of the pressure regulating cavity.

[0011] Preferably, the pressure measuring mechanism includes a first pressure gauge and a second pressure gauge arranged at different heights on the pressure measuring flange.

[0012] Preferably, the pressure measuring mechanism includes a pressure transmitter.

[0013] Preferably, the first pressure gauge and the second pressure gauge are respectively installed on the pressure measuring flange via protective connectors.

[0014] Preferably, the pressure transmitter is mounted on the pressure measuring flange via a movable joint.

[0015] Preferably, the protective connector is provided with a pressure relief screw. Preferably, the left and right ends of the pressure measuring flange protrude outward to form two lifting lugs.

[0016] The beneficial effects of this utility model are: 1. This invention features a reset and pressure regulating mechanism at the upper opening of the buffer chamber. This mechanism actively squeezes and pushes the hydraulic oil within the buffer chamber, forcing it to exert a downward thrust on the piston. Even if the piston is stuck due to impurities and cannot return to its original position autonomously, the reset and pressure regulating mechanism can drive the piston back to its original position through external force, solving the problem of incomplete piston reset in existing high-low pressure conversion measuring devices. This invention ensures accurate matching between the hydraulic oil pressure inside the measuring flange and the actual pressure of the drilling system, preventing the pressure measuring mechanism from displaying false pressure values ​​and providing reliable data support for operators to determine wellbore balance. 2. The reset and pressure regulating mechanism installed at the upper opening of the buffer chamber in this utility model can actively regulate the pressure of the hydraulic oil in the buffer chamber. By using external force to force the piston back to its original position, the hydraulic oil pressure in the buffer chamber returns to its initial value. Therefore, when pressure distortion occurs in the device, operators do not need to frequently open the pressure relief screw to drain oil and reduce pressure. Operating the reset and pressure regulating mechanism can achieve the effect of the piston resetting itself, thereby regulating the hydraulic oil pressure in the buffer chamber and ultimately bringing the pressure gauge reading to zero. The entire operation process will not cause a continuous decrease in the hydraulic oil in the buffer chamber, which would prevent the piston from repeatedly moving upwards and failing to return to its original position, ultimately failing to effectively transmit the pressure in the mud channel.

[0017] 3. The two pressure gauges on the pressure measuring flange of this utility model are arranged at different heights, allowing on-site operators to quickly distinguish between the low-pressure gauge and the high-pressure gauge, thereby achieving the effect of rapid and accurate reading. 4. This utility model installs a pressure transmitter at the pressure transmission channel of the pressure measuring flange as a pressure measuring mechanism. The pressure transmitter can not only accurately measure the pressure in the channel, but also has a digital display function, which can display the pressure value in real time and intuitively. At the same time, it can transmit the real-time measurement data to the remote end through the signal line, realize the real-time monitoring of pressure and remote data acquisition, which is convenient to operate and efficient in data transmission, thus improving the convenience of pressure measurement.

[0018] 5. This utility model has lifting lugs protruding outward at both ends of the pressure measuring flange. When installing the measuring device on site, the measuring device can be lifted and installed through the lifting lugs on both sides. Compared with the traditional manual handling and lifting method, the installation is more convenient and faster, and the installation docking can be better achieved.

[0019] 6. The first and second pressure gauges of this utility model are respectively installed on the pressure measuring flange through corresponding protective connectors. When the pressure gauges need to be disassembled for periodic calibration, the connection of the pressure measuring flange can be protected, the service life of the pressure measuring flange can be extended, and long-term measurement accuracy can be guaranteed. Attached Figure Description

[0020] The foregoing and hereinafter detailed description of this utility model becomes clearer when read in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the high and low pressure measuring device with reset and pressure adjustment function in Example 3; Figure 2 This is a schematic diagram of the high and low pressure measuring device with reset and pressure adjustment function in Example 4.

[0021] In the attached image: 1. Pressure testing flange; 2. Buffer chamber; 3. Pressure transmission channel; 4. Mud channel; 5. Piston; 6. Reset pressure regulating mechanism; 7. Plug; 9. First pressure gauge; 11. Second pressure gauge; 12. Protective connector; 13. Pressure transmitter; 14. Pressure relief screw; 15. Explosion-proof box; 16. Movable connector; 17. Lifting lug; 61. Reset pressure regulating rod; 62. Piston head; 71. Pressure regulating chamber. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions of this utility model, the following will further illustrate the technical solutions for achieving the purpose of this utility model through several specific embodiments. It should be noted that the technical solutions claimed by this utility model include, but are not limited to, the following embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this utility model.

[0023] Example 1 In one of the most basic embodiments of this utility model, the high-low pressure conversion measuring device with reset and pressure adjustment function includes a pressure measuring flange 1 and a reset and pressure adjustment mechanism 6 disposed on the pressure measuring flange 1; wherein... The pressure testing flange 1 is provided with a vertical buffer chamber 2 in the radial direction and a horizontal pressure transmission channel 3 in the transverse direction. The upper end of the buffer chamber 2 is connected to the horizontally arranged pressure transmission channel 3. The center of the pressure testing flange 1 is also provided with a mud channel 4, which is located at the lower end of the buffer chamber 2. A pressure measuring mechanism is provided on the flange wall of the pressure measuring flange 1 at the pressure transmission channel 4, and valves for closing the pressure transmission channel are provided at both ends of the pressure measuring flange 1. The buffer chamber 2 and the pressure transmission channel 3 are filled with freely flowing hydraulic oil. A piston 5 that can reciprocate within the buffer chamber 2 is slidably installed in the buffer chamber 2. The piston 5 cooperates with the valve at the end of the pressure transmission channel 3 to separate the hydraulic oil in the buffer chamber 2 and the pressure transmission channel 3 from the mud channel 4 below and the outside. That is, the hydraulic oil is sealed in the closed space formed by the piston 5, the inner wall of the buffer chamber 2, the inner wall of the pressure transmission channel 3 and the valve at the flange end. The upper end of the buffer chamber 2 passes through the pressure measuring flange 1, forming an opening on the upper end face of the pressure measuring flange 1 that can communicate with the outside. A plug 7 for sealing the opening is provided in the opening, and a reset pressure regulating mechanism 6 for pushing the piston 5 to reset is installed on the plug 7.

[0024] Specifically, the reset pressure regulating mechanism 6 can reciprocate along the axial direction of the plug 7, squeezing and pushing the hydraulic oil in the pressure measuring flange 1 (the hydraulic oil in the buffer chamber 2 and the pressure transmission channel 3), forcing the hydraulic oil to push the piston 5 in the buffer chamber 2 back to its original position, that is, the piston 5 finally returns to the step surface that abuts against the inner wall of the buffer chamber 2.

[0025] It is understood that the outer circumferential surface of the plug 7 is provided with external threads, and the upper end of the inner wall of the buffer cavity 2 is provided with internal threads. The plug 7 is threadedly connected to the inner wall of the buffer cavity 2, and thus fixedly installed on the pressure measuring flange 1.

[0026] In the embodiment described in this invention, the pressure testing flange 1 is installed on the choke manifold or kill manifold at the wellhead, and the mud channel 4 on the pressure testing flange 1 is connected to the manifold. When the drilling mud in the manifold flows through the mud channel 4 on the pressure testing flange 1, the piston 5, under the action of the drilling mud below, squeezes the hydraulic oil in the buffer chamber 2 and the pressure transmission channel 3 connected to the buffer chamber 2, thereby transmitting the pressure to the pressure measuring mechanism at the pressure transmission channel 3. The pressure measuring mechanism measures and displays the pressure value of the fluid in the mud channel 4 at the corresponding time in real time. After the measurement is completed, if the drilling fluid is completely depressurized or in a depressurized state and the reading of the pressure measuring mechanism cannot return to zero, it indicates that the piston 5 may be stuck and unable to reset. At this time, the reset pressure regulating mechanism 6 is operated. By applying external force, the reset pressure regulating mechanism 6 moves back and forth along the axial direction of the plug 7, squeezing and pushing the hydraulic oil in the pressure testing flange 1, forcing the hydraulic oil to push the piston in the buffer chamber 2 back to its original position, thereby returning the hydraulic oil pressure in the entire pressure testing flange 1 to the normal value, and the reading of the pressure measuring mechanism returns to zero.

[0027] Example 2 Based on Embodiment 1, the plug 7 has an axially extending pressure regulating chamber 71 that communicates with the buffer chamber 2. The reset pressure regulating mechanism 6 is located inside the pressure regulating chamber 71. The reset pressure regulating mechanism 6 moves axially back and forth within the pressure regulating chamber 71, squeezing and compressing the hydraulic oil in the buffer chamber 2, causing the hydraulic oil to push the piston 5 in the buffer chamber 2 to reset. Since the pressure regulating chamber 71 is connected to the buffer chamber 2, the pressure regulating chamber 2 is also filled with hydraulic oil.

[0028] In the embodiment described in this utility model, the reset pressure regulating mechanism 6 and the pressure regulating chamber 71 cooperate to form a piston mechanism, and its working principle is the same as that of a piston. When an external force is applied to make the reset pressure regulating mechanism 6 move axially toward the buffer chamber 2 in the pressure regulating chamber 71, the reset regulating mechanism 6 squeezes the hydraulic oil in the entire pressure measuring flange 1. After being squeezed, the hydraulic oil applies hydraulic pressure to the piston 5, pushing the piston in the buffer chamber 2 to be forcibly reset.

[0029] After piston 5 is forcibly reset, the operation reset pressure regulating mechanism 6 is reset back to the starting position, the squeezing force on the hydraulic oil in the pressure measuring flange 1 disappears, the hydraulic oil pressure in the entire pressure measuring flange 1 returns to the normal value, and the reading of the pressure measuring mechanism on the pressure measuring flange 1 returns to zero synchronously.

[0030] Furthermore, in some embodiments, the reset pressure regulating mechanism 6 is a reset pressure regulating rod 61 disposed in the pressure regulating cavity 71, with a connecting nut provided on the plug. The reset pressure regulating rod 61 is threadedly connected to the connecting nut provided on the plug 7, and the end of the reset pressure regulating rod 61 located in the pressure regulating cavity 71 is provided with a piston head 62 that mates with the inner wall of the pressure regulating cavity 71, and the end of the reset pressure regulating rod 61 located outside the pressure regulating cavity 71 is provided with an operating handle.

[0031] After rotating the operating handle, the reset pressure regulating rod 61 drives the piston head 62 at its end to move axially within the pressure regulating chamber 71, towards the buffer chamber 2. The piston head 62 compresses the hydraulic oil in the entire pressure measuring flange 1 and the pressure regulating chamber 71. The hydraulic oil, under this compression, applies hydraulic pressure to the piston 5, forcibly resetting the piston 5 within the buffer chamber 2. Reversing the operating handle causes the reset pressure regulating rod 61 to move away from the buffer chamber 2, gradually resetting the hydraulic oil pressure within the entire pressure measuring flange 1 back to its normal value, and the reading on the pressure measuring mechanism of the pressure measuring flange 1 also returns to zero.

[0032] In summary, the reset pressure regulating mechanism 6 achieves the effect of forcibly resetting the piston 5 in the buffer chamber 2 by adjusting the pressure of the hydraulic oil in the pressure measuring flange 1, thereby realizing that the pressure measuring mechanism reading on the pressure measuring flange 1 returns to zero and avoiding the pressure measuring mechanism from displaying false pressure values.

[0033] Example 3 Based on Embodiment 1 or Embodiment 2, the pressure measuring mechanism installed on the pressure measuring flange 1 includes a first pressure gauge 9 and a second pressure gauge 11, and both the first pressure gauge 9 and the second pressure gauge 11 are installed on the pressure measuring flange 1 via a protective connector 12. Figure 1 The protective connector 12 is installed on the pressure testing flange 1 via a threaded connection, and then the pressure gauge is threadedly connected to the protective connector 12. The protective connector 12 is provided with a pressure channel communicating with the pressure transmission channel 3, and also with a pressure relief hole communicating with the pressure channel. A pressure relief screw 14 is installed in the pressure relief hole to seal it. The pressure relief screw 14 can achieve the effect and function of fine adjustment of the hydraulic oil pressure inside the pressure testing flange 1. For example, when the temperature changes, the hydraulic oil inside the flange expands, and the pressure increases. After the reset pressure regulating mechanism 6 has been fully adjusted, pressure can be relieved by opening and loosening the pressure relief screw 14.

[0034] In the embodiment described in this utility model, two pressure gauges are installed on the pressure testing flange 1, one of which is a low-pressure gauge and the other is a high-pressure gauge. To enable on-site personnel to quickly distinguish between the low-pressure and high-pressure gauges and achieve rapid and accurate readings, the first pressure gauge 9 and the second pressure gauge 11 are arranged at opposite heights on the pressure testing flange 1. That is, the heights of the protective connectors corresponding to the two pressure gauges are different, one higher and the other lower, resulting in a staggered arrangement after installation.

[0035] Since the installation part of the pressure gauge will be damaged after repeated disassembly, in order to reduce the damage to the installation part of the pressure gauge, extend the service life of the pressure gauge, and ensure long-term measurement accuracy, this utility model installs the pressure gauge on the pressure measuring flange 1 through the protective connector 12, so that the pressure gauge body is not easily damaged.

[0036] And, as Figure 1 As shown, when two pressure gauges are installed on the pressure testing flange 1 as pressure measuring mechanisms, the two pressure gauges are respectively installed at both ends of the pressure transmission channel 3, and two valves are correspondingly installed at both ends of the pressure transmission channel 3. When the drilling mud is under high pressure, the valve at the low-pressure gauge end is closed, and the valve at the high-pressure gauge end is opened, with the high-pressure gauge displaying the high-pressure value in real time; if the drilling mud is under low pressure, the valve at the high-pressure gauge end is closed, and the valve at the low-pressure gauge end is opened, with the low-pressure gauge displaying the low-pressure value of the mud in real time.

[0037] Understandably, at the work site, the valve corresponding to the high-pressure gauge is always open. When the pressure value displayed by the pressure gauge in the high-pressure area is low and an accurate pressure value needs to be read, the valve at the high-pressure gauge is closed and the valve at the low-pressure gauge is opened.

[0038] Example 4 like Figure 2As shown, the difference between this embodiment and Embodiment 3 is that the pressure measuring mechanism is a pressure transmitter 13 mounted on the measuring flange 1, and the pressure transmitter 13 is mounted on the measuring flange 1 via a movable joint 16. The movable joint 16 can adjust the orientation of the pressure transmitter 13.

[0039] In the embodiment described in this utility model, the pressure transmitter 13 has a digital display function, which can display the pressure measurement value in the pressure transmission channel 3 measured in real time. The pressure measurement value corresponds to the pressure value of the fluid flowing through the mud channel 4 of the pressure measuring flange 1.

[0040] More specifically, in some embodiments, the pressure transmitter 13 is connected to the explosion-proof box 15 via a signal cable. The explosion-proof box 15 is equipped with a pressure alarm module. When the pressure value received by the pressure transmitter 13 exceeds the threshold, the alarm is triggered to promptly remind the on-site personnel.

[0041] Compared to installing a pressure gauge, the pressure transmitter 13 can display the pressure value in real time and transmit the real-time measurement data to a remote location via a signal line, enabling real-time pressure monitoring and remote data acquisition. This method is convenient to operate and provides efficient data transmission, significantly improving the ease of pressure measurement. Furthermore, and more importantly, because the pressure transmitter 13 can measure a wider pressure range and has higher measurement accuracy, the number of pressure measuring devices required can be reduced. In other words, a single pressure transmitter can handle both high and low pressure measurements.

[0042] Example 5 Based on any of the above embodiments, such as Figure 1 or Figure 2 As shown, the pressure measuring flange 1 has two horizontal lifting lugs 17 protruding outwards from its left and right ends. These lifting lugs 17 are used for the installation of the high-low pressure conversion measuring device. Specifically, when installing the conversion measuring device on site, the high-low pressure conversion measuring device can be lifted and installed using the lifting lugs 17 on both sides. Compared with the traditional manual handling and lifting method, the installation is more convenient and faster, and it can better achieve the installation docking.

[0043] It should be noted that the pressure alarm module and the alarm device mentioned above are well-known technologies in the field and are not improvements or innovations of this utility model. They will not be described in detail here.

[0044] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as an obstacle to the protection scope of this utility model.

[0045] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0046] The above description is merely a preferred embodiment of the present utility model and is not intended to hinder the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A drilling mud high and low pressure measuring device with reset and pressure adjustment function, characterized in that, Includes a pressure measuring flange (1) installed on the wellhead choke manifold or kill manifold, wherein the pressure measuring flange (1) is provided with a buffer chamber (2) and a pressure transmission channel (3) that are interconnected, and a pressure measuring mechanism is provided at the pressure transmission channel (3); The buffer chamber (2) has a reciprocating piston (5) that separates the hydraulic oil filling the buffer chamber (2) and the pressure transmission channel from the mud channel (4) at the lower end. The upper end of the pressure measuring flange (1) has an opening that communicates with the buffer chamber (2), and a reset pressure regulating mechanism (6) for pushing the piston (5) to reset is provided in the opening.

2. The drilling mud high and low pressure measuring device with reset and pressure adjustment function according to claim 1, characterized in that, A plug (7) is provided at the opening. The plug (7) is provided with a pressure regulating chamber (71) that communicates with the buffer chamber (2). The reset pressure regulating mechanism (6) is located in the pressure regulating chamber (71). The reset pressure regulating mechanism (6) moves back and forth in the pressure regulating chamber (71) to squeeze the hydraulic oil in the buffer chamber (2) and force the hydraulic oil to push the piston (5) to reset.

3. The drilling mud high and low pressure measuring device with reset and pressure adjustment function according to claim 2, characterized in that, The reset pressure regulating mechanism (6) includes a reset pressure regulating rod (61) disposed in the pressure regulating cavity (71). The reset pressure regulating rod (61) is threadedly connected to the connecting nut disposed on the plug (7). The reset pressure regulating rod (61) is provided with a piston head (62) that cooperates with the inner wall of the pressure regulating cavity.

4. The drilling mud high and low pressure measuring device with reset and pressure adjustment function according to claim 1, characterized in that, The pressure measuring mechanism includes a first pressure gauge (9) and a second pressure gauge (11) arranged at different heights on the pressure measuring flange (1).

5. A drilling mud high and low pressure measuring device with reset and pressure adjustment function according to claim 1, characterized in that, The pressure measuring mechanism includes a pressure transmitter (13).

6. A drilling mud high and low pressure measuring device with reset and pressure adjustment function according to claim 4, characterized in that, The first pressure gauge (9) and the second pressure gauge (11) are respectively installed on the pressure measuring flange (1) through the protective connector (12).

7. A drilling mud high and low pressure measuring device with reset and pressure adjustment function according to claim 5, characterized in that, The pressure transmitter (13) is mounted on the pressure measuring flange (1) via a movable joint (16).

8. A drilling mud high and low pressure measuring device with reset and pressure adjustment function according to claim 6, characterized in that, The protective connector (12) is provided with a pressure relief screw (14).

9. A drilling mud high and low pressure measuring device with reset and pressure adjustment function according to claim 1, characterized in that, The left and right ends of the pressure measuring flange (1) protrude outward to form two horizontal lifting lugs (17).

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