Continuous wave mud pressure pulse generator

Abstract

The invention discloses a continuous wave mud pressure pulse generator, and relates to the technical field of underground drilling tools, the continuous wave mud pressure pulse generator comprises a generator shell and a pulse generator valve, the pulse generator valve comprises a valve body shell, a motor rotor and a motor stator are arranged in the valve body shell, and a main shaft is fixed in the middle of the motor stator; the lower end of the main shaft is fixedly connected with the intelligent salvage controller, and the upper end extends out of the valve body shell and is movably connected with the salvage head; a piston cavity is formed in the main shaft, a movable extension rod and a piston plate are arranged in the piston cavity, and the two ends of the extension rod are fixedly connected with the piston plate and the fishing head respectively; an air pressure balance hole is formed in the bottom of the piston cavity; an electromagnetic valve is mounted in the air pressure balance hole; the movable salvage head is adopted, on one hand, the movable salvage head can be tightly attached to the top of the main shaft when the pulse generator normally operates, mutual influence between the salvage head and flowing mud is reduced, and the accuracy of information transmission is guaranteed; and on the other hand, the device can automatically move upwards to be in butt joint with salvage equipment during salvage, and the salvage reliability is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of downhole drilling tool technology, specifically to a continuous wave mud pressure pulse generator. Background Technology

[0002] Measurement while drilling (MSW) is a technology that transmits data from downhole instruments to the surface during oil drilling, playing a crucial role in ensuring safe and efficient drilling. MSW allows for the measurement of information difficult to obtain on the surface, such as drill bit torque, drilling pressure, inclination angle, azimuth angle, tool face angle, axial tension, three-phase acceleration, and formation characteristics like gamma rays and resistivity. MSW enables real-time monitoring of the drill bit's operating status, facilitates formation structure and simulation, enables formation evaluation, and allows the drill bit to advance efficiently through oil and gas reservoirs.

[0003] Currently, mud pulse transmission technology is the most widely used commercially, and there are three main types of mud pulse transmission methods: negative pulse, positive pulse, and continuous wave. Among them, Negative pulse signal generators have technical drawbacks such as easy signal interference, low signal transmission rate, and large energy loss, and are gradually being phased out.

[0004] Positive pulse signal generators provide relatively stable signals, and the downhole instruments have a simple structure, making them easy to use, operate, and maintain. However, their low transmission rate severely restricts the development of drilling information technology.

[0005] Continuous wave generators primarily utilize pulse generator valves and actuators installed within the housing assembly to control the opening, closing, or rotation of the pulse generator valves, altering the flow area of ​​the drilling mud within the drill string and thus generating continuous pressure pulsations. These pressure pulsations carry data measured by downhole instruments, such as drilling information like inclination, azimuth, and tool face angle. The data-carrying mud is transmitted through pipelines and then processed by the surface processing system. Continuous wave generators offer high information transmission rates, providing real-time and accurate downhole information, helping geologists and exploration personnel better understand geological conditions, optimize exploration plans, and improve exploration efficiency, thus leading to their increasingly widespread application.

[0006] In the existing technology, there are many related technologies involving continuous wave generators. For example, patent document CN203114280U discloses a downhole continuous wave mud pulse generator. To prevent the continuous wave generator carried by drilling equipment from falling into the mine, causing equipment loss and mine blockage, a mushroom-shaped retrieval head is usually installed on the top of the continuous wave generator. When the continuous wave generator falls, it can be retrieved by docking the retrieval head with retrieval equipment. However, in continuous wave generators represented by this patent document, the retrieval head is fixed to the upper end of the continuous wave generator and extends a certain distance. Although this structure does not affect retrieval, when the continuous wave generator is working normally, the mud carrying data information flows through the retrieval head. This causes an interaction between the retrieval head and the flowing mud, which can easily affect the information transmitted by the pressure pulsation generated by the continuous wave pulse generator, thus reducing the accuracy of information transmission. Summary of the Invention

[0007] To overcome the aforementioned problems in the prior art, this invention provides a continuous wave mud pressure pulse generator. Compared to existing technologies, this pulse generator employs a movable retrieval head. This retrieval head, on the one hand, can remain close to the top of the main shaft during normal operation of the pulse generator, thereby reducing the mutual influence between the retrieval head and the flowing mud and ensuring the accuracy of information transmission; on the other hand, it can automatically move upwards to facilitate docking with retrieval equipment when the pulse generator is lost and retrieval is required, thus ensuring the reliability of retrieval. This solves the technical problem that existing fixed retrieval heads easily affect the information transmitted by the pressure pulsations generated by the continuous wave pulse generator.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A continuous wave mud pressure pulse generator includes a generator housing, a pulse generator valve installed within the generator housing, and an actuator. The actuator is electrically connected to the pulse generator valve and is used to drive the pulse generator valve to operate. It also includes an intelligent salvage controller and a salvage head. The pulse generator valve includes a valve body shell fixed inside the generator housing. A motor rotor and a motor stator are respectively provided inside the valve body shell from top to bottom. A main shaft is fixed in the middle of the motor stator. The lower end of the main shaft passes through the valve body shell downward and is fixedly connected to the intelligent salvage controller. The upper end of the main shaft moves upward through the motor rotor and then extends out of the valve body shell and is movably connected to the salvage head. The main shaft has an open-top piston chamber, and a movable extension rod and a piston plate are respectively installed in the piston chamber. The lower end of the extension rod is fixedly connected to the piston plate through a connecting rod, and the upper end of the extension rod is fixedly connected to the retrieval head. After being fixed, the retrieval head fits against the upper end of the main shaft. A pressure balance hole connected to the piston chamber is opened on the main shaft at the position corresponding to the bottom of the piston chamber. A solenoid valve is installed in the pressure balance hole. The intelligent salvage controller includes a loss detection module, a salvage assistance module, a power supply module, a distance sensor, a pressure sensor one, and a pressure sensor two. The distance sensor is installed at the bottom of the piston plate and faces the bottom of the piston chamber. Pressure sensor one and pressure sensor two are respectively fixed on the outer and inner walls of the generator housing. The power supply module is electrically connected to the loss detection module and the salvage assistance module. The salvage assistance module is electrically connected to the loss detection module, the solenoid valve, and the distance sensor. The loss detection module is connected to pressure sensor one and pressure sensor two. The loss detection module can detect whether the pulse generator has been lost through pressure sensor one and pressure sensor two. When the pulse generator is lost, the salvage assistance module can control the salvage head to move up and detach from the main shaft through the solenoid valve.

[0009] The intelligent salvage controller also includes a bone conduction sensor, which is installed at the bottom of the piston chamber and electrically connected to the salvage auxiliary module.

[0010] The intelligent salvage controller also includes an auxiliary electromagnet, which is embedded in the upper middle part of the salvage head and electrically connected to the salvage auxiliary module.

[0011] The intelligent salvage controller also includes an inductive sensor, which is fixed to one side of the upper middle part of the salvage head and electrically connected to the salvage auxiliary module.

[0012] The power supply module includes a battery assembly and a power management module, which are electrically connected. The power management module is electrically connected to the loss detection module and the salvage assistance module, respectively.

[0013] The pressure sensor one and pressure sensor two are respectively embedded in the outer wall and inner wall of the generator housing.

[0014] The piston plate has several ventilation holes.

[0015] The piston chamber is a cylindrical structure, the piston plate is a disc-shaped structure adapted to the piston chamber, and the extension rod is a cylindrical structure adapted to the piston chamber.

[0016] The piston plate and the extension rod have the same outer diameter, and the outer diameters of both the piston plate and the extension rod are larger than the outer diameter of the connecting rod.

[0017] The retrieval head is mushroom-shaped, with a maximum diameter greater than that of the extension rod and a maximum diameter less than or equal to that of the main shaft.

[0018] The advantages of using this invention are: 1. This invention features a piston chamber on the main shaft, within which an extension rod and piston plate are fixed as a single unit by a connecting rod, and the extension rod is fixedly connected to the retrieval head. Since both the extension rod and piston plate are movably positioned within the piston chamber, the retrieval head also becomes a piston-like structure capable of vertical movement. Specifically, in practical applications, this retrieval head can, on the one hand, remain close to the top of the main shaft during normal operation of the pulse generator, thereby reducing the mutual influence between the retrieval head and the flowing mud and ensuring the accuracy of information transmission; on the other hand, it can automatically move upwards to facilitate docking with retrieval equipment when the pulse generator is lost and retrieval is required, ensuring the reliability of the retrieval.

[0019] 2. This invention controls the pressure difference between the inside and outside of the piston chamber by controlling the on / off state of the solenoid valve, thereby achieving motion control and positioning control of the piston plate, connecting rod, extension rod, and retrieval head. It not only has the advantages of simple structure, easy control, high accuracy, and good stability.

[0020] 3. This invention can detect whether the pulse generator has been lost by using a loss detection module, pressure sensor one, and pressure sensor two. By using a retrieval auxiliary module in conjunction with a solenoid valve, it can control the retrieval head to move up and detach from the main shaft for easy retrieval. It has the advantages of accurate detection and convenient and timely retrieval.

[0021] 4. This invention can emit a salvage reminder sound through a bone conduction sensor and transmit it through vibration to the salvage personnel on the ground, reminding them that the pulse generator has completed the salvage docking and is in the process of continuous salvage, which helps to ensure the accuracy, stability and reliability of the salvage.

[0022] 5. The present invention uses an auxiliary electromagnet to facilitate the quick and accurate docking and snapping of the retrieval head with the retrieval equipment.

[0023] 6. The present invention uses an inductive sensor to improve the accuracy of salvage and docking.

[0024] 7. The present invention uses an embedded method to realize the pressure sensor and the pressure sensor, which is beneficial to realize accurate pressure detection and can also protect the pressure sensor and prevent damage.

[0025] 8. The present invention has several vent holes through the piston plate. The vent holes help to achieve pressure balance above and below the piston plate, thereby smoothly controlling the upward movement of the extension rod. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention connected to the conveying pipeline; Figure 2 This is a three-dimensional structural diagram of the retrieval head attached to the upper end of the main shaft in this invention; Figure 3 This is a schematic diagram of the structure in this invention where the retrieval head detaches upward from the main shaft; Figure 4 This is a schematic diagram of the internal structure of the generator housing in this invention; Figure 5 This is a partial cross-sectional view of the generator housing in this invention; Figure 6 for Figure 2 Partial axial section view; Figure 7 for Figure 3 Partial axial section view; Figure 8 This is a system structure block diagram of the intelligent salvage controller in this invention.

[0027] Explanation of the labels in the diagram: 1. Generator housing; 2. Delivery pipe; 3. Main shaft; 4. Retrieval head; 5. Pressure sensor one; 6. Extension rod; 7. Pressure sensor two; 8. Valve body housing; 9. Motor rotor; 10. Motor stator; 11. Intelligent retrieval controller; 12. Air pressure balance hole; 13. Solenoid valve; 14. Piston chamber; 15. Piston plate; 16. Connecting rod; 17. Bone conduction sensor; 18. Distance sensor; 19. Auxiliary electromagnet; 20. Inductive sensor. Detailed Implementation

[0028] Example 1 like Figure 1-7 As shown, this embodiment provides a continuous wave mud pressure pulse generator, including an intelligent fishing controller 11, a fishing head 4, a generator housing 1, a pulse generator valve installed inside the generator housing 1, and an actuator. The upper end of the generator housing 1 is fixed to the delivery pipeline 2, and the lower end of the generator housing 1 is fixed to the drilling assembly, facilitating the installation of the generator housing 1. The actuator is electrically connected to the pulse generator valve and is used to drive the pulse generator valve to operate. like Figure 2-7As shown, the pulse generator valve includes a valve body shell 8 fixed inside the generator housing 1. The valve body shell 8 has a hollow structure and is threadedly fixed to the upper part of the generator housing 1. Inside the valve body shell 8 are a motor rotor 9 and a motor stator 10. The motor rotor 9 is fixed to the lower part of the inner wall of the valve body shell 8. The upper part of the motor rotor 9 is rotatably mounted on the motor stator 10. Both the motor rotor 9 and the motor stator 10 have flow holes. By driving the motor rotor 9 to rotate through an actuator, the overlapping area of ​​the flow holes between the motor rotor 9 and the motor stator 10 can be changed, thereby changing the flow area of ​​the drilling mud in the drill bit. This generates continuous pressure pulsations inside the drill bit. These pressure pulsations carry coded data information. The drilling mud carrying the data information is transmitted through pipelines and then processed by the surface processing system to achieve data acquisition within the mine. The executing mechanism is a publicly known conventional technical means known to those skilled in the art, and is considered prior art. Its specific working principle and structure are well known to those skilled in the art and are not within the scope of protection of the technical solution of this application. The specific working principle and structure of the executing mechanism will not be described in detail in the technical solution of this application.

[0029] Furthermore, a vertical main shaft 3 is provided along the axis of the valve body housing 8. The main shaft 3 is fixed in the middle of the motor stator 10. The lower end of the main shaft 3 extends downward through the valve body housing 8 and is fixedly connected to the intelligent retrieval controller 11. The upper end of the main shaft 3 moves upward through the motor rotor 9 and extends out of the valve body housing 8 and is movably connected to the retrieval head 4.

[0030] like Figure 6-7 As shown, the main shaft 3 has an open-top piston chamber 14. The bottom of the piston chamber 14 is close to the lower end of the main shaft 3. A movable extension rod 6 and a piston plate 15 are respectively installed inside the piston chamber 14. The lower end of the extension rod 6 is fixedly connected to the piston plate 15 as a whole via a connecting rod 16. The upper end of the extension rod 6 is fixedly connected to the retrieval head 4, and after fixing, the retrieval head 4 fits against the upper end of the main shaft 3 without external force. In addition, a pressure balance hole 12 is also provided on the main shaft 3 at a position corresponding to the bottom of the piston chamber 14. This pressure balance hole 12 is used to connect the piston chamber 14 with the inner cavity of the generator housing 1. A solenoid valve 13 is also installed in the pressure balance hole 12, which can control the opening and closing of the connection between the piston chamber 14 and the inner cavity of the generator housing 1.

[0031] like Figure 2 , 4 As shown in Figures 5 and 6, when the pulse generator is running normally, the retrieval head 4 is close to the top of the main shaft 3, which makes the main shaft 3 and the retrieval head 4 more integrated, reducing the impact on the flow of mud that transmits information and ensuring the accuracy of information transmission.

[0032] like Figure 3 , 7As shown, when the pulse generator is lost and needs to be retrieved, the piston chamber 14 can be connected to the inner cavity of the generator housing 1 by controlling the solenoid valve 13. The pressure difference between the inside and outside of the piston chamber 14 pushes the piston plate 15 upward, which in turn drives the extension rod 6 to move the retrieval head 4 upward and separate it from the top of the main shaft 3. At this time, the retrieval head 4 can be clamped and fixed by the retrieval equipment to retrieve the lost pulse generator.

[0033] With the above design, when the pulse generator is in normal use, the solenoid valve 13 controls the air pressure balance hole 12 to close. At this time, the piston chamber 14 is not connected to the external mud environment. The sealed space of the piston chamber 14 can fix the piston plate 15, and the retrieval head 4 is close to the top of the main shaft 3, without affecting the accurate transmission of information. Since the equipment is located at a low position in the mine, the external pressure of the main shaft 3 is higher than the internal pressure of the piston chamber 14. When the pulse generator is lost, the air pressure balance hole 12 can be gradually opened by controlling the solenoid valve 13. At this time, the piston chamber 14 is gradually connected to the external environment. Due to the pressure difference between the piston chamber 14 and the outside environment, the piston plate 15 gradually moves upward, thereby pushing the extension rod 6 upward through the connecting rod 16 above, and then pushing the retrieval head 4 to disengage from the main shaft 3 and move upward to a set position, so as to facilitate locking and fixing with the retrieval equipment.

[0034] like Figure 4-8 As shown, the intelligent salvage controller 11 includes a protective housing, a loss detection module, a salvage auxiliary module, a power supply module, a distance sensor 18, a pressure sensor 5, and a pressure sensor 7. The protective housing is fixed to the lower end of the main shaft 3, and the loss detection module, salvage auxiliary module, and power supply module are all installed inside the protective housing. The distance sensor 18 is installed at the bottom of the piston plate 15 and faces the bottom of the piston chamber 14, and is used to collect distance data between the piston plate 15 and the bottom of the piston chamber 14. The pressure sensor 5 and the pressure sensor 7 are respectively embedded and fixed on the outer and inner walls of the generator housing 1, and are used to collect pressure data outside the generator housing 1 and pressure data inside the generator housing 1, respectively. Since the generator housing 1 is used to transport mud to the ground at a higher elevation, there is a pressure difference between the inside and outside of the generator housing 1.

[0035] The power supply module is electrically connected to both the loss detection module and the retrieval assistance module. The power supply module includes a battery pack and a power management module, which are electrically connected. The power management module is also electrically connected to both the loss detection module and the retrieval assistance module. The retrieval assistance module is electrically connected to the loss detection module, solenoid valve 13, and distance sensor 18. The loss detection module is connected to pressure sensor 5 and pressure sensor 7. The loss detection module can detect whether the pulse generator has been lost by measuring the pressure difference collected by pressure sensor 5 and pressure sensor 7. Furthermore, when the loss of the pulse generator is detected, the retrieval assistance module can control the retrieval head 4 to move upwards and detach from the main shaft 3 via solenoid valve 13.

[0036] Those skilled in the art will understand that the battery pack can supply power to different modules through the power management module. Before the pulse generator is lost, the power management module only supplies power to the loss detection module. After the loss detection module detects the loss signal through pressure sensor 5 and pressure sensor 7, it sends a power supply signal to the power management module. Upon receiving the power supply signal, the power management module then supplies power to the salvage assistance module, enabling it to perform normal salvage assistance work. This allows for the management of the battery pack's power usage, saving energy.

[0037] According to a preferred embodiment of this invention, the retrieval head 4 is mushroom-shaped, with a maximum diameter greater than that of the extension rod 6 and a maximum diameter less than or equal to that of the main shaft 3. This allows the retrieval head 4 to form a streamlined structure with the main shaft 3 when it is in contact with the top of the main shaft 3, further reducing the impact on mud flow.

[0038] According to a preferred embodiment of this invention, the piston cavity 14 is a cylindrical structure, the piston plate 15 is a disc-shaped structure adapted to the piston cavity 14, and the extension rod 6 is a cylindrical structure adapted to the piston cavity 14. The piston plate 15 and the extension rod 6 have the same outer diameter, and both the outer diameters of the piston plate 15 and the extension rod 6 are larger than the outer diameter of the connecting rod 16. This ensures that the extension rod 6 can stably and reliably control the upward movement of the retrieval head 4.

[0039] Furthermore, several vent holes are provided through the piston plate 15. By providing vent holes on the piston plate 15, the pressure at the upper and lower ends of the piston plate 15 can be balanced, and the upward movement of the extension rod 6 can be smoothly controlled during the upward movement of the piston plate 15.

[0040] The implementation principle of this embodiment is as follows: When the pulse generator is working normally, pressure sensor 5 collects pressure data from the outside of the generator housing 1, and pressure sensor 7 collects pressure data from the inside of the generator housing 1. The collected pressure data is then transmitted to the loss detection module. At this time, the loss detection module detects a pressure difference that meets the set parameters and determines that the pulse generator is working normally. When the delivery pipe 2 breaks from the pulse generator, the loss detection module receives data from pressure sensors 5 and 7 showing the same pressure or a small pressure difference (less than the preset pressure difference range within the loss detection module). It then determines that the pulse generator is in a lost state. At this time, the loss detection module sends a loss signal to the retrieval assistance module. Upon receiving the loss signal, the retrieval assistance module controls the solenoid valve 13 to open the air pressure balance hole 12. At this time, the piston chamber 14 and the external air pressure gradually equalize. Under the action of pressure, the piston plate 15 moves upward and controls the extension rod 6 to lift the retrieval head 4. During this process, the distance sensor 18 installed on the piston plate 15 sends the distance data between the piston plate 15 and the bottom of the piston cavity 14 to the retrieval assistance module in real time. When the distance data gradually increases and becomes the same as the preset distance data in the retrieval assistance module, the retrieval assistance module sends a closing signal to the solenoid valve 13, so that the inner cavity of the piston cavity 14 forms a sealed space again. At this time, the piston plate 15 can remain stable in the inner cavity of the piston cavity 14, and together with the top extension rod 6 and the retrieval head 4, it can remain stable. Therefore, when the retrieval head 4 is clamped and fixed by the retrieval equipment and gradually lifted, the retrieval head 4 can be stably connected to the pulse generator by the adsorption effect of the piston cavity 14, which makes it easy to stably lift and retrieve the pulse generator by the retrieval equipment.

[0041] Example 2 Based on Example 1, this example further optimizes the intelligent salvage controller 11.

[0042] like Figure 5-8 As shown, the intelligent salvage controller 11 also includes a bone conduction sensor 17, which is installed at the bottom of the piston chamber 14 and electrically connected to the salvage auxiliary module. Under the control of the salvage auxiliary module, the bone conduction sensor 17 can emit a salvage reminder sound.

[0043] While the loss detection module sends a loss signal to the salvage assistance module, the salvage assistance module sends an operation signal to the bone conduction sensor 17. The bone conduction sensor 17 continuously emits a reminder sound and transmits it through vibration. The sound is transmitted to the salvage personnel on the ground through solid components such as the main shaft 3, salvage head 4, and salvage equipment, reminding the salvage personnel that the pulse generator salvage docking is complete and that the salvage is in progress, thus ensuring the smooth progress of the salvage.

[0044] Example 3 Based on Example 1 or Example 2, this example further optimizes the intelligent salvage controller 11.

[0045] like Figure 6-8 As shown, the intelligent salvage controller 11 also includes an auxiliary electromagnet 19 and an inductive sensor 20. The auxiliary electromagnet 19 is embedded in the upper middle part of the salvage head 4 and is electrically connected to the salvage auxiliary module. The inductive sensor 20 is fixed on one side of the upper middle part of the salvage head 4 and is electrically connected to the salvage auxiliary module.

[0046] For the auxiliary electromagnet 19, during the retrieval process, the parts of the retrieval equipment that are engaged with the retrieval head 4 will gradually approach the retrieval head 4. At the same time as the loss detection module sends a loss signal to the retrieval auxiliary module, the retrieval auxiliary module sends an operation signal to the auxiliary electromagnet 19. The auxiliary electromagnet 19 forms a magnetic field above the retrieval head 4. When the parts of the retrieval equipment that are engaged with the retrieval head 4 approach the retrieval head 4, they will be attracted by the auxiliary electromagnet 19 and approach the retrieval head 4 to complete the docking. Thus, it is possible to achieve a fast and accurate docking operation between the retrieval equipment and the retrieval head 4 at the bottom of the mine where the lighting environment is poor and remote docking is inconvenient.

[0047] For the inductive sensor 20, it can detect the distance between the top retrieval device and the retrieval head 4. Simultaneously, while the loss detection module sends a loss signal to the retrieval assistance module, the retrieval assistance module sends a detection signal to the inductive sensor 20. The inductive sensor 20 detects the distance to the retrieval device located at the top and sends the distance data to the retrieval assistance module in real time. As the retrieval device gradually approaches the retrieval head 4, the retrieval assistance module receives the real-time distance data sent by the inductive sensor 20 and compares it with its internally preset distance data. When the distance... When the distance reaches the preset range, the salvage auxiliary module sends a stop signal to the inductive sensor 20 and a start signal to the auxiliary electromagnet 19. At this time, the auxiliary electromagnet 19 can form a magnetic field above the salvage head 4. When the parts of the salvage equipment that are connected to the salvage head 4 approach the salvage head 4, they will be attracted by the auxiliary electromagnet 19 and approach the salvage head 4 to complete the docking. This allows the auxiliary electromagnet 19 to work when the salvage equipment approaches the salvage head 4, saving the power of the power supply module and preventing the power in the power supply module from being exhausted before the salvage is completed.

[0048] The above description is merely a specific embodiment of the present invention. Any feature disclosed in this specification may be replaced by other equivalent or similar features unless otherwise specified. All features or steps in the disclosed methods or processes may be combined in any way, except for mutually exclusive features and / or steps.

Claims

1. A continuous wave mud pressure pulse generator, comprising a generator housing (1), a pulse generator valve and an actuator installed within the generator housing (1), wherein the actuator is electrically connected to the pulse generator valve and is used to drive the pulse generator valve to operate; characterized in that: It also includes an intelligent salvage controller (11) and a salvage head (4), wherein, The pulse generator valve includes a valve body shell (8) fixed inside the generator housing (1). The valve body shell (8) is provided with a motor rotor (9) and a motor stator (10) from top to bottom. A main shaft (3) is fixed in the middle of the motor stator (10). The lower end of the main shaft (3) extends downward through the valve body shell (8) and is fixedly connected to the intelligent salvage controller (11). The upper end of the main shaft (3) moves upward through the motor rotor (9) and extends out of the valve body shell (8) and is movably connected to the salvage head (4). The main shaft (3) has an open-top piston chamber (14). The piston chamber (14) is equipped with a movable extension rod (6) and a piston plate (15). The lower end of the extension rod (6) is fixedly connected to the piston plate (15) through a connecting rod (16). The upper end of the extension rod (6) is fixedly connected to the retrieval head (4). After fixing, the retrieval head (4) fits against the upper end of the main shaft (3). A pressure balance hole (12) is opened on the main shaft (3) at the position corresponding to the bottom of the piston chamber (14) and communicates with the piston chamber (14). A solenoid valve (13) is installed in the pressure balance hole (12). The intelligent salvage controller (11) includes a loss detection module, a salvage auxiliary module, a power supply module, a distance sensor (18), a pressure sensor one (5), and a pressure sensor two (7). The distance sensor (18) is installed at the bottom of the piston plate (15) and faces the bottom of the piston chamber (14). The pressure sensor one (5) and the pressure sensor two (7) are fixed on the outer wall and inner wall of the generator housing (1), respectively. The power supply module is electrically connected to the loss detection module and the salvage auxiliary module, respectively. The salvage auxiliary module is electrically connected to the loss detection module, the solenoid valve (13), and the distance sensor (18), respectively. The loss detection module is connected to the pressure sensor one (5) and the pressure sensor two (7), respectively. The loss detection module can detect whether the pulse generator has been lost through the pressure sensor one (5) and the pressure sensor two (7). When the pulse generator is lost, the salvage auxiliary module can control the salvage head (4) to move upward and separate from the main shaft (3) through the solenoid valve (13).

2. The continuous wave mud pressure pulse generator according to claim 1, characterized in that: The intelligent salvage controller (11) also includes a bone conduction sensor (17), which is installed at the bottom of the piston chamber (14) and electrically connected to the salvage auxiliary module.

3. A continuous wave mud pressure pulse generator according to claim 2, characterized in that: The intelligent salvage controller (11) also includes an auxiliary electromagnet (19), which is embedded in the upper middle part of the salvage head (4) and electrically connected to the salvage auxiliary module.

4. A continuous wave mud pressure pulse generator according to claim 3, characterized in that: The intelligent salvage controller (11) also includes an inductive sensor (20), which is fixed to one side of the upper middle part of the salvage head (4) and electrically connected to the salvage auxiliary module.

5. A continuous wave mud pressure pulse generator according to any one of claims 1-4, characterized in that: The power supply module includes a battery assembly and a power management module, which are electrically connected. The power management module is electrically connected to the loss detection module and the salvage assistance module, respectively.

6. A continuous wave mud pressure pulse generator according to claim 1, characterized in that: The pressure sensor one (5) and pressure sensor two (7) are respectively embedded on the outer wall and inner wall of the generator housing (1).

7. A continuous wave mud pressure pulse generator according to claim 1, characterized in that: The piston plate (15) has several ventilation holes.

8. A continuous wave mud pressure pulse generator according to claim 1, characterized in that: The piston cavity (14) is a cylindrical structure, the piston plate (15) is a disc-shaped structure adapted to the piston cavity (14), and the extension rod (6) is a cylindrical structure adapted to the piston cavity (14).

9. A continuous wave mud pressure pulse generator according to claim 8, characterized in that: The piston plate (15) and the extension rod (6) have the same outer diameter, and the outer diameters of the piston plate (15) and the extension rod (6) are both greater than the outer diameter of the connecting rod (16).

10. A continuous wave mud pressure pulse generator according to claim 1, characterized in that: The retrieval head (4) is mushroom-shaped. The maximum diameter of the retrieval head (4) is greater than the diameter of the extension rod (6), and the maximum diameter of the retrieval head (4) is less than or equal to the diameter of the main shaft (3).

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