High-speed pulse generating device

Abstract

The invention relates to the technical field of oil exploitation, in particular to a high-speed pulse generating device, which is characterized in that a valve rod is pushed by a driver and is respectively matched with two valve seats to control drilling fluid to enter or flow out of a main control cavity; the valve rod comprises a plug, a first matching part, a second matching part and a sealing part which are integrally arranged, and the plug and the sealing part are respectively matched with one valve seat in a sealing manner; the first matching part is matched with the valve seat and kept for T1 time, and the main piston moves from the first position to the second position; the second matching part is matched with the valve seat and kept for T1 time, and the main piston moves to the position between the first position and the second position from the first position; and the driver loosens the valve rod, the plug closes one valve seat, the sealing part opens the other valve seat and keeps for T2 time, and the main piston moves to the first position and stops. The impact device has the effect of reducing the influence of sundries on normal work of the impact device.

Description

Technical Field

[0001] The present invention relates to the technical field of oil production, and in particular to a high-rate pulse generating device. Background Art

[0002] With the booming oil industry both domestically and internationally, wireless measurement-while-drilling (MWD) inclinometers have experienced rapid development and upgrades. The pulse generator, a crucial component of wireless MWD systems, primarily transmits signals through mud pressure waves. Typically mounted on the drill pipe and moving with the drill bit, the pulse generator transmits signals through the mud to the surface. A decoding system on the surface detects pressure fluctuations and decodes them, transmitting the measured data to the surface. This data includes drill bit direction and drilling fluid circulation status.

[0003] The related technology discloses a drilling fluid pulse signal generator, which includes an outer shell and an inner core arranged inside the outer shell, a cavity is provided inside the inner core, and a rotor shaft and a stator coil are concentrically provided inside the cavity. A turbine is provided on the axial outside of the first end of the inner core, and the turbine is fixedly connected to the rotor shaft. A valve disc mechanism is provided axially between the inner core and the turbine. The valve disc mechanism includes a stator disc and a rotor disc. The rotor disc is driven to rotate by the turbine, and the flow area of the valve disc mechanism changes periodically. A pressure acquisition device is provided at the wellhead. The turbine can drive the rotor disc to rotate under the push of the drilling fluid, so that the drilling fluid flowing through the valve disc mechanism generates periodic pressure pulses. The stator coil can control the rotation speed of the rotor shaft by powering on and off to control the frequency of the pressure pulse signal, and the signal frequency is collected and analyzed by the pressure acquisition device, thereby completing the transmission of downhole measurement information.

[0004] However, the drilling fluid inevitably contains rock cuttings or other debris particles, which may get stuck between the rotor disk and the stator disk, causing the rotor disk to be unable to rotate. This makes the pulser unable to work normally, and the only option is to increase the flow rate of the drilling fluid to flush the rotor disk. If it cannot be flushed open, the pulser needs to be removed for cleaning, which affects the drilling efficiency. Summary of the Invention

[0005] The present invention provides a high-rate pulse generating device, which aims to reduce the problem in the related art that debris in drilling fluid affects the normal operation of the pulse device.

[0006] A high-rate pulse generating device of the present invention includes a shell, in which a main piston and a drive assembly for controlling the movement of the main piston are arranged. The position of the main piston corresponding to the shell is the throat, and the main piston moves along the shell to control the flow of drilling fluid in the throat toward the main piston. When the main piston moves to the first position, the pressure of the drilling fluid is normal. When the main piston moves to the second position, the main piston blocks the throat and the pressure of the drilling fluid increases. The drive assembly includes a control valve and a driver for driving the control valve. The control valve includes a valve body, a valve stem and two valve seats arranged at intervals. The valve stem is arranged in the valve body. The valve body cooperates with the main piston to form a main control chamber. The valve stem is pushed by the driver and cooperates with the two valve seats to control the entry or outflow of drilling fluid. Main control chamber; the valve stem includes an integrally arranged plug, a first matching part, a second matching part and a sealing part, the first matching part and the second matching part can both match with the same valve seat under the action of the driver, and the plug and the sealing part respectively seal and match with one valve seat; the driver pushes the valve stem to move, the plug opens one valve seat, the sealing part closes the other valve seat, the first matching part matches with the valve seat and maintains for T1 time, the main piston moves from the first position to the second position; the second matching part matches with the valve seat and maintains for T1 time, the main piston moves from the first position to the middle of the first position and the second position; the driver releases the valve stem, the plug closes one valve seat, the sealing part opens the other valve seat and maintains for T2 time, and the main piston moves to the first position and stops.

[0007] The effect is that the position of the main piston relative to the housing forms a throat. When the main piston moves to the second position, the drilling fluid pressure above the throat increases. Because the main control chamber drives the main piston through the entry of drilling fluid, even a small amount of debris in the throat will still cause a significant pressure increase due to the reduced flow rate. When the throat is opened by the main piston, the drilling fluid flow rate at the throat is high, and the drilling fluid pressure above the throat does not increase. This structure reduces the impact of debris on the normal operation of the pulse device.

[0008] At the same time, the actuator pushes the valve stem, causing the plug to open a valve seat. Drilling fluid then flows into the main control chamber through the gap between the first fitting and the valve seat. Due to the high drilling fluid flow rate, the main piston can reach the second position within time T1, causing the drilling fluid to form the largest pressure peak. However, the gap between the second fitting and the valve seat is small, and the flow rate into the main control chamber is small. Therefore, the main piston cannot reach the second position within time T1, resulting in only a smaller pressure peak. Within time T2, the main piston moves to the first position and stops, forming a trough in the drilling fluid pressure fluctuation. Since troughs occur during each action, pulse signals can be transmitted using the peak value of the pressure fluctuation, and the completion of each action can be determined by the time the trough occurs. This provides a precise end signal, allowing the next signal to be transmitted promptly after the end signal, improving transmission speed while ensuring accuracy.

[0009] Preferably, a core shaft is provided at the center of the shell, and the core shaft includes a main body and a limiting ring. The main piston slides with the outer wall of the main body through a sliding bearing. The limiting ring is fixed on the main body. When the limiting ring abuts against the sliding bearing, the main piston is in the second position. A shoulder is provided on the main body. When the limiting ring abuts against the shoulder, the main piston is in the first position.

[0010] The effect is that the sliding bearing is arranged on the main piston and is located between the shoulder and the limit ring. Such a design can accurately limit the position of the main piston, thereby ensuring the accuracy of the pressure wave signal.

[0011] Preferably, a lower bearing is provided on the outer wall of the valve body, and the main piston is sealed with the valve body through the lower bearing. One end of the valve body connected to the main piston is fixed to the main body and communicated with the interior of the main body. An end of the main body away from the valve body is connected to a screen pipe, and a through hole for entering the drilling fluid into the interior of the main body is opened on the side wall of the screen pipe, and the through hole is covered with a sand net.

[0012] The effect is that the side wall of the screen is covered with a sand net, which can effectively prevent debris in the drilling fluid from entering the main control chamber, thereby reducing the wear of the lower bearing by the debris and extending the service life of the lower bearing.

[0013] Preferably, the valve body is provided with a channel connected to the main control chamber, the channel is located between the two valve seats at one end away from the main control chamber, and the drilling fluid enters the channel through the cooperation between the valve stem and the valve seat, or the drilling fluid in the channel is discharged from the valve body through the cooperation between the valve stem and the other valve seat.

[0014] Preferably, a connecting pipe is installed on the valve body, which is connected to the end of the valve body away from the main body. A long groove and an inclined hole are opened on the side wall of the connecting pipe. The outer side of the long groove is covered with a filter element, and the inclined hole gradually tilts toward the outer side of the connecting pipe along the flow direction of the drilling fluid.

[0015] The effect is that the long groove on the connecting pipe is the main outflow location of the drilling fluid in the main control chamber. The filter can prevent debris in the external drilling fluid from entering the connecting pipe, while the inclined hole can discharge the debris that cannot pass through the filter out of the connecting pipe.

[0016] Preferably, the driver includes a housing, a main solenoid valve and an auxiliary solenoid valve, the housing is fixedly connected to the valve body, the main solenoid valve is fixed in the housing, the auxiliary solenoid valve is fixed on the inner rod of the main solenoid valve, the auxiliary solenoid valve is slidingly arranged in the housing, and a push rod is fixedly arranged at the movable end of the auxiliary solenoid valve, the push rod is used to push the valve stem to move, the main solenoid valve and the auxiliary solenoid valve are energized at the same time, the valve stem moves to the second mating part to cooperate with the valve seat, the main solenoid valve is energized alone, and the valve stem moves to the first mating part to cooperate with the valve seat.

[0017] Preferably, a permanent magnet is fixed on the inner rod of the main solenoid valve, and a Hall switch is fixed in the shell. The permanent magnet judges the working state of the main solenoid valve through the Hall switch as the inner rod moves, so that the main solenoid valve maintains the current state for T1 or T2 time.

[0018] Preferably, a rubber cup is installed on the push rod, which is fixed between the shell and the push rod and is used to seal the connection position between the push rod and the shell. The middle part of the rubber cup is deformed to adapt to the movement of the push rod relative to the shell.

[0019] The effect is that as the inner rod moves, the permanent magnet moves closer to or further away from the Hall effect switch. The Hall effect of the Hall effect switch can be used to determine the operating status of the main solenoid valve, thereby accurately controlling the T1 and T2 times of the main solenoid valve operation.

[0020] Preferably, a filter screen is provided inside the valve body, the filter screen is located between the two valve seats, and the filter screen is used to filter the drilling fluid flowing into the main control chamber.

[0021] Preferably, the outer shell includes a mounting ring seat and a flow limiting ring, the inner wall of the flow limiting ring gradually shrinks toward the center along the flow direction of the drilling fluid to form the throat, the mounting ring seat is used to fix the flow limiting ring and the core shaft, and the core shaft is set in the center of the flow limiting ring through the centering frame.

[0022] By adopting the above technical solution, the beneficial effects of the present invention are: The present invention drives the main piston to move by the entry of drilling fluid through the main control chamber. Therefore, even if there is a small amount of debris at the throat position, the drilling fluid will still produce a large pressure increase due to the reduced flow rate. When the throat is opened by the main piston, the drilling fluid flow at the throat is large, and the drilling fluid pressure above the throat will not increase. Such a structure can reduce the impact of debris on the normal operation of the pulse device. A trough can be generated in each action, so the pulse signal can be transmitted by the peak value of the pressure fluctuation, and the completion of each action can be determined by the time when the trough appears. In this way, the pulse signal has an accurate end signal, and the next signal can be transmitted in time after the end signal, which improves the transmission rate while ensuring accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a cross-sectional view of the overall structure of a high-rate pulse generating device of the present invention; Figure 2 is a schematic diagram of the position of a control valve in an embodiment of the present invention; Figure 3 yes Figure 1 A partial enlarged view of part A; Figure 4 This is a diagram of the connection structure of the takeover in an embodiment of the present invention; Figure 5 yes Figure 1 A partial enlarged view of part B.

[0024] Reference numerals: 1. Housing; 11. Gland; 12. Mounting ring seat; 13. Limiting ring; 14. Throat; 15. Centering frame; 2. Main piston; 21. Sliding bearing; 31. Body; 32. Screen tube; 321. Through hole; 33. Limiting ring; 34. Shoulder; 35. Sand net; 4. Fishing spear; 5. Control valve; 51. Valve body; 511. Passageway; 52. Valve stem; 521. First mating portion; 522. Second mating portion; 523. Plug; 524. Sealing part; 53. Valve seat; 54. Lower bearing; 55. Guide sleeve; 56. Return spring; 57. Base; 58. Filter; 6. Driver; 61. Housing; 611. Upper housing; 612. Lower housing; 62. Main solenoid valve; 63. Auxiliary solenoid valve; 64. Push rod; 65. Rubber cup; 7. Main control chamber; 8. Connecting pipe; 81. Long groove; 82. Inclined hole; 83. Filter element; 9. Permanent magnet; 91. Hall switch. DETAILED DESCRIPTION

[0025] The following combination Figures 1 to 5 The embodiments of the present invention are described in detail, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0026] This embodiment discloses a high-rate pulse generating device, such as Figure 1 and Figure 2 As shown, it includes a housing 1, which is a cylindrical structure. The drilling fluid is pumped from the upper end of the housing 1 to the lower end of the housing 1, so that the drilling fluid flows downward to the position of the drill bit. A main piston 2 is provided at the center of the housing 1. The main piston 2 is used to control the flow rate of the drilling fluid in the housing 1. When the main piston 2 prevents the flow of the drilling fluid, the pressure of the drilling fluid can be increased. When the main piston 2 restores the flow of the drilling fluid, the pressure of the drilling fluid returns to normal, thereby enabling the pressure of the drilling fluid to change. A core shaft fixed to the housing 1 is provided at the center of the main piston 2. The center line of the core shaft coincides with the center line of the housing 1. A drive assembly for controlling the movement of the main piston 2 is installed on the core shaft.

[0027] refer to Figure 1 、 Figure 2 and Figure 3The housing 1 includes a gland 11, a mounting ring seat 12, and a flow restrictor ring 13. The mounting ring seat 12, gland 11, and flow restrictor ring 13 are all cylindrical structures. The upper end of the mounting ring seat 12 is threadedly connected to the gland 11. The flow restrictor ring 13 is placed within the mounting ring seat 12 and then secured by the gland 11. The inner wall of the mounting ring seat 12 contracts inward to form a tapered mounting position, or a stepped mounting position, so that one end of the flow restrictor ring 13 can be inserted into and abut against the mounting position. The end of the gland 11 then presses against the end of the flow restrictor ring 13, so that the gland 11 and the mounting position cooperate to clamp the flow restrictor ring 13. The inner wall of the flow restrictor ring 13 gradually contracts toward the center along the flow direction of the drilling fluid, forming a throat 14. The gap between the throat 14 and the outer wall of the core shaft is used for the flow of drilling fluid. The main piston 2 can move upward from below the throat 14, entering the gap between the throat 14 and the core shaft, thereby changing the drilling fluid pressure above the throat 14. This change can be detected by a surface data acquisition system, which can then decode the information. The diameter of the end of the main piston 2 that can enter the throat 14 is smaller than the inner diameter of the throat 14. This increases the drilling fluid pressure by reducing the flow rate at the throat 14. The greater the flow rate reduction, the greater the increase in drilling fluid pressure above the throat 14, and vice versa. The position of the main piston 2 away from the throat 14 is the first position. In this first position, the main piston 2 does not cooperate with the flow restriction ring 13 to limit flow, and the drilling fluid is at normal pressure. The position of the main piston 2 within the throat 14 is the second position. In this second position, the main piston 2 cooperates with the flow restriction ring 13 to limit flow, achieving the maximum drilling fluid pressure above the throat 14. The time it takes for the drive assembly to move the main piston 2 from the first position to the second position is T1.

[0028] refer to Figure 1 、 Figure 2 and Figure 3The core shaft comprises a body 31, a screen 32, and a retaining ring 33. The body 31 is sheathed with an annular sliding bearing 21. The main piston 2 is mounted on the outer wall of the sliding bearing 21, allowing the main piston 2 to slide in contact with the body 31 through the sliding bearing 21. The body 31 is hollow and connected to the screen 32 at one end. The screen 32 is fixedly connected to the housing 1 inside the gland 11 via a centering frame 15. A space is left between the outer wall of the screen 32 and the inner wall of the gland 11 for drilling fluid flow. A salvage spear 4 is mounted on the end of the screen 32 facing away from the body 31. A retaining ring 33 is fixed to the side wall of the body 31 and positioned above the throat 14. It abuts the sliding bearing 21, causing the main piston 2 to stop when it moves to the second position. A shoulder 34 is provided on the body 31, which abuts the sliding bearing 21. When the sliding bearing 21 abuts the shoulder 34, the main piston 2 moves to the first position. The limit ring 33 and shoulder 34 restrict the range of movement of the main piston 2, ensuring its proper position and accurately establishing the maximum and minimum pressure values of the pulse. When the main piston 2 is in the second position, the drilling fluid pressure is at its maximum; when the main piston 2 is in the first position, the drilling fluid pressure is at its minimum.

[0029] The sidewall of the screen tube 32, where the salvage spear 4 is mounted, is provided with a through-hole 321 that communicates with the interior of the screen tube 32. Multiple through-holes 321 are arranged. A sand screen 35 is also installed on the outer wall of the screen tube 32. The sand screen 35 covers the perimeter of the screen tube 32 and blocks the through-holes 321, filtering the drilling fluid entering the screen tube 32. Drilling fluid entering the screen tube 32 is only used to drive the drive assembly and is not a primary flow path for the drilling fluid. Therefore, relatively little drilling fluid passes through the sand screen 35. The sand screen 35 also prevents debris from entering the screen tube 32.

[0030] refer to Figure 1 、 Figure 2 and Figure 4The drive assembly includes a control valve 5 and a driver 6 for driving the control valve 5. The control valve 5 includes a valve body 51, a valve stem 52 and a valve seat 53. The valve body 51 is a cylindrical structure. One end of the valve body 51 is connected to the main body 31 and is in communication with the interior of the main body 31. At the same time, the end of the main piston 2 close to the valve body 51 is sleeved on the valve body 51, and a lower bearing 54 is provided on the outer wall of the valve body 51. The lower bearing 54 is used to seal between the main piston 2 and the valve body 51. The interior of the main piston 2 forms a main control chamber 7 through the connection with the valve body 51. The main control chamber 7 is in communication with the interior of the main body 31 through the control valve 5. When the control valve 5 is opened to connect the main control chamber 7 with the main body 31, drilling fluid will enter the main control chamber 7. The pressure of the drilling fluid pushes the main piston 2 upward, causing the main piston 2 to move to the second position. When the control valve 5 is closed, the drilling fluid is prevented from entering the main control chamber 7, and the drilling fluid flows out of the main control chamber 7. The main piston 2 is pushed by the drilling fluid outside the body 31 to move downward and stop at the first position.

[0031] refer to Figure 2 Two valve seats 53 are provided, spaced apart one above the other. Both valve seats 53 are fixed to the valve body 51. A channel 511 is defined in the valve body 51. One end of the channel 511 communicates with the main control chamber 7, and the other end communicates with the position between the two valve seats 53. A guide sleeve 55 is fixed to each valve seat 53. The guide sleeve 55 has an opening that allows drilling fluid to pass through the valve seats 53. The valve stem 52 extends through the guide sleeve 55 and is slidably connected to the guide sleeve 55. The guide sleeve 55 ensures that the movement direction of the valve stem 52 coincides with the centerline of the valve body 51. The valve stem 52 is provided with a first mating portion 521, a second mating portion 522, and a plug 523 at the upper valve seat 53. A sealing portion 524 is provided at the lower valve seat 53. The plug 523, first mating portion 521, and second mating portion 522 are arranged in this order from top to bottom. The diameter of the first mating portion 521 is smaller than that of the second mating portion 522, which is also smaller than the diameter of the center hole of the upper valve seat 53. The sealing portion 524 has the same diameter as the center hole of the lower valve seat 53. A return spring 56 is sleeved on the valve stem 52. One end of the return spring 56 abuts the upper valve seat 53, and the other end abuts a base 57, which is fixedly connected to the valve stem 52. The force of the return spring 56 drives the valve stem 52 downward, sealing the plug 523 with the upper valve seat 53 while opening the sealing portion 524 with the lower valve seat 53.

[0032] When the plug 523 opens the upper valve seat 53, the first mating portion 521 first engages the upper valve seat 53, creating a gap for the flow of drilling fluid. At this point, the drilling fluid flows rapidly, and the amount of drilling fluid that can flow within time T1 equals the maximum volume of the main control chamber 7. At this point, the sealing portion 524 seals against the lower valve seat 53, allowing drilling fluid to enter the main control chamber 7 and push the main piston 2 upward, thereby reaching its maximum pressure.

[0033] When the plug 523 opens the upper valve seat 53, the first matching portion 521 will first match with the upper valve seat 53, and the gap formed is used for the flow of drilling fluid. At this time, the flow speed of the drilling fluid is relatively fast. The amount of drilling fluid that can flow within the time T1 is equal to the maximum volume of the main control chamber 7. The sealing portion 524 seals and matches with the lower valve seat 53, allowing the drilling fluid to enter the main control chamber 7 and push the main piston 2 to move upward, thereby making the pressure of the drilling fluid reach the maximum value.

[0034] As the plug 523 continues to open the upper valve seat 53 and the second mating portion 522 engages the upper valve seat 53, the sealing portion 524 maintains a sealing engagement with the lower valve seat 53. The resulting gap slows the flow of drilling fluid. During time T1, the amount of drilling fluid flowing is less than the maximum volume of the main control chamber 7, potentially reaching half or one-third of the maximum volume. Although the main piston 2 has not yet moved to the second position, pressure has already begun to build above the throat 14.

[0035] After time T1 has passed, the driver 6 closes the drilling fluid from entering the main control chamber 7 through the control valve 5, so that the plug 523 cooperates with the upper valve seat 53 to seal, and the sealing part 524 separates from the lower valve seat 53, so that the drilling fluid in the main control chamber 7 flows out through the channel 511 and the lower valve seat 53, the main piston 2 returns to the first position, and the pressure of the drilling fluid above the throat 14 returns to normal.

[0036] Driver 6 opens control valve 5 for time T1, causing main piston 2 to move and completing drilling fluid pressure fluctuations. The pressure fluctuation peaks have two states, allowing information to be identified by detecting the two peaks of different heights. Simultaneously, driver 6 stops controlling control valve 5 for time T2. During this time, main piston 2 moves to the first position, restoring the drilling fluid pressure to normal. This ensures that a trough in the pressure fluctuation occurs. By detecting the trough state with the detector, the position of main piston 2 can be determined. Furthermore, the pulse generator's operating status can be determined based on the interval between the troughs.

[0037] Continue to refer Figure 2A filter screen 58 is provided inside the valve body 51 and is located between the two valve seats 53. The drilling fluid entering the main control chamber 7 is further filtered through the filter screen 58 to reduce the wear of the lower bearing 54 and the sliding bearing 21.

[0038] refer to Figure 4 A connecting pipe 8 is connected to the control valve 5. One end of the connecting pipe 8 is threadedly connected to the end of the valve body 51 away from the main body 31, so that the connecting pipe 8 is installed on the control valve 5. The driver 6 is arranged at the end of the connector away from the control valve 5. A long groove 81 and an inclined hole 82 are opened on the side wall of the connecting pipe 8. The long groove 81 is located at the position of the filter 83. The filter 83 is mesh-shaped and wrapped on the outer wall of the connecting pipe 8. The filter 83 blocks the debris of the drilling fluid outside the connecting pipe 8 from passing through the long groove 81 to prevent it from entering the connecting pipe 8. Most of the drilling fluid flowing out of the valve seat 53 below will flow out of the connecting pipe 8 through the filter 83. Some debris particles that cannot flow out can flow out through the inclined hole 82. The inclined hole 82 gradually tilts toward the outside of the connecting pipe 8 from top to bottom, which can prevent debris from entering the connecting pipe 8 through the inclined hole 82.

[0039] refer to Figure 1 and Figure 4 The driver 6 includes a shell 61, a main solenoid valve 62 and an auxiliary solenoid valve 63. The shell 61 includes an upper shell 611 and a lower shell 612. The upper shell 611 and the lower shell 612 are arranged up and down and fixedly connected. The upper end of the upper shell 611 is threadedly connected to the connecting pipe 8. The auxiliary solenoid valve 63 is installed in the upper shell 611, and the main solenoid valve 62 is installed in the lower shell 612. The inner rod inside the main solenoid valve 62 can move up and down after the coil is energized. The auxiliary solenoid valve 63 is slidably connected in the upper shell 611. The auxiliary solenoid valve 63 is fixedly connected to the end of the inner rod of the main solenoid valve 62. At the same time, a push rod 64 is fixedly provided on the movable end of the auxiliary solenoid valve 63. The push rod 64 can move up and down as the auxiliary solenoid valve 63 is energized. A rubber cup 65 is connected to the upper end of the push rod 64 and the upper housing 611. One end of the rubber cup 65 is secured to the end of the upper housing 611 via a hoop, achieving a seal. The other end is also secured to the outer wall of the push rod 64 via a hoop, further sealing the push rod and preventing drilling fluid from entering the interior of the driver 6. The rubber cup 65 has a deformable portion in the middle to accommodate the upward and downward movement of the push rod 64 and provide the elastic force to restore the push rod 64 to its lowest position. When the driver 6 receives coded information, the auxiliary solenoid valve 63 needs to be energized or de-energized. When the auxiliary solenoid valve 63 is de-energized, the main solenoid valve 62 operates independently, pushing the valve stem 52 through the push rod 64 and bringing the drilling fluid pressure to its maximum value. When the auxiliary solenoid valve 63 is energized, the main solenoid valve 62 also operates simultaneously, causing the drilling fluid pressure to increase, but not reach its maximum value. When the main solenoid valve 62 is de-energized, the auxiliary solenoid valve 63 is also de-energized, and the push rod 64 is restored by the action of the rubber cup 65, reducing the drilling fluid pressure to the trough.

[0040] refer to Figure 5 A permanent magnet 9 is fixedly mounted on the end of the inner rod of the main solenoid valve 62, away from the auxiliary solenoid valve 63. This permanent magnet 9 moves up and down with the movement of the inner rod of the main solenoid valve 62. A Hall switch 91 is fixedly mounted within the lower housing 612. This Hall switch 91 works in conjunction with the permanent magnet 9 to detect the operation of the main solenoid valve 62. When the permanent magnet 9 approaches the Hall switch 91, it detects the change in magnetic field intensity and determines the energization status of the main solenoid valve 62. This allows for convenient and accurate recording of the time the driver 6 stops controlling the main solenoid valve 62. After the preset time T2 is reached, the driver 6 is energized again. At this point, the permanent magnet 9 moves away from the Hall switch 91, indicating that the main solenoid valve 62 may already be energized. This allows for convenient and accurate recording of the time the driver 6 energizes the main solenoid valve 62 until the preset time T1 is reached, at which point the main solenoid valve 62 is deenergized. In this way, control of the main solenoid valve 62 is periodically completed.

[0041] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A high-rate pulse generating device, comprising a housing, characterized in that: A main piston and a drive assembly for controlling the movement of the main piston are provided in the housing. The position of the main piston corresponding to the housing is the throat, and the main piston moves along the housing to control the flow of drilling fluid in the throat toward the main piston. When the main piston moves to the first position, the pressure of the drilling fluid is normal. When the main piston moves to the second position, the main piston blocks the throat and the pressure of the drilling fluid increases. The drive assembly includes a control valve and a driver for driving the control valve. The control valve includes a valve body, a valve stem, and two valve seats spaced apart. The valve stem is disposed within the valve body. The valve body cooperates with the main piston to form a main control chamber. The valve stem is pushed by the driver and cooperates with the two valve seats to control the entry or exit of drilling fluid into or out of the main control chamber. The valve stem includes an integrally arranged plug, a first mating portion, a second mating portion, and a sealing portion. The first mating portion and the second mating portion can both be mated with the same valve seat under the action of the driver. The plug and the sealing portion are respectively sealed with one valve seat. The driver pushes the valve stem to move, the plug opens one valve seat, the sealing part closes the other valve seat, the first matching part matches with the valve seat and maintains the T1 time, and the main piston moves from the first position to the second position; the second matching part matches with the valve seat and maintains the T1 time, and the main piston moves from the first position to the middle between the first position and the second position; the driver releases the valve stem, the plug closes one valve seat, the sealing part opens the other valve seat and maintains the T2 time, and the main piston moves to the first position and stops.

2. A high-rate pulse generating device according to claim 1, characterized in that: A core shaft is provided at the center of the shell, and the core shaft includes a main body and a limiting ring. The main piston slides with the outer wall of the main body through a sliding bearing. The limiting ring is fixed on the main body. When the limiting ring abuts against the sliding bearing, the main piston is in the second position. A shoulder is provided on the main body. When the limiting ring abuts against the shoulder, the main piston is in the first position.

3. A high-rate pulse generating device according to claim 2, characterized in that: A lower bearing is provided on the outer wall of the valve body, and the main piston is sealed with the valve body through the lower bearing. One end of the valve body connected to the main piston is fixed to the main body and communicated with the interior of the main body. A screen pipe is connected to the end of the main body away from the valve body. A through hole for entering the drilling fluid into the interior of the main body is opened on the side wall of the screen pipe, and the through hole is covered with a sand net.

4. A high-rate pulse generating device according to claim 3, characterized in that: The valve body is provided with a channel connected to the main control chamber. The end of the channel away from the main control chamber is located between the two valve seats, and the valve stem and the valve seat cooperate to control the drilling fluid to enter the channel, or the valve stem and the other valve seat cooperate to control the drilling fluid in the channel to discharge from the valve body.

5. A high-rate pulse generating device according to claim 4, characterized in that: A connecting pipe is installed on the valve body, which is connected to the end of the valve body away from the main body. A long groove and an inclined hole are opened on the side wall of the connecting pipe. The outside of the long groove is covered with a filter element, and the inclined hole gradually tilts toward the outside of the connecting pipe along the flow direction of the drilling fluid.

6. A high-rate pulse generating device according to claim 1, characterized in that: The driver includes a shell, a main solenoid valve and an auxiliary solenoid valve. The shell is fixedly connected to the valve body, the main solenoid valve is fixed in the shell, the auxiliary solenoid valve is fixed on the inner rod of the main solenoid valve, the auxiliary solenoid valve is slidingly arranged in the shell, and a push rod is fixedly arranged on the movable end of the auxiliary solenoid valve. The push rod is used to push the valve stem to move. When the main solenoid valve and the auxiliary solenoid valve are energized at the same time, the valve stem moves to the second matching part to match the valve seat. When the main solenoid valve is energized alone, the valve stem moves to the first matching part to match the valve seat.

7. A high-rate pulse generating device according to claim 6, characterized in that: A permanent magnet is fixed on the inner rod of the main solenoid valve, and a Hall switch is fixed in the shell. The permanent magnet judges the working state of the main solenoid valve through the Hall switch as the inner rod moves, so that the main solenoid valve maintains the current state for T1 or T2 time.

8. A high-rate pulse generating device according to claim 6, characterized in that: A rubber cup is installed on the push rod and fixed between the shell and the push rod to seal the connection position between the push rod and the shell. The middle part of the rubber cup is deformed to adapt to the movement of the push rod relative to the shell.

9. The high-rate pulse generating device according to claim 1, characterized in that: A filter is provided inside the valve body and is located between the two valve seats. The filter is used to filter the drilling fluid flowing into the main control chamber.

10. A high-rate pulse generating device according to claim 2, characterized in that: The outer shell includes a mounting ring seat and a flow limiting ring. The inner wall of the flow limiting ring gradually shrinks toward the center along the flow direction of the drilling fluid to form the throat. The mounting ring seat is used to fix the flow limiting ring and the core shaft. The core shaft is set in the center of the flow limiting ring through the centering frame.

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