A high rate pulse generating device

Abstract

The present application relates to the technical field of oil exploitation, and specifically relates to a high-speed pulse generating device, a valve rod is pushed by a driver and is matched with two valve seats respectively 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, the plug and the sealing part are matched with a valve seat respectively; the first matching part is matched with the valve seat and keeps T1 time, a main piston moves from a first position to a second position; the second matching part is matched with the valve seat and keeps T1 time, the main piston moves from the first position to a position between the first position and the second position; the driver releases the valve rod, the plug closes one valve seat, the sealing part opens the other valve seat, and keeps T2 time, and the main piston moves to the first position to stop. The present application has the effect of reducing the influence of sundries on the normal work of the pulse generating device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil exploitation, and particularly relates to a high-speed pulse generating device. BACKGROUND

[0002] With the vigorous development of the oil industry at home and abroad, wireless drilling inclination meters have been rapidly developed and updated. A pulse generator is the most important component of a wireless drilling measurement system, which mainly transmits signals through pressure waves of mud. The pulse generator is usually installed on a drill pipe and moves with the drill bit. The signal transmitted by the pressure wave reaches the ground through the mud, and a decoding system on the ground decodes by detecting pressure fluctuations, so that the detection data is transmitted to the ground. The detection data includes the direction of the drill bit, the circulation state of the drilling fluid, etc.

[0003] A drilling fluid pulse signal generator is disclosed in the related art, which comprises a shell and an inner core arranged inside the shell. A cavity is arranged inside the inner core. A rotor shaft and a stator coil are arranged concentrically inside the cavity. A turbine is arranged on the axial outer side of the first end of the inner core. The turbine is fixedly connected with the rotor shaft. A valve disc mechanism is arranged between the axial direction of the inner core and the turbine. The valve disc mechanism comprises a stator disc and a rotor disc. The rotor disc is driven to rotate by the turbine. The flow area of the valve disc mechanism changes periodically. A pressure acquisition device is arranged at the wellhead. The turbine can drive the rotor disc to rotate under the pushing 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 energization and de-energization, so as to control the frequency of the pressure pulse signal. The signal frequency is collected and analyzed by the pressure acquisition device, so as to complete the transmission of downhole measurement information.

[0004] However, the drilling fluid inevitably contains rock particle or other impurity particles. These particles may be stuck between the rotor disc and the stator disc, which makes the rotor disc unable to rotate, so that the pulse generator cannot work normally. The flow rate of the drilling fluid has to be increased to flush away the rotor disc. When the rotor disc cannot be flushed away, the pulse generator has to be taken out for cleaning, thereby affecting the working efficiency of drilling. SUMMARY

[0005] The present application provides a high-speed pulse generating device, which aims to reduce the problem that the impurities in the drilling fluid affect the normal work of the pulse device in the related art.

[0006] The high-speed pulse generating device comprises a shell, a main piston and a driving assembly for controlling the movement of the main piston are arranged in the shell, the position of the main piston corresponding to the shell is a throat, and the main piston moves along the shell to control the flow of the drilling fluid in the direction of the main piston, the pressure of the drilling fluid is normal when the main piston moves to a first position, and the main piston blocks the throat when the main piston moves to a second position, and the pressure of the drilling fluid is increased; the driving assembly comprises a control valve and a driver for driving the control valve, the control valve comprises a valve body, a valve rod and two interval arranged valve seats, the valve rod is arranged in the valve body, the valve body cooperates with the main piston to form a main control cavity, the valve rod is pushed by the driver and cooperates with the two valve seats respectively to control the drilling fluid to enter or flow out of the main control cavity; the valve rod comprises an integrated plug, a first matching part, a second matching part and a sealing part, the first matching part and the second matching part can cooperate with the same valve seat under the action of the driver, and the plug and the sealing part are respectively sealed with a valve seat; the driver pushes the valve rod to move, the plug opens one valve seat, the sealing part closes the other valve seat, the first matching part cooperates with the valve seat and remains for T1 time, and the main piston moves from the first position to the second position; the second matching part cooperates with the valve seat and remains for T1 time, and the main piston moves from the first position to the middle position between the first position and the second position; the driver releases the valve rod, the plug closes one valve seat, the sealing part opens the other valve seat, and remains 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 shell forms a throat. When the main piston moves to the second position, the pressure of the drilling fluid above the throat is increased. Since the main control cavity is driven by the entering of the drilling fluid to move the main piston, even if there is a small amount of impurities in the throat position, the drilling fluid will still produce a large pressure rise due to the reduced flow. When the throat is opened by the main piston, the flow of the drilling fluid at the throat is large, and the pressure of the drilling fluid above the throat will not be increased. Such a structure can reduce the influence of impurities on the normal operation of the pulse device.

[0008] At the same time, the driver pushes the valve rod to move, the plug opens one valve seat, and at this time the drilling fluid flows into the main control cavity through the gap between the first matching part and the valve seat. Since the flow of the drilling fluid is large, the main piston can reach the second position within T1 time to form the largest pressure peak wave of the drilling fluid; and the gap between the second matching part and the valve seat is small, and the flow into the main control cavity is small, so the main piston cannot reach the second position within T1 time, and can only form a smaller pressure peak wave. Within T2 time, the main piston can move to the first position and stop, thereby forming a wave trough of the pressure change of the drilling fluid. The wave trough can be produced in each action, so that the pulse signal can be transmitted through the peak value of the pressure fluctuation, and the completion of each action can be determined through the time when the wave trough appears. In this way, the pulse signal has an accurate end signal, and the transmission of the next signal can be performed in time after the end signal, thereby ensuring accuracy and improving transmission rate.

[0009] Preferably, the center of the shell is provided with a mandrel, the mandrel comprises a body and a limiting ring, the main piston is in sliding fit with the outer wall of the body through a sliding bearing, the limiting ring is fixed on the body, when the limiting ring abuts against the sliding bearing, the main piston is in the second position, a shoulder is arranged on the body, when the limiting ring abuts against the shoulder, the main piston is in the first position.

[0010] The effect of which is that the sliding bearing is arranged on the main piston and between the shoulder and the limiting ring, such 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 arranged on the outer wall of the valve body, the main piston is sealed with the valve body through the lower bearing, one end of the valve body connected with the main piston is fixed with the body and communicates with the inside of the body, a screen pipe is connected to the end of the body away from the valve body, a through hole for the drilling fluid to enter the inside of the body is arranged on the side wall of the screen pipe, and a sand screen is covered on the through hole.

[0012] The effect of which is that the side wall of the screen pipe is covered with the sand screen, which can effectively block the sundries in the drilling fluid from entering the main control cavity, thereby reducing the wear of the lower bearing by the sundries and prolonging the service life of the lower bearing.

[0013] Preferably, a channel communicating with the main control cavity is arranged on the valve body, the end of the channel away from the main control cavity is between the two valve seats, and the body is controlled to enter the drilling fluid in the channel through the cooperation of the valve rod and the valve seat, or the drilling fluid in the channel is discharged out of the valve body through the cooperation of the valve rod and the other valve seat.

[0014] Preferably, a connecting pipe is installed on the valve body, the connecting pipe is connected to the end of the valve body away from the body, a long slot and an inclined hole are arranged on the side wall of the connecting pipe, a filter element is covered on the outside of the long slot, and the inclined hole gradually inclines to the outside of the connecting pipe along the flow direction of the drilling fluid.

[0015] The effect of which is that the long slot on the connecting pipe is the main outflow position of the drilling fluid in the main control cavity, the filter element can prevent the sundries in the external drilling fluid from entering the connecting pipe, and the inclined hole can discharge the sundries that cannot pass through the filter element out of the connecting pipe.

[0016] Preferably, the driver comprises a shell, a main electromagnetic valve and a secondary electromagnetic valve, the shell is fixedly connected with the valve body, the main electromagnetic valve is fixed in the shell, the secondary electromagnetic valve is fixed on the inner rod of the main electromagnetic valve, the secondary electromagnetic valve is slidingly arranged in the shell, a push rod is fixedly arranged on the movable end of the secondary electromagnetic valve, the push rod is used to push the valve rod to move, the main electromagnetic valve and the secondary electromagnetic valve are simultaneously electrified, the valve rod moves to the second cooperation part to cooperate with the valve seat, the main electromagnetic valve is separately electrified, and the valve rod moves to the first cooperation part to cooperate with the valve seat.

[0017] Preferably, a permanent magnet is fixed on the inner rod of the main electromagnetic valve, and a Hall switch is fixed in the shell, and the permanent magnet passes the Hall switch to determine the working state of the main electromagnetic valve with the movement of the inner rod, so that the main electromagnetic valve keeps the current state T1 or T2 for a period of time.

[0018] Preferably, a rubber cup is mounted on the push rod, and the rubber cup is fixed between the shell and the push rod, and is used for sealing the position where the push rod is connected with the shell, and the middle part of the rubber cup is deformed to adapt to the movement of the push rod relative to the shell.

[0019] Its effect lies in that the permanent magnet is close to or far away from the Hall switch with the movement of the inner rod. The working state of the main electromagnetic valve can be determined through the Hall effect of the Hall switch, so that the T1 and T2 time of the main electromagnetic valve can be accurately controlled.

[0020] Preferably, a filter screen is arranged in the valve body and is located between the two valve seats, and the filter screen is used for filtering the drilling fluid flowing into the main control chamber.

[0021] Preferably, the shell comprises a mounting ring seat and a flow-limiting ring, the inner wall of the flow-limiting ring is gradually contracted to the center along the flow direction of the drilling fluid to form the throat, and the mounting ring seat is used for fixing the flow-limiting ring and the mandrel, and the mandrel is arranged at the center of the flow-limiting ring through the centering frame.

[0022] By adopting the technical scheme, the present application has the following beneficial effects:

[0023] The main control chamber is driven by the entering of the drilling fluid to move the main piston, so that even if there is a small amount of impurities at the position of the throat, the drilling fluid will still have a large pressure rise due to the reduced flow. 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 rise. Such a structure can reduce the influence of impurities on the normal operation of the pulse device. The trough can be generated in each action, so that the pulse signal can be transmitted through the peak value of the pressure fluctuation, and the completion of each action can be determined through the time when the trough appears. In this way, the pulse signal has an accurate end signal, and the transmission of the next signal can be performed in time after the end signal, so that the transmission rate is improved while the accuracy is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a whole structure sectional view of a high-speed pulse generating device of the present application;

[0025] Figure 2 It is a position schematic view of a control valve in the embodiment of the present application;

[0026] Figure 3 It is Figure 1 It is a local enlarged view of part A in FIG. 6;

[0027] Figure 4 This is a connection structure diagram of the pipe in an embodiment of the present invention;

[0028] Figure 5 yes Figure 1 A magnified view of part B in the middle section.

[0029] Figure label:

[0030] 1. Outer shell; 11. Gland; 12. Mounting ring seat; 13. Flow 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. Salvage spear; 5. Control valve; 51. Valve body; 511. Channel; 52. Valve stem; 521. First mating part; 522. Second mating part; 523. Plug; 524. Sealing part; 53. Valve seat; 54. Lower bearing; 55. Guide sleeve; 56. Return spring; 57. Base; 58. Filter screen; 6. Actuator; 61. Housing; 611. Upper housing; 612. Lower housing; 62. Main solenoid valve; 63. Auxiliary solenoid valve; 64. Push rod; 65. Glue cup; 7. Main control chamber; 8. Connecting pipe; 81. Long groove; 82. Slanted hole; 83. Filter element; 9. Permanent magnet; 91. Hall switch. Detailed Implementation

[0031] The following is combined Figures 1 to 5 Embodiments of the present invention will be described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0032] This embodiment discloses a high-speed pulse generator, such as... Figure 1 and Figure 2 As shown, the system includes a housing 1, which is a cylindrical structure. Drilling fluid is pumped from the upper end to the lower end of the housing 1, flowing downwards to the drill bit. A main piston 2 is located at the center of the housing 1. The main piston 2 controls the flow rate of the drilling fluid within the housing 1. When the main piston 2 stops the flow of drilling fluid, the pressure of the drilling fluid increases; when the main piston 2 resumes the flow, the pressure returns to normal, thus allowing for pressure variations in the drilling fluid. A mandrel, fixedly mounted to the housing 1, is located at the center of the main piston 2. The centerline of the mandrel coincides with the centerline of the housing 1, and a drive assembly for controlling the movement of the main piston 2 is mounted on the mandrel.

[0033] refer to Figure 1 , Figure 2 and Figure 3The housing 1 comprises a gland 11, a mounting ring seat 12 and a flow limiting ring 13, the mounting ring seat 12, the gland 11 and the flow limiting ring 13 are all cylindrical structures, the upper end of the mounting ring seat 12 is used for threadedly connecting the gland 11, the flow limiting ring 13 is placed in the mounting ring seat 12, and the flow limiting ring 13 is then fixed by the gland 11. The inner wall of the mounting ring seat 12 is inwardly contracted to form a tapered mounting position, which can also be a stepped mounting position, so that one end of the flow limiting ring 13 is inserted into the mounting position and abuts on the mounting position, and then the end of the flow limiting ring 13 is pressed by the end of the gland 11, so that the gland 11 cooperates with the mounting position to clamp the flow limiting ring 13. The inner wall of the flow limiting ring 13 gradually contracts to the center along the flow direction of the drilling fluid to form a throat portion 14. The gap between the position of the throat portion 14 and the outer wall of the mandrel is used for flowing the drilling fluid. The main piston 2 can move upward from the position below the throat portion 14 into the gap between the throat portion 14 and the mandrel, so as to change the drilling fluid pressure above the throat portion 14. This change can be obtained by the acquisition system on the ground, and then the information can be obtained by decoding. One end of the main piston 2 which can enter the throat portion 14 has a diameter smaller than the inner diameter of the throat portion 14, so that the drilling fluid pressure is increased to form a flow reduction at the position of the throat portion 14. The more the flow reduction is, the more the drilling fluid pressure above the throat portion 14 is increased, and vice versa. The position of the main piston 2 away from the throat portion 14 is a first position, and the main piston 2 does not cooperate with the flow limiting ring 13 to limit the flow at the first position, and the drilling fluid is at a normal pressure. The position of the main piston 2 entering the throat portion 14 is a second position, and the main piston 2 cooperates with the flow limiting ring 13 to limit the flow at the second position, so that the drilling fluid pressure above the throat portion 14 is maximum. The time for the driving assembly to move the main piston 2 from the first position to the second position is T1.

[0034] Reference Figure 1 , Figure 2 and Figure 3The core shaft comprises a body 31, a screen pipe 32 and a limiting ring 33. The body 31 is externally sleeved with an annular sliding bearing 21. The main piston 2 is installed on the outer wall of the sliding bearing 21, so that the main piston 2 is in sliding connection with the body 31 through the sliding bearing 21. The inner part of the body 31 is in a hollow structure and is in communication with the screen pipe 32 at one end. The screen pipe 32 is fixedly connected with the outer shell 1 through the centering frame 15 in the inner part of the gland 11. The outer wall of the screen pipe 32 and the inner wall of the gland 11 are spaced apart to form a space for the flow of the drilling fluid. Meanwhile, the screen pipe 32 is installed with a fishing spear 4 at the end away from the body 31. The limiting ring 33 is fixed on the side wall of the body 31 and is above the throat 14. The limiting ring 33 is used to abut against the sliding bearing 21, so that the main piston 2 is stopped at the second position. A shoulder 34 is arranged on the body 31 and abuts against the sliding bearing 21. When the sliding bearing 21 abuts against the shoulder 34, the main piston 2 is moved to the first position. The movement range of the main piston 2 is limited by the limiting ring 33 and the shoulder 34, so that the movement position of the main piston 2 is ensured, thereby the maximum value and the minimum value of the pulse pressure can be accurately formed. When the main piston 2 is at the second position, the pressure of the drilling fluid is the maximum value. When the main piston 2 is at the first position, the pressure of the drilling fluid is the minimum value.

[0035] A through hole 321 in communication with the inner part of the screen pipe 32 is arranged on the side wall of the end of the screen pipe 32 installed with the fishing spear 4. A plurality of through holes 321 are arranged. A sand net 35 is arranged on the outer wall of the screen pipe 32. The sand net 35 covers the peripheral wall of the screen pipe 32 and is used to block the through holes 321, so that the drilling fluid entering into the screen pipe 32 is filtered. The drilling fluid entering into the screen pipe 32 is only used to drive the driving assembly, and is not the main flow direction of the drilling fluid. Therefore, the drilling fluid passing through the sand net 35 is less. Meanwhile, the sand net 35 can prevent sundries from entering into the screen pipe 32.

[0036] Reference Figure 1 , Figure 2 and Figure 4The driving assembly comprises a control valve 5 and a driver 6 for driving the control valve 5, the control valve 5 comprises a valve body 51, a valve rod 52 and a valve seat 53, the valve body 51 is in a cylindrical structure, one end of the valve body 51 is connected with the body 31 and communicates with the inside of the body 31. Meanwhile, the main piston 2 is sleeved on the valve body 51 near one end of the valve body 51, and a lower bearing 54 is arranged on the outer wall of the valve body 51, which is used for sealing between the main piston 2 and the valve body 51. The inside of the main piston 2 forms a main control cavity 7 through the connection with the valve body 51. The main control cavity 7 communicates with the inside of the body 31 through the control valve 5. When the control valve 5 is opened to make the main control cavity 7 communicate with the body 31, drilling fluid will enter the main control cavity 7, and the pressure of the drilling fluid pushes the main piston 2 to move upward, so that the main piston 2 moves to the second position. When the control valve 5 is closed, the drilling fluid is prevented from entering the main control cavity 7, the drilling fluid flows out of the main control cavity 7, and the main piston 2 is pushed downward by the drilling fluid outside the body 31 and stops at the first position.

[0037] Reference Figure 2 The valve seat 53 is provided with two valve seats 53 arranged in an upper and lower interval, and the two valve seats 53 are fixed on the valve body 51. A passage 511 is formed in the valve body 51, one end of the passage 511 communicates with the main control cavity 7, and the other end communicates with a position between the two valve seats 53. A guide sleeve 55 is fixedly arranged on each of the two valve seats 53, the guide sleeve 55 has an opening, so that the drilling fluid can pass through the valve seat 53, and the valve rod 52 penetrates through the guide sleeve 55 and is in sliding connection with the guide sleeve 55. The moving direction of the valve rod 52 coincides with the center line of the valve body 51 through the guide sleeve 55. The valve rod 52 is provided with a first matching part 521, a second matching part 522 and a plug 523 at the position of the upper valve seat 53, and is provided with a sealing part 524 at the position of the lower valve seat 53. The plug 523, the first matching part 521 and the second matching part 522 are sequentially arranged from top to bottom, the diameter of the first matching part 521 is smaller than the diameter of the second matching part 522, and the diameter of the second matching part 522 is also smaller than the diameter of the center hole of the upper valve seat 53, and the diameter of the sealing part 524 is equal to the diameter of the center hole of the lower valve seat 53. A reset spring 56 is sleeved on the valve rod 52, one end of the reset spring 56 abuts against the upper valve seat 53, and the other end abuts against a base 57 fixedly connected with the valve rod 52. The force of the reset spring 56 is used to drive the valve rod 52 to move downward, and the plug 523 is in a sealing position with the upper valve seat 53, and the sealing part 524 is in an open state with the lower valve seat 53.

[0038] When the plug 523 opens the upper valve seat 53, the first matching part 521 will first match with the upper valve seat 53, and the gap formed is used for flowing the drilling fluid. At this time, the flow rate of the drilling fluid is relatively fast, and the amount of drilling fluid that can flow within the Tl time is equal to the maximum volume of the main control cavity 7. At this time, the sealing part 524 is in sealing cooperation with the lower valve seat 53, so that the drilling fluid enters the main control cavity 7 to push the main piston 2 to move upward, so that the pressure of the drilling fluid reaches the maximum value.

[0039] When the plug 523 opens the upper valve seat 53, the first matching part 521 will first match with the upper valve seat 53, and the gap formed is used for flowing the drilling fluid. At this time, the flow rate of the drilling fluid is relatively fast, and the amount of drilling fluid that can flow within the Tl time is equal to the maximum volume of the main control cavity 7. At this time, the sealing part 524 is in sealing cooperation with the lower valve seat 53, so that the drilling fluid enters the main control cavity 7 to push the main piston 2 to move upward, so that the pressure of the drilling fluid reaches the maximum value.

[0040] When the plug 523 continues to open the upper valve seat 53 and the second matching part 522 matches with the upper valve seat 53, the sealing part 524 is still in sealing cooperation with the lower valve seat 53. At this time, the gap formed slows down the flow rate of the drilling fluid, and the amount of drilling fluid that can flow within the Tl time is less than the maximum volume of the main control cavity 7, which can be half or one third of the maximum volume. At this time, the main piston 2 has not moved to the second position, but has begun to form a pressure rise above the throat 14.

[0041] After Tl time, the driver 6 closes the control valve 5 to make the drilling fluid enter the main control cavity 7, so that the plug 523 matches with the upper valve seat 53 to be sealed, and the sealing part 524 is separated from the lower valve seat 53, so that the drilling fluid in the main control cavity 7 flows out through the passage 511 and the lower valve seat 53, and the main piston 2 returns to the first position. The pressure of the drilling fluid above the throat 14 returns to normal.

[0042] The driver 6 opens the control valve 5 for Tl time to make the main piston 2 move, complete the pressure fluctuation of the drilling fluid, and the peak of the pressure fluctuation has two states, so that the information can be identified by detecting the two different height peaks. At the same time, the time when the driver 6 stops controlling the control valve 5 is T2, and within the T2 time, the main piston 2 moves to the first position, so that the pressure of the drilling fluid returns to the normal state, and the trough of the pressure fluctuation must appear. The state of the trough detected by the detector can determine the position of the main piston 2. At the same time, the working condition of the pulse generating device can be judged according to the interval period of the trough.

[0043] Continuing to refer to Figure 2A filter screen 58 is arranged in the interior of 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.

[0044] With reference 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 body 31, so that the connecting pipe 8 is mounted on the control valve 5. The driver 6 is arranged at the end of the connecting pipe 8 away from the control valve 5. A long slot 81 and an inclined hole 82 are formed in the side wall of the connecting pipe 8. The long slot 81 is located at a filter member 83 which is in the form of a mesh and is wrapped around the outer wall of the connecting pipe 8. The filter member 83 blocks the long slot 81 to prevent the impurities in the drilling fluid outside the connecting pipe 8 from entering the connecting pipe 8. Most of the drilling fluid flowing out of the lower valve seat 53 flows out of the connecting pipe 8 through the filter member 83. The impurity particles that cannot flow out can flow out through the inclined hole 82. The inclined hole 82 gradually inclines outward from the top to the bottom of the connecting pipe 8, so that the impurities are prevented from entering the connecting pipe 8 through the inclined hole 82.

[0045] With reference to Figure 1 And Figure 4 The driver 6 comprises a housing 61, a main electromagnetic valve 62 and a secondary electromagnetic valve 63. The housing 61 comprises an upper housing 611 and a lower housing 612 which are arranged one above the other and are fixedly connected. The upper end of the upper housing 611 is threadedly connected to the connecting pipe 8. The secondary electromagnetic valve 63 is arranged in the upper housing 611. The main electromagnetic valve 62 is arranged in the lower housing 612. The inner rod in the main electromagnetic valve 62 can move up and down after the coil is energized. The secondary electromagnetic valve 63 is slidably connected in the upper housing 611. The secondary electromagnetic valve 63 is fixedly connected to the end of the inner rod of the main electromagnetic valve 62. The movable end of the secondary electromagnetic valve 63 is fixedly provided with a push rod 64. The push rod 64 can move up and down with the secondary electromagnetic valve 63. A rubber cup 65 is connected to the upper end of the upper housing 611 and the push rod 64. One end of the rubber cup 65 can be fixedly connected to the end of the upper housing 611 by a hoop to achieve sealing. The other end of the rubber cup 65 can also be fixedly connected to the outer wall of the push rod 64 by a hoop to achieve sealing, so that the drilling fluid is prevented from entering the interior of the driver 6. The middle part of the rubber cup 65 has a deformed part which can adapt to the up-and-down movement of the push rod 64 and has a restoring force to restore the push rod 64 to the lowest position. When the driver 6 receives the coded information, the secondary electromagnetic valve 63 needs to be energized or de-energized. When the secondary electromagnetic valve 63 is de-energized, the main electromagnetic valve 62 acts alone to push the valve rod 52 through the push rod 64 and to make the pressure of the drilling fluid reach the maximum value. When the secondary electromagnetic valve 63 is energized, the main electromagnetic valve 62 acts simultaneously. At this time, the pressure of the drilling fluid rises but does not reach the maximum value. When the main electromagnetic valve 62 is de-energized, the secondary electromagnetic valve 63 is de-energized. The push rod 64 is restored under the action of the rubber cup 65 to reduce the pressure of the drilling fluid to the position of the trough.

[0046] Reference Figure 5 A permanent magnet 9 is fixedly arranged at the end of the inner rod of the main electromagnetic valve 62 away from the auxiliary electromagnetic valve 63, and the permanent magnet 9 moves up and down with the movement of the inner rod of the main electromagnetic valve 62. A Hall switch 91 is fixedly arranged in the lower housing 612, and the Hall switch 91 is used in cooperation with the permanent magnet 9 to detect the action of the main electromagnetic valve 62. When the permanent magnet 9 approaches the Hall switch 91, the Hall switch 91 can sense the change of the magnetic field intensity and determine the energization state of the main electromagnetic valve 62. In this way, the time when the driver 6 stops controlling the main electromagnetic valve 62 can be conveniently and accurately recorded, and the driver 6 is energized after the preset T2 time is reached. At this time, the permanent magnet 9 is away from the Hall switch 91, indicating that the main electromagnetic valve 62 may have been in an energized state. Thus, the energization time of the driver 6 to the main electromagnetic valve 62 can be conveniently and accurately recorded, and the energization to the main electromagnetic valve 62 is turned off after the preset T1 time is reached. In this way, the control of the main electromagnetic valve 62 is periodically completed.

[0047] Although the embodiments of the present application have been shown and described above, it should be understood that the above-described embodiments are exemplary, and should not be construed as limiting the present application, and those of ordinary skill in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A high rate pulse generating device comprising a housing, characterized in that, The housing is provided with a main piston and a driving assembly for controlling the movement of the main piston, the main piston corresponds to the position of the housing throat, and the main piston moves along the housing to control the flow of drilling fluid to the main piston direction, the main piston moves to the first position, the pressure of the drilling fluid is normal, the main piston moves to the second position, the main piston blocks the throat, and the pressure of the drilling fluid rises; The driving assembly includes a control valve and a driver for driving the control valve, the control valve includes a valve body, a valve rod and two spaced valve seats, the valve rod is arranged in the valve body, the valve body cooperates with the main piston to form a main control cavity, the valve rod is pushed by the driver and cooperates with the two valve seats respectively to control the drilling fluid into or out of the main control cavity; The valve rod includes an integrated plug, a first matching part, a second matching part and a sealing part, the first matching part and the second matching part can cooperate with the same valve seat under the action of the driver, and the plug and the sealing part are respectively sealed with a valve seat. The driver includes a housing, a main electromagnetic valve and a secondary electromagnetic valve, the housing is fixedly connected with the valve body, the main electromagnetic valve is fixed in the housing, the secondary electromagnetic valve is fixed on the inner rod of the main electromagnetic valve, the secondary electromagnetic valve is slidably arranged in the housing, the movable end of the secondary electromagnetic valve is fixedly provided with a push rod, the push rod is used to push the valve rod to move, the main electromagnetic valve and the secondary electromagnetic valve are electrified at the same time, the valve rod moves to the second matching part and cooperates with the valve seat, the main electromagnetic valve is electrified alone, and the valve rod moves to the first matching part and cooperates with the valve seat. The driver pushes the valve rod to move, the plug opens one valve seat, the sealing part closes the other valve seat, the first matching part cooperates with the valve seat and keeps T1 time, the main piston moves from the first position to the second position; the second matching part cooperates with the valve seat and keeps 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 rod, the plug closes one valve seat, the sealing part opens the other valve seat, and keeps T2 time, and the main piston moves to the first position and stops.

2. A high rate pulse generator as claimed in claim 1, wherein The center of the housing is provided with a mandrel, the mandrel includes a body and a limiting ring, the main piston is slidably connected with the outer wall of the body through a sliding bearing, the limiting ring is fixed on the body, when the limiting ring abuts against the sliding bearing, the main piston is in the second position, a shoulder is arranged on the body, when the limiting ring abuts against the shoulder, the main piston is in the first position.

3. A high rate pulse generator as claimed in claim 2, wherein The outer wall of the valve body is provided with a lower bearing, the main piston is sealed with the valve body through the lower bearing, one end of the valve body connected with the main piston is fixed with the body and communicates with the inside of the body, a screen pipe is connected to the end of the body away from the valve body, a through hole for the drilling fluid to enter the inside of the body is formed in the side wall of the screen pipe, and a sand net covers the through hole.

4. A high rate pulse generator as claimed in claim 3, wherein A channel is formed in the valve body and communicates with the main control cavity, one end of the channel away from the main control cavity is between the two valve seats, and the drilling fluid in the channel is controlled to enter the body or be discharged from the valve body through the cooperation of the valve rod with the valve seat or the other valve seat.

5. A high rate pulse generating device according to claim 4, wherein A connecting pipe is installed on the valve body, the connecting pipe is connected to the end of the valve body away from the body, a long slot and an inclined hole are formed in the side wall of the connecting pipe, a filter element covers the outside of the long slot, and the inclined hole gradually inclines to the outside of the connecting pipe along the flow direction of the drilling fluid.

6. A high rate pulse generator as claimed in claim 1, wherein, The inner rod of the main electromagnetic valve is fixedly provided with a permanent magnet, and the housing is fixedly provided with a Hall switch. The permanent magnet passes through the Hall switch to judge the working state of the main electromagnetic valve along with the movement of the inner rod, so as to make the main electromagnetic valve keep the current state T1 or T2 for a period of time.

7. The high rate pulse generator of claim 1, wherein: The push rod is provided with a glue cup, which is fixed between the housing and the push rod and is used for sealing the position where the push rod is connected with the housing. The middle part of the glue cup is deformed to adapt to the movement of the push rod relative to the housing.

8. The high rate pulse generator of claim 1, wherein: The valve body is internally provided with a filter screen, which is located between the two valve seats and is used for filtering the drilling fluid flowing into the main control chamber.

9. A high rate pulse generating device as claimed in claim 2, characterized in that The housing comprises a mounting ring seat and a flow limiting ring. The inner wall of the flow limiting ring gradually shrinks to the center along the flow direction of the drilling fluid to form the throat. The mounting ring seat is used for fixing the flow limiting ring and the mandrel. The mandrel is arranged at the center of the flow limiting ring through the centering frame.

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