Oscillation shear valve and continuous wave high-speed transmission method

Abstract

The invention relates to the technical field of underground resource drilling engineering, in particular to an oscillating shear valve and a continuous wave high-speed transmission method.The oscillating shear valve comprises a valve seat, a stator, a rotor and a driving assembly, and the inner side of the upper portion of the valve seat and the outer side of the upper end of the stator are fixedly installed together. The structure is reasonable and compact, the rotor is driven by the driving assembly to rotate, when the rotor rotates and slurry flows into the position below the valve element through the flow hole, due to the fact that the difference value between the third area and the second area changes along with rotation of the rotor, the pressure of the slurry changes, pulse signals are formed, and therefore the changed pressure is reserved when the slurry circulates to a wellhead; the difference value between the third area and the second area is the same as the difference value between the third area and the second area, the frequency can be changed instantly, and compared with a traditional oscillating shear valve, the buffer time occupied when the frequency is changed is saved, the transmission rate is increased, and higher data density can be generated.

Description

Technical Field

[0001] The present invention relates to the technical field of underground resource drilling and production engineering, and is an oscillating shear valve and a continuous wave high-speed transmission method. Background Art

[0002] During drilling operations, the Measurement While Drilling (MWD) technology uses the mud in the annulus as the carrier for transmitting signals, and transmits the drilling parameter data from the downhole to the ground in real time, which plays a crucial role in guiding and making decisions for drilling operations.

[0003] In order to timely understand the engineering and geological parameters during drilling, a mud pulse generator is usually used; the conventional mud pulse generator obtains downhole information through a solenoid valve mechanism, and then drives a mushroom head to move up and down at the choke ring by the solenoid valve mechanism. By controlling the annulus cross-sectional area between the mushroom head and the choke ring, the mud pressure flowing in the drill pipe is changed to generate a mud pressure fluctuation; since the mushroom head moves linearly up and down, the output mud pressure fluctuation is output in the form of intermittent pulses with a very short duration, and the transmission speed is slow; in addition, the flow area between the mushroom head and the choke ring is small, and it is greatly affected by the mud density; in the case of too high mud density or the presence of plugging materials in the mud, blockage is likely to occur.

[0004] With the rapid development of technology, the continuously updated and iterated logging-while-drilling technology has greatly increased the amount of information collected by downhole logging-while-drilling equipment. However, the data rate of the traditional rotary shear valve mud pulse transmission technology is usually lower than 6 bit / s, which is difficult to meet the growing demand for real-time bandwidth. Summary of the Invention

[0005] The present invention provides an oscillating shear valve and a continuous wave high-speed transmission method, which overcome the above-mentioned deficiencies of the prior art, and can effectively solve the problems that the output mud pressure fluctuation of the existing traditional rotary shear valve is output in the form of intermittent pulses with a very short duration, the transmission speed is slow, and it is difficult to meet the growing demand for real-time bandwidth.

[0006] One of the technical solutions of the present invention is achieved through the following measures: an oscillating shear valve, comprising a valve seat, a stator, a rotor and a driving assembly, wherein the inner side of the upper part of the valve seat is fixedly installed with the outer side of the upper end of the stator, and the upper end of the stator is evenly spaced along the circumference with a plurality of flow holes that pass through up and down, and a rotor is rotatably installed on the inner side of the valve seat corresponding to the lower end of the stator, and a valve core corresponding to the flow hole is fixed on the outer side of the upper end of the rotor, and the overlapping area of ​​the projection of the lower end of the stator on the horizontal plane between two adjacent flow holes and the projection of the corresponding valve core on the horizontal plane is the first area, the overlapping area of ​​the projection of the lower end of the flow hole on the horizontal plane and the projection of the corresponding valve core on the horizontal plane is the second area, and the projection area of ​​the lower end of the flow hole on the horizontal plane is the third area, and the difference between the third area and the second area is the same as the first area, and a driving assembly that can drive the rotor to rotate is installed on the inner side of the lower part of the valve seat.

[0007] The following is a further optimization and / or improvement of one of the above-mentioned technical solutions: The cross-sectional area of ​​the above-mentioned flow hole can gradually decrease from top to bottom, and at least one side of the inner wall of the flow hole is arranged in an up-down spiral. A fixing frame is fixedly installed on the inner side of the upper end of the valve seat corresponding to the upper end position of the stator, and a plurality of liquid inlet holes that pass through the upper and lower parts are evenly distributed along the circumference on the upper side of the fixing frame. A salvage anchor with its upper end located above the fixing frame is fixedly installed in the center of the upper side of the fixing frame.

[0008] A wear-resistant sleeve may be mounted between the inner side of the lower part of the valve seat corresponding to the lower end of the stator and the outer side of the valve core. A plurality of downward-opening positioning grooves are evenly distributed along the circumference on the outer side of the lower end of the stator. A radially penetrating positioning hole is provided on the outer side of the valve seat corresponding to each positioning groove position. A positioning screw with its end located in the positioning groove at the corresponding position is fixedly installed in each positioning hole.

[0009] The above-mentioned driving component may include a connector, a driving motor, a transmission assembly, a main shaft and a driving housing. An inner ring platform is fixed to the inner side of the lower part of the valve seat corresponding to the position below the rotor. A plurality of liquid outlet holes that penetrate vertically are evenly distributed along the circumference on the upper end of the inner ring platform. A mounting hole that penetrates vertically is provided in the center of the inner ring platform. The lower end of the inner ring platform and the upper end of the hollow connector are fixedly mounted together. A main shaft whose upper end passes through the mounting hole and is fixedly mounted to the inner side of the rotor is sealingly rotatably mounted on the inner side of the connector. A driving housing is sealingly fixedly mounted on the lower end of the connector. The driving motor is sealingly fixedly mounted on the inner side of the lower part of the driving housing. The transmission assembly is installed in the driving housing between the connector and the driving motor. The upper end of the output shaft of the driving motor and the lower end of the main shaft are connected together through the transmission assembly.

[0010] The above-mentioned driving assembly may further include a power module and a control module. The driving housing includes a transmission housing and a driving housing. The inner side of the upper end of the transmission housing is fixedly and sealingly installed with the outer side of the lower end of the connecting head, and the inner side of the lower end of the transmission housing is fixedly and sealingly installed with the outer side of the upper end of the driving housing. The transmission assembly is installed in the transmission housing, and the driving motor, the control module, and the power module are installed in the driving housing at intervals from top to bottom. The power module is respectively connected to the control module and the driving motor, and the control module is connected to the driving motor.

[0011] The above-mentioned transmission assembly may include a first coupling, a second coupling, and a reducer. The reducer is fixedly installed on the inner side of the middle part of the transmission housing. The lower end of the input shaft of the reducer is drivingly connected to the upper end of the first coupling. The lower end of the first coupling and the upper end of the output shaft of the driving motor are drivingly connected through the second coupling. The upper end of the output shaft of the reducer is drivingly connected to the lower end of the main shaft.

[0012] The above-mentioned first coupling may be a magnetic coupling. The second coupling includes a fixing sleeve and fixing pins. A plurality of radially penetrating slots are evenly distributed along the circumference at the lower end of the first coupling. A fixing sleeve is fixedly installed on the outer side of the upper end of the output shaft of the driving motor. The upper end of the fixing sleeve is sleeved on the inner side of the lower part of the first coupling. Fixing pins are fixedly installed on the outer side of the fixing sleeve corresponding to each slot position, and each fixing pin is slidably installed in the corresponding slot; or the second coupling is a universal coupling.

[0013] The above-mentioned transmission assembly may further include a bearing, a connecting seat, and a torque transmission sleeve. A connecting seat with its lower end fixedly installed with the upper end of the reducer is sleeved on the inner side of the lower end of the connecting head. A torque transmission sleeve is rotatably installed in the connecting seat. A torque transmission hole that penetrates up and down and has a polygonal cross-section is provided on the inner side of the torque transmission sleeve. The cross-sections of the upper part of the output shaft of the reducer and the lower part of the main shaft are both polygonal and match the torque transmission hole. The outer side of the upper part of the output shaft of the reducer is installed on the inner side of the lower part of the torque transmission hole, and the outer side of the lower part of the main shaft is installed on the inner side of the upper part of the torque transmission hole. A bearing is coaxially sleeved between the inner side of the connecting head and the outer side of the main shaft at the upper end position of the connecting seat, and a locking nut sleeved on the inner side of the connecting seat is screwed on the outer side of the main shaft at the lower end position of the bearing.

[0014] The second technical solution of the present invention is achieved through the following measures: A continuous wave high-speed transmission method, including the following steps: Step 1, generate an original pressure signal. By controlling the driving assembly to drive the rotor to rotate, the difference between the third area and the second area changes periodically, so that the mud pressure flowing through the orifice changes, and the mud with pressure change circulates to the wellhead to generate the original pressure signal; Step 2, denoise the original pressure signal in Step 1 to generate a sine wave signal; Step 3, reconstruct the sine wave signal in Step 2 to facilitate identification as a binary signal.

[0015] The following is a further optimization and / or improvement of the second technical solution of the above invention: In the above step 2, the raw pressure signal in step 1 is denoised by a denoising processing algorithm, and the denoising processing algorithm includes pump noise elimination, signal reflection equalization, and signal filtering.

[0016] In the above step 3, the sine wave signal in step 2 is demodulated by phase shift keying and then the signal is reconstructed.

[0017] The structure of the present invention is reasonable and compact. When the rotor rotates driven by the driving component, when the mud flows through the flow hole and enters below the valve core, since the difference between the third area and the second area changes with the rotation of the rotor, the pressure of the mud changes, forming a pulse signal. In this way, when the mud circulates to the wellhead, the changing pressure is retained, so that the pressure change signal can be obtained, and data transmission can be realized through mud pulses. The difference between the third area and the second area is the same as the first area, and the frequency can be instantaneously changed. Compared with the traditional oscillating shear valve, the buffer time occupied during frequency change is saved, the transmission rate is increased, and a higher data density can be generated. Description of the Drawings

[0018] Attached Figure 1 It is a schematic front sectional view of Embodiment 1.

[0019] Attached Figure 2 It is a schematic top view of the stator in Embodiment 1.

[0020] Attached Figure 3 It is a schematic bottom view of the stator in Embodiment 1.

[0021] Attached Figure 4 It is a schematic three-dimensional view of the stator in Embodiment 1.

[0022] Attached Figure 5 It is a schematic top view of the rotor in Embodiment 1.

[0023] Attached Figure 6 It is a schematic bottom view of the rotor in Embodiment 1.

[0024] Attached Figure 7 It is a schematic three-dimensional view of the rotor in Embodiment 1.

[0025] Attached Figure 8 It is a schematic top view of the stator and the rotor when the first area is the largest in Embodiment 1.

[0026] Attached Figure 9 It is a schematic top view of the stator and the rotor when the second area is between the first area and the third area in Embodiment 1.

[0027] Attached Figure 10Schematic top view of the stator and rotor when the first area is minimized in the first embodiment.

[0028] Appendix Figure 11 Schematic top view of the valve seat in the first embodiment.

[0029] Appendix Figure 12 Schematic perspective view of the valve seat in the first embodiment.

[0030] Appendix Figure 13 Schematic perspective view of the fixing frame in the second embodiment. Appendix Figure 14 Original signal waveform diagram. Appendix Figure 15 Noise-reduced signal waveform diagram. Appendix Figure 16 Reconstructed signal waveform diagram.

[0031] The codes in the attached drawings are respectively: 1 is the valve seat, 2 is the stator, 3 is the rotor, 4 is the valve core, 5 is the flow-through hole, 6 is the fixing frame, 7 is the liquid inlet hole, 8 is the fishing anchor, 9 is the wear-resistant sleeve, 10 is the positioning groove, 11 is the connector, 12 is the drive motor, 13 is the main shaft, 14 is the inner ring platform, 15 is the liquid outlet hole, 16 is the power module, 17 is the control module, 18 is the reducer, 19 is the first coupling, 20 is the fixing sleeve, 21 is the fixing pin, 22 is the card slot, 23 is the bearing, 24 is the connecting seat, 25 is the torque transmission sleeve, 26 is the locking nut, 27 is the transmission housing, 28 is the drive housing. Detailed implementation manners

[0032] The present invention is not limited by the following embodiments, and the specific implementation manners can be determined according to the technical solutions of the present invention and the actual situation.

[0033] In the present invention, for the convenience of description, the description of the relative position relationship of each component is carried out according to the layout mode of the attached drawings of the specification. Figure 1 For example, the position relationships such as front, rear, upper, lower, left, and right are determined according to the layout direction of the attached drawings of the specification.

[0034] The present invention will be further described below in conjunction with the embodiments and the attached drawings: Embodiment 1: As shown in the appendix Figures 1 to 12As shown in the figure, the oscillating shear valve includes a valve seat 1, a stator 2, a rotor 3 and a driving assembly. The inner side of the upper part of the valve seat 1 is fixedly installed with the outer side of the upper end of the stator 2. A plurality of flow holes 5 penetrating up and down are evenly distributed along the circumference at the upper end of the stator 2. The rotor 3 is rotatably installed on the inner side of the valve seat 1 corresponding to the lower end position of the stator 2. A valve core 4 corresponding to the flow hole 5 is fixedly installed on the outer side of the upper end of the rotor 3. The overlapping area of the projection on the horizontal plane between the lower ends of two adjacent flow holes 5 and the projection on the horizontal plane of the corresponding valve core 4 is the first area. The overlapping area of the projection on the horizontal plane of the lower end of the flow hole 5 and the projection on the horizontal plane of the corresponding valve core 4 is the second area. The projected area of the lower end of the flow hole 5 on the horizontal plane is the third area. The difference between the third area and the second area is the same as the first area. A driving assembly capable of driving the rotor 3 to rotate is installed on the inner side of the lower part of the valve seat 1.

[0035] According to requirements, the rotor 3 and the valve core 4 are integrally arranged. During use, the driving assembly drives the rotor 3 to rotate. When the rotor 3 rotates and the mud flows through the flow hole 5 and into the lower part of the valve core 4, since the difference between the third area and the second area changes with the rotation of the rotor 3, the pressure of the mud changes, forming a pulse signal. In this way, when the mud circulates to the wellhead, the changing pressure is retained, so that a pressure change signal can be obtained. Signal transmission can be realized through mud pulses. The difference between the third area and the second area is the same as the first area, and the frequency can be instantaneously changed. Compared with the traditional oscillating shear valve, the buffer time occupied during frequency change is saved, the transmission rate is increased, and a higher data density can be generated.

[0036] According to actual needs, the above oscillating shear valve can be further optimized and / or improved: Embodiment 2: As an optimization of the above embodiment, as shown in FIGS. Figures 1 to 4 8 to 10, 13, the cross-sectional area of the flow hole 5 gradually decreases from top to bottom, and at least one side of the inner wall of the flow hole 5 is spirally arranged up and down. A fixing frame 6 is fixedly installed on the inner side of the upper end of the valve seat 1 corresponding to the upper end position of the stator 2. A plurality of liquid inlet holes 7 penetrating up and down are evenly distributed along the circumference on the upper side of the fixing frame 6. A fishing anchor 8 with its upper end located above the fixing frame 6 is fixedly installed in the center of the upper side of the fixing frame 6.

[0037] According to the requirements, the inner wall of the flow hole 5 includes a first side wall, a second side wall, a third side wall and a fourth side wall. The first side wall is arranged along the radial direction of the stator 2, the second side wall is arranged along the up-down spiral direction, the third side wall is in an arc shape with an opening facing inward, and the third side wall is connected to the first side wall and the second side wall on both sides by a transitional arc, and the fourth side wall is a vertical surface, and the fourth side wall is connected to the first side wall and the second side wall on both sides by a transitional arc. During use, the cross-sectional area of ​​the flow hole 5 gradually decreases from top to bottom, and at least one side of the inner wall of the flow hole 5 is arranged along the up-down spiral direction, which can further increase the pressure of the mud when it flows through the lower end of the lower flow hole 5, so that the pressure change of the mud is more obvious with the change of the first area. By setting a fixing frame 6, it is convenient to fix the stator 2, and a salvage anchor 8 is set to facilitate the connection between the valve seat 1 and the pipe string.

[0038] Embodiment 3: As an optimization of the above embodiment, as shown in the attached Figure 1 , 3 As shown in , 4, a wear-resistant sleeve 9 is installed between the inner side of the lower part of the valve seat 1 corresponding to the lower end position of the stator 2 and the outer side of the valve core 4, and a plurality of downward opening positioning grooves 10 are evenly distributed along the circumference of the outer side of the lower end of the stator 2. A radially penetrating positioning hole is provided on the outer side of the valve seat 1 corresponding to the position of each positioning groove 10, and a positioning screw with an end located in the corresponding position of the positioning groove 10 is fixedly installed in each positioning hole.

[0039] During use, by providing the wear-resistant sleeve 9, the wear degree of the valve seat 1 can be reduced, the service life of the valve seat 1 can be extended, and the maintenance cost can be reduced. By providing the positioning groove 10, the stator 2 can be easily fixed to prevent the relative rotation of the stator 2 and the rotor 3 during use, which will affect the abnormal change of the first area and thus affect the change law of the mud after flowing through the flow hole 5.

[0040] Embodiment 4: As an optimization of the above embodiment, as shown in the attached Figure 1 , 11 As shown in Figures 1 and 12, the drive assembly includes a connector 11, a drive motor 12, a transmission assembly, a main shaft 13 and a drive housing 28. An inner ring platform 14 is fixed to the inner side of the lower part of the valve seat 1 corresponding to the position below the rotor 3. A plurality of liquid outlet holes 15 are evenly distributed along the circumference at the upper end of the inner ring platform 14 and are connected vertically. A mounting hole that is connected vertically is provided in the center of the inner ring platform 14. The lower end of the inner ring platform 14 and the upper end of the hollow connector 11 are fixedly mounted together. The main shaft 13 is fixedly mounted on the inner side of the rotor 3 after the upper end passes through the mounting hole. The drive housing 28 is fixedly mounted on the lower end of the connector 11. The drive motor 12 is fixedly mounted on the inner side of the lower part of the drive housing 28. The transmission assembly is installed in the drive housing 28 between the connector 11 and the drive motor 12. The upper end of the output shaft of the drive motor 12 and the lower end of the main shaft 13 are connected together through the transmission assembly.

[0041] During use, with such a setting, the output shaft of the drive motor 12 can be synchronized with the main shaft 13, reducing the action delay of the rotor 3 and making the change in mud pressure synchronized with the change in the rotational speed of the output shaft of the drive motor 12.

[0042] Embodiment Five: As an optimization of the above embodiment, as shown in the appendix Figure 1 As shown, the drive assembly further includes a power module 16 and a control module 17. The drive housing includes a transmission housing 27 and a drive housing 28. The inner side of the upper end of the transmission housing 27 is fixedly and sealingly installed with the outer side of the lower end of the connector 11, and the inner side of the lower end of the transmission housing 27 is fixedly and sealingly installed with the outer side of the upper end of the drive housing 28. The transmission assembly is installed in the transmission housing 27, and the drive motor 12, the control module 17, and the power module 16 are installed at intervals from top to bottom in the drive housing 28. The power module 16 is respectively connected to the control module 17 and the drive motor 12, and the control module 17 is connected to the drive motor 12.

[0043] During use, by providing the transmission housing 27 and the drive housing 28, it is convenient for the modular assembly of the transmission assembly and the drive motor 12, reducing the difficulty of disassembly and assembly. Through the control module 17, signals underground can be transmitted to the control module 17, and then the rotational speed of the drive motor 12 can be controlled through the control module 17, so that the first area changes periodically. In this way, after the mud flows through the flow hole 5, the pressure changes, and the mud circulates to the wellhead, and the changed pressure of the mud can be analyzed to obtain underground parameters.

[0044] Embodiment Six: As an optimization of the above embodiment, as shown in the appendix Figure 1 As shown, the transmission assembly includes a first coupling 19, a second coupling, and a reducer 18. The reducer 18 is fixedly installed on the inner side of the middle part of the transmission housing 27. The lower end of the input shaft of the reducer 18 is drivingly connected to the upper end of the first coupling 19, and the lower end of the first coupling 19 and the upper end of the output shaft of the drive motor 12 are drivingly connected through the second coupling. The upper end of the output shaft of the reducer 18 is drivingly connected to the lower end of the main shaft 13.

[0045] During use, by providing the reducer 18, the rotational speed of the rotor 3 can be reduced, so that the pressure change is obvious after the mud flows through the flow hole 5, facilitating the subsequent reading and analysis of signals. By providing the first coupling 19 and the second coupling, the installation difficulty between the output shaft of the drive motor 12 and the input shaft of the reducer 18 can be reduced.

[0046] Embodiment Seven: As an optimization of the above embodiment, as shown in the appendix Figure 1As shown in the figure, the first coupling 19 is a magnetic coupling. The second coupling includes a fixed sleeve 20 and a fixed pin 21. A plurality of radially penetrating slots 22 are evenly distributed along the circumference at the lower end of the first coupling 19. A fixed sleeve 20 is fixedly installed on the outer side of the upper end of the output shaft of the driving motor 12. The upper end of the fixed sleeve 20 is sleeved inside the lower part of the first coupling 19. A fixed pin 21 is fixedly installed on the outer side of the fixed sleeve 20 corresponding to each slot 22. The outside of each fixed pin 21 is slidably installed in the corresponding slot 22.

[0047] According to requirements, the second coupling can also be a universal coupling. During use, by setting the magnetic coupling, the failure rate of the transmission assembly during downhole use can be reduced. At the same time, it can also prevent the spool 4 from being damaged due to excessive torque. By setting the second coupling, the vibration of the driving motor 12 can be reduced from causing vibration of the spool 4, the influence on the mud pressure can be reduced, and the transmission efficiency of the mud carrying pressure signal can be improved.

[0048] Embodiment Eight: As an optimization of the above embodiment, as shown in the appendix Figure 1 As shown in the figure, the transmission assembly further includes a bearing 23, a connection seat 24, and a torque transmission sleeve 25. A connection seat 24 with its lower end fixedly installed together with the upper end of the reducer 18 is sleeved inside the lower end of the connector 11. A torque transmission sleeve 25 is rotatably installed in the connection seat 24. A torque transmission hole that penetrates up and down and has a polygonal cross-section is provided inside the torque transmission sleeve 25. The upper cross-section of the output shaft of the reducer 18 and the lower cross-section of the main shaft 13 are both polygonal and match the torque transmission hole. The outer side of the upper part of the output shaft of the reducer 18 is installed inside the lower part of the torque transmission hole, and the outer side of the lower part of the main shaft 13 is installed inside the upper part of the torque transmission hole. A bearing 23 is coaxially sleeved between the inner side of the connector 11 corresponding to the upper end position of the connection seat 24 and the outer side of the main shaft 13. A locking nut 26 sleeved inside the connection seat 24 is screwed on the outer side of the main shaft 13 corresponding to the lower end position of the bearing 23.

[0049] According to requirements, the torque transmission sleeve 25 is provided with a torque transmission hole that penetrates up and down and has a regular hexagonal cross-section. The upper cross-section of the output shaft of the reducer 18 and the lower cross-section of the main shaft 13 are both regular hexagonal and match the torque transmission hole. During use, by setting the torque transmission sleeve 25, the torque of the output shaft of the reducer 18 can be transmitted to the main shaft 13, so that the output shaft of the driving motor 12 and the main shaft 13 rotate synchronously, reducing the action delay of the rotor 3, and making the change of the mud pressure synchronize with the rotation speed change of the output shaft of the driving motor 12. By setting the bearing 23, the main shaft 13 can rotate more flexibly inside the connector 11. By setting the connection seat 24 and the locking nut 26, the bearing 23 can be positioned.

[0050] Embodiment Nine: As an optimization of the above embodiment, as shown in the appendix Figures 1 to 16 As shown in the figure, the continuous wave high-speed transmission method includes the following steps: Step 1, generating an original pressure signal, by controlling the driving assembly to drive the rotor 3 to rotate, so that the difference between the third area and the second area changes periodically, thereby changing the pressure of the mud flowing through the flow hole 5, and the mud with changed pressure circulates to the wellhead to generate an original pressure signal; Step 2, denoising the original pressure signal in step 1 to generate a sine wave signal; Step three, reconstruct the sinusoidal wave signal in step two so as to facilitate identification as a binary signal.

[0051] In step 2, the original pressure signal in step 1 is denoised by a denoising algorithm, and the denoising algorithm includes pump noise elimination, signal reflection equalization and signal filtering; in step 3, the sinusoidal signal in step 2 is demodulated by phase shift keying to reconstruct the signal.

[0052] First, the control driving assembly drives the rotor 3 to rotate, so that the difference between the third area and the second area changes periodically, thereby changing the pressure of the mud flowing through the flow hole 5. The mud with changed pressure circulates to the wellhead, and the surface system obtains the pressure wave signal of the wellhead change through the sensor, and decodes it in real time to generate the original pressure signal, forming the following Figure 14 The original signal waveform is shown.

[0053] Then, the original pressure signal in step 1 is de-noised by a de-noising algorithm, which includes pump noise elimination, signal reflection equalization and signal filtering. The carrier modulated signal is formed as shown in the attached figure. Figure 15 The noise reduction signal waveform is shown.

[0054] Finally, the sinusoidal wave signal in step 2 is demodulated by phase shift keying and reconstructed to form the following signal: Figure 16 The reconstructed signal waveform is shown.

[0055] Attached Figure 15 The noise reduction signal waveform shown is a test signal with a data rate of 10bps and a carrier frequency of 30hz transmitted from a measurement depth of 5480m, and the effect diagram after noise reduction; Figure 16 The reconstructed signal waveform shown is from the attached Figure 15 The sine carrier modulated signal in the noise reduction signal waveform shown is reconstructed by shift keying demodulation. The beginning of each bit is represented by a red line, the horizontal line separates the binary 0 and the binary 1, and the middle of each bit is marked with a cross. Depending on whether the cross is above or below the horizontal line, 1 or 0 is decoded respectively, and the reconstructed signal can be easily identified as a binary signal. The invention has achieved a data transmission rate of up to 20 bit / s, which is more than 200% faster than the previous rotary shear valve.

[0056] The above technical features constitute an embodiment of the present invention, which has strong adaptability and implementation effects. Non-essential technical features can be increased or decreased according to actual needs to meet the requirements of different situations.

Claims

1. An oscillating shear valve, Features It includes a valve seat, a stator, a rotor and a driving assembly, the inner side of the upper part of the valve seat and the outer side of the upper end of the stator are fixedly installed together, the upper end of the stator is evenly spaced along the circumference with a plurality of flow holes that pass through up and down, a rotor is rotatably installed on the inner side of the valve seat corresponding to the lower end of the stator, a valve core corresponding to the flow hole is fixed on the outer side of the upper end of the rotor, the overlapping area of ​​the projection of the lower end of the stator on the horizontal plane between two adjacent flow holes and the projection of the corresponding valve core on the horizontal plane is the first area, the overlapping area of ​​the projection of the lower end of the flow hole on the horizontal plane and the projection of the corresponding valve core on the horizontal plane is the second area, the projection area of ​​the lower end of the flow hole on the horizontal plane is the third area, the difference between the third area and the second area is the same as the first area, and a driving assembly that can drive the rotor to rotate is installed on the inner side of the lower part of the valve seat.

2. The oscillating shear valve according to claim 1, Features The cross-sectional area of ​​the flow hole gradually decreases from top to bottom, and at least one side of the inner wall of the flow hole is spirally arranged in the up-down direction; a fixing frame is fixedly installed on the inner side of the upper end of the valve seat corresponding to the upper end position of the stator, and a plurality of liquid inlet holes that penetrate up and down are evenly distributed along the circumference on the upper side of the fixing frame; a salvage anchor with its upper end located above the fixing frame is fixedly installed in the center of the upper side of the fixing frame; or / and, a wear-resistant sleeve is sleeved between the inner side of the lower part of the valve seat corresponding to the lower end position of the stator and the outer side of the valve core, and a plurality of positioning grooves opening downward are evenly distributed along the circumference on the outer side of the lower end of the stator, and a radially penetrating positioning hole is provided on the outer side of the valve seat corresponding to each positioning groove position, and a positioning screw with its end located in the positioning groove at the corresponding position is fixedly installed in each positioning hole.

3. The oscillating shear valve according to claim 1 or 2, Features The driving component includes a connector, a driving motor, a transmission assembly, a main shaft and a driving housing. An inner ring platform is fixed to the inner side of the lower part of the valve seat corresponding to the position below the rotor. A number of liquid outlet holes that penetrate vertically are evenly distributed along the circumference on the upper end of the inner ring platform. A mounting hole that penetrates vertically is provided in the center of the inner ring platform. The lower end of the inner ring platform and the upper end of the hollow connector are fixedly mounted together. The inner side of the connector is sealed and rotatably mounted with a main shaft whose upper end passes through the mounting hole and is fixedly mounted to the inner side of the rotor. The lower end of the connector is sealed and fixedly mounted with a driving housing. The driving motor is sealed and fixedly mounted on the inner side of the lower part of the driving housing. The transmission assembly is installed in the driving housing between the connector and the driving motor. The upper end of the output shaft of the driving motor and the lower end of the main shaft are connected together through the transmission assembly.

4. The oscillating shear valve according to claim 3, Features The drive component also includes a power module and a control module. The drive housing includes a transmission housing and a drive housing. The inner side of the upper end of the transmission housing and the outer side of the lower end of the connector are sealed and fixed together. The inner side of the lower end of the transmission housing and the outer side of the upper end of the drive housing are sealed and fixed together. The transmission assembly is installed in the transmission housing. The drive motor, control module and power module are installed in the drive housing from top to bottom. The power module is respectively connected to the control module and the drive motor, and the control module is connected to the drive motor.

5. The oscillating shear valve according to claim 4, Features The transmission assembly includes a first coupling, a second coupling, and a speed reducer. The speed reducer is fixedly installed inside the middle of the transmission housing. The lower end of the input shaft of the speed reducer is drivingly connected to the upper end of the first coupling. The lower end of the first coupling is drivingly connected to the upper end of the output shaft of the driving motor through the second coupling. The upper end of the output shaft of the speed reducer is drivingly connected to the lower end of the main shaft.

6. The oscillating shear valve according to claim 5, wherein the first coupling is a magnetic coupling, the second coupling includes a fixing sleeve and fixing pins. A plurality of radially penetrating slots are evenly distributed at intervals along the circumference at the lower end of the first coupling. A fixing sleeve is fixedly installed on the outer side of the upper end of the output shaft of the driving motor. The upper end of the fixing sleeve is sleeved inside the lower part of the first coupling. Fixing pins are fixedly installed on the outer side of the fixing sleeve corresponding to each slot position. Each fixing pin is slidably installed in the corresponding slot; or the second coupling is a universal coupling.

7. The oscillating shear valve according to claim 5 or 6, wherein the transmission assembly further includes a bearing, a connecting seat, and a torque transmission sleeve. The inner side of the lower end of the connecting head is sleeved with a connecting seat whose lower end is fixedly installed together with the upper end of the speed reducer. A torque transmission sleeve is rotatably installed in the connecting seat. A torque transmission hole that penetrates up and down and has a polygonal cross-section is provided inside the torque transmission sleeve. The cross-sections of the upper part of the output shaft of the speed reducer and the lower part of the main shaft are both polygonal and match the torque transmission hole. The outer side of the upper part of the output shaft of the speed reducer is installed inside the lower part of the torque transmission hole, and the outer side of the lower part of the main shaft is installed inside the upper part of the torque transmission hole. A bearing is coaxially sleeved between the inner side of the connecting head and the outer side of the main shaft corresponding to the upper end position of the connecting seat. A locking nut sleeved inside the connecting seat is screwed on the outer side of the main shaft corresponding to the lower end position of the bearing.

8. A continuous wave high-speed transmission method using the oscillating shear valve according to any one of claims 1 to 7, wherein it includes the following steps: Step 1, generate an original pressure signal. Drive the rotor to rotate by controlling the driving component, so that the difference between the third area and the second area changes periodically, thereby causing the pressure of the mud flowing through the flow hole to change. The mud with the pressure change circulates to the wellhead to generate the original pressure signal; Step 2, denoise the original pressure signal in Step 1 to generate a sine wave signal; Step 3, reconstruct the sine wave signal in Step 2 to facilitate identification as a binary signal.

9. The continuous wave high-speed transmission method according to claim 8, wherein in Step 2, the original pressure signal in Step 1 is denoised by a denoising processing algorithm. The denoising processing algorithm includes pump noise elimination, signal reflection equalization, and signal filtering.

10. The continuous wave high-speed transmission method according to claim 8 or 9, wherein in Step 3, the sine wave signal in Step 2 is reconstructed through phase shift keying demodulation.

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