Mud pressure wave signal modulation device and method

Abstract

The present invention discloses a mud pressure wave signal modulation device and method, which relates to the technical field of oil drilling engineering; wherein the device includes: a motor, a valve plate, a main control circuit, a motor drive control circuit, and a downhole communication circuit; wherein the valve plate can rotate around an axial direction perpendicular to the flow direction of the drilling fluid under the drive of the motor; the motor and the valve plate are arranged in a drilling fluid channel, and the drilling fluid channel, the motor, the valve plate, the main control circuit, the motor drive control circuit, and the downhole communication circuit are arranged in a drill collar. In this way, the motor is directly connected to the valve plate, which can directly drive the valve plate to rotate, and the valve plate can rotate around an axial direction perpendicular to the flow direction of the drilling fluid under the drive of the motor, with fast response and direct action, which increases the torque of the motor driving the valve plate to rotate, reduces energy consumption, and improves the utilization rate of electric energy.

Description

Technical Field

[0001] The invention relates to the technical field of oil drilling engineering, and in particular to a mud pressure wave signal modulation device and method. Background Art

[0002] This section is intended to provide a background or context to the embodiments of the invention recited in the claims. No admission is made that the description herein is prior art by inclusion in this section.

[0003] Efficient and safe drilling and precise geological guidance are inseparable from real-time downhole measurement information. With the emergence of new downhole measurement instruments, the number of measurement parameters is increasing day by day, from the initial geometric parameter measurement instruments such as well inclination, azimuth, tool face to drilling pressure, torque, bending moment, vibration, speed, pressure, temperature, natural gamma, resistivity, neutron density, hydrogen index and other engineering / geological parameter measurement instruments. The amount of downhole information that needs to be transmitted has expanded dramatically, but the data transmission rate of the existing conventional telemetry system is low, which is difficult to meet the real-time transmission requirements of multiple parameters, and has become a bottleneck for the sustainable development of advanced measurement while drilling technology.

[0004] The mud pulse modulation device is one of the key core technologies of the high-speed teletransmission system. When transmitting information, the existing mud pulse modulation device mainly changes the pressure on the valve plate by rotating the valve plate in the drilling fluid, and transmits information through pressure changes. However, the existing mud pulse modulation devices mainly use shear valves or rotary valves. Both valve plates are perpendicular to the flow direction of the drilling fluid, and the valve plates rotate around the axial section parallel to the flow direction of the drilling fluid. These two valve plates need to be driven by a motor to rotate a rod parallel to the flow direction of the drilling fluid. The rotation of this rod then drives the valve plate to rotate, which has a slow response, a small torque acting on the valve plate, high energy consumption, and low power utilization. Summary of the invention

[0005] The embodiment of the present invention provides a mud pressure wave signal modulation device, which is used to improve the response speed, increase the torque of the motor driving the valve plate to rotate, reduce energy consumption, and improve the utilization rate of electric energy. The device includes: a motor, a valve plate, a main control circuit, a motor drive control circuit, and a downhole communication circuit;

[0006] The valve plate can rotate around an axial direction perpendicular to the flow direction of the drilling fluid under the drive of the motor, and the valve plate can form a cross section that controls the actual flow channel size of the drilling fluid in the drilling fluid channel through the rotation of the valve plate; the motor and the valve plate are arranged in the drilling fluid channel, and the drilling fluid channel, the main control circuit, the motor drive control circuit, and the downhole communication circuit are arranged in the drill collar;

[0007] The main control circuit is used to receive downhole measurement while drilling data sent by the downhole communication circuit. When it is determined according to a preset program that the downhole measurement while drilling data needs to be transmitted to the ground, the main control circuit generates a control timing according to the motor data provided by the motor drive control circuit, the valve plate angle information provided by the downhole communication circuit, and the preset working mode, and sends the control timing to the motor drive control circuit so that the motor drive control circuit controls the motor to work in the preset working mode.

[0008] The embodiment of the present invention provides a mud pressure wave signal modulation method, which is applied to the main control circuit in the above embodiment to improve the response speed, increase the torque of the motor driving the valve plate to rotate, reduce energy consumption, and improve the utilization rate of electric energy. The method includes:

[0009] Receiving downhole measurement while drilling data sent by the downhole communication circuit, and when determining according to a preset program that the downhole measurement while drilling data needs to be transmitted to the surface, generating a control sequence according to the motor data provided by the motor drive control circuit, the angle information of the valve plate provided by the downhole communication circuit, and the preset working mode;

[0010] The control timing is sent to the motor drive control circuit so that the motor drive control circuit controls the motor to work in a preset working mode.

[0011] An embodiment of the present invention further provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned mud pressure wave signal modulation method when executing the computer program.

[0012] An embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the above-mentioned mud pressure wave signal modulation method is implemented.

[0013] An embodiment of the present invention further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the above-mentioned mud pressure wave signal modulation method is implemented.

[0014] In an embodiment of the present invention, a mud pressure wave signal modulation device is provided, comprising: a motor, a valve plate, a main control circuit, a motor drive control circuit, and a downhole communication circuit; wherein the valve plate can rotate around an axial direction perpendicular to the flow direction of the drilling fluid under the drive of the motor, and the valve plate can form a cross-section that controls the actual flow channel size of the drilling fluid in the drilling fluid channel through the rotation of the valve plate; the motor and the valve plate are arranged in the drilling fluid channel, and the drilling fluid channel, the motor, the valve plate, the main control circuit, the motor drive control circuit, and the downhole communication circuit are arranged in the drill collar; the main control circuit is used to receive downhole measurement while drilling data sent by the downhole communication circuit, and when it is determined according to a preset program that the downhole measurement while drilling data needs to be transmitted to the ground, a control sequence is generated according to the motor data provided by the motor drive control circuit, the angle information of the valve plate provided by the downhole communication circuit, and the preset working mode, and the control sequence is sent to the motor drive control circuit, so that the motor drive control circuit controls the motor to work in the preset working mode. In this way, the motor is directly connected to the valve plate, which can directly drive the valve plate to rotate. Driven by the motor, the valve plate can rotate around an axis perpendicular to the flow direction of the drilling fluid. It has a fast response and direct action, which increases the torque of the motor to drive the valve plate to rotate, reduces energy consumption, and improves the utilization rate of electric energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0016] Figure 1 A schematic diagram of a well site system provided in an embodiment of the present invention;

[0017] Figure 2 A schematic diagram of the connection between a motor and a valve plate of a mud pressure wave signal modulation device provided in an embodiment of the present invention;

[0018] Figure 3 for Figure 2 A schematic diagram showing the connection between the motor and the valve plate from another perspective;

[0019] Figure 4 A communication principle diagram between various parts of a mud pressure wave signal modulation device provided in an embodiment of the present invention;

[0020] Figure 5 A diagram showing valve periodic motion and mud pulse signal generation corresponding to a working mode 1 provided in an embodiment of the present invention;

[0021] Figure 6It is a schematic axial cross-sectional view of a mud pressure wave signal modulation device provided in an embodiment of the present invention;

[0022] Figure 7 It is a schematic axial cross-sectional view of a mud pressure wave signal modulation device provided in an embodiment of the present invention;

[0023] Figure 8 A diagram showing valve periodic motion and mud pulse signal generation corresponding to a second working mode provided in an embodiment of the present invention;

[0024] Fig. 9 The mud pressure wave signal modulation device provided in the embodiment of the present invention is based on Figure 4 The working principle diagram of the communication principle shown in the figure;

[0025] Fig.10 The present invention provides a flow chart of a method for modulating a mud pressure wave signal in accordance with an embodiment of the present invention. DETAILED DESCRIPTION

[0026] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0027] The term "and / or" herein only describes an association relationship, indicating that three relationships may exist. For example, A and / or B may represent the following three situations: A exists alone, A and B exist at the same time, and B exists alone. In addition, the term "at least one" herein represents any combination of at least two of any one or more of a plurality of. For example, including at least one of A, B, and C may represent including any one or more elements selected from the set consisting of A, B, and C.

[0028] In the description of this specification, the terms "include", "including", "have", "contain", etc. are all open terms, which mean including but not limited to. The descriptions with reference to the terms "one embodiment", "a specific embodiment", "some embodiments", "for example", etc. mean that the specific features, structures or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. The order of steps involved in each embodiment is used to schematically illustrate the implementation of the present application, and the order of steps is not limited and can be appropriately adjusted as needed.

[0029] Research has found that efficient and safe drilling and precise geological guidance are inseparable from real-time downhole measurement information. With the emergence of new downhole measuring instruments, the number of measurement parameters is increasing. From the initial geometric parameter measuring instruments such as well inclination, azimuth, and tool face to drilling pressure, torque, bending moment, vibration, rotation speed, pressure, temperature, natural gamma, resistivity, neutron density, hydrogen index and other engineering / geological parameter measuring instruments, the amount of downhole information that needs to be transmitted has expanded dramatically. However, the data transmission rate of the existing conventional teletransmission system is low, which is difficult to meet the real-time transmission requirements of multiple parameters. It has become a bottleneck for the sustainable development of advanced measurement while drilling technology. The mud pulse modulation device is one of the key core technologies of the high-speed teletransmission system. When transmitting information, the existing mud pulse modulation device mainly changes the pressure on the valve plate by rotating the valve plate in the drilling fluid, and transmits information through pressure changes. However, existing mud pulse modulation devices mainly use shear valves or rotary valves. Both valve plates are perpendicular to the flow direction of the drilling fluid, and the valve plates rotate around an axial section parallel to the flow direction of the drilling fluid. These two valve plates require a motor to rotate a rod parallel to the flow direction of the drilling fluid, and the rotation of the rod in turn drives the valve plate to rotate. The response is slow, the torque acting on the valve plate is small, the energy consumption is large, and the electric energy utilization rate is low.

[0030] In view of the above research, an embodiment of the present invention provides a mud pressure wave signal modulation device, including: a motor, a valve plate, a main control circuit, a motor drive control circuit, a downhole communication circuit, and a motor torque output shaft;

[0031] The valve plate can rotate around an axial direction perpendicular to the flow direction of the drilling fluid under the drive of the motor, and the valve plate can form a cross section that controls the actual flow channel size of the drilling fluid in the drilling fluid channel through the rotation of the valve plate; the motor and the valve plate are arranged in the drilling fluid channel, and the drilling fluid channel, the main control circuit, the motor drive control circuit, and the downhole communication circuit are arranged in the drill collar;

[0032] The main control circuit is used to receive downhole measurement while drilling data sent by the downhole communication circuit. When it is determined according to a preset program that the downhole measurement while drilling data needs to be transmitted to the ground, the main control circuit generates a control timing according to the motor data provided by the motor drive control circuit, the angle information of the valve plate provided by the downhole communication circuit, and the preset working mode, and sends the control timing to the motor drive control circuit so that the motor drive control circuit controls the motor to work in the preset working mode.

[0033] In the embodiment of the present invention, the motor is directly connected to the valve plate, which can directly drive the valve plate to rotate. The valve plate can rotate around an axis perpendicular to the flow direction of the drilling fluid under the drive of the motor. It has a fast response and direct action, which increases the torque of the motor to drive the valve plate to rotate, reduces energy consumption, and improves the utilization rate of electric energy.

[0034] The above-mentioned mud pressure wave signal modulation device is introduced in detail below.

[0035] The mud pressure wave signal modulation device described in the embodiment of the present invention can be used in well site systems in various oil drilling scenarios. Figure 1 FIG. 1 is a schematic diagram of a well site system provided by an embodiment of the present invention. The mud pressure wave signal modulation device provided by an embodiment of the present invention can be applied to the well site system, such as Figure 1 As shown, the well site system includes, for example: a riser 101, a ground system 102, a pressure sensor 103, a hose 104, a mud channel 105 in the drill string, an annulus 106 between the drill string and the well wall, and a mud pressure wave signal modulation device 107 and a drill bit 108 for rock breaking provided in an embodiment of the present invention.

[0036] Here, Figure 1 This is only one possible application scenario of the mud pressure wave signal modulation device provided in the embodiment of the present invention, and is not intended to limit the application of the mud pressure wave signal modulation device provided in the embodiment of the present invention to this scenario.

[0037] The mud pressure wave signal modulation device described in the embodiment of the present invention includes: a motor, a valve plate, a main control circuit 23, a motor drive control circuit, a downhole communication circuit, and a motor torque output shaft; the motor and the valve plate are arranged in a drilling fluid channel, and the drilling fluid channel, the main control circuit, the motor drive control circuit, and the downhole communication circuit are arranged in a drill collar; the valve plate can rotate around an axial direction perpendicular to the flow direction of the drilling fluid under the drive of the motor, and the rotation of the valve plate can form a cross-section that controls the actual flow channel size of the drilling fluid in the drilling fluid channel.

[0038] Here, the motor may be, for example, a servo motor, and the main control circuit may be composed of, for example, a DSP, an FPGA, and various discrete components.

[0039] In addition, the valve plate includes, for example, an arc-shaped valve plate, and the cross-section formed by the arc-shaped valve plate can block the flow of drilling fluid in the drilling fluid channel when it is rotated to be perpendicular to the direction of the drilling fluid. When the cross-section formed by the arc-shaped valve plate is rotated to be parallel to the direction of the drilling fluid, the actual flow channel of the drilling fluid in the drilling fluid channel is maximized.

[0040] In one embodiment of the present invention, the mud pressure wave signal modulation device also includes: a motor torque output shaft; the motor torque output shaft is perpendicular to the flow direction of the drilling fluid, and the valve plate is connected to the motor through the motor torque output shaft and can rotate around the motor torque output shaft under the drive of the motor.

[0041] For example, Figure 2As shown, it is a connection diagram of the motor and valve plate of a mud pressure wave signal modulation device provided by an embodiment of the present invention, wherein 2 is a drilling fluid channel, 3 is an arc valve plate, 5 is a motor, 1 and 6 are connectors, which provide channels for downhole power supply and communication cables, 4 is a motor torque output shaft, which fastens the motor 5 to the arc valve plate 3, the direction of the arrow is the flow direction of the drilling fluid, and the motor torque output shaft 4 is perpendicular to the flow direction of the drilling fluid.

[0042] In order to better illustrate the connection method and rotation method of the motor torque output shaft 4, the motor 5, and the arc valve plate 3, as shown in FIG. Figure 3 As shown, Figure 2 A connection diagram of the motor and the valve plate from another perspective, 3 is an arc-shaped valve plate, 5 is a motor, and 4 is a motor torque output shaft. The motor 5 drives the arc-shaped valve plate 3 to rotate through the torque output shaft 4. The arc-shaped valve plate 3 rotates around an axial direction perpendicular to the flow direction of the drilling fluid (motor torque output shaft 4). When the cross-section formed by the arc-shaped valve plate rotates to be perpendicular to the drilling fluid direction, the flow of drilling fluid in the drilling fluid channel can be blocked. When the cross-section formed by the arc-shaped valve plate rotates to be parallel to the drilling fluid direction, the actual flow channel of the drilling fluid in the drilling fluid channel is the largest. The angle of the valve plate cross-section can be adjusted by adjusting the rotation angle of the valve plate, thereby regulating the size of the actual flow channel of the drilling fluid in the drilling fluid channel.

[0043] Here, Figure 2 , Figure 3 This is just an example of a motor and a valve plate. The motor in the mud pressure wave signal modulation device provided in the embodiment of the present invention may also be connected to the valve plate through other smaller devices, which is not limited here.

[0044] The execution principles of each part of the mud pressure wave signal modulation device are as follows:

[0045] The main control circuit receives the downhole measurement while drilling data sent by the downhole communication circuit, and when it is determined according to the preset program that the downhole measurement while drilling data needs to be transmitted to the ground, generates a control timing according to the motor data provided by the motor drive control circuit, the angle information of the valve plate provided by the downhole communication circuit, and the preset working mode, and sends the control timing to the motor drive control circuit so that the motor drive control circuit controls the motor to work in the preset working mode.

[0046] Here, the motor data includes at least one of position information, coil temperature, rotor speed, motor fault code, etc.; the measurement data while drilling includes, for example: well inclination, azimuth, tool face, etc.; the motor data provided by the downhole communication circuit can be sent to the main control circuit through the downhole communication circuit.

[0047] Specifically, in one embodiment of the present invention, the mud pressure wave signal modulation device also includes: a data processing and storage circuit. When the main control circuit receives the downhole measurement while drilling data sent by the downhole communication circuit, it can determine whether the downhole measurement while drilling data needs to be sent to the ground according to a preset program. When it does not need to be sent to the ground, the main control circuit stores the downhole measurement while drilling data in the data processing and storage circuit. When it is necessary to send the downhole measurement while drilling data to the ground, the downhole measurement while drilling data is read from the data processing and storage circuit.

[0048] In addition, in one embodiment of the present invention, the mud pressure wave signal modulation device also includes: a power conversion circuit; the first end of the power conversion circuit is connected to the main control circuit, and the second end of the power conversion circuit is connected to the motor drive control circuit; the main control circuit generates a control timing according to the motor data provided by the motor drive control circuit, the angle information of the valve plate provided by the downhole communication circuit, and the preset working mode, and sends the control timing to the motor drive control circuit, so that when the motor drive control circuit controls the motor to work in the preset working mode, if the motor drive control circuit has not been started, the power conversion circuit is controlled to supply power to the motor drive control circuit; after power supply, the control timing is generated according to the motor data provided by the motor drive control circuit, the angle information of the valve plate provided by the downhole communication circuit, and the preset working mode, and the control timing is sent to the motor drive control circuit, and when it is no longer necessary to continue to transmit the downhole measurement while drilling data to the ground, the power conversion circuit is controlled to stop supplying power to the motor drive control circuit.

[0049] For example, Figure 4 The communication principle diagram between the various parts of a mud pressure wave signal modulation device provided by an embodiment of the present invention is as follows: when the downhole turbine generator is working, the downhole power conversion circuit is powered, and the maximum power is 800W. The power conversion circuit converts the voltage provided by the turbine generator, and after converting it into 5V voltage, it supplies power to the main control circuit. The main control circuit can receive the motor data, valve plate angle information, and drilling measurement data sent by the downhole communication circuit, and when the drilling measurement data does not need to be sent to the ground, the drilling measurement data can be stored in the data processing and storage circuit. When it needs to be sent (for example, when receiving a ground instruction to send the drilling measurement data), the drilling measurement data can be sent to the ground. The method comprises the steps of: first, a control circuit is used to control the motor drive control circuit and the motor drive control circuit to start the motor drive control circuit, and then the motor drive control circuit is used to control the motor drive control circuit to start the motor drive control circuit. The control circuit is used to control the motor drive control circuit to start the motor drive control circuit and start the motor drive control circuit. The control circuit is used to control the motor drive control circuit to start the motor drive control circuit and start the motor drive control circuit. The control circuit is used to control the motor drive control circuit to start the motor drive control circuit and start the motor drive control circuit. The control circuit is used to control the motor drive control circuit to start the motor drive control circuit and start the motor drive control circuit. The control circuit is used to control the motor drive control circuit to start the motor drive control circuit and start the motor drive control circuit. The control circuit is used to control the motor drive control circuit to start the motor drive control circuit and start the motor drive control circuit. The control circuit is used to control the motor drive control circuit to start the motor drive control circuit and start the motor drive control circuit.

[0050] Here, the preset working modes include, for example: Mode 1: the motor rotates continuously, and the valve plate rotates in a complete circle along with the motor, and one complete circle rotation is one motor working cycle.

[0051] In this mode, the signal amplitude variation curve generated by the mud pressure wave signal modulation device through the rotation of the valve plate approaches a sine waveform, such as Figure 5 As shown in the figure, 501 is the initial position of the valve plate. When the motor drives the valve plate to move 90° clockwise to position 502, the drilling fluid channel pressure is the largest, and the signal amplitude is also the largest. Then, when the motor drives the valve plate to move to 180°, i.e., position 503, the signal amplitude returns to zero. When it moves 270°, i.e., position 504, the signal amplitude reaches the second maximum value. It continues to rotate to 360°, i.e., returns to the original position, and the signal amplitude returns to zero again. When modulating the signal, 501-503 can be regarded as a complete cycle, i.e., half of the sine waveform can be regarded as a complete signal, or 501-503-501 can be regarded as a complete cycle, i.e., the entire sine waveform can be regarded as a complete signal. The advantage of using 501-503 as a complete cycle is that the modulation time is shortened by half and the modulation efficiency is doubled, but it is easily affected by noise and causes bit errors.

[0052] In addition, in another embodiment of the present invention, a torsion spring is further provided on the motor torque output shaft, such as Figure 6 As shown, it is an axial cross-sectional schematic diagram of the mud pressure wave signal modulation device provided by an embodiment of the present invention, wherein 7 is a pressure-resistant casing, which is a mechanical carrier of the mud pressure wave signal modulation device and is used for pressure-bearing and anti-corrosion protection mechanisms; 8 and 9 are power supply and communication cables; 10 is a fixing bolt used to connect the motor torque output shaft 4 and the valve plate 3; 11 is a sealing end cover used to maintain the positive pressure seal of the motor cabin; 12 and 19 are cabin shells; 13 is a motor stator coil; 14 and 18 are rotor poles, and 15 is a rotor mechanical skeleton; 16 is a torsion spring; 17 is a supporting structure; 20 is a sealed bearing; 21 is a spring support device; as shown in FIG. Figure 7 : is a radial cross-sectional diagram of a mud pressure wave signal modulation device. The first end of the torsion spring 16 is connected to the motor torque output shaft 4, and the second end of the torsion spring is connected to the valve plate 3 (not shown in the figure). Therefore, the preset working mode also includes, for example:

[0053] Mode 2: The motor works intermittently. After the motor drives the valve plate to deflect from the initial position to the first preset direction to the first preset angle, the motor stops working. The valve plate moves in the direction opposite to the first preset direction under the action of the torsion spring. When the valve plate moves to the initial position, the motor continues to work and drives the valve plate to deflect in the direction opposite to the first preset direction to the first preset angle. After that, the motor stops working. The valve plate moves in the first preset direction under the action of the torsion spring. Returning to the initial position is one motor working cycle.

[0054] In this mode, the signal amplitude variation curve generated by the mud pressure wave signal modulation device through the valve plate rotation also approaches a sine waveform, such as Figure 8 As shown, the initial position of the valve plate is 801. The motor drives the valve plate to rotate clockwise from position 801 to position 802 through an angle. The motor stops outputting torque. When the valve plate rebounds counterclockwise to position 803 under the action of the torsion spring, the motor resumes working and applies counterclockwise torque to drive the valve plate to move counterclockwise to position 804. The motor stops working and the valve plate rebounds clockwise to the initial position 801 again under the action of the torsion spring, and the signal amplitude returns to zero again. Similarly, in this embodiment, 801-803 can be regarded as a complete cycle, or 801-803-801 can be regarded as a complete cycle. The former still has the advantage of shortening the modulation time by half and doubling the modulation efficiency, but it is more susceptible to noise and causes bit errors.

[0055] Mode 3: The motor works intermittently. After the motor drives the valve plate to deflect from the initial position to the second preset direction to the second preset angle, the motor stops working. The valve plate swings back and forth in the second preset direction and the direction opposite to the second preset direction under the action of the torsion spring until it finally stops at the initial position, which is one motor working cycle.

[0056] In this mode, the mud pressure wave signal modulation device generates a series of oscillating pressure wave signals with gradually attenuated amplitudes through the rotation of the valve plate.

[0057] The above three working modes can meet different application scenarios respectively. When working in mode 2, the valve plate does not need to rotate 360°, but only needs to swing a very small angle (such as between 12.5° and 25°) to complete the modulation of the signal. The time required to complete a working cycle is the least, but at the same time, due to the small swing amplitude of the valve plate, the amplitude change of the pulse signal is also smaller than that of mode 1, and the requirements for ground decoding are higher. When working in mode 3, the modulation cycle of a pulse signal is composed of a series of oscillating waveforms with gradually decaying amplitudes. The working cycle is the longest, but at the same time, its signal is least likely to be misjudged or misidentified, and its reliability is the highest among the three modes. Therefore, when applying, shallow wells can consider using mode 2 to increase the downhole information transmission rate. When operating in deep wells and ultra-deep wells, mode 1 or mode 3 can be used to effectively ensure the signal transmission quality.

[0058] In addition, the preset working mode of the motor of the mud pressure wave signal modulation device can be changed according to the instructions from the ground. In one embodiment of the present invention, when the main control circuit receives the working mode switching instruction sent from the ground, it generates a control timing based on the motor data provided by the motor drive control circuit, the angle information of the valve plate provided by the downhole communication circuit, and the switched working mode, and sends the control timing to the motor drive control circuit, so that the motor drive control circuit controls the motor to work in the switched working mode.

[0059] In order to better understand the working principle of each part in the mud pressure wave signal modulation device, an example is given below to illustrate: Fig. 9 The mud pressure wave signal modulation device provided in the embodiment of the present invention is based on Figure 4 The working principle diagram of the communication principle shown in the figure includes:

[0060] S901: The main control circuit receives downhole measurement while drilling data sent by the downhole communication circuit;

[0061] S902: The main control circuit determines whether the measurement while drilling data needs to be sent to the surface according to a preset program, and if so, jumps to S905, and if not, jumps to S903;

[0062] S903: If it is not necessary to transmit the downhole measurement while drilling data to the surface, the main control circuit stores the measurement while drilling data to the data processing and storage circuit;

[0063] S904: When it is necessary to send the downhole measurement while drilling data to the surface, the main control circuit reads the downhole measurement while drilling data from the data processing and storage circuit;

[0064] S905: When the downhole measurement while drilling data needs to be transmitted to the surface, the main control circuit generates a control sequence according to the motor data provided by the motor drive control circuit, the angle information of the valve plate provided by the downhole communication circuit, and the preset working mode and sends it to the motor drive control circuit;

[0065] S906: the main control circuit controls the motor drive control circuit according to the control timing to control the motor to work in a preset working mode;

[0066] S907: The main control circuit determines whether to continue to transmit data, if yes, it returns to S902, if not, it jumps to S908;

[0067] S908: The main control circuit turns off the switch that the power conversion circuit uses to supply power to the motor drive control circuit, and stops the motor from working.

[0068] In addition, in one embodiment of the present invention, Figure 4 As shown, the downhole communication circuit can also send real-time monitoring data to the main control circuit; the main control circuit receives the downhole real-time monitoring data sent by the downhole communication circuit, and when receiving the ground instruction to send the downhole real-time monitoring data to the ground, it generates a control timing according to the motor data provided by the motor drive control circuit, the angle information of the valve plate provided by the downhole communication circuit, and the preset working mode, and sends the control timing to the motor drive control circuit, so that the motor drive control circuit controls the motor to work in the preset working mode.

[0069] The present invention also provides a mud pressure wave signal modulation method applied to the main control circuit described in the present invention, as described in the following embodiments. Since the principle of solving the problem by this method is similar to that of the mud pressure wave signal modulation device, the implementation of this method can refer to the implementation of the mud pressure wave signal modulation device, and the repeated parts will not be repeated.

[0070] like Fig.10 FIG. 1 is a flow chart of a method for modulating a mud pressure wave signal provided by an embodiment of the present invention, comprising:

[0071] S1001: receiving downhole measurement while drilling data sent by the downhole communication circuit, and when it is determined according to a preset program that the downhole measurement while drilling data needs to be transmitted to the surface, generating a control sequence according to the motor data provided by the motor drive control circuit, the angle information of the valve plate provided by the downhole communication circuit, and the preset working mode;

[0072] S1002: Sending a control sequence to a motor drive control circuit so that the motor drive control circuit controls the motor to operate in a preset operating mode.

[0073] In a possible implementation, the mud pressure wave signal modulation device also includes a motor torque output shaft, and a torsion spring is also arranged on the motor torque output shaft. When the first end of the torsion spring is connected to the motor torque output shaft and the second end of the torsion spring is connected to the valve plate, the preset working mode includes any one of the following modes: Mode 1: The motor rotates continuously, and the valve plate rotates with the motor in a complete circular motion, and one complete circle rotation is one motor working cycle; Mode 2: The motor works intermittently, and after the motor drives the valve plate to deflect from the initial position to the first preset direction to the first preset angle, the motor stops working, and the valve plate rotates in a torque Under the action of the torsion spring, the valve plate moves in the direction opposite to the first preset direction. When the valve plate moves to the initial position, the motor continues to work and drives the valve plate to deflect in the direction opposite to the first preset direction to the first preset angle. Then the motor stops working. The valve plate moves in the first preset direction under the action of the torsion spring, and returns to the initial position, which is one motor working cycle. Mode three: The motor works intermittently. After the motor drives the valve plate to deflect from the initial position to the second preset direction to the second preset angle, the motor stops working. Under the action of the torsion spring, the valve plate swings back and forth in the second preset direction and the direction opposite to the second preset direction until it finally stops at the initial position, which is one motor working cycle.

[0074] In a possible implementation, the further method includes: upon receiving downhole measurement while drilling data sent by a downhole communication circuit, when it is determined according to a preset program that the downhole measurement while drilling data does not need to be transmitted to the ground, storing the downhole measurement while drilling data in the data processing and storage circuit, and when the downhole measurement while drilling data needs to be sent to the ground, reading the downhole measurement while drilling data from the data processing and storage circuit.

[0075] In a possible implementation, it also includes: receiving downhole real-time monitoring data sent by the downhole communication circuit, and when receiving a ground instruction to send the downhole real-time monitoring data to the ground, generating a control timing according to the motor data provided by the motor drive control circuit, the angle information of the valve plate provided by the downhole communication circuit, and the preset working mode, and sending the control timing to the motor drive control circuit, so that the motor drive control circuit controls the motor to work in the preset working mode.

[0076] In a possible implementation, it also includes: when receiving downhole measurement while drilling data sent by the downhole communication circuit, when it is determined according to a preset program that the downhole measurement while drilling data needs to be transmitted to the ground, if the motor drive control circuit has not yet been started, controlling the power conversion circuit to supply power to the motor drive control circuit; when there is no need to continue transmitting the downhole measurement while drilling data to the ground, controlling the power conversion circuit to stop supplying power to the motor drive control circuit.

[0077] In a possible implementation manner, the motor data includes at least one of the following: position information, coil temperature, rotor speed, and motor fault code.

[0078] In a possible implementation, it also includes: when receiving a switching working mode instruction sent from the ground, generating a control timing according to the motor data provided by the motor drive control circuit, the angle information of the valve plate provided by the downhole communication circuit, and the switched working mode, and sending the control timing to the motor drive control circuit, so that the motor drive control circuit controls the motor to operate in the switched working mode.

[0079] An embodiment of the present invention further provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned mud pressure wave signal modulation method when executing the computer program.

[0080] An embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the above-mentioned mud pressure wave signal modulation method is implemented.

[0081] An embodiment of the present invention further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the above-mentioned mud pressure wave signal modulation method is implemented.

[0082] In an embodiment of the present invention, a mud pressure wave signal modulation device is provided, comprising: a motor, a valve plate, a main control circuit, a motor drive control circuit, and a downhole communication circuit; wherein the valve plate can rotate around an axial direction perpendicular to the flow direction of the drilling fluid under the drive of the motor, and the valve plate can form a cross-section that controls the actual flow channel size of the drilling fluid in the drilling fluid channel through the rotation of the valve plate; the motor and the valve plate are arranged in the drilling fluid channel, and the drilling fluid channel, the motor, the valve plate, the main control circuit, the motor drive control circuit, and the downhole communication circuit are arranged in the drill collar; the main control circuit is used to receive downhole measurement while drilling data sent by the downhole communication circuit, and when it is determined according to a preset program that the downhole measurement while drilling data needs to be transmitted to the ground, a control sequence is generated according to the motor data provided by the motor drive control circuit, the angle information of the valve plate provided by the downhole communication circuit, and the preset working mode, and the control sequence is sent to the motor drive control circuit, so that the motor drive control circuit controls the motor to work in the preset working mode. In this way, the motor is directly connected to the valve plate, which can directly drive the valve plate to rotate. Driven by the motor, the valve plate can rotate around an axis perpendicular to the flow direction of the drilling fluid. It has a fast response and direct action, which increases the torque of the motor to drive the valve plate to rotate, reduces energy consumption, and improves the utilization rate of electric energy.

[0083] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0084] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0085] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0086] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0087] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A mud pressure wave signal modulation device, characterized in that: include: Motor, valve plate, main control circuit, motor drive control circuit, downhole communication circuit; The valve plate can rotate around an axial direction perpendicular to the flow direction of the drilling fluid under the drive of the motor, and the valve plate can form a cross section that controls the actual flow channel size of the drilling fluid in the drilling fluid channel through the rotation of the valve plate; the motor and the valve plate are arranged in the drilling fluid channel, and the drilling fluid channel, the main control circuit, the motor drive control circuit, and the downhole communication circuit are arranged in the drill collar; The main control circuit is used to receive downhole measurement while drilling data sent by the downhole communication circuit, and when it is determined according to a preset program that the downhole measurement while drilling data needs to be transmitted to the surface, generate a control sequence according to the motor data provided by the motor drive control circuit, the valve plate angle information provided by the downhole communication circuit, and the preset working mode, and send the control sequence to the motor drive control circuit, so that the motor drive control circuit controls the motor to work in the preset working mode; The valve plate comprises an arc-shaped valve plate; the cross section formed by the arc-shaped valve plate can block the flow of drilling fluid in the drilling fluid channel when the cross section formed by the arc-shaped valve plate is rotated to be perpendicular to the direction of the drilling fluid, and the actual flow channel of the drilling fluid in the drilling fluid channel is maximized when the cross section formed by the arc-shaped valve plate is rotated to be parallel to the direction of the drilling fluid; The device also includes a motor torque output shaft; the motor torque output shaft is perpendicular to the flow direction of the drilling fluid, and the valve plate is connected to the motor through the motor torque output shaft and can rotate around the motor torque output shaft under the drive of the motor; A torsion spring is also provided on the motor torque output shaft, the first end of the torsion spring is connected to the motor torque output shaft, and the second end of the torsion spring is connected to the valve plate; the preset working mode includes any one of the following modes 1, 2 and 3: Mode 1: the motor rotates continuously, and the valve plate rotates in a circular motion with the motor, and one circle of rotation is one motor working cycle; Mode 2: the motor works intermittently, and the motor drives the valve plate to deflect from the initial position to the first preset direction to the first preset angle, and then the motor stops working, and the valve plate moves in the opposite direction of the first preset direction under the action of the torsion spring. When After the valve plate moves to the initial position, the motor continues to work and drives the valve plate to deflect to the first preset direction opposite to the first preset direction to the first preset angle, then the motor stops working, and the valve plate moves to the first preset direction under the action of the torsion spring, and returns to the initial position, which is one motor working cycle; Mode three: The motor works intermittently, and the motor drives the valve plate to deflect from the initial position to the second preset direction to the second preset angle, then the motor stops working, and the valve plate swings back and forth in the second preset direction and the direction opposite to the second preset direction under the action of the torsion spring until it finally stops at the initial position, which is one motor working cycle; The main control circuit is also used to generate a control timing based on the motor data provided by the motor drive control circuit, the angle information of the valve plate fed back by the downhole communication circuit, and the switched working mode when receiving the switching working mode instruction sent from the ground, and send the control timing to the motor drive control circuit so that the motor drive control circuit controls the motor to operate in the switched working mode.

2. The mud pressure wave signal modulation device according to claim 1, characterized in that: Also includes: Data processing and storage circuits; The main control circuit is also used for, when receiving the downhole measurement while drilling data sent by the downhole communication circuit, storing the downhole measurement while drilling data in the data processing and storage circuit when it is determined according to a preset program that the downhole measurement while drilling data does not need to be transmitted to the ground, and reading the downhole measurement while drilling data from the data processing and storage circuit when it is necessary to send the downhole measurement while drilling data to the ground.

3. The mud pressure wave signal modulation device according to claim 1, characterized in that: The main control circuit is also used to receive downhole real-time monitoring data sent by the downhole communication circuit. When receiving a ground instruction to send the downhole real-time monitoring data to the ground, it generates a control timing based on the motor data provided by the motor drive control circuit, the angle information of the valve plate provided by the downhole communication circuit, and the preset working mode, and sends the control timing to the motor drive control circuit so that the motor drive control circuit controls the motor to work in the preset working mode.

4. The mud pressure wave signal modulation device according to claim 1, characterized in that: Also includes: Power conversion circuit; The first end of the power conversion circuit is connected to the main control circuit, and the second end of the power conversion circuit is connected to the motor drive control circuit; The main control circuit is also used for, when receiving downhole measurement while drilling data sent by the downhole communication circuit, determining according to a preset program that the downhole measurement while drilling data needs to be transmitted to the ground, if the motor drive control circuit has not been started, controlling the power conversion circuit to supply power to the motor drive control circuit; when there is no need to continue transmitting the downhole measurement while drilling data to the ground, controlling the power conversion circuit to stop supplying power to the motor drive control circuit.

5. The mud pressure wave signal modulation device according to claim 1, characterized in that: The motor data includes at least one of the following: position information, coil temperature, rotor speed, and motor fault code.

6. A method for modulating a mud pressure wave signal, characterized in that: The main control circuit used in the mud pressure wave signal modulation device according to any one of claims 1 to 5 comprises: Receiving downhole measurement while drilling data sent by the downhole communication circuit, and when determining according to a preset program that the downhole measurement while drilling data needs to be transmitted to the surface, generating a control sequence according to the motor data provided by the motor drive control circuit, the angle information of the valve plate provided by the downhole communication circuit, and the preset working mode; The control timing is sent to the motor drive control circuit so that the motor drive control circuit controls the motor to work in a preset working mode.

7. The mud pressure wave signal modulation method according to claim 6, characterized in that: The mud pressure wave signal modulation device further includes a motor torque output shaft, and a torsion spring is further provided on the motor torque output shaft, and the first end of the torsion spring is connected to the motor torque output shaft, and the second end of the torsion spring is connected to the valve plate. The preset working mode includes any one of the following modes 1, 2, and 3: Mode 1: The motor rotates continuously, and the valve plate rotates in a complete circle with the motor. One complete circle is one motor working cycle. Mode 2: The motor works intermittently. After the motor drives the valve plate to deflect from the initial position to the first preset direction to the first preset angle, the motor stops working. The valve plate moves in the direction opposite to the first preset direction under the action of the torsion spring. When the valve plate moves to the initial position, the motor continues to work and drives the valve plate to deflect in the direction opposite to the first preset direction to the first preset angle. After that, the motor stops working. The valve plate moves in the first preset direction under the action of the torsion spring. Restoring to the initial position is one motor working cycle. Mode 3: The motor works intermittently. After the motor drives the valve plate to deflect from the initial position to the second preset direction to the second preset angle, the motor stops working. The valve plate swings back and forth in the second preset direction and the direction opposite to the second preset direction under the action of the torsion spring until it finally stops at the initial position, which is one motor working cycle.

8. The mud pressure wave signal modulation method according to claim 6, characterized in that: Also includes: When receiving downhole measurement while drilling data sent by the downhole communication circuit, when it is determined according to a preset program that the downhole measurement while drilling data does not need to be transmitted to the ground, the measurement while drilling data is stored in the data processing and storage circuit, and when the downhole measurement while drilling data needs to be sent to the ground, the downhole measurement while drilling data is read from the data processing and storage circuit.

9. The mud pressure wave signal modulation method according to claim 6, characterized in that: Also includes: Receive the downhole real-time monitoring data sent by the downhole communication circuit. When receiving the ground instruction to send the downhole real-time monitoring data to the ground, generate the control timing according to the motor data provided by the motor drive control circuit, the angle information of the valve plate provided by the downhole communication circuit, and the preset working mode, and send the control timing to the motor drive control circuit so that the motor drive control circuit controls the motor to work in the preset working mode.

10. The mud pressure wave signal modulation method according to claim 6, characterized in that: Also includes: When receiving downhole measurement while drilling data sent by the downhole communication circuit, when it is determined according to a preset program that the downhole measurement while drilling data needs to be transmitted to the ground, if the motor drive control circuit has not yet been started, the power conversion circuit is controlled to supply power to the motor drive control circuit; when there is no need to continue transmitting the downhole measurement while drilling data to the ground, the power conversion circuit is controlled to stop supplying power to the motor drive control circuit.

11. The mud pressure wave signal modulation method according to claim 6, characterized in that: The motor data includes at least one of the following: position information, coil temperature, rotor speed, and motor fault code.

12. The mud pressure wave signal modulation method according to claim 6, characterized in that: Also includes: When the operating mode switching instruction sent from the ground is received, a control timing is generated based on the motor data provided by the motor drive control circuit, the angle information of the valve plate provided by the downhole communication circuit, and the switched operating mode, and the control timing is sent to the motor drive control circuit so that the motor drive control circuit controls the motor to operate in the switched operating mode.

13. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 6 to 12 is implemented.

14. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 6 to 12 is implemented.

15. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the method according to any one of claims 6 to 12 is implemented.

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