Downhole pressure wave signal modulation system and method

Abstract

The invention discloses a modulation system and method for downhole pressure wave signals. The system comprises: a communication interface for receiving modulation control instructions and downhole measurement data, wherein the modulation control instructions indicate that the modulation mode is a QPSK modulation mode or a baseband frequency band modulation mode; a processor for encoding the downhole measurement data and triggering a signal modulation circuit according to the modulation control instructions; acquiring the up-motor rotor angular displacement data and the down-motor rotor angular displacement data from an up-motor rotor angular displacement sensor and a down-motor rotor angular displacement sensor, and then sending the acquired data to a motor main control circuit, so that the motor main control circuit controls the rotation of the up-motor rotor and the down-motor rotor; and a signal modulation circuit for, after being triggered by the processor, modulating the encoded downhole measurement data into an up-motor pressure wave signal and a down-motor pressure wave signal according to the pressure wave signal modulation mode, and then sending the acquired data to the motor main control circuit to drive the up-motor and the down-motor to operate, thereby improving the downhole measurement data transmission rate.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas drilling, and in particular to a modulation system and method for a downhole pressure wave signal. Background Art

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

[0003] In the existing downhole measurement while drilling data transmission system, mud continuous wave transmission equipment is widely used due to its high reliability and fast transmission rate. However, the existing transmission rate and technology cannot meet the higher requirements of downhole measurement while drilling information with multiple types, large data volume and real-time performance.

[0004] Currently, no effective solution has been proposed to the above problems. Summary of the invention

[0005] The embodiment of the present invention provides a modulation system for downhole pressure wave signals, which is used to transmit measurement while drilling data by adopting different pressure wave signal modulation modes through a dual-motor dual-rotor structure, thereby improving the transmission rate of measurement while drilling data and enhancing the flexibility and reliability of measurement while drilling data in the transmission process. The modulation system is applied to a mud continuous wave pulser device, wherein the mud continuous wave pulser device comprises: an upper motor, a lower motor, and a motor main control circuit respectively connected to the upper motor and the lower motor; wherein the upper motor is provided with an upper motor rotor and an upper motor rotor angular displacement sensor connected to the upper motor rotor; the lower motor is provided with a lower motor rotor and a lower motor rotor angular displacement sensor connected to the lower motor rotor; the modulation system for downhole pressure wave signals comprises:

[0006] A communication interface, used for receiving modulation control instructions and measurement while drilling data, wherein the modulation control instructions indicate that the pressure wave signal modulation mode is a QPSK modulation mode or a baseband frequency band modulation mode;

[0007] The processor is used to encode the measurement while drilling data and trigger the signal modulation circuit according to the modulation control instruction; obtain the upper motor rotor angular displacement data from the upper motor rotor angular displacement sensor and obtain the lower motor rotor angular displacement data from the lower motor rotor angular displacement sensor; send the upper motor rotor angular displacement data and the lower motor rotor angular displacement data to the motor main control circuit, so that the motor main control circuit controls the upper motor rotor to rotate according to the upper motor rotor angular displacement data and controls the lower motor rotor to rotate according to the lower motor rotor angular displacement data;

[0008] The signal modulation circuit is used for modulating the encoded measurement while drilling data into an upper motor pressure wave signal and a lower motor pressure wave signal according to the pressure wave signal modulation mode after being triggered by the processor; sending the upper motor pressure wave signal and the lower motor pressure wave signal to the motor main control circuit, so that the motor main control circuit drives the upper motor to operate according to the upper motor pressure wave signal, and drives the lower motor to operate according to the lower motor pressure wave signal.

[0009] The embodiment of the present invention further provides a modulation method of a downhole pressure wave signal, which is applied to a mud continuous wave pulser device, wherein the mud continuous wave pulser device comprises: an upper motor, a lower motor, and a motor main control circuit respectively connected to the upper motor and the lower motor; wherein the upper motor is provided with an upper motor rotor and an upper motor rotor angular displacement sensor connected to the upper motor rotor; the lower motor is provided with a lower motor rotor and a lower motor rotor angular displacement sensor connected to the lower motor rotor; the modulation method of the downhole pressure wave signal comprises:

[0010] receiving a modulation control instruction and measurement while drilling data, wherein the modulation control instruction indicates that the pressure wave signal modulation mode is a QPSK modulation mode or a baseband frequency band modulation mode;

[0011] Encode the measurement while drilling data, and trigger the signal modulation circuit according to the modulation control instruction; obtain the upper motor rotor angular displacement data from the upper motor rotor angular displacement sensor, and obtain the lower motor rotor angular displacement data from the lower motor rotor angular displacement sensor; send the upper motor rotor angular displacement data and the lower motor rotor angular displacement data to the motor main control circuit, so that the motor main control circuit controls the upper motor rotor to rotate according to the upper motor rotor angular displacement data, and controls the lower motor rotor to rotate according to the lower motor rotor angular displacement data;

[0012] The encoded measurement while drilling data is modulated into an upper motor pressure wave signal and a lower motor pressure wave signal according to the pressure wave signal modulation mode; the upper motor pressure wave signal and the lower motor pressure wave signal are sent to a motor main control circuit, so that the motor main control circuit drives the upper motor to operate according to the upper motor pressure wave signal, and drives the lower motor to operate according to the lower motor pressure wave signal.

[0013] 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 modulation method of the downhole pressure wave signal is implemented.

[0014] 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 modulation method of the downhole pressure wave signal is implemented.

[0015] The modulation system of the downhole pressure wave signal in the embodiment of the present invention adopts a dual-motor dual-rotor structure and adopts different pressure wave signal modulation modes to transmit the measurement while drilling data, including: a communication interface for receiving a modulation control instruction and the measurement while drilling data, wherein the modulation control instruction indicates that the pressure wave signal modulation mode is a QPSK modulation mode or a baseband frequency band modulation mode; a processor for encoding the measurement while drilling data and triggering a signal modulation circuit according to the modulation control instruction; obtaining the upper motor rotor angular displacement data from the upper motor rotor angular displacement sensor and obtaining the lower motor rotor angular displacement data from the lower motor rotor angular displacement sensor; sending the upper motor rotor angular displacement data and the lower motor rotor angular displacement data to the electric control circuit; The invention discloses a motor main control circuit, so that the motor main control circuit controls the rotation of the upper motor rotor according to the upper motor rotor angular displacement data, and controls the rotation of the lower motor rotor according to the lower motor rotor angular displacement data; the signal modulation circuit is used for modulating the encoded while drilling measurement data into the upper motor pressure wave signal and the lower motor pressure wave signal according to the pressure wave signal modulation mode after being triggered by the processor; the upper motor pressure wave signal and the lower motor pressure wave signal are sent to the motor main control circuit, so that the motor main control circuit drives the upper motor to run according to the upper motor pressure wave signal, and drives the lower motor to run according to the lower motor pressure wave signal, so as to improve the transmission rate of the while drilling measurement data and enhance the flexibility and reliability of the while drilling measurement data in the transmission process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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:

[0017] Figure 1 A mud continuous wave pulser device in an embodiment of the present invention;

[0018] Figure 2 It is a structural schematic diagram of a modulation system of a downhole pressure wave signal in an embodiment of the present invention;

[0019] Figure 3A , Figure 3B , Figure 3C It is a schematic diagram of the structure of the rotary valve upper rotor, the rotary valve lower rotor, and the rotary valve stator in an embodiment of the present invention;

[0020] Figure 4 It is a schematic diagram of a specific example in which a signal modulation circuit in an embodiment of the present invention adopts a QPSK modulation mode to generate a pressure wave signal;

[0021] Figure 5This is a waveform diagram of a pressure wave signal generated by a signal modulation circuit using a QPSK modulation mode in an embodiment of the present invention;

[0022] Figure 6 It is a schematic diagram of a specific example in which the signal modulation circuit in the embodiment of the present invention adopts the baseband frequency band modulation mode to generate a pressure wave signal;

[0023] Figure 7 This is a waveform diagram of a pressure wave signal generated by a signal modulation circuit in an embodiment of the present invention using a baseband frequency modulation mode;

[0024] Figure 8 It is a schematic diagram of a working principle of a modulation system of a downhole pressure wave signal in an embodiment of the present invention;

[0025] Fig. 9 is a processing flow chart of a modulation method of a downhole pressure wave signal in an embodiment of the present invention;

[0026] Fig.10 The figure is a schematic diagram of the structure of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] 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.

[0028] Oil and gas drilling requires measuring downhole information and transmitting the measured information to the ground in order to monitor the downhole drilling tools, wellbore and formation conditions. Usually, drilling operations require connecting hundreds of drill pipes less than 10 meters in length, and connecting drill collars, measuring tools, power drills and drill bits at the bottom. By applying appropriate drilling pressure and rotating the drill string or circulating mud to drive the bottom hole power drill to rotate and drive the drill bit to break the rock. During the drilling process, mud is pumped into the drill string water hole through a mud pump, and the mud flows out of the drill bit and returns to the ground along the annular space between the drill string and the well wall to establish a mud circulation. The role of circulating mud is: on the one hand, it brings the broken rock debris out of the ground, and on the other hand, it protects the well wall, balances the formation pressure and cools and lubricates the drill bit. Through continuous drilling, the oil and gas reservoirs buried at a depth of thousands or even tens of thousands of meters are opened, and then the oil and gas can be extracted. Since downhole drilling tools are subject to various forces such as tension, compression, bending, torsion and vibration, as well as high temperature, high pressure environment and abnormal formation pressure conditions, these parameters must be monitored to ensure safe operation and efficient drilling. At the same time, it is also necessary to understand the geological information of the formation in a timely manner so that engineers can make engineering and geological decisions and take appropriate measures to efficiently open the reservoir and create conditions for subsequent efficient mining. There are many means to transmit downhole information to the ground, such as cables, smart drill pipes, sound waves, electromagnetic waves, mud pressure waves, etc. Cables transmit information quickly and with high quality, but as mentioned earlier, since hundreds of drill pipes need to be connected, a single cable is used for transmission. When connecting a single pipe, it is necessary to continuously pull up and down the cable, which is very inconvenient and inefficient. With the development of wireless transmission technology, cable transmission has been basically eliminated in conventional drilling operations except for continuous pipe operations and cable logging operations. Smart drill pipes use special drill pipes, lay cables in the drill pipes, and establish communication links at the joints through coil coupling or contact connection, which can achieve higher transmission rates, but special drill pipes are required, which are costly and are not widely used at present. Electromagnetic wave transmission is limited by transmission attenuation in the formation, and the transmission depth is greatly restricted. Therefore, relying on mud pressure waves to transmit downhole information is still the mainstream, but the transmission rate of conventional positive pulse baseband signals is low, usually not higher than 3bps, and the continuous wave transmission rate is relatively high, but usually only 5-20bps, which cannot meet the current downhole measurement while drilling information with a variety of types, large data volume and higher real-time requirements.

[0029] The inventors found that although the transmission of downhole information by mud pressure wave has been widely used, the existing mud continuous wave pulser device cannot meet the requirements of downhole measurement while drilling with a variety of information, large data volume and real-time information. Therefore, the present invention provides a modulation system for downhole pressure wave signals to solve the problems of slow downhole information transmission rate and limited transmission process of mud pressure wave.

[0030] Figure 1The invention is a mud continuous wave pulser device in an embodiment of the present invention, wherein the mud continuous wave pulser device comprises: an upper motor 101, a lower motor 102, and a motor main control circuit 103 respectively connected to the upper motor 101 and the lower motor 102; wherein the upper motor 101 is provided with an upper motor rotor 104 and an upper motor rotor angular displacement sensor 105 connected to the upper motor rotor 104; and the lower motor 102 is provided with a lower motor rotor 106 and a lower motor rotor angular displacement sensor 107 connected to the lower motor rotor 106.

[0031] In one embodiment, the mud continuous wave pulser device may further include: a rotary valve upper rotor, a rotary valve lower rotor, and a rotary valve stator, wherein the rotary valve upper rotor is rigidly connected to the upper motor rotor, and the upper motor rotor drives the rotary valve upper rotor to rotate; the rotary valve lower rotor is rigidly connected to the lower motor rotor, and the lower motor rotor drives the rotary valve lower rotor to rotate; the rotary valve stator is located between the rotary valve upper rotor and the rotary valve lower rotor, and is used to cooperate with the rotation of the rotary valve upper rotor and the rotary valve lower rotor to generate pressure waves.

[0032] like Figure 1 As shown, the mud continuous wave pulser device may further include: a rotary valve upper rotor 108 , a rotary valve lower rotor 109 , and a rotary valve stator 110 . Figure 3A It is a schematic structural diagram of the rotor on the rotary valve in an embodiment of the present invention; Figure 3B It is a structural schematic diagram of the lower rotor of the rotary valve in an embodiment of the present invention; Figure 3C The structure diagram of the rotary valve stator in the embodiment of the present invention is shown in FIG. A gap of about 1 to 5 mm can be left between the rotary valve upper rotor 108, the rotary valve lower rotor 109, and the rotary valve stator 110, and the same grooves are left, but the shape of the grooves is not limited to Figure 3A , Figure 3B , Figure 3C shown.

[0033] The range of motion of the upper rotor 108 of the rotary valve is the upper half of the rotary valve stator 110, and the range of motion of the lower rotor 109 of the rotary valve is the lower half of the rotary valve stator 110. Therefore, when the upper rotor 108 and the lower rotor 109 of the rotary valve are working, they will not interfere with each other's movement and the waveform generated. In specific implementation, during the movement of the upper rotor 108 and the lower rotor 109 of the rotary valve, the overlapping area of ​​the slots with the rotary valve stator 110 changes continuously, causing the pressure of the drilling fluid to change. The pressure change generated is a pressure wave, which is used to transmit downhole measurement while drilling data.

[0034] Figure 2 FIG. 1 is a schematic diagram of the structure of a modulation system for a downhole pressure wave signal in an embodiment of the present invention. Figure 1 The mud continuous wave pulser device shown in FIG. Figure 2 As shown, the modulation system of the downhole pressure wave signal in the embodiment of the present invention may include:

[0035] The communication interface 201 is used to receive modulation control instructions and measurement while drilling data, wherein the modulation control instructions indicate that the pressure wave signal modulation mode is a QPSK modulation mode or a baseband frequency band modulation mode;

[0036] The processor 202 is used to encode the measurement while drilling data, trigger the signal modulation circuit according to the modulation control instruction; obtain the upper motor rotor angular displacement data from the upper motor rotor angular displacement sensor, and obtain the lower motor rotor angular displacement data from the lower motor rotor angular displacement sensor; send the upper motor rotor angular displacement data and the lower motor rotor angular displacement data to the motor main control circuit, so that the motor main control circuit controls the upper motor rotor to rotate according to the upper motor rotor angular displacement data, and controls the lower motor rotor to rotate according to the lower motor rotor angular displacement data;

[0037] The signal modulation circuit 203 is used to modulate the encoded measurement while drilling data into an upper motor pressure wave signal and a lower motor pressure wave signal according to the pressure wave signal modulation mode after being triggered by the processor; and send the upper motor pressure wave signal and the lower motor pressure wave signal to the motor main control circuit, so that the motor main control circuit drives the upper motor to operate according to the upper motor pressure wave signal, and drives the lower motor to operate according to the lower motor pressure wave signal.

[0038] In specific implementation, the communication interface can first receive modulation control instructions and downhole measurement data, wherein the modulation control instructions indicate that the pressure wave signal modulation mode is QPSK modulation mode or baseband frequency band modulation mode, and then the processor can encode the downhole measurement data and trigger the signal modulation circuit according to the modulation control instructions.

[0039] In one embodiment, the processor is also used to, before triggering the signal modulation circuit according to the modulation control instruction: when the pressure wave signal modulation mode is the QPSK modulation mode, process the encoded measurement while drilling data according to a predetermined rule into: measurement while drilling data for generating the upper motor pressure wave signal, and measurement while drilling data for generating the lower motor pressure wave signal, and provide them to the signal modulation circuit; when the pressure wave signal modulation mode is the baseband frequency band modulation mode, process the encoded measurement while drilling data according to the change rate of the measurement while drilling data into: measurement while drilling data for generating the upper motor pressure wave signal, and measurement while drilling data for generating the lower motor pressure wave signal, and provide them to the signal modulation circuit.

[0040] Quadrature Phase Shift Keying (QPSK) is a digital modulation method. QPSK specifies four carrier phases, namely 45°, 135°, 225°, and 315°. The data input to the signal modulation circuit is a binary digital sequence. In order to match the quaternary carrier phase, the binary data needs to be converted into quaternary data, which means that every two bits in the binary digital sequence need to be divided into a group. There are four combinations, namely 00, 01, 10, and 11, each of which is called a dibit symbol. Each dibit symbol is composed of two binary information bits, which represent one of the four symbols in the quaternary system. In QPSK, each modulation can transmit 2 information bits, which are transmitted through the four phases of the carrier, and the phase of the carrier is realized through the different outputs of the two swing valve rotors.

[0041] The demodulator determines the information bits sent by the transmitter based on the phase of the received carrier signal; the carrier amplitude and phase can be recorded as a point in two-dimensional space, and the vector represented by this point has I value and Q value projected on the horizontal and vertical axes respectively. I is the in-phase component, representing the projection of the vector on the horizontal axis; Q is the 90-degree phase shift (Quadrate) component, representing the projection of the vector on the vertical axis. In this way, the modulated data is divided into two paths, the in-phase (I) and quadrature (Q) components. These two components are orthogonal, with a phase difference of 90 degrees and are independent of each other. After modulation, the IQ paths are processed separately, and intermediate frequency and radio frequency processing are performed, and finally merged into one path before the decoder.

[0042] The baseband frequency modulation mode is used to transmit measurement while drilling data with different change rates, and the working modes of high and low frequency carriers can be realized. The baseband frequency is low, and the measurement while drilling data that does not change much over time can be transmitted, such as engineering parameters: drilling pressure, torque, temperature, vibration, annular water pressure, etc.; the frequency band frequency is high, and the measurement while drilling data that changes greatly over time can be transmitted, such as geological parameters: formation resistivity, gamma, etc. High and low frequencies are modulated, and the low frequency has a long transmission distance and strong anti-interference ability. Even if the high-frequency transmission is subject to greater interference and influence, the important engineering parameters can still be transmitted to the ground through the low-frequency channel after decoding and filtering, so as not to affect the conventional drilling work.

[0043] According to the above content, it can be known that the "carriers" of the measurement while drilling data transmitted by the QPSK modulation mode and the baseband frequency band modulation mode are different. The QPSK modulation mode transmits the measurement while drilling data through the phase of the signal, while the baseband frequency band modulation mode transmits the measurement while drilling data through the amplitude. The measurement while drilling data can be divided into high-frequency data that varies greatly over time, and low-frequency data that does not vary much over time. The QPSK modulation mode and the baseband frequency band modulation mode can be distinguished by decoding by the ground receiving device.

[0044] In specific implementation, after the processor triggers the signal modulation circuit according to the modulation control instruction, the signal modulation circuit can modulate the encoded downhole measurement data into an upper motor pressure wave signal and a lower motor pressure wave signal according to the pressure wave signal modulation mode; and send the upper motor pressure wave signal and the lower motor pressure wave signal to the motor main control circuit, so that the motor main control circuit drives the upper motor to operate according to the upper motor pressure wave signal, and drives the lower motor to operate according to the lower motor pressure wave signal.

[0045] In one embodiment, the signal modulation circuit can be specifically used to: when the pressure wave signal modulation mode is the QPSK modulation mode, modulate the encoded measurement while drilling data into an upper motor pressure wave signal and a lower motor pressure wave signal according to the following formula:

[0046]

[0047]

[0048] Among them, φ1(t) is the modulation signal of the upper motor pressure wave at different times, φ2(t) is the modulation signal of the lower motor pressure wave at different times, T S is the quaternary symbol interval, w c is the angular frequency of the modulation signal, and t is the time.

[0049] Figure 4 This is a schematic diagram of a specific example of a signal modulation circuit in an embodiment of the present invention using a QPSK modulation mode to generate a pressure wave signal. Figure 4 As shown, the signal modulation circuit first receives the measurement while drilling data processed according to a predetermined rule, for example: 1001 and 1010, and then can use the QPSK modulation mode to modulate 1001 and 1010. The signal modulation circuit modulates 1001 into an upper motor pressure wave signal and modulates 1010 into a lower motor pressure wave signal according to the different modulation signals of the upper and lower motors (i.e., φ1(t) and φ2(t) in the figure, also called basis functions, which must be orthogonal) and the QPSK algorithm theory. Finally, the upper motor pressure wave signal and the lower motor pressure wave signal are sent to the motor main control circuit, so that the motor main control circuit drives the upper motor to run according to the upper motor pressure wave signal and drives the lower motor to run according to the lower motor pressure wave signal.

[0050] Figure 5 FIG. 1 is a waveform diagram of a pressure wave signal generated by a signal modulation circuit using a QPSK modulation mode in an embodiment of the present invention. Figure 5 As shown, waveform I is the pressure wave signal corresponding to the encoded while drilling measurement data 1001, waveform Q is the pressure wave signal corresponding to the encoded while drilling measurement data 1010, and waveform QPSK is the QPSK pressure wave signal after waveform I and waveform Q are merged before the decoder.

[0051] In one embodiment, the signal modulation circuit can be specifically used to: when the pressure wave signal modulation mode is the baseband frequency band modulation mode, modulate the encoded measurement while drilling data into the upper motor pressure wave signal and the lower motor pressure wave signal according to the following formula:

[0052]

[0053]

[0054] Among them, f1(t) is the pressure wave signal of the upper motor at different times, f2(t) is the pressure wave signal of the lower motor at different times, A1, A2, B1, B2 are constants greater than or equal to zero, w2 is the angular frequency of f2(t), is the phase of the continuous wave signal, n is a natural number, T is the period of the low-frequency signal, and t is time.

[0055] Figure 6 This is a schematic diagram of a specific example of a signal modulation circuit in an embodiment of the present invention using a baseband frequency modulation mode to generate a pressure wave signal. Figure 6 As shown, the signal modulation circuit first receives the measurement while drilling data processed according to the change rate, including: the measurement while drilling data with a fast change rate and the measurement while drilling data with a slow change rate, and then the baseband frequency band modulation mode can be used to modulate the measurement while drilling data with a fast change rate and the measurement while drilling data with a slow change rate. The signal modulation circuit modulates the measurement while drilling data with a fast change rate into the upper motor pressure wave signal, that is, the frequency band signal, according to the different modulation signals of the upper and lower motors (i.e., f1(t) and f2(t) in the figure) and according to the baseband frequency band algorithm theory; modulates the measurement while drilling data with a slow change rate into the lower motor pressure wave signal, that is, the baseband signal; and finally sends the frequency band signal and the baseband signal to the motor main control circuit, so that the motor main control circuit drives the upper motor to run according to the frequency band signal and drives the lower motor to run according to the baseband signal.

[0056] Figure 7 This is a waveform diagram of a pressure wave signal generated by a signal modulation circuit in an embodiment of the present invention using a baseband frequency modulation mode. Figure 7 The waveform shown is based on Figure 6The waveform obtained by combining the upper motor pressure wave signal and the motor pressure wave signal is used as the waveform diagram corresponding to the baseband frequency band pressure wave signal.

[0057] In one embodiment, the modulation system of the downhole pressure wave signal further includes: an uninterrupted clock for providing a clock signal to the processor; the processor is further configured to: monitor the operating status of the modulation system of the downhole pressure wave signal according to the clock signal.

[0058] Figure 8 FIG. 1 is a schematic diagram of a working principle of a modulation system for a downhole pressure wave signal in an embodiment of the present invention. Figure 8 As shown, it involves a communication interface 801, a processor 802, a memory 803, a signal modulation circuit 804, a motor main control circuit 805, an upper motor 806, a lower motor 807, an upper motor rotor angular displacement sensor 808, a lower motor rotor angular displacement sensor 809, and an uninterruptible clock 810.

[0059] In a specific implementation, the communication interface 801 may first receive a modulation control instruction and measurement while drilling data, wherein the modulation control instruction indicates that the pressure wave signal modulation mode is a QPSK modulation mode or a baseband frequency band modulation mode; then the processor 802 encodes the measurement while drilling data, saves the encoded measurement while drilling data into a memory 803, and triggers a signal modulation circuit 804 according to the modulation control instruction; after being triggered by the processor 803, the signal modulation circuit 804 modulates the encoded measurement while drilling data into an upper motor pressure wave signal and a lower motor pressure wave signal according to the pressure wave signal modulation mode, and sends the upper motor pressure wave signal and the lower motor pressure wave signal to the motor main control circuit 805, so that the motor main control circuit 805 drives the upper motor 806 to run according to the upper motor pressure wave signal, and drives the lower motor 807 to run according to the lower motor pressure wave signal; after the upper motor 806 and the lower motor 807 are running, the processor 802 can obtain the upper motor rotor angular displacement data from the upper motor rotor angular displacement sensor 808, and obtain the lower motor rotor angular displacement data from the lower motor rotor angular displacement sensor 809; the upper motor rotor angular displacement data and the lower motor rotor angular displacement data are sent to the motor main control circuit 805, so that the motor main control circuit 805 controls the upper motor rotor to rotate according to the upper motor rotor angular displacement data, and controls the lower motor rotor to rotate according to the lower motor rotor angular displacement data.

[0060] The present invention also provides a method for modulating a downhole pressure wave signal, as described in the following embodiments. Since the principle of solving the problem by this method is similar to that of the modulation system of the downhole pressure wave signal, the implementation of this method can refer to the implementation of the modulation system of the downhole pressure wave signal, and the repeated parts will not be repeated.

[0061] Fig. 9FIG. 1 is a processing flow chart of a modulation method for a downhole pressure wave signal in an embodiment of the present invention. A modulation system for a downhole pressure wave signal is applied; Fig. 9 As shown, the modulation method of the downhole pressure wave signal in the embodiment of the present invention may include:

[0062] Step 901: The communication interface receives a modulation control instruction and measurement while drilling data, wherein the modulation control instruction indicates that the pressure wave signal modulation mode is a QPSK modulation mode or a baseband frequency band modulation mode;

[0063] Step 902: The processor encodes the measurement while drilling data, and triggers the signal modulation circuit according to the modulation control instruction; obtains the upper motor rotor angular displacement data from the upper motor rotor angular displacement sensor, and obtains the lower motor rotor angular displacement data from the lower motor rotor angular displacement sensor; sends the upper motor rotor angular displacement data and the lower motor rotor angular displacement data to the motor main control circuit, so that the motor main control circuit controls the upper motor rotor to rotate according to the upper motor rotor angular displacement data, and controls the lower motor rotor to rotate according to the lower motor rotor angular displacement data;

[0064] Step 903, the signal modulation circuit modulates the encoded measurement while drilling data into an upper motor pressure wave signal and a lower motor pressure wave signal according to the pressure wave signal modulation mode; and sends the upper motor pressure wave signal and the lower motor pressure wave signal to the motor main control circuit, so that the motor main control circuit drives the upper motor to operate according to the upper motor pressure wave signal, and drives the lower motor to operate according to the lower motor pressure wave signal.

[0065] In one embodiment, before triggering the signal modulation circuit according to the modulation control instruction, the method further includes:

[0066] When the pressure wave signal modulation mode is the QPSK modulation mode, the signal modulation circuit processes the encoded while drilling measurement data according to a predetermined rule into: while drilling measurement data for generating the upper motor pressure wave signal and while drilling measurement data for generating the lower motor pressure wave signal, and provides them to the signal modulation circuit;

[0067] When the pressure wave signal modulation mode is the baseband frequency band modulation mode, the signal modulation circuit processes the encoded while drilling measurement data according to the change rate of the while drilling measurement data into: while drilling measurement data for generating the upper motor pressure wave signal and while drilling measurement data for generating the lower motor pressure wave signal, and provides them to the signal modulation circuit.

[0068] In one embodiment, the signal modulation circuit modulates the encoded measurement while drilling data into an upper motor pressure wave signal and a lower motor pressure wave signal according to the pressure wave signal modulation mode, including: when the pressure wave signal modulation mode is the QPSK modulation mode, the signal modulation circuit modulates the encoded measurement while drilling data into an upper motor pressure wave signal and a lower motor pressure wave signal according to the following formula:

[0069]

[0070]

[0071] Among them, φ1(t) is the modulation signal of the upper motor pressure wave at different times, φ2(t) is the modulation signal of the lower motor pressure wave at different times, T S is the quaternary symbol interval, w c is the angular frequency of the modulation signal, and t is the time.

[0072] In one embodiment, the signal modulation circuit modulates the encoded measurement while drilling data into an upper motor pressure wave signal and a lower motor pressure wave signal according to the pressure wave signal modulation mode, including: when the modulation control instruction indicates that the pressure wave signal modulation mode is a baseband frequency band modulation mode, the signal modulation circuit modulates the encoded measurement while drilling data into an upper motor pressure wave signal and a lower motor pressure wave signal according to the following formula:

[0073]

[0074]

[0075] Among them, f1(t) is the pressure wave signal of the upper motor at different times, f2(t) is the pressure wave signal of the lower motor at different times, A1, A2, B1, B2 are constants greater than or equal to zero, w2 is the angular frequency of f2(t), is the phase of the continuous wave signal, n is a natural number, T is the period of the low-frequency signal, and t is time.

[0076] In one embodiment, the modulation method of the downhole pressure wave signal may further include:

[0077] The uninterruptible clock provides the clock signal to the processor;

[0078] The processor monitors the operating status of the modulation method of the downhole pressure wave signal according to the clock signal.

[0079] Based on the above invention concept, Fig.10 As shown, the present invention also proposes a computer device 1000, including a memory 1010, a processor 1020, and a computer program 1030 stored in the memory 1010 and executable on the processor 1020, wherein the processor 1020 implements the aforementioned method for processing erroneous transactions when executing the computer program 1030.

[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 modulation method of the downhole pressure wave signal 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 modulation method of the downhole pressure wave signal is implemented.

[0082] In summary, the modulation system of the downhole pressure wave signal in the embodiment of the present invention adopts a dual-motor dual-rotor structure to transmit the measurement while drilling data using different pressure wave signal modulation modes, including: a communication interface for receiving modulation control instructions and measurement while drilling data, wherein the modulation control instructions indicate that the pressure wave signal modulation mode is a QPSK modulation mode or a baseband frequency band modulation mode; a processor for encoding the measurement while drilling data and triggering a signal modulation circuit according to the modulation control instructions; obtaining the upper motor rotor angular displacement data from the upper motor rotor angular displacement sensor, and obtaining the lower motor rotor angular displacement data from the lower motor rotor angular displacement sensor; and transmitting the upper motor rotor angular displacement data and the lower motor rotor angular displacement data to the processor. The signal modulation circuit is used to modulate the encoded measurement while drilling data into an upper motor pressure wave signal and a lower motor pressure wave signal according to the pressure wave signal modulation mode after being triggered by the processor; the upper motor pressure wave signal and the lower motor pressure wave signal are sent to the motor main control circuit, so that the motor main control circuit drives the upper motor to run according to the upper motor pressure wave signal, and drives the lower motor to run according to the lower motor pressure wave signal, which can improve the transmission rate of the measurement while drilling data and enhance the flexibility and reliability of the measurement while drilling data in the transmission process.

[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 A step that specifies a function 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 modulation system for downhole pressure wave signals, characterized in that: The invention is applied to a mud continuous wave pulser device, which comprises: an upper motor, a lower motor, and a motor main control circuit respectively connected to the upper motor and the lower motor; wherein the upper motor is provided with an upper motor rotor and an upper motor rotor angular displacement sensor connected to the upper motor rotor; the lower motor is provided with a lower motor rotor and a lower motor rotor angular displacement sensor connected to the lower motor rotor; the modulation system of the downhole pressure wave signal comprises: A communication interface, used for receiving modulation control instructions and measurement while drilling data, wherein the modulation control instructions indicate that the pressure wave signal modulation mode is a QPSK modulation mode or a baseband frequency band modulation mode; The processor is used to encode the measurement while drilling data and trigger the signal modulation circuit according to the modulation control instruction; obtain the upper motor rotor angular displacement data from the upper motor rotor angular displacement sensor and obtain the lower motor rotor angular displacement data from the lower motor rotor angular displacement sensor; send the upper motor rotor angular displacement data and the lower motor rotor angular displacement data to the motor main control circuit, so that the motor main control circuit controls the upper motor rotor to rotate according to the upper motor rotor angular displacement data and controls the lower motor rotor to rotate according to the lower motor rotor angular displacement data; The signal modulation circuit is used for modulating the encoded measurement while drilling data into an upper motor pressure wave signal and a lower motor pressure wave signal according to the pressure wave signal modulation mode after being triggered by the processor; sending the upper motor pressure wave signal and the lower motor pressure wave signal to the motor main control circuit, so that the motor main control circuit drives the upper motor to operate according to the upper motor pressure wave signal, and drives the lower motor to operate according to the lower motor pressure wave signal; The mud continuous wave pulser device also includes: a rotary valve upper rotor, a rotary valve lower rotor, and a rotary valve stator, wherein the rotary valve upper rotor is rigidly connected to the upper motor rotor, and the upper motor rotor drives the rotary valve upper rotor to rotate; the rotary valve lower rotor is rigidly connected to the lower motor rotor, and the lower motor rotor drives the rotary valve lower rotor to rotate; the rotary valve stator is located between the rotary valve upper rotor and the rotary valve lower rotor, and is used to cooperate with the rotation of the rotary valve upper rotor and the rotary valve lower rotor to generate pressure waves; The signal modulation circuit is specifically used for: when the pressure wave signal modulation mode is the QPSK modulation mode, modulating the encoded measurement while drilling data into the upper motor pressure wave signal and the lower motor pressure wave signal according to the following formula: Among them, φ1(t) is the modulation signal of the upper motor pressure wave at different times, φ2(t) is the modulation signal of the lower motor pressure wave at different times, T S is the quaternary symbol interval, w c is the angular frequency of the modulation signal, t is the time; The signal modulation circuit is specifically used for: when the pressure wave signal modulation mode is the baseband frequency modulation mode, modulating the encoded measurement while drilling data into the upper motor pressure wave signal and the lower motor pressure wave signal according to the following formula: Among them, f1(t) is the pressure wave signal of the upper motor at different times, f2(t) is the pressure wave signal of the lower motor at different times, A1, A2, B1, B2 are constants greater than or equal to zero, w2 is the angular frequency of f2(t), is the phase of the continuous wave signal, n is a natural number, T is the period of the low-frequency signal, and t is time.

2. The modulation system of downhole pressure wave signal according to claim 1, characterized in that: The processor is further configured to: before triggering the signal modulation circuit according to the modulation control instruction: When the pressure wave signal modulation mode is the QPSK modulation mode, the encoded measurement while drilling data is processed according to a predetermined rule into: measurement while drilling data for generating the upper motor pressure wave signal, and measurement while drilling data for generating the lower motor pressure wave signal, and provided to the signal modulation circuit; When the pressure wave signal modulation mode is the baseband frequency modulation mode, the encoded measurement while drilling data is processed into measurement while drilling data for generating the upper motor pressure wave signal and measurement while drilling data for generating the lower motor pressure wave signal according to the change rate of the measurement while drilling data, and provided to the signal modulation circuit.

3. The modulation system of downhole pressure wave signal according to claim 1, characterized in that: The modulation system of the downhole pressure wave signal also includes: An uninterruptible clock for providing a clock signal to the processor; The processor is also used to monitor the operating status of the modulation system of the downhole pressure wave signal according to the clock signal.

4. A method for modulating a downhole pressure wave signal, characterized in that: A modulation system for a downhole pressure wave signal according to any one of claims 1 to 3, the method comprising: The communication interface receives a modulation control instruction and measurement while drilling data, wherein the modulation control instruction indicates that the pressure wave signal modulation mode is a QPSK modulation mode or a baseband frequency band modulation mode; The processor encodes the measurement while drilling data and triggers the signal modulation circuit according to the modulation control instruction; obtains the upper motor rotor angular displacement data from the upper motor rotor angular displacement sensor and obtains the lower motor rotor angular displacement data from the lower motor rotor angular displacement sensor; sends the upper motor rotor angular displacement data and the lower motor rotor angular displacement data to the motor main control circuit, so that the motor main control circuit controls the upper motor rotor to rotate according to the upper motor rotor angular displacement data and controls the lower motor rotor to rotate according to the lower motor rotor angular displacement data; The signal modulation circuit modulates the encoded measurement while drilling data into an upper motor pressure wave signal and a lower motor pressure wave signal according to the pressure wave signal modulation mode; sends the upper motor pressure wave signal and the lower motor pressure wave signal to the motor main control circuit, so that the motor main control circuit drives the upper motor to operate according to the upper motor pressure wave signal, and drives the lower motor to operate according to the lower motor pressure wave signal; the signal modulation circuit modulates the encoded measurement while drilling data into an upper motor pressure wave signal and a lower motor pressure wave signal according to the pressure wave signal modulation mode, including: when the pressure wave signal modulation mode is the QPSK modulation mode, the signal modulation circuit modulates the encoded measurement while drilling data into an upper motor pressure wave signal and a lower motor pressure wave signal according to the following formula: Among them, φ1(t) is the modulation signal of the upper motor pressure wave at different times, φ2(t) is the modulation signal of the lower motor pressure wave at different times, T S is the quaternary symbol interval, w c is the angular frequency of the modulation signal, t is the time; The signal modulation circuit modulates the encoded measurement while drilling data into an upper motor pressure wave signal and a lower motor pressure wave signal according to the pressure wave signal modulation mode, including: when the modulation control instruction indicates that the pressure wave signal modulation mode is a baseband frequency band modulation mode, the signal modulation circuit modulates the encoded measurement while drilling data into an upper motor pressure wave signal and a lower motor pressure wave signal according to the following formula: Among them, f1(t) is the pressure wave signal of the upper motor at different times, f2(t) is the pressure wave signal of the lower motor at different times, A1, A2, B1, B2 are constants greater than or equal to zero, w2 is the angular frequency of f2(t), is the phase of the continuous wave signal, n is a natural number, T is the period of the low-frequency signal, and t is time.

5. The method for modulating a downhole pressure wave signal according to claim 4, characterized in that: Also includes: Before the processor triggers the signal modulation circuit according to the modulation control instruction: When the pressure wave signal modulation mode is the QPSK modulation mode, the encoded measurement while drilling data is processed according to a predetermined rule into: measurement while drilling data for generating the upper motor pressure wave signal, and measurement while drilling data for generating the lower motor pressure wave signal, and provided to the signal modulation circuit; When the pressure wave signal modulation mode is the baseband frequency modulation mode, the encoded measurement while drilling data is processed into measurement while drilling data for generating the upper motor pressure wave signal and measurement while drilling data for generating the lower motor pressure wave signal according to the change rate of the measurement while drilling data, and provided to the signal modulation circuit.

6. The method for modulating a downhole pressure wave signal according to claim 4, characterized in that: Also includes: The uninterruptible clock provides the clock signal to the processor; The processor monitors the operating status of the modulation method of the downhole pressure wave signal according to the clock signal.

7. 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 4 to 5 is implemented.

8. 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 4 to 5 is implemented.

9. 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 4 to 5 is implemented.

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