Underground wireless two-way communication circuit

Abstract

The embodiment of the invention discloses an underground wireless two-way communication circuit. The underground wireless two-way communication circuit is compatible with transmitting and receiving functions of communication signals. Comprising an MCU main control unit, a transmitting / receiving switching unit, a power amplifier and a filtering and amplifying circuit. Wherein the MCU main control unit can realize the selection of a transmitting function and a receiving function through the switching unit, modulates an instruction into an electric signal with a certain frequency in a transmitting state, carries out gain amplification through the power amplifier, and finally transmits the signal through the communication coil. In a receiving state, a modulation signal can be received according to the communication coil, an interference signal in a transmission process is filtered through the filter circuit, and then the interference signal enters a master control to complete demodulation of an instruction after passing through the amplification circuit.

Description

Technical Field

[0001] This invention relates to the field of oil and gas exploration technology, specifically to a downhole wireless two-way communication circuit. Background Technology

[0002] In the oil and gas field development process, in order to understand the working status of the drill bit and formation parameters during drilling, it is necessary to upload the drill bit parameters and formation parameters collected near the drill bit location to the ground for data analysis. At this time, it is necessary to realize wireless communication across the drill bit for data transmission. This method is low cost and highly versatile, and is currently the mainstream method used by near-bit measurement-while-drilling instruments. However, this method is usually one-way communication and uses the maximum transmission power to ensure the success rate of communication. It cannot adjust the transmission power according to the signal strength received by the wireless receiver. This results in a lot of wasted power when the medium in the small gap channel formed by the drill string and mud absorbs less electromagnetic wave energy, that is, the electromagnetic wave signal attenuation is small. On the other hand, when the medium in the channel absorbs more electromagnetic wave energy, that is, the electromagnetic wave signal attenuation is large, the communication quality drops sharply due to excessive signal attenuation. Summary of the Invention

[0003] To address this, this invention provides a downhole wireless two-way communication circuit to solve the technical problems of existing technologies in oil and gas field development, which involve one-way communication, fixed transmission power, and inability to adjust according to signal strength, resulting in wasted power consumption and unstable communication quality.

[0004] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0005] According to a first aspect of the present invention, a downhole wireless two-way communication circuit is provided, the circuit comprising:

[0006] The main control unit (1) is used to control communication mode switching, signal modulation and demodulation and data processing;

[0007] Transmit / receive switching unit (2), connected to main control unit (1), is used to switch between transmit mode and receive mode;

[0008] The power amplification unit (3) is connected to the transmit / receive switching unit (2) and amplifies the gain of the modulated signal in the transmit mode;

[0009] The filtering and amplification unit (5) is connected to the transmit / receive switching unit (2) and performs filtering and amplification processing on the received signal in the receive mode;

[0010] The communication coil (6) is coupled to the power amplifier unit (3) and the filter amplifier unit (5) for transmitting or receiving electromagnetic wave signals;

[0011] In the transmission mode, the main control unit (1) modulates the instruction data into a signal packet carrying the current transmission signal strength data, which is then amplified by the power amplifier unit (3) and transmitted through the communication coil (6). In the reception mode, the main control unit (1) demodulates the received signal strength data based on the feedback signal received by the communication coil (6), and dynamically adjusts the next transmission power based on the comparison between the transmission end signal strength carried in the feedback signal and the local reception strength.

[0012] Furthermore, the circuit also includes a tuning unit (4) connected between the power amplifier unit (3) and the communication coil (6) for optimizing the impedance matching of the transmitted signal.

[0013] Furthermore, the main control unit (1) uses phase shift keying modulation for instruction data modulation.

[0014] Furthermore, the transmit / receive switching unit (2) is a radio frequency switch circuit, and its conduction path is controlled by the level signal output by the main control unit (1).

[0015] Furthermore, the specific method for dynamically adjusting the next transmission power is as follows:

[0016] If the main control unit (1) correctly demodulates the feedback signal in the receiving mode, the next transmission power will be reduced by a preset level;

[0017] If the feedback signal is not properly demodulated, the next transmission power will be increased by a preset level.

[0018] Furthermore, when transmitting feedback signals in receive mode, the communication circuit transmits feedback data with a power level at least one level lower than the current power of the transmitter.

[0019] Furthermore, the filtering and amplification unit (5) includes a bandpass filter circuit and a low-noise amplifier circuit, used to filter out out-of-band interference and amplify the effective signal.

[0020] Furthermore, the communication coil (6) is a solenoid inductor with a working frequency range of 1kHz-100kHz.

[0021] Furthermore, the preset level is 5%-10% of the maximum output power of the power amplifier unit (3).

[0022] Furthermore, the main control unit (1) is an MCU microcontroller that integrates a PSK modem and power control algorithm.

[0023] The embodiments of the present invention have the following advantages:

[0024] This invention provides a solution compatible with both transmission and reception of communication signals, comprising an MCU main control unit, a transmit / receive switching unit, a power amplifier, and filtering and amplification circuits. The MCU main control unit can select between transmit and receive functions via the switching unit. In transmit mode, the command is modulated into an electrical signal of a specific frequency, amplified by the power amplifier, and then transmitted via the communication coil. In receive mode, based on the modulated signal received by the communication coil, interference signals during transmission are first filtered out by the filtering circuit, and then the signal is amplified before entering the main control unit to demodulate the command. Attached Figure Description

[0025] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0026] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0027] Figure 1 This is a schematic diagram of the logical structure topology of a downhole wireless two-way communication circuit provided in an embodiment of the present invention.

[0028] 1. Main control unit; 2. Transmit / receive switching unit; 3. Power amplifier unit; 4. Tuning unit; 5. Filtering and amplification unit; 6. Communication coil. Detailed Implementation

[0029] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In order to solve the technical problems mentioned above in the oil and gas field development process, such as one-way communication, fixed transmission power and inability to adjust according to signal strength, which leads to power waste and unstable communication quality.

[0031] refer to Figure 1 This invention discloses an underground wireless two-way communication circuit, comprising: a main control unit 1 for controlling communication mode switching, signal modulation and demodulation, and data processing; a transmit / receive switching unit 2 connected to the main control unit 1 for switching between transmit and receive modes; a power amplifier unit 3 connected to the transmit / receive switching unit 2 for amplifying the modulated signal in transmit mode; a filter amplifier unit 5 connected to the transmit / receive switching unit 2 for filtering and amplifying the received signal in receive mode; and a communication coil 6 coupled to the power amplifier unit 3 and the filter amplifier unit 5 for transmitting or receiving electromagnetic wave signals.

[0032] In the transmission mode, the main control unit 1 modulates the command data into a signal packet carrying the current transmission signal strength data, which is then amplified by the power amplifier unit 3 and transmitted through the communication coil 6. In the reception mode, the main control unit 1 demodulates the received signal strength data based on the feedback signal received by the communication coil 6, and dynamically adjusts the next transmission power based on the comparison between the transmission signal strength carried in the feedback signal and the local reception strength.

[0033] Furthermore, the circuit also includes a tuning unit 4 connected between the power amplifier unit 3 and the communication coil 6, used to optimize the impedance matching of the transmitted signal.

[0034] Furthermore, the main control unit 1 uses phase shift keying modulation for command data modulation.

[0035] Furthermore, the transmit / receive switching unit 2 is a radio frequency switch circuit, and its conduction path is controlled by the level signal output by the main control unit 1.

[0036] Furthermore, the specific method for dynamically adjusting the next transmission power is as follows:

[0037] If the main control unit 1 correctly demodulates the feedback signal in the receiving mode, the next transmission power will be reduced by a preset level; if the feedback signal is not correctly demodulated, the next transmission power will be increased by a preset level.

[0038] Furthermore, when transmitting feedback signals in receive mode, the communication circuit transmits feedback data with a power level at least one level lower than the current power of the transmitter.

[0039] Furthermore, the filtering and amplification unit 5 includes a bandpass filter circuit and a low-noise amplification circuit, used to filter out out-of-band interference and amplify the effective signal.

[0040] Furthermore, the communication coil 6 is a solenoid inductor with an operating frequency range of 1kHz-100kHz.

[0041] Furthermore, the preset level is 5%-10% of the maximum output power of the power amplifier unit 3.

[0042] Furthermore, the main control unit 1 is an MCU microcontroller that integrates a PSK modem and power control algorithm.

[0043] When the main control circuit board is in the transmitting state, it encodes the received command data and modulates it into a signal of a certain frequency using phase shift keying (PSK). The signal is then transmitted through the power amplifier circuit and the communication coil.

[0044] When in transmit mode, data containing the strength of the transmitted signal will be added to the transmitted data. After receiving the transmitted data, another circuit board in receive mode can transmit corresponding feedback data, which is the data of the strength of the received signal received by the receiving system.

[0045] When the main control circuit board is in receive mode, the communication coil receives the modulation signal. After filtering out interference signals during transmission, the signal is demodulated by the amplifier circuit. When the circuit board in receive mode transmits feedback data, it uses a power level one level lower than that of the transmitter board. If the wireless transmitter board can receive the correct data, it means that there is still a margin in the transmission power, and the power can be further reduced. If the wireless transmitter board does not receive the correct data, it means that the transmission power has reached the critical value and the power needs to be increased for the next transmission.

[0046] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A downhole wireless two-way communication circuit, characterized in that, The circuit includes: The main control unit (1) is used to control communication mode switching, signal modulation and demodulation and data processing; Transmit / receive switching unit (2), connected to main control unit (1), is used to switch between transmit mode and receive mode; The power amplification unit (3) is connected to the transmit / receive switching unit (2) and amplifies the gain of the modulated signal in the transmit mode; The filtering and amplification unit (5) is connected to the transmit / receive switching unit (2) and performs filtering and amplification processing on the received signal in the receive mode; The communication coil (6) is coupled to the power amplifier unit (3) and the filter amplifier unit (5) for transmitting or receiving electromagnetic wave signals; In the transmission mode, the main control unit (1) modulates the instruction data into a signal packet carrying the current transmission signal strength data, which is then amplified by the power amplifier unit (3) and transmitted through the communication coil (6). In the reception mode, the main control unit (1) demodulates the received signal strength data based on the feedback signal received by the communication coil (6), and dynamically adjusts the next transmission power based on the comparison between the transmission end signal strength carried in the feedback signal and the local reception strength.

2. The downhole wireless two-way communication circuit as described in claim 1, characterized in that, The circuit also includes a tuning unit (4) connected between the power amplifier unit (3) and the communication coil (6) for optimizing the impedance matching of the transmitted signal.

3. The downhole wireless two-way communication circuit as described in claim 1, characterized in that, The main control unit (1) uses phase shift keying modulation for command and data modulation.

4. The downhole wireless two-way communication circuit as described in claim 3, characterized in that, The transmit / receive switching unit (2) is a radio frequency switch circuit, and its conduction path is controlled by the level signal output by the main control unit (1).

5. The downhole wireless two-way communication circuit as described in claim 4, characterized in that, The specific method for dynamically adjusting the next transmission power is as follows: If the main control unit (1) correctly demodulates the feedback signal in the receiving mode, the next transmission power will be reduced by a preset level; If the feedback signal is not properly demodulated, the next transmission power will be increased by a preset level.

6. The downhole wireless two-way communication circuit as described in claim 5, characterized in that, When transmitting feedback signals in receive mode, the communication circuit transmits feedback data at a power level at least one level lower than the current power of the transmitter.

7. The downhole wireless two-way communication circuit as described in claim 6, characterized in that, The filtering and amplification unit (5) includes a bandpass filter circuit and a low-noise amplifier circuit, which are used to filter out interference outside the frequency band and amplify the effective signal.

8. The downhole wireless two-way communication circuit as described in claim 6, characterized in that, The communication coil (6) is a solenoid inductor with a working frequency range of 1kHz-100kHz.

9. A downhole wireless two-way communication circuit as described in claim 6, characterized in that, The preset level is 5%-10% of the maximum output power of the power amplifier unit (3).

10. A downhole wireless two-way communication circuit as described in claim 6, characterized in that, The main control unit (1) is an MCU microcontroller that integrates a PSK modem and power control algorithm.

Images