High-frequency pulse water sound wave communication system and communication method for water injection well

Abstract

The invention provides a high-frequency pulse water sound wave communication system and communication method for a water injection well, and the communication system comprises a ground control system which is installed on a well site water injection pipeline; the ground control system comprises a ground control unit, a flow adjusting unit, a ground water sound wave receiving unit and a ground water sound wave transmitting unit. The flow adjusting unit, the ground water sound wave receiving unit and the ground water sound wave transmitting unit are all connected with the ground control unit. The underground water distributor comprises an underground control unit, an underground water sound wave receiving unit and an underground water sound wave transmitting unit; the underground water sound wave receiving unit and the underground water sound wave transmitting unit are both connected with the underground control unit. According to the scheme, during wireless transmission of the water injection well, the data transmission rate is high, the anti-interference capacity is high, and long-distance propagation loss is small.

Description

Technical Field

[0001] The present invention belongs to the technical field of wireless communication, and in particular relates to a high-frequency pulse water acoustic wave communication system and a communication method for water injection wells. Background Art

[0002] With the development of informatization and intelligence of downhole tools, the requirements of real-time decision-making and closed-loop control on the ground, and the demand for real-time data interaction between the ground and the underground are increasing. At present, the wireless communication technologies of water injection wells mainly include wave code communication and electromagnetic wave communication: wave code communication is easily limited by the signal generation mode, power consumption, and signal detection sensor, and the transmission rate is slow, which cannot meet the real-time data requirements of water injection wells; electromagnetic wave transmission is greatly affected by the resistivity of the formation, and the long-distance attenuation is serious. The position of the ground receiving device is not easy to be laid. The acoustic wave wireless transmission adopts the longitudinal wave transmission mode, and part of the energy is lost in the liquid in the well. The transmission distance is limited, and repeaters need to be added every 300 to 600 meters, which increases the cost. Summary of the invention

[0003] The purpose of the embodiments of this specification is to provide a high-frequency pulse water acoustic wave communication system and communication method for water injection wells.

[0004] To solve the above technical problems, the embodiments of the present application are implemented in the following ways: In a first aspect, the present application provides a high-frequency pulse hydroacoustic wave communication system for a water injection well, comprising: A ground control system is installed on the water injection pipeline of the well site; the ground control system includes: a ground control unit, a flow regulating unit, a ground water acoustic wave receiving unit, and a ground water acoustic wave transmitting unit, and the flow regulating unit, the ground water acoustic wave receiving unit, and the ground water acoustic wave transmitting unit are all connected to the ground control unit; The ground control unit sends a first pulse transmission command to the ground hydroacoustic wave transmitting unit; The ground hydroacoustic wave transmitting unit transmits a first high-frequency pulse wave signal according to a first pulse transmitting command; The ground control unit also controls the regulator of the flow regulating unit to adjust the valve opening and switching frequency, so that the first high-frequency pulse wave signal propagates in the well site water injection pipeline in the form of longitudinal waves with the high-pressure water injected from the water injection well as the medium carrier; A downhole water distributor, the downhole water distributor comprises: a downhole control unit, a downhole water acoustic wave receiving unit and a downhole water acoustic wave transmitting unit; the downhole water acoustic wave receiving unit and the downhole water acoustic wave transmitting unit are both connected to the downhole control unit; The downhole hydroacoustic wave receiving unit receives the first high-frequency pulse wave signal and sends it to the downhole control unit so that the downhole control unit analyzes it to control the water nozzle opening and adjust the injection water volume; The downhole control unit also sends a second pulse transmission command to the downhole hydroacoustic wave transmitting unit; The downhole hydroacoustic wave transmitting unit transmits a second high-frequency pulse wave signal according to the second pulse transmitting command; the second high-frequency pulse wave signal propagates in the well site water injection pipeline in the form of longitudinal waves using the high-pressure water injected from the water injection well as a medium carrier; The ground hydroacoustic wave receiving unit receives the second high-frequency pulse wave signal and sends it to the ground control unit so that the ground control unit analyzes it to obtain a second analysis signal.

[0005] In one embodiment, the ground control system further comprises: A first pressure sensor is used to collect ground water inlet pressure data; The second pressure sensor is used to collect ground water outlet pressure data; A surface flow measurement unit, used for measuring surface flow data; The first pressure sensor, the second pressure sensor, and the ground flow measurement unit are all connected to the ground control unit; A display unit connected to the ground control unit and used to display ground water inlet pressure data, ground water outlet pressure data, ground flow data, a second analytical signal, and valve opening data in the flow regulating unit; The opening data of the valve in the flow regulating unit is collected by the flow regulating unit.

[0006] In a second aspect, the present application provides a communication method of the high-frequency pulse water acoustic wave communication system for water injection wells based on the first aspect, the communication method comprising: The ground control unit controls the regulator of the flow regulating unit to adjust the opening of the valve to adjust the amount of injected water in the water injection pipe of the well site; The ground control unit sends a first pulse transmission command to the ground hydroacoustic wave transmitting unit; After receiving the first pulse transmission command, the surface hydroacoustic wave transmitting unit transmits a first high-frequency pulse wave signal to the downhole hydroacoustic wave receiving unit; the first high-frequency pulse wave signal propagates in the well site water injection pipeline; The downhole hydroacoustic wave receiving unit sends the received first high-frequency pulse wave signal to the downhole control unit; The downhole control unit analyzes the received first high-frequency pulse wave signal to obtain a first analysis signal; The downhole control unit adjusts the opening of the water nozzle according to the first analytical signal to adjust the amount of water injected into the corresponding downhole water distributor; The downhole control unit sends a second pulse transmission command to the downhole hydroacoustic wave transmitting unit; After receiving the second pulse transmission command, the downhole hydroacoustic wave transmitting unit transmits a second high-frequency pulse wave signal to the surface hydroacoustic wave receiving unit; the second high-frequency pulse wave signal propagates in the well site water injection pipeline; The ground hydroacoustic wave receiving unit sends the received second high-frequency pulse wave signal to the ground control unit; The ground control unit analyzes the second high-frequency pulse wave signal to obtain a second analysis signal.

[0007] In one of the embodiments, the ground control unit also controls the regulator of the flow regulating unit to adjust the switching frequency of the valve so that the first high-frequency pulse wave signal and the second high-frequency pulse wave signal are propagated in the well site injection pipeline in the form of longitudinal waves with the high-pressure water injected by the injection well as the medium carrier.

[0008] In one embodiment, the encoding of the first high-frequency pulse wave signal includes a wake-up code, a first device address code, a first data code, and a first check code; The wake-up code indicates the duration of the first high-frequency pulse wave signal, which is greater than the sleep interval of the downhole water distributor. When the downhole water distributor detects the first high-frequency pulse wave signal, the downhole water distributor is awakened and enters the real-time dynamic monitoring mode. The first device address code indicates the device address of the downhole water distributor; The first data code represents the instruction transmitted by the surface control unit to the downhole water distributor; The first check code adopts binary even check.

[0009] In one of the embodiments, a waiting time is set between the wake-up code and the first device address code to ensure that the downhole water distributor can correctly and completely receive the instructions of the surface control unit.

[0010] In one embodiment, the encoding of the second high-frequency pulse wave signal includes a start code, a second device address code, a second data code, and a second check code; The second device address code indicates the device address of the downhole water distributor; The second data code represents information transmitted from the downhole control unit to the surface control system; The second check code adopts binary even check.

[0011] In one of the embodiments, the ground water acoustic wave transmitting unit uses high-precision filtering and denoising recognition technology to filter and denoise the collected original signal to obtain a first high-frequency pulse wave signal.

[0012] In one embodiment, the amplitude of the first high-frequency pulse wave signal is greater than twice the amplitude of the background noise; The amplitude of the second high-frequency pulse wave signal is greater than twice the amplitude of the background noise.

[0013] In one of the embodiments, the ground control unit sends ground water inlet pressure data, ground water outlet pressure data, valve opening data in the flow regulating unit, ground flow data, and a second analysis signal to the display unit for display on the display unit.

[0014] It can be seen from the technical solution provided in the above embodiments of this specification that: Compared with ordinary pulse wave signals, the first high-frequency pulse wave signal and the second high-frequency pulse wave signal respectively emitted by the ground water acoustic wave transmitting unit and the downhole water acoustic wave transmitting unit have a wider bandwidth, can carry more information, improve the data transmission rate, and are more suitable for high-speed underwater communication; the ground control unit controls the rapid switching of the regulator to generate extremely short sound wave pulses, improves the time resolution, and realizes accurate positioning and identification; in addition, the ground control unit controls the rapid switching of the regulator, so that the first high-frequency pulse wave signal and the second high-frequency pulse wave signal use high-pressure water as the medium carrier, and the wavelength propagated in the water is much smaller than the low-frequency wave, which has better directivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 A schematic diagram of the structure of a high-frequency pulse water acoustic wave communication system for water injection wells provided in this application; Figure 2 The structural block diagram of the ground control system provided for this application; Figure 3 A schematic diagram of encoding of a first high-frequency pulse wave signal provided in this application; Figure 4 A schematic diagram of encoding of a second high-frequency pulse wave signal provided in this application; Figure 5 Schematic diagram of wavelet decomposition and denoising provided for this application; Figure 6 Schematic diagram of the wavelet decomposition denoising process provided for this application. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this specification.

[0018] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0019] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present application description without departing from the scope or spirit of the present application. Other embodiments derived from the present application description will be apparent to those skilled in the art. The present application description and examples are exemplary only.

[0020] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0021] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0022] Reference Figure 1 , which shows a schematic diagram of the structure of a high-frequency pulse water acoustic wave communication system for water injection wells provided in an embodiment of the present application. Figure 2 It shows a structural block diagram of a ground control system in a high-frequency pulse hydroacoustic wave communication system for water injection wells provided in an embodiment of the present application.

[0023] like Figure 1 As shown, the high-frequency pulse water acoustic wave communication system for water injection wells may include: The ground control system 1 is installed on the water injection pipeline of the well site; Figure 2 As shown, the ground control system 1 includes: a ground control unit 101, a flow regulating unit 102, a ground water acoustic wave receiving unit 104, and a ground water acoustic wave transmitting unit 103, and the flow regulating unit 102, the ground water acoustic wave receiving unit 104, and the ground water acoustic wave transmitting unit 103 are all connected to the ground control unit 101; The ground control unit 101 sends a first pulse transmission command to the ground hydroacoustic wave transmitting unit 103; The ground hydroacoustic wave transmitting unit 103 transmits a first high-frequency pulse wave signal according to the first pulse transmitting command; The surface control unit 101 also controls the regulator of the flow regulating unit 102 to adjust the valve opening and switching frequency, so that the first high-frequency pulse wave signal propagates in the well site water injection pipeline in the form of longitudinal waves with the high-pressure water injected from the water injection well as the medium carrier; The downhole water distributor 2 includes: a downhole control unit (not shown in the figure), a downhole water acoustic wave receiving unit 201 and a downhole water acoustic wave transmitting unit 202; the downhole water acoustic wave receiving unit 201 and the downhole water acoustic wave transmitting unit 202 are both connected to the downhole control unit; The downhole hydroacoustic wave receiving unit 201 receives the first high-frequency pulse wave signal and sends it to the downhole control unit so that the downhole control unit analyzes it to control the water nozzle opening and adjust the injection water volume; The downhole control unit also sends a second pulse transmission command to the downhole hydroacoustic wave transmitting unit 202; The downhole hydroacoustic wave transmitting unit 202 transmits a second high-frequency pulse wave signal according to the second pulse transmitting command; the second high-frequency pulse wave signal propagates in the well site water injection pipeline in the form of longitudinal waves using the high-pressure water injected from the water injection well as a medium carrier; The surface hydroacoustic wave receiving unit 104 receives the second high-frequency pulse wave signal and sends it to the surface control unit 101 so that the surface control unit 101 analyzes it to obtain a second analysis signal.

[0024] Specifically, after receiving the first pulse transmission command from the ground control unit 101, the ground water acoustic wave transmitting unit 103 generates a high-frequency pulse wave of 0.2~2HZ. At the same time, the ground control unit 101 controls the regulator of the flow regulating unit 102 to adjust the valve for rapid switching. For example, the switching time is 5S. The ground water acoustic wave transmitting unit 103 transmits a first high-frequency pulse wave signal of a fixed frequency. The signal propagates in the well field water injection pipeline in the form of longitudinal waves with the high-pressure water injected by the water injection well as the medium carrier. Similarly, the second high-frequency pulse wave signal generated by the downhole water distributor 2 propagates in the well field water injection pipeline in the form of longitudinal waves with the high-pressure water injected by the water injection well as the medium carrier. This avoids the defects of the traditional water acoustic wave communication system, which is usually limited by low frequency and narrow bandwidth, resulting in low data transmission rate and susceptibility to multipath effect and noise interference.

[0025] The high-frequency pulse hydroacoustic wave communication system for water injection wells provided in the embodiment of the present application comprises a first high-frequency pulse wave signal and a second high-frequency pulse wave signal respectively emitted by a ground hydroacoustic wave transmitting unit and a downhole hydroacoustic wave transmitting unit. Compared with ordinary pulse wave signals, these signals have a wider bandwidth, can carry more information, and improve the data transmission rate, making them more suitable for high-speed underwater communications. The ground control unit controls the rapid switching of the regulator to generate extremely short acoustic wave pulses, thereby improving the time resolution and achieving accurate positioning and identification. In addition, the ground control unit controls the rapid switching of the regulator, so that the first high-frequency pulse wave signal and the second high-frequency pulse wave signal use high-pressure water as the medium carrier, and the wavelength propagated in the water is much smaller than that of the low-frequency wave, thereby having better directivity.

[0026] In one embodiment, continue to refer to Figure 1 , Figure 2 , the ground control system 1 also includes: The first pressure sensor 105 is used to collect the surface water inlet pressure data; The second pressure sensor 108 is used to collect ground water outlet pressure data; A ground flow measurement unit 106, used to measure ground flow data; The first pressure sensor 105 , the second pressure sensor 108 , and the surface flow measurement unit 106 are all connected to the surface control unit 101 ; The display unit 107 is connected to the ground control unit 101 and is used to display the ground water inlet pressure data, the ground water outlet pressure data, the ground flow data, the second analytical signal, and the opening data of the valve in the flow regulating unit 102; The opening data of the valve in the flow regulating unit 102 is collected by the flow regulating unit 102 .

[0027] Specifically, the display unit 107 can be set on-site for viewing by on-site staff, or can be set in the control center for viewing by staff; it can also be set both on-site and in the control center. When set in the control center, data can be transmitted to the control center for display via a wired or wireless network, and the ground control unit 101 can also receive control commands issued by the control center to achieve two-way communication between the ground and the underground.

[0028] The present application also provides a communication method of the high-frequency pulse water acoustic wave communication system for water injection wells in the above embodiment, the communication method comprising: The surface control unit 101 controls the regulator of the flow regulating unit 102 to adjust the opening of the valve to adjust the amount of injected water in the well site water injection pipe; The ground control unit 101 sends a first pulse transmission command to the ground hydroacoustic wave transmitting unit 103; After receiving the first pulse transmission command, the surface hydroacoustic wave transmitting unit 103 transmits a first high-frequency pulse wave signal to the downhole hydroacoustic wave receiving unit 201; the first high-frequency pulse wave signal propagates in the well site water injection pipeline; The downhole hydroacoustic wave receiving unit 201 sends the received first high-frequency pulse wave signal to the downhole control unit; The downhole control unit analyzes the received first high-frequency pulse wave signal to obtain a first analysis signal; The downhole control unit adjusts the opening of the water nozzle according to the first analytical signal to adjust the amount of water injected into the corresponding downhole water distributor 2; The downhole control unit sends a second pulse transmission command to the downhole hydroacoustic wave transmitting unit 202; After receiving the second pulse transmission command, the downhole hydroacoustic wave transmitting unit 202 transmits a second high-frequency pulse wave signal to the surface hydroacoustic wave receiving unit 104; the second high-frequency pulse wave signal propagates in the well site water injection pipeline; The surface hydroacoustic wave receiving unit 104 sends the received second high-frequency pulse wave signal to the surface control unit 101; The ground control unit 101 analyzes the second high-frequency pulse wave signal to obtain a second analysis signal.

[0029] In one embodiment, the ground control unit 101 also controls the regulator of the flow regulating unit 102 to adjust the switching frequency of the valve so that the first high-frequency pulse wave signal and the second high-frequency pulse wave signal propagate in the well site injection pipeline in the form of longitudinal waves with the high-pressure water injected by the injection well as the medium carrier.

[0030] In the noisy environment underground and over a thousand meters of transmission distance, in order to increase the effective propagation distance of the signal, overcome the complexity of the underwater acoustic channel, and ensure that the communication remains clear and reliable at a longer distance, the ground control unit detects the acoustic vibration amplitude of pulse waves with different amplitudes on the pipe string. The pulse wave with an amplitude greater than 2 times the background noise is the best transmission state. The larger signal amplitude helps to separate the signal from the background noise at the receiving end and reduce the bit error rate, thereby ensuring the stability and accuracy of the communication. Subsequent operations use this pulse wave amplitude for acoustic transmission operations.

[0031] In one embodiment, the amplitude of the first high-frequency pulse wave signal is greater than twice the amplitude of the background noise; the amplitude of the second high-frequency pulse wave signal is greater than twice the amplitude of the background noise.

[0032] Furthermore, in combination with the propagation characteristics of the first high-frequency pulse wave signal and the second high-frequency pulse wave signal, binary amplitude keying digital modulation technology (2ASK) is adopted, and sound waves are used as the information carrying medium, that is, the amplitude of the carrier is modulated by digital data to take different values. For example, the low state of the carrier amplitude within the unit time T corresponds to binary "0"; the high state of the carrier amplitude within the unit time T corresponds to binary "1".

[0033] Furthermore, the system encoding rule adopts linear piecewise binary encoding.

[0034] In one embodiment, the encoding of the first high-frequency pulse wave signal includes a wake-up code, a first device address code, a first data code, and a first check code; The wake-up code indicates the duration of the first high-frequency pulse wave signal, which is greater than the sleep interval of the downhole water distributor. When the downhole water distributor 2 detects the first high-frequency pulse wave signal, the downhole water distributor 2 is awakened and enters the real-time dynamic monitoring mode. The first device address code indicates the device address of the downhole water distributor 2; The first data code represents the instruction transmitted by the surface control unit 101 to the downhole water distributor 2; The first check code adopts binary even check.

[0035] In one embodiment, a waiting time is set between the wake-up code and the first device address code to ensure that the downhole water distributor 2 can correctly and completely receive the instruction of the surface control unit 101 .

[0036] Specifically, the encoding of the first high-frequency pulse wave signal emitted by the ground control unit 101 to the downhole water distributor 2 includes a wake-up code, a first device address code, a first data code and a first check code; the wake-up code is S, which represents the duration of the infrasound signal, i.e., the first high-frequency pulse wave signal, which is greater than the sleep interval of the downhole water distributor 2. When the downhole water distributor 2 detects the infrasound signal, it is awakened and enters the real-time dynamic monitoring mode. There is a waiting time N between the wake-up code and the first device address code to ensure that the downhole water distributor 2 can correctly and completely receive the instructions of the ground control unit 101; the number of bits of the binary code of the first device address code can be based on It is set according to actual needs. For example, the first device address code is composed of 3-bit binary code, that is, there are 23=8 types in total, which respectively represent the device addresses of the underground water distributors 2 on the first to eighth floors; the number of bits of the binary code of the first data code can be set according to actual needs. For example, the first data code is composed of 8-bit binary code, that is, there are 28=256 types in total. Different instructions are transmitted according to different numbers. Different instructions can represent the opening of the water nozzle of the corresponding underground water distributor 2, the size of underground pressure, layered flow data, etc. The corresponding relationship between the instructions and the meaning is set in advance; the first check code adopts binary even check. For example, Figure 3 The first device address code is 100, which means 4, and the first data code is 01110101, which means 117. Therefore, the information transmitted by the ground control unit 101 to the downhole water distributor 2 is that the fourth-layer downhole water distributor 2 executes the 117 instruction.

[0037] In one embodiment, the encoding of the second high-frequency pulse wave signal includes a start code, a second device address code, a second data code, and a second check code; The second device address code indicates the device address of the downhole water distributor 2; The second data code represents the information transmitted from the downhole control unit to the surface control system 1; The second check code adopts binary even check.

[0038] Specifically, the encoding of the second high-frequency pulse wave signal emitted by the downhole water distributor 2 to the ground control unit 101 includes a start code, a second device address code, a second data code, and a second check code. The number of bits of the binary code of the second device address code can be set according to actual needs. For example, the second device address code is composed of 3-bit binary codes, with a total of 23=8 types, which respectively represent the device addresses of the downhole water distributors 2 from the first to the eighth layers; the number of bits of the binary code of the second data code can be set according to actual needs. The second data code represents the measured underground pressure data, stratified flow data, etc. of the corresponding downhole water distributor 2. For example, the second data code is composed of 10-bit binary codes, with a total of 210=1024 numbers. The downhole data transmits 3 valid digits, which are tens, ones, and decimal places; the second check code adopts binary even check. For example, Figure 4 The second device address code is 110, which means 6, and the second data code is 1001101111, which means 623. Therefore, the information transmitted by the downhole water distributor 2 to the ground control unit 101 is that the stratified flow rate of the sixth-layer downhole water distributor 2 is 62.3 cubic meters / day.

[0039] In one embodiment, the surface water acoustic wave transmitting unit 103 uses a high-precision filtering and denoising recognition technology to filter and denoise the collected original signal to obtain a first high-frequency pulse wave signal.

[0040] Specifically, denoising technology mainly uses the wavelet decomposition denoising principle, and its principle is as follows Figure 5 As shown in the figure, wavelet decomposition denoising is mainly based on the time-frequency analysis method of wavelet analysis. It achieves denoising by decomposing the signal into different frequency bands and performing threshold processing on these frequency bands. By setting different thresholds, a higher threshold can be applied to the high frequency band and a lower threshold can be applied to the low frequency band, thereby effectively eliminating noise and retaining the main features of the signal.

[0041] The wavelet decomposition denoising process includes the following steps, and the process is as follows: Figure 6 As shown. First, the original signal is collected and the appropriate wavelet basis function is selected for operation, followed by threshold processing. For the obtained wavelet coefficients, it is usually necessary to set a threshold for processing, and the wavelet coefficients smaller than the threshold are set to zero, while the wavelet coefficients larger than the threshold are retained. Finally, wavelet reconstruction is performed, and the processed wavelet coefficients are subjected to inverse wavelet transform, and the wavelet coefficients and the wavelet basis function are subjected to inverse convolution operation to obtain the restored signal.

[0042] In one embodiment, the ground control unit 101 sends ground water inlet pressure data, ground water outlet pressure data, valve opening data in the flow regulating unit 102 , ground flow data, and a second analysis signal to the display unit 107 for display on the display unit 107 .

[0043] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of further restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0044] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

Claims

1. A high-frequency pulse water acoustic wave communication system for water injection wells, characterized in that: include: A ground control system (1), the ground control system (1) being installed on a water injection pipeline at a well site; The ground control system (1) comprises: a ground control unit (101), a flow regulating unit (102), a ground water acoustic wave receiving unit (104), and a ground water acoustic wave transmitting unit (103); the flow regulating unit (102), the ground water acoustic wave receiving unit (104), and the ground water acoustic wave transmitting unit (103) are all connected to the ground control unit (101); The ground control unit (101) sends a first pulse transmission command to the ground hydroacoustic wave transmitting unit (103); The surface hydroacoustic wave transmitting unit (103) transmits a first high-frequency pulse wave signal according to the first pulse transmitting command; The surface control unit (101) further controls the regulator of the flow regulating unit (102) to adjust the valve opening and switching frequency, so that the first high-frequency pulse wave signal propagates in the well site water injection pipeline in the form of longitudinal waves using the high-pressure water injected from the water injection well as a medium carrier; A downhole water distributor (2), the downhole water distributor (2) comprising: a downhole control unit, a downhole water acoustic wave receiving unit (201) and a downhole water acoustic wave transmitting unit (202); the downhole water acoustic wave receiving unit (201) and the downhole water acoustic wave transmitting unit (202) are both connected to the downhole control unit; The downhole hydroacoustic wave receiving unit (201) receives the first high-frequency pulse wave signal and sends it to the downhole control unit so that the downhole control unit analyzes it to control the opening of the water nozzle and adjust the amount of injected water; The downhole control unit also sends a second pulse emission command to the downhole hydroacoustic wave emission unit (202); The downhole hydroacoustic wave transmitting unit (202) transmits a second high-frequency pulse wave signal according to the second pulse transmitting command; the second high-frequency pulse wave signal uses the high-pressure water injected by the water injection well as a medium carrier to propagate in the water injection pipeline of the well site in the form of a longitudinal wave; The surface hydroacoustic wave receiving unit (104) receives the second high-frequency pulse wave signal and sends it to the surface control unit (101), so that the surface control unit (101) analyzes it to obtain a second analysis signal.

2. The high-frequency pulse water acoustic wave communication system for water injection wells according to claim 1, characterized in that: The ground control system (1) further comprises: A first pressure sensor (105), used to collect surface water inlet pressure data; A second pressure sensor (108), used to collect ground water outlet pressure data; A surface flow measurement unit (106), used for measuring surface flow data; The first pressure sensor (105), the second pressure sensor (108), and the surface flow measurement unit (106) are all connected to the surface control unit (101); a display unit (107), the display unit (107) being connected to the ground control unit (101) and being used for displaying the ground water inlet pressure data, the ground water outlet pressure data, the ground flow data, the second analytical signal, and the opening data of the valve in the flow regulating unit (102); The opening data of the valve in the flow regulating unit (102) is collected by the flow regulating unit (102).

3. A communication method based on the high-frequency pulse water acoustic wave communication system for water injection wells as claimed in claim 1 or 2, characterized in that: The communication method comprises: The ground control unit controls the regulator of the flow regulating unit to adjust the opening of the valve to adjust the amount of injected water in the well site water injection pipe; The ground control unit sends a first pulse transmission command to the ground hydroacoustic wave transmitting unit; After receiving the first pulse transmission command, the surface hydroacoustic wave transmitting unit transmits a first high-frequency pulse wave signal to the downhole hydroacoustic wave receiving unit; the first high-frequency pulse wave signal propagates in the well site water injection pipeline; The downhole hydroacoustic wave receiving unit sends the received first high-frequency pulse wave signal to the downhole control unit; The downhole control unit analyzes the received first high-frequency pulse wave signal to obtain a first analysis signal; The downhole control unit adjusts the opening of the water nozzle according to the first analytical signal to adjust the amount of water injected into the corresponding downhole water distributor; The downhole control unit sends a second pulse transmission command to the downhole hydroacoustic wave transmitting unit; After receiving the second pulse transmission command, the downhole hydroacoustic wave transmitting unit transmits a second high-frequency pulse wave signal to the surface hydroacoustic wave receiving unit; the second high-frequency pulse wave signal propagates in the well site water injection pipeline; The surface hydroacoustic wave receiving unit sends the received second high-frequency pulse wave signal to the surface control unit; The ground control unit analyzes the second high-frequency pulse wave signal to obtain a second analysis signal.

4. The communication method according to claim 3, characterized in that: The ground control unit also controls the regulator of the flow regulating unit to adjust the switching frequency of the valve so that the first high-frequency pulse wave signal and the second high-frequency pulse wave signal are propagated in the well field water injection pipeline in the form of longitudinal waves with the high-pressure water injected by the water injection well as the medium carrier.

5. The communication method according to claim 3, characterized in that: The encoding of the first high-frequency pulse wave signal includes a wake-up code, a first device address code, a first data code, and a first check code; The wake-up code indicates the duration of the first high-frequency pulse wave signal, which is greater than the sleep interval of the downhole water distributor. When the downhole water distributor detects the first high-frequency pulse wave signal, the downhole water distributor is awakened and enters the real-time dynamic monitoring mode. The first device address code represents the device address of the downhole water distributor; The first data code represents the instruction transmitted by the surface control unit to the downhole water distributor; The first check code adopts binary even check.

6. The communication method according to claim 5, characterized in that: A waiting time is provided between the wake-up code and the first device address code to ensure that the downhole water distributor can correctly and completely receive the instruction of the ground control unit.

7. The communication method according to claim 3, characterized in that: The encoding of the second high-frequency pulse wave signal includes a start code, a second device address code, a second data code, and a second check code; The second device address code represents the device address of the downhole water distributor; The second data code represents information transmitted by the downhole control unit to the surface control system; The second check code adopts binary even check.

8. The communication method according to claim 3, characterized in that: The ground water acoustic wave transmitting unit uses high-precision filtering and denoising recognition technology to filter and denoise the collected original signal to obtain the first high-frequency pulse wave signal.

9. The communication method according to claim 3, characterized in that: The amplitude of the first high-frequency pulse wave signal is greater than twice the amplitude of the background noise; The amplitude of the second high-frequency pulse wave signal is greater than twice the amplitude of the background noise.

10. The communication method according to claim 3, characterized in that: The ground control unit sends ground water inlet pressure data, ground water outlet pressure data, valve opening data in the flow regulating unit, ground flow data, and a second analytical signal to the display unit for display on the display unit.

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