A high-precision time-synchronization multi-parameter downhole acoustic positioning system and method

Abstract

The present application belongs to the technical field of downhole acoustic positioning, and particularly relates to a high-precision time-synchronized multi-parameter downhole acoustic positioning system and method, which is composed of a sound signal transmitter, a power amplifier, a transmitting transducer, a reciprocal transducer, a temperature sensor, a pressure sensor, a PTP clock, a data processing module, a receiving transducer and a master display, etc. The transmitting transducer and the reciprocal transducer are synchronized through time synchronization technology, and the temperature and pressure change data of the temperature sensor and the pressure sensor are combined, and then signal solving and distance calculation are performed, so that the positioning information of the reciprocal transducer is finally obtained, and the data is visualized through the master display. Meanwhile, the multi-parameter downhole acoustic positioning system also has a standby function, and the system will be in a standby state when the measurement is stopped. The present application solves the problem of low positioning accuracy, can realize downhole acoustic positioning, and has the advantages of high positioning accuracy, wide dynamic measurement range and long-time working.

Description

Technical Field

[0001] This invention belongs to the field of downhole acoustic positioning technology, specifically relating to a high-precision time-synchronized multi-parameter downhole acoustic positioning system and method. Background Technology

[0002] Downhole acoustic positioning technology is a technique that uses sound waves to determine the location of target objects or equipment in enclosed environments such as oil and gas wells and underground pipelines. Compared with electromagnetic wave positioning, sound waves are less susceptible to electromagnetic interference and have better propagation and less attenuation in liquid media, thus providing more stable and accurate positioning signals in environments such as oil and gas wells and underground pipelines. This makes acoustic positioning technology widely used in complex downhole environments, which is of great significance for ensuring production safety and improving work efficiency.

[0003] In practical applications, due to the complexity of the underground environment, positioning accuracy is often affected by environmental noise and reflections. High-precision time synchronization technology can ensure time synchronization between various measurement points, greatly reducing positioning errors caused by time deviations. Furthermore, multi-parameter acoustic positioning technology can more effectively cope with environmental changes and complex conditions, effectively reducing the impact of environmental noise, reflections, and multipath effects on positioning. This technology has significant advantages, especially in special locations such as oil and gas wells, underground pipelines, and confined spaces. By combining multi-parameter acoustic positioning with high-precision time synchronization technology, downhole acoustic positioning can be more accurate and stable in complex environments, thereby improving work efficiency and effectively reducing risks. Summary of the Invention

[0004] In view of the above, the present invention provides a high-precision time-synchronized multi-parameter downhole acoustic positioning system and method, which can realize downhole acoustic positioning and has the advantages of high positioning accuracy, wide dynamic measurement range and long-term operation.

[0005] This invention provides the following technical solution:

[0006] A high-precision time-synchronized multi-parameter downhole acoustic positioning system and method includes: an acoustic signal transmitter for generating pulse signals within the operating frequency band, capable of adjusting signal frequency and amplitude; a power amplifier for amplifying the pulse signals; a transmitting transducer for transmitting the amplified signal downhole; a reciprocal transducer for receiving acoustic signals transmitted from the wellhead and, upon receiving the signal, returning a signal containing various parameter information and the unprocessed raw acquisition signal from downhole; temperature and pressure sensors for measuring temperature and pressure changes at different locations from the wellhead to the downhole via the reciprocal transducer; in addition to temperature and pressure, other physical parameter sensors can be added based on functionality; a transmitting PTP clock and a receiving PTP clock for achieving time synchronization and recording the transmission and reception times of the acoustic signals, wherein the PTP clock... The P-clock is a Precision Time Protocol clock, abbreviated as PTP; the data processing module, located inside the reciprocal transducer, demodulates and processes the acquired acoustic signals by combining temperature, pressure, and time information; the receiving transducer receives the signals transmitted by the downhole reciprocal transducer, and demodulates the received signals through its internal data demodulation module; the data storage module stores the demodulated signals containing various parameter information and the unprocessed original acquired signals; the main control display visualizes the downhole measurement information demodulated by the receiving transducer, can remotely control the transmission and cessation of the transmitting transducer, and provides prompts for successful or unsuccessful positioning from the reciprocal and receiving transducers; the oil and gas well completes the entire downhole acoustic positioning process; the multi-parameter downhole acoustic positioning system also has a standby function, and the system will enter standby mode when measurement stops.

[0007] The output of the acoustic signal transmitter is connected to the input of the power amplifier, and the output of the power amplifier is connected to the input of the transmitting transducer. The transmitting PTP clock is located inside the transmitting transducer. One end of the main control display is connected to the output of the receiving transducer, and the other end is connected to the input of the transmitting transducer. The reciprocal transducer contains a temperature sensor, a pressure sensor, a receiving PTP clock, and a data processing module. The receiving transducer contains a data storage module and a data demodulation module.

[0008] Preferably, the signal generated by the acoustic signal transmitter is a pulse signal, and the frequency range is determined according to the waveguide channel characteristics in the pipe, and it has functions such as adjusting the signal frequency and amplitude.

[0009] Preferably, the power amplifier amplifies the acoustic signal linearly and has the function of adjusting the power level.

[0010] Preferably, the transmitting transducer, reciprocating transducer, and receiving transducer are characterized by high accuracy, wide measurement range, and high stability. After receiving a signal, the reciprocating transducer returns a signal containing various parameter information and the unprocessed original acquisition signal from downhole. After receiving the signal transmitted by the reciprocating transducer, the receiving transducer demodulates the received signal through its internal data demodulation module, and the data storage module stores the demodulated signal containing various parameter information and the unprocessed original acquisition signal.

[0011] Preferably, the measurement errors of the temperature sensor and the pressure sensor are ±1℃ and ±1%FS, respectively, and the collected data are the temperature and pressure at different locations from the wellhead to the downhole.

[0012] Preferably, the synchronization accuracy of the transmit PTP clock and the receive PTP clock is 20 ns, and the frequency stability is 1 ppb.

[0013] Preferably, the sampling frequencies of the reciprocal transducer and the receiving transducer are the product of the acoustic signal frequency and the sampling time, and the acoustic communication between the reciprocal transducer and the receiving transducer is always matched.

[0014] Preferably, the main control display has the functions of visualizing the downhole measurement information demodulated by the receiving transducer; remotely controlling the transmission and stopping of the transmitting transducer; receiving and displaying prompts on the success or failure of positioning sent by the reciprocal transducer and the receiving transducer; highlighting the positioning information of the reciprocal transducer in the well; and simultaneously remotely adjusting the sound pressure value of the signal transmitted by the reciprocal transducer.

[0015] Preferably, the oil and gas well is a light crude oil well and is not affected by external signals.

[0016] Preferably, the multi-parameter downhole acoustic positioning system has a standby function, and the system will be in standby mode when measurement stops.

[0017] A method for a high-precision time-synchronized multi-parameter downhole acoustic positioning system as described above, wherein the acoustic signal transmitter amplifies the power of the acoustic signal through the power amplifier and transmits the acoustic signal downhole through the transmitting transducer, while the transmitting PTP clock starts timing. After the reciprocal transducer receives the acoustic signal, the temperature sensor, pressure sensor, and receiving PTP clock respectively collect temperature, pressure, and time information. The data processing module demodulates and processes the collected data information to obtain the positioning information of the reciprocal transducer. Then, the reciprocal transducer transmits a signal containing downhole parameter information and an unprocessed raw acquisition signal to the wellhead. The receiving transducer receives the signal transmitted by the downhole reciprocal transducer and demodulates the received signal through its internal data demodulation module. The data storage module stores the demodulated signal containing parameter information and the unprocessed raw acquisition signal. Finally, the downhole measurement information demodulated by the receiving transducer is visualized through the main control display, and the positioning information of the reciprocal transducer downhole is highlighted. The specific implementation method is as follows:

[0018] Step 1: Place the reciprocal transducer in the well, ensuring it is not damaged during placement and that it has good signal transmission and reception capabilities. Similarly, ensure the internal temperature sensor, pressure sensor, PTP clock receiver, and data processing module of the reciprocal transducer are not damaged during placement and that they have good signal acquisition, demodulation, and processing capabilities.

[0019] Step 2: Install and fix the acoustic signal transmitter, power amplifier, and main control display at the wellhead position. Install and fix the transmitting transducer and receiving transducer on both sides of the fluid surface in the well, ensuring that the transmitting and receiving transducers are not damaged during installation and placement and have good signal transmission function. At the same time, ensure that the transmitting PTP clock, data storage module, and data demodulation module are not damaged during placement and have good time synchronization and timing, data storage, and data demodulation functions, respectively.

[0020] Step 3: The acoustic signal transmitter transmits an acoustic signal downhole through a power amplifier and a transmitting transducer. The frequency of the signal is f. s The sound pressure level of the signal is P1. The transmitting PTP clock records the time as t1, and the receiving PTP clock receives the signal at time t2. Therefore, the signal propagation time t = t2 - t1. The signal propagation time is then divided into t·f according to the signal frequency. s The temperature value measured by the temperature sensor is [segment number]. The pressure value measured by the pressure sensor is

[0021] If the reciprocating transducer does not receive the sound signal emitted by the transmitting transducer, it sends a prompt message to the main control display, and the power amplifier will automatically adjust its power level. Similarly, if the receiving transducer does not receive the sound signal emitted by the reciprocating transducer, it will also send a prompt message to the main control display, allowing for remote adjustment of the sound pressure level of the sound signal emitted by the reciprocating transducer.

[0022] Step 4: The liquid density ρ in the nth segment of the oil and gas well n With the corresponding temperature T n and pressure P n The relational expression is:

[0023] ρ n (T,P)=ρ0(1-β(T n -T0)+δP n n = 1, 2, 3...t·f s In the formula, ρ0 is the density of light crude oil under standard conditions, which is 0.82 g / cm³. 3 β is the coefficient of thermal expansion of light crude oil, which is 0.00091 / ℃. The reference temperature T0 is 15℃, and δ = 1.5 × 10⁻⁻¹. 5 Pa- 1 It is the pressure coefficient of light crude oil.

[0024] The relationship between the bulk modulus Kn of the nth segment in an oil and gas well and the corresponding temperature Tn and pressure Pn is expressed as follows:

[0025]

[0026] In the formula, K0 = 1500 MPa is the bulk modulus of light crude oil under standard temperature and pressure, and γ = 0.00071 / ℃ is the temperature coefficient of light crude oil.

[0027] The relationship between the sound velocity cn(T,P) of the nth segment in an oil and gas well and the density ρn(T,P) and bulk modulus Kn(T,P) is expressed as follows:

[0028]

[0029] The expression for the relationship between the position information of the reciprocal transducer and the velocity and time in each segment is: cn(T,P) is obtained, multiplied by dt = tn - tn-1 (n = 1, 2, 3 ... t·fs and t0 = 0), and then summed.

[0030]

[0031] Finally, the position information 's' of the reciprocal transducer is obtained, and the position 's' of the reciprocal transducer after demodulation by the receiving transducer, along with the downhole temperature, is displayed on the main control screen. and pressure The system also visualizes time t and highlights the location information of the reciprocal transducer downhole.

[0032] In general, the technical solution conceived by this invention, compared with the prior art, can achieve the following beneficial effects:

[0033] The present invention proposes a high-precision time-synchronized multi-parameter downhole acoustic positioning system and method, which has the advantages of high positioning accuracy, wide dynamic measurement range and long-term operation, and facilitates real-time data acquisition and communication transmission. Attached Figure Description

[0034] Figure 1 This is a block diagram of a high-precision time-synchronized multi-parameter downhole acoustic positioning system according to the present invention;

[0035] Figure 2 This is a positioning schematic diagram of a high-precision time-synchronized multi-parameter downhole acoustic positioning system according to the present invention;

[0036] Figure 3 This is a schematic diagram of the synchronization time positioning of a high-precision time-synchronized multi-parameter downhole acoustic positioning system according to the present invention;

[0037] The markings in the image are as follows:

[0038] 1-Acoustic signal transmitter; 2-Power amplifier; 3-Transmitting transducer; 4-Transmitting PTP clock; 5-Reciprocal transducer; 6-Temperature sensor; 7-Pressure sensor; 8-Receiving PTP clock; 9-Data processing module; 10-Receiving transducer; 11-Data storage module; 12-Data demodulation module; 13-Main control display; 14-Oil and gas well. Detailed Implementation

[0039] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings, so that those skilled in the art can more clearly understand how to practice the present invention. Although the present invention has been described in conjunction with its preferred embodiments, these embodiments are merely illustrative and not intended to limit the scope of the invention.

[0040] Combined with appendix Figure 1As shown, a high-precision time-synchronized multi-parameter downhole acoustic positioning system includes: an acoustic signal transmitter 1, used to generate pulse signals within the working frequency band, with functions such as adjusting signal frequency and amplitude; a power amplifier 2, used to amplify the power of the pulse signals; a transmitting transducer 3, used to transmit the amplified signal downhole; a reciprocal transducer 5, used to receive the acoustic signals transmitted from the wellhead, and after receiving the signal, return a signal containing various parameter information and the unprocessed raw acquisition signal from downhole; a temperature sensor 6 and a pressure sensor 7, used to measure the temperature and pressure changes at different locations from the wellhead to downhole from the reciprocal transducer 5; in addition to temperature and pressure, other physical parameter sensors can be added according to functionality; a transmitting PTP clock 4 and a receiving PTP clock 8, used to achieve time synchronization and record the time of acoustic signal transmission and reception, wherein the PTP clock is a precision PTP clock. The system includes a Precision Time Protocol (PTP) clock; a data processing module 9, located inside the reciprocal transducer 5, which demodulates and processes the acquired acoustic signals by combining temperature, pressure, and time information; a receiving transducer 10, which receives the signals transmitted by the downhole reciprocal transducer 5, and demodulates the received signals through its internal data demodulation module 12; and a data storage module 11, which stores the demodulated signals containing various parameter information and the unprocessed original acquired signals; a main control display 13, which visualizes the downhole measurement information demodulated by the receiving transducer 10, can remotely control the transmission and cessation of the transmitting transducer 3, and provides prompts on whether the positioning was successful or not upon receiving signals from the reciprocal transducer 5 and the receiving transducer 10; an oil and gas well 14, which completes the entire downhole acoustic positioning process; and a multi-parameter downhole acoustic positioning system with a standby function, which enters standby mode when measurement stops.

[0041] The output of the acoustic signal transmitter 1 is connected to the input of the power amplifier 2, the output of the power amplifier 2 is connected to the input of the transmitting transducer 3, the transmitting PTP clock 4 is located inside the transmitting transducer 3, one end of the main control display 13 is connected to the output of the receiving transducer 10, and the other end is connected to the input of the transmitting transducer 3, the reciprocal transducer 5 contains a temperature sensor 6, a pressure sensor 7, a receiving PTP clock 8, and a data processing module 9, and the receiving transducer 10 contains a data storage module 11 and a data demodulation module 12.

[0042] Specifically, the signal generated by the acoustic signal transmitter 1 is a pulse signal, and the frequency range is determined according to the waveguide channel characteristics in the pipe, and it has functions such as adjusting the signal frequency and amplitude.

[0043] Specifically, the power amplifier 2 amplifies the acoustic signal linearly and has the function of adjusting the power level.

[0044] Specifically, the transmitting transducer 3, the reciprocal transducer 5, and the receiving transducer 10 are characterized by high accuracy, wide measurement range, and high stability. After receiving a signal, the reciprocal transducer 5 returns a signal containing various parameter information and an unprocessed original acquisition signal from downhole. After receiving the signal transmitted by the reciprocal transducer 5, the receiving transducer 10 demodulates the received signal through its internal data demodulation module 12 and stores the demodulated signal containing various parameter information and the unprocessed original acquisition signal through its data storage module 11.

[0045] Specifically, the measurement errors of the temperature sensor 6 and the pressure sensor 7 are ±1℃ and ±1%FS, respectively, and the collected data are the temperature and pressure at different locations from the wellhead to the downhole.

[0046] Specifically, the synchronization accuracy of the transmitting PTP clock 4 and the receiving PTP clock 8 is 20ns, and the frequency stability is 1ppb.

[0047] Specifically, the sampling frequency of the reciprocal transducer 5 and the receiving transducer 10 is the product of the acoustic signal frequency and the sampling time, and the acoustic communication between the reciprocal transducer 5 and the receiving transducer 10 is always matched.

[0048] Specifically, the main control display 13 has the functions of visualizing the downhole measurement information demodulated by the receiving transducer 10; remotely controlling the transmission and stopping of the transmitting transducer 3; receiving and displaying the positioning success or failure prompts sent by the reciprocal transducer 5 and the receiving transducer 10; highlighting the positioning information of the reciprocal transducer 5 in the well; and remotely adjusting the sound pressure value of the signal transmitted by the reciprocal transducer 5.

[0049] Specifically, the oil and gas well 14 is a light crude oil well and is not affected by external signals.

[0050] Specifically, the multi-parameter downhole acoustic positioning system has a standby function, and the system will be in standby mode when measurement stops.

[0051] Combination Figure 2 and Figure 3As shown, a method for a high-precision time-synchronized multi-parameter downhole acoustic positioning system as described above involves the acoustic signal transmitter 1 amplifying the acoustic signal power through the power amplifier 2 and transmitting the acoustic signal downhole through the transmitting transducer 3. Simultaneously, the transmitting PTP clock 4 starts timing. After the reciprocal transducer 5 receives the acoustic signal, the temperature sensor 6, pressure sensor 7, and receiving PTP clock 8 respectively collect temperature, pressure, and time information. The data processing module 9 demodulates and processes the collected data information to obtain the positioning information of the reciprocal transducer 5. The reciprocal transducer 5 transmits signals containing downhole parameter information and unprocessed raw acquisition signals to the wellhead. The receiving transducer 10 receives the signals transmitted by the reciprocal transducer 5 downhole, demodulates the received signals through its internal data demodulation module 12, and stores the demodulated signals containing parameter information and unprocessed raw acquisition signals through the data storage module 11. Finally, the downhole measurement information demodulated by the receiving transducer 10 is visualized through the main control display 13, and the positioning information of the reciprocal transducer 5 downhole is highlighted. The specific implementation method is as follows:

[0052] Step 1: Place the reciprocal transducer 5 in the well, ensuring that it is not damaged during placement and that it has good signal transmission and reception capabilities. Similarly, ensure that the temperature sensor 6, pressure sensor 7, PTP clock receiver 8, and data processing module 9 inside the reciprocal transducer 5 are not damaged during placement and that they have good signal acquisition, demodulation, and processing capabilities.

[0053] Step 2: Install and fix the acoustic signal transmitter 1, power amplifier 2, and main control display 13 at the wellhead position. Install and fix the transmitting transducer 3 and receiving transducer 10 on both sides of the well fluid surface, ensuring that the transmitting transducer 3 and receiving transducer 10 are not damaged during installation and placement and have good signal transmission function. At the same time, ensure that the transmitting PTP clock 4, data storage module 11, and data demodulation module 12 are not damaged during placement and have good time synchronization and timing, data storage, and data demodulation functions, respectively.

[0054] Step 3: The acoustic signal transmitter 1 transmits an acoustic signal downhole through the power amplifier 2 and the transmitting transducer 3. The frequency of the signal is f. s The sound pressure level of the signal is P1. The transmitting PTP clock 4 records the time as t1, and the receiving PTP clock 8 receives the signal at time t2. Therefore, the signal propagation time t = t2 - t1. The signal propagation time is then divided into t·f according to the signal frequency. s Section. Temperature sensor 6 measures the temperature value. The pressure value measured by pressure sensor 7 is

[0055] If the reciprocal transducer 5 does not receive the sound signal emitted by the transmitting transducer 3, it sends a prompt message to the main control display 13, and the power amplifier 2 will automatically adjust its power. If the receiving transducer 10 does not receive the sound signal emitted by the reciprocal transducer 5, it will also send a prompt message to the main control display 13, and then remotely adjust the sound pressure level of the sound signal emitted by the reciprocal transducer 5.

[0056] Step 4: Liquid density ρ in the nth segment of oil and gas well 14 n With the corresponding temperature T n and pressure P n The relational expression is:

[0057] ρ n (T,P)=ρ0(1-β(T n -T0)+ρP n n = 1, 2, 3...t·f s In the formula, ρ0 is the density of light crude oil under standard conditions, which is 0.82 g / cm³. 3 β is the coefficient of thermal expansion of light crude oil, which is 0.00091 / ℃. With a reference temperature T0 of 15℃, δ = 1.5 × 10⁻⁶. -5 Pa -1 It is the pressure coefficient of light crude oil.

[0058] The bulk modulus K of the nth segment in oil and gas well 14 n With the corresponding temperature T n and pressure P n The relational expression is:

[0059]

[0060] In the formula, K0 = 1500 MPa is the bulk modulus of light crude oil under standard temperature and pressure, and γ = 0.00071 / ℃ is the temperature coefficient of light crude oil.

[0061] The sound velocity c of the nth segment in oil and gas well 14 n (T,P) and density ρ n (T,P) and bulk modulus K n The relational expression for (T,P) is:

[0062]

[0063] We get c n (T,P) and dt = t for each time interval. n -t n-1 (n=1,2,3...t·f sAnd t0=0) multiplied and summed, the expression for the relationship between the position information of the reciprocal transducer 5 and the velocity and time of each segment is:

[0064]

[0065] Finally, the position information s of the reciprocal transducer 5 is obtained, and the position s of the reciprocal transducer 5 after demodulation by the receiving transducer 10, and the downhole temperature are displayed on the main control display 13. and pressure The system also visualizes time t and highlights the location information of the reciprocal transducer 5 downhole.

[0066] The above description of the embodiments is provided to enable those skilled in the art to understand and apply the present invention. It will be apparent to those skilled in the art that various modifications can be made to the above embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made to the present invention by those skilled in the art based on the disclosure thereof should be within the scope of protection of the present invention.

Claims

1. A high-precision time-synchronized multi-parameter downhole acoustic positioning method, employing a high-precision time-synchronized multi-parameter downhole acoustic positioning system, comprising: A sound signal transmitter (1) is used to generate pulse signals within the operating frequency band; Power amplifier (2) is used to amplify the power of the pulse signal; Transmitting transducer (3) is used to transmit the amplified signal downhole; reciprocal transducer (5) is used to receive the acoustic signal transmitted from the wellhead and, after receiving the signal, return the signal containing various parameter information and the unprocessed raw acquisition signal from downhole; temperature sensor (6) and pressure sensor (7) are used to measure the temperature and pressure changes of the reciprocal transducer (5) from the wellhead to different locations downhole; transmitting PTP clock (4) and receiving PTP clock (8) are used to achieve time synchronization and record the time of acoustic signal transmission and reception; data processing module (9), located inside the reciprocal transducer (5), demodulates and processes the acquired acoustic signal by combining temperature, pressure and time information; receiving transducer (10) The system is used to receive signals transmitted by the downhole reciprocal transducer (5) and demodulate the received signals through its internal data demodulation module (12). The data storage module (11) stores the demodulated signals containing various parameter information and the unprocessed original acquisition signals. The main control display (13) is used to visualize the downhole measurement information demodulated by the receiving transducer (10), remotely control the transmission and stopping of the transmitting transducer (3), and receive prompts on whether the positioning is successful or not from the reciprocal transducer (5) and the receiving transducer (10). The oil and gas well (14) is used to complete the entire process of downhole acoustic positioning. At the same time, the multi-parameter downhole acoustic positioning system also has a standby function. When the measurement stops, the system will be in standby mode. The output of the acoustic signal transmitter (1) is connected to the input of the power amplifier (2), the output of the power amplifier (2) is connected to the input of the transmitting transducer (3), the transmitting PTP clock (4) is located inside the transmitting transducer (3), one end of the main control display (13) is connected to the output of the receiving transducer (10), and the other end is connected to the input of the transmitting transducer (3). The reciprocal transducer (5) contains a temperature sensor (6), a pressure sensor (7), a receiving PTP clock (8), and a data processing module (9). The receiving transducer (10) contains a data storage module (11) and a data demodulation module (12). The device is characterized by including: Step 1: Place the reciprocal transducer (5) in the well; Step 2: Install and fix the acoustic signal transmitter (1), power amplifier (2), and main control display (13) at the wellhead position, and install and fix the transmitting transducer (3) and receiving transducer (10) on both sides of the well fluid surface; Step 3: The acoustic signal transmitter (1) transmits an acoustic signal downhole through the power amplifier (2) and the transmitting transducer (3). The frequency of the signal is... The sound pressure value of the signal The PTP clock (4) records the current time as follows: The time when the PTP clock (8) receives the signal is Then the signal propagation time And divide the signal propagation time according to the signal frequency into The temperature value measured by the temperature sensor (6) is [missing information]. The pressure value measured by the pressure sensor (7) is ; If the reciprocal transducer (5) does not receive the sound signal emitted by the transmitting transducer (3), it sends a prompt message to the main control display (13), and the power amplifier (2) will automatically adjust the power level; if the receiving transducer (10) does not receive the sound signal emitted by the reciprocal transducer (5), it will also send a prompt message to the main control display (13), and then remotely adjust the sound pressure value of the sound signal emitted by the reciprocal transducer (5). Step 4: The first in the oil and gas well (14) Liquid density of the segment With the corresponding temperature and pressure The relational expression is: ， In the formula, It is the density of light crude oil under standard conditions, which is , The coefficient of thermal expansion of light crude oil is . Reference temperature for , It is the pressure coefficient of light crude oil; The first in oil and gas well (14) bulk modulus of segment With the corresponding temperature and pressure The relational expression is: ， In the formula, It is the bulk modulus of light crude oil under standard temperature and pressure. It is the temperature coefficient of light crude oil; The first in oil and gas well (14) speed of sound Density and bulk modulus The relational expression is: ， The conclusion is and each period of time Multiplying and summing, the relationship between the position information of the reciprocal transducer (5) and the velocity and time of each segment is expressed as follows: ， Finally, the position information of the reciprocal transducer (5) is obtained. The position of the reciprocal transducer (5) after demodulation by the receiving transducer (10) is displayed on the main control display (13). The temperature down in the well and pressure and time The location information of the reciprocal transducer (5) in the well is visualized and highlighted.

2. The high-precision time-synchronized multi-parameter downhole acoustic positioning method according to claim 1, characterized in that: The signal generated by the acoustic signal transmitter (1) is a pulse signal, and the frequency range is determined according to the waveguide channel characteristics in the pipe.

3. The high-precision time-synchronized multi-parameter downhole acoustic positioning method according to claim 1, characterized in that: The power amplifier (2) amplifies the acoustic signal linearly and adjusts the power level.

4. The high-precision time-synchronized multi-parameter downhole acoustic positioning method according to claim 1, characterized in that: The sampling frequency of the reciprocal transducer (5) and the receiving transducer (10) is the product of the acoustic signal frequency and the sampling time, and the acoustic communication between the reciprocal transducer (5) and the receiving transducer (10) is always matched.

5. The high-precision time-synchronized multi-parameter downhole acoustic positioning method according to claim 1, characterized in that: The main control display (13) can visualize the downhole measurement information demodulated by the receiving transducer (10); and remotely control the transmission and stopping of the transmitting transducer (3); Receive and display the positioning success or failure prompts sent by the reciprocal transducer (5) and the receiving transducer (10); highlight the positioning information of the reciprocal transducer (5) in the well; and remotely adjust the sound pressure value of the signal emitted by the reciprocal transducer (5).

Images