Underground multi-parameter wireless monitoring and direct reading system for oil field

Abstract

The invention discloses an underground multi-parameter wireless monitoring and direct reading system for an oil field. The underground multi-parameter wireless monitoring and direct reading system comprises an underground monitoring unit, a wireless transmission unit, a ground receiving unit, a power management unit and a data storage unit, the underground monitoring unit is used for collecting various underground parameters of an oil well; the wireless transmission unit is used for transmitting data acquired by the underground monitoring unit to a ground receiving device in a wireless mode; the ground receiving unit is used for receiving and processing data transmitted from the underground and storing the data in the data storage unit; the data storage unit is used for recording underground historical monitoring data so as to facilitate subsequent analysis and optimization of oil well production; and the power management unit is used for providing power support for the underground monitoring unit and the wireless transmission unit to ensure long-term stable underground operation of the system.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield exploitation, and in particular to a multi-parameter wireless monitoring direct reading system used in oilfield wells. Background Art

[0002] During oilfield exploitation, downhole parameters such as pressure, temperature, and flow are crucial to the production efficiency and safety of the oil wells. Real-time and accurate monitoring of these parameters can help operators promptly judge well conditions, control production, and prevent safety accidents.

[0003] Traditional oilfield downhole monitoring equipment relies on wired transmission, but the wired system is complex to install, requiring the laying of a large number of cables, and the well needs to be shut down for maintenance, resulting in high costs. In addition, the wired monitoring system is susceptible to physical damage in harsh environments such as high temperature and high pressure, which affects the stability of signal transmission and even causes monitoring interruption.

[0004] Wireless monitoring technology has been gradually applied to oilfield development in recent years, but the existing wireless systems still have limitations in multi-parameter acquisition and real-time performance, especially in high-temperature and high-pressure oilfield environments. The system stability and data accuracy need to be further improved. Summary of the invention

[0005] In order to solve the problems raised in the above background technology, the technical solution adopted by the present invention is: An oilfield downhole multi-parameter wireless monitoring direct reading system, comprising a downhole monitoring unit, a wireless transmission unit, a ground receiving unit, a power management unit and a data storage unit; The downhole monitoring unit is used to collect various parameters downhole in the oil well; The wireless transmission unit is used to transmit the data collected by the downhole monitoring unit to the ground receiving device by wireless means; The surface receiving unit is used to receive and process the data transmitted from the downhole, and store the data in the data storage unit; The data storage unit is used to record historical monitoring data downhole, so as to facilitate subsequent analysis and optimization of oil well production; The power management unit is used to provide power support for the underground monitoring unit and the wireless transmission unit to ensure long-term stable operation of the system underground.

[0006] In some embodiments, the wireless transmission unit uses a radio frequency circuit to convert the data collected by the downhole monitoring unit into a wireless radio frequency signal, and then transmits the data to a ground receiving unit.

[0007] In some embodiments, the wireless transmission unit further includes an oscillator, which is used to generate a reference signal that is phase-synchronized with the received signal, and to compensate the output wireless RF signal using the following formula:

[0008]

[0009] in, , They represent the I-channel signal and Q-channel signal before compensation respectively. , Respectively represent the compensated I-channel signal and Q-channel signal, , They represent the reference signals output by the oscillator in I and Q paths respectively. , Represent the carrier frequency and time respectively, , , They represent the phase offset of the I signal, Q signal and carrier signal respectively.

[0010] In some embodiments, the downhole monitoring unit is installed in the downhole position of the oil well, and includes multiple sensors for collecting parameters including oil temperature, oil pressure, flow rate and water content. In addition, each sensor can be configured with functions such as timed collection, automatic wake-up, manual wake-up, on-site display, and on-site parameter setting.

[0011] In some embodiments, the downhole monitoring unit also includes an analog-to-digital conversion module and a signal processing module. The analog-to-digital conversion module is used to convert analog signals collected by multiple sensors into digital signals. After being processed by the signal processing module, the digital signals serve as input signals of the wireless transmission unit.

[0012] In some embodiments, the signal processing module uses an adaptive filtering algorithm to filter the digital signal.

[0013] In some embodiments, the ground receiving unit includes an antenna, a signal decoding module and a display screen. After the antenna receives the downhole data, it is processed by the signal decoding module and displayed in real time on the display screen, and the data is stored in a data storage unit for subsequent analysis.

[0014] In some embodiments, the ground receiving unit further includes an alarm module for automatically triggering an alarm after the received downhole data reaches a preset threshold, and simultaneously sending the alarm information to the remote monitoring terminal.

[0015] Compared with the prior art, the oil field downhole multi-parameter wireless monitoring direct reading system provided by the present invention solves the problems of complex wired transmission installation and untimely data acquisition in the prior art, realizes real-time monitoring and wireless data transmission of oil well downhole parameters, and performs direct reading through ground equipment, thereby improving the monitoring efficiency of oil well operation; by transmitting data wirelessly, the complex installation problems of traditional wired systems are avoided, and the equipment maintenance cost is reduced; the wireless radio frequency signal is compensated, thereby improving the accuracy of parameter monitoring; and the system can operate stably for a long time in harsh environments, ensuring the continuity of the monitoring effect, which is conducive to ensuring the safe operation of oil field downhole. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention provides a schematic diagram of an oil field underground multi-parameter wireless monitoring direct reading system. DETAILED DESCRIPTION

[0017] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the following further describes how the present invention is implemented in conjunction with the accompanying drawings and specific implementation methods.

[0018] Reference Figure 1 As shown, the present invention provides an oilfield downhole multi-parameter wireless monitoring direct reading system, including an oilfield downhole multi-parameter wireless monitoring direct reading system, including a downhole monitoring unit 1, a wireless transmission unit 2, a ground receiving unit 3, a power management unit 4 and a data storage unit 5; the downhole monitoring unit 1 is used to collect multiple parameters of the oil well; the wireless transmission unit 2 is used to transmit the data collected by the downhole monitoring unit 1 to the ground receiving device by wireless means; the ground receiving unit 3 is used to receive and process the data transmitted from the downhole, and store the data in the data storage unit 5; the data storage unit 5 is used to record the historical monitoring data of the downhole, which is convenient for subsequent analysis and optimization of oil well production; the power management unit 4 is used to provide power support for the downhole monitoring unit 1 and the wireless transmission unit 2, so as to ensure the long-term stable operation of the system in the downhole.

[0019] In a specific embodiment, the wireless transmission unit 2 uses a radio frequency circuit to convert the data collected by the downhole monitoring unit 1 into a wireless radio frequency signal, and then transmits the data to the ground receiving unit 3.

[0020] Furthermore, the wireless transmission unit 2 further includes an oscillator, which is used to generate a reference signal that is phase-synchronized with the received signal, and to compensate the output wireless radio frequency signal by the following formula:

[0021]

[0022] in, , They represent the I-channel signal and Q-channel signal before compensation respectively. , Respectively represent the compensated I-channel signal and Q-channel signal, , They represent the reference signals output by the oscillator in I and Q paths respectively. , Represent the carrier frequency and time respectively, , , They represent the phase shift of the I signal, Q signal and carrier signal respectively. Through such compensation method, the in-phase noise is effectively suppressed to facilitate correct demodulation and improve the accuracy of parameter monitoring.

[0023] In this embodiment, the downhole monitoring unit 1 is installed in the downhole position of the oil well, and includes multiple sensors for collecting parameters including oil temperature, oil pressure, flow rate and water content. The housing of each sensor should adopt a waterproof and anti-corrosion structure to make it suitable for the extreme environment of the oil field downhole.

[0024] In addition, the downhole monitoring unit 1 also includes an analog-to-digital conversion module and a signal processing module. The analog-to-digital conversion module is used to convert analog signals collected by multiple sensors into digital signals. After being processed by the signal processing module, the digital signals serve as input signals of the wireless transmission unit 2.

[0025] In this embodiment, the signal processing module uses an adaptive filtering algorithm to filter the digital signal. Specifically: First, the digital signal is converted from the time domain to the frequency domain through the fast Fourier transform (FFT) to identify and separate different frequency components. The environmental noise in the oil field well is usually manifested as low-frequency and high-frequency interference. Frequency domain analysis can effectively locate and eliminate these interference signals. Then, dynamic adjustment is achieved through the adaptive filter. The adaptive filter adaptively adjusts its bandwidth according to different noise types and intensities, and filters out signal noise in the non-target frequency range to adapt to the downhole noise characteristics. For example, when the low-frequency signal noise increases, the system will automatically narrow the low-frequency band of the filter. In addition, according to the time-varying characteristics of the noise, the gain and cutoff frequency of the filter are adjusted in real time to keep the filtering effect consistent with the downhole environment.

[0026] Since oilfield downhole monitoring needs to deal with complex environmental noise and data fluctuations, this embodiment is based on an adaptive filtering algorithm to decompose the data collected by the sensor into signal components of different frequencies, automatically suppress interference signals, and ensure that the parameter data obtained by the system is more real and stable.

[0027] In this embodiment, the ground receiving unit 3 includes an antenna, a signal decoding module and a display screen. After the antenna receives the downhole data, it is processed by the signal decoding module and displayed in real time on the display screen, and the data is stored in the data storage unit 5 for subsequent analysis.

[0028] In this embodiment, the ground receiving unit 3 also includes an alarm module, which is used to automatically trigger an alarm after the received downhole data reaches a preset threshold, and send the alarm information to the remote monitoring terminal at the same time.

[0029] In addition, the power management unit 4 can use high-efficiency batteries and can dynamically adjust energy consumption according to the operating status; according to specific implementation needs, it can also be combined with external power supply or energy collection methods to provide power support for the system to ensure long-term operation of the equipment in harsh underground environments.

[0030] In summary, it can be seen that compared with the prior art, the oil field downhole multi-parameter wireless monitoring direct reading system provided by the present invention solves the problems of complex wired transmission installation and untimely data acquisition in the prior art, realizes real-time monitoring and wireless data transmission of oil well downhole parameters, and directly reads through ground equipment, thereby improving the monitoring efficiency of oil well operation; by transmitting data wirelessly, the complex installation problems of traditional wired systems are avoided, and the equipment maintenance cost is reduced; the wireless radio frequency signal is also compensated, thereby improving the accuracy of parameter monitoring; and the system can operate stably for a long time in harsh environments, ensuring the continuity of the monitoring effect, which is conducive to ensuring the safe operation of oil field downhole.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An oilfield downhole multi-parameter wireless monitoring direct reading system, characterized in that: It comprises a downhole monitoring unit (1), a wireless transmission unit (2), a ground receiving unit (3), a power management unit (4) and a data storage unit (5); The downhole monitoring unit (1) is used to collect various parameters downhole in the oil well; The wireless transmission unit (2) is used to transmit the data collected by the downhole monitoring unit (1) to a surface receiving device in a wireless manner; The surface receiving unit (3) is used to receive and process data transmitted from the underground well, and store the data in the data storage unit (5); The data storage unit (5) is used to record historical monitoring data downhole, so as to facilitate subsequent analysis and optimization of oil well production; The power management unit (4) is used to provide power support for the underground monitoring unit (1) and the wireless transmission unit (2), thereby ensuring long-term stable operation of the system underground.

2. The oilfield downhole multi-parameter wireless monitoring direct reading system according to claim 1 is characterized in that: The wireless transmission unit (2) uses a radio frequency circuit to convert the data collected by the downhole monitoring unit (1) into a wireless radio frequency signal, and then transmits the data to a ground receiving unit (3).

3. The oilfield downhole multi-parameter wireless monitoring direct reading system according to claim 2 is characterized in that: The wireless transmission unit (2) further comprises an oscillator, which is used to generate a reference signal that is phase-synchronized with the received signal and to compensate the output wireless radio frequency signal using the following formula: in, , They represent the I-channel signal and Q-channel signal before compensation respectively. , Respectively represent the compensated I-channel signal and Q-channel signal, , They represent the reference signals output by the oscillator in I and Q paths respectively. , Represent the carrier frequency and time respectively, , , They represent the phase offset of the I signal, Q signal and carrier signal respectively.

4. The oilfield downhole multi-parameter wireless monitoring direct reading system according to claim 1 is characterized in that: The downhole monitoring unit (1) is installed at a downhole location of the oil well and comprises a plurality of sensors for collecting parameters including oil temperature, oil pressure, flow rate and water content.

5. The oilfield downhole multi-parameter wireless monitoring direct reading system according to claim 4 is characterized in that: The downhole monitoring unit (1) further comprises an analog-to-digital conversion module and a signal processing module. The analog-to-digital conversion module is used to convert analog signals collected by multiple sensors into digital signals. After being processed by the signal processing module, the digital signals serve as input signals for the wireless transmission unit (2).

6. The oilfield downhole multi-parameter wireless monitoring direct reading system according to claim 5 is characterized in that: The signal processing module uses an adaptive filtering algorithm to perform filtering on the digital signal.

7. The oilfield downhole multi-parameter wireless monitoring direct reading system according to claim 1 is characterized in that: The ground receiving unit (3) comprises an antenna, a signal decoding module and a display screen. After the antenna receives the downhole data, the downhole data is processed by the signal decoding module and displayed in real time on the display screen. The data is stored in a data storage unit (5) for subsequent analysis.

8. The oilfield downhole multi-parameter wireless monitoring direct reading system according to claim 7 is characterized in that: The ground receiving unit (3) also includes an alarm module, which is used to automatically trigger an alarm after the received downhole data reaches a preset threshold, and simultaneously send the alarm information to the remote monitoring terminal.

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