WO2023245943A1 - Shaft multiphysics measurer - Google Patents

Abstract

A shaft multiphysics measurer, comprising a housing (1) provided with an inner cavity and a circuit board assembly (2) mounted in the inner cavity. The circuit board assembly (2) is integrally provided with at least two sensing modules used for measuring different physical parameters and comprises a plurality of rigid circuit boards (21) arranged in the extending direction of the inner cavity and flexible circuit boards (22) electrically connected between the different rigid circuit boards (21). According to the shaft multiphysics measurer, at least two different physical parameters in a shaft can be measured by means of the sensing modules integrally provided on the circuit board assembly (2), and the size of the circuit board assembly (2) is effectively reduced by using the characteristic that the flexible circuit boards (22) are easy to bend, such that a circuit is miniaturized, and a measuring tool is more compact in structure and smaller in size.

Description

Wellbore Multiphysics Surveyor

Cross-references to related applications

This application claims the rights and interests of Chinese patent application 202210698537.4 submitted on June 20, 2022. The content of this application is incorporated into this article by reference.

Technical field

The present invention relates to wellbore detection tools, and in particular to a wellbore multi-physics field measurer.

Background technique

With the continuous deepening of oil and gas exploration and development, drilling projects are gradually moving into deep wells, ultra-deep wells and other fields. As a result, they are faced with harsh environmental conditions such as ultra-high temperature (220°C), ultra-high pressure (200MPa), strong vibration, corrosion, etc. At the same time, geological conditions are also changing. As drilling and completion processes become more complex, risk management becomes more important. The complex underground environment, especially the narrow safety density window and other problems, leads to frequent problems such as lost circulation, well kicks, channel channeling during drilling and completion, destroying the integrity of the wellbore, and may even lead to the scrapping of oil and gas wells.

For example, temperature and pressure have a very significant impact on the performance parameters of drilling fluids and cementing fluids, and there are also obvious differences in the response patterns of wellbore fluid thermophysical parameters in different temperature and pressure ranges. In deep wells and ultra-deep wells, the wellbore temperature and pressure are higher, The changes are larger. At present, the influence of ultra-high temperature and ultra-high pressure (220°C, 200MPa) on the density and rheology of wellbore fluid is still unclear. The rheological model of wellbore fluid under the coupled effects of ultra-high temperature and ultra-high pressure is still lacking, and the motion state of wellbore fluid cannot be accurate. It is impossible to know how the fluid motion state will change when complex working conditions such as overflow and leakage occur. In addition, the research on the weight loss characteristics of cement slurry under high temperature and high pressure conditions is insufficient, and it cannot provide guidance for cementing operations in deep wells and ultra-deep wells under ultra-high temperature and ultra-high pressure environments.

Therefore, obtaining accurate temperature field, pressure field distribution and wellbore fluid dynamic properties and other parameters in the wellbore are of great significance for the calculation, judgment and control of downhole fluid properties and construction process risks during drilling and completion.

At present, measurement while drilling technology has achieved significant development, forming a series of mature products and achieving remarkable application results. However, under ultra-high temperature and ultra-high pressure conditions, these measurement while drilling tools have insufficient temperature tolerance and are prone to failure. Defect, and it is measured at a single point underground and has a single dimension. Real-time acquisition of downhole engineering parameters through measurement-while-drilling tools is the most effective way to accurately grasp wellbore information. Conventional measurement-while-drilling tools are usually placed near the drill bit to continuously measure bottom-hole engineering parameters in a certain well section. As a result, they cannot be used while drilling. It is fully applied in the whole process of well completion. Limited by the single-point measurement characteristics of MWD tools, they can only obtain engineering parameters of a certain well depth and have a single dimension, making it impossible to achieve real-time measurement of wellbore pressure profiles in long open-hole sections of deep wells. Most MWD tools are relatively expensive, and once downhole The occurrence of complex accidents may lead to equipment scrapping and increase the economic cost of drilling.

Currently, existing products in relevant markets mainly include drilling microchip measurement tools developed by Saudi Aramco, downhole microchip smart capsules developed by Zhejiang Tanxin Technology Co., Ltd., microchip tracers developed by Sinopec Engineering Institute, Ningbo Wanyu Deep Sea Energy Technology Co., Ltd. developed a microchip sensor for downhole measurement. However, these products have shortcomings in terms of product volume, types of measurement parameters, and pressure measurement solutions.

Contents of the invention

The purpose of the present invention is to overcome the problems of single measurement dimension and large product volume of wellbore detection tools existing in the prior art, and to provide a wellbore multi-physics field measurer that can collaboratively measure at least two objects in the wellbore. It has different physical parameters and has the advantages of compact structure and small size.

In order to achieve the above object, one aspect of the present invention provides a wellbore multi-physics field measurer, which includes a housing with an inner cavity and a circuit board assembly installed in the inner cavity. The circuit board assembly is integrated with at least two types of components for The sensing module measures different physical parameters and includes a plurality of rigid circuit boards arranged along the extension direction of the inner cavity and a flexible circuit board electrically connected between the different rigid circuit boards.

Preferably, the outer peripheral contour of each rigid circuit board is formed into a circle with a diameter of no more than 15 mm, and/or the flexible circuit board is connected to the outer peripheral edge of the rigid circuit board.

Preferably, the sensing module includes a pressure sensing module, and the inner cavity of the housing is filled with a PDMS composite conductive material electrically connected to the pressure sensing module, so that the ambient pressure can be measured through the PDMS composite conductive material. .

Preferably, the PDMS composite conductive material serves as a pressure sensor and forms a Wheatstone bridge circuit with the pressure sensing module.

Preferably, the PDMS composite conductive material is filled to fix the circuit board assembly in the inner cavity of the housing.

Preferably, the housing is made of carbon fiber reinforced polyetheretherketone material, and/or a spiral flow channel is formed on the outer peripheral surface of the housing.

Preferably, the circuit board assembly is integrated with a main control chip, a low-frequency crystal oscillator that is signal-connected to the main control chip and serves as a clock source, and a data processing element that time-stamps the measured data based on the low-frequency crystal oscillator. .

Preferably, a button battery electrically connected to the circuit board assembly is also provided in the inner cavity of the housing, and/or the circuit board assembly is reserved with a SWD debugging interface and/or a serial data transmission interface.

Preferably, the sensing module includes at least one of a temperature sensor, a magnetometer, and a gyroscope accelerometer, and/or a Bluetooth module is integrated on the circuit board assembly.

Preferably, the circuit board assembly is configured to be switchable between an active state and a standby state.

Through the above technical solution, the wellbore multi-physics field measurer of the present invention can measure at least two different physical parameters in the wellbore by integrating the sensing module provided on the circuit board assembly, and is also effective by utilizing the easy bending characteristics of the flexible circuit board. The size of the circuit board assembly is reduced, miniaturizing the circuit, making the measurement tool more compact and smaller.

Description of the drawings

Figure 1 is a schematic diagram of the overall architecture of a wellbore multi-physics field measurer according to a preferred embodiment of the present invention;

Figure 2 is a schematic structural diagram of the circuit board assembly of the wellbore multi-physics field measurer in Figure 1;

Figure 3 is a circuit diagram of the pressure sensing module of the wellbore multi-physics field measurer in Figure 1;

Figure 4 is a schematic diagram of the pressure measurement principle and effect of the PDMS composite conductive material used in the wellbore multi-physics field measurer in Figure 1;

Figure 5 is a schematic diagram of the packaging process of the wellbore multi-physics field measurer of the present invention;

FIG. 6 is an outline view of the housing of the wellbore multiphysics field measurer in FIG. 1 .

Detailed ways

Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

Referring to Figures 1 and 2, a wellbore multi-physics field measurer according to a preferred embodiment of the present invention includes a housing 1 with an inner cavity and a circuit board assembly 2 installed in the housing 1. The circuit board The component 2 is integrated with at least two sensing modules for measuring different physical parameters (such as temperature, pressure, dynamics, geomagnetic field), and includes a plurality of rigid circuit boards 21 electrically connected by flexible circuit boards 22 . The housing 1 may have a generally cylindrical outer contour and an inner cavity, and a plurality of rigid circuit boards 21 are arranged in the inner cavity along the extending direction of the inner cavity.

Therefore, the wellbore multi-physics field measurer of the present invention can measure at least two different physical parameters in the wellbore by integrating the sensing module provided on the circuit board assembly 2, and is also effective by utilizing the easy bending characteristics of the flexible circuit board 22. The size of the circuit board assembly 2 is reduced, miniaturizing the circuit and making the measuring tool more compact and smaller in size. Compared with the single circuit board design used in micro circuits by existing similar microchip tools, the micro core system designed in the present invention adopts a combination of soft and hard circuit boards. The circuit board assembly 2 can be composed of three circles. It consists of a shaped rigid circuit board (such as a diameter of 10mm) and two flexible circuit boards. MEMS sensors and auxiliary electronic components with different functions can be arranged on the rigid circuit boards respectively. Different rigid circuit boards are connected through flexible circuit boards. , which not only enables the microchip tool to achieve collaborative measurement of multiple physical fields (temperature, pressure, magnetism, motion), but also uses the easy bending characteristics of the flexible circuit board to effectively reduce the size of the microcircuit, enabling the entire microchip to be measured Tools become more compact. Due to the need for multi-physical field measurement, the microchip tool carries a large number of sensors, and each sensor must be equipped with an auxiliary circuit, making the arrangement of the entire integrated circuit board extremely complicated. Through the above settings of the present invention, it is possible to Conveniently arrange a complete set of multi-physics (temperature, pressure, magnetism, motion) collaborative measurement circuit on the circuit board assembly to achieve multi-physics measurement. The coordinated use of various parts in the circuit board assembly can improve the accuracy of parameter measurement and improve the stability and anti-interference of data transmission. The filtering part in the circuit can filter out high and low frequency noise during signal transmission and improve signal quality. The electrostatic protection components in the circuit can effectively prevent the chip from being accidentally damaged.

As mentioned above, the housing 1 may be formed with an inner cavity having a certain extended length, and the inner cavity may be formed to have a circular or other shaped cross-section (such as a square). In order to make full use of the space within the housing 1, the outer contour of each rigid circuit board 21 in the circuit board assembly 2 can be formed into a circle with a diameter of no more than 15 mm (eg, 10 mm). In addition, in order to facilitate circuit connection, the flexible circuit board 22 may be connected to the outer peripheral edge of the rigid circuit board 21 .

In the wellbore operating environment, especially in ultra-deep well drilling conditions, the pressure parameter is one of the important parameters that need to be measured and monitored. Due to the high pressure, it is difficult for ordinary measurement tools to accurately and reliably measure the pressure in the wellbore. Among them, Pressure sensors are often more complex in design. To this end, in a preferred embodiment of the present invention, the circuit board assembly 2 can be integrated with a pressure sensing module, and the inner cavity of the housing 1 is filled with a PDMS composite electrically connected to the pressure sensing module. The conductive material 3 is shown in Figures 3 to 5, so that the environmental pressure can be measured through the PDMS composite conductive material 3. In view of the shortcomings of pressure sensors in existing similar microchip tools such as complex structures and poor sensitivity, the wellbore multi-physical field measurer of the present invention can use highly conductive porous PDMS (polydimethylsiloxane) material as the pressure sensing medium. By designing the concentration, distribution and pore structure of the conductive substance during material preparation, the electrical properties of the material can provide linear feedback to large pressure changes. The material is filled inside the shell 1 and placed therein. Connected to the pressure sensing module in the circuit board assembly 2, it can realize sensitive sensing of ultra-high pressure in ultra-high temperature environment, thereby achieving accurate measurement of ultra-high pressure. The highly conductive porous PDMS pressure sensing material maintains a constant pore structure in the initial state without external pressure, and the sensing layer is in a high resistance state and low current value; when the external pressure increases, the pore structure is compressed, increasing the conduction state of the internal circuit, and sensing The layer exhibits a low resistance state and a high current value, thereby enabling sensing of external pressure. As shown in Figures 3 and 4, a foaming method is used to prepare highly conductive porous PDMS material as a pressure sensing medium. By designing the concentration, distribution and pore structure of the conductor, the electrical properties of the material are suitable for large-scale applications. The range of pressure changes presents linear feedback, thereby achieving sensitive awareness of ultra-high pressure environments. The changes in the electrical properties of the highly conductive porous PDMS material pressure sensing medium are introduced into the Wheatstone bridge of the circuit board assembly. After being amplified by the signal amplifier, it can be transferred to the ADC acquisition channel of the microprocessor for signal acquisition, and this The data is stored in the microprocessor's built-in Flash.

Figure 5 shows the packaging process of the wellbore multi-physics field measurer of the present invention. The circuit board components 2 can first be arranged in the inner cavity of the housing 1, and then the PDMS composite conductive material 3 can be poured into the inner cavity, so that The circuit board assembly 2 and the like are fixed in the inner cavity of the housing 1 by the PDMS composite conductive material 3, and then the housing material is poured into the opening of the housing 1 to form an outer protective film.

In addition to the above pressure sensing module, the sensing module may also include at least one of a temperature sensor, a magnetometer, and a gyroscope accelerometer.

In the above-mentioned wellbore multi-physics field measurer, the housing 1 can be made of a temperature-resistant and pressure-resistant polymer material. In a preferred embodiment of the present invention, the housing 1 may be made of carbon fiber reinforced polyetheretherketone (PEEK) material. The polymer shell has the outstanding characteristics of high temperature resistance, corrosion resistance and good mechanical properties. It can better protect the core system and enable the microchip tool to adapt to the complex underground environment. The housing 1 can be reserved with an activation interface and a data transmission interface.

Figure 6 shows the housing 1 of a wellbore multiphysics field measurer according to a preferred embodiment of the present invention, in which a spiral flow channel 11 is formed on the peripheral surface of the housing 1, thereby improving the microchip tool To ensure posture stability and movement efficiency in the wellbore, these spiral flow channels 11 are used to guide the flow of drilling fluid around the microchip tool. Through fluid-structure coupling simulation analysis and experimental testing, the spiral flow channel 11 can improve the hydrodynamic performance of the microchip tool in the fluid.

Furthermore, the present invention can integrate a Bluetooth module on the circuit board assembly 2. Therefore, compared with existing microchip tools of the same type that cannot simply and quickly perform integrity testing of the measurement function before entering the well, the present invention can Before going down the well, the measurement performance of the microchip tool is quickly tested and the test results are transmitted back to the host computer via Bluetooth.

In order to realize the measurement and storage of various physical parameters, etc., the circuit board assembly 2 can be provided with various functional components. For example, a low-frequency crystal can be integrated with a main control chip, a signal connected to the main control chip and used as a clock source. An oscillator and a data processing element that time-stamps measured data based on the low-frequency crystal oscillator.

As shown in Figure 1, a button battery 4 electrically connected to the circuit board assembly 2 can also be disposed in the inner cavity of the housing 1, thereby providing stable power to the entire microchip tool through the power interface in the core circuit.

In order to facilitate debugging, testing, data transmission and pre-well inspection of the chip tool, the circuit board assembly 2 may also reserve an SWD debugging interface and/or a serial data transmission interface.

Circuit board component 2 is set to be able to switch between the active state and the standby state. Before being activated, the chip will always be in an ultra-low power shutdown mode. After all measurements are completed, the chip tool will enter the low power mode again. Since the shutdown mode is the lowest power consumption mode of the chip, it can significantly reduce the energy consumption of the power supply battery, thereby extending the measurement time of the micro temperature measurement chip tool.

The above-mentioned wellbore multi-physics field measurer provided by the present invention can be used in the fields of oil, natural gas drilling and completion, natural gas hydrate drilling and production, etc., to measure the full-bore multi-physics field (temperature , pressure, dynamic, magnetic) to conduct collaborative measurements to help field engineers understand the underground situation in a timely manner, provide early warning of overflow, loss and other complex problems, and provide support for timely adjustment of wellbore pressure or downhole fluid performance. This wellbore multi-physics field measurer can achieve fast, continuous, low-cost multi-physics collaborative measurement during the drilling process, and plays a crucial role in the successful development of microchip tools. Through the use of the above different technical means, the present invention has certain advantages in terms of energy consumption control, storage capacity, circuit stability, etc. compared with existing products. Compared with existing similar products, the present invention adopts a split-board circuit that combines software and hardware, increases the type and quantity of components while ensuring size, and realizes collaborative measurement of multiple physical fields; the present invention is designed to carry a core system The low-power information transmission control module can quickly detect the measurement function of the tool and notify the results in real time. At the same time, it can freely set and quickly switch the chip activation and shutdown states, greatly reducing energy consumption and extending the measurement time; the design of the present invention A pressure sensing housing based on highly conductive porous PDMS material is developed to achieve accurate measurement of ultra-high pressure.

The following is an exemplary description of the wellbore multi-physics field measurer and its working principles and advantages according to a preferred embodiment of the present invention:

The main control chip in the circuit board assembly uses an ultra-low power microprocessor based on

It also has an FPU core, which has powerful computing and processing performance while maintaining the smallest possible dynamic power consumption. It also has running mode, low-power running mode, sleep mode, low-power sleep mode, stop mode, standby mode and shutdown. Modes Seven main low-power modes. Thanks to its built-in internal voltage regulator and voltage scaling, the microprocessor is able to maintain the lowest possible energy consumption while maintaining performance even if the external supply voltage changes significantly.

As the core control center and data processing center of microchip tools, the microprocessor can receive, store, analyze, transmit and convert analog-to-digital data. It has a built-in 1MB Flash storage unit that can be used to receive temperature and pressure measured by the sensor. , dynamics (acceleration, angular velocity) and geomagnetic field data, and time tags all received data, then saves the data to its built-in Flash, and transmits all collected data to the host computer after establishing a connection with the host computer machine for analysis and processing.

The temperature sensor used in the temperature measurement circuit in the core circuit is a low-power, high-precision digital temperature sensor, which communicates and transmits data with the microprocessor through the I2C bus. The sensor can measure ultra-high temperatures up to 220°C and provide 16-bit temperature results with a resolution of 0.0078°C and an accuracy of up to ±0.1°C. It also has the remarkable features of small package size and low power consumption. With a 5KΩ pull-up chip resistor in the temperature measurement circuit, the uncertain signal can be clamped at a high level through a resistor, and at the same time it can limit the current to prevent excessive current from burning the temperature sensor.

The motion sensor used in the dynamics signal measurement circuit in the core circuit is a high-precision six-axis gyroscope accelerometer sensor, which uses an external precise RTC reference clock to eliminate timing errors and embeds a high-resolution analog-to-digital converter. The resolution of MEMS gyroscopes and MEMS accelerometers can be greatly improved, and data accuracy can be further improved through internal programmable digital filters. The gyroscope accelerometer sensor and the microprocessor carry out control command sending and receiving and rapid data transmission through the I2C bus.

The magnetometer used in the geomagnetic signal measurement circuit in the core circuit is a three-axis digital magnetic sensor, which has a wide dynamic measurement range, high-speed data output rate, ultra-low hysteresis characteristics, ultra-low sensitivity temperature drift and ultra-low temperature drift characteristics, and can further improve data accuracy through built-in tilt compensation, horizontal axis compensation and noise suppression algorithms. The magnetic sensor communicates and transmits data with the microprocessor through the I2C bus.

The circuit board assembly is equipped with a low-power Bluetooth module, which can conduct wireless data transmission with the host computer. Bluetooth can also be used to check the integrity of the microchip tool's measurement function before entering the well, ensuring that the chip tool's measurement function is normal and there is sufficient power. power.

The power supply in the core circuit is a silver oxide high-temperature resistant micro button battery. The button battery has a diameter of 9.5mm, a thickness of 2.7mm, and a battery capacity of 53mAh. It not only has a small overall size but also a relatively large battery capacity. At the same time, during the discharge process, the curve of voltage versus discharge time is very flat and can maintain a relatively stable power supply voltage, allowing each sensor measurement module in the core system to maintain stable and efficient measurement performance.

The power supply circuit in the core circuit is equipped with an ESD electrostatic protection device, which can provide voltage stabilization and electrostatic protection. At the same time, the circuit is also equipped with a filter circuit, which is mainly composed of filter capacitors with different capacitances. It can not only make the DC output of the power supply smooth and stable, filter out high and low-frequency noise signals in the circuit, but also play a decoupling role to meet the driver requirements. Changes in circuit current avoid mutual coupling interference and make the working performance of electronic circuits more stable.

The communication between the microprocessor in the core circuit and the MEMS sensor uses the I2C bus, which only requires one data line and one clock line, and the bus interface has been integrated inside the chip, so no special interface circuit is required. . Using the I2C bus can simplify the PCB wiring of microcircuits in the core system, reduce system costs, and improve system reliability. An external pull-up resistor is connected to the bus, which can limit the current value in the I2C bus while improving the communication capability of the I2C bus, ensuring the stability and accuracy of data transmission.

The microprocessor auxiliary circuit in the core circuit is equipped with a low-frequency crystal oscillator, which is used as an external low-speed clock source. The main control chip uses it to accurately time and time-stamp the measurement data. The crystal oscillator uses a passive crystal oscillator with a crystal oscillator frequency of 32.768kHz. Together with a crystal oscillator load capacitor with a capacitance value of 6pF, it can better ensure the stability of the output oscillation frequency of the external crystal oscillator (32.768kHz) of the main control chip.

From the perspective of high-temperature resistance, high-pressure resistance, and controllable density classification of the external shell of the microchip tool, high-strength polyetheretherketone (PEEK) material is used for shell preparation. This material has excellent mechanical properties, high temperature resistance, high pressure resistance, and corrosion resistance. Its melting point is 343°C, softening point is 168°C, and tensile strength is 132MPa~148MPa. It has excellent corrosion resistance and is capable of operating in complex underground environments. In view of the extreme environment of ultra-deep wells with ultra-high temperature and ultra-pressure, the mechanical properties of the polymer material are further improved through carbon fiber composite. The shell is made of a layered combination of carbon fiber-reinforced PEEK material and porous PDMS material. This not only protects the precision electronic circuits in the core system, but also achieves graded control of the density of the shell to match different wellbore working fluids. Tie.

An external activation interface and a low-power data transmission interface are reserved on the casing. The microprocessor chip can quickly switch between operating mode and low-power mode. In order to save the power of the micro-button battery, the micro-chip tool is always in an ultra-low-power shutdown mode before entering the well, and is activated through the reserved button on the external housing. The interface can quickly wake it up into running mode, and the chip tool will enter low-power mode again after all measurements are completed. After the microchip tool is recovered from the wellbore, the measured data can be transmitted to the host computer for analysis and processing using the reserved low-power data transmission interface on the external housing. Strict power consumption control is implemented for every electronic component in the microchip tool core system, strict power consumption restrictions are imposed on each external reserved interface in the core circuit, and the embedded microprocessor is A low-power management mode is introduced in the program, which can significantly reduce the energy consumption of button batteries, thereby extending the service life of multi-physical field collaborative measurement microchip tools.

The preferred embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, including the combination of specific technical features in any suitable manner. In order to avoid unnecessary repetition, various possible combinations will not be further described in the present invention. However, these simple modifications and combinations should also be regarded as the disclosed content of the present invention, and all belong to the protection scope of the present invention.

Claims (10)

1. A wellbore multi-physics field measurer, characterized in that it includes a housing (1) with an inner cavity and a circuit board assembly (2) installed in the inner cavity. The circuit board assembly (2) is integrated with at least two A sensing module for measuring different physical parameters and includes a plurality of rigid circuit boards (21) arranged along the extension direction of the inner cavity and flexible circuits electrically connected between different rigid circuit boards (21) board (22), the flexible circuit board (22) is connected to the outer periphery of the rigid circuit board (21).
2. The wellbore multi-physics field measurer according to claim 1, characterized in that the outer peripheral contour of each rigid circuit board (21) is formed into a circle with a diameter of no more than 15 mm.
3. The wellbore multi-physics field measurer according to claim 1, wherein the sensing module includes a pressure sensing module, and the inner cavity of the housing (1) is filled with a liquid that is electrically connected to the pressure sensing module. The PDMS composite conductive material (3) of the module is capable of measuring environmental pressure through the PDMS composite conductive material (3).
4. The wellbore multi-physics field measurer according to claim 3, characterized in that the PDMS composite conductive material (3) serves as a pressure sensor and forms a Wheatstone bridge circuit with the pressure sensing module.
5. The wellbore multi-physics field measurer according to claim 3, characterized in that the PDMS composite conductive material (3) is filled to fix the circuit board assembly (2) in the inner cavity of the housing (1) middle.
6. The wellbore multi-physics field measurer according to claim 1, characterized in that the housing (1) is made of carbon fiber reinforced polyetheretherketone material, and/or the outer periphery of the housing (1) A spiral flow channel (11) is formed on the surface.
7. The wellbore multi-physics field measurer according to claim 1, characterized in that the circuit board assembly (2) is integrated with a main control chip, a low-frequency crystal oscillator that is signal-connected to the main control chip and serves as a clock source. and a data processing component that time-stamps the measured data based on the low-frequency crystal oscillator.
8. The wellbore multi-physics field measurer according to claim 1, characterized in that a button battery (4) electrically connected to the circuit board assembly (2) is also provided in the inner cavity of the housing (1), And/or, the circuit board assembly (2) is reserved with an SWD debugging interface and/or a serial data transmission interface.
9. The wellbore multi-physics field measurer according to claim 1, wherein the sensing module includes at least one of a temperature sensor, a magnetometer, and a gyroscope accelerometer, and/or the circuit board assembly ( 2) There is a Bluetooth module integrated on the top.
10. The wellbore multi-physics field measurer according to claim 1, characterized in that the circuit board assembly (2) is configured to be switchable between an active state and a standby state.

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