Multi-parameter integrated monitoring method and device for lubricating oil of fracturing equipment

Abstract

The invention discloses a multi-parameter integrated monitoring device for fracturing equipment lubricating oil, which comprises a power supply path, a communication link, an oil loop and an internal functional area, and is characterized in that the power supply path, the communication link and the oil loop respectively establish a system power supply path, an upper computer communication path and an oil detection path; an internal functional area signal acquisition functional block acquires seven parameter original signals of the lubricating oil of the fracturing equipment in real time by reading an oil sample in the same oil passage, and stores the seven parameter original signals in an internal storage; the oil quality analysis function block reads an original signal for real-time calculation, and oil quality qualitative and quantitative analysis results are obtained and stored in an internal storage as well; and finally, the system sends an internally stored original signal and an analysis result to an upper computer through a serial interface. According to the invention, high-precision, wide-range, small-size and integrated multi-parameter comprehensive measurement of multiple parameters of the lubricating oil of the fracturing equipment is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas well mining equipment, relates to a multi-parameter integrated monitoring method for lubricating oil of fracturing equipment, and also relates to a monitoring device used in the monitoring method. Background Art

[0002] With the rapid development of shale gas, the use of fracturing equipment for reservoir transformation is a decisive means to liberate oil and gas reservoirs. Real-time, comprehensive and accurate grasp of the operating status of fracturing equipment directly determines the quality and efficiency of mining. At present, the industry has initially established a comprehensive data acquisition system for key components such as fracturing pumps and reducers of fracturing equipment, which basically realizes the data acquisition and management of working condition sensor signals, vibration signals, video signals, etc., but the monitoring capabilities of auxiliary systems such as lubricating oil are insufficient, and it is difficult to meet the needs of refined equipment management. To this end, it is necessary to explore a lubricating oil monitoring device and method that meets multiple indicators, high precision, small size, and high flexibility, improve the informatization level of lubricating oil in fracturing equipment, provide a rich data basis for analyzing and exploring potential faults of fracturing equipment, and ensure the safe and efficient development of shale gas in my country.

[0003] The existing fracturing equipment lubricating oil monitoring system has basically achieved the monitoring of equipment lubrication status, wear particles, and various physical and chemical index data of oil products, but the monitoring dimensions are limited, mainly viscosity and density; secondly, basically each sensor can only monitor one parameter, and there is a problem of mechanical integrated stack hardware; at the same time, various sensors are arranged in a scattered manner, are large in size, and are difficult to install. A new monitoring device and method are urgently needed to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a multi-parameter integrated monitoring method for lubricating oil of fracturing equipment, which solves the problem that the existing monitoring system of lubricating oil of fracturing equipment has insufficient monitoring capability and is difficult to meet the demand for refined management of equipment.

[0005] A technical solution adopted by the present invention is a multi-parameter integrated monitoring device for lubricating oil of fracturing equipment, including a power supply path, a communication link, an oil circuit, and an internal functional area. The power supply path, the communication link, and the oil circuit respectively establish system power supply, communication, and oil circuits; the communication link is responsible for establishing communication with the upper-level information management system, and transmitting the collected parameters and oil quality analysis results to the upper-level information management system; the oil circuit is responsible for establishing a measurement oil circuit bypass, and the oil circuit is responsible for connecting the internal functional area through the internal oil circuit, and the internal functional area reads the oil sample in the oil circuit.

[0006] The present invention is also characterized in that:

[0007] The oil circuit includes a measuring oil circuit inlet, an oil inlet adapter, an oil outlet adapter and a measuring oil circuit outlet. Special low-pressure oil pipes are connected between the measuring oil circuit inlet and the oil inlet adapter, as well as between the oil outlet adapter and the measuring oil circuit outlet; internal oil passages are established between the oil inlet adapter and the oil outlet adapter and the internal functional areas.

[0008] The internal functional area includes four major functional blocks: main control, signal acquisition, storage control and quality analysis. The electromagnetic coil, piezoelectric resonant oscillator, thermistor, capacitor plate and humidity-sensitive capacitor are arranged in sequence on the internal oil passage in the oil circuit, which are connected to the signal acquisition functional area accordingly. The signal acquisition functional block includes metal abrasive particle acquisition functional block, dynamic viscosity acquisition functional block, density acquisition functional block, temperature acquisition functional block, oil quality collection functional block, water activity collection functional block and moisture collection functional block.

[0009] The metal abrasive particle collection function block detects the metal abrasive particle content of the lubricating oil through the electromagnetic coil, the dynamic viscosity collection function block and the density collection function block detect the dynamic viscosity and density of the lubricating oil through the piezoelectric resonant oscillator, the temperature collection function block detects the temperature of the lubricating oil through the thermistor, the oil quality collection function block detects the oil quality of the lubricating oil through the capacitor plate, the water activity collection function block and the moisture collection function block detect the water activity and moisture of the lubricating oil through the humidity-sensitive capacitor, and each collection function block will eventually transmit the collection signal to the main control function block.

[0010] The storage control functional block includes a storage control functional block and a data storage functional block, and is responsible for storing the original signal sent by the acquisition functional block.

[0011] The quality analysis functional block includes an oil quality analysis functional block; the oil quality analysis functional block reads the original signal of the acquisition functional block.

[0012] The power supply path includes the power supply interface and the external power supply, which is responsible for centrally supplying power to the system. The power supply interface supports a wide voltage range of 9 to 36 VDC to meet the commonly used 12V / 24V power supply standard or unstable power supply voltage.

[0013] The communication link includes a serial communication interface and a host computer, which is responsible for transmitting the collected parameters and oil quality analysis results to the host computer. The host computer serves as a superior information management system, and the communication interface adopts a serial communication interface.

[0014] Another technical solution adopted by the present invention is a multi-parameter integrated monitoring method for lubricating oil of fracturing equipment. Using the above-mentioned monitoring device, the internal functional area reads the oil sample in the oil circuit to collect the original signals of seven major parameters of metal abrasives, dynamic viscosity, density, temperature, oil quality, water activity, and water content of the lubricating oil of the fracturing equipment in real time, and stores them in the data storage function block; the oil quality analysis function block reads the original signal for real-time calculation to obtain the qualitative and quantitative analysis results of the oil quality and also stores them in the data storage function block; finally, the system sends the original signal and analysis results of the data storage function block to the host computer through the serial communication interface.

[0015] The present invention is also characterized in that:

[0016] The electromagnetic coil is used to read the oil sample in the internal oil passage to detect metal abrasive particles. When the oil flows through ferromagnetic particles, the magnetic field is enhanced and a positive electrical signal is obtained; when the oil flows through non-ferromagnetic particles, a reverse electrical signal is obtained. The size and quantity distribution of the metal abrasive particles can be determined by the strength and size of the electrical signal.

[0017] The dynamic viscosity and density of the oil sample in the internal oil passage are detected by reading the piezoelectric resonant oscillator. First, the main control module sends a vibration signal of a certain frequency. The oil sample produces a damping and attenuation effect on the vibration energy and consumes the kinetic energy of the vibration, thereby causing the attenuation of the amplitude. The main control module then replenishes the lost energy through the circuit to achieve the original amplitude and frequency. Finally, the dynamic viscosity and density of the oil sample are obtained by calculating the replenished energy.

[0018] The temperature of the oil sample in the internal oil passage is read by the thermistor. When the oil sample flows through the thermistor, the corresponding temperature is automatically obtained according to the calibrated temperature reference value.

[0019] The oil quality can be tested by reading the oil sample in the internal oil passage through the capacitor plate thermistor. The oil quality test can be completed based on the dielectric constant conductivity principle, which usually characterizes water, contamination particles and acid value.

[0020] The water activity and moisture content of the oil sample in the internal oil passage are detected by reading the humidity-sensitive capacitor thermistor. Each oil has the ability to dissolve a certain amount of water. Once the saturation point is reached, the excess water is precipitated as free water. After the free water is absorbed by the humidity-sensitive capacitor, it will significantly cause the change of the dielectric constant of the internal polymer material, and then cause the change of the capacitance value. The water activity of the oil sample is converted in this way. At the same time, the moisture value is indirectly calculated based on the saturation curve of the specific oil.

[0021] The beneficial effects of the present invention are as follows: the multi-parameter integrated monitoring device for the lubricating oil of fracturing equipment of the present invention can monitor the multiple parameters of the lubricating oil of fracturing equipment in a small volume, and can more conveniently perform real-time and time-series big data analysis and processing of the equipment, which greatly improves the overall stability and reliability of the sensor and greatly facilitates on-site installation and deployment. Comprehensive monitoring and analysis of the operating parameters of the lubricating oil of fracturing equipment can be carried out, and the comparative analysis of the real-time operating data of the fracturing field operation equipment can be quickly realized, so as to achieve the goal of fine-grained use and control of data by the operation and maintenance business, reduce the equipment failure downtime rate, and reduce the maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall architecture of the multi-parameter integrated monitoring device and method for lubricating oil of fracturing equipment of the present invention.

[0023] In the figure, 1-1. Power supply path, 1-2. Power supply interface, 1-3. External power supply, 2-1. Communication link, 2-2. Serial communication interface, 2-3. Host computer, 3-1. Oil circuit, 3-2. Oil inlet of measuring oil circuit, 3-3. Oil inlet adapter, 3-4. Oil outlet adapter, 3-5. Oil outlet of measuring oil circuit, 4-1. Internal functional area, 4-2. Main control functional block, 4-3. Metal abrasive particle collection functional block, 4-4. Dynamic viscosity collection functional block Energy block, 4-5. Density acquisition function block, 4-6. Temperature acquisition function block, 4-7. Oil quality acquisition function block, 4-8. Water activity acquisition function block, 4-9. Moisture collection function block, 4-10. Storage control function block, 4-11. Data storage function block, 4-12. Oil quality analysis function block, 4-13. Electromagnetic coil, 4-14. Piezoelectric resonator, 4-15. Thermistor, 4-16. Capacitor plate, 4-17. Humidity-sensitive capacitor. DETAILED DESCRIPTION

[0024] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Example 1

[0026] The multi-parameter integrated monitoring device for lubricating oil of fracturing equipment of the present invention has a structure as follows Figure 1 As shown, it includes four parts: power supply path 1-1, communication link 2-1, oil circuit 3-1 and internal functional area 4-1. Power supply path 1-1, communication link 2-1 and oil circuit 3-1 respectively establish system power supply, communication and oil circuit; communication link 2-1 is responsible for establishing communication with the upper level information management system, and transmitting the collected parameters and oil quality analysis results to the upper level information management system; oil circuit 3-1 is responsible for establishing a measurement oil circuit bypass, and oil circuit 3-1 is responsible for connecting the internal functional area 4-1 through the internal oil passage, and the internal functional area 4-1 reads the oil sample in the oil passage.

[0027] Example 2

[0028] The oil circuit 3-1 includes a measuring oil circuit inlet 3-2, an oil inlet adapter 3-3, an oil outlet adapter 3-4 and a measuring oil circuit outlet 3-5. A one-way flow circuit is established in the order of the measuring oil circuit inlet 3-2, the oil inlet adapter 3-3, the acquisition function block, the oil outlet adapter 3-4 and the measuring oil circuit outlet 3-5.

[0029] A dedicated low-pressure oil pipe is connected between the oil inlet 3-2 of the measuring oil circuit and the oil inlet adapter 3-3, and between the oil outlet adapter 3-4 and the oil outlet 3-5 of the measuring oil circuit; an internal oil passage is established between the oil inlet adapter 3-3 and the oil outlet adapter 3-4 and the internal functional area 4-1. A certain pressure difference should be maintained between the oil inlet and the oil outlet of the entire oil circuit 3-1 to form a flow circuit to ensure accurate measurement results.

[0030] The internal functional area 4-1 includes four functional blocks: main control, signal acquisition, storage control and quality analysis. The main control functional block includes the main control functional block 4-2, which is the core component responsible for overall control management of signal acquisition, data storage and quality analysis, coordinating data transmission of other blocks in the internal functional area 4-1, and connecting to external interfaces such as the power supply interface 1-2 and the serial communication interface 2-2.

[0031] The internal oil passage in the oil circuit 3-1 is provided with an electromagnetic coil 4-13, a piezoelectric resonator 4-14, a thermistor 4-15, a capacitor plate 4-16, and a humidity-sensitive capacitor 4-17 in sequence, which are connected to the signal acquisition functional area. The signal acquisition functional area includes seven parameters: a metal abrasive particle acquisition functional block 4-3, a dynamic viscosity acquisition functional block 4-4, a density acquisition functional block 4-5, a temperature acquisition functional block 4-6, an oil quality acquisition functional block 4-7, a water activity acquisition functional block 4-8, and a moisture acquisition functional block 4-9.

[0032] The metal abrasive particle collection function block 4-3 detects the metal abrasive particle (ferromagnetic particles, non-ferromagnetic particles) content of the lubricating oil liquid through the electromagnetic coil 4-13, and determines the size and quantity distribution of the metal abrasive particles based on the principle that ferromagnetic particles and non-ferromagnetic particles will generate proportional positive / reverse electrical signals when flowing through the magnetic field.

[0033] The dynamic viscosity acquisition function block 4-4 and the density acquisition function block 4-5 detect the dynamic viscosity and density of the lubricating oil through the piezoelectric resonant oscillator 4-14. Based on the principle of amplitude / frequency compensation, the dynamic viscosity and density of the oil sample can be obtained by calculating the supplementary energy.

[0034] The temperature acquisition function block 4-6 detects the temperature of the lubricating oil through the thermistor 4-15. When the oil sample flows through the thermistor, the corresponding temperature is automatically obtained according to the calibrated temperature reference value.

[0035] The oil quality acquisition function block 4-7 detects the lubricating oil quality (dielectric constant) through the capacitor plate 4-16. The oil quality detection can be completed based on the conductivity (dielectric constant) principle, which usually characterizes water, contamination particles and acid value.

[0036] The water activity acquisition function block 4-8 ​​and the moisture acquisition function block 4-9 detect the water activity (saturation) and moisture (PPM) of the lubricating oil through the humidity-sensitive capacitor 4-17. This is based on the principle that after free water is absorbed by the humidity-sensitive capacitor, it will significantly cause the humidity-sensitive capacitor value to change. The water activity (saturation) of the oil sample is converted based on this. At the same time, the moisture (PPM) value is indirectly calculated based on the saturation curve of the specific oil product.

[0037] The seven parameter acquisition function blocks, including metal abrasive acquisition function block 4-3, dynamic viscosity acquisition function block 4-4, density acquisition function block 4-5, temperature acquisition function block 4-6, oil quality acquisition function block 4-7, water activity acquisition function block 4-8 ​​and water acquisition function block 4-9, follow the principle of "shared sampling, independent work" and obtain oil samples through only one loop of oil loop 3-1. Each function block does not affect each other. When a certain acquisition function block fails or malfunctions, the remaining acquisition function blocks can still work normally. Each acquisition function block will eventually transmit the acquisition signal to the main control function block 4-2.

[0038] The storage control functional block includes a storage control functional block 4-10 and a data storage functional block 4-11. The storage control functional block 4-10 and the data storage functional block 4-1 are based on the mainstream data transmission protocol and are responsible for storing the original signals sent by the metal abrasive collection functional block 4-3, the dynamic viscosity collection functional block 4-4, the density collection functional block 4-5, the temperature collection functional block 4-6, the oil quality collection functional block 4-7, the water activity collection functional block 4-8 ​​and the moisture collection functional block 4-9 in the collection functional block; at the same time, they support the oil quality analysis functional block 4-12 to read data for analysis and store the analysis results.

[0039] The quality analysis functional block includes an oil quality analysis functional block 4-12; the oil quality analysis functional block 4-12 reads the original signals of the metal abrasive collection functional block 4-3, the dynamic viscosity collection functional block 4-4, the density collection functional block 4-5, the temperature collection functional block 4-6, the oil quality collection functional block 4-7, the water activity collection functional block 4-8 ​​and the moisture collection functional block 4-9, calculates the oil quality in real time based on the built-in algorithm, and obtains a qualitative and quantitative analysis result.

[0040] Example 3

[0041] The power supply path 1-1 includes a power supply interface 1-2 and an external power supply 1-3, which are responsible for centralized power supply for the system. The power supply interface 1-2 supports a wide voltage range of 9 to 36 VDC to meet the common 12V / 24V power supply standard or unstable power supply voltage.

[0042] The communication link 2-1 includes a serial communication interface 2-2 and a host computer 2-3, which is responsible for transmitting the collected parameters and the oil quality analysis results to the host computer 2-3, which serves as the upper information management system. Among them, the communication interface 2-2 adopts a serial communication interface, which has simple wiring, strong anti-interference ability, and high communication rate, and maximizes the transmission quality without the need to send and receive data at the same time; the communication protocol adopts Modbus RTU, which is compatible with most network communication equipment on the market.

[0043] Example 4

[0044] The present invention is a multi-parameter integrated monitoring method for lubricating oil of fracturing equipment. The above-mentioned monitoring device is used. The internal functional area 4-1 centrally collects and stores relevant parameters of the fracturing equipment. The collection functions of each parameter follow the principle of "shared sampling, independent work". The oil sample is obtained only through one oil loop, and the corresponding signals are collected respectively. The functions do not affect each other. When a certain collection function fails or malfunctions, the other collection functions can still work normally. The collected original signals are calculated in real time to obtain the qualitative and quantitative oil quality analysis results.

[0045] The internal functional area 4-1 reads the oil sample in the oil circuit 3-1, collects the original signals of seven major parameters of the lubricating oil of the fracturing equipment, including metal abrasive particles (ferromagnetic particles, non-ferromagnetic particles), dynamic viscosity, density, temperature, oil quality (dielectric constant), water activity (saturation), and water content (PPM) in real time, and stores them in the data storage functional block 4-11; the oil quality analysis functional block 4-12 reads the original signal and performs real-time calculation to obtain the qualitative and quantitative analysis results of the oil quality and also stores them in the data storage functional block 4-11; finally, the system sends the original signal and analysis results of the data storage functional block 4-11 to the host computer 2-3 through the serial communication interface 2-3.

[0046] The electromagnetic coil 4-13 is used to read the oil sample in the internal oil passage to detect metal abrasive particles (ferromagnetic particles, non-ferromagnetic particles). When the oil flows through the ferromagnetic particles, the magnetic field is enhanced and a positive electrical signal is obtained; when the oil flows through the non-ferromagnetic particles, a reverse electrical signal is obtained. The size and quantity distribution of the metal abrasive particles can be determined by the strength and size of the electrical signal.

[0047] The piezoelectric resonant oscillator 4-14 is used to read the oil sample in the internal oil passage to detect the dynamic viscosity and density. First, the main control module 4-2 sends a vibration signal of a certain frequency. The oil sample has a damping effect on the vibration energy and consumes the kinetic energy of the vibration, thereby causing the attenuation of the amplitude. The main control module then replenishes the lost energy through the circuit to achieve the original amplitude and frequency. Finally, the dynamic viscosity and density of the oil sample are obtained by calculating the replenished energy.

[0048] The temperature of the oil sample in the internal oil passage is read by the thermistor 4-15. When the oil sample flows through the thermistor, the corresponding temperature is automatically obtained according to the calibrated temperature reference value.

[0049] The oil sample of the internal oil passage is read through the capacitor plate thermistor 4-16 to detect the oil quality (dielectric constant). Lubricating oil is a complex hydrocarbon mixture. Considering it as a dielectric, as the lubricating oil is used, the quality decay is mainly reflected in the oxidation reaction in contact with air, the consumption of lubricating oil internal improvers, anti-wear agents and other additives, and external pollution such as moisture and solid particles. Therefore, the oil quality detection can be completed based on the principle of conductivity (dielectric constant), which usually characterizes water, contamination particles and acid value.

[0050] The water activity (saturation) and moisture (PPM) of the oil sample in the internal oil passage are detected through the humidity-sensitive capacitor thermistor 4-17. Since each oil has the ability to dissolve a certain amount of water, once the saturation point is reached, the excess water precipitates in the form of free water. After the free water is absorbed by the humidity-sensitive capacitor, it will significantly cause the change of the dielectric constant of the internal polymer material, and then cause the change of the capacitance value, which is converted to obtain the water activity (saturation) of the oil sample. At the same time, according to the saturation curve of the specific oil, the moisture (PPM) value is indirectly calculated.

[0051] The multi-parameter integrated monitoring device for lubricating oil of fracturing equipment of the present invention comprises four parts: power supply path, communication link, oil circuit and internal functional area. Refined demand management is realized by constructing the multi-parameter integrated monitoring device, multi-party data integration and sharing are realized, all data information involved in the implementation process are comprehensively mastered and monitored, and high-precision, large-range, small-volume, integrated multi-parameter comprehensive measurement of the lubricating oil of fracturing equipment is realized.

Claims

1. A multi-parameter integrated monitoring device for lubricating oil in fracturing equipment, characterized in that: It includes a power supply path (1-1), a communication link (2-1), an oil circuit (3-1), and an internal functional area (4-1). The power supply path (1-1), the communication link (2-1), and the oil circuit (3-1) respectively establish the system power supply, communication, and oil circuit; the communication link (2-1) is responsible for establishing communication with the upper-level information management system, and transmitting the collected parameters and oil quality analysis results to the upper-level information management system; the oil circuit (3-1) is responsible for establishing a measurement oil circuit bypass, and the oil circuit (3-1) is responsible for connecting the internal functional area (4-1) through the internal oil circuit, and the internal functional area (4-1) reads the oil sample in the oil circuit.

2. The multi-parameter integrated monitoring device for lubricating oil of fracturing equipment according to claim 1, characterized in that: The oil circuit (3-1) comprises a measuring oil circuit oil inlet (3-2), an oil inlet adapter (3-3), an oil outlet adapter (3-4) and a measuring oil circuit oil outlet (3-5); a dedicated low-pressure oil pipe is connected between the measuring oil circuit oil inlet (3-2) and the oil inlet adapter (3-3) and between the oil outlet adapter (3-4) and the measuring oil circuit oil outlet (3-5); and an internal oil passage is established between the oil inlet adapter (3-3) and the oil outlet adapter (3-4) and the internal functional area (4-1).

3. The multi-parameter integrated monitoring device for lubricating oil of fracturing equipment according to claim 2, characterized in that: The internal functional area (4-1) includes four major functional blocks: main control, signal acquisition, storage control and quality analysis. The internal oil passage in the oil circuit (3-1) is provided with an electromagnetic coil (4-13), a piezoelectric resonator (4-14), a thermistor (4-15), a capacitor plate (4-16) and a humidity-sensitive capacitor (4-17) in sequence and connected to the signal acquisition functional area. The signal acquisition functional block includes a metal abrasive particle acquisition functional block (4-3), a dynamic viscosity acquisition functional block (4-4), a density acquisition functional block (4-5), a temperature acquisition functional block (4-6), an oil quality acquisition functional block (4-7), a water activity acquisition functional block (4-8) and a moisture acquisition functional block (4-9).

4. The multi-parameter integrated monitoring device for lubricating oil of fracturing equipment according to claim 3, characterized in that: The metal abrasive particle collection function block (4-3) detects the metal abrasive particle content of the lubricating oil liquid through the electromagnetic coil (4-13), the dynamic viscosity collection function block (4-4) and the density collection function block (4-5) detect the dynamic viscosity and density of the lubricating oil liquid through the piezoelectric resonator (4-14), the temperature collection function block (4-6) detects the temperature of the lubricating oil liquid through the thermistor (4-15), the oil quality collection function block (4-7) detects the oil quality of the lubricating oil liquid through the capacitor plate (4-16), the water activity collection function block (4-8) and the moisture collection function block (4-9) detect the water activity and moisture of the lubricating oil liquid through the humidity-sensitive capacitor (4-17), and each collection function block finally transmits the collection signal to the main control function block (4-2).

5. The multi-parameter integrated monitoring device for lubricating oil of fracturing equipment according to claim 4, characterized in that: The storage control functional block comprises a storage control functional block (4-10) and a data storage functional block (4-11), which are responsible for storing the original signal sent by the acquisition functional block.

6. The multi-parameter integrated monitoring device for lubricating oil of fracturing equipment according to claim 5, characterized in that: The quality analysis functional block comprises an oil quality analysis functional block (4-12); the oil quality analysis functional block (4-12) reads the original signal of the acquisition functional block.

7. The multi-parameter integrated monitoring device for lubricating oil of fracturing equipment according to claim 6, characterized in that: The power supply path (1-1) includes a power supply interface (1-2) and an external power supply (1-3), which are responsible for centralized power supply for the system. The power supply interface (1-2) supports a wide voltage range of 9 to 36 VDC to meet the needs of commonly used 12V / 24V power supply standards or unstable power supply voltage.

8. The multi-parameter integrated monitoring device for lubricating oil of fracturing equipment according to claim 7, characterized in that: The communication link (2-1) comprises a serial communication interface (2-2) and a host computer (2-3), and is responsible for transmitting the collected parameters and the oil quality analysis results to the host computer (2-3). The host computer (2-3) serves as a superior information management system, and the communication interface (2-2) adopts a serial communication interface.

9. A multi-parameter integrated monitoring method for lubricating oil of fracturing equipment, using the monitoring device of claim 8, characterized in that: The internal functional area (4-1) reads the oil sample in the oil circuit (3-1) to collect the original signals of seven major parameters of the lubricating oil of the fracturing equipment, including metal abrasive particles, dynamic viscosity, density, temperature, oil quality, water activity, and water content in real time, and stores them in the data storage functional block (4-11); the oil quality analysis functional block (4-12) reads the original signals and performs real-time calculations to obtain the qualitative and quantitative analysis results of the oil quality and also stores them in the data storage functional block (4-11); finally, the system sends the original signals and analysis results of the data storage functional block (4-11) to the host computer (2-3) through the serial communication interface (2-2).

10. The multi-parameter integrated monitoring method for lubricating oil of fracturing equipment according to claim 9, characterized in that: The electromagnetic coil (4-13) is used to read the oil sample in the internal oil passage to detect metal abrasive particles. When the oil flows through ferromagnetic particles, the magnetic field is enhanced to obtain a positive electrical signal; when the oil flows through non-ferromagnetic particles, a reverse electrical signal is obtained. The size and quantity distribution of the metal abrasive particles can be determined by the strength and size of the electrical signal. The piezoelectric resonant vibrator (4-14) is used to read the oil sample in the internal oil passage to detect the dynamic viscosity and density. First, the main control module (4-2) sends a vibration signal of a certain frequency, and the oil sample produces a damping and attenuation effect on the vibration energy and consumes the kinetic energy of the vibration, thereby causing the attenuation of the amplitude; the main control module (4-2) then replenishes the lost energy through the circuit to achieve the original amplitude and frequency; finally, the dynamic viscosity and density of the oil sample are obtained by calculating the replenished energy; The temperature of the oil sample in the internal oil passage is read by the thermistor (4-15). When the oil sample flows through the thermistor, the corresponding temperature is automatically obtained according to the calibrated temperature reference value; The oil quality is detected by reading the oil sample in the internal oil passage through the capacitor plate thermistor (4-16). The oil quality detection can be completed based on the dielectric constant conductivity principle, which usually characterizes water, contamination particles and acid value; The water activity and moisture content of the oil sample in the internal oil passage are detected by reading the humidity-sensitive capacitor thermistor (4-17). Each oil has the ability to dissolve a certain amount of moisture. Once the saturation point is reached, the excess moisture precipitates in the form of free water. After the free water is absorbed by the humidity-sensitive capacitor, it will significantly cause a change in the dielectric constant of the internal polymer material, and then cause a change in the capacitance value. The water activity of the oil sample is thus converted, and the moisture value is indirectly calculated based on the saturation curve of the specific oil.

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