NL2031132B1 - A Heavy Oil Production Pipe Non-intrusion Temperature Measurement System - Google Patents

Abstract

The present invention discloses a heavy oil production pipe non-intrusion temperature measurement system, characterized in that the system comprises a hardware system and a software system, the hardware system comprises SCM minimum system, a temperature 5 measurement module, an industrial transmission module, a data exchange module, a power supply module and an isolating circuit, and the software system comprises a SCM main program, a temperature measurement program, a data processing program, an industrial transmission program, a data exchange program and a temperature conversion program, The present invention supplies power for the temperature measurement module via the isolating 10 circuit to reduce the impact of noises on the temperature measurement circuit and prevent the system power affecting the temperature measurement precision. By applying low-power components, the working current of the hardware circuit is reduced, which meets the low cost requirement. Through moving average filter processing of data, the temperature measurement error can be reduced, and the measurement precision can be improved. The relationship 15 between the temperature and the measured resistance is obtained through least square f1t, which facilitates temperature calculation and achieves higher measurement efficiency than the traditional on-site temperature measurement. Figure ]

Description

A Heavy Oil Production Pipe Non-intrusion Temperature Measurement System

Technical Field

The present invention relates to the technical field of heavy oil production, particularly to a heavy oil production pipe non-intrusion temperature measurement system.

Background Art

According to the standard SY / T 6169-1995 Oi! Deposit Classification of the oil and gas industry, crude oil whose viscosity is greater than 50mPa-s under formation conditions is called heavy oil. The composition of heavy oil is complex. The difference between heavy oil and crude oil is the biodegradation degree. The degradation degree of heavy oil is much higher than that of ordinary crude oil. For its high viscosity, heavy oil is hard to be exploited and transported. In the production process of heavy oil, the most key point is to reduce its viscosity and enhance its liquidity. Generally speaking, there are two heavy oil production technologies: hot production and cold production. The main method and idea are to improve the permeability of the oil reservoir, improve the pressure difference and reduce the viscosity of the heavy oil.

Due to the change in temperature, the viscosity of heavy oil will change a lot. So, temperature plays a key role in affecting the production of heavy oil. Thus, it is of great significance for heavy oil production to determine the nature and distribution of the temperature field inside the pipe under the well, select a proper heating mode, analyze the production effect as the temperature changes, and determine relevant parameters, such as the pump depth and heating, etc.

Currently, on-site temperature measurement is mainly conducted artificially, and its measurement efficiency is low. Traditional temperature measurement systems need flame operation and shutdown during installation. The installation process is complex, the power consumption is high, there are potential safety hazards, and loss of production may be caused.

In addition, the cost of foreign non-intrusion temperature transmitters is too high, wide application of foreign non-intrusion temperature transmitters is inapplicable. Therefore, the present invention provides a heavy oil production pipe non-intrusion temperature measurement system to address problems in prior art.

Summary of the Invention

For the above problems, the present invention aims to provide a heavy oil production pipe non-intrusion temperature measurement system to address some problems, like the low efficiency of on-site temperature measurement, high power consumption of traditional 1 temperature measurement systems, complex installation process, potential safety hazards and the failure to realize wide application due to the high cost of foreign non-intrusion temperature transmitters.

The purpose of the present invention is realized with the following technical solution: A heavy oil production pipe non-intrusion temperature measurement system, characterized in that: the system comprises a hardware system and a software system, said hardware system comprises SCM minimum system, a temperature measurement module, an industrial transmission module, a data exchange module, a power supply module and an isolating circuit, said temperature measurement module, industrial transmission module, data exchange module and power supply module connect the SCM minimum system, said power supply module connects the temperature measurement module via the isolating circuit, said SCM minimum system is established with microcontroller as the main control chip and is provided with a reset circuit, start mode selection circuit and SWD program downloading circuit, said temperature measurement module comprises the pipe wall temperature acquisition unit and the ambient temperature acquisition unit, said data exchange module comprises the HART communication unit and the screen display unit for displaying the specific numerical value of the measured temperature, said power supply module supplies power for the whole system in the way of loop power supply, and said isolating circuit supplies power for the temperature measurement module separately;

Said software system comprises a SCM main program, a temperature measurement program, a data processing program, an industrial transmission program, a data exchange module and a temperature conversion program, said SCM main program controls the software operation of the whole system, said temperature measurement program acquires the temperature measurement data in the temperature measurement module, said data processing program carries out fit processing of temperature data acquired through moving average filter processing with the least square method, said industrial transmission program outputs the processed temperature measurement data in the form of 4mA-20mA current, said data exchange program transmits and receives data via the HART communication unit, temperature information is displayed in real time via the screen display unit, and said temperature conversion program calculates the temperature inside the pipe based on the ambient temperature and the pipe wall temperature obtained based on the thermodynamic principle.

The further improvement is as follows: Said main control chip adopts microcontroller

STM32L011F4P6, the power supply module of said hardware system works under the 4mA- 20mA current, the measured scope of temperature of said temperature measurement module is 2

-40°C-350°C, and said HART communication unit provides HART communication for the hardware system based on the international HART application layer and data link layer provisions.

The further improvement is as follows: Software design of said software system is programed based on Keil uvision5 by using the Windows system, and the programming language is C language.

The further improvement is as follows: Said temperature measurement module adopts the temperature acquisition chip AD7124-4, when measuring the pipe wall temperature, chip configuration should be conducted with MUX at first, and then the pipe wall temperature data should be acquired with the temperature measurement element platinum resistance Pt100, signals are amplified via PGA, the measured analog value measured is converted into the digital value that is transmitted into the main control chip at last, and said ambient temperature acquisition unit measures the ambient temperature via the built-in temperature sensor.

The further improvement is as follows: Said HART communication unit realizes HART communication of the circuit via the AD5700 applied, said screen display unit is an LCD screen, and the drive chip is HT1621.

The further improvement is as follows: Said isolating circuit converts the SV direct current output from the loop end of the power supply module into alternating current via the multi- vibrator, and then the multi-vibrator generates square waves to drive the transformer, rectifies current into direct current to supply power for the temperature measurement module.

The further improvement is as follows: Said SCM main program controls the initialization of the main control chip, the screen display unit and the temperature acquisition chip.

The further improvement is as follows: Said temperature conversion program calculates the temperature inside the pipe with the following formula: 4-15 3 es A

A

Wherein, tl is the ambient temperature measured by the temperature measurement module, t2 is the pipe wall temperature measured by the temperature measurement module, t3 is the temperature inside the pipe, Al is the coefficient of thermal conductivity of the ambient temperature, the numerical value is the coefficient of thermal conductivity in the air, A2 is the coefficient of thermal conductivity of the pipe material, the numerical value is determined by 3 the material pipe, bl is the distance from the built-in temperature sensor to the pipe wall, and b2 is the length of the temperature measurement element.

The beneficial effects of the present invention are as follows: The present invention supplies power for the temperature measurement module via the isolating circuit to reduce the impact of noises on the temperature measurement circuit and prevent the system power affecting the temperature measurement precision. By applying low-power components, the working current of the hardware circuit is reduced, which meets the low cost requirement.

Through moving average filter processing of data, the temperature measurement error can be reduced, and the measurement precision can be improved. The relationship between the temperature and the measured resistance is obtained through least square fit, which facilitates temperature calculation. HART communication is provided for the hardware system via HART communication unit, and the specific numerical value of the measured temperature is displayed via the screen display unit to facilitate data transmission and users’ direct reading of the numerical value of the measured temperature. Its efficiency is higher than that of on-site temperature measurement. Additionally, due to non-intrusion measurement enables safer and more convenient system installation and commissioning, and its cost is lower than that of foreign non-intrusion temperature transmitters, so it is suitable for wide application.

Description of the Drawings

In order to further explain the technical scheme in the embodiments of the present invention or in the prior art, the drawings related to the description of the embodiments or the prior art are described below. It is obvious that the drawings herein are only some embodiments of the present invention and for those skilled in the art, other drawings can be obtained from them without creative endeavors.

Figure 1 is the schematic diagram showing the structure of the hardware system in one embodiment of the present invention;

Figure 2 is the schematic diagram showing the structure of the software system in one embodiment of the present invention;

Figure 3 is the diagram showing the circuit of the SCM minimum system in one embodiment of the present invention;

Figure 4 is the schematic diagram of the reset circuit in one embodiment of the present invention;

Figure 5 is the diagram showing the AD7124 peripheral interface circuit in one embodiment of the present invention; 4

Figure 6 is the diagram showing the AD5421 external interface circuit in one embodiment of the present invention;

Figure 7 is the diagram showing the AD5700 peripheral interface circuit in one embodiment of the present invention;

Figure 8 1s the diagram showing the HT 1621 interface circuit in one embodiment of the present invention.

Embodiments

Next, clear and complete descriptions of the technical solution in the embodiments of the present invention are stated based on drawings of embodiments of the present invention,

Obviously, the described embodiments are only some parts, not the whole ones. Based on the embodiments of the present invention, all the other embodiments obtained by those ordinarily skilled in the art without making creative endeavors fall into the scope of protection of the present invention.

By referring to Figure 1, Figure 2 and Figure 3, this embodiment provides a heavy oil production pipe non-intrusion temperature measurement system, characterized in that: the system comprises a hardware system and a software system, the hardware system comprises

SCM minimum system, a temperature measurement module, an industrial transmission module, a data exchange module, a power supply module and an isolating circuit, the temperature measurement module, industrial transmission module, data exchange module and power supply module connect the SCM minimum system, the power supply module connects the temperature measurement module via the isolating circuit, the SCM minimum system is established with microcontroller STM32L011F4P6 as the main control chip and is provided with a reset circuit, start mode selection circuit and SWD program downloading circuit to ensure basic operation of STM32L011F4P6, the downloading circuit interface of SWD program serves as the commissioning interface, the temperature measurement module applies the RTD four-wire connection method to measure temperature and comprises a pipe wall temperature acquisition unit and an ambient temperature acquisition unit, the industrial transmission module applies the signal output chip AD5421 to realize 4mA-20mA output of the circuit, the data exchange module comprises the HART communication unit and the screen display unit for displaying the specific numerical value of the measured temperature, the power supply module supplies power for the whole system in the way of loop power supply, and the isolating circuit supplies power for the temperature measurement module separately; 5

The kernel of STM32L011F4P6 is ARM32-bit Cortex®-MO+CPU. Under the operation mode, its power consumption is only 76u A/MHz. In the case of no loss of any RAM data, the power consumption under the stop mode is 0.54uA, and it only consumes Sus when it is waken up from the flash memory mode;

The software system comprises a SCM main program, a temperature measurement program, a data processing program, an industrial transmission program, a data exchange module and a temperature conversion program, the SCM main program controls the software operation of the whole system and takes charge of the execution sequence of working programs of the whole system and coordination between different modules, the temperature measurement program acquires the temperature measurement data in the RTD four-wire temperature measurement circuit in the temperature measurement module, the data processing program carries out fit processing of temperature data acquired through moving average filter processing with the least square method, the industrial transmission program outputs the processed temperature measurement data in the form of 4mA-20mA current, the data exchange program transmits and receives data via the HART communication unit, temperature information is displayed in real time via the screen display unit, and the temperature conversion program calculates the temperature inside the pipe based on the ambient temperature and the pipe wall temperature obtained based on the thermodynamic principle.

The power supply module of the hardware system works under the 4mA-20mA current, the measured scope of temperature of the temperature measurement module is -40°C-350°C, and the HART communication unit provides HART communication for the hardware system based on the international HART application layer and data link layer provisions.

Software design of the software system is programed based on Keil uvision5 by using the

Windows system, and the programming language is C language.

The temperature measurement module adopts the temperature acquisition chip AD7124- 4 and provides three power supply modes, including 2.7V-3.6V single-analog power supply, 1.8V dual power supply, 1.65V-3.6V digital power supply, and the chip can realize three-wire or four-wire RTD measurement. This application adopts the four-wire connection method. The chip applies 32-pin LFCSP encapsulation. There is a bare bonding pad at the bottom. The bonding pad adopts AVSS connection to prevent instable chip power. When measuring the pipe wall temperature, chip configuration should be conducted with MUX at first, and then the pipe wall temperature data should be acquired with the temperature measurement element platinum resistance Pt100, signals are amplified via PGA, the measured analog value measured is converted into the digital value that is transmitted into the main control chip at last, and said 6 ambient temperature acquisition unit measures the ambient temperature via the built-in temperature sensor. Data exchange between the main control chip STM32L011F4P6 and the temperature acquisition chip AD7124-4Y and the signal output chip AD5421 is achieved via

SPI protocol, power of the main control chip STM32L011F4P6 is directly supplied by the 3.3V logic power provided by the loop side of the signal output chip AD5421, and the power of the temperature acquisition chip AD7124 is also supplied by the signal output chip AD5421.

The HART communication unit realizes HART communication of the circuit via the

AD5700 applied, the screen display unit is an LCD screen, and the drive chip is HT 1621.

The isolating circuit converts the 5V direct current output from the loop end of the power supply module into alternating current via the multi-vibrator, and then the multi-vibrator generates square waves to drive the transformer TTBS051-T, rectifies current into direct current to supply power for the temperature acquisition chip AD7124-4 in the temperature measurement module.

The SCM main program controls the initialization of the main control chip, the screen display unit and the temperature acquisition chip.

The temperature conversion program calculates the temperature inside the pipe with the following formula: ob,

Ee

Wherein, tl is the ambient temperature measured by the temperature measurement module, t2 is the pipe wall temperature measured by the temperature measurement module, t3 is the temperature inside the pipe, A1 is the coefficient of thermal conductivity of the ambient temperature, the numerical value is the coefficient of thermal conductivity in the air, A2 is the coefficient of thermal conductivity of the pipe material, the numerical value is determined by the material pipe, bl is the distance from the built-in temperature sensor to the pipe wall, and b2 is the length of the temperature measurement element.

In this embodiment, magnetic coupling isolation chip ADuM1441 is adopted to realize signal isolation. It has four independent isolation channels, can realize several-channel configuration and ultra-low power operation and conforms to the 4mA-20mA loop process control. Since the power circuit in this design is not grounded, power supply for analog signals and digital signals is separated, preventing reduction of the signal transmission quality arising 7 from interference caused by digital-analog power supply. This embodiment applies linear voltage regulator ADP162 to isolate 3.3V low-power supply voltage in the power circuit.

As shown in Figure 4, the reset circuit comprises three parts, i.e. the button SW-PB, the resistor R32 and the capacitor C42. It has two reset forms: power-on reset and manual reset.

When power is not supplied, there is no voltage at the NRST port. After supplying power, there is the capacitor C42, so the voltage will not reach 3.3V immediately, but there will be a slow charging process. So, the level at the NRST end will be low as a whole within a certain period when the chip can reset. By pressing S1, the charge on C42 will disappear, and there will be no voltage at the NRST port. By loosening S1, the chip will reset.

As shown in Figure 5, the peripheral interface circuit of AD7124 hardware circuit applies single power supply, so AVSS can connect DGND with only one grounding layer, AVDD and

IOVDD is generated by using low dropout voltage regulator ADP162, and they are set as 3.3V and 1.8V respectively; When high-resolution ADC 1s adopted, the decoupling should be very good. AD7124-4 has two power pins: AVDD and IOVDD. Their reference is AVSS and DGND respectively, 1uF tantalum capacitor and 0.1uF capacitor are connected, and then AVDD is decoupled to AVSS on each pin, 0.1uF capacitor of each power supply should be close to this component as possible, and the best situation is to directly fact it; 1uF tantalum capacitor and 0.1uF capacitor are connected, and then IOVDD is decoupled to DGND, and all the analog input should be decoupled to AVSS; If an external reference voltage source is adopted, the

REFINx(+) and REFINX(-) pins should be decoupled to AVSS; AD7124-4 also has two LDO voltage regulators on the chip. One is for regulating AVDD power supply, and the other is for regulating IOVDD power supply. REGCAPA pin should be decoupled to AVSS with 0.1uF capacitor. Similarly, REGCAPD pin should be decoupled to DGND with 0.1uF. After the internal reference voltage source is selected, the reference voltage source connects the modulator inside the component. It can also be supplied via REFOUT pin. When the internal reference voltage source is effective, REFOUT needs one 0.1uF decoupling capacitor.

As shown in Figure 6, SDIN, SDO, SCLK and SYNC pins of AD5421 directly communicate with SCM based on SPI protocol. Wherein, pin SYNC is the DAC chip selection signal. When SYNC level 1s low, data transmission starts. The fault alarm function of AD5421 is provided for the controller via the FAULT pin and the internal fault register. When the

FAULT pin level is high, it indicates that circuit faults are detected. 3.3V digital power supply of DVDD pin is output for use by microcontroller STM32L011F4P6 and AD5700.

As shown in Figure 7, the voltage source of AD5700 is from the pin DVDD of AD5421, and its voltage is 3.3V. HART input is realized by RC filter, and it couples with the ADC IP 8 pin in the modulator via the LOOP+ end. RC filter belongs to the level I in this mechanism. It can modulate HART in working and can shield impacts of the external electromagnetic environment to some extent. This embodiment applies 150kQ external band pass filter which can control internal current of the system properly and ensure that relevant elements will not be damaged or destroyed due to overload. In addition, in this environment, the input end under normal conditions can bear impact arising from higher voltage. So, it does not need an additional protection circuit in practical application and can ensure stable running of the system with its own protection mechanism.

As shown in Figure 8, there are only has four pins inside HT 1621 as interfaces. CS is used for initialization. When the state of CS is "1", the exchange order between the main controller and HT1621 will be invalid, and initialization operation will be carried out for it. DATA realizes data input and output in the system. In other devices, read-write operation of system data is realized via this port. RD represents input of the read clock. Between the rising edge and the falling edge of signals of this pin, the main controller can read data. WR represents input of the write clock. This pin is valid on the signal rising edge.

In this embodiment, data exchange between the main control chip STM32L011F4P6 and the temperature acquisition chip AD7124-4Y and the signal output chip AD5421 is achieved via SPI protocol. The data input / output chips share the data port when connecting the main controller, so it is enabled via chip selection only when switching the working mode, and the signal transmission will be impacted if there is interference at the data port, and the measurement precision will be impacted as a result. To prevent mutual impacts of communication protocols, isolating chip ADuM 1441 is used to isolate the signal input chip and signal output chip. The output pin between the signal output chip AD5421 and the SCM

STM32LO011F4P6 is the same, I/O port inside the SCM can be saved too by using the isolating chip, which can guarantee the reliability of communication and improve the precision.

In this embodiment, loop power is supplied via AD5421 chip, and then rest parts of the circuit is supplied with power. Wherein, the power of the main control chip STM32L011F4P6 is directly supplied by the 3.3V logic power provided by the loop side of the signal output chip

AD5421, and AD7124 is also supplied by AD5421. However, AD7124 chip is a signal acquisition chip. To ensure the precision of signal acquisition and prevent interference of noises for the circuit, it should be supplied with power separately. After outputting 5V DC excitation power supply via the REGOUT pin by setting a voltage regulator for AD5421, it is converted into alternating current by the multi-vibrator, TTB5051-T the multi-vibrator generates square waves to drive the transformer TTB5051-T, 5V voltage on the secondary side is rectified and 9 modulated by the voltage regulator ADP162, and after current is rectified into direct current, the voltage regulator ADP162 outputs 3.3V voltage to supply power for the signal acquisition chip AD7124.

Last it 1s noted that the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention. Within the spirit and principles in the present invention, any amendment done, equivalent replacement, improvement, etc. should be included within protection scope of the present invention.

Claims (8)

Conclusions 1. A non-intrusive temperature measurement system in pipeline for heavy oil extraction, characterized in that: The system consists of both a hardware system and a software system; The above hardware system consists of miniature system of single-chip microcomputer, temperature detection module, industrial transmission module, data interface module, power supply module, and isolated circuit; The above-mentioned temperature detection module, industrial transmission module, data interface module, and power supply module are connected to the miniaturized system of single-chip microcomputer; The power supply module is connected to the temperature detection module through the insulated circuit. The above-mentioned minimature system of single-chip microcomputer is constructed and equipped by a microcontroller used as the master chip with reset circuit, start mode selection module, and SWD circuit for download program, The above-mentioned temperature detection module consists of pipe shell temperature collection collection unit and ambient temperature collection unit; The above data interface module consists of HART communication unit and screen display unit for displaying specific values of measured temperature; The aforementioned power module powers the entire system through the loop; The above-mentioned isolated circuit powers the temperature detection module separately; The above-mentioned software system consists of single-chip microcomputer main program, temperature detection program, data processing program, industrial transmission program, data interface program, and temperature conversion program. The above-mentioned single-chip microcomputer main program controls the software operation of the entire system; The above-mentioned temperature detection program collects data of measured temperature from the temperature detection module; The above-mentioned data processing program processes the collected data of measured temperature through guided mean filtering, and carries out adjustment process using minimum quadrature, The above-mentioned industrial transmission program outputs the processed data of measured temperature in the form of 4mA-20mA current; The above-mentioned data interface program transmits and receives data through the HART communication unit, and displays the data through the screen display unit; The above-mentioned temperature conversion program calculates the measured ambient temperature and the measured temperature on the pipe shell based on thermodynamic principles to obtain the temperature inside the pipeline. 11 A non-intrusive pipeline temperature measurement system for heavy oil extraction according to claim 1, characterized in that: The above master chip selects microcontroller STM32L011F4P6, the power module of the above hardware system operates with a current 4mA-20mA; The temperature measured by the above-mentioned temperature detection module is in the range of -40°C-350°C; the above-mentioned HART communication unit provides HART communication for the hardware system in accordance with the provisions and protocols for international HART application layer and data link layer. A non-intrusive pipeline temperature measurement system for heavy oil extraction according to claim 1, characterized in that: the above-mentioned software system is based on Keil uvision5 programming under Windows, using the C programming language. A non-intrusive heavy oil pipeline temperature measurement system according to claim 1, characterized in that: The above-mentioned temperature detection module selects chip AD7124-4 for temperature collection; while measuring temperature on the pipe shell, first configure the chip via MUX, then collect the data of temperature on the pipe shell via the temperature measuring element platinum resistance Pt100, then amplify the signal via PGA, and finally the measured analog is converted into digital values and is sent to the master chip; the aforementioned temperature collection unit measures the ambient temperature via a built-in temperature sensor. A non-intrusive heavy oil pipeline temperature measurement system according to claim 1, characterized in that: The above-mentioned HART communication unit selects AD5700 for the HART communication of the circuit; the above screen display unit is LCD screen and its driving chip is HT1621. 6. A non-intrusive heavy oil pipeline temperature measurement system according to claim 1, characterized in that: The isolated circuit converts the SV DC from the loop of the power module into AC via multivibrator, and is used to power the temperature sensing module after driving transformer by the square waves generated by multivibrator and rectifying the current to DC. 7. A non-intrusive heavy oil pipeline temperature measurement system according to claim 4, characterized in that: The main program of the above-mentioned 12 microcontroller controls the initialization of the master chip, the screen display unit, and the temperature collection chip. 8. A non-intrusive heavy oil pipeline temperature measurement system according to claim 4 characterized in that: The formula for calculating temperature within the pipeline by the above temperature conversion program is as follows: (4-44 Thereof, f is the ambient temperature measured by the temperature detection module, f2 is the temperature on the pipe shell measured by the temperature detection module, f: is the temperature inside the pipeline, A; is thermal conductivity of the ambient temperature, and has a value of thermal conductivity in air, 421s the thermal conductivity of the pipeline material, and its values are determined by the pipeline material, 511s the distance from the built-in temperature sensor to the pipe shell, 421s the length of the temperature measuring element Pt 100. 13