Ground acquisition system for temperature and pressure simultaneous measurement process of offshore heavy oil thermal production well

Abstract

The invention discloses a temperature and pressure simultaneous measurement process ground acquisition system for an offshore heavy oil thermal production well. The system comprises photoelectric composite temperature and pressure online ground demodulation equipment, an underground monitoring cable and a piezoresistive pressure sensor, the photoelectric composite temperature and pressure online ground demodulation equipment comprises a hardware acquisition system, a software demodulation system and a data transmission system. The hardware acquisition system comprises a power supply module, an amplifier module, an A / D conversion module, a single-chip microcomputer, a DC-DC voltage reduction module and a UART-to-RS485 communication module. On the basis of a distributed optical fiber testing technology and a piezoresistive pressure testing technology, a photoelectric technology and a photoelectric technology are combined, long-term and real-time online acquisition of underground full-well-section temperature and multi-point pressure of an offshore heavy oil thermal production well is achieved, the offshore thermal production working condition (370 DEG C / 26 Mpa) can be met, and the offshore heavy oil thermal production efficiency is improved. Long-term online acquisition of underground temperature and pressure parameters of each stage of the offshore heavy oil thermal production well is realized, and a technical basis is provided for parameter analysis and production system regulation and control of the offshore heavy oil thermal production well.

Description

Technical Field

[0001] The invention belongs to the technical field of offshore heavy oil thermal recovery, and in particular relates to a surface acquisition system for a temperature and pressure simultaneous measurement process of an offshore heavy oil thermal recovery well. Background Art

[0002] At present, the downhole high-temperature temperature and pressure monitoring technology for heavy oil thermal recovery in offshore oil fields is relatively simple, and the monitoring technology cannot perform long-term downhole monitoring, especially for pressure monitoring technology. Due to the complex working conditions of high temperature and high pressure during the heat injection period of thermal recovery wells, the existing pressure monitoring technology can only obtain the pressure data of a specified location in the well in a short period of time by inserting a test tool string through a steel wire or a continuous oil pipe. The data volume is limited, the operation procedure is complicated, and the operation safety risk is high. In addition, the data collected by the sensor are stored in the downhole equipment, and the ground cannot monitor the changes in the downhole pressure data in real time and online. In addition, the existing demodulation technology can only collect and display temperature and pressure separately, and cannot be integrated.

[0003] Therefore, a ground acquisition system with simultaneous temperature and pressure measurement technology for offshore heavy oil thermal production wells is required to meet the temperature and pressure monitoring needs of integrated injection and production conditions of thermal production wells in the Bohai Sea, realize real-time online and synchronous acquisition of temperature and multi-point pressure in the entire well section, and solve the technical limitations of existing acquisition technology with single monitoring parameters and inability to conduct real-time synchronous acquisition. Summary of the invention

[0004] The present invention is proposed to solve the problems existing in the prior art, and its purpose is to provide a surface acquisition system for the simultaneous temperature and pressure measurement process of offshore heavy oil thermal recovery wells.

[0005] The present invention is achieved through the following technical solutions:

[0006] A surface acquisition system for the simultaneous temperature and pressure measurement process of an offshore heavy oil thermal recovery well comprises an optoelectronic composite temperature and pressure online surface demodulation device, a downhole monitoring cable and a piezoresistive pressure sensor; the optoelectronic composite temperature and pressure online surface demodulation device comprises a hardware acquisition system, a software demodulation system and a data transmission system; the hardware acquisition system comprises a power supply module, an amplifier module, an A / D conversion module, a single-chip microcomputer, a DC-DC step-down module and a UART to RS485 communication module; the +5V and GND1 of the power supply module are respectively connected to the positive and negative electrodes of the power input terminal of the piezoresistive pressure sensor. The +5V and GND2 of the power supply module are respectively connected to the positive and negative poles of the power supply of the single-chip microcomputer, and the +5V power supply of the power supply module is connected to the single-chip microcomputer through the DC-DC step-down module; the +12V, -12V, and GND3 terminals of the power supply module are respectively connected to the amplifier module; the input terminal of the amplifier module is respectively connected to the output positive and negative terminals of the piezoresistive pressure sensor, and the output terminal of the amplifier module is connected to the A / D conversion module; the A / D conversion module is electrically connected to the single-chip microcomputer; the single-chip microcomputer is connected to the acquisition computer through the UART to RS485 communication module.

[0007] In the above technical solution, the A / D conversion module is built into the single chip microcomputer.

[0008] In the above technical solution, the software demodulation system adopts RS485 serial port communication to transmit the data processed by the single chip microcomputer 114 to the acquisition computer.

[0009] In the above technical solution, data transmission is realized between the distributed optical fiber temperature measurement host and the acquisition computer through the TCP / IP protocol, and the temperature data curve is drawn and displayed on the software demodulation system at the same time.

[0010] In the above technical solution, the data transmission system 13 is used to transmit the temperature data of the entire well section and the multi-point pressure data collected by the offshore field monitoring system to a land computer or mobile phone in real time, so as to view and download the well data in real time; the data transmission system 13 realizes the remote transmission of temperature and pressure data through the modbus protocol.

[0011] In the above technical solution, the downhole monitoring cable has four transmission wires and one temperature measuring tube built in; the four transmission wires are respectively the positive and negative ends of the input power supply and the positive and negative ends of the two piezoresistive pressure sensors.

[0012] In the above technical solution, the four transmission wires are used to provide a constant power supply for the silicon-titanium sapphire electronic pressure sensor and transmit the output voltage signal of the pressure sensor to the ground; the one temperature measuring tube is a temperature sensor and a temperature signal transmission medium, which is used to collect temperature data of the entire well section.

[0013] In the above technical solution, the piezoresistive pressure sensor and the downhole monitoring cable are connected by welding and mechanical sealing.

[0014] The beneficial effects of the present invention are:

[0015] The present invention provides a ground acquisition system for the simultaneous measurement of temperature and pressure of offshore heavy oil thermal recovery wells. The system is based on distributed optical fiber testing technology and piezoresistive pressure testing technology, and combines the two with photoelectric technology to achieve long-term, real-time online acquisition of temperature and multi-point pressure of all well sections of offshore heavy oil thermal recovery wells. At the same time, in view of the particularity of oil well testing, the centralized display of temperature and pressure data is achieved through the software demodulation system of the heavy oil thermal recovery well, and the supporting data transmission system realizes remote viewing and control of field data. The photoelectric composite temperature and pressure online monitoring system can meet the offshore thermal recovery working conditions (370℃ / 26Mpa), realize the long-term online acquisition of downhole temperature and pressure parameters of offshore heavy oil thermal recovery wells at various stages, and provide a technical basis for parameter analysis and production system control of offshore heavy oil thermal recovery wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention.

[0017] in:

[0018] 1. Photoelectric composite temperature and pressure online ground demodulation equipment;

[0019] 11. Hardware acquisition system; 111. Power supply module; 112. Amplifier module; 113. A / D conversion module; 114. Single chip microcomputer; 115. DC-DC step-down module; 116. UART to RS485 communication module;

[0020] 12. Software demodulation system;

[0021] 13. Data transmission system;

[0022] 2. Piezoresistive pressure sensor.

[0023] For ordinary technicians in this field, other relevant drawings can be obtained based on the above drawings without any creative work. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0025] like Figure 1 As shown, a surface acquisition system for simultaneous temperature and pressure measurement of offshore heavy oil thermal recovery wells includes an optoelectronic composite temperature and pressure online surface demodulation device, a downhole monitoring cable and a piezoresistive pressure sensor 2;

[0026] The photoelectric composite temperature and pressure online ground demodulation device 1 includes a hardware acquisition system 11, a software demodulation system 12 and a data transmission system 13;

[0027] The hardware acquisition system 11 includes a power supply module 111, an amplifier module 112, an A / D conversion module 113, a single-chip microcomputer 114, a DC-DC step-down module 115 and a UART to RS485 communication module 116;

[0028] The power supply module 111 provides a +12V constant voltage source and a +5V constant voltage source. The +12V constant voltage source of the power supply module 111 provides power excitation for the amplifier module 112, and the +5V constant voltage source provides power excitation for the piezoresistive pressure sensor 2. At the same time, the +5V constant voltage source reduces the +5V power supply to +3.3V after passing through the DC-DC step-down module 115 to provide power excitation for the single-chip microcomputer 114. The specific connection method is: the +5V and GND1 of the power supply module 111 are respectively connected to the positive and negative poles of the power input terminal of the piezoresistive pressure sensor 2, and the +5V and GND2 of the power supply module 111 are respectively connected to the positive and negative poles of the power supply of the single-chip microcomputer 114, and at the same time, the +5V power supply is reduced to +3.3V after passing through the DC-DC step-down module; the +12V, -12V, and GND3 terminals of the power supply module 111 are respectively connected to the amplifier module 112;

[0029] The power supply module 111 has the functions of voltage transformation, rectification, filtering and voltage stabilization, providing the system with stable DC voltage to ensure the stable operation of the test system; the power supply module also provides 5V DC voltage for the piezoresistive pressure sensor, 12V DC voltage for the amplifier module and 3.3V DC voltage for the single-chip microcomputer;

[0030] The model of the power supply module is JEC50-220T05&12-J;

[0031] The input end of the amplifier module 112 is respectively connected to the positive and negative output ends of the piezoresistive pressure sensor 2 to receive the output voltage of the pressure sensor due to the change in the resistance of the Wheatstone bridge. The output end of the amplifier module 112 is connected to the A / D conversion module 113 to transmit the amplified voltage signal to the A / D conversion module 113.

[0032] The amplifier module 112 amplifies the original voltage signal returned by the piezoresistive pressure sensor 2, so that the A / D conversion module 113 can perform analog-to-digital processing conversion more accurately;

[0033] The model of the amplifier module 112 is KDTSOP8AMP;

[0034] The A / D conversion module 113 is built into the single-chip microcomputer 114, and converts the analog voltage signal of the piezoresistive pressure sensor 2 amplified by the amplifier module 112 into a digital signal that can be recognized by the single-chip microcomputer 114;

[0035] The A / D conversion module 113 has an analog-to-digital conversion function. The voltage signal returned by the piezoresistive pressure sensor 2 is an analog signal. Since the single-chip microcomputer 114 can only process digital signals, the A / D conversion module 113 discretizes a certain range of analog signals returned by the piezoresistive pressure sensor 2 into digital signals for the single-chip microcomputer 114 to perform the next step of data processing.

[0036] The model of the A / D conversion module 113 is ADC0809;

[0037] The pins of the single chip microcomputer 114 are respectively connected to the amplifier circuit module 112 and the DC-DC buck module 115, and are also connected to the UART to RS485 communication module 116, and are connected to the acquisition computer through the UART to RS485 communication module 116.

[0038] The single-chip microcomputer 114 has a central processing unit CPU, a memory RAM, a ROM, a parallel I / O port, a serial I / O port, a timer / counter, an interrupt system, a system clock circuit and a system bus; after receiving the digital signal transmitted by the A / D conversion module 113, the single-chip microcomputer 114 processes it according to the solidified parameters and outputs it through the liquid crystal display;

[0039] The model of the single chip microcomputer 114 is STM32F407; the model of the RS485 communication module 116 is TTL RS485; the DC-DC step-down module 115 has the function of stepping down the 5V constant voltage power provided by the power supply module, converting it into 3.3V and then providing it to the single chip microcomputer 114;

[0040] The UART to RS485 communication module 116 realizes the conversion between serial communication and 485 bus communication, and sends the control instructions from the single chip microcomputer 114 to the acquisition computer;

[0041] The software demodulation system 12 uses RS485 serial communication to transmit the data processed by the single-chip microcomputer 114 to the acquisition computer, and obtains the downhole pressure data after the high-order least squares fitting operation of the software demodulation system. After filtering and storage, the pressure data is drawn into a two-dimensional curve for display; in addition, the distributed optical fiber temperature measurement host and the acquisition computer realize data transmission through the TCP / IP protocol, and the temperature data curve is drawn and displayed on the software demodulation system 12 at the same time. The model of the distributed optical fiber temperature measurement host is N4385B;

[0042] The software demodulation system has the functions of collection, filtering, calibration, storage, display and specific functions for oil well testing; the software demodulation system integrates the temperature data of the entire well section collected by the distributed optical fiber temperature measurement system and the multi-point pressure data collected by the piezoresistive pressure sensor into a set of demodulation software for display, and has a pressure calibration function module, a temperature self-calibration module, a filtering function, etc., which can verify the pressure measurement accuracy of the piezoresistive pressure sensor and eliminate the pressure drift caused by temperature change. It is also equipped with a filtering function to average the pressure data measured by the piezoresistive pressure sensor in the time domain and space domain to improve the pressure measurement accuracy of the system;

[0043] The software demodulation system is a software system installed on the acquisition computer, and the model of the software demodulation system is CYRC23PP350;

[0044] The data transmission system 13 is used to transmit the temperature data of the entire well section and the multi-point pressure data collected by the offshore field monitoring system to a land computer or mobile phone in real time, so as to view and download the well data in real time; the data transmission system 13 realizes the remote transmission of the temperature and pressure data with the collection computer through the modbus protocol; the model of the data transmission system 13 is NCCZX20T;

[0045] The downhole monitoring cable is composed of 4 transmission wires and 1 temperature measuring tube. The 4 transmission wires are respectively the positive and negative terminals of the input power supply of 2 piezoresistive pressure sensors and +2 positive and negative terminals of the output voltage;

[0046] The transmission wires of the positive and negative ends of the input power of the two piezoresistive pressure sensors are connected between the piezoresistive pressure sensor 2 and the power supply module 111, and the positive and negative ends of the two output voltages are connected between the piezoresistive pressure sensor 2 and the amplifier module 112; the one temperature measuring tube is a sensor of the distributed optical fiber temperature measuring system, and the maximum temperature resistance is 370°C;

[0047] The downhole monitoring cable is composed of two parts: a circuit and an optical path. The circuit part is mainly used to provide a constant power supply for the silicon-titanium sapphire electronic pressure sensor and transmit the output voltage signal of the pressure sensor to the ground. The optical path part is both a temperature sensor and a temperature signal transmission medium, and is used to collect temperature data of the entire well section.

[0048] The piezoresistive pressure sensor 2 is connected to the downhole monitoring cable by welding and mechanical sealing. The piezoresistive pressure sensor 2 adopts the Wheatstone bridge principle. When the external medium acts on the pressure-sensitive diaphragm of the pressure sensor, the resistance of the variable resistor in the Wheatstone bridge changes, thereby causing the output voltage of the pressure sensor to change. The output voltage is demodulated by the ground demodulation equipment to achieve the measurement of the downhole pressure.

[0049] The working principle of the present invention is:

[0050] The present invention combines distributed optical fiber temperature measurement technology with piezoresistive pressure measurement technology, and innovatively designs a ground acquisition system for the simultaneous temperature and pressure measurement process of offshore heavy oil thermal recovery wells. The demodulation equipment is compatible with the optoelectronic composite testing technology, and realizes the long-term, real-time online acquisition of the temperature and multi-point pressure of the entire well section of the offshore heavy oil thermal recovery well. In view of the particularity of oil well testing, a software demodulation system is developed, which integrates the functions of calibration, temperature self-compensation, filtering, and real-time display of curves, and realizes the centralized display of temperature and pressure data. At the same time, the supporting data transmission system realizes the remote viewing and control of field data. The optoelectronic composite temperature and pressure online ground demodulation equipment, the downhole monitoring cable, and the piezoresistive pressure sensor constitute a set of optoelectronic composite temperature and pressure online monitoring systems that meet the field conditions (370℃ / 26Mpa), realize the long-term online acquisition of the downhole temperature and pressure parameters of the offshore heavy oil thermal recovery wells at various stages, and provide a technical basis for the parameter analysis and production system control of offshore heavy oil thermal recovery wells.

[0051] Based on the fact that the existing monitoring technology of offshore heavy oil thermal recovery wells cannot realize the long-term, real-time online collection of temperature and multi-point pressure of the entire well section, and the current ground demodulation equipment is not compatible with the optoelectronic composite testing system to realize the centralized display of temperature and pressure data, the present invention innovatively designs a ground collection system for the simultaneous measurement of temperature and pressure of offshore heavy oil thermal recovery wells, based on distributed optical fiber testing technology and piezoresistive pressure testing technology, and innovatively combines the two technologies, and is equipped with downhole monitoring cables and piezoresistive pressure sensors to form a set of optoelectronic composite temperature and pressure online monitoring systems that meet the field conditions (370℃ / 26Mpa), realizing the long-term online collection of downhole temperature and pressure parameters of offshore heavy oil thermal recovery wells at various stages, and providing a technical basis for parameter analysis and production system regulation of offshore heavy oil thermal recovery wells.

[0052] The photoelectric composite temperature and pressure online ground acquisition equipment of the present invention innovatively designs a photoelectric composite monitoring system that integrates distributed optical fiber temperature measurement and multi-point piezoresistive pressure measurement, demodulation, display, and storage, and is equipped with downhole photoelectric composite monitoring cables and piezoresistive pressure sensors to form a set of offshore heavy oil thermal recovery well temperature and pressure simultaneous measurement technology. It solves the problem that the existing monitoring technology cannot achieve long-term and real-time monitoring of downhole temperature and pressure parameters in heavy oil thermal recovery wells. At the same time, it is equipped with a data remote transmission system to achieve long-term, real-time, and synchronous acquisition and transmission of temperature and multi-point pressure data of the entire downhole section of heavy oil thermal recovery wells.

[0053] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A surface data acquisition system for simultaneous temperature and pressure measurement of offshore heavy oil thermal recovery wells, characterized by: It includes an optoelectronic composite temperature and pressure online ground demodulation device, a downhole monitoring cable and a piezoresistive pressure sensor (2); The photoelectric composite temperature and pressure online ground demodulation device (1) comprises a hardware acquisition system (11), a software demodulation system (12) and a data transmission system (13); The hardware acquisition system (11) comprises a power supply module (111), an amplifier module (112), an A / D conversion module (113), a single chip computer (114), a DC-DC step-down module (115) and a UART to RS485 communication module (116); The +5V and GND1 of the power supply module (111) are respectively connected to the positive and negative poles of the power input terminal of the piezoresistive pressure sensor (2); the +5V and GND2 of the power supply module (111) are respectively connected to the positive and negative poles of the power supply of the single-chip computer (114); the +5V power supply of the power supply module (111) is connected to the single-chip computer (114) via a DC-DC step-down module (115); the +12V, -12V and GND3 terminals of the power supply module (111) are respectively connected to the amplifier module (112); The input end of the amplifier module (112) is respectively connected to the positive and negative output ends of the piezoresistive pressure sensor (2), and the output end of the amplifier module (112) is connected to the A / D conversion module (113); The A / D conversion module (113) is electrically connected to the single chip computer (114); The single chip microcomputer (114) is connected to the collection computer via a UART to RS485 communication module (116).

2. The surface data acquisition system for the temperature and pressure simultaneous measurement process of offshore heavy oil thermal recovery wells according to claim 1, characterized in that: The A / D conversion module (113) is built into the single chip computer (114).

3. The surface data acquisition system for the temperature and pressure simultaneous measurement process of offshore heavy oil thermal recovery wells according to claim 1 is characterized by: The software demodulation system (12) uses RS485 serial port communication to transmit the data processed by the single chip microcomputer 114 to the acquisition computer.

4. The surface data acquisition system for the simultaneous temperature and pressure measurement process of offshore heavy oil thermal recovery wells according to claim 1, characterized in that: The distributed optical fiber temperature measurement host and the collection computer realize data transmission through the TCP / IP protocol, and the temperature data curve is drawn and displayed on the software demodulation system (12) at the same time.

5. The surface data acquisition system for the simultaneous temperature and pressure measurement process of offshore heavy oil thermal recovery wells according to claim 1, characterized in that: The data transmission system (13) is used to transmit the temperature data of the entire well section and the multi-point pressure data collected by the offshore field monitoring system to a land computer or mobile phone in real time, so as to view and download the well data in real time; The data transmission system (13) realizes remote transmission of temperature and pressure data with the collection computer through the modbus protocol.

6. The surface data acquisition system for the simultaneous temperature and pressure measurement process of offshore heavy oil thermal recovery wells according to claim 1, characterized in that: The downhole monitoring cable has four transmission wires and one temperature measuring tube built in; the four transmission wires are respectively the positive and negative ends of the input power supply of two piezoresistive pressure sensors and the positive and negative ends of two output voltages.

7. The surface data acquisition system for the simultaneous temperature and pressure measurement process of offshore heavy oil thermal recovery wells according to claim 6, characterized in that: The four transmission wires are used to provide a constant power supply for the silicon-titanium sapphire electronic pressure sensor and transmit the output voltage signal of the pressure sensor to the ground; the one temperature measuring tube is a temperature sensor and a temperature signal transmission medium, and is used to collect temperature data of the entire well section.

8. The surface data acquisition system for simultaneous temperature and pressure measurement of offshore heavy oil thermal recovery wells according to claim 1, characterized in that: The piezoresistive pressure sensor (2) is connected to the downhole monitoring cable by welding and mechanical sealing.

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