System and method for testing temperature profile of steam injection heavy oil well
The temperature profile testing system for steam-injected heavy oil wells, using multi-core steel pipe cables and a unique connection method, solves the problems of high cost and insufficient accuracy of existing equipment, achieving real-time monitoring and high-precision testing, and reducing hardware costs.
Patent Information
- Application Number
- CN202511167223.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-20
- Publication Date
- 2025-11-25
AI Technical Summary
Existing equipment for testing temperature profiles in steam-injected heavy oil wells is costly and lacks sufficient accuracy. In particular, fiber optic temperature measurement is expensive, thermocouple methods are complex to manufacture, and conventional platinum resistance methods have high costs due to the large number of cable cores.
Employing multi-core steel conduit cables and a unique cable core splicing method, combined with Class A PT1000 platinum resistance thermometers and high-temperature inorganic adhesives, and through a unique connection method between the cable cores and the ground monitoring instrument, it integrates real-time monitoring, network remote transmission, and cable withstand voltage functions, reducing hardware costs and improving testing accuracy.
It enables real-time monitoring and high-precision testing of temperature profiles in steam-injected heavy oil wells, while significantly reducing system hardware costs and saving on cable core quantity and material costs.
Smart Images
Figure CN121007650A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a temperature profile testing system and method for steam-injected heavy oil wells, belonging to the field of oil well testing technology. Background Technology
[0002] Steam injection in heavy oil wells is a common method in oil extraction, applied in oilfields such as Xinjiang and Liaohe in my country. To determine the steam absorption / production profile of the oil reservoir and optimize the injection-production regime, it is necessary to test the temperature profile of heavy oil wells. Current methods for testing the temperature profile of steam-injected heavy oil wells mainly include those based on platinum resistance thermometers (PTTs) and thermocouples, as well as fiber optic temperature measurement. However, fiber optic temperature measurement equipment is expensive; thermocouple methods require different conductor materials, making cable core fabrication inconvenient; and the conventional three-wire platinum resistance thermometry method connects each PTT to three independent cable cores, which can offset the impact of resistance variations in long cable cores on measurement accuracy, but the cost of high-temperature cable cores remains high.
[0003] In view of the above situation, it is necessary to develop a temperature profile testing system and method for steam-injected heavy oil wells, so that in addition to the real-time monitoring function of temperature profile of steam-injected heavy oil wells, it can also improve the temperature testing accuracy and reduce the equipment hardware cost. Summary of the Invention
[0004] The purpose of this invention is to provide a temperature profile testing system and method for steam-injected heavy oil wells. By integrating multiple functions such as temperature profile testing, long-term real-time monitoring, network transmission, and cable withstand voltage protection into the system, and utilizing a unique connection method between the cable core and the ground monitoring instrument, the system improves temperature testing accuracy and reduces hardware costs.
[0005] The technical solution of this invention: A temperature profile testing system for steam-injected heavy oil wells, the system comprising a ground monitoring instrument installed at the wellhead of the steam-injected heavy oil well and a multi-core steel pipe cable that can extend into the steam-injected heavy oil well. The ground monitoring instrument includes a ground enclosure, which houses a surge protector, a residual current device (RCD), a circuit breaker group, a switch, an AC-DC power module, an industrial integrated machine, a temperature transmitter board, and a relay module. The surge protector is connected to both an external power source and the RCD. The RCD is connected to both the switch and the AC-DC power module via the circuit breaker group. The switch is connected to the industrial integrated machine. The AC-DC power module supplies power to the industrial integrated machine and the temperature transmitter board. The transmitter board and relay module are powered, and the industrial integrated machine, temperature transmitter board, and relay module are interconnected. Temperature profile testing software is installed in the industrial integrated machine. The multi-core steel pipe cable includes a steel pipe shell, several cable cores, and several temperature sensing components. The several cable cores inside the steel pipe shell include two common cable cores. One end of the two common cable cores is directly connected to the temperature transmitter board. The bottom end of each of the remaining cable cores is connected to a temperature sensing component, and the top end of each component is connected to the corresponding terminal of a different channel of the relay module. Each temperature sensing component is arranged at a different predetermined length position. The several cable cores are connected at the bottom of the multi-core steel pipe cable to form a common electrical node.
[0006] In the aforementioned steam injection heavy oil well temperature profile testing system, the steel pipe outer shell of the multi-core steel pipe cable is made of 316L steel with a wall thickness ≥2mm and a pressure resistance ≥25MPa; the bottom of the steel pipe outer shell is sealed by a cable end cap.
[0007] In the aforementioned steam injection heavy oil well temperature profile testing system, the cable core conductor is made of nickel-plated copper wire and is insulated with mica.
[0008] In the aforementioned temperature profile testing system for steam-injected heavy oil wells, the temperature sensing component includes a Class A PT1000 platinum resistance thermometer, a protective shell, and a high-temperature inorganic adhesive.
[0009] A method for testing the temperature profile of a steam-injected heavy oil well, wherein the method is based on the steam-injected heavy oil well temperature profile testing system described above, specifically: the temperature profile testing software in the industrial all-in-one machine controls the relay module through the serial port of the industrial all-in-one machine, closing only one channel at a time while opening the other channels. The closed channel connects the corresponding cable core electrical characteristics to the temperature transmitter board. The temperature profile testing software controls the temperature transmitter board to collect temperature signals through the serial port of the industrial all-in-one machine until all temperature channels have been tested. The temperature profile testing software then sends the current temperature data of all channels to the mobile network device via the network port through a switch.
[0010] In the aforementioned method for testing the temperature profile of a steam-injected heavy oil well, during the test, the temperature profile testing software controls the temperature transmitter board through the serial port of the industrial all-in-one machine to collect temperature signals and displays the temperature values in real time on the touch screen of the industrial all-in-one machine.
[0011] The beneficial effects of the present invention are as follows: Compared with the prior art, the system and method of the present invention integrate multiple functions such as steam injection heavy oil well temperature profile testing, long-term real-time monitoring, network remote transmission, and cable withstand voltage protection into the system. At the same time, the unique connection method between the cable core and the ground monitoring instrument improves the temperature testing accuracy and significantly reduces the system hardware cost.
[0012] In the system of this invention, the temperature transmitter board uses a 3-wire system to test the resistance value of the platinum resistance temperature sensor component. The 3 wires consist of 2 common cable cores and 1 cable core connected through a closed channel of a relay module. The total number of cable cores required by this structure and method is 2 + the number of platinum resistances, n. Compared to the conventional 3-wire platinum resistance temperature measurement method, which requires 3n cable cores to connect each platinum resistance to 3 independent cable cores, the 3-wire temperature measurement can compensate for the resistance effects of cable core changes with temperature and length. Furthermore, for the commonly used 8-12 temperature points, 14-22 cable cores can be saved. The cost of each high-temperature cable core is approximately 5-7 yuan / meter, and the cable core length is typically 500-1000 meters, thus significantly reducing the system hardware cost. Attached Figure Description
[0013] Figure 1 This is a system composition block diagram of the present invention;
[0014] Figure 2 This is a system workflow diagram of the present invention. Detailed Implementation
[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.
[0016] An embodiment of the present invention: a temperature profile testing system for steam-injected heavy oil wells, the system comprising a ground monitoring instrument installed at the wellhead of the steam-injected heavy oil well and a multi-core steel pipe cable that can extend into the steam-injected heavy oil well.
[0017] As attached Figure 1As shown, the ground monitoring instrument includes a ground enclosure, which houses a surge protector, a residual current device (RCD), a circuit breaker group, a switch, an AC-DC power module, an industrial integrated machine, a temperature transmitter board, and a relay module (single-pole single-throw type). The surge protector is connected to both the external power supply and the RCD. The external AC 220V power supply powers the ground monitoring instrument. The RCD is connected to both the switch and the AC-DC power module via the circuit breaker group. The switch is connected to the network port of the industrial integrated machine and also to an external network bridge. The AC-DC power module powers the industrial integrated machine, the temperature transmitter board, and the relay module. Specifically, the AC-DC power module is divided into a DC 12V power module and a DC 24V power module. The DC 12V power module powers the industrial integrated machine, while the DC 24V power module powers the temperature transmitter board and the relay module. The industrial integrated machine, temperature transmitter board, and relay module are interconnected. The industrial integrated machine contains temperature profile testing software.
[0018] The multi-core steel conduit cable includes a steel conduit shell, several cable cores, and several temperature sensing components. Inside the steel conduit shell, the cable cores include two common cores, the tops of which are directly connected to the terminals of the temperature transmitter board. These two common cores serve as a common current path and are not directly connected to the temperature sensing components. Each of the remaining cable cores has a temperature sensing component connected to its bottom, and the top of each cable core is connected to the terminals corresponding to different channels of a relay module. Each temperature sensing component is positioned at a predetermined length, and the cable length is determined according to the required depth of the cable in the well. The cable cores are laser-welded or current-welded together at the bottom of the multi-core steel conduit cable to form a common electrical node.
[0019] Laser welding is used at the connection between the cable core and the temperature sensing component.
[0020] The steel pipe outer shell of the multi-core steel pipe cable is made of 316L steel with a wall thickness of ≥2mm and a pressure resistance of ≥25MPa. The bottom of the steel pipe outer shell is brazed to the end cap of the cable to ensure a seal.
[0021] The cable core conductor is made of nickel-plated copper wire and is insulated with mica, which enables the cable core to withstand high temperatures up to 350°C for a long time, meeting the temperature requirements for steam injection in heavy oil wells in oil fields.
[0022] The temperature sensing component includes a Class A PT1000 platinum resistance thermometer, a protective shell, and a high-temperature inorganic adhesive, enabling it to withstand long-term high temperatures up to 350°C, meeting the temperature requirements for steam injection in heavy oil wells in oil fields.
[0023] A method for testing the temperature profile of a steam-injected heavy oil well, the method being based on the steam-injected heavy oil well temperature profile testing system of the present invention, specifically including the following steps:
[0024] Step 1: The temperature profile testing software in the industrial all-in-one machine controls the relay module through the 485 serial port in the industrial all-in-one machine. At the same time, it closes only one channel and opens the other channels. The closed loop formed by the closed channel can connect the corresponding cable core electrical characteristics to the temperature transmitter board.
[0025] Step 2: The temperature profile testing software controls the temperature transmitter board in the industrial all-in-one machine to collect the temperature signal of the closed channel through the 485 serial port and displays the temperature value in real time on the touch screen of the industrial all-in-one machine.
[0026] Step 3: Repeat steps 1 and 2 until all channel temperatures are tested. The temperature profile testing software sends the current temperature data of all channels to the switch through the network port, and at the same time sends it to the mobile network device for further processing through the switch.
Claims
1. A temperature profile testing system for steam-injected heavy oil wells, characterized in that: The system includes a surface monitoring instrument installed at the wellhead of a steam-injected heavy oil well and a multi-core steel cable that can extend into the well. The surface monitoring instrument includes a surface enclosure housing a surge protector, a residual current device (RCD), a circuit breaker group, a switch, an AC-DC power module, an industrial integrated machine, a temperature transmitter board, and a relay module. The surge protector is connected to both an external power source and an RCD. The RCD is connected to both the switch and the AC-DC power module via the circuit breaker group. The switch is connected to the industrial integrated machine. The AC-DC power module supplies power to the industrial integrated machine, the temperature transmitter board, and the relay module. The industrial integrated machine, temperature transmitter board, and relay module are interconnected. Temperature profile testing software is installed in the industrial integrated machine. The multi-core steel pipe cable includes a steel pipe shell, several cable cores, and several temperature sensing components. The several cable cores inside the steel pipe shell include two common cable cores. One end of the two common cable cores is directly connected to the temperature transmitter board. The bottom end of each of the remaining cable cores is connected to a temperature sensing component, and the top end of each component is connected to the corresponding terminal of a different channel of the relay module. Each temperature sensing component is arranged at a different predetermined length position. The several cable cores are connected at the bottom of the multi-core steel pipe cable to form a common electrical node.
2. The temperature profile testing system for steam-injected heavy oil wells according to claim 1, characterized in that: The steel pipe outer shell of the multi-core steel pipe cable is made of 316L steel with a wall thickness of ≥2mm and a pressure resistance of ≥25MPa; the bottom of the steel pipe outer shell is sealed by a cable end cap.
3. The temperature profile testing system for steam-injected heavy oil wells according to claim 1, characterized in that: The cable core conductor is made of nickel-plated copper wire and is insulated with mica.
4. The temperature profile testing system for steam-injected heavy oil wells according to claim 1, characterized in that: The temperature sensing component includes a Class A PT1000 platinum resistance thermometer, a protective housing, and a high-temperature inorganic adhesive.
5. A method for testing temperature profiles in steam-injected heavy oil wells, characterized in that: The test method is performed based on the steam injection heavy oil well temperature profile test system described in any one of claims 1-4. Specifically, the temperature profile test software in the industrial all-in-one machine controls the relay module through the serial port of the industrial all-in-one machine, closing only one channel at a time while opening other channels. The closed channel connects the corresponding cable core electrical characteristics to the temperature transmitter board. The temperature profile test software controls the temperature transmitter board to collect temperature signals through the serial port of the industrial all-in-one machine until all temperature channels are tested. The temperature profile test software then sends the current temperature data of all channels to the mobile network device via the network port through the switch.
6. The method for testing temperature profiles in steam-injected heavy oil wells according to claim 5, characterized in that: During the test, the temperature profile testing software controls the temperature transmitter board through the serial port of the industrial all-in-one machine to collect temperature signals and displays the temperature values in real time on the touch screen of the industrial all-in-one machine.