SAGD underground long-term pressure monitoring device
By designing a long-term pressure monitoring device for SAGD underground, the problem of the existing technology being difficult to measure pressure in high temperature and high pressure environments for a long time is solved, and high-precision pressure monitoring and real-time data management are realized in the underground water, providing dynamic reservoir evaluation and production optimization. Reliable data support.
Patent Information
- Application Number
- CN202420584615.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-25
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2034-03-25
AI Technical Summary
The prior art is difficult to measure the steam parameters of high temperature and high pressure in the SAGD hole for a long time, resulting in no long-term pressure measurement data under the heavy oil thermal production hole.
A SAGD downhole long-term pressure monitoring device is designed, including a pressure inlet plug, a pressure sensor and a ground signal control instrument. The device monitors downhole pressure changes in real time through pressure sensors, and transmits data to the ground signal control instrument through capillary cables. It uses the signal separation main control circuit to separate and preprocess signals, real-time monitoring and management of data.
It realizes long-term high-precision pressure monitoring in SAGD underground, ensures data accuracy and real-time performance, and provides reliable pressure data support for reservoir dynamic assessment and production optimization.
Smart Images
Figure CN222526283U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of pressure measuring devices, in particular to a high-temperature downhole pressure measuring device. Background Art
[0002] As the main replacement technology after heavy oil steam stimulation, SAGD technology has achieved substantial results in the pilot test of super-heavy oil conversion mining mode in Liaohe Oilfield and Xinjiang Oilfield. In order to ensure the development effect of SAGD, high-dryness steam (70% steam dryness at the bottom of the well) must be used in the steam injection process to meet production needs. In the SAGD well area of Xinjiang Oilfield, superheated steam injection boilers are used for steam injection operations. The state of superheated steam depends on two parameters: pressure and temperature. The superheated steam temperature reaches 340-360℃ and the pressure is 15-20MPa. Under normal circumstances, the pressure of superheated steam boiler wet saturated steam entering the steam injection pipeline through the separator is 17.5Mpa, the temperature is 353℃, and the dryness is nearly 100%. Excluding the heat loss along the way, the steam dryness at the bottom of the well is about 70%-80%. The rated operating temperature of the ground steam injection pipeline and the thermal recovery wellhead device is 370℃ and the rated working pressure is 30MPa. For steam injection wells with temperatures as high as 350°C and pressures as high as 20MPa, how to measure these parameters poses a severe challenge to the measuring instruments. Currently, various pressure measuring devices have been field tested in SAGD wells, but none of them can meet the needs of high-temperature and long-term pressure measurement in SAGD and VHSD wells, resulting in no long-term pressure measurement data in heavy oil thermal recovery wells, and the downhole phase state can only be judged based on experience. How to understand the dynamic changes in temperature and pressure in SAGD and VHSD wells and provide a basis for on-site production decisions is becoming increasingly important for the scientific development of heavy oil blocks.
[0003] In summary, the utility model provides a SAGD downhole long-term pressure monitoring device to solve the above problems. Utility Model Content
[0004] In order to solve the above technical problems, the utility model provides a SAGD downhole long-term pressure monitoring device to overcome the defects and shortcomings of the prior art.
[0005] The technical scheme of the utility model is as follows: a SAGD downhole long-term pressure monitoring device, comprising: a pressure inlet plug and a pressure sensor, one end of the pressure inlet plug is threadedly connected with a pressure joint, the pressure joint is welded to a sensor welding seat on the side away from the pressure inlet plug, the end of the pressure sensor is welded to the middle part of the side of the sensor welding seat away from the pressure joint, the sensor welding seat is welded to the outer periphery of the same side where the pressure sensor is connected, the pressure joint, the sensor welding seat and the outer tube are all made of TC4, and the outer tube is away from the sensor welding seat. The end is connected with outer tube 2, the material of outer tube 2 is 316L, and the end of outer tube 2 extends into outer tube 1, the middle part of outer tube 2 is provided with a tightening cap, the end of tightening cap away from outer tube 2 is provided with a conical ring, the upper end of tightening cap is fixedly connected with an upper joint, and the upper joint wraps around one-third of the upper end of the tightening cap, the conical ring is also fixedly connected with the upper joint and wrapped by the upper joint, the end of the upper joint away from the tightening cap is welded with a protective tube, the middle part of the upper joint is fixedly connected with a wire passing tube, and the wire passing tube passes through the upper joint and extends out of the tightening cap.
[0006] Furthermore, the pressure sensor is electrically connected to a terminal, the terminal is electrically connected to a transmission line, the transmission line is electrically connected to a capillary cable, and the capillary cable is electrically connected to a ground signal control instrument.
[0007] Furthermore, the capillary cable transmits the pressure signal collected downhole to a surface signal control instrument, and the surface signal control instrument includes an AC power supply.
[0008] Furthermore, the AC power supply includes a system power supply and a sensor power supply, the system power supply is connected to the sensor power supply, and the system power supply is electrically connected to a signal separation main control circuit.
[0009] Furthermore, the signal separation main control circuit is responsible for the coordination and control of the overall system, and is used to effectively separate and pre-process the multiple signals compounded in the pressure signal capillary cable.
[0010] Furthermore, the signal separation main control circuit includes a sensor controller, a data backup unit, a signal processing unit, a 4G transmission module and a human-computer interaction unit, and the sensor controller is electrically connected to the sensor power supply and the signal processing unit at the same time.
[0011] Furthermore, the signal processing unit is used to accurately analyze and convert the separated pressure signal, and also includes data communication and backup, and can transmit data to the server side through the 4G module in real time to achieve remote monitoring and management.
[0012] Furthermore, the data backup unit is used to completely save the downhole pressure change information in the event of network disconnection or network instability, so as to ensure data security and continuity.
[0013] Furthermore, the human-computer interaction unit can calibrate the pressure measurement values through the control algorithm, and can perform real-time calibration processing on the pressure measurement values measured downhole to eliminate the influence of environmental factors and ensure the accuracy of the data, thereby providing accurate and reliable pressure data support for dynamic evaluation of oil reservoirs and production optimization.
[0014] Compared with the prior art, the utility model has the following beneficial effects:
[0015] 1. The utility model transmits the monitored pressure change to the pressure signal capillary cable in the pressure signal transmission line through the pressure sensor via the pressure signal terminal, and the pressure signal capillary cable transmits the pressure signal collected downhole to the ground signal control instrument; because the ground signal control instrument is for ground visual monitoring, high real-time performance, and long-term operation, a more targeted scheme design is made in terms of system circuit stability and software robustness; the sensor power supply uses a power module with high stability, and the pressure sensor and the ground signal control instrument are connected by a multi-core cable. In order to solve the influence of the cable on the system signal transmission, an automatically controlled current source design is adopted in the design, and a high-precision instrument amplifier circuit is adopted in the signal sampling design, which greatly improves the amplification and collection requirements of tiny signals and fundamentally improves the accuracy of the system.
[0016] 2. The utility model effectively separates and pre-processes the various signals compounded in the pressure signal capillary cable through the signal separation main control circuit in the ground signal control instrument, and coordinates and controls the overall system; at the same time, in the case of network disconnection or network instability, the data backup unit can still completely save the pressure change information downhole to ensure data security and continuity. When connected to a computer, the data can also be transmitted to the signal data processing software to complete data recording and analysis.
[0017] 3. The utility model uses the signal separation main control circuit to accurately analyze and convert the separated pressure signal through the signal processing unit, and can transmit the data to the server-side human-computer interaction unit through the 4G transmission module to achieve remote monitoring and management. The transmission method between the 4G transmission module and the signal separation main control circuit is the MODBUS transmission protocol based on the 485 bus, which can effectively reduce the impact of external interference sources on the system in a complex electric field environment, and also improve the versatility of the equipment; the human-computer interaction unit can calibrate the pressure measurement value through the control algorithm, and can perform real-time calibration processing on the pressure measurement value measured downhole to eliminate the influence of environmental factors and ensure the accuracy of the data, thereby providing accurate and reliable pressure data support for dynamic reservoir evaluation and production optimization; the device is compact and lightweight in structure design, and is easy to install at different positions in the wellbore to achieve monitoring of pressure points at different depths. At the same time, it can be used in parallel with multi-point thermocouple temperature measurement, and the ground can be visually monitored synchronously with high real-time performance. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a three-dimensional diagram of the device of the utility model;
[0019] Figure 2 It is a structural schematic diagram of the device of the utility model;
[0020] Figure 3 This is a schematic diagram of the connection between the outer tube 1 and the outer tube 2 of the device of the utility model;
[0021] Figure 4 It is a schematic diagram of signal transmission of the utility model device.
[0022] In the figure:
[0023] 1. Pressure inlet plug; 2. Pressure joint; 3. Sensor welding seat; 4. Pressure sensor; 5. Outer tube one; 6. Outer tube two; 7. Tightening cap; 8. Conical ring; 9. Upper joint; 10. Protective tube; 11. Wire tube; 12. Terminal; 13. Transmission line; 14. Capillary cable; 15. Ground signal control instrument; 16. Signal separation main control circuit; 17. Sensor controller; 18. Signal processing unit; 19. Data backup unit; 20. 4G transmission module; 21. Human-computer interaction unit; 22. System power supply; 23. Sensor power supply; 24. AC power supply. DETAILED DESCRIPTION
[0024] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.
[0025] like Figure 1-4As shown, the utility model provides a SAGD downhole long-term pressure monitoring device, including: a pressure inlet plug 1 and a pressure sensor 4, one end of the pressure inlet plug 1 is threadedly connected with a pressure joint 2, the pressure joint 2 is welded to a sensor welding seat 3 on a side away from the pressure inlet plug 1, the end of the pressure sensor 4 is welded to the middle part of the side of the sensor welding seat 3 away from the pressure joint 2, the sensor welding seat 3 is welded to an outer tube 5 on the periphery of the same side where the pressure sensor 4 is connected, the pressure joint 2, the sensor welding seat 3 and the outer tube 5 are all made of TC4, which effectively improves the wear resistance, and the outer tube 5 is connected to an outer tube 2 on the end away from the sensor welding seat 3 6. The material of the outer tube 2 6 is 316L, which improves the corrosion resistance of the device, and the end of the outer tube 2 6 extends into the outer tube 1 5. A tightening cap 7 is provided in the middle of the outer tube 2 6, and a conical ring 8 is provided at the end of the tightening cap 7 away from the outer tube 2 6. The upper end of the tightening cap 7 is fixedly connected with an upper joint 9, and the upper joint 9 wraps around one-third of the upper end of the tightening cap 7. The conical ring 8 is also fixedly connected to the upper joint 9 and wrapped by the upper joint 9. A protective tube 10 is welded to the end of the upper joint 9 away from the tightening cap 7, and a wire passing tube 11 is fixedly connected to the middle part of the upper joint 9, and the wire passing tube 11 passes through the upper joint 9 and extends out of the tightening cap 7.
[0026] As an implementation mode of the utility model, the pressure sensor 4 is electrically connected to a terminal 12 , the terminal 12 is electrically connected to a transmission line 13 , the transmission line 13 is electrically connected to a capillary cable 14 , and the capillary cable 14 is electrically connected to a ground signal control instrument 15 .
[0027] As an implementation mode of the utility model, the capillary cable 14 transmits the pressure signal collected downhole to the surface signal control instrument 15, and the surface signal control instrument 15 includes an AC power supply 24.
[0028] As an implementation mode of the present utility model, the AC power supply 24 includes a system power supply 22 and a sensor power supply 23 , the system power supply 22 is connected to the sensor power supply 23 , and the system power supply 22 is electrically connected to the signal separation main control circuit 16 .
[0029] As an implementation mode of the present utility model, the signal separation main control circuit 16 is responsible for the coordination and control of the overall system, and is used to effectively separate and pre-process the multiple signals compounded in the pressure signal capillary cable 14 .
[0030] As an implementation mode of the present utility model, the signal separation main control circuit 16 includes a sensor controller 17, a data backup unit 19, a signal processing unit 18, a 4G transmission module 20 and a human-computer interaction unit 21, and the sensor controller 17 is electrically connected to the sensor power supply 23 and the signal processing unit 18 at the same time.
[0031] As an implementation mode of the present invention, the signal processing unit 18 is used to accurately analyze and convert the separated pressure signal, and also includes data communication and backup, and can transmit data to the server side through the 4G module in real time to realize remote monitoring and management.
[0032] As an implementation mode of the utility model, the human-computer interaction unit 21 can calibrate the pressure measurement value through the control algorithm, and can perform real-time calibration processing on the pressure measurement value measured downhole to eliminate the influence of environmental factors and ensure the accuracy of the data, thereby providing accurate and reliable pressure data support for dynamic evaluation of oil reservoirs and production optimization.
[0033] Specific working principle:
[0034] like Figure 1-3 As shown, the pressure sensor 4 is a high-temperature hot-melt structure composed of a titanium alloy diaphragm and a sapphire single crystal insulator, so that the pressure sensor 4 can accurately monitor the dynamic pressure changes in the well in real time and transmit the data to the ground control center through the signal transmission system; the pressure sensor 4 is installed on the sensor welding seat 3, and the bottom end is welded to the pressure joint 2, and the outer sleeve is provided with an outer tube 1 5 and an outer tube 2 6.
[0035] like Figure 1-2 As shown, it should be noted that: in order to make the device have a good sealing structure, the pressure joint 2, the sensor welding seat 3 and the outer tube 1 5 and the outer tube 2 6 are brazed in a vacuum brazing furnace to ensure the high quality and high reliability of the welding parts, so that the pressure joint 2, the sensor welding seat 3 and the outer tube 1 5 and the outer tube 2 6 are perfectly welded together, thereby enhancing the stability of the overall structure and ensuring the accuracy of the pressure signal during the transmission process, further improving the working efficiency and service life of the underground long-term pressure monitoring device.
[0036] like Figure 3-4As shown, the pressure sensor 4 transmits the monitored pressure change to the pressure signal capillary cable 14 in the pressure signal transmission line 13 through the pressure signal terminal 12, and the pressure signal capillary cable 14 transmits the pressure signal collected downhole to the ground signal control instrument 15; because the ground signal control instrument 15 is for ground visual monitoring, it has high real-time performance, and because it is used for a long time, a power supply module with higher stability is selected for the sensor power supply 23, and a multi-core cable is used to connect the pressure sensor 4 and the ground signal control instrument 15. In order to solve the influence of the cable on the system signal transmission, an automatically controlled current source design is adopted in the design, and a high-precision instrument amplifier circuit is adopted in the signal sampling design, which greatly improves the amplification and collection requirements of tiny signals and fundamentally improves the accuracy of the system.
[0037] like Figure 3-4 As shown, the signal separation main control circuit 16 in the ground signal control instrument 15 effectively separates and preprocesses the various signals compounded in the pressure signal capillary cable 14, and coordinates and controls the overall system; at the same time, in the case of network disconnection or network instability, the data backup unit 19 can still completely save the pressure change information downhole to ensure data security and continuity. When connected to a computer, the data can also be transmitted to the signal data processing software to complete data recording and analysis.
[0038] like Figure 3-4 As shown, the signal separation main control circuit 16 accurately analyzes and converts the separated pressure signal through the signal processing unit 18, and can transmit the data to the server-side human-computer interaction unit 21 through the 4G transmission module 20 to realize remote monitoring and management. The transmission method between the 4G transmission module 20 and the signal separation main control circuit 16 is the MODBUS transmission protocol based on the 485 bus, which can effectively reduce the impact of external interference sources on the system in a complex electric field environment, and also improve the versatility of the equipment; the human-computer interaction unit 21 can calibrate the pressure measurement value through the control algorithm, and can perform real-time calibration processing on the pressure measurement value measured downhole to eliminate the influence of environmental factors and ensure the accuracy of the data, thereby providing accurate and reliable pressure data support for dynamic evaluation of oil reservoirs and production optimization; the device is compact and lightweight in structure design, and is easy to install at different positions in the wellbore to realize monitoring of pressure points at different depths. At the same time, it can be used in parallel with multi-point thermocouple temperature measurement, and the ground can be synchronously monitored visually with high real-time performance.
[0039] The implementation modes of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.
Claims
1. SAGD downhole long-term pressure monitoring device, including: A pressure inlet plug (1) and a pressure sensor (4), characterized in that: one end of the pressure inlet plug (1) is threadedly connected to a pressure fitting (2), the pressure fitting (2) is welded to a sensor welding seat (3) on a side away from the pressure inlet plug (1), the end of the pressure sensor (4) is welded to the middle part of the side of the sensor welding seat (3) away from the pressure fitting (2), the sensor welding seat (3) is welded to an outer tube (5) on the periphery of the same side where the pressure sensor (4) is connected, the end of the outer tube (5) away from the sensor welding seat (3) is connected to an outer tube (6), and the end of the outer tube (6) extends into the outer tube (5). A tightening cap (7) is provided in the middle of the outer tube (6), and a conical ring (8) is provided at one end of the tightening cap (7) away from the outer tube (6). An upper joint (9) is fixedly connected to the upper end of the tightening cap (7), and the upper joint (9) wraps around one third of the upper end of the tightening cap (7). The conical ring (8) is also fixedly connected to the upper joint (9) and is wrapped by the upper joint (9). A protective tube (10) is welded to one end of the upper joint (9) away from the tightening cap (7). A wire passing tube (11) is fixedly connected to the middle part of the upper joint (9), and the wire passing tube (11) passes through the upper joint (9) and extends out of the tightening cap (7).
2. The SAGD downhole long-term pressure monitoring device according to claim 1, characterized in that: The pressure sensor (4) is electrically connected to a terminal (12), the terminal (12) is electrically connected to a transmission line (13), the transmission line (13) is electrically connected to a capillary cable (14), and the capillary cable (14) is electrically connected to a ground signal control instrument (15).
3. The SAGD downhole long-term pressure monitoring device according to claim 2, characterized in that: The capillary cable (14) transmits the pressure signal collected underground to a surface signal control instrument (15), and the surface signal control instrument (15) comprises an AC power supply (24).
4. The SAGD downhole long-term pressure monitoring device according to claim 3, characterized in that: The AC power supply (24) comprises a system power supply (22) and a sensor power supply (23), the system power supply (22) is connected to the sensor power supply (23), and the system power supply (22) is electrically connected to a signal separation main control circuit (16).
5. The SAGD downhole long-term pressure monitoring device according to claim 4, characterized in that: The signal separation main control circuit (16) is responsible for the coordination and control of the overall system and is used to effectively separate and pre-process the multiple signals compounded in the pressure signal capillary cable (14).
6. The SAGD downhole long-term pressure monitoring device according to claim 4, characterized in that: The signal separation main control circuit (16) comprises a sensor controller (17), a data backup unit (19), a signal processing unit (18), a 4G transmission module (20) and a human-computer interaction unit (21), and the sensor controller (17) is electrically connected to the sensor power supply (23) and the signal processing unit (18) at the same time.
7. The SAGD downhole long-term pressure monitoring device according to claim 6, characterized in that: The signal processing unit (18) is used to accurately analyze and convert the separated pressure signal, and also includes data communication and backup, and can transmit data to the server side through the 4G module in real time to achieve remote monitoring and management.
8. The SAGD downhole long-term pressure monitoring device according to claim 6, characterized in that: The data backup unit (19) is used to completely save the underground pressure change information in the event of network disconnection or network instability, so as to ensure data security and continuity.
9. The SAGD downhole long-term pressure monitoring device according to claim 6, characterized in that: The human-machine interaction unit (21) can calibrate the pressure measurement value through a control algorithm, and can perform real-time calibration processing on the pressure measurement value measured downhole.