Storage type downhole pressure testing device and system

Abstract

The invention relates to the technical field of oil exploration, solves the technical problem of short-circuit corrosion of a sensor and a circuit board caused by oil, water and gas due to aging failure of a rubber sealing ring in the prior art, and particularly relates to a storage type underground pressure testing device and system. The bottom of the ground reading mechanism is provided with an underground high-temperature-resistant storage type pressure gauge used for measuring the underground pressure of an oil field, and the underground high-temperature-resistant storage type pressure gauge comprises a connecting top seat used for protecting an internal circuit of the pressure testing device, a battery outer cylinder and a circuit board outer cylinder. The aging condition of the sealing rubber ring after long-term use is avoided, the sealing effect is reduced, and the probability of short circuit or corrosion of the sensor and the circuit board in the device is reduced, so that the integrated welding does not affect maintenance, the service life of the device can be prolonged, and the short circuit corrosion problem of the device is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of petroleum exploration, and in particular to a storage-type downhole pressure testing device and system. Background Art

[0002] A downhole pressure gauge is a professional testing tool used to measure the downhole liquid or gas pressure of an oil and gas well in an oil field. A downhole pressure gauge can help engineers understand the pressure changes inside an oil well. A storage pressure gauge is usually installed inside a downhole tubing during oil and gas well testing operations, and is then taken out together with the downhole tubing for the next operation. Downhole working conditions are relatively harsh, usually facing high temperature, high pressure, vibration and corrosive environments, and after going down the well, it is usually placed in the well fluid for more than half a year or is frequently lifted up and down. These factors can easily cause the existing technology to malfunction, the rubber sealing ring inside the structure to age and fail, oil, water, gas and other substances enter the sensor, and then the circuit board and sensor are short-circuited and corroded, making the downhole pressure gauge unable to work normally, seriously affecting the normal work of the downhole and reducing the efficiency of the downhole work. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a dimming signal isolation converter, which solves the technical problem in the prior art that the rubber sealing ring is easily aged and fails, causing oil, water and gas to cause short-circuit corrosion of the sensor and the circuit board, thereby achieving the purpose of avoiding the aging of the sealing rubber ring and solving the problem that oil, water and gas cause short-circuit corrosion of the circuit board sensor.

[0004] To solve the above technical problems, the present invention provides the following technical solutions: a storage-type downhole pressure testing device, comprising a ground reading mechanism, at the bottom of which is provided a downhole high-temperature resistant storage pressure gauge for measuring the downhole pressure of an oil field.

[0005] Preferably, the downhole high-temperature resistant storage pressure gauge includes a connecting top seat, a battery outer cylinder and a circuit board outer cylinder for protecting the internal circuit of the pressure testing device. The connecting top seat, the battery outer cylinder and the circuit board outer cylinder are welded together, a battery buffer pad is fixedly connected to the top end of the circuit board outer cylinder, a pressure gauge circuit board is slidably connected to the bottom end of the battery buffer pad, a pressure gauge core is fixedly connected to the bottom end of the pressure gauge circuit board, and a guide pressure head is fixedly connected to the bottom end of the pressure gauge core.

[0006] Preferably, the downhole high-temperature resistant storage pressure gauge also includes a conductive needle fixedly connected to the top of the connecting top seat, a vibration buffer pad is fixedly connected to the bottom end of the inner wall of the connecting top seat, and a high-temperature lithium battery is fixedly connected to the bottom end of the vibration buffer pad for providing electrical energy to the pressure testing device.

[0007] Preferably, the downhole high-temperature resistant storage pressure gauge further comprises a pressure-conducting adapter fixedly connected to the bottom end of the pressure gauge core body for adding the pressure gauge core body.

[0008] Preferably, the ground reading mechanism includes a shell, a built-in steel ball rack is fixedly connected to the inner wall of the shell, a top circuit board for connecting a conductive needle is fixedly connected to the top of the built-in steel ball rack, a protective cover is fixedly connected to the top of the shell, a USB connecting cable is fixedly connected to the top of the protective cover, and the USB connecting cable and the top circuit board are fixedly connected via a wire, and a retaining ring is fixedly connected to the bottom of the shell.

[0009] Preferably, the ground reading mechanism also includes a limiting steel ring fixedly connected to the inside of the built-in steel ball rack, and a steel ball is slidably connected to the inside of the limiting steel ring.

[0010] Preferably, the side end of the shell is fixedly connected with an anti-lost chain, the side end of the anti-lost chain is rotatably connected with a connecting seat, and the bottom end of the connecting seat is fixedly connected with a rubber dust plug for dust prevention.

[0011] The technical solution also provides a downhole pressure testing system applied to a storage-type downhole pressure testing device, the system comprising a microprocessing module, and the pressure testing system further comprising a storage module, a power management module and an analog-to-digital conversion module.

[0012] Preferably, the power management module consists of a power chip and a current limiting resistor R2, the EN port of the power chip is connected to the microprocessor module, the Vin signal is connected to the IN port of the power chip, the OUT port of the power chip outputs the Vout signal, and the ILIM port of the power chip is grounded through the current limiting resistor R2.

[0013] Preferably, the analog-to-digital conversion module is composed of a varistor bridge, an analog-to-digital conversion chip and an RTD resistor, the varistor bridge is respectively connected to the REFIN1+ port, REFIN1- port, AIN1+ port and AIN1- port of the analog-to-digital conversion chip, the RTD resistor is connected to the RTD+ port of the analog-to-digital conversion chip, and the SPL_1 port of the analog-to-digital conversion chip is connected to the microprocessor module.

[0014] Preferably, the storage module is composed of a storage chip, and the SPL_2 port of the storage chip is connected to the microprocessor module.

[0015] Preferably, the model of the microprocessor module is STM32, the model of the storage module is W25Q256, the model of the power management module is TPS2553, and the model of the analog-to-digital conversion module is AD7799.

[0016] By means of the above technical solution, the present invention provides a storage-type downhole pressure testing device and system, which has at least the following beneficial effects:

[0017] 1. The present invention uses an integrated welding connection method to weld and seal the internal structure of the storage-type downhole pressure testing device as a whole, and also uses welding at the connection parts of the key shell to avoid aging of the sealing rubber ring due to long-term use, which leads to a decrease in the sealing effect and reduces the probability of short circuit or corrosion of the internal sensors and circuit boards of the device. Since the storage-type downhole pressure testing device needs to be used continuously underground for more than one year, the integrated welding not only does not affect maintenance, but also increases the service life of the device and reduces the problem of short circuit corrosion in the device.

[0018] 2. The present invention enables the outer shell of the pressure testing device to work in a high temperature environment of several hundred degrees through the high temperature resistant shell, connecting top seat, battery outer cylinder and circuit board outer cylinder, which is much higher than the 150 degree high temperature resistance of the prior art. In addition, in a high temperature environment, the device is powered by a high temperature lithium battery, which can provide stable power to the circuit system of the storage type pressure testing device and extend the service life of the device.

[0019] 3. Through the synergistic effect of the storage module and the power management module, the present invention can store the test results in real time during the pressure detection process, and the storage time is greater than one year, which is convenient for the staff to conduct long-term testing of the downhole pressure. At the same time, the power management module of the device can intelligently adjust the power supply mode of the device, so that the device can operate stably for a long time with low power consumption.

[0020] 4. The present invention is connected to the computer at the top via a USB cable to detect the downhole pressure and temperature in real time, and accurately fits and warns the pressure and temperature through an artificial intelligence model, which not only ensures the accuracy of downhole parameter acquisition, but also can predict and warn of downhole conditions, ensuring the safety of downhole work in oil and gas wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0022] Figure 1 It is a side plan view of a storage type downhole pressure testing device of the present invention;

[0023] Figure 2 is a side sectional view of the ground reading mechanism of the present invention;

[0024] Figure 3 It is a side cross-sectional view of the underground high temperature resistant storage pressure gauge of the present invention;

[0025] Figure 4 It is a structural block diagram of a storage-type downhole pressure testing system of the present invention;

[0026] Figure 5 The circuit diagram of the storage type downhole pressure testing system of the present invention;

[0027] Figure 6 A circuit diagram of a microprocessor module and an analog-to-digital conversion module of the present invention;

[0028] Figure 7 A circuit diagram of a storage module and a power management module of the present invention;

[0029] Figure 8 It is a fitting curve diagram of the temperature and pressure data of the present invention;

[0030] Fig. 9 The present invention is a flow chart of collecting data for the storage-type downhole pressure testing system.

[0031] In the figure: 1. Downhole high-temperature resistant storage pressure gauge; 11. Conductive needle; 12. Connecting top seat; 13. Vibration cushion; 14. High-temperature lithium battery; 15. Battery outer tube; 16. Battery cushion; 17. Pressure gauge circuit board; 18. Circuit board outer tube; 19. Pressure gauge core; 110. Pressure adapter; 111. Guide pressure head; 2. Ground reading mechanism; 21. Rubber dust plug; 22. Connecting seat; 23. Anti-lost chain; 24. Shell; 25. Built-in steel ball rack; 26. Top circuit board; 27. Protective cover; 28. USB connecting cable; 29. ​​Steel ball; 210. Limiting steel ring; 211. Retaining ring; 3. Microprocessor module; 4. Storage module; 5. Power management module; 6. Analog-to-digital conversion module. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0033] Embodiment 1

[0034] Due to the existing technology, the rubber seal ring is prone to aging and failure, which causes the oil, water and gas to cause short circuit corrosion of the sensor and circuit board. Please refer to Figure 1 - Figure 3The present embodiment provides a storage-type downhole pressure test device, which can avoid the aging of the sealing rubber ring and solve the problem that the oil, water and gas cause the circuit board sensor to short-circuit and corrode. The device includes a ground reading mechanism 2, and a downhole high-temperature storage pressure gauge 1 for measuring the downhole pressure of the oil field is arranged at the bottom of the ground reading mechanism 2. The downhole high-temperature storage pressure gauge 1 includes a connecting top seat 12, a battery outer tube 15 and a circuit board outer tube 18 for protecting the internal circuit of the pressure test device. The connecting top seat 12, the battery outer tube 15 and the circuit board outer tube 18 are welded, and the top of the circuit board outer tube 18 is fixedly connected to a battery buffer pad 16, and the bottom of the battery buffer pad 16 is slidably connected to a pressure gauge circuit Board 17, the bottom end of the pressure gauge circuit board 17 is fixedly connected to a pressure gauge core 19, the bottom end of the pressure gauge core 19 is fixedly connected to a guide pressure head 111, the underground high-temperature resistant storage pressure gauge 1 and the ground reading mechanism 2 are integrally welded, the underground high-temperature resistant storage pressure gauge 1 also includes a conductive needle 11 fixedly connected to the top of the connecting top seat 12, the bottom end of the inner wall of the connecting top seat 12 is fixedly connected to a vibration buffer pad 13, the bottom end of the vibration buffer pad 13 is fixedly connected to a high-temperature lithium battery 14 for providing electrical energy to the pressure testing device, the underground high-temperature resistant storage pressure gauge 1 also includes a pressure adapter 110 fixedly connected to the bottom end of the pressure gauge core 19 for adding the pressure gauge core 19.

[0035] In the present invention, the temperature and pressure underground are detected by an underground high-temperature storage pressure gauge 1, wherein the top seat 12, the battery outer tube 15, the circuit board outer tube 18 and the shell 24 are all connected by all-round integrated welding using high-temperature resistant metal materials. The high-temperature resistant metal material can be made of 316L stainless steel, which can maintain the shell function at a high temperature of 900-1300 degrees Celsius. During use, the high-temperature lithium battery 14 on the top is effectively buffered by the battery buffer pad 16. The pressure gauge circuit board 17, the pressure gauge core 19 and the guide pressure head 111 constitute the main circuit for measuring temperature and pressure. The pressure adapter 110 has different connection methods in different situations. When two pressure gauge cores 19 are used, the pressure adapter 110 is used to connect the two pressure gauge cores 19 at the same time. If only one pressure gauge core 19 is used, Then the pressure conducting adapter 110 may not be used. While the outer shell is resistant to high temperatures, in order to enable the functions of the device to work normally in a high temperature environment, the present invention uses a high temperature lithium battery 14. The high temperature lithium battery is a high temperature resistant lithium battery that can withstand temperatures above 150 degrees Celsius. Through the heat absorption effect of the shell, the battery can work normally in a high temperature environment underground and provide safe and stable electric energy for the device. At the same time, through the vibration buffer pad 13 and the top for buffering, the conductive needle 11 can play a conductive role. Through the high temperature resistant shell, the connecting top seat, the battery outer cylinder and the circuit board outer cylinder, the outer shell of the pressure testing device can work in a high temperature environment of several hundred degrees, which is much higher than the 150 degree high temperature resistance of the prior art. In addition, in a high temperature environment, the device is powered by a high temperature lithium battery, which can provide stable electric energy to the circuit system of the storage pressure testing device and extend the service life of the device.

[0036] The ground reading mechanism 2 includes a shell 24, a built-in steel ball rack 25 is fixedly connected to the inner wall of the shell 24, a top circuit board 26 for connecting the conductive needle 11 is fixedly connected to the top of the built-in steel ball rack 25, a protective cover 27 is fixedly connected to the top of the shell 24, a USB connection line 28 is fixedly connected to the top of the protective cover 27, and the USB connection line 28 and the top circuit board 26 are fixedly connected by a wire, a retaining ring 211 is fixedly connected to the bottom of the shell 24, and the ground reading mechanism 2 also includes a limiting steel ring 210 fixedly connected to the inside of the built-in steel ball rack 25, a steel ball 29 is slidably connected to the inside of the limiting steel ring 210, an anti-lost chain 23 is fixedly connected to the side end of the shell 24, the side end of the anti-lost chain 23 is rotatably connected to the connecting seat 22, and the bottom end of the connecting seat 22 is fixedly connected to a rubber dust plug 21 for dust prevention.

[0037] The reading function can be realized through the ground reading mechanism 2 on the top. Before the working process, the working condition of the device is monitored to ensure that the device can work normally. The ground reading mechanism 2 and the underground high-temperature storage pressure gauge 1 and some connecting gaps are welded as one piece by an integrated welding method. The shell 24 inside the ground reading mechanism 2 can protect the entire device. The limiting steel ring 210 and the steel ball 29 on the built-in steel ball rack 25 can perform the initial fixation of the ground reading mechanism 2 before welding. There is also a conductive pin on the top circuit board 26. In order to connect and energize the conductive pin 11, the protective cover 27 protects the USB connection line 28 to ensure that liquid can be prevented from entering between the USB connection line 28 and the top circuit board 26. When the device is not in use, the ground reading mechanism The structure 2 is separate from the downhole high-temperature resistant storage pressure gauge 1. In order to prevent the interior from being contaminated by dust, the rubber dust plug 21 connected by the anti-lost chain 23 and the connecting seat 22 is used to protect the inside of the device. The internal structure of the storage downhole pressure testing device is welded and sealed as a whole through an integrated welding connection. Welding is also used at the connection parts of the key shell to avoid aging of the sealing rubber ring due to long-term use, which leads to a decrease in the sealing effect and reduces the probability of short circuit or corrosion of the sensors and circuit boards inside the device. Since the storage downhole pressure testing device needs to be used continuously underground for more than one year, the integrated welding not only does not affect maintenance, but also enhances the service life of the device and reduces the problem of short circuit corrosion in the device.

[0038] Embodiment 2

[0039] In this embodiment, since the device is working underground for a long time, a large amount of data is generated during its working process. In order to save and analyze a large amount of data, please refer to Figure 4 - Figure 7, this embodiment provides a storage-type downhole pressure test system, which can not only store a large amount of downhole temperature and pressure data, but also analyze and predict these data. The system includes a microprocessor module 3, and the pressure test system also includes a storage module 4, a power management module 5 and an analog-to-digital conversion module 6. The power management module 5 is composed of a power chip and a current-limiting resistor R ground reading mechanism 2. The EN port of the power chip is connected to the microprocessor module 3, the Vin signal is connected to the IN port of the power chip, the OUT port of the power chip outputs the Vout signal, the ILIM port of the power chip is grounded through the current-limiting resistor R ground reading mechanism 2, and the analog-to-digital conversion module 6 is composed of a pressure The varistor is composed of a varistor bridge, an analog-to-digital conversion chip and an RTD resistor. The varistor bridge is respectively connected to the REFIN1+ port, REFIN1- port, AIN1+ port and AIN1- port of the analog-to-digital conversion chip, the RTD resistor is connected to the RTD+ port of the analog-to-digital conversion chip, the SPL_1 port of the analog-to-digital conversion chip is connected to the microprocessor module 3, the storage module 4 is composed of a storage chip, the SPL_2 port of the storage chip is connected to the microprocessor module 3, the model of the microprocessor module 3 is STM32, the model of the storage module 4 is W25Q256, the model of the power management module 5 is TPS2553, and the model of the analog-to-digital conversion module 6 is AD7799.

[0040] The system of the present invention controls the entire system through the microprocessor module 3 during operation, wherein the storage module 4 can store a large amount of measurement data, enabling the device to be used for a long time for more than one year, ensuring the long-term and continuity of operation. At the same time, the power management module 5 can adjust the device to a low-power mode, also known as a sleep mode, according to changes in the use environment. In the sleep mode, the temperature and pressure can be measured with extremely low power consumption, ensuring that the device can work for a long time underground. The analog-to-digital conversion module 6 can convert the pressure into an electrical signal and transmit it to the microprocessor module 3 for analysis. When sampling the data, please refer to Fig. 9 , the collection steps are as follows: S1, check whether the sleep timing time is reached; if not, repeat step S1; if so, the RTC timing terminal wakes up; S2, the analog-to-digital conversion module 6 and the external Flash start to power on; S3, initialize MSC and CDC; S4, initialize the file system;

[0041] S5, mount the file system; S6, perform single sampling; S7, open the current file; S8, save data to the current file; S9, close the current file; S10, enable external interrupt, set RTC timer wake-up and end.

[0042] If the host computer is used to obtain the bottom temperature and pressure data through USB, the steps are: S1, check whether the USB is inserted; if not, repeat step S1; if so, external interrupt wake-up; S2, analog-to-digital conversion module 6 and external Flash start to power on; S3, initialize MSC and CDC; S4, initialize the file system; S5, respond to the host computer data request; S6, check whether the USB is unplugged; if not, return to step S5; if so, turn on the external interrupt, set the RTC timer wake-up and end. After acquiring the data, the present invention can also analyze and warn the data through intelligent software. The present invention uses a curve fitting algorithm to fit and warn continuous variables. While fitting and warning continuous variables, it can also generate a data curve graph. Please refer to Figure 8 , it can display the temperature and pressure data more vividly, so that the staff can understand the temperature and pressure conditions downhole. Through the synergy of the storage module and the power management module, the test results can be stored in real time during the pressure detection process, and the storage time is more than one year, which is convenient for the staff to conduct long-term testing of downhole pressure. At the same time, the power management module of this device can intelligently adjust the model of the device so that the device can operate stably for a long time under low power consumption. It is connected to the computer on the top through a USB cable to detect the downhole pressure and temperature in real time. The pressure and temperature are accurately fitted and warned through the artificial intelligence model, which not only ensures the accuracy of downhole parameter acquisition, but also can predict and warn the downhole situation to ensure the safety of downhole work in oil and gas wells.

[0043] The above implementation methods have been described in detail. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A storage type downhole pressure testing device, comprising a surface reading mechanism (2), characterized in that: The bottom of the ground reading mechanism (2) is provided with a downhole high temperature resistant storage pressure gauge (1) for measuring the downhole pressure of the oil field; The underground high-temperature storage pressure gauge (1) comprises a connection top seat (12) for protecting the internal circuit of the pressure testing device, a battery outer tube (15) and a circuit board outer tube (18); the connection top seat (12), the battery outer tube (15) and the circuit board outer tube (18) are welded together; the top of the circuit board outer tube (18) is fixedly connected to a battery buffer pad (16); the bottom of the battery buffer pad (16) is slidably connected to a pressure gauge circuit board (17); the bottom of the pressure gauge circuit board (17) is fixedly connected to a pressure gauge core (19); the bottom of the pressure gauge core (19) is fixedly connected to a guide pressure head (111); the underground high-temperature storage pressure gauge (1) and the ground reading mechanism (2) are integrally welded together.

2. The pressure testing device according to claim 1, characterized in that: The downhole high-temperature storage pressure gauge (1) further comprises a conductive needle (11) fixedly connected to the top of a connecting top seat (12); a vibration buffer pad (13) is fixedly connected to the bottom end of the inner wall of the connecting top seat (12); and a high-temperature lithium battery (14) for providing electrical energy to the pressure testing device is fixedly connected to the bottom end of the vibration buffer pad (13).

3. The pressure testing device according to claim 1, characterized in that: The underground high-temperature resistant storage pressure gauge (1) further comprises a pressure-conducting adapter (110) fixedly connected to the bottom end of the pressure gauge core (19) for installing the pressure gauge core (19).

4. The pressure testing device according to claim 1, characterized in that: The ground reading mechanism (2) comprises a shell (24), the inner wall of the shell (24) is fixedly connected to a built-in steel ball rack (25), the top of the built-in steel ball rack (25) is fixedly connected to a top circuit board (26) for connecting a conductive needle (11), the top of the shell (24) is fixedly connected to a protective cover (27), the top of the protective cover (27) is fixedly connected to a USB connection line (28), and the USB connection line (28) and the top circuit board (26) are fixedly connected via a wire, and the bottom of the shell (24) is fixedly connected to a retaining ring (211).

5. The pressure testing device according to claim 1, characterized in that: The ground reading mechanism (2) further comprises a limit steel ring (210) fixedly connected to the interior of the built-in steel ball rack (25), and a steel ball (29) is slidably connected to the interior of the limit steel ring (210).

6. The pressure testing device according to claim 4, characterized in that: The side end of the housing (24) is fixedly connected to an anti-lost chain (23), the side end of the anti-lost chain (23) is rotatably connected to a connecting seat (22), and the bottom end of the connecting seat (22) is fixedly connected to a rubber dust plug (21) for preventing dust.

7. A pressure testing system applied to the storage-type downhole pressure testing device according to any one of claims 1 to 6, comprising a microprocessing module (3), characterized in that: The pressure testing system also includes a storage module (4), a power management module (5) and an analog-to-digital conversion module (6); The power management module (5) is composed of a power chip and a current limiting resistor R ground reading mechanism (2); the EN port of the power chip is connected to the microprocessor module (3); the Vin signal is connected to the IN port of the power chip; the OUT port of the power chip outputs the Vout signal; and the ILIM port of the power chip is grounded via the current limiting resistor R ground reading mechanism (2); The analog-to-digital conversion module (6) is composed of a varistor bridge, an analog-to-digital conversion chip and an RTD resistor. The varistor bridge is respectively connected to the REFIN1+ port, REFIN1- port, AIN1+ port and AIN1- port of the analog-to-digital conversion chip, the RTD resistor is connected to the RTD+ port of the analog-to-digital conversion chip, and the SPL_1 port of the analog-to-digital conversion chip is connected to the microprocessor module (3).

8. The pressure testing device according to claim 7, characterized in that: The storage module (4) is composed of a storage chip, and the SPL_2 port of the storage chip is connected to the microprocessor module (3).

9. The pressure testing device according to claim 7, characterized in that: The model of the microprocessor module (3) is STM32, the model of the storage module (4) is W25Q256, the model of the power management module (5) is TPS2553, and the model of the analog-to-digital conversion module (6) is AD7799.

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