A gas well downhole temperature and pressure monitoring device and method

Abstract

This invention provides a gas well downhole temperature and pressure monitoring device and method. The device includes: a depth monitoring module for monitoring depth data and determining the well depth and sending it to a control module; a temperature and pressure monitoring module connected to the control module for collecting temperature and pressure data and sending them to the control module; a control module connected to the electromagnetic module, the depth monitoring module, and the temperature and pressure monitoring module respectively, for storing temperature and pressure data and controlling the opening and closing of the power supply to power the electromagnetic module, the depth monitoring module, and the temperature and pressure monitoring module according to the well depth; an upper electromagnetic module of the electromagnetic module connected to the control module and a current flow channel module respectively, for controlling the current flow channel to circulate when the power is disconnected, or for controlling the current flow channel to close when the power is closed; and a lower electromagnetic module of the electromagnetic module connected to the control module and a locking module respectively, for controlling the locking module to extend when the power is disconnected or for controlling the locking module to retract when the power is closed.

Description

Technical Field

[0001] This invention relates to the field of gas well development technology, and further to the field of gas well production dynamic monitoring technology, and particularly to a gas well downhole temperature and pressure monitoring device and method. Background Technology

[0002] During natural gas extraction, different gas production technologies are required to maximize production efficiency. As extraction progresses, the downhole environment and conditions constantly change. Therefore, to adjust and optimize process parameters in a timely manner, continuous monitoring of the gas well's production dynamics is necessary to improve gas field recovery. Downhole temperature and pressure, as core monitoring parameters, are crucial for guiding rational gas well extraction.

[0003] Currently, downhole temperature and pressure measurements are typically performed using three methods: 1. Deploying permanent pressure sensors; 2. Lowering a trailer along with the pressure sensor and retrieving the sensor after a period of time for data reading; 3. Deploying cables or fiber optics and equipping them with direct-reading pressure sensors for dynamic monitoring. However, all three methods require equipment such as cables, winches, and cranes. Furthermore, they necessitate matching blowout preventers, lubricants, and multiple professionals for installation and operation, increasing operational complexity, time costs, and labor costs. Moreover, due to the harsh downhole environment, cables and permanent sensors require reliable or continuous maintenance, increasing maintenance costs. In summary, existing monitoring methods are costly. Summary of the Invention

[0004] The first objective of this invention is to provide a gas well downhole temperature and pressure monitoring device and method, which simplifies the downhole temperature and pressure monitoring process and reduces time and labor costs. The gas well downhole temperature and pressure monitoring device provided by this invention is a wireless device, eliminating the need for cables and other maintenance-intensive equipment, thus reducing maintenance costs.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] In a first aspect, the present invention discloses a downhole temperature and pressure monitoring device for gas wells. The device includes a control module, an electromagnetic module, a depth monitoring module, a flow channel module, a locking module, and a temperature and pressure monitoring module. The depth monitoring module monitors depth data, determines the well depth based on the depth data, and sends the data to the control module. The temperature and pressure monitoring module is connected to the control module and collects temperature and pressure data, sending them to the control module. The control module is connected to the electromagnetic module, the depth monitoring module, and the temperature and pressure monitoring module, respectively, and is used to store the temperature and pressure data, and also to control the opening and closing of the power supply according to the well depth. The electromagnetic module, the depth monitoring module, and the temperature and pressure monitoring module are powered. The upper electromagnetic module of the electromagnetic module is connected to the control module and the overcurrent channel module, respectively, and is used to control the overcurrent channel to flow so that the whole device moves downward when the power is disconnected by the control module, or to control the overcurrent channel to close so that the whole device moves upward when the power is closed by the control module. The lower electromagnetic module of the electromagnetic module is connected to the control module and the locking module, respectively, and is used to control the locking module to extend the locking device to lock the device when the power is disconnected by the control module, or to control the locking module to retract the locking device to move the device when the power is closed by the control module.

[0007] Optionally, the control module includes an upper power module, a lower power module, a data storage module, and a data processing module. The upper power module is connected to the upper electromagnetic module, the temperature and pressure monitoring module, the data processing module, and the data storage module, and is used to supply power to the upper electromagnetic module, the temperature and pressure monitoring module, and the data storage module. The lower power module is connected to the data processing module, the depth monitoring module, and the lower electromagnetic module, and is used to supply power to the data processing module, the depth monitoring module, and the lower electromagnetic module. The data storage module is also connected to the upper electromagnetic module and the temperature and pressure monitoring module, and is used to store the temperature and pressure data collected by the temperature and pressure monitoring module. The data processing module is also connected to the depth monitoring module, and is used to analyze whether the well depth has reached a preset depth and whether the settling time has reached a preset monitoring time, and send the analysis results to the power module to cause the power module to close or open.

[0008] Optionally, if the analysis result indicates that the preset depth has not been reached, the upper power module is disconnected and the lower power module is closed; if the analysis result indicates that the preset depth has been reached or the preset monitoring time has not been reached, the upper power module is disconnected and the lower power module is disconnected; if the analysis result indicates that the preset monitoring time has been reached, the upper power module is closed and the lower power module is closed.

[0009] Optionally, the upper electromagnetic module includes an upper spring, an upper fixed iron core, an upper moving iron core, and an upper induction coil; one end of the upper fixed iron core is fixedly installed at the lower end of the data storage module, and the other end is connected to the upper moving iron core through the upper spring; the upper induction coil is connected to the upper power module and is used to provide an upward attractive force to the lower moving iron core when the upper power supply is powered; the upper moving iron core is located inside the annular structure of the upper induction coil and is also connected to the overcurrent channel module, and is used to move upward to close the overcurrent channel when the upper power supply provides an upward attractive force, and is also used to move downward to allow the overcurrent channel to flow when the upper power supply is de-energized by the elastic force of the upper spring.

[0010] Optionally, the lower electromagnetic module includes a lower spring, a lower moving iron core, a lower fixed iron core, and a lower induction coil; the lower fixed iron core is connected to the lower moving iron core via the lower spring; the lower induction coil is connected to the lower power module and is used to provide a downward attractive force to the lower moving iron core when the lower power supply is powered; the lower moving iron core, located inside the annular structure of the lower induction coil, is also connected to the locking module and is used to move downward to drive the locking module to retract into the locking device when the lower power supply provides a downward attractive force, and is also used to move upward to drive the locking module to extend out of the locking device through the elastic force of the lower spring when the lower power supply is de-energized.

[0011] Optionally, the gas well downhole temperature and pressure monitoring device provided by the present invention further includes a housing, inside which the control module, the electromagnetic module, the depth monitoring module, and the temperature and pressure monitoring module are installed, for protecting the control module, the electromagnetic module, the depth monitoring module, and the temperature and pressure monitoring module.

[0012] Optionally, the flow channel module includes a sealing head, a sealing seat, a flow channel, and an inner channel; the sealing seat is located directly above the sealing head and fixedly installed on the inner wall of the housing; the sealing head is connected to the lower end of the upper moving iron core, and is used to move upward to contact the sealing seat when the moving iron core moves upward to close the flow channel, and also to move downward to separate from the sealing seat when the moving iron core moves downward to allow the flow channel to flow; the inner channel is opened on both sides of the sealing head at an upper-lower relative position to the sealing seat, and is used for natural gas to flow into the flow channel; the flow channel is located between the sealing head, the sealing seat, and the inner channel, and is used to prevent the inflow of natural gas when the flow channel is closed, and also to allow natural gas to flow in when the flow channel is open.

[0013] Optionally, the sealing seat and the sealing head are made of rubber, the maximum outer diameter of the sealing seat is larger than the maximum outer diameter of the sealing head, and the sealing head is an arc surface.

[0014] Optionally, the locking module includes a locking spring, a slider, a transmission rod, and a locking device; the slider is connected to the lower moving iron core and is used to drive the slider to slide horizontally for the first time when the lower moving iron core moves upward, thereby driving the transmission rod and the slider connection end to rotate to both sides, and is also used to drive the slider to slide horizontally for the second time when the lower moving iron core moves downward, thereby driving the transmission rod and the slider connection end to rotate towards the middle; the transmission rod is connected to the locking device through a shaft pin and is used to drive the locking device to move upward when the transmission rod and the slider connection end rotates to both sides, or is also used to drive the locking device to move downward when the transmission rod and the slider connection end rotates towards the middle; the locking spring is connected between the locking devices and is used to retract the locking device when the transmission rod rotates and drives the locking device to move downward.

[0015] Optionally, the upper electromagnetic module further includes an upper sealing ring, which is installed at the position where the upper moving iron core and the outer shell are displaced, to prevent gas and liquid from entering the upper electromagnetic module.

[0016] Optionally, the depth monitoring module includes an eddy current sensor.

[0017] Optionally, the depth monitoring module includes a depth monitoring housing to protect the acquired eddy current signals from interference.

[0018] Optionally, the temperature and pressure monitoring module includes a temperature and pressure sensor.

[0019] Secondly, the present invention discloses a method for monitoring downhole temperature and pressure in a gas well, the method comprising: collecting and storing temperature data and pressure data at a preset depth using the aforementioned downhole temperature and pressure monitoring device; and reading the stored temperature data and pressure data in response to the operation of the downhole temperature and pressure monitoring device returning to the wellhead.

[0020] Optionally, the gas well downhole temperature and pressure monitoring device collects and stores temperature and pressure data at a preset depth, including: Step 101: In response to the completion of the preset parameter initialization operation, stopping power supply to the upper electromagnetic module and continuing power supply to the lower electromagnetic module, wherein the preset parameters include a preset depth and a preset monitoring time; Step 102: The upper electromagnetic module controls the flow channel module to form a flowing flow channel, so that natural gas enters the flowing flow channel and reduces the upward thrust of natural gas; Step 103: The lower electromagnetic module drives the locking module to retract the locking device and control the device to move downward; Step 104: The depth monitoring module determines the well depth based on the collected depth data and sends it to the data processing module; Step 105: The data processing module determines whether the well depth has reached the preset depth. If yes, it executes step 106; if no, it executes step 104; Step 106: Disconnect the lower electromagnetic module... Source module; Step 107: The lower electromagnetic module drives the locking module to extend the locking device to control the device to be fixed; Step 108: The temperature and pressure monitoring module collects the temperature and pressure data of natural gas and sends them to the data storage module for storage; Step 109: The data processing module determines whether the monitoring time has reached the preset monitoring time. If yes, execute step 110; if no, execute step 108; Step 110: Continue to supply power to the upper electromagnetic module and stop supplying power to the lower electromagnetic module; Step 111: The upper electromagnetic module drives the flow channel module to move upward to form a closed flow channel so that natural gas cannot enter the flowing flow channel; Step 112: The lower electromagnetic module drives the locking module to extend the locking device to control the device to move upward; Repeat steps 104 and 112 until temperature and pressure data are collected and stored at all preset depths, and return to the wellhead.

[0021] The gas well downhole temperature and pressure monitoring device provided in this invention utilizes an upper electromagnetic module to control the flow through the channel, ensuring that the device's own weight is greater than the upward thrust of natural gas. A lower electromagnetic module controls the locking module to retract its locking device upon power activation by the control module, causing the device to move downwards. The lower electromagnetic module also controls the locking module to extend its locking device upon power deactivation by the control module, ensuring the device locks itself at a preset depth during downward movement. Alternatively, the upper electromagnetic module controls the flow through the channel to close, ensuring the device's own weight is less than the upward thrust of natural gas. The lower electromagnetic module controls the locking module to retract its locking device upon power activation by the control module, causing the device to move upwards. The lower electromagnetic module also controls the locking module to extend its locking device upon power deactivation by the control module, ensuring the device locks itself at a preset depth during upward movement. This invention enables the self-moving of the gas well downhole temperature and pressure monitoring device, reducing the difficulty of downhole temperature and pressure monitoring. It eliminates the need for equipment such as cables, winches, cranes, blowout preventers, and lubricators, and also reduces the need for multiple professionals for installation and operation, simplifying the downhole temperature and pressure monitoring workflow and lowering time and labor costs. The gas well downhole temperature and pressure monitoring device provided by this invention is wireless, eliminating the need for cables and other maintenance-required equipment, thus reducing maintenance costs. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the structure of a gas well downhole temperature and pressure monitoring device according to the present invention is shown;

[0024] Figure 2 This diagram shows a schematic of the structure of a gas well downhole temperature and pressure monitoring device of the present invention when the locking device is extended;

[0025] Figure 3 This diagram illustrates the structure of a gas well downhole temperature and pressure monitoring device of the present invention when the flow channel is closed.

[0026] Figure 4 A flowchart of a gas well downhole temperature and pressure monitoring method according to the present invention is shown;

[0027] Figure 5 A flowchart of step 100 of the present invention is shown. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] To address the problems existing in the measurement of downhole temperature and pressure in the prior art, this invention proposes a downhole temperature and pressure monitoring device for gas wells. The device includes a control module, an electromagnetic module, a depth monitoring module, a flow channel module, a locking module, and a temperature and pressure monitoring module.

[0030] The depth monitoring module is used to monitor depth data, determine the well depth based on the depth data, and send it to the control module.

[0031] The temperature and pressure monitoring module is connected to the control module. The lower end of the temperature and pressure monitoring module is connected to the temperature and pressure transmission channel, which is used to collect the temperature and pressure data of natural gas in the temperature and pressure transmission channel and send them to the control module.

[0032] The control module is connected to the electromagnetic module, depth monitoring module, and temperature and pressure monitoring module respectively. It is used to store the temperature and pressure data collected by the temperature and pressure monitoring module, and also to control the power supply to the electromagnetic module, depth monitoring module, and temperature and pressure monitoring module according to the well depth.

[0033] The upper electromagnetic module is connected to both the control module and the overcurrent channel module. It controls the flow of current through the overcurrent channel to move the entire device downwards when the control module disconnects the power, or it controls the overcurrent channel to close when the control module closes the power, causing the entire device to move upwards. The lower electromagnetic module is connected to both the control module and the locking module. It controls the locking module to extend its locking device to lock the device when the control module disconnects the power, or it controls the locking module to retract its locking device to move the device when the control module turns the power on.

[0034] The system achieves the following: The upper electromagnetic module controls the flow through the passageway to ensure the device's own weight exceeds the upward thrust of the natural gas; the lower electromagnetic module controls the locking module to retract its locking device upon power activation by the control module, causing the device to move downwards; the lower electromagnetic module also controls the locking module to extend its locking device upon power deactivation by the control module, causing the device to lock at a preset depth during downward movement. Alternatively, the upper electromagnetic module controls the flow passage to close, ensuring the device's own weight is less than the upward thrust of the natural gas; the lower electromagnetic module controls the locking module to retract its locking device upon power activation by the control module, causing the device to move upwards; the lower electromagnetic module also controls the locking module to extend its locking device upon power deactivation by the control module, causing the device to lock at a preset depth during upward movement.

[0035] As described above, the gas well downhole temperature and pressure monitoring device provided by this invention achieves self-movement, reducing the difficulty of downhole temperature and pressure monitoring. It eliminates the need for equipment such as cables, winches, cranes, blowout preventers, and lubricators, and requires fewer professionals for installation and operation, simplifying the downhole temperature and pressure monitoring workflow and reducing time and labor costs. Furthermore, the gas well downhole temperature and pressure monitoring device provided by this invention is wireless, eliminating the need for cables and other maintenance-required equipment, thus reducing maintenance costs.

[0036] In some embodiments, the device further includes a housing housing, inside which control modules, electromagnetic modules, depth monitoring modules, and temperature and pressure monitoring modules are installed for protection. This eliminates the need for cables and other maintenance-intensive equipment, reducing maintenance costs and thus lowering the cost of downhole temperature and pressure monitoring in gas wells. The housing can be made of PEEK material to better protect the internal modules from the downhole environment, extending their lifespan and reducing the difficulty of temperature and pressure monitoring, thereby enabling the acquisition of abundant downhole temperature and pressure data.

[0037] In some implementations, such as Figure 1 As shown, the control module includes an upper power supply module 1, a lower power supply module 23, a data storage module 2, and a data processing module 24. The upper electromagnetic module 7 includes an upper spring 10, an upper fixed iron core 8, an upper moving iron core 9, an upper induction coil 11, and an upper sealing ring 12. The lower electromagnetic module 21 includes a lower spring, a lower moving iron core, a lower fixed iron core, and a lower induction coil. The flow channel module includes a sealing head 15, a sealing seat 16, a flow channel 14, and an inner channel 27. The locking module includes a locking spring 18, a slider 20, a transmission rod 28, and a locking device 17.

[0038] It should be noted that the depth monitoring module 25 includes an eddy current sensor. The depth monitoring module 25 is surrounded by a depth monitoring housing 26, which protects the acquired eddy current signal from interference, thereby ensuring the safety and accuracy of the data collected by the device. The depth monitoring housing 26 can be made of PEEK material to further protect the acquired eddy current signal from interference. The locking device 17 can be a locking device. The temperature and pressure monitoring module 3 includes a temperature and pressure sensor. A conduction channel 4 is opened in the housing at the lower end of the temperature and pressure monitoring module, allowing the downhole flow temperature and pressure to be directly conducted to the temperature and pressure sensor, thereby accurately acquiring and recording temperature and pressure data.

[0039] The upper power module 1 is connected to the upper induction coil 11, temperature and pressure monitoring module 3, data processing module 24 and data storage module 2 of the upper electromagnetic module 7, respectively, and is used to supply power to the upper electromagnetic module 7, temperature and pressure monitoring module 3, data processing module 24 and data storage module 2.

[0040] The lower power module 23 is connected to the lower induction coil of the data processing module 24, the depth monitoring module 25, and the lower electromagnetic module 21, and is used to supply power to these modules. Specifically, the lower end of the lower power module 23 is connected to the data processing module 24, the depth monitoring module 25 is located at the lower end of the data processing module 24, and the upper end of the lower power module 23 is connected to the lower induction coil. It is worth noting that sealing rings 22 are installed at both ends of the lower power module 23 to prevent gas and liquid from entering the lower power module and to protect it.

[0041] The data storage module 2 is also connected to the upper electromagnetic module 7 and the temperature and pressure monitoring module 3. It is used to store the temperature and pressure data collected by the temperature and pressure monitoring module so that when the monitoring device moves to the wellhead, it can read the collected temperature and pressure data from the data storage module, reduce the probability of data loss during data transmission, and improve the reliability of obtaining dynamic production data of the gas well downhole.

[0042] The temperature and pressure monitoring module 3 has first sealing rings 6 on both sides to protect it from external environmental influences and extend its service life. A wiring channel 5 is provided on one side of the temperature and pressure monitoring module for the passage of connecting wires from other modules, facilitating connection with other modules.

[0043] The data processing module 24 is also connected to the depth monitoring module 25 to analyze whether the well depth has reached the preset depth and whether the locking time has reached the preset time, and sends the analysis results to the upper power module 1 and the lower power module 23.

[0044] The analysis results specifically include whether the preset depth was reached, whether the preset depth was not reached, whether the preset monitoring time was reached, and whether the preset monitoring time was not reached. The following is a detailed analysis of each situation.

[0045] When the preset depth is reached or the monitoring time is not reached, a power disconnect command is sent to the upper power module 1 and a power disconnect (i.e., power off) command is sent to the lower power module 23. When the upper power is disconnected, the upper spring 10 moves downward, causing the sealing head 15 to move downward and separate from the sealing seat 16, allowing the flow channel 14 to flow, so that the weight of the device itself is greater than the upward thrust of natural gas. When the lower power is disconnected, the lower induction coil has no electromagnetic induction effect, and the lower spring provides an upward elastic force to the lower moving iron core. At this time, the upper movement caused by the elastic force of the lower spring causes the slider to slide left and right, causing the two ends of the transmission rod to move to both sides. The two ends of the transmission rod move to both sides, causing the locking device to extend, thus locking the device. The structural diagram of the locking device when it extends is shown in the figure. Figure 2 As shown.

[0046] Before reaching the preset depth, a power-off command is sent to the upper power module 1 and a power-on command is sent to the lower power module 23. When the upper power is off, the device's own weight is greater than the upward thrust of the natural gas, the principle of which is the same as above and will not be repeated here. When the lower power is on, the electromagnetic induction of the lower induction coil causes the lower fixed iron core to provide a downward attraction to the lower moving iron core. At this time, the lower moving iron core moves downward under the downward attraction, causing the slider to slide left and right, causing the two ends of the transmission rod to move towards the middle. The movement of the two ends of the transmission rod towards the middle causes the locking device to move downward and retract. Furthermore, the device's own weight is greater than the upward thrust of the natural gas, thus causing the device to move downward.

[0047] Upon reaching the preset monitoring time, a power-on (closed) command is sent to the upper power module 1 and a power-on (closed) command is sent to the lower power module 23. When the upper power is closed, the induction coil, due to electromagnetic induction, causes the upper fixed iron core 8 and the upper moving iron core 9 to have opposite magnetic properties. The upper fixed iron core 8 exerts an upward attraction on the upper moving iron core 9, causing the upper moving iron core 9 to move upward. The upward movement of the upper moving iron core 9 causes the sealing head 15 to move upward and contact the sealing seat 16, thereby closing the overcurrent channel 14. The structural diagram when the overcurrent channel is closed is shown in the figure. Figure 3 As shown, this ensures that the device's own weight is less than the upward thrust of the natural gas. Simultaneously, when the lower power supply is closed, as explained above, the locking device will move downwards to retract, and since the device's own weight is less than the upward thrust of the natural gas, the device will move upwards.

[0048] One end of the upper fixed iron core 8 is fixedly installed to the lower end of the data storage module 2 by bolts, and the other end is connected to the upper moving iron core 9 by the upper spring 10. The upper induction coil 11 is connected to the upper power module 2. When the upper power supply is closed, the induction coil causes the upper fixed iron core 8 and the upper moving iron core 9 to have opposite magnetic properties due to electromagnetic induction. The upper fixed iron core 8 generates an upward attraction force on the upper moving iron core 9, providing an upward attraction force for the upper moving iron core 9. The upper moving iron core, located inside the annular structure of the upper induction coil, is also connected to the sealing head 15 of the overcurrent channel module by bolts 13. When the upper power supply is closed, the upper fixed iron core 8 generates an upward attraction force on the upper moving iron core 9, moving upward to contact the sealing seat 16 and close the overcurrent channel 14. It is also used to move downward under the elastic force of the upper spring 10 when the upper power supply is closed, causing the sealing head 15 to move downward and separate from the sealing seat 16, allowing the overcurrent channel 14 to flow. The upper sealing ring 12 is installed at the position where the upper moving iron core and the outer shell are displaced. It is used to prevent gas and liquid from entering the upper electromagnetic module, ensuring the performance of the upper electromagnetic module and improving the service life and performance stability of the device.

[0049] The lower fixed iron core is connected to the lower moving iron core via a lower spring. The lower induction coil is connected to the lower power module. When the lower power supply is closed, the lower induction coil, through electromagnetic induction, causes the lower fixed iron core and the lower moving iron core to have opposite magnetic properties. The lower fixed iron core exerts a downward attractive force on the lower moving iron core, thus providing a downward attractive force for the lower moving iron core. The lower moving iron core, located inside the annular structure of the lower induction coil, is also connected to the slider 20. It moves downward when the lower moving iron core provides a downward attractive force, causing the slider 20 to move horizontally. It also moves upward under the elastic force of the lower spring when the lower power supply is de-energized, causing the locking device to extend.

[0050] The upper induction coil 11 and the lower induction coil are encased in a non-metallic shell to prevent interference with the electromagnetic effect, thereby ensuring the self-movement and self-locking state of the device and improving the stability of the device.

[0051] A sealing seat 16 is located directly above the sealing head 15 and is fixedly installed on the inner wall of the housing. The sealing head is connected to the lower end of the upper moving iron core 9. It moves upward to contact the sealing seat when the upper moving iron core 9 moves upward, thus closing the flow passage 14. It also moves downward to separate from the sealing seat when the upper moving iron core 9 moves downward, allowing the flow passage to circulate. An inner passage is formed on both sides of the sealing head, positioned vertically opposite the sealing seat, and is used for natural gas to flow into the flow passage. The flow passage is located between the sealing head, sealing seat, and inner passage. It prevents the inflow of natural gas when the flow passage is closed and allows natural gas to flow in when the flow passage is open. Air flowing into the flow passage reduces the upward thrust of the natural gas; when the flow passage is closed, air cannot flow in, thus failing to reduce the upward thrust of the natural gas.

[0052] Both the sealing seat 16 and the sealing head 15 are made of rubber. The maximum outer diameter of the sealing seat 16 is larger than the maximum outer diameter of the sealing head 15. The sealing head is an arc surface, so that when the two come into contact, a complete and closed sealing surface is formed, causing the flow channel to be completely closed, which makes the device move upward.

[0053] The slider 20, connected to the lower moving iron core, is used to slide horizontally when the lower moving iron core moves upward, causing the connection end between the slider 20 and the transmission rod 28 to rotate to both sides, or to slide horizontally when the lower moving iron core moves downward, causing the connection end between the slider 20 and the transmission rod 28 to rotate towards the center. The transmission rod 28, connected to the locking device 17 via a pin 19, is used to rotate towards the center, causing the locking device 17 to move downward, or to rotate to both sides, causing the locking device 17 to move upward. The locking spring 18, connected between the locking devices 17, is used to retract the locking device when the locking device 17 moves downward.

[0054] As described above, the gas well downhole temperature and pressure monitoring device provided in this embodiment of the invention controls the flow through the upper electromagnetic module to ensure that the device's own weight is greater than the upward thrust of natural gas. The lower electromagnetic module controls the locking module to retract its locking device when the power is turned on by the control module, causing the device to move downwards. The lower electromagnetic module also controls the locking module to extend its locking device when the power is turned off by the control module, causing the device to lock at a preset depth during downward movement. Alternatively, the upper electromagnetic module controls the flow through the closed electromagnetic channel to ensure that the device's own weight is less than the upward thrust of natural gas. The lower electromagnetic module controls the locking module to retract its locking device when the power is turned on by the control module, causing the device to move upwards. The lower electromagnetic module also controls the locking module to extend its locking device when the power is turned off by the control module, causing the device to lock at a preset depth during upward movement. This invention enables the self-moving of the gas well downhole temperature and pressure monitoring device, reducing the difficulty of downhole temperature and pressure monitoring. It eliminates the need for equipment such as cables, winches, cranes, blowout preventers, and lubricators, and also reduces the need for multiple professionals for installation and operation, simplifying the downhole temperature and pressure monitoring workflow and lowering time and labor costs. The gas well downhole temperature and pressure monitoring device provided by this invention is wireless, eliminating the need for cables and other maintenance-required equipment, thus reducing maintenance costs.

[0055] To address the above problems, according to one aspect of the present invention, this embodiment discloses a method for monitoring downhole temperature and pressure in gas wells. For example... Figure 4 As shown, the method includes:

[0056] Step 100: Collect and store temperature and pressure data at a preset depth using the gas well downhole temperature and pressure monitoring device described above. The specific structure of the gas well downhole temperature and pressure monitoring device is as described above and will not be repeated here.

[0057] Step 200: In response to the operation of the downhole temperature and pressure monitoring device returning to the wellhead, read the stored temperature and pressure data.

[0058] As described above, the downhole temperature and pressure monitoring method for gas wells provided by this invention enables long-term monitoring of downhole flow temperature and pressure without shutting in the well. After the preset monitoring time, the device can automatically move downwards or upwards by changing the area of ​​the flow channel, making its own weight greater or less than the upward thrust of natural gas, thus adaptively returning to the wellhead for data analysis. The monitoring method implemented through this device eliminates the need for cables, winches, cranes, blowout preventers, and lubricators, and requires fewer professionals for installation and operation, simplifying the downhole temperature and pressure monitoring workflow, reducing time and labor costs, and enabling more efficient and accurate acquisition of downhole temperature and pressure parameters. This provides reliable data support for dynamic monitoring and process optimization of natural gas well production.

[0059] In some implementations, such as Figure 5 As shown, step 100 includes:

[0060] Step 101: In response to the completion of initialization of preset parameters and the deployment of the downhole temperature and pressure wireless monitoring device from the wellhead, stop supplying power to the upper electromagnetic module and continue supplying power to the lower electromagnetic module. The preset parameters include preset depth, preset monitoring time, and preset monitoring frequency for temperature and pressure data. These parameters can be set according to the actual application scenario and are not limited here.

[0061] The temperature and pressure sensors collect temperature and pressure data at a preset monitoring frequency, recording as much data as possible while reducing the power consumption of the power module.

[0062] Step 102: The upper electromagnetic module controls the flow channel module to form a flowing flow channel, so that natural gas enters the flowing flow channel and reduces the upward thrust of natural gas.

[0063] The principle is as follows: When the upper power is disconnected, the upper spring 10 moves downward, causing the sealing head 15 to move downward and separate from the sealing seat 16 so that the flow channel 14 can flow, allowing the production gas to enter the device through the inner channel. Because all the flow channels of the device are unobstructed, the weight of the device itself is greater than the upward thrust of the natural gas.

[0064] Step 103: The lower electromagnetic module drives the locking module to retract, and the locking device control device moves downward. The principle is as follows: When the lower power is closed, the lower electromagnetic module is energized. The electromagnetic induction of the lower induction coil causes the lower stationary iron core to provide a downward attraction to the lower moving iron core. At this time, the lower moving iron core moves downward under the downward attraction, causing the slider to slide left and right, which causes the two ends of the transmission rod to move towards the middle. The movement of the two ends of the transmission rod towards the middle causes the locking device to move downward and retract, so that the monitoring device continues to fall.

[0065] Step 104: The depth monitoring module determines the well depth based on the collected depth data and sends it to the data processing module.

[0066] Specifically, the device detects tubing coupling signals (signals emitted at the connection points between tubing sections, which can be used to identify the connection point) by operating an eddy current sensor in the tubing, and compares these signals with actual tubing string data (number of tubing sections and length of tubing sections) to obtain the well depth of the device, which is then sent to the data processing module.

[0067] Step 105: The data processing module determines whether the preset depth has been reached based on the well depth. If yes, proceed to step 106; otherwise, proceed to step 104.

[0068] Step 106: Disconnect the lower power module.

[0069] Step 107: The lower electromagnetic module drives the locking module to extend out and be fixed by the locking device control device.

[0070] Specifically: When the power supply is disconnected, the lower induction coil has no electromagnetic induction effect. The lower spring provides an upward elastic force to the lower moving iron core. At this time, the upper movement caused by the elastic force of the lower spring drives the slider to slide left and right, causing the two ends of the transmission rod to move to both sides. The movement of the two ends of the transmission rod to both sides causes the locking device to extend, thus locking the device.

[0071] Step 108: The temperature and pressure monitoring module collects the temperature and pressure data of the natural gas and sends them to the data storage module for storage.

[0072] Step 109: The data processing module determines whether the monitoring time has reached the preset monitoring time. If yes, proceed to step 110; otherwise, proceed to step 108.

[0073] Step 110: Continue to supply power to the upper electromagnetic module and stop supplying power to the lower electromagnetic module.

[0074] Step 111: The upper electromagnetic module drives the flow channel module to move upward, forming a closed flow channel, thus preventing natural gas from entering the flowing flow channel. Specifically: When the upper power supply is closed, the induction coil, due to electromagnetic induction, causes the upper fixed iron core 8 and the upper moving iron core 9 to have opposite magnetic properties. The upper fixed iron core 8 generates an upward attraction on the upper moving iron core 9, causing the upper moving iron core 9 to move upward. The upward movement of the upper moving iron core 9 causes the sealing head 15 to move upward and contact the sealing seat 16, thereby closing the flow channel 14, preventing natural gas from entering the flowing flow channel, and making the weight of the device itself less than the upward thrust of the natural gas.

[0075] Step 112: The lower electromagnetic module drives the locking module to extend and the locking device control device moves upward. Specifically, when the lower power is disconnected, the lower induction coil has no electromagnetic induction effect. The lower spring provides an upward elastic force to the lower moving iron core. At this time, the upper movement caused by the elastic force of the lower spring drives the slider to slide left and right, causing the two ends of the transmission rod to move to both sides. The movement of the two ends of the transmission rod to both sides causes the locking device to extend and lock the device.

[0076] Repeat steps 104 and 112 until temperature and pressure data are collected and stored at all preset depths, and then return to the wellhead.

[0077] As described above, the downhole temperature and pressure monitoring method for gas wells provided by this invention enables long-term monitoring of downhole flow temperature and pressure without shutting in the well. After the preset monitoring time, the device can automatically move downwards or upwards by changing the area of ​​the flow channel, making its own weight greater or less than the upward thrust of natural gas, thus adaptively returning to the wellhead for data analysis. The monitoring method implemented through this device eliminates the need for cables, winches, cranes, blowout preventers, and lubricators, and requires fewer professionals for installation and operation, simplifying the downhole temperature and pressure monitoring workflow, reducing time and labor costs, and enabling more efficient and accurate acquisition of downhole temperature and pressure parameters. This provides reliable data support for dynamic monitoring and process optimization of natural gas well production.

[0078] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0079] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0080] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A gas well downhole temperature and pressure monitoring device, characterized in that, The device includes a control module, an electromagnetic module, a depth monitoring module, a flow channel module, a locking module, and a temperature and pressure monitoring module; wherein, the flow channel module includes a flow channel; The depth monitoring module is used to monitor depth data, determine the well depth based on the depth data, and send it to the control module. The temperature and pressure monitoring module is connected to the control module, and the temperature and pressure monitoring module is used to collect temperature data and pressure data and send them to the control module. The control module is connected to the electromagnetic module, the depth monitoring module and the temperature and pressure monitoring module respectively, and is used to store the temperature data and the pressure data, and also to supply power to the electromagnetic module, the depth monitoring module and the temperature and pressure monitoring module according to the opening or closing of the well depth control power supply; The upper electromagnetic module of the electromagnetic module is connected to the control module and the overcurrent channel module respectively. It is used to control the overcurrent channel to flow so that the whole device moves downward when the power is disconnected by the control module, or to control the overcurrent channel to close so that the whole device moves upward when the power is closed by the control module. The lower electromagnetic module of the electromagnetic module is connected to the control module and the locking module respectively. It is used to control the locking module to extend the locking device to lock the device when the power is disconnected by the control module, or to control the locking module to retract the locking device to move the device when the power is closed by the control module.

2. The monitoring device as described in claim 1, characterized in that, The control module includes an upper power module, a lower power module, a data storage module, and a data processing module; The upper power module is connected to the upper electromagnetic module, the temperature and pressure monitoring module, the data processing module, and the data storage module, and is used to supply power to the upper electromagnetic module, the temperature and pressure monitoring module, and the data storage module; The lower power module is connected to the data processing module, the depth monitoring module and the lower electromagnetic module, and is used to supply power to the data processing module, the depth monitoring module and the lower electromagnetic module; The data storage module is also connected to the upper electromagnetic module and the temperature and pressure monitoring module, and is used to store the temperature data and pressure data collected by the temperature and pressure monitoring module. The data processing module is also connected to the depth monitoring module, and is used to analyze whether the well depth has reached the preset depth and whether the locking time has reached the preset monitoring time, and send the analysis results to the power module so that the power module can be closed or opened.

3. The monitoring device as described in claim 2, characterized in that, If the analysis result indicates that a preset depth has been reached, the upper power module and the lower power module are disconnected. If the analysis result indicates that the preset depth has not been reached, the upper power module is disconnected and the lower power module is closed. If the analysis result indicates that the preset depth has been reached or the preset monitoring time has not been reached, the upper power module and the lower power module will be disconnected. If the analysis result indicates that the preset monitoring time has been reached, the upper power module and the lower power module will be closed.

4. The monitoring device as described in claim 2, characterized in that, The upper electromagnetic module includes an upper spring, an upper fixed iron core, an upper moving iron core, and an upper induction coil; One end of the upper fixed iron core is fixedly installed at the lower end of the data storage module, and the other end is connected to the upper moving iron core through the upper spring; The upper induction coil is connected to the upper power module and is used to provide an upward attractive force to the lower moving iron core when the upper power supply is powered. The upper moving iron core is located inside the annular structure of the upper induction coil and is also connected to the overcurrent channel module. It is used to move upward to close the overcurrent channel when the upper power supply provides an upward attractive force, and to move downward to allow the overcurrent channel to flow when the upper power supply is de-energized by the elastic force of the upper spring.

5. The monitoring device as described in claim 2, characterized in that, The lower electromagnetic module includes a lower spring, a lower moving iron core, a lower fixed iron core, and a lower induction coil; The lower fixed iron core is connected to the lower moving iron core through the lower spring; The lower induction coil is connected to the lower power module and is used to provide a downward attractive force to the lower moving iron core when the lower power supply is powered. The lower moving iron core is located inside the annular structure of the lower induction coil and is also connected to the locking module. It is used to move downward to drive the locking module to retract into the locking device when the lower power supply provides downward attraction. It is also used to move upward to drive the locking module to extend out of the locking device through the elastic force of the lower spring when the lower power supply is de-energized.

6. The monitoring device as described in claim 4, characterized in that, The device also includes a housing, inside which the control module, the electromagnetic module, the depth monitoring module, and the temperature and pressure monitoring module are installed for protection.

7. The monitoring device as described in claim 6, characterized in that, The flow channel module also includes a sealing head, a sealing seat, and an inner channel; The sealing seat is located directly above the sealing head and is fixedly installed on the inner wall of the outer shell; The sealing head is connected to the lower end of the upper moving iron core and is used to move upward to contact the sealing seat when the moving iron core moves upward to close the flow channel. It is also used to move downward to separate from the sealing seat when the moving iron core moves downward to allow the flow channel to flow. The inner channel is located on both sides of the sealing head and is positioned vertically opposite to the sealing seat, for natural gas to flow into the flow channel; The flow passage is located between the sealing head, the sealing seat, and the inner channel, and is used to prevent the inflow of natural gas when the flow passage is closed, and also to allow natural gas to flow in when the flow passage is open.

8. The monitoring device as described in claim 7, characterized in that, The sealing seat and the sealing head are made of rubber. The maximum outer diameter of the sealing seat is larger than the maximum outer diameter of the sealing head. The sealing head has an arc surface.

9. The monitoring device as described in claim 2, characterized in that, The locking module includes a locking spring, a slider, a transmission rod, and a locking device; The slider is connected to the lower moving iron core and is used to drive the slider to slide horizontally for the first time when the lower moving iron core moves upward, thereby driving the transmission rod and the slider connection end to rotate to both sides. It is also used to drive the slider to slide horizontally for the second time when the lower moving iron core moves downward, thereby driving the transmission rod and the slider connection end to rotate towards the middle. The transmission rod is connected to the locking device via a shaft pin, and is used to rotate to both sides at the connection end between the transmission rod and the slider to drive the locking device to move upward, or it is also used to rotate to the middle at the connection end between the transmission rod and the slider to drive the locking device to move downward. The locking spring is connected between the locking devices and is used to retract the locking devices when the transmission rod rotates and drives the locking devices to move downward.

10. The monitoring device as described in claim 6, characterized in that, The upper electromagnetic module also includes an upper sealing ring, which is installed at the position where the upper moving iron core and the outer shell are displaced, to prevent gas and liquid from entering the upper electromagnetic module.

11. The monitoring device as described in claim 1, characterized in that, The depth monitoring module includes an eddy current sensor.

12. The monitoring device as described in claim 1 or 6, characterized in that, The depth monitoring module includes a depth monitoring shell to protect the collected eddy current signals from interference.

13. The monitoring device as described in claim 1, characterized in that, The temperature and pressure monitoring module includes temperature and pressure sensors.

14. A method for monitoring downhole temperature and pressure in a gas well, characterized in that, The method includes: The gas well downhole temperature and pressure monitoring device collects and stores temperature and pressure data at a preset depth, and the gas well downhole temperature and pressure monitoring device is the device as described in any one of claims 1 to 13. In response to the operation of the gas well downhole temperature and pressure monitoring device returning to the wellhead, the stored temperature data and pressure data are read.

15. The monitoring method as described in claim 14, characterized in that, The gas well downhole temperature and pressure monitoring device collects and stores temperature and pressure data at a preset depth, including: Step 101: In response to the completion of the initialization of preset parameters, stop supplying power to the upper electromagnetic module and continue supplying power to the lower electromagnetic module, wherein the preset parameters include preset depth and preset monitoring time; Step 102: The upper electromagnetic module controls the flow channel module to form a flowing flow channel, so that natural gas enters the flowing flow channel and reduces the upward thrust of natural gas; Step 103: The lower electromagnetic module drives the locking module to retract the locking device, controlling the device to move downwards; Step 104: The depth monitoring module determines the well depth based on the collected depth data and sends it to the data processing module; Step 105: The data processing module determines whether the well depth has reached the preset depth. If yes, it executes step 106; otherwise, it executes step 104. Step 106: Disconnect the lower power module; Step 107: The lower electromagnetic module drives the locking module to extend from the locking device to control the device to be fixed; Step 108: The temperature and pressure monitoring module collects the temperature and pressure data of the natural gas and sends them to the data storage module for storage; Step 109: The data processing module determines whether the monitoring time has reached the preset monitoring time. If yes, proceed to step 110; otherwise, proceed to step 108. Step 110: Continue supplying power to the upper electromagnetic module and stop supplying power to the lower electromagnetic module; Step 111: The upper electromagnetic module drives the flow channel module to move upward to form a closed flow channel, so that natural gas cannot enter the flowing flow channel; Step 112: The lower electromagnetic module drives the locking module to extend out of the locking device, controlling the device to move upward; Repeat steps 104 and 112 until temperature and pressure data are collected and stored at all preset depths, and then return to the wellhead.

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