Gas well underground temperature and pressure monitoring device and method

Abstract

The invention provides a gas well downhole temperature and pressure monitoring device and method. The device comprises a depth monitoring module used for monitoring depth data, determining the well depth and sending the depth data and the well depth to a control module; the temperature and pressure monitoring module is connected with the control module and used for collecting temperature data and pressure data and sending the data to the control module. The control module is connected with the electromagnetic module, the depth monitoring module and the temperature and pressure monitoring module and used for storing the temperature data and the pressure data and supplying power to the electromagnetic module, the depth monitoring module and the temperature and pressure monitoring module according to switching-on or switching-off of a well depth control power source. The upper electromagnetic module of the electromagnetic module is connected with the control module and the overflowing channel module and used for controlling the overflowing channel to circulate when a power source is switched off or controlling the overflowing channel to be closed when the power source is switched on, and the lower electromagnetic module of the electromagnetic module is connected with the control module and the clamping module. The control module is used for controlling the clamping module to stretch out when the power supply is switched off or controlling the clamping module to retract when the power supply is switched on.

Description

Technical Field

[0001] The present invention relates to the technical field of gas well exploitation, and further to the technical field of gas well production dynamic monitoring, and in particular to a gas well downhole temperature and pressure monitoring device and method. Background Art

[0002] During the natural gas extraction process, different gas extraction process measures need to be taken to maximize production benefits. As the extraction progresses, the environment and conditions downhole will continue to change. Therefore, in order to be able to adjust and optimize process parameters in a timely manner, it is necessary to continuously monitor the production dynamics of the gas well to improve the gas field recovery rate. Among them, downhole temperature and pressure, as one of the core parameters to be monitored, are an important basis for guiding the rational extraction of gas wells.

[0003] At present, the following three methods are commonly used to measure downhole temperature and pressure: 1. Place permanent pressure sensors for monitoring; 2. Lower the trailer together with the pressure sensor, and take out the sensor for data reading after a period of time; 3. Lower the cable or optical fiber, equipped with a direct-reading pressure sensor for dynamic monitoring. However, the above three monitoring methods all require the use of equipment such as cables, winches and cranes. In addition, they also require matching blowout preventers, lubricators and multiple professionals for installation and operation, which increases the complexity, time cost and labor cost of the operation. Moreover, due to the harsh downhole environment, cables, permanent sensors, etc. require reliable performance or continuous maintenance, which increases maintenance costs. In summary, the existing monitoring methods are costly. Summary of the invention

[0004] The first object of the present invention is to provide a gas well downhole temperature and pressure monitoring device and method, which simplifies the operation process of downhole temperature and pressure monitoring and reduces time cost and labor cost. The gas well downhole temperature and pressure monitoring device provided by the present invention is a wireless device, which does not require equipment such as cables that need to be maintained, thereby reducing maintenance costs.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] In the first aspect, the present invention discloses a gas well downhole temperature and pressure monitoring device, 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 is used to monitor depth data, determine the well depth according to 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 respectively connected to the electromagnetic module, the depth monitoring module and the temperature and pressure monitoring module, for storing the temperature data and the pressure data, and also for controlling the closing or disconnection of a power supply according to the well depth to obtain the desired temperature data and pressure data. 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 respectively connected to the control module and the flow channel module, and is used to control the flow of the flow channel to move the device downward as a whole according to the control module disconnecting the power supply, or to control the closing of the flow channel to move the device upward as a whole according to the control module closing the power supply; the lower electromagnetic module of the electromagnetic module is respectively connected to the control module and the locking module, and is used to control the locking module to extend the locking device to lock the device according to the control module controlling the power supply to disconnect, or to control the locking module to retract the locking device to move the device according to the control module controlling the power supply to close.

[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 power 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 power 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 a preset depth and whether the stuck time has reached a preset monitoring time, and send the analysis results to the power module to close or disconnect the power module.

[0008] Optionally, if the analysis result is that the preset depth is not reached, the upper power module is disconnected and the lower power module is closed; if the analysis result is that the preset depth is reached or the preset monitoring time is not reached, the upper power module is disconnected and the lower power module is disconnected; if the analysis result is that the preset monitoring time is 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 mounted on the lower end of the data storage module, and the other end is connected to the upper moving iron core through an upper spring; the upper induction coil is connected to the upper power supply module, and is used to provide an upward attraction to the lower moving iron core when the upper power supply is powered; the upper moving iron core is located inside the ring shape of the upper induction coil, and is also connected to the overcurrent channel module, and is used to move upward to drive the overcurrent channel to close when providing an upward attraction when the upper power supply is powered, and is also used to move downward through the elastic force of the upper spring to drive the overcurrent channel to flow when the upper power supply is powered off.

[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 upper power supply module and to the lower moving iron core through the lower spring; the lower induction coil is connected to the lower power supply module, and is used to provide a downward attraction to the lower moving iron core when the lower power supply is powered; the lower moving iron core is located inside the ring shape of the lower induction coil, and is also connected to the locking module, and is used to move downward to drive the locking module to retract the locking device when the lower power supply provides a downward attraction when the lower power supply is powered, and is also used to move upward through the elastic force of the lower spring to drive the locking module to extend the locking device when the lower power supply is powered off.

[0011] Optionally, the gas well downhole temperature and pressure monitoring device provided by the present invention also includes a shell, in 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 mounted 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 and contact the sealing seat when the moving iron core moves upward to close the flow channel, and is also used to move downward and 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 and is in a relative position to the sealing seat in the upper and lower positions, 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 is also used to allow natural gas to flow into the flow channel when the flow channel is flowing.

[0013] Optionally, the sealing seat and the sealing head are made of rubber material, the maximum outer diameter of the sealing seat is greater than the maximum outer diameter of the sealing head, and the sealing head is a curved 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 first horizontally 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 second horizontally when the lower moving iron core moves downward, thereby driving the transmission rod and the slider connection end to rotate toward the middle; the transmission rod is connected to the locking device through an axle pin, and is used to rotate the transmission rod and the slider connection end to both sides to drive the locking device to move upward, or is also used to rotate the transmission rod and the slider connection end toward the middle to drive the locking device to move downward; the locking spring is connected between the locking devices, and is used to retract the locking device through the locking spring 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 a position where the upper moving iron core and the housing are displaced, and is used 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 outer side of the depth monitoring module includes a depth monitoring housing for protecting the collected eddy current signal from interference.

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

[0019] In a second aspect, the present invention discloses a method for monitoring downhole temperature and pressure of a gas well, the method comprising: collecting temperature data and pressure data at a preset depth by the above-mentioned downhole temperature and pressure monitoring device of the gas well, and storing them; in response to the operation of the downhole temperature and pressure monitoring device of the gas well returning to the wellhead, reading the stored temperature data and pressure data.

[0020] Optionally, the gas well downhole temperature and pressure monitoring device collects temperature data and pressure data at a preset depth and stores the data, including: step 101: in response to the operation of initializing preset parameters, stop powering the upper electromagnetic module and continue powering 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 flow channel so that natural gas enters the flow channel to reduce the upward thrust of the natural gas; step 103: the lower electromagnetic module drives the locking module to retract the locking device to control the downward movement of the device; step 104: the depth monitoring module determines the well depth according to the collected depth data and sends it to the data processing module; step 105: the data processing module determines whether the well depth reaches the preset depth, if so, executes step 106, if not, 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 data 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 reaches the preset monitoring time. If so, execute step 110, if not, execute step 108; Step 110: Continue to power the upper electromagnetic module and stop powering 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 the natural gas cannot enter the circulating 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 the temperature data 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 by the embodiment of the present invention controls the flow of the flow channel through the upper electromagnetic module of the electromagnetic module so that the gravity of the device itself is greater than the upward thrust of the natural gas, and the lower electromagnetic module of the electromagnetic module is used to control the locking module to retract the locking device according to the control module to control the power on so that the device moves downward, and the lower electromagnetic module of the electromagnetic module is also used to control the locking module to extend the locking device according to the control module to control the power off so that the device is locked when it reaches a preset depth during the downward movement. Or the upper electromagnetic module of the electromagnetic module controls the closing of the flow channel so that the gravity of the device itself is less than the upward thrust of the natural gas, and the lower electromagnetic module of the electromagnetic module is used to control the locking module to retract the locking device according to the control module to control the power on so that the device moves upward, and the lower electromagnetic module of the electromagnetic module is also used to control the locking module to extend the locking device according to the control module to control the power off so that the device is locked when it reaches a preset depth during the upward movement. Thus, the gas well downhole temperature and pressure monitoring device can be moved automatically, and the difficulty of gas well downhole temperature and pressure monitoring is reduced. There is no need to use cables, winches, cranes, blowout preventers, lubricators and other equipment, and there is no need for multiple professionals to install and operate, which simplifies the operation process of downhole temperature and pressure monitoring and reduces time and labor costs. The gas well downhole temperature and pressure monitoring device provided by the present invention is a wireless device, which does not require equipment such as cables that need to be maintained, thereby reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

[0024] Figure 2 A schematic diagram showing 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 A schematic diagram showing the structure of a gas well downhole temperature and pressure monitoring device of the present invention when the flow passage is closed;

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

[0027] Figure 5 A flow chart of step 100 of the present invention is shown. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In view of the problems existing in the measurement of downhole temperature and pressure in the prior art, the present invention proposes a downhole temperature and pressure monitoring device for a gas well, which 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 the 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, and the lower end of the temperature and pressure monitoring module is connected to the temperature and pressure conduction channel, which is used to collect the temperature data and pressure data of the natural gas in the temperature and pressure conduction 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, and is used to store the temperature data and pressure data collected by the temperature and pressure monitoring module. It is also used to control the power supply on or off according to the well depth to power the electromagnetic module, depth monitoring module and temperature and pressure monitoring module.

[0033] The upper electromagnetic module of the electromagnetic module is respectively connected to the control module and the overcurrent channel module, and is used to control the overcurrent channel to flow according to the control module disconnecting the power supply so that the device as a whole moves downward, or to control the overcurrent channel to close according to the control module closing the power supply so that the device as a whole moves upward. The lower electromagnetic module of the electromagnetic module is respectively connected to the control module and the locking module, and is used to control the locking module to extend the locking device to lock the device according to the control module controlling the power supply to disconnect, or to control the locking module to retract the locking device to move the device according to the control module controlling the power supply to turn on.

[0034] The upper electromagnetic module of the electromagnetic module controls the flow of the flow channel so that the gravity of the device itself is greater than the upward thrust of the natural gas, and the lower electromagnetic module of the electromagnetic module is used to control the locking module to retract the locking device according to the control module to control the power on so that the device moves downward, and the lower electromagnetic module of the electromagnetic module is also used to control the locking module to extend the locking device according to the control module to control the power off so that the device is locked when it reaches a preset depth during the downward movement. Or the upper electromagnetic module of the electromagnetic module controls the closing of the flow channel so that the gravity of the device itself is less than the upward thrust of the natural gas, and the lower electromagnetic module of the electromagnetic module is used to control the locking module to retract the locking device according to the control module to control the power on so that the device moves upward, and the lower electromagnetic module of the electromagnetic module is also used to control the locking module to extend the locking device according to the control module to control the power off so that the device is locked when it reaches a preset depth during the upward movement.

[0035] It can be seen from the above content that the gas well downhole temperature and pressure monitoring device provided by the present invention realizes the self-movement of the gas well downhole temperature and pressure monitoring device, reduces the difficulty of gas well downhole temperature and pressure monitoring, does not need to use cables, winches, cranes, blowout preventers and lubricators and other equipment, and does not need multiple professionals to install and operate, simplifies the operation process of downhole temperature and pressure monitoring, and reduces time and labor costs. The gas well downhole temperature and pressure monitoring device provided by the present invention is a wireless device, does not require cables and other equipment that requires maintenance, and reduces maintenance costs.

[0036] In some embodiments, the device further comprises a housing, and a control module, an electromagnetic module, a depth monitoring module and a temperature and pressure monitoring module are installed inside the housing to protect the control module, the electromagnetic module, the depth monitoring module and the temperature and pressure monitoring module. In this way, there is no need for equipment such as cables that require maintenance of the monitoring device, which reduces maintenance costs, thereby reducing the cost of downhole temperature and pressure monitoring of gas wells. Among them, the material of the housing can be PEEK material, so as to better protect the internal module from the influence of the downhole environment, increase the service life and reduce the difficulty of temperature and pressure monitoring, so that rich downhole temperature and pressure data can be collected.

[0037] In some embodiments, Figure 1 As shown, the control module includes an upper power module 1, a lower power 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 outer side of the depth monitoring module 25 includes a depth monitoring housing 26, which is used to protect the collected eddy current signal from interference, thereby ensuring the safety and accuracy of the data collected by the device, wherein the material of the depth monitoring housing 26 can be PEEK material, thereby better protecting the collected eddy current signal from interference. The fixing device 17 can be a fixing device. The temperature and pressure monitoring module 3 includes a temperature and pressure sensor, and the housing is provided with a conduction channel 4, and the conduction channel 4 is at the lower end of the temperature and pressure monitoring module, so that the downhole flow temperature and pressure can be directly conducted to the temperature and pressure sensor, thereby accurately obtaining temperature data and pressure data and recording them.

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

[0040] The lower power module 23 is connected to the data processing module 24, the depth monitoring module 25 and the lower induction coil of the lower electromagnetic module 21, and is used to power the data processing module 24, the depth monitoring module 25 and the lower electromagnetic module 21. Specifically, the lower end of the lower power module 23 is connected to the data processing module 24 and the data processing module 24 respectively, 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 protect the lower power module.

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

[0042] The first sealing ring 6 is arranged on both sides of the temperature and pressure monitoring module 3 to protect the temperature and pressure monitoring module from the external environment and prolong the service life. A wire passage 5 is arranged on one side of the temperature and pressure monitoring module, and the wire passage 5 is used for the connection wires of each module to pass through, so as to facilitate the 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 a preset depth and whether the locking time has reached a preset time, and send the analysis results to the upper power module 1 and the lower power module 23.

[0044] The analysis results specifically include reaching the preset depth, not reaching the preset depth, reaching the preset monitoring time, and not reaching the preset monitoring time. 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 instruction is sent to the upper power module 1 and a power disconnect (i.e., power off) instruction is sent to the lower power module 23. When the upper power is disconnected, the sealing head 15 moves downward under the elastic force of the upper spring 10, and moves downward to separate from the sealing seat 16 to allow the flow channel 14 to flow, so that the device's own gravity is greater than the upward thrust of the 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, it moves upward under the elastic force of the lower spring, driving the slider to slide left and right, so that the two ends of the transmission rod move to both sides. The two ends of the transmission rod move to both sides and drive the locking device to extend, so that the device is locked. The structural diagram when the locking device is extended is shown as follows. Figure 2 shown.

[0046] When the preset depth is not reached, a power disconnection instruction is sent to the upper power module 1 and a power closing (i.e. power-on) instruction is sent to the lower power module 23. When the upper power is disconnected, the device's own gravity is greater than the upward thrust of natural gas. The principle is the same as above and will not be repeated here. When the lower power is closed, 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 action of the downward attraction, driving the slider to slide left and right so that the two ends of the transmission rod move toward the middle. The movement of the two ends of the transmission rod toward the middle drives the fixing device to move downward and thus retract, and the device's own gravity is greater than the upward thrust of natural gas, thereby causing the device to move downward.

[0047] When the preset monitoring time is reached, a closing (i.e., power-on) power command is sent to the upper power module 1 and a closing (i.e., power-on) power command is sent to the lower power module 23. When the upper power is closed, the induction coil makes the upper fixed iron core 8 and the upper moving iron core 9 have opposite magnetic properties due to the effect of electromagnetic induction. The upper fixed iron core 8 generates an upward attraction to the upper moving iron core 9, driving the upper moving iron core 9 to move upward. The upper moving iron core 9 moves upward and drives the sealing head 15 to move upward and contact the sealing seat 16 to close the flow channel 14. The structural schematic diagram when the flow channel is closed is shown in FIG. Figure 3 As shown, the weight of the device itself is smaller than the upward thrust of natural gas. At the same time, when the lower power supply is closed, the above principle shows that the locking device will be driven to move downward and retracted, and the weight of the device itself is smaller than the upward thrust of natural gas, so that the device moves upward.

[0048] One end of the upper fixed iron core 8 is fixedly installed on 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, and is used for the induction coil to make the upper fixed iron core 8 and the upper moving iron core 9 have opposite magnetic properties due to the effect of electromagnetic induction when the upper power is closed and powered, and the upper fixed iron core 8 generates an upward attraction to the upper moving iron core 9, providing an upward attraction for the upper moving iron core 9. The upper moving iron core, located inside the ring of the upper induction coil, is also connected to the sealing head 15 of the flow channel module by bolts 13, and is used for moving upward when the upper fixed iron core 8 generates an upward attraction to the upper moving iron core 9 when the upper power is closed and powered, driving the sealing head 15 to move upward and contact with the sealing seat 16 to close the flow channel 14, and is also used for moving downward under the elastic force of the upper spring 10 when the upper power is disconnected and stopped, driving the sealing head 15 to move downward and separate from the sealing seat 16 to allow the flow of the flow channel 14. The upper sealing ring 25 is installed at the position where the upper moving iron core and the housing are displaced to prevent gas and liquid from entering the upper electromagnetic module, thereby ensuring the performance of the upper electromagnetic module and improving the service life of the device and the stability of its performance.

[0049] The lower fixed iron core is connected to the upper power module and the lower moving iron core through the lower spring. The lower induction coil is connected to the lower power module, and is used for the lower induction coil to make the lower fixed iron core and the lower moving iron core have opposite magnetism according to the effect of electromagnetic induction when the lower power is closed and powered, and the lower fixed iron core has a downward attraction to the lower moving iron core, thereby providing a downward attraction for the lower moving iron core. The lower moving iron core, located inside the ring of the lower induction coil, is also connected to the slider 20, and is used to move downward when the lower moving iron core provides a downward attraction to drive the slider 20 to move horizontally. It is also used to move upward under the elastic force of the lower spring when the lower power is turned off to drive the locking device to extend.

[0050] The upper induction coil 11 and the lower induction coil are wrapped by a non-metallic shell to prevent the electromagnetic effect from being affected, thereby ensuring the self-movement and self-locking state of the device, thereby improving the stability of the device.

[0051] The sealing seat 16 is located just above the sealing head 15 and is fixedly mounted on the inner wall of the housing. The sealing head is connected to the lower end of the upper moving iron core 9, and is used to move upward and contact the sealing seat when the upper moving iron core 9 moves upward to close the flow channel 14, and is also used to move downward and separate from the sealing seat when the upper moving iron core 9 moves downward to allow the flow channel to flow. The inner channel is opened on both sides of the sealing head and is in a relative position with the sealing seat up and down, 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 is also used to allow natural gas to flow into the flow channel when it is flowing. The inflow of air into the flow channel can reduce the upward thrust of the natural gas. When the flow channel is closed, air cannot flow into it, thereby failing to reduce the upward thrust of the natural gas.

[0052] Among them, the sealing seat 16 and the sealing head 15 are both made of rubber material, the maximum outer diameter of the sealing seat 16 is larger than the maximum outer diameter of the sealing head 15, and the sealing head is an arc surface, so that when the two are in contact, a complete and closed sealing surface is formed, causing the flow channel to be completely closed, allowing the device to move upward.

[0053] The slider 20 is connected to the lower movable iron core, and is used to slide horizontally when the lower movable iron core moves upward, driving the connecting end of the transmission rod 28 and the slider 20 to rotate to both sides, or to slide horizontally when the lower movable iron core moves downward, driving the connecting end of the transmission rod 28 and the slider 20 to rotate toward the middle. The transmission rod 28 is connected to the locking device 17 through the pin 19, and is used to drive the locking device 17 to move downward when the transmission rod 28 rotates toward the middle, or to drive the locking device 17 to move upward when the transmission rod 28 rotates to both sides. The locking spring 18 is connected between the locking devices 17, and is used to retract the locking device through the locking spring 18 when the locking device 17 moves downward.

[0054] It can be seen from the above contents that the gas well downhole temperature and pressure monitoring device provided by the embodiment of the present invention controls the flow of the flow channel through the upper electromagnetic module of the electromagnetic module so that the gravity of the device itself is greater than the upward thrust of the natural gas, and the lower electromagnetic module of the electromagnetic module is used to control the locking module to retract the locking device according to the control module to control the power on so that the device moves downward, and the lower electromagnetic module of the electromagnetic module is also used to control the locking module to extend the locking device according to the control module to control the power off so that the device is locked when it reaches a preset depth during the downward movement. Or the upper electromagnetic module of the electromagnetic module controls the closing of the flow channel so that the gravity of the device itself is less than the upward thrust of the natural gas, and the lower electromagnetic module of the electromagnetic module is used to control the locking module to retract the locking device according to the control module to control the power on so that the device moves upward, and the lower electromagnetic module of the electromagnetic module is also used to control the locking module to extend the locking device according to the control module to control the power off so that the device is locked when it reaches a preset depth during the upward movement. Thus, the gas well downhole temperature and pressure monitoring device can be moved automatically, and the difficulty of gas well downhole temperature and pressure monitoring is reduced. There is no need to use cables, winches, cranes, blowout preventers, lubricators and other equipment, and there is no need for multiple professionals to install and operate, which simplifies the operation process of downhole temperature and pressure monitoring and reduces time and labor costs. The gas well downhole temperature and pressure monitoring device provided by the present invention is a wireless device, which does not require equipment such as cables that need to be maintained, thereby reducing maintenance costs.

[0055] In order to solve the above problems, according to one aspect of the present invention, this embodiment discloses a method for monitoring downhole temperature and pressure of a gas well. Figure 4 As shown, the method includes:

[0056] Step 100: The temperature data and pressure data at the preset depth are collected and stored by the gas well downhole temperature and pressure monitoring device. The specific structure of the gas well downhole temperature and pressure monitoring device is as described above and will not be described again here.

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

[0058] From the above content, it can be known that the gas well downhole temperature and pressure monitoring method provided by the present invention can realize long-term monitoring of downhole flow temperature and pressure without shutting down the well, and after the preset monitoring time, it can change the area of ​​the flow channel so that the device's own gravity is greater than or less than the upward thrust of the natural gas, and then it can automatically move downward or upward, and adaptively return to the wellhead to facilitate personnel to analyze data. The monitoring method implemented by the above monitoring equipment does not require the use of cables, winches, cranes, blowout preventers, lubricators and other equipment, and does not require multiple professionals to install and operate, which simplifies the operation process of downhole temperature and pressure monitoring, reduces time and labor costs, and can more efficiently and accurately obtain downhole temperature and pressure parameters, providing reliable data support for dynamic monitoring of natural gas well production and process optimization.

[0059] In some embodiments, Figure 5 As shown, step 100 includes:

[0060] Step 101: In response to the completion of initializing preset parameters and the operation of launching 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 of temperature and pressure data. The preset depth, preset monitoring time, and preset monitoring frequency of temperature and pressure data 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, reducing the energy consumption of the power module while recording as much data as possible.

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

[0063] The principle is as follows: when the upper power supply is disconnected, the elastic force of the upper spring 10 moves downward, driving the sealing head 15 to move downward and separate from the sealing seat 16 to allow the flow channel 14 to flow, allowing the production gas to enter the device through the inner channel. Since all the flow channels of the device are unobstructed, the device's own gravity is greater than the upward thrust of the natural gas.

[0064] Step 103: The lower electromagnetic module drives the locking module to retract the locking device control device and move downward. The principle is as follows: when the lower power supply is closed, the lower electromagnetic module is in a powered-on state, and the electromagnetic induction effect 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 action of the downward attraction, driving the slider to slide left and right so that the two ends of the transmission rod move toward the middle. The movement of the two ends of the transmission rod toward the middle drives 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 eddy current sensor is operated in the oil pipe to detect the oil pipe coupling signal (the signal emitted at the connecting coupling between the oil pipes, based on which the connecting coupling between the oil pipes can be determined), and compared with the real oil pipe string data (the number of oil pipes and the length of the oil pipes), the well depth of the device is obtained and sent to the data processing module.

[0067] Step 105: The data processing module determines whether the well depth reaches the preset depth according to the well depth. If so, step 106 is executed; if not, step 104 is executed;

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

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

[0070] Specifically: when the lower power supply is disconnected, the lower induction coil has no electromagnetic induction effect, and the lower spring provides an upward elastic force for the lower moving iron core. At this time, the elastic force of the lower spring moves upward, driving 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 drives the locking device to extend, so that the device is locked.

[0071] Step 108: The temperature and pressure monitoring module collects the temperature data 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 reaches the preset monitoring time. If so, step 110 is executed; if not, step 108 is executed.

[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 to form a closed flow channel, so that natural gas cannot enter the circulating flow channel. Specifically: when the upper power supply is closed, the induction coil makes the upper fixed iron core 8 and the upper moving iron core 9 have opposite magnetism due to the effect of electromagnetic induction, and the upper fixed iron core 8 generates an upward attraction to the upper moving iron core 9, driving the upper moving iron core 9 to move upward, and the upper moving iron core 9 moves upward to drive the sealing head 15 to move upward and contact with the sealing seat 16 to close the flow channel 14, so that natural gas cannot enter the circulating flow channel, and the device's own gravity is less than the upward thrust of the natural gas.

[0075] Step 112: The lower electromagnetic module drives the locking module to extend the locking device control device to move upward. Specifically, when the lower power supply is disconnected, the lower induction coil has no electromagnetic induction effect, and the lower spring provides an upward elastic force for the lower moving iron core. At this time, the elastic force of the lower spring moves upward, driving the slider to slide left and right, so that the two ends of the transmission rod move to both sides, and the two ends of the transmission rod move to both sides to drive the locking device to extend, so that the device is locked.

[0076] Steps 104 to 112 are repeatedly performed until temperature data and pressure data are collected and stored at all preset depths and returned to the wellhead.

[0077] From the above content, it can be known that the gas well downhole temperature and pressure monitoring method provided by the present invention can realize long-term monitoring of downhole flow temperature and pressure without shutting down the well, and after the preset monitoring time, it can change the area of ​​the flow channel so that the device's own gravity is greater than or less than the upward thrust of the natural gas, and then it can automatically move downward or upward, and adaptively return to the wellhead to facilitate personnel to analyze data. The monitoring method implemented by the above monitoring equipment does not require the use of cables, winches, cranes, blowout preventers, lubricators and other equipment, and does not require multiple professionals to install and operate, which simplifies the operation process of downhole temperature and pressure monitoring, reduces time and labor costs, and can more efficiently and accurately obtain downhole temperature and pressure parameters, providing reliable data support for dynamic monitoring of natural gas well production and process optimization.

[0078] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0079] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0080] The above is only the embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present 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; The depth monitoring module is used to monitor depth data, determine the well depth according to 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 is also used to control the closing or disconnection of the power supply according to the well depth to supply power to the electromagnetic module, the depth monitoring module and the temperature and pressure monitoring module; The upper electromagnetic module of the electromagnetic module is respectively connected to the control module and the current channel module, and is used to control the flow of the current channel to move the device downward as a whole according to the power disconnection of the control module, or to control the closing of the current channel to move the device upward as a whole according to the power closing of the control module. The lower electromagnetic module is respectively connected to the control module and the locking module, and is used to control the locking module to extend the locking device to lock the device according to the power disconnection controlled by the control module, or to control the locking module to retract the locking device to move the device according to the power closing controlled by the control module.

2. The monitoring device according to 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 supply 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 supply 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 to analyze whether the well depth has reached a preset depth and whether the locking time has reached a preset monitoring time, and send the analysis results to the power module to close or disconnect the power module.

3. The monitoring device according to claim 2, characterized in that: If the analysis result is that the preset depth is reached, the upper power module is disconnected and the lower power module is disconnected; If the analysis result is 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 is that the preset depth is reached or the preset monitoring time is not reached, the upper power module is disconnected and the lower power module is disconnected; If the analysis result is that the preset monitoring time is reached, the upper power module is closed and the lower power module is closed.

4. The monitoring device according to claim 2, characterized in that: The upper electromagnetic module comprises 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 mounted on the lower end of the data storage module, and the other end is connected to the upper moving iron core through an upper spring; The upper induction coil is connected to the upper power supply module and is used to provide an upward attraction force for the lower moving iron core when the upper power supply is powered; The upper moving iron core is located inside the ring shape of the upper induction coil and is also connected to the flow channel module. It is used to move upward to drive the flow channel to close when the upper power supply provides an upward attraction, and is also used to move downward through the elastic force of the upper spring to drive the flow channel to flow when the upper power supply is powered off.

5. The monitoring device according to 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 upper power module and to the lower moving iron core through the lower spring; The lower induction coil is connected to the lower power supply module, and is used to provide a downward attraction force for the lower moving iron core when the lower power supply is powered; The lower moving iron core is located inside the ring shape 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 the locking device when the lower power supply provides downward attraction when the lower power supply is powered, and is also used to move upward through the elastic force of the lower spring to drive the locking module to extend the locking device when the lower power supply is powered off.

6. The monitoring device according to claim 4, characterized in that: The device also includes a shell, in which the control module, the electromagnetic module, the depth monitoring module and the temperature and pressure monitoring module are installed, and is used to protect the control module, the electromagnetic module, the depth monitoring module and the temperature and pressure monitoring module.

7. The monitoring device according to claim 6, characterized in that: The flow passage module comprises a sealing head, a sealing seat, a flow passage and an inner passage; The sealing seat is located just above the sealing head and is fixedly mounted 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 passage, and is also used to move downward to separate from the sealing seat when the moving iron core moves downward to allow the flow passage to flow; The inner channel is opened on both sides of the sealing head and is located at a vertical relative position to the sealing seat, and is used for natural gas to flow into the flow channel; The flow passage is located between the sealing head, the sealing seat and the inner passage, and is used to prevent the inflow of natural gas when the flow passage is closed, and is also used to allow the inflow of natural gas when the flow passage is flowing.

8. The monitoring device according to claim 7, characterized in that: The sealing seat and the sealing head are made of rubber material, the maximum outer diameter of the sealing seat is greater than the maximum outer diameter of the sealing head, and the sealing head is a curved surface.

9. The monitoring device according to 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 connecting end of the transmission rod and the slider 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 connecting end of the transmission rod and the slider to rotate toward the middle; The transmission rod is connected to the locking device through an axle pin, and is used to rotate to both sides at the connection end of the transmission rod and the slider to drive the locking device to move upward, or is also used to rotate to the middle at the connection end of 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 device through the locking spring when the locking device is driven to move downward when the transmission rod rotates.

10. The monitoring device according to claim 6, characterized in that: The upper electromagnetic module further comprises an upper sealing ring, which is installed at a position where the upper moving iron core and the housing are displaced, and is used to prevent gas and liquid from entering the upper electromagnetic module.

11. The monitoring device according to claim 1, characterized in that: The depth monitoring module includes an eddy current sensor.

12. The monitoring device according to claim 1 or 6, characterized in that: The outer side of the depth monitoring module includes a depth monitoring housing for protecting the collected eddy current signal from interference.

13. The monitoring device according to claim 1, characterized in that: The temperature and pressure monitoring module includes a temperature and pressure sensor.

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

15. The monitoring method according to claim 14, characterized in that: The gas well downhole temperature and pressure monitoring device collects temperature data and pressure data at a preset depth and stores the data, including: Step 101: in response to the operation of initializing preset parameters, 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 flow channel, so that natural gas enters the flow channel to reduce the upward thrust of the natural gas; Step 103: The lower electromagnetic module drives the locking module to retract the locking device to control the device to move downward; Step 104: the depth monitoring module determines the well depth according to the collected depth data and sends it to the data processing module; Step 105: the data processing module determines whether the well depth reaches the preset depth. If yes, the data processing module executes step 106; if no, the data processing module executes step 104. Step 106: Disconnect the lower power 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 temperature data 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 reaches the preset monitoring time, if so, executes step 110, if not, executes 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 circulating flow channel; Step 112: The lower electromagnetic module drives the locking module to extend the locking device to control the device to move upward; Steps 104 to 112 are repeatedly performed until temperature data and pressure data are collected and stored at all preset depths and returned to the wellhead.

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