Metering system and metering method suitable for counting service time of screw drill

Abstract

The invention discloses a metering system and a metering method suitable for counting the service time of a screw drill, and aims to solve the problems of low data accuracy and possible influence on the performance of the drill when the existing screw drill counts the working time. The device comprises a main control circuit, a rotating speed measurement module, a battery module and a wireless communication module. A ceramic window is formed in the upper end of the anti-falling cap and used for signal transmission, and after a drilling tool is pulled out of a well opening, the accumulated working time of the screw can be read within a certain range through handheld equipment; according to the anti-falling assembly, an existing anti-falling cap and an existing rotor connecting piece are modified, all parts are completely embedded into the anti-falling assembly, the overall structure is compact, wireless non-contact data reading is adopted, operation is convenient and fast, a drilling tool does not need to be disassembled, the working efficiency is improved, and the anti-falling assembly has the advantages of being resistant to high temperature, high pressure and vibration, adapts to the underground severe environment and is suitable for being used in the underground environment. And meanwhile, the integrated installation design of the original appearance and performance of the screw drill is not changed, and the cost is low.

Description

Technical Field

[0001] This application relates to the field of downhole instrument technology in oil wells, specifically to a metering system and method adapted for the statistical analysis of the usage time of screw drill bits. Background Technology

[0002] In oil drilling operations, screw drills are important downhole power tools, mainly composed of bypass valve assembly, motor assembly, universal joint assembly, and drive shaft assembly. Their actual working time is of great significance for judging drill string life, optimizing drilling parameters, and preventing downhole failures.

[0003] Currently, the statistics on screw drilling time mostly rely on ground records or manual estimation, which has the following main problems: First, it cannot accurately reflect the actual working conditions downhole and is easily affected by human factors; second, existing monitoring devices mostly require external sensors or changes to the drill string structure, affecting drill string performance (such as build-up rate); third, data reading is inconvenient, often requiring disassembly of the drill string or connection of wired interfaces, resulting in low operating efficiency. Summary of the Invention

[0004] Therefore, this application provides a measurement system and method adapted to the statistics of the usage time of screw drills, in order to solve the problems of low data accuracy and potential impact on drill performance when the existing screw drills are used to count working time.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] In a first aspect, a metering system adapted for the statistical analysis of the usage time of a screw drill bit is provided. The metering system is installed inside an anti-drop assembly of the screw drill bit. The anti-drop assembly includes a housing and an anti-drop cap disposed inside the housing. The anti-drop cap is connected to a rotor connector.

[0007] The metering system includes a main control circuit, a speed measurement module, a battery module, and a wireless communication module. The main control circuit and the battery module are both located in the first cavity of the rotor connector, with the battery module located at the end of the first cavity away from the anti-fall cap. The main control circuit is connected to the wireless communication module, the speed measurement module, and the battery module, with the wireless communication module located at the end closer to the anti-fall cap.

[0008] A ceramic window is provided on the upper shell of the anti-fall cap, corresponding to the position near the wireless communication module. The ceramic window is directly opposite the position of the wireless communication module, which is used to establish a communication connection between the main control circuit and the external handheld device.

[0009] Optionally, the main control circuit includes a main control circuit board;

[0010] The rotor connector has a first cavity inside, which is used to install the speed measurement module, the battery module and the main control circuit board.

[0011] The lower end of the interior of the anti-fall cap forms a second cavity that communicates with the first cavity, and the second cavity is used to accommodate the wireless communication module;

[0012] The interior of the first cavity is also provided with a vibration damping pad corresponding to the end away from the anti-fall cap.

[0013] Optionally, the rotor connector may also have a circuit board bracket inside for mounting the main control circuit board.

[0014] Optionally, the rotational speed measurement module employs a gyroscope sensor to sense the rotor's angular velocity.

[0015] Optionally, the battery module is a lithium battery pack.

[0016] Optionally, the wireless communication module may be a Bluetooth module.

[0017] Optionally, the rotational speed measurement module is located in the bypass valve assembly of the screw drill or in the upper short section of the drill.

[0018] Optionally, the main control circuit is also equipped with a timer and a non-volatile memory. The timer is used to count the running time of the screw drill during system wake-up operation, and the non-volatile memory is used to store and update the accumulated running time.

[0019] Secondly, a measurement method adapted for the statistical analysis of screw drill bit usage time includes the aforementioned measurement system adapted for the statistical analysis of screw drill bit usage time, the measurement method comprising the following steps:

[0020] Step 1: Power on the system and supply power to all modules;

[0021] Step 2: System self-test. The controller of the main control circuit checks the communication and status of the module. If the self-test passes, the system enters the normal working process. If the self-test fails, the system enters the fault mode. The controller records the fault information and stores it. Then the system enters the low power state, stops all detection and timing functions, and waits for maintenance.

[0022] Step 3: After the system self-test passes, it enters the normal operation process; the controller starts the vibration signal detection process to determine whether a valid speed signal is detected.

[0023] If no valid signal is detected, the system enters deep sleep mode; in this state, the system operates at low power and only maintains timing and wireless monitoring functions.

[0024] If a valid signal is detected: the system is woken up, enters working timing mode, and begins precise timing and recording;

[0025] Step 4: During the working mode, the speed measurement module monitors the speed in real time, accumulates the working time, and determines whether the speed signal is valid.

[0026] If the speed signal is restored within the preset "interruption timeout" T2, it is considered as continuous operation and the timer continues to accumulate.

[0027] If the speed signal has not recovered after time T2, it is determined that the timeout has occurred, the current operation ends, and the system enters deep sleep mode.

[0028] When the current task is completed, the task duration is calculated, added to the cumulative time in the memory, and the total time is stored in non-volatile memory; after saving, the system automatically returns to step three and restarts the signal detection.

[0029] Step 5: If the wireless communication module receives a read command, the controller reads the total time in the memory and sends it to the handheld device through the wireless communication module; after the interaction is completed, the system automatically returns to deep sleep or working timer mode.

[0030] Compared with the prior art, this application has at least the following beneficial effects:

[0031] 1. Based on further analysis and research of existing technical problems, this application provides a metering system adapted for the statistical analysis of the usage time of screw drill bits. This metering system is embedded within the anti-drop assembly of the screw drill bit and includes a main control circuit, a speed measurement module, a battery module, and a wireless communication module. An installation cavity is opened inside the anti-drop cap and rotor connector to house components such as batteries and circuit boards. A ceramic window is opened at the upper end of the anti-drop cap for signal transmission. After the drill bit is pulled out of the wellhead, data such as the cumulative working time and historical speed curve of the screw can be read within a certain range using a handheld device. This application modifies the existing anti-drop cap and rotor connector, completely embedding all components within the anti-drop assembly. The overall structure is compact, employing wireless non-contact data reading for convenient operation without disassembling the drill bit, thus improving operational efficiency. It also has advantages such as high temperature resistance, high pressure resistance, and vibration resistance, adapting to harsh downhole environments. Furthermore, the integrated installation design does not alter the original shape and performance of the screw drill bit, thus not affecting its mechanical performance and directional drilling capability, and is cost-effective.

[0032] 2. The first cavity of this application is also provided with a vibration damping pad at the end away from the anti-fall cap. The vibration damping pad is located at the bottom of the battery module and is used to isolate and attenuate the transmission of the violent vibration generated by the high-speed rotation of the rotor to the electronic components inside the first cavity. This effectively prevents the electronic components from fatigue fracture of the solder joints and poor contact caused by long-term vibration, thereby improving the reliability and service life of the electronic components.

[0033] 3. This application also provides a measurement method adapted to the usage time statistics of screw drill bits. This measurement method combines a sleep-wake mechanism with a low-power, non-contact data management method of a wireless communication module. Through the embedded rotation speed measurement module, it accurately identifies the start and stop status of the screw and automatically switches between deep sleep mode and working timer mode. The system only performs high-precision timing and data saving when the drill bit is actually working, and remains in standby mode at other times. This achieves accurate and automatic accumulation of the actual working time of the screw drill bit, and the data is objective and reliable. It supports non-contact data reading and equipment management without disassembling the drill bit or interrupting the operation. At the same time, it has an ultra-low power sleep mode, long battery life, and can adapt to long-cycle drilling operations. Attached Figure Description

[0034] To more intuitively illustrate the prior art and this application, exemplary drawings are provided below. It should be understood that the specific shapes and structures shown in the drawings should not generally be regarded as limiting conditions for implementing this application; for example, based on the technical concept disclosed in this application and the exemplary drawings, those skilled in the art are able to easily make conventional adjustments or further optimizations to the addition / reduction / classification, specific shapes, positional relationships, connection methods, size ratios, etc. of certain units (components).

[0035] Figure 1 A schematic diagram of a metering system adapted for the statistical analysis of the usage time of screw drill bits, provided as an embodiment of this application;

[0036] Figure 2 This is a schematic diagram of the workflow of a metering system adapted for the statistics of screw drill usage time, provided as an embodiment of this application.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Rotor connector; 2. Vibration damping pad; 3. Battery module; 4. Circuit board bracket; 5. Speed ​​measurement module; 6. Main control circuit; 7. Anti-fall cap; 8. Bluetooth module; 9. Ceramic window. Detailed Implementation

[0039] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] In the description of this application: unless otherwise stated, "a plurality of" means two or more. The terms "first," "second," "third," etc., in this application are intended to distinguish the objects referred to and do not have any special meaning in terms of technical connotation (e.g., they should not be construed as an emphasis on importance or order). Expressions such as "including," "comprising," and "having" also mean "not limited to" (certain units, components, materials, steps, etc.).

[0041] The terms used in this application, such as "upper," "lower," "left," "right," and "middle," are generally used to indicate the general relative positional relationship for the purpose of intuitive understanding by referring to the accompanying drawings, and are not absolute limitations on the positional relationship in the actual product.

[0042] One embodiment of this application discloses a metering system adapted for the statistical analysis of the usage time of a screw drill bit. This metering system uses rotor speed monitoring as its core principle, accumulating actual working time by monitoring the rotational state of the screw drill bit rotor. The screw drill bit typically includes a bypass valve assembly, an anti-drop assembly, a motor assembly, a universal joint assembly, and a drive shaft assembly connected in sequence. The motor assembly includes a rotor and a stator, with the upper end of the rotor connected to a rotor connector. The metering system is integrated within the anti-drop assembly of the screw drill bit. The anti-drop assembly includes a housing and an anti-drop cap 7 disposed inside the housing. The anti-drop cap 7 is connected to the rotor connector 1.

[0043] like Figure 1 As shown, the metering system provided in this application includes a main control circuit 6, a speed measurement module 5, a battery module 3, and a wireless communication module. The main control circuit 6, the speed measurement module 5, and the battery module 3 (battery pack) are all located inside the first cavity of the rotor connector 1 and are distributed along the axial direction. The battery module 3 is located at the end of the first cavity away from the anti-fall cap 7. The main control circuit 6 includes a main control circuit board, which is connected to the wireless communication module, the speed measurement module 5, and the battery module 3 respectively. It is used to receive sensor signals, perform filtering, threshold judgment, time accumulation, and control the sleep and wake-up of the entire system. The wireless communication module is located at the end closer to the anti-fall cap 7.

[0044] A ceramic window 9 is also provided on the upper shell of the anti-drop cap 7, corresponding to the position near the wireless communication module. The ceramic window 9 faces the position of the wireless communication module and is used for signal transmission. The wireless communication module is used to establish a communication connection between the main control circuit 6 and the external handheld device. The ceramic window 9 is insulated and sealed from the metal shell and is pressure resistant. It can withstand the working pressure in the well and allow radio frequency signals to penetrate effectively, thereby realizing a stable wireless connection between the wireless communication module and the external handheld device.

[0045] Preferably, the rotor connector 1 has a first cavity inside, which is used to install the speed measurement module 5, the battery module 3, and the main control circuit board; or, a battery compartment for installing the battery module 3 and a mounting position for the main control circuit board are separately machined inside the rotor connector 1.

[0046] The lower end of the inside of the anti-fall cap 7 forms a second cavity that communicates with the first cavity. The second cavity is used to accommodate the wireless communication module.

[0047] Inside the first cavity, corresponding to the end furthest from the anti-fall cap 7, there is also a vibration damping pad 2. The vibration damping pad 2 is located at the bottom of the battery module 3. Its core function is to isolate and attenuate the transmission of the violent vibration generated by the high-speed rotation of the rotor to the electronic components inside the first cavity. This effectively prevents the electronic components from fatigue fracture of the solder joints and poor contact caused by long-term vibration, thereby improving the reliability and service life of the electronic components.

[0048] More preferably, the rotor connector 1 is further provided with a circuit board bracket 4 for mounting the main control circuit board.

[0049] Preferably, the rotation speed measurement module 5 uses a gyroscope sensor (such as IAM-20380HT) to directly or indirectly sense the rotor rotation angular velocity; when the rotation speed measurement module 5 detects that the rotation speed exceeds the set threshold, the main control circuit board determines that the screw is in working state and starts to accumulate working time.

[0050] Preferably, battery module 3 uses a lithium battery pack.

[0051] The power supply system of this application adopts a high-temperature resistant lithium battery pack (such as D1540-H, 7.2V, 10Ah), which meets the operating temperature range of -40°C to 150°C, and ensures long-term downhole operation through low power consumption design (dormant current ≤8μA).

[0052] Preferably, the wireless communication module adopts Bluetooth module 8 (such as E104-BT5011A), which supports wireless data reading; after the drill string is pulled out of the wellhead, it does not need to be disassembled, and data such as cumulative working time and historical rotation speed curve can be read within a range of 70 meters by handheld device.

[0053] In addition, RFID chips can be used to replace Bluetooth in wireless communication modules to achieve near-field passive reading.

[0054] Alternative monitoring methods: In addition to directly monitoring rotor speed, the screw's operation can also be indirectly determined by monitoring the pressure difference between the inner and outer annulus or the vibration characteristics of the drill bit. The pressure difference method requires the integration of a high-precision pressure sensor, while the vibration method requires setting more complex characteristic frequency thresholds.

[0055] The aforementioned speed measurement module 5 can also be integrated into the bypass valve assembly or the upper section of the drill bit. In this deployment configuration, the internal cavity structure and pressure-bearing sealing scheme of the bypass valve assembly or the upper section need to be redesigned to ensure the overall pressure integrity after integration.

[0056] Preferably, the main control circuit 6 is also equipped with a timer and a non-volatile memory. The timer is used to count the running time of the screw drill during system wake-up operation, and the non-volatile memory is used to reliably store and update the total running time data accumulated by the timer.

[0057] In the above embodiment, during assembly, the vibration damping pad 2, battery module 3 (battery pack), circuit board bracket 4, and main control circuit 6 (including speed measurement module 5) are sequentially placed in the first cavity of rotor connector 1, and Bluetooth module 8 is connected. Finally, anti-drop cap 7 is sealed.

[0058] This application also provides a measurement method adapted for the statistical analysis of screw drill bit usage time, including the aforementioned measurement system adapted for the statistical analysis of screw drill bit usage time, such as... Figure 2 As shown, the measurement method includes the following steps:

[0059] Step 1: Power on the system and supply power to all modules;

[0060] Step 2: System self-test. The main control circuit board (i.e., the controller) of the main control circuit 6 checks the communication and status of the modules. If the self-test passes, the system enters the normal working process. If the self-test fails, the system enters the fault mode. The controller records the fault information and stores it. Then the system enters the low power state, stops all detection and timing functions, and waits for maintenance.

[0061] Step 3: After the system self-test passes, the system enters the normal operation process; the controller starts the vibration signal detection process to determine whether a valid speed signal is detected.

[0062] If no valid signal is detected, the system enters deep sleep mode. In this state, the system operates at low power and only maintains the timing and wireless monitoring functions. Specifically, if the speed signal strength is determined to be continuously lower than the set threshold, or the signal does not exceed the set threshold for a preset stable time, it is determined that no valid speed signal is detected, and the system enters deep sleep mode, maintaining only the timing and wireless monitoring functions.

[0063] If a valid signal is detected: the system is woken up, enters the working timer mode, and begins precise timing and recording; specifically: if the speed signal strength is determined to continuously exceed the set threshold, and the signal duration reaches the preset stable time T1 (e.g., the duration is greater than 2-5 seconds), then a valid speed signal is determined to be detected. At this time, the system is woken up, enters the working timer mode, and begins precise timing and recording.

[0064] Step 4: During the working mode, the speed measurement module 5 monitors the speed in real time, accumulates the working time, and determines whether the speed signal is valid.

[0065] If the speed signal is restored within the preset "interruption timeout" T2 (e.g., 30 seconds), it is considered as continuous operation and the timer continues to accumulate.

[0066] If the speed signal has not recovered after time T2, it is determined that the timeout has occurred, the current operation ends, and the system enters deep sleep mode.

[0067] When the current task is completed, the task duration is calculated, added to the cumulative time in the memory, and the total time is stored in non-volatile memory; after saving, the system automatically returns to step three and restarts the signal detection.

[0068] Step 5: If the wireless communication module receives a read command, the controller reads the total time from the memory and sends it to the handheld device via the wireless communication module; after the interaction is completed, the system automatically returns to deep sleep or working timer mode.

[0069] Application example:

[0070] Implement this system in the anti-drop assembly of the Φ172mm screw drill bit:

[0071] 1. Modify the original integral anti-drop cap 7 of the screw drill bit into a structure with a ceramic window 9 at the top and an internal mounting cavity;

[0072] 2. Machining the battery compartment and circuit board mounting position inside the original rotor connector 1;

[0073] 3. During assembly, place the vibration damping pad 2, battery pack, circuit board bracket 4, main control circuit 6 (including speed measurement module 5), Bluetooth module 8 in sequence, and finally seal with anti-drop cap 7.

[0074] 4. When the screw is lowered into the well, the system automatically accumulates the working time. After the drill string is pulled out, use a dedicated handheld terminal to approach the end of the drill string and read information such as "cumulative working time: 125.6 hours" via Bluetooth.

[0075] In summary, this application has at least the following advantages:

[0076] 1. The metering system provided in this application is a working time metering system structure that is completely embedded inside the existing anti-drop assembly of the screw drill bit and is based on rotor speed monitoring. It does not change the outer diameter, length, or connecting thread of the screw, and does not affect the mechanical performance or directional drilling capability of the drill bit at all. Specifically, by modifying the existing anti-drop cap and rotor connector, an installation cavity is opened inside to house the battery, circuit board, etc., and a ceramic window is opened at the upper end of the anti-drop cap for Bluetooth signal transmission. After the drill bit is pulled out of the wellhead, data such as cumulative working time and historical speed curve can be read within a 70-meter range using a handheld device. The overall structure is compact and has the advantages of high temperature resistance, high pressure resistance, and vibration resistance, adapting to harsh downhole environments, and is an integrated installation design that does not change the original shape and performance of the screw drill bit.

[0077] 2. This application adopts wireless non-contact data reading, which is convenient to operate, does not require disassembling the drilling tool, and improves work efficiency;

[0078] 3. The metering method provided in this application combines a sleep-wake mechanism with a low-power, non-contact data management method of a wireless communication module, which enables accurate and automatic accumulation of the actual working time of the screw drill bit, and the data is objective and reliable; at the same time, it has an ultra-low power sleep mode, long battery life, and can adapt to long-cycle drilling operations.

[0079] The technical features of the above embodiments can be combined in any way (as long as there is no contradiction in the combination of these technical features). For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; these embodiments not explicitly written should also be considered to be within the scope of this specification.

Claims

1. A metering system adapted for the statistical analysis of the usage time of screw drill bits, characterized in that, The metering system is installed inside the anti-drop assembly of the screw drill bit. The anti-drop assembly includes a housing and an anti-drop cap disposed inside the housing. The anti-drop cap is connected to the rotor connector. The metering system includes a main control circuit, a speed measurement module, a battery module, and a wireless communication module. The main control circuit and the battery module are both located in the first cavity of the rotor connector, with the battery module located at the end of the first cavity away from the anti-fall cap. The main control circuit is connected to the wireless communication module, the speed measurement module, and the battery module, with the wireless communication module located at the end closer to the anti-fall cap. A ceramic window is provided on the upper shell of the anti-fall cap, corresponding to the position near the wireless communication module. The ceramic window is directly opposite the position of the wireless communication module, which is used to establish a communication connection between the main control circuit and the external handheld device.

2. The metering system adapted for the statistical analysis of screw drill usage time according to claim 1, characterized in that, The main control circuit includes a main control circuit board; The rotor connector has a first cavity inside, which is used to install the speed measurement module, the battery module and the main control circuit board. The lower end of the interior of the anti-fall cap forms a second cavity that communicates with the first cavity, and the second cavity is used to accommodate the wireless communication module; The interior of the first cavity is also provided with a vibration damping pad corresponding to the end away from the anti-fall cap.

3. The metering system adapted for the statistical analysis of screw drill usage time according to claim 2, characterized in that, The rotor connector also has a circuit board bracket inside for mounting the main control circuit board.

4. The metering system adapted for the statistical analysis of screw drill usage time according to claim 1, characterized in that, The rotational speed measurement module uses a gyroscope sensor to sense the angular velocity of the rotor.

5. The metering system adapted for the statistical analysis of screw drill usage time according to claim 1, characterized in that, The battery module uses a lithium battery pack.

6. The metering system adapted for the statistical analysis of screw drill usage time according to claim 1, characterized in that, The wireless communication module uses a Bluetooth module.

7. The metering system adapted for the statistical analysis of screw drill usage time according to claim 1, characterized in that, The rotational speed measurement module is located in the bypass valve assembly of the screw drill or in the upper short section of the drill.

8. The metering system adapted for the statistical analysis of screw drill usage time according to any one of claims 1-7, characterized in that, The main control circuit is also equipped with a timer and a non-volatile memory. The timer is used to count the running time of the screw drill during system wake-up operation, and the non-volatile memory is used to store and update the accumulated running time.

9. A measurement method suitable for the statistical analysis of the usage time of screw drill bits, characterized in that, The metering system, including the metering system for statistical analysis of screw drill usage time as described in claim 8, comprises the following steps: Step 1: Power on the system and supply power to all modules; Step 2: System self-test. The controller of the main control circuit checks the communication and status of the modules. If the self-test passes, the system enters the normal working process. If the self-test fails, the system enters a fault mode. The controller records and stores the fault information, and then the system enters a low-power state, stopping all detection and timing functions and waiting for maintenance. Step 3: After the system self-test passes, it enters the normal operation process; the controller starts the vibration signal detection process to determine whether a valid speed signal is detected. If no valid signal is detected, the system enters deep sleep mode; In this state, the system operates at low power, maintaining only timing and wireless monitoring functions; If a valid signal is detected: the system is woken up, enters working timing mode, and begins precise timing and recording; Step 4: During the working mode, the speed measurement module monitors the speed in real time, accumulates the working time, and determines whether the speed signal is valid. If the speed signal is restored within the preset "interruption timeout" T2, it is considered as continuous operation and the timer continues to accumulate. If the speed signal has not recovered after time T2, it is determined that the timeout has occurred, the current operation ends, and the system enters deep sleep mode. When the current task is completed, the task duration is calculated, the task duration is added to the cumulative time in memory, and the total time is stored in non-volatile memory; After saving, the system automatically returns to step three and restarts signal detection; Step 5: If the wireless communication module receives a read command, the controller reads the total time in the memory and sends it to the handheld device through the wireless communication module; after the interaction is completed, the system automatically returns to deep sleep or working timer mode.

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