Over-temperature protection device for drilling instruments and drilling instruments

Abstract

This invention provides an over-temperature protection device for a drilling instrument and the drilling instrument itself, belonging to the field of oil and gas development and exploration. The over-temperature protection device for the drilling instrument includes: a temperature detection module, a voltage feedback module, and a power switch module. The temperature detection module detects the current temperature of the drilling instrument and outputs a corresponding temperature detection signal. The voltage feedback module outputs a voltage control signal to the control terminal of the power switch module based on the temperature detection signal and feeds the voltage control signal back to the input terminal of the voltage feedback module. The power switch module activates or deactivates the circuit connection between the input and output terminals of the power switch module according to the voltage control signal, thereby controlling the power signal input to the drilling instrument. This device can control the power signal input to the drilling instrument based on temperature, effectively preventing malfunctions or damage to the drilling instrument circuitry and sensors caused by operating under conditions exceeding the operating temperature.

Description

Technical Field

[0001] This utility model belongs to the field of oil and gas development and exploration, and specifically relates to an over-temperature protection device for a drilling instrument and a drilling instrument. Background Technology

[0002] Drilling exploration is characterized by high investment and high risk. As oil and gas resources become increasingly depleted, the depth of the exploration and development formations gradually increases, leading to higher bottom-hole temperatures. In some wells, the bottom-hole temperature approaches 200°C, further increasing investment and risk. To reduce the risks of oil and gas drilling and development and save on investment, instruments such as logging while drilling (LWD), measurement while drilling (MWD), or near-bit gamma ray measurement are often used during the drilling process to collect bottom-hole formation parameters and transmit the data to the surface. This allows drilling engineers to understand the bottom-hole formation and guide geological steering decisions during drilling.

[0003] During drilling, there are static and circulating states. In the static state, the drilling instrument (WAW) is affected by the formation temperature, and its temperature gradually rises until it reaches the formation temperature. In the circulating state, due to the continuous circulation of drilling fluid, the drilling fluid cools the WWA, and the bottom hole circulating temperature is lower than the formation temperature. The WWA operates alternately between these static and circulating states, and its operating temperature fluctuates accordingly. The WWA contains many electronic components and sensors, with specific operating and storage temperature ranges. The storage temperature range is generally greater than the operating temperature range. When operating outside the operating temperature range, the electronic components often malfunction, causing instability or damage to the WWA. However, when not powered on and not in operation, and at temperatures above the operating temperature but below the storage temperature, the components remain intact.

[0004] During drilling, existing drilling instruments are always powered on. Given a fixed operating temperature range, excessively high formation temperatures can cause instrument failure or damage. Therefore, the formation temperature of existing drilling instruments must be within their operating temperature range, limiting their application in high-temperature formations.

[0005] In summary, existing drilling tools have poor adaptability to formation temperature, and when their operating temperature range is fixed, the depth and area they can operate in are relatively small. Utility Model Content

[0006] The purpose of this utility model is to solve the problems existing in the prior art and provide an over-temperature protection device and a drilling instrument, which effectively solves the problems that the existing drilling instruments have poor adaptability to formation temperature and relatively small working depth and area.

[0007] This utility model is achieved through the following technical solution:

[0008] In a first aspect, the utility model provides an over-temperature protection device for a drilling instrument, the over-temperature protection device comprising: a temperature detection module, a voltage feedback module, and a power switch module;

[0009] The output terminal of the temperature detection module is connected to the input terminal of the voltage feedback module. The temperature detection module is used to detect the current temperature of the drilling instrument and output the corresponding temperature detection signal.

[0010] The first output terminal of the voltage feedback module is connected to the control terminal of the power switch module, and the second output terminal of the voltage feedback module is connected to the input terminal of the voltage feedback module; the voltage feedback module is used to output a voltage control signal to the control terminal of the power switch module based on the temperature detection signal, and to feed back the voltage control signal to the input terminal of the voltage feedback module.

[0011] The power switch module is used to activate or deactivate the circuit connection between the input and output terminals of the power switch module according to the voltage control signal, so as to control the power signal input to the drilling instrument.

[0012] Preferably, the temperature detection module includes: a first resistor, a second resistor, a thermistor, and a first diode; the first resistor, the second resistor, and the thermistor each have a first terminal and a second terminal, and the first diode has a positive terminal and a negative terminal;

[0013] The first end of the first resistor is connected to the circuit power supply, and the second end is connected to the negative terminal of the first diode, while the positive terminal of the first diode is grounded; the second resistor and the thermistor are connected in series between the second end of the first resistor and ground.

[0014] Preferably, the first diode is a Zener diode, and the thermistor is a negative temperature coefficient thermistor or a positive temperature coefficient thermistor.

[0015] Preferably, when the thermistor is a positive temperature coefficient thermistor, the first terminal of the thermistor is connected to the reference node after the Zener diode is clamped, the second terminal of the thermistor is connected to the first terminal of the second resistor, and the second terminal of the second resistor is grounded.

[0016] Preferably, when the thermistor is a negative temperature coefficient thermistor, the first end of the second resistor is connected to the reference node after the Zener diode is clamped, the second end of the second resistor is connected to the first end of the thermistor, and the second end of the thermistor is grounded.

[0017] Preferably, the voltage feedback module includes: a third resistor, a fourth resistor, a fifth resistor, a first switching element, a second switching element, and a second diode; the third resistor, the fourth resistor, and the fifth resistor each have a first terminal and a second terminal, the second diode has a positive terminal and a negative terminal, and the first switching element and the second switching element each include a switching terminal, an input terminal, and an output terminal;

[0018] The first ends of the fourth resistor and the fifth resistor are both connected to the circuit power supply. The second end of the fourth resistor is connected to the input terminal of the first switching element, and the second end of the fifth resistor is connected to the input terminal of the second switching element. The output terminals of the first switching element and the second switching element are both grounded. The second end of the fifth resistor is connected to the control terminal of the power switch module. The input terminal of the first switching element is connected to the control terminal of the second switching element, and the control terminal of the first switching element is connected to the output terminal of the temperature detection module. The third resistor and the second diode are connected in series between the second end of the fifth resistor and the input terminal of the voltage feedback module.

[0019] Preferably, the first switching element and the second switching element are N-channel metal-oxide-semiconductor field-effect transistors.

[0020] Preferably, the power switch module includes: a sixth resistor, a third switching element, and a fourth switching element; the third switching element and the fourth switching element respectively include a switching terminal, an input terminal, and an output terminal; the sixth resistor has a first terminal and a second terminal;

[0021] The third switching element's switching terminal is connected to the second terminal of the fifth resistor, the input terminal of the third switching element is connected to the switching terminal of the fourth switching element, the input terminal of the fourth switching element is connected to the circuit power supply, and the output terminal of the fourth switching element is connected to the drilling instrument.

[0022] Preferably, the third switching element is an N-channel metal-oxide-semiconductor field-effect transistor, and the fourth switching element is a PNP transistor.

[0023] A second aspect of this utility model provides a drilling instrument, the drilling instrument including an over-temperature protection device as described in any of the preceding claims.

[0024] Compared with existing technologies, the beneficial effects of this utility model are as follows: This utility model proposes an over-temperature protection device for a drilling instrument, which can cut off the power supply to the electronic components (e.g., sensors) and circuit modules of the drilling instrument when the ambient temperature exceeds the upper limit of the operating temperature, thus stopping its operation; and restore power supply when the ambient temperature falls below the upper limit of the operating temperature, so that the drilling instrument can continue to operate, avoiding malfunctions or damage to the circuits and sensors of the drilling instrument caused by operating under conditions exceeding the operating temperature, effectively protecting the circuits and electronic components in the drilling instrument. At the same time, it also broadens the formation temperature range that the drilling instrument can serve in drilling applications, improves its adaptability to formation temperature, and allows for a wider range of well depths and areas where it can operate, enabling the drilling instrument of the same temperature level to serve wells with higher temperatures and greater depths. Attached Figure Description

[0025] The above and other objects, features, and advantages of this utility model will become more apparent from the more detailed description of the embodiments thereof in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this utility model and form part of the specification. They are used together with the embodiments of this utility model to explain the utility model and do not constitute a limitation thereof.

[0026] Figure 1 This is a schematic diagram of the over-temperature protection device of the drilling instrument according to an embodiment of the present invention;

[0027] Figure 2 This is a circuit diagram of the over-temperature protection device for a drilling instrument according to an embodiment of the present invention.

[0028] Figure 3 This is a schematic diagram of the structure of the drilling instrument according to an embodiment of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 11: First resistor

[0031] 12: Second resistor

[0032] 13: Third resistor

[0033] 14: Fourth resistor

[0034] 15: Fifth Resistor

[0035] 16: Sixth resistor

[0036] 17: Thermistor

[0037] 21: First diode

[0038] 22: Second diode

[0039] 31: First switching element

[0040] 32: Second switching element

[0041] 33: Third switching element

[0042] 34: Fourth switching element

[0043] 41: First capacitor

[0044] 210: Temperature detection circuit

[0045] 220: Voltage feedback circuit

[0046] 230: Power switch circuit Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this utility model more apparent, exemplary embodiments according to this utility model will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this utility model, and not all embodiments of this utility model. It should be understood that this utility model is not limited to the exemplary embodiments described herein. Based on the embodiments of this utility model described herein, all other embodiments obtained by those skilled in the art without inventive effort should fall within the protection scope of this utility model.

[0048] To address the problem that existing drilling instruments have poor adaptability to formation temperatures, resulting in a relatively small working depth and area range when their operating temperature range is fixed, this invention proposes an over-temperature protection device and a drilling instrument that can improve formation temperature adaptability and the working depth and area range. The invention will be further described in detail below with reference to the accompanying drawings.

[0049] First, refer to Figure 1 This invention describes an over-temperature protection device for a drilling instrument according to some embodiments of the present invention.

[0050] Figure 1 This is a schematic diagram of the over-temperature protection device of the drilling instrument according to some embodiments of the present invention, such as... Figure 1 As shown, the over-temperature protection device of the drilling instrument in this utility model includes: a temperature detection module 110, a voltage feedback module 120, and a power switch module 130.

[0051] In this invention, the drilling instrument can be a drilling measurement instrument, a control instrument, and a transmission instrument, but is not limited to these. An over-temperature protection device is installed between the existing instrument power supply and the circuitry of the drilling instrument. The over-temperature protection device monitors the ambient temperature of the drilling instrument and controls the power supply to the drilling instrument to turn on and off.

[0052] The output terminal of the temperature detection module 110 is connected to the input terminal of the voltage feedback module 120. The temperature detection module 110 is used to detect the current temperature of the drilling instrument and output the corresponding temperature detection signal.

[0053] The first output terminal of the voltage feedback module 120 is connected to the control terminal of the power switch module 130, and the second output terminal of the voltage feedback module 120 is connected to the input terminal of the voltage feedback module 120. The voltage feedback module 120 is used to output a voltage control signal to the control terminal of the power switch module 130 based on the temperature detection signal, and to feed back the voltage control signal to the input terminal of the voltage feedback module 120.

[0054] The output terminal of the voltage feedback module 120 is connected to the control terminal of the power switch module 130 to control the on / off state of the circuit between the input and output terminals of the power switch module 130.

[0055] By feeding back the voltage control signal to the input of the voltage feedback module 120, the voltage output by the temperature detection module 110, i.e., the input voltage of the voltage feedback module 120, is clamped. Thus, when the system determines that the temperature is too high, the voltage output by the temperature detection module 110 is pulled down, indirectly increasing the amplitude of the temperature detection signal change and accelerating the triggering of the subsequent power switching circuit.

[0056] The power switch module 130 is used to start or stop the circuit connection between the input and output terminals of the power switch module 120 according to the voltage control signal, so as to control the power signal input to the drilling instrument.

[0057] Specifically, the power switch module 130 includes an input terminal, an output terminal, and a control terminal. The input terminal of the power switch module 130 can be connected to the power supply of the drilling instrument, and the output terminal of the power switch module 130 is connected to the drilling instrument body. The power switch module 130 is used to start or stop the power signal input to the drilling instrument body according to the voltage control signal.

[0058] The temperature detection module 110 outputs voltage to the voltage feedback module 120, and the voltage feedback module 120 outputs voltage to the power switch module 130. The power switch module 130 turns the instrument power on or off based on the voltage output from the voltage feedback module 120, and outputs power to the circuits and sensors in the drilling instrument.

[0059] This invention proposes an over-temperature protection device for a drilling instrument. It cuts off the power supply to the electronic components (e.g., sensors) and circuit modules of the drilling instrument when the ambient temperature exceeds the upper limit of their operating temperature, thus stopping their operation. Power is restored when the ambient temperature falls below the upper limit of the operating temperature, allowing the drilling instrument to continue operating. This effectively protects the circuits and electronic components of the drilling instrument from malfunctions or damage caused by operating the instrument's circuitry and sensors under conditions exceeding the operating temperature. Simultaneously, it broadens the formation temperature range that the drilling instrument can serve in drilling applications, improving its adaptability to formation temperatures and allowing for operations at greater depths and in wider areas. This enables drilling instruments of the same temperature rating to serve wells at higher temperatures and greater depths.

[0060] Next, refer to Figure 2 The circuit principle of the over-temperature protection device of the drilling instrument according to the embodiments of the present invention will be described.

[0061] Figure 2 The circuit diagram of the over-temperature protection device for the drilling instrument according to an embodiment of the present invention is shown below. Figure 2 As shown, the over-temperature protection device includes: a temperature detection circuit 210, a voltage feedback circuit 220, and a power switch circuit 230.

[0062] The power input terminal is connected to the power supply of the drilling instrument, so that the power supply of the drilling instrument can simultaneously power the temperature detection circuit 210 and the voltage feedback circuit 220.

[0063] The temperature detection circuit 210 includes a first resistor 11, a second resistor 12, a thermistor 17, and a first diode 21. The first resistor 11, the second resistor 12, and the thermistor 17 each have a first terminal and a second terminal, and the first diode 21 has a positive terminal and a negative terminal. Here, the first diode 21 is a Zener diode.

[0064] The first end of the first resistor 11 is connected to the power input terminal, and its second end is connected to the negative terminal of the first diode 21, while the positive terminal of the first diode 21 is grounded.

[0065] The first diode 21 operates in reverse breakdown mode, clamping the voltage at the second terminal of the first resistor 11 to a fixed value, such as 3V or 5V, the value of which depends on the regulated voltage, thus forming a stable reference voltage node. Driven by the power supply of the drilling instrument, the first diode 21 and the first resistor 11 achieve stable voltage output in high-temperature environments, which will not change due to small fluctuations in the power supply of the drilling instrument within a certain range, providing a stable operating voltage for the thermistor 17 and the second resistor 12, thereby ensuring that the subsequent temperature detection signal acquisition is not affected by the fluctuations in the power supply signal of the drilling instrument.

[0066] The series voltage divider circuit consisting of thermistor 17 and the second resistor 12, driven by a stable power supply, outputs a temperature-dependent voltage to the subsequent voltage feedback circuit 220 because the resistance of thermistor 17 changes with temperature.

[0067] In this embodiment, thermistor 17 is a positive temperature coefficient (PTR) thermistor. The first terminal of thermistor 17 is connected to the reference node (the second terminal of the first resistor 11) after the Zener diode is clamped. The second terminal of thermistor 17 is connected to the first terminal of the second resistor 12, and the second terminal of the second resistor 12 is grounded. The first terminal of the second resistor 12 serves as the output terminal of the temperature detection circuit 210 and is connected to the input terminal of the voltage feedback circuit 220. The voltage divider signal from the second resistor 12 is transmitted to the voltage feedback circuit 220 as the temperature detection signal generated by the temperature detection circuit 210.

[0068] As a temperature-sensitive element, the resistance of thermistor 17 changes with temperature, and the voltage output at the voltage divider node (the first terminal of the second resistor 12) also changes with temperature, specifically:

[0069] As temperature increases, its resistance increases, and the voltage divider output voltage decreases.

[0070] As the temperature decreases, its resistance decreases, and the voltage at the voltage divider node increases.

[0071] Optionally, the thermistor 17 can also be a negative temperature coefficient (NTR) thermistor. In this case, the first terminal of the second resistor 12 is connected to the reference node (the second terminal of the first resistor 11) after being clamped by the Zener diode, and the second terminal of the second resistor 12 is connected to the first terminal of the thermistor 17. The second terminal of the thermistor 17 is grounded. The first terminal of the thermistor 17 is connected to the input terminal of the voltage feedback circuit 220 as the output terminal of the temperature detection circuit 210. The voltage divider signal of the thermistor 17 is transmitted to the voltage feedback circuit 220 as the temperature detection signal generated by the temperature detection circuit 210.

[0072] As a temperature-sensitive element, the resistance of thermistor 17 changes with temperature, and the voltage output at the voltage divider node (the first terminal of thermistor 17) also changes with temperature, specifically:

[0073] As temperature increases, its resistance decreases, and the voltage divider output voltage decreases.

[0074] As the temperature decreases, its resistance increases, and the voltage at the voltage divider node increases.

[0075] The ambient temperature is monitored by the temperature detection circuit 210, which can output a temperature-related voltage.

[0076] Preferably, the temperature detection circuit 210 further includes a first capacitor 41. When the thermistor 17 is a PTR thermistor, the first terminal of the first capacitor 41 is connected to the first terminal of the second resistor 12, and the second terminal is grounded. When the thermistor 17 is an NTR thermistor, the first terminal of the first capacitor 41 is connected to the first terminal of the thermistor 17, and the second terminal is grounded.

[0077] The voltage is output after being filtered by the voltage divider output from the first capacitor 41 and the temperature detection circuit 210.

[0078] The voltage feedback circuit 220 takes the output voltage of the temperature detection circuit 210 as its input voltage, and the output voltage drives the power switch circuit 230 to achieve positive voltage feedback and lock its input voltage.

[0079] The voltage feedback circuit 220 includes: a third resistor 13, a fourth resistor 14, a fifth resistor 15, a first switching element 31, a second switching element 32, and a second diode 22.

[0080] The third resistor 13, the fourth resistor 14, and the fifth resistor 15 each have a first terminal and a second terminal, and the second diode 22 has a positive terminal and a negative terminal. The first switching element 31 and the second switching element 32 each include a switching terminal, an input terminal, and an output terminal. The first terminals of the fourth resistor 14 and the fifth resistor 15 are both connected to the power input terminal. The second terminal of the fourth resistor 14 is connected to the input terminal of the first switching element 31, and the second terminal of the fifth resistor 15 is connected to the input terminal of the second switching element 32. The output terminals of the first switching element 31 and the second switching element 32 are both grounded. The second terminal of the fifth resistor 15 serves as the first output terminal of the voltage feedback circuit 220 and is connected to the control terminal of the power switch circuit 230. The input terminal of the first switching element 31 is connected to the control terminal of the second switching element 32, and the control terminal of the first switching element 31 serves as the input terminal of the voltage feedback circuit 220 and is connected to the output terminal of the temperature detection circuit 210.

[0081] The third resistor 13 and the second diode 22 are connected in series to the second terminal of the fifth resistor 15 and the input terminal of the voltage feedback circuit 220. Specifically, the negative terminal of the second diode 22 is connected to the input terminal of the voltage feedback circuit 220 and also to the output terminal of the temperature detection circuit 210, while the positive terminal is connected to the first terminal of the third resistor 13, and the second terminal of the third resistor 13 is connected to the second terminal of the fifth resistor 15.

[0082] Specifically, the first switching element 31 and the second switching element 32 are N-channel metal-oxide-semiconductor field-effect transistors (MOSFETs), wherein the gate of the MOSFET is used as the switching terminal, the drain is used as the input terminal, and the source is used as the output terminal.

[0083] The voltage divider output by the temperature detection circuit 210 drives the gate of the first switching element 31. When the temperature rises, and the voltage divider output by the temperature detection circuit 210 falls below the turn-on threshold voltage of the first switching element 31, the drain and source of the first switching element 31 are cut off. The drain output voltage of the first switching element 31 rises above the turn-on threshold voltage of the second switching element 32, and the drain and source of the second switching element 32 are turned on. The drain voltage of the second switching element 32 is pulled low by the fifth resistor 15, thus turning off the power switch circuit 230.

[0084] When the temperature decreases, the voltage divider output by the temperature detection circuit 210 exceeds the turn-on threshold voltage of the first switching element 31. The drain and source of the first switching element 31 then conduct. The drain output voltage of the first switching element 31 is pulled down by the fourth resistor 14, falling below the turn-on threshold voltage of the second switching element 32. The drain and source of the second switching element 32 then turn off. The drain of the second switching element 32 is then pulled high, turning on the subsequent power switch circuit 230. Simultaneously, positive voltage feedback is achieved by feeding back to the gate of the first switching element 31 through the third resistor 13 and the second diode 22.

[0085] The power switch circuit 230 includes an input terminal, an output terminal, and a control terminal. The input and output terminals of the power switch circuit 230 are connected in series between the power input terminal and the power output terminal, with the input terminal connected to the power input terminal and the output terminal connected to the power output terminal. The control terminal of the power switch circuit 230 is connected to the output terminal of the voltage feedback circuit 220 and is used to control the on / off state of the circuit between the input and output terminals of the power switch circuit 230.

[0086] The power switch circuit 230 includes a sixth resistor 16, a third switching element 33, and a fourth switching element 34. The third switching element 33 and the fourth switching element 34 each include a switching terminal, an input terminal, and an output terminal. The switching terminal of the third switching element 33 is connected to the second terminal of the fifth resistor 15, the input terminal of the third switching element 33 is connected to the switching terminal of the fourth switching element 34, the input terminal of the fourth switching element 34 is connected to the power input terminal, and the output terminal of the fourth switching element 34 is connected to the power output terminal.

[0087] Specifically, the third switching element 33 is an N-channel MOSFET, where the gate of the MOSFET serves as the switching terminal, the drain as the input terminal, and the source as the output terminal. The fourth switching element 34 is a PNP (Positive-Negative-Positive) transistor, where the emitter serves as the input terminal, the collector as the output terminal, and the base as the switching terminal.

[0088] When the drive voltage output by the voltage feedback circuit 220 reaches the turn-on threshold voltage of the third switching element 33, the drain and source of the third switching element 33 are connected, the emitter and base of the fourth switching element 34 are connected, and the emitter and collector of the fourth switching element 34 are connected. This enables the power input terminal to output a power signal through the fourth switching element 34, i.e., the PNP transistor, to power the circuits and sensors of the subsequent drilling instrument. When the drive voltage output by the voltage feedback circuit 220 is lower than the turn-on threshold voltage of the third switching element 33, the drain and source of the third switching element 33 are cut off, the emitter and base of the fourth switching element 34 are not connected, and the emitter and collector of the fourth switching element 34 are cut off. The circuit connection between the power input terminal and the power output terminal is disconnected by the fourth switching element 34, i.e., the PNP transistor, stopping the power supply to the circuits and sensors in the subsequent drilling instrument.

[0089] This invention proposes an over-temperature protection device for drilling instruments, which, through discrete components, further broadens the formation temperature range that the drilling instrument can serve in drilling applications and improves its adaptability to formation temperatures.

[0090] This utility model embodiment also provides a drilling instrument, which includes the over-temperature protection device of the drilling instrument as described in any of the above embodiments.

[0091] Next, refer to Figure 3 This describes a drilling instrument according to an embodiment of the present invention.

[0092] like Figure 3 As shown, the drilling instrument includes: a temperature detection module 110, a voltage feedback module 120, a power switch module 130, a power supply 200, and the drilling instrument body 300. The temperature detection module 110, voltage feedback module 120, and power switch module 130, serving as the over-temperature protection circuit for the drilling instrument, are installed between the power supply 200 and the drilling instrument body 300. The power supply 200 serves as the power supply for the drilling instrument and also provides power to the over-temperature protection circuit. The over-temperature protection circuit monitors the ambient temperature of the drilling instrument and controls the power supply 200 to turn on and off.

[0093] The temperature detection module 110 serves as the system's temperature sensing unit, used to collect temperature information of the working environment or itself of the drilling instrument. Its output is connected to the voltage feedback module 120, transmitting the temperature detection signal to the voltage feedback module 120.

[0094] The voltage feedback module 120 receives the temperature detection signal from the temperature detection module 110, processes the signal by combining internal voltage control and feedback adjustment, and connects the output terminal to the power switch module 130 to transmit the voltage control signal to it.

[0095] One end of the power switch module 130 is connected to the power supply 200 to receive the electrical energy input from the power supply 200; the other end is connected to the drilling instrument body 300, and is responsible for controlling the power supply 200 to the drilling instrument body 300 to switch on and off according to the signal of the voltage feedback module 120, so as to realize power management.

[0096] The power supply 200 provides electrical energy input for the entire system, which includes the temperature detection module 110, voltage feedback module 120, power switch module 130, and drilling instrument body 300. It is the energy source for the system operation.

[0097] The drilling instrument body 300 is the core equipment for drilling operations. It receives electrical energy from the power switch module 130 and performs functions such as drilling measurement and data acquisition. Its working status is controlled by the power switch module 130.

[0098] During drilling, power supply 200 continuously outputs electrical energy, and temperature detection module 110 continuously monitors the temperature, converting the physical quantity of temperature into an electrical signal and transmitting it to voltage feedback module 120. This provides temperature data for subsequent power control (e.g., adjusting the power supply strategy when high temperatures occur). Voltage feedback module 120 integrates the temperature signal and voltage status, analyzes and adjusts them, and generates an appropriate voltage control signal. Power switch module 130 receives the voltage control signal from voltage feedback module 120 and executes the power supply switching operation from power supply 200 to the drilling instrument 300. When normal operating temperature conditions are met, power is supplied; the drilling instrument 300 then receives power and performs drilling operations, realizing functions such as logging and geological parameter acquisition. If normal operating temperature conditions are not met, power supply is cut off or adjusted to protect the drilling instrument 300, thus providing over-temperature protection and ensuring that the drilling instrument 300 always operates within a reasonable temperature environment.

[0099] Finally, it should be noted that the above technical solution is only one implementation of this utility model. For those skilled in the art, based on the application methods and principles disclosed in this utility model, it is easy to make various types of improvements or modifications, and not limited to the methods described in the above specific implementation of this utility model. Therefore, the methods described above are only preferred and do not have a limiting meaning.

Claims

1. An over-temperature protection device for a drilling instrument, characterized in that: The over-temperature protection device includes: a temperature detection module, a voltage feedback module, and a power switch module; The output terminal of the temperature detection module is connected to the input terminal of the voltage feedback module. The temperature detection module is used to detect the current temperature of the drilling instrument and output the corresponding temperature detection signal. The first output terminal of the voltage feedback module is connected to the control terminal of the power switch module, and the second output terminal of the voltage feedback module is connected to the input terminal of the voltage feedback module; the voltage feedback module is used to output a voltage control signal to the control terminal of the power switch module based on the temperature detection signal, and to feed back the voltage control signal to the input terminal of the voltage feedback module. The power switch module is used to activate or deactivate the circuit connection between the input and output terminals of the power switch module according to the voltage control signal, so as to control the power signal input to the drilling instrument.

2. The over-temperature protection device for drilling instruments according to claim 1, characterized in that: The temperature detection module includes: a first resistor, a second resistor, a thermistor, and a first diode; the first resistor, the second resistor, and the thermistor each have a first terminal and a second terminal, and the first diode has a positive terminal and a negative terminal; The first end of the first resistor is connected to the circuit power supply, and the second end is connected to the negative terminal of the first diode, while the positive terminal of the first diode is grounded; the second resistor and the thermistor are connected in series between the second end of the first resistor and ground.

3. The over-temperature protection device for drilling instruments according to claim 2, characterized in that: The first diode is a Zener diode, and the thermistor is either a negative temperature coefficient thermistor or a positive temperature coefficient thermistor.

4. The over-temperature protection device for drilling instruments according to claim 3, characterized in that: When the thermistor is a positive temperature coefficient thermistor, the first terminal of the thermistor is connected to the reference node after the Zener diode is clamped, the second terminal of the thermistor is connected to the first terminal of the second resistor, and the second terminal of the second resistor is grounded.

5. The over-temperature protection device for drilling instruments according to claim 3, characterized in that: When the thermistor is a negative temperature coefficient thermistor, the first end of the second resistor is connected to the reference node after the Zener diode is clamped, the second end of the second resistor is connected to the first end of the thermistor, and the second end of the thermistor is grounded.

6. The over-temperature protection device for drilling instruments according to claim 1, characterized in that: The voltage feedback module includes: a third resistor, a fourth resistor, a fifth resistor, a first switching element, a second switching element, and a second diode; the third resistor, the fourth resistor, and the fifth resistor each have a first terminal and a second terminal, the second diode has a positive terminal and a negative terminal, and the first switching element and the second switching element each have a switching terminal, an input terminal, and an output terminal; The first ends of the fourth resistor and the fifth resistor are both connected to the circuit power supply. The second end of the fourth resistor is connected to the input terminal of the first switching element, and the second end of the fifth resistor is connected to the input terminal of the second switching element. The output terminals of the first switching element and the second switching element are both grounded. The second end of the fifth resistor is connected to the control terminal of the power switch module. The input terminal of the first switching element is connected to the control terminal of the second switching element, and the control terminal of the first switching element is connected to the output terminal of the temperature detection module. The third resistor and the second diode are connected in series between the second end of the fifth resistor and the input terminal of the voltage feedback module.

7. The over-temperature protection device for drilling instruments according to claim 6, characterized in that: The first switching element and the second switching element are N-channel metal-oxide-semiconductor field-effect transistors.

8. The over-temperature protection device for drilling instruments according to claim 6, characterized in that: The power switch module includes: a sixth resistor, a third switching element, and a fourth switching element; the third switching element and the fourth switching element each include a switching terminal, an input terminal, and an output terminal; the sixth resistor has a first terminal and a second terminal; The third switching element's switching terminal is connected to the second terminal of the fifth resistor, the input terminal of the third switching element is connected to the switching terminal of the fourth switching element, the input terminal of the fourth switching element is connected to the circuit power supply, and the output terminal of the fourth switching element is connected to the drilling instrument.

9. The over-temperature protection device for drilling instruments according to claim 8, characterized in that: The third switching element is an N-channel metal-oxide-semiconductor field-effect transistor, and the fourth switching element is a PNP transistor.

10. A drilling instrument, characterized in that, The drilling instrument includes an over-temperature protection device for the drilling instrument as described in any one of claims 1-9.

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