Circuit skeleton for downhole tractor

Abstract

The utility model discloses a kind of circuit skeletons for underground tractor, solve the problem that the heat exchange efficiency is low when existing tractor circuit bin underground operation, safety needs to be further improved. Technical scheme includes circuit skeleton for underground tractor, including skeleton ontology, the front end of skeleton ontology is connected cooling bin, skeleton ontology has gas passage through in axial direction, the gas passage has front end opening and rear end opening, fan is equipped at the front end opening and is communicated with the rear end of cooling bin. The utility model is simple in structure, cooling efficiency is high, safety is good, especially suitable for circuit cooling of underground tractor operation, improve equipment service life.

Description

Technical Field

[0001] This utility model relates to a logging instrument in the petroleum field, specifically a circuit frame for a downhole traction device. Background Technology

[0002] With the depletion of traditional shallow oilfields both domestically and internationally, the trend in oil and gas exploration and development is shifting towards ultra-deep development, and high-temperature, high-pressure oilfield blocks are becoming increasingly common. As traction devices are continuously updated and iterated, the integration level of traction device circuits is increasing, and larger high-power devices are being used, making it increasingly difficult to ensure the reliability of traction device circuits in high-temperature well operations. Due to heat leakage from the external high-temperature environment and the self-heating of internal high-power electronic components, the internal temperature of the circuit compartment can rapidly exceed the temperature resistance threshold of the components, causing thermal failure of the components in the circuit, often preventing the completion of operations, and in severe cases, even damaging the instrument.

[0003] To address the aforementioned issues, CN204591255U discloses a ring-shaped heat-absorbing jacket for an oil well logging tool. This jacket includes a thermos flask and a circuit frame inside the flask. A jacket is located inside the thermos flask, with a gap between the flask and the jacket. The port of the thermos flask has a sealing cap with a through-hole. The circuit frame is located inside the jacket, and the heat-absorbing jacket surrounds it. A cooling pipe is located outside the heat-absorbing jacket, with the other end of the cooling pipe connected to a cooler. The cooler is connected to a compressor, which in turn is connected to a controller. This solution relies on the compressor to drive the cooler for cooling, and the cooling pipe further cools the circuit frame. However, this design is complex, occupies a large space, and the heat exchange efficiency via the cooling pipe and heat-absorbing jacket is limited, making it unsuitable for high-power equipment traction devices. For example, CN 105823272A discloses a cooling system for a downhole instrument in oil exploration. This system comprises a sealed system consisting of an upper connector, a metal heat-conducting and pressure-bearing connector, and a sealed outer shell. Inside this sealed system is a cooling system consisting of a motor, a pressure pump, a condenser, a shut-off pipe, and an evaporator. The evaporator is placed inside a thermos flask, and a circuit board is placed on the evaporator. The evaporator lowers the internal temperature of the thermos flask, making the internal temperature significantly lower than the external high-temperature, high-pressure mud temperature. A heat-absorbing agent is placed inside the thermos flask. In case of a malfunction in the cooling system, the heat-absorbing agent absorbs the heat inside the thermos flask. The thermos flask and the insulating asbestos isolate the heat conducted from the outside of the sealed outer shell, thus ensuring that the internal temperature of the thermos flask remains within a reasonable range for a certain period. The internal temperature of the thermos flask can be monitored in real time by an internal temperature sensor. In this scheme, a fluid channel is set inside the evaporator, and the refrigerant inside the fluid channel exchanges heat indirectly with the circuit board placed on the evaporator. This is essentially an indirect heat exchange, and the heat exchange efficiency is limited by the distribution of the fluid channel and the heat exchange area. Furthermore, the refrigerant absorbs heat by vaporizing, which results in a large volume change and a sharp increase in pressure inside the evaporator, further posing a safety hazard.

[0004] The high-power semiconductor devices used in the traction unit generate significant self-heating due to the need to withstand continuous high currents. Under the thermal shock of prolonged high current, these devices may experience chip electrode layer tearing and reliability issues. This heat requires efficient heat exchange and cooling; otherwise, the temperature of the circuit compartment will rise sharply, causing other components to malfunction at extremely high temperatures and potentially leading to circuit safety hazards. Summary of the Invention

[0005] The purpose of this utility model is to solve the above-mentioned technical problems and provide a circuit frame for a downhole traction device that is simple in structure, has high cooling efficiency, good safety, and is particularly suitable for traction devices.

[0006] The technical solution includes a frame body, the front end of which is connected to a cooling chamber. The frame body has an axially penetrating gas channel with a front opening and a rear opening. A fan is provided at the front opening and is connected to the rear end of the cooling chamber.

[0007] The cooling chamber is equipped with a cooling tank containing a cooling medium and a circulating air vent.

[0008] The gas channel is equipped with a filter filled with desiccant at its rear end opening.

[0009] The front end of the cooling chamber is sealed with a cover plate and fixed with screws.

[0010] A temperature sensor is also provided on the circuit frame.

[0011] The output of the temperature sensor is connected to the controller of the fan.

[0012] The circuit frame is provided with a circuit board mounting area and a high-power component mounting area.

[0013] The circuit frame of the high-power component mounting area is equipped with thermal pads and insulating pads.

[0014] The gas channels within the circuit frame are cylindrical or annular.

[0015] To address the problems in the background art, the present invention makes the following improvements: 1) The circuit frame is connected to the cooling chamber, so that the front opening of the gas channel inside the circuit frame is connected to the rear end of the cooling chamber. Powered by a fan, cold gas from the cooling chamber continuously enters the gas channel inside the circuit frame through the front opening. During its flow, the cold gas first lowers the temperature of the circuit frame and indirectly exchanges heat with the high-power electronic components on the frame. Then, it is directly led out from the rear opening to directly contact the components on the circuit frame for heat exchange and cooling, thus lowering the overall temperature of the circuit chamber and improving the safety of circuit operation. The heat-exchanged gas is then circulated back to the cooling chamber through a recirculation vent for further cooling. This combination of indirect and direct cooling throughout the circulation process results in high heat exchange efficiency and controllable airflow. Furthermore, a temperature sensor is also installed on the circuit frame within the circuit chamber. The cooled gas is confined within the cooling chamber by the cooling tank, preventing arbitrary release. Simultaneously, a temperature sensor monitors the temperature changes in the circuit chamber in real time. When the circuit chamber temperature exceeds a set range, the sensor sends a signal to the controller to activate the fan, directing the cooled air from the cooling chamber into the gas channels within the circuit frame for circulating cooling. When the circuit chamber temperature drops to the set range, the controller stops the fan, minimizing coolant consumption within the cooling tank. Furthermore, a filter filled with desiccant is installed at the rear opening of the gas channel to absorb water vapor or condensate generated during heat exchange between the cooled and hot air, drying the gas entering the circuit chamber and ensuring safe circuit operation.

[0016] 2) The frame body is improved by setting up internal gas channels for rapid cooling of the circuit frame and its components. At the same time, the layout of the components on the electronic frame is changed, with separate circuit board mounting areas and high-power component mounting areas. High-power components that were previously all mounted on the circuit board are now directly mounted on the circuit frame. Utilizing the characteristics of the circuit frame's high thermal conductivity, large area, and large heat capacity, it directly absorbs the heat generated by the high-power components, improving heat exchange efficiency. The circuit frame in the high-power component mounting area is equipped with thermal pads and insulating pads to improve insulation and thermal conductivity.

[0017] Beneficial effects: This utility model has a simple structure, high cooling efficiency, good safety, long downhole operation time, and is particularly suitable for cooling the circuit of the traction device, thereby improving the service life of the equipment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a schematic diagram showing the state of the present invention installed inside the circuit housing.

[0020] The components include: 1. Frame body; 1.1. Circuit board mounting area; 1.2. High-power component mounting area; 2. Gas channel; 3. Fan; 4. Cooling chamber; 4.1. Circulating air vent; 5. Cover plate; 6. Screws; 7. Rear end opening; 8. Front end opening; 9. Circuit board; 10. High-power component; 11. Temperature sensor; 12. Filter; 13. Cooling tank; 14. Circuit housing; 15. Circuit compartment. Detailed Implementation

[0021] The present invention will be further explained below with reference to the accompanying drawings: The front end of the frame body 1 is connected to the cooling chamber 4; the frame body 1 has an axially penetrating gas channel 2 (preferably the cross-section of the gas channel 2 is annular, with a larger heat exchange area), the gas channel 2 has a rear end opening 7 and a front end opening 8, a filter 12 filled with desiccant is provided at the rear end opening 7 to dry the gas entering the rear end opening 7 from the gas channel 2, a fan 3 is provided at the front end opening 8 and is connected to the rear end of the cooling chamber 4, the cooling chamber 4 is provided with a circulating air vent 4.1 that communicates with the outside, and a cooling tank 13 containing a cooling medium is provided in the cooling chamber 4. The cooling medium in the cooling tank 13 can be ethanol, ethylene glycol, ice water or ice. In this embodiment, ethylene glycol with a temperature of -10℃ is used.

[0022] The frame body 1 is provided with a circuit board mounting area 1.1 and a high-power component mounting area 1.2. The frame body 1 in the high-power component mounting area 1.2 is provided with a thermal pad and an insulating pad (not shown in the figure) to solve the problem of insulation between the high-power component and the frame body 1 and to improve the heat conduction effect. The frame body 1 is also provided with a temperature sensor 11. The output terminal of the temperature sensor 11 is connected to the controller of the fan 3. The controller receives the signal from the temperature sensor 11 and controls the start and stop of the fan 3.

[0023] In the installed state, both the frame body 1 and the cooling chamber 4 are installed inside the circuit housing 14, with the frame body 1 located in the circuit chamber 15 within the circuit housing 14. The front end of the cooling chamber 4 is encapsulated with a cover plate 5 and fixed with screws 6. If necessary, the rear end of the frame body 1 is connected to the rear end face of the circuit housing 14 via a threaded connection to ensure that the frame body 1 does not shake during movement.

[0024] Working principle: When the traction device is working underground, the circuit board 9 and high-power components 10 on the electronic skeleton 1 inside the circuit housing 14 will generate heat due to continuous operation. This heat is first absorbed by the low-temperature gas in the circuit chamber and the electronic skeleton 1. The temperature sensor 11 monitors the temperature inside the circuit chamber 15 in real time. When the temperature rises to the set value, it sends a control signal to the controller of the fan 3 to start the fan 3. The low-temperature gas in the cooling chamber 4 is blown out by the fan 3 in the direction of the fan airflow and sent to the gas channel 2 inside the electronic skeleton 1. The electronic skeleton 1 is cooled first, and then enters the circuit chamber 15 through the rear opening 7. The condensate that may be generated by the contact between the hot and cold gas in the gas channel 2 is absorbed by the filter 12 at the rear opening 7, so that the gas entering the circuit chamber 15 is kept dry and low-temperature, avoiding electrical insulation problems to the circuit board 9 and high-power components 10 and ensuring the safety of the circuit operation. The gas that has been heated in the circuit chamber 15 is circulated back to the cooling chamber 4 through the circulation vent 4.1 and indirectly heats up with the cooling medium in the cooling tank 13, forming low-temperature gas again, which is then sent back to the gas channel 2 by the fan 3. When the temperature inside the circuit compartment 15 drops to the set temperature, a control signal is sent to the controller of the fan 3 to turn off the fan 3. Since the cooling tank 13 is installed inside the cooling compartment 4, the cooling capacity is not easily lost when the fan 3 is not turned on, reducing the excessive consumption of coolant in the cooling tank 13 and helping to increase the operating time of the equipment.

[0025] When fan 3 is started, the low-temperature gas is first directed to cool the higher-temperature electronic skeleton 1 during the entire conveying process. The generated water vapor can be absorbed by filter 12, and then the circuit chamber 15 is cooled as a whole. Using gas as the cooling medium has better fluidity and dispersion, better safety in the heat exchange process, and high overall heat exchange efficiency.

Claims

1. A circuit frame for a downhole traction device, comprising a frame body, characterized in that, The front end of the frame body is connected to a cooling chamber. The frame body has an axially penetrating gas channel with a front opening and a rear opening. A fan is provided at the front opening and is connected to the rear end of the cooling chamber.

2. The circuit frame for the downhole traction device as described in claim 1, characterized in that, The cooling chamber is equipped with a cooling tank containing a cooling medium and a circulating air vent.

3. The circuit frame for the downhole traction device as described in claim 1, characterized in that, The gas channel is equipped with a filter filled with desiccant at its rear end opening.

4. The circuit frame for the downhole traction device as described in claim 1, characterized in that, The front end of the cooling chamber is sealed with a cover plate and fixed with screws.

5. The circuit frame for the downhole traction device as described in claim 1, characterized in that, A temperature sensor is also provided on the circuit frame.

6. The circuit frame for the downhole traction device as described in claim 5, characterized in that, The output of the temperature sensor is connected to the controller of the fan.

7. The circuit frame for a downhole traction device as described in any one of claims 1-6, characterized in that, The circuit frame is provided with a circuit board mounting area and a high-power component mounting area.

8. The circuit frame for the downhole traction device as described in claim 7, characterized in that, The circuit frame of the high-power component mounting area is equipped with thermal pads and insulating pads.

9. The circuit frame for the downhole traction device as described in claim 1, characterized in that, The gas channels within the circuit frame are cylindrical or annular.

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