A high temperature downhole power device

Abstract

The utility model discloses a high temperature downhole power supply device, including output interface, upper shell, lower shell, main drive power supply, spare drive power supply, control board power supply, main control board, drive board, single core cable input interface, main drive power supply, spare drive power supply all are arranged in the middle of upper shell and lower shell, single core cable input interface electricity is connected control board power supply, and power supply supplies power to main control board, and main control board controls drive board drive, and drive board controls the switch of main drive power supply, spare drive power supply respectively. The utility model discloses dual power module parallel operation and possesses the redundancy switching function, eliminates the single point failure risk, sets up main control unit, real -time monitoring battery voltage, current, temperature, prevents overcharge, overdischarge, overcurrent, short circuit, effectively overcomes the performance degradation and failure risk under the severe working condition such as high temperature, high pressure and strong vibration.

Description

Technical Field

[0001] This utility model relates to the field of power supply, and in particular to a high-temperature downhole power supply device. Background Technology

[0002] In downhole operations such as oil and gas drilling, instruments need to operate in extreme environments with high temperatures, high pressures, and strong vibrations, posing significant challenges to their power systems. Currently, downhole instruments generally rely on surface power solutions powered by long cables, making the core downhole power conversion module crucial.

[0003] However, existing downhole power conversion devices have significant drawbacks:

[0004] 1. Poor environmental tolerance: Conventional components and designs are prone to failure under extreme high temperature and high pressure, resulting in insufficient reliability.

[0005] 2. Low conversion efficiency: Under high temperature and high pressure conditions, losses increase significantly, efficiency decreases, and the heat dissipation burden is aggravated.

[0006] 3. Insufficient reliability: Most systems use a single switching path and lack redundancy design, so a single point of failure can lead to system paralysis. Utility Model Content

[0007] The purpose of this invention is to address the problems in the prior art by proposing a high-temperature downhole power supply device.

[0008] A high-temperature downhole power supply device includes an output interface, an upper housing, a lower housing, a main drive power supply, a backup drive power supply, a control board power supply, a main control board, a drive board, and a single-core cable input interface.

[0009] Both the main drive power supply and the backup drive power supply are located between the upper and lower outer shells;

[0010] The single-core cable input interface is electrically connected to the power supply of the control board, which supplies power to the main control board. The main control board controls the drive board, and the drive board controls the switching of the main drive power supply and the backup drive power supply respectively.

[0011] The upper and lower outer shells serve to provide waterproofing and sealing.

[0012] The output interface can provide 500V DC and 2A current to power various equipment units downhole.

[0013] The device provides two power sources, detects various power supply performances, determines the quality of the power supply, decides which power source to use, and solves the current limiting problem.

[0014] Furthermore, a high-temperature downhole power supply device is provided, wherein the output interface is electrically connected to downhole equipment.

[0015] Furthermore, a high-temperature downhole power supply device, wherein the drive board includes semiconductor discrete devices and MOS transistor drive chips.

[0016] Furthermore, a high-temperature downhole power supply device, wherein the drive board includes four discrete semiconductor devices and two MOS transistor drive chips.

[0017] Furthermore, a high-temperature downhole power supply device, wherein the main control board includes a current acquisition circuit, a differential amplifier circuit, an active low-pass filter, and a main control unit.

[0018] The main control unit monitors battery voltage, current, and temperature in real time under high temperature and harsh environments to prevent overcharging, over-discharging, overcurrent, short circuits, and high / low temperature charging and discharging, ensuring that the power supply operates within a safe range and preventing the risk of thermal runaway.

[0019] Furthermore, a high-temperature downhole power supply device includes a current acquisition circuit comprising a current acquisition sensor R1.

[0020] Furthermore, a high-temperature downhole power supply device, wherein the differential amplifier circuit includes resistors R9, R10, R11, and R12, and an operational amplifier forming a non-inverting proportional amplifier U3A.

[0021] Furthermore, a high-temperature downhole power supply device, wherein the active low-pass filter comprises resistors R5, R6, R7, and R8, capacitors C3 and C4, and an operational amplifier forming a comparator amplifier U3B.

[0022] The beneficial effects of this invention are as follows: By setting up a main control unit, the battery voltage, current, and temperature are monitored in real time to prevent overcharging, over-discharging, overcurrent, and short circuits. This effectively overcomes the risk of performance degradation and failure under harsh conditions such as high temperature, high pressure, and strong vibration, and significantly improves the long-term operational reliability of the power module. The optimized circuit topology and control strategy effectively reduce conduction losses, switching losses, and core losses under high temperature and high pressure conditions, significantly improving power conversion efficiency and reducing the system's heat dissipation burden and the pressure on ground power supply. The dual power modules work in parallel and have redundant switching functions, eliminating the risk of single-point failure. When any module fails, it can seamlessly switch to the backup module for continuous power supply, ensuring the continuity and stability of the power supply for downhole instruments. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model.

[0024] Figure 2 This is a schematic diagram of the driver board circuit.

[0025] Figure 3 This is a schematic diagram of the main control board circuit.

[0026] In the diagram, 1-output interface, 2-upper casing, 3-lower casing, 4-main drive power supply, 5-backup drive power supply, 6-control board power supply, 7-main control board, 8-drive board, 9-single-core cable input interface. Detailed Implementation

[0027] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described with reference to the accompanying drawings.

[0028] Specific Embodiment 1: Structure and Principle of High-Temperature Downhole Power Supply Device

[0029] As attached Figure 1 As shown, a high-temperature downhole power supply device has the following structure:

[0030] Includes output interface 1, upper shell 2, lower shell 3, main drive power supply 4, backup drive power supply 5, control board power supply 6, main control board 7, drive board 8, and single-core cable input interface 9.

[0031] The main drive power supply 4 and the backup drive power supply 5 are both located between the upper outer casing 2 and the lower outer casing 3;

[0032] The single-core cable input interface 9 is electrically connected to the control board power supply 6. The power supply 6 supplies power to the main control board 7. The main control board 7 controls the drive board 8. The drive board 8 controls the switching of the main drive power supply 4 and the backup drive power supply 5 respectively.

[0033] Output interface 1 is electrically connected to downhole equipment.

[0034] A high-temperature downhole power supply device, the principle of which is as follows:

[0035] When the ground power supply is powered on, it enters the device through the single-core cable input interface 9. At this time, the control board power supply 6 starts to work first to provide auxiliary power to the main control board 7. The main control board 7 sends positive or negative drive signals to the drive board 8. The signal amplitude and power are provided by the main drive power supply 4 and output to the output interface 1 through the MOS transistor drive chip. When the device malfunctions or the drive power supply 4 is damaged, the backup drive power supply 5 is started through the forced start function for emergency work. Usually, the backup drive power supply 5 is triggered by a specific high voltage and maintained for a certain period of time, but the premise is that the main control board 7 and the drive board 8 are not damaged.

[0036] Specific Embodiment Two: Circuit Structure and Principle of High-Temperature Downhole Power Supply Device

[0037] As attached Figure 2 As shown, the driver board 8 includes four discrete semiconductor devices and two MOSFET driver chips, forming a full-bridge motor drive circuit. The main control unit outputs PWM to achieve braking control.

[0038] As attached Figure 3 As shown, the main control board 7 includes a current acquisition circuit, a differential amplifier circuit, an active low-pass filter, and a main control unit;

[0039] The current acquisition circuit includes a current acquisition sensor R1, which acquires the current magnitude. The acquired signal is then transmitted to the main control unit for analog-to-digital conversion via a differential amplifier circuit and an active low-pass filter, thereby completing the current signal acquisition.

[0040] The differential amplifier circuit includes resistors R9, R10, R11, and R12, and an operational amplifier forming a non-inverting proportional amplifier U3A. The differential amplifier circuit amplifies weak signals.

[0041] The active low-pass filter consists of resistors R5, R6, R7, and R8, capacitors C3 and C4, and an operational amplifier forming a comparator amplifier U3B. The active low-pass filter eliminates high-frequency interference signals.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A high-temperature downhole power supply device, characterized in that, Includes output interface (1), upper shell (2), lower shell (3), main drive power supply (4), backup drive power supply (5), control board power supply (6), main control board (7), drive board (8), and single-core cable input interface (9). The main drive power supply (4) and the backup drive power supply (5) are both located between the upper outer shell (2) and the lower outer shell (3); The single-core cable input interface (9) is electrically connected to the power supply (6) of the control board. The power supply (6) supplies power to the main control board (7). The main control board (7) controls the drive board (8) to drive. The drive board (8) controls the switching of the main drive power supply (4) and the backup drive power supply (5) respectively.

2. The high-temperature downhole power supply device as described in claim 1, characterized in that, The output interface (1) is electrically connected to the downhole equipment.

3. The high-temperature downhole power supply device as described in claim 1, characterized in that, The driver board (8) includes discrete semiconductor devices and MOS transistor driver chips.

4. The high-temperature downhole power supply device as described in claim 3, characterized in that, The driver board (8) includes four discrete semiconductor devices and two MOS transistor driver chips.

5. The high-temperature downhole power supply device as described in claim 1, characterized in that, The main control board (7) includes a current acquisition circuit, a differential amplifier circuit, an active low-pass filter, and a main control unit.

6. The high-temperature downhole power supply device as described in claim 5, characterized in that, The current acquisition circuit includes a current acquisition sensor R1.

7. The high-temperature downhole power supply device as described in claim 5, characterized in that, The differential amplifier circuit includes resistors R9, R10, R11, and R12, and an operational amplifier forming a non-inverting proportional amplifier U3A.

8. The high-temperature downhole power supply device as described in claim 5, characterized in that, The active low-pass filter includes resistors R5, R6, R7, and R8, capacitors C3 and C4, and an operational amplifier forming a comparator amplifier U3B.

Images