CN115037137A - Downhole power supply device and system suitable for ultra-high temperature - Google Patents

Abstract

The invention provides a downhole power supply device suitable for ultrahigh temperature, which comprises: the double-path input filter circuit is used for filtering at least two paths of externally connected input power supplies; the frequency selection circuit is connected with the two-way input filter circuit and is used for selecting the working frequency of the ultrahigh temperature resistant main controller; the soft start circuit is connected with the ultrahigh temperature resistant main controller and is used for controlling the soft start of the ultrahigh temperature resistant main controller; the pulse width control circuit is connected with the ultrahigh temperature resistant main controller and is used for carrying out current limiting control; and the output rectifying and filtering circuit is connected with the pulse width control circuit and is used for rectifying and filtering the output end. The invention has 24-48V input and +5V output; the output current can reach 5A, and a stable and reliable working power supply is provided for the underground measurement while drilling instrument; the two types of power supply of the turbine generator and the battery pack are supported, and a selection is provided for flexibly selecting a power supply mode for the ultra-high temperature measurement while drilling instrument; the high-temperature-resistant oil has ultrahigh temperature resistance and can be suitable for 200 ℃ underground environment.

Description

Downhole power supply device and system suitable for ultra-high temperature

technical field

The invention relates to the field of downhole measurement while drilling in oil and gas well engineering, in particular to a downhole power supply device and system suitable for ultra-high temperature.

Background technique

In the field of oil and gas well drilling and production, it is generally believed that wireless MWD instruments with a temperature resistance of 150°C and below are normal temperature grades, high temperature instruments with a temperature resistance of 175°C, and ultra-high temperature instruments with a temperature resistance of 200°C.

As the actual downhole ambient temperature such as ultra-deep wells and hot dry rocks is getting higher and higher, the demand for high-temperature and ultra-high-temperature measurement while drilling instruments is becoming more and more intense.

At present, the mainstream high-temperature wireless MWD instruments at home and abroad are rated at 175°C. Only some companies such as Schlumberger and Halliburton have developed ultra-high temperature measurement while drilling instruments with a temperature resistance of 200 °C. The main difficulty in the development of ultra-high temperature MWD instruments lies in the lack of temperature-resistant 200°C electronic components and ultra-high temperature anti-vibration sealing materials.

Conventional electronic components cannot work in a 200°C environment. The temperature resistance level of conventional electronic components is generally divided into 105 ° C, 125 ° C, and 150 ° C. The temperature resistance level of a small number of electronic components can reach 175 ° C, and a few electronic components can withstand temperatures above 200 ° C.

Therefore, the present invention provides a downhole power supply device and system suitable for ultra-high temperature.

SUMMARY OF THE INVENTION

The object of the present invention is to overcome the deficiencies of the prior art and provide a downhole power supply device suitable for ultra-high temperature, the device comprising:

A dual input filter circuit is used to filter at least two external input power supplies;

a frequency selection circuit, which is connected to the dual input filter circuit and is used to select the operating frequency of the ultra-high temperature resistant main controller;

a soft-start circuit, which is connected to the ultra-high temperature-resistant main controller and used to control the soft-start of the ultra-high temperature-resistant main controller;

a pulse width control circuit, which is connected to the ultra-high temperature resistant main controller for current limiting control;

An output rectifying and filtering circuit, which is connected to the pulse width control circuit, is used for rectifying and filtering the output end.

According to an embodiment of the present invention, the dual input filter circuit includes:

the fifth ultra-high temperature resistant diode, the first end of which is used as the first input end;

The sixth ultra-high temperature resistant diode, the first end of which is used as the second input end;

a first ultra-high temperature-resistant inductor, the first end of which is connected to the second end of the fifth ultra-high temperature-resistant diode and the second end of the sixth ultra-high temperature-resistant diode;

The first end of the first ultra-high temperature-resistant capacitor is connected to the second end of the first ultra-high temperature-resistant inductor, and the second end is connected to the ground.

According to an embodiment of the present invention, the frequency selection circuit includes:

a first ultra-high temperature resistance, the first end of which is connected to the output end of the dual input filter circuit;

The fifth ultra-high temperature-resistant capacitor, the first end of which is connected to the second end of the first ultra-high temperature-resistant resistor, and the second end is connected to the ground.

According to an embodiment of the present invention, the soft-start circuit includes:

a first ultra-high temperature resistance, the first end of which is connected to the output end of the dual input filter circuit;

The sixth ultra-high temperature-resistant capacitor is connected between the SS pin and the GND pin of the ultra-high temperature-resistant main controller;

The fourth ultra-high temperature resistant resistor is connected between the SS pin and the GND pin of the ultra-high temperature resistant main controller.

According to an embodiment of the present invention, the pulse width control circuit includes:

The second ultra-high temperature resistance resistor is connected between the VDD pin and the ISNS pin of the ultra-high temperature resistance main controller;

a first ultra-high temperature-resistant current limiting resistor, the first end of which is connected to the VDD pin of the ultra-high temperature-resistant main controller;

The first end of the third ultra-high temperature resistant resistor is connected to the ISNS pin of the ultra-high temperature resistant main controller, and the second end is connected to the second end of the first ultra-high temperature resistant current limiting resistor.

According to an embodiment of the present invention, the output rectification filter circuit includes:

The second ultra-high temperature-resistant inductor, the first end of which is connected to the ultra-high temperature-resistant FET connected to the ultra-high temperature-resistant main controller;

a first ultra-high temperature-resistant diode, the first end of which is connected to the first end of the second ultra-high temperature-resistant inductor;

The first end of the fourth ultra-high temperature-resistant capacitor is connected to the second end of the second ultra-high temperature-resistant inductor, and the second end is connected to the second end of the first ultra-high temperature-resistant diode.

According to an embodiment of the present invention, the apparatus further includes:

The driving circuit is used for driving the ultra-high temperature-resistant field effect transistor connected to the ultra-high temperature-resistant main controller.

According to an embodiment of the present invention, the apparatus further includes:

A feedback circuit, which is connected to the FB pin of the ultra-high temperature resistant main controller, is used for voltage feedback.

According to an embodiment of the present invention, the apparatus further includes:

A zero-pole compensation loop, which is connected between the COMP pin and the FB pin of the ultra-high temperature resistant main controller, is used for zero-pole compensation.

According to another aspect of the present invention, there is also provided a downhole power supply system suitable for ultra-high temperature, the system comprising:

The downhole power supply device suitable for ultra-high temperature according to any one of the above;

The shell with high heat dissipation is fully fitted with the metal skeleton of the underground power supply device suitable for ultra-high temperature, and the interior is potted with high thermal conductivity silica gel to increase the heat dissipation capacity.

The downhole power supply device and system suitable for ultra-high temperature provided by the present invention have the following advantages:

(1) The underground power supply device and system suitable for ultra-high temperature provided by the present invention have 24-48V input and +5V output.

(2) The output current of the downhole power supply device and system suitable for ultra-high temperature provided by the present invention can reach 5A, which provides a stable and reliable working power supply for the downhole measuring instrument while drilling.

(3) The downhole power supply device and system suitable for ultra-high temperature provided by the present invention supports two types of power supply: turbine generator and battery pack, providing options for flexible selection of power supply modes for ultra-high temperature MWD instruments.

(4) The underground power supply device and system suitable for ultra-high temperature provided by the present invention have the ability to withstand ultra-high temperature, and can be suitable for underground 200°C environment.

Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the description, claims and drawings.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the specification, and together with the embodiments of the present invention, are used to explain the present invention, and do not constitute a limitation to the present invention. In the attached image:

Fig. 1 shows a structural block diagram of a downhole power supply device suitable for ultra-high temperature according to an embodiment of the present invention;

FIG. 2 shows a circuit topology diagram of a downhole power supply device suitable for ultra-high temperature according to an embodiment of the present invention;

FIG. 3 shows a topology diagram of a dual-input filter circuit according to an embodiment of the present invention; and

FIG. 4 shows a topology diagram of a frequency selection circuit according to an embodiment of the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

There are not many domestic researches related to the high temperature measurement while drilling system equipment. Therefore, the purpose of the present invention is to provide an ultra-high temperature resistant downhole power supply device, which breaks through the working temperature range of the existing downhole switching power supply, which is generally -40°C to +150°C. ℃, the working temperature range is increased to 200℃, which provides technical support for the release of high-temperature MWD system instruments and equipment. Provide the required working power supply voltage for high temperature, ultra-high temperature measurement while drilling systems and other downhole measurement instruments. Meet the needs of ultra-high temperature measurement while drilling instruments for high temperature drilling such as high temperature and high pressure wells, dry hot rock, etc.

FIG. 1 shows a structural block diagram of a downhole power supply device suitable for ultra-high temperature according to an embodiment of the present invention.

As shown in FIG. 1 , the downhole power supply device suitable for ultra-high temperature includes a dual input filter circuit 101 , a frequency selection circuit 102 , a soft start circuit 103 , a pulse width control circuit 104 and an output rectification filter circuit 105 .

Specifically, the dual input filter circuit is used to filter at least two external input power supplies. The frequency selection circuit is connected with the dual input filter circuit, and is used to select the working frequency of the ultra-high temperature resistant main controller. The soft-start circuit is connected with the ultra-high temperature-resistant main controller, and is used to control the soft-start of the ultra-high temperature-resistant main controller. The pulse width control circuit is connected with the ultra-high temperature resistant main controller for current limiting control. The output rectification filter circuit is connected with the pulse width control circuit, and is used for rectification and filter processing of the output end.

In addition, the downhole power supply device suitable for ultra-high temperature also includes a drive circuit 106 , a feedback circuit 107 and a zero-pole compensation loop 108 .

In the actual downhole measurement while drilling system, the power source comes from the battery pack or the turbine generator, the output power of the battery pack is a fixed voltage, the output of a single battery is 3.6V, and the output voltage of the turbine generator varies with the displacement of drilling fluid. If it changes within a certain range, it needs to cooperate with the AC/DC conditioning module to output a fixed voltage, such as 48V or 24V. The working voltage required by the measurement and control circuit module of the MWD system is usually +5V and ±13.5V fixed DC voltages. The voltage output by the battery pack or the turbine generator cannot be used directly, so the downhole power supply device suitable for ultra-high temperature provided by the present invention is required to provide the specific voltage and current required for each measurement and control module. In one embodiment, the downhole power supply device suitable for ultra-high temperature can convert the DC power supply between 24V and 48V into multiple outputs such as 5V or ±13.5V.

To sum up, the downhole power supply device suitable for ultra-high temperature provided by the present invention can be used for downhole measurement while drilling scenarios at an ambient temperature of 200°C, and can also be applied to ultra-high temperature environments such as dry hot rocks and ultra-deep wells, and is a measurement-while-drilling instrument. A fundamental guarantee is provided, and the problem of stable and reliable power supply in an ultra-high temperature environment is solved, and the power conversion circuit of the present invention is small in size, high in conversion efficiency and high in reliability.

FIG. 2 shows a circuit topology diagram of a downhole power supply device suitable for ultra-high temperature according to an embodiment of the present invention. As shown in Figure 2, the downhole power supply device suitable for ultra-high temperature includes a dual input filter circuit, a frequency selection circuit, a soft start circuit, a pulse width control circuit and an output rectifier filter circuit.

Specifically, the ultra-high temperature-resistant main controller U1 adopts the standard PWM modulation chip TPS40200SHKJ with a temperature resistance of 200 °C. The capacitors in the underground power supply device suitable for ultra-high temperature use C0G series chip capacitors with a temperature resistance of 200 °C and PATT series precision resistors. Automotive thin film resistors, with an extreme temperature resistance of 250 °C and meeting AEC-Q200 standards, are suitable for ultra-high temperature underground power supply devices using high temperature resistant transformers, which can be used in a high temperature environment of +200 °C.

As shown in FIG. 2 and FIG. 3 , the dual-input filter circuit includes a fifth ultra-high temperature-resistant diode D5, a sixth ultra-high temperature-resistant diode D6, a first ultra-high temperature-resistant inductor L1, and a first ultra-high temperature-resistant capacitor C1.

Specifically, the first end of the fifth ultra-high temperature resistant diode D5 is used as the first input end; the first end of the sixth ultra-high temperature resistant diode D6 is used as the second input end; the first end of the first ultra-high temperature resistant inductor L1 is connected to The second end of the fifth ultra-high temperature resistant diode D5 and the second end of the sixth ultra-high temperature resistant diode D6 are connected. The first end of the first ultra-high temperature-resistant capacitor C1 is connected to the second end of the first ultra-high temperature-resistant inductor L1, and the second end of the first ultra-high temperature-resistant capacitor C1 is connected to the ground.

Specifically, the fifth ultra-high temperature resistant diode D5 and the sixth ultra-high temperature resistant diode D6 use Schottky diodes, the first ultra-high temperature resistant inductor L1 uses a fixed inductor, and the first ultra-high temperature resistant capacitor C1 uses a liquid tantalum capacitor. The fifth ultra-high temperature-resistant diode D5, the sixth ultra-high temperature-resistant diode D6, the first ultra-high temperature-resistant inductor L1 and the first ultra-high temperature-resistant capacitor C1 are all resistant to ultra-high temperature of 200°C. The recommended range of dual-channel DC input voltage is 22~48V, and the maximum current of the input filter circuit is 4A. The input voltage can meet the power requirements of the high temperature MWD system instrument.

In terms of device model, the fifth ultra-high temperature resistant diode D5 and the sixth ultra-high temperature resistant diode D6 use Schottky diode GB02SHT01-46, the first ultra-high temperature resistant inductor L1 uses 2100HT-100-V-RC, the first ultra-high temperature resistant diode Capacitor C1 selects 135D107X9060F6E3 for use.

Further, the dual input filter circuit can be connected to two input power sources at the same time, for example, the first input end is connected to the turbine generator for power supply, and the second input end is connected to the battery pack for power supply. When the output voltage of the turbine generator exceeds the supply voltage of the battery pack, the downhole power supply device suitable for ultra-high temperature is powered by the turbine generator. When the output voltage of the turbine generator is too low or cannot reach the supply voltage of the battery pack, the downhole power supply device suitable for ultra-high temperature is powered by the battery pack.

As shown in FIG. 2 and FIG. 4 , the frequency selection circuit includes: a first ultra-high temperature resistant resistor R1 and a fifth ultra-high temperature resistant capacitor C5 .

Specifically, the first end of the first ultra-high temperature resistance resistor R1 is connected to the output end of the dual input filter circuit; the first end of the fifth ultra-high temperature resistance capacitor C5 is connected to the second end of the first ultra-high temperature resistance resistor R1 , the second end of the fifth ultra-high temperature resistant capacitor C5 is connected to the ground.

Further, according to the formula F=1/R1×C5=118kHz. The working frequency range of the frequency selection circuit is 35-500kHz, and the selected working frequency of the high temperature resistant main controller U1 meets the working conditions.

In terms of device model, the first ultra-high temperature resistance R1 is 180K ohm, PATT series resistance, and the temperature resistance exceeds 200 ℃. The fifth ultra-high temperature resistant capacitor C5 selects C0G series 470pF multi-layer ceramic capacitors with a pressure of 100V.

As shown in FIG. 2 , the soft-start circuit includes: a first ultra-high temperature resistant resistor R1 , a sixth ultra-high temperature resistant capacitor C6 and a fourth ultra-high temperature resistant resistor R4 .

Specifically, the first end of the first ultra-high temperature resistance resistor R1 is connected to the output end of the dual input filter circuit. The sixth ultra-high temperature resistant capacitor C6 is connected between the SS pin and the GND pin of the ultra-high temperature resistant main controller U1; the fourth ultra-high temperature resistant resistor R4 is connected between the SS pin and the GND pin of the ultra-high temperature resistant main controller U1. between the feet. It should be noted that the SS pin is the soft-start pin, and the GND pin is the ground pin.

Further, under the conditions selected by the first ultra-high temperature resistance resistor R1, the soft-start time is related to the sixth ultra-high temperature resistance capacitor C6, which is also called the soft-start capacitor C _ss (nF), which is related to the sixth ultra-high temperature resistance capacitor C6. The relationship between the soft-start time t _ss is:

Among them, R is 105kΩ, and V _sst represents the soft-start voltage of the ultra-high temperature resistant main controller U1.

In terms of device model, the sixth ultra-high temperature resistant capacitor C6 uses C0G series 0.47uF, 50V multi-layer ceramic capacitors, and the fourth ultra-high temperature resistant resistor R4 uses PATT series 1M ohm, power 0.125W surface mount resistors. It should be noted that the resistors involved in the present invention can also be selected from GCR and HGCR series high temperature resistance resistors.

As shown in FIG. 2 , the pulse width control circuit includes: a second ultra-high temperature resistance resistor R2 , a first ultra-high temperature resistance current limiting resistor RS1 , and a third ultra-high temperature resistance resistance R3 .

Specifically, the second ultra-high temperature resistant resistor R2 is connected between the VDD pin and the ISNS pin of the ultra-high temperature resistant main controller U1; the first end of the first ultra-high temperature resistant current limiting resistor RS1 is connected to the ultra-high temperature resistant main controller The first end of the third ultra-high temperature resistance R3 is connected to the ISNS pin of the ultra-high temperature main controller U1, and the second end of the third ultra-high temperature resistance R3 is connected to the first ultra-high temperature resistance. The second end of the current limiting resistor RS1 is connected. It should be noted that the VDD pin is an input voltage pin, and the ISNS pin is an output voltage pin.

Further, the first ultra-high temperature resistance current limiting resistor RS1 is selected as a 30 milliohm, high temperature resistance current sensing resistor with a power of 1 watt, and the specific model is LT2010R0300FEB18. The working temperature range is -60℃～+275℃. The second ultra-high temperature resistance R2 is a 43K ohm, power 0.125W surface mount resistor. The third ultra-high temperature resistance R3 is a 2K ohm, power 0.125W surface mount resistor. Specifically, the use of current sensor resistors can be used to feedback current, and the use of surface mount resistors can utilize the pad area, increase the heat dissipation area of the resistor, and improve the heat dissipation effect.

According to the formula, the maximum current Imax=Vlim/RS1*(R2+R3)/R2, where Vlim is 100mV, and Imax=3.4A is calculated. If the maximum current needs to be further increased, the first ultra-high temperature resistant current limiting resistor RS1 can be reduced. For example, if the first ultra-high temperature resistant current limiting resistor RS1 is reduced to 0.02 ohms, Imax is 5.23A. In practical applications, the size of the current limiting resistor can be determined according to the current required by the load.

As shown in FIG. 2 , the output rectification filter circuit includes: a second ultra-high temperature resistant inductor L2 , a first ultra-high temperature resistant diode D1 and a fourth ultra-high temperature resistant capacitor C4 .

Specifically, the first end of the second ultra-high temperature resistant inductor L2 is connected to the ultra-high temperature resistant FET Q1 connected to the ultra-high temperature resistant main controller U1; the first end of the first ultra-high temperature resistant diode D1 is connected to the second ultra-high temperature resistant FET Q1. The first end of the ultra-high temperature resistant inductor L2 is connected; the first end of the fourth ultra-high temperature resistant capacitor C4 is connected to the second end of the second ultra-high temperature resistant inductor L2, and the second end of the fourth ultra-high temperature resistant capacitor C4 is connected to the first The second end of the ultra-high temperature resistant diode D1 is connected.

As shown in FIG. 2 , the downhole power supply device suitable for ultra-high temperature further includes: a driving circuit for driving the ultra-high temperature-resistant field effect transistor Q1 connected to the ultra-high temperature-resistant main controller U1.

Specifically, the driving circuit includes a fifth ultra-high temperature resistance resistor R5. The first end of the fifth ultra-high temperature resistance R5 is connected to the GDRV pin of the ultra-high temperature main controller U1, and the second end of the fifth ultra-high temperature resistance R5 is connected to the gate g of the ultra-high temperature field effect transistor Q1. It should be noted that the GDRV pin is a pin connected to an external PMOS field effect transistor.

In one embodiment, the maximum output current of the ultra-high temperature-resistant main controller U1 is about 200mA, which can directly drive the ultra-high temperature-resistant FET Q1 without a special drive circuit, and directly use a 0-ohm fifth ultra-high temperature-resistant resistor R5 That's it.

As shown in FIG. 2 , the downhole power supply device suitable for ultra-high temperature further includes: a feedback circuit, which is connected to the FB pin of the ultra-high temperature-resistant main controller U1 for voltage feedback.

Specifically, the feedback circuit includes a sixth ultra-high temperature resistance resistance R6 and a seventh ultra-high temperature resistance resistance R7. The first end of the sixth ultra-high temperature resistance R6 is connected to the FB pin of the ultra-high temperature main controller U1, and the second end of the sixth ultra-high temperature resistance R6 is connected to the output end of the underground power supply device suitable for ultra-high temperature connect. The first end of the seventh ultra-high temperature resistant resistor R7 is connected to the FB pin of the ultra-high temperature resistant main controller U1, and the second end of the seventh ultra-high temperature resistant resistor R7 is connected to the ground. It should be noted that the FB pin is a feedback pin.

Specifically, the output voltage of the underground power supply device suitable for ultra-high temperature is +5V. If the feedback reference voltage of the ultra-high temperature resistant main controller U1 is 0.708mV, then according to the resistance division relationship, Vout=0.708*(1+R6 /R7), when the seventh ultra-high temperature resistance R7 is selected to be 9.76k ohms, it is calculated that the sixth ultra-high temperature resistance R6 needs 1.62k ohms.

In terms of device model, the sixth ultra-high temperature resistance R6 and the seventh ultra-high temperature resistance R7 are respectively selected as PATT series high temperature thin film resistors with resistance values of 1.62K ohm and 9.76K ohm, and the power is 0.125W. .

As shown in Figure 2, the downhole power supply device suitable for ultra-high temperature also includes: a zero-pole compensation loop, which is connected between the COMP pin and the FB pin of the ultra-high temperature-resistant main controller U1 for performing zero-pole compensation.

Specifically, the zero-pole compensation loop includes an eighth ultra-high temperature resistance resistor R8, a seventh ultra-high temperature resistance capacitor C7, and an eighth ultra-high temperature resistance capacitor C8. The first end of the eighth ultra-high temperature resistant resistor R8 is connected to the COMP pin of the ultra-high temperature resistant main controller U1; the first end of the seventh ultra-high temperature resistant capacitor C7 is connected to the second end of the eighth ultra-high temperature resistant resistor R8 Connection, the second end of the seventh ultra-high temperature resistant capacitor C7 is connected to the FB pin of the ultra-high temperature resistant main controller U1; the eighth ultra-high temperature resistant capacitor C8 is connected to the COMP pin and the FB pin of the ultra-high temperature resistant main controller U1. between the feet.

Further, the resistance of the eighth ultra-high temperature resistance resistor R8 is 7.87K ohms, the seventh ultra-high temperature resistance capacitor C7 is 4700pF, and the eighth ultra-high temperature resistance capacitor C8 is 220pF.

According to another aspect of the present invention, there is also provided a downhole power supply system suitable for ultra-high temperature, which includes: a downhole power supply device suitable for ultra-high temperature and a high heat dissipation housing. Among them, the high heat dissipation shell is fully attached to the metal skeleton of the underground power supply device suitable for ultra-high temperature, and the interior is potted with high thermal conductivity silica gel to increase the heat dissipation capacity.

Specifically, in order to dissipate heat, the principle of thermal design of the circuit structure of the ultra-high temperature underground power supply device is to reverse the heat dissipation layout of the heating elements, and to carry out special thermal design for the ultra-high temperature resistant main controller and power switch, including increasing the PCB heat dissipation. The number of holes is 3-5 times of the conventional number, and copper is laid on the bottom of the ultra-high temperature resistant main controller in a large area. Between the components and the PCB, apply high thermal conductivity sealing and tightening silicone.

In order to improve its vibration resistance and at the same time increase the heat dissipation capacity of each component, a high heat dissipation shell is designed outside the underground power supply device suitable for ultra-high temperature. , The interior is all potted with high thermal conductivity silica gel, so as to increase the heat dissipation capacity of the power conversion module. In one embodiment, the high heat dissipation housing is an aluminum housing.

To sum up, the downhole power supply system suitable for ultra-high temperature can provide power conversion function for ultra-high temperature MWD instruments by optimizing ultra-high temperature electronic components, optimizing the thermal design of circuit structure, and improving heat dissipation performance.

To sum up, the downhole power supply device and system suitable for ultra-high temperature provided by the present invention have the following advantages:

(1) The underground power supply device and system suitable for ultra-high temperature provided by the present invention have 24-48V input and +5V output.

(2) The output current of the downhole power supply device and system suitable for ultra-high temperature provided by the present invention can reach 5A, which provides a stable and reliable working power supply for the downhole measuring instrument while drilling.

(3) The downhole power supply device and system suitable for ultra-high temperature provided by the present invention supports two types of power supply: turbine generator and battery pack, providing options for flexible selection of power supply modes for ultra-high temperature MWD instruments.

(4) The underground power supply device and system suitable for ultra-high temperature provided by the present invention have the ability to withstand ultra-high temperature, and can be suitable for underground 200°C environment.

It is to be understood that the disclosed embodiments of the invention are not limited to the specific structures, process steps or materials disclosed herein, but extend to equivalents of these features as understood by those of ordinary skill in the relevant art. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not meant to be limiting.

Reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, appearances of the phrases "one embodiment" or "an embodiment" in various places throughout the specification are not necessarily all referring to the same embodiment.

Although the disclosed embodiments of the present invention are as above, the content described is only an embodiment adopted to facilitate understanding of the present invention, and is not intended to limit the present invention. Any person skilled in the art to which the present invention belongs, without departing from the spirit and scope disclosed by the present invention, can make any modifications and changes in the form and details of the implementation, but the scope of patent protection of the present invention, The scope as defined by the appended claims shall still prevail.

Claims (10)

1. A downhole power supply device suitable for ultra-high temperature, is characterized in that, described device comprises: A dual input filter circuit is used to filter at least two external input power supplies; a frequency selection circuit, which is connected to the dual input filter circuit and is used to select the operating frequency of the ultra-high temperature resistant main controller; a soft-start circuit, which is connected to the ultra-high temperature-resistant main controller and used to control the soft-start of the ultra-high temperature-resistant main controller; a pulse width control circuit, which is connected to the ultra-high temperature resistant main controller for current limiting control; An output rectifying and filtering circuit, which is connected to the pulse width control circuit, is used for rectifying and filtering the output end. 2. The downhole power supply device suitable for ultra-high temperature as claimed in claim 1, wherein the dual input filter circuit comprises: the fifth ultra-high temperature resistant diode, the first end of which is used as the first input end; The sixth ultra-high temperature resistant diode, the first end of which is used as the second input end; a first ultra-high temperature-resistant inductor, the first end of which is connected to the second end of the fifth ultra-high temperature-resistant diode and the second end of the sixth ultra-high temperature-resistant diode; The first end of the first ultra-high temperature-resistant capacitor is connected to the second end of the first ultra-high temperature-resistant inductor, and the second end is connected to the ground. 3. The downhole power supply device suitable for ultra-high temperature as claimed in claim 1, wherein the frequency selection circuit comprises: a first ultra-high temperature resistance, the first end of which is connected to the output end of the dual input filter circuit; The fifth ultra-high temperature-resistant capacitor, the first end of which is connected to the second end of the first ultra-high temperature-resistant resistor, and the second end is connected to the ground. 4. The downhole power supply device suitable for ultra-high temperature according to claim 1, wherein the soft-start circuit comprises: a first ultra-high temperature resistance, the first end of which is connected to the output end of the dual input filter circuit; The sixth ultra-high temperature-resistant capacitor is connected between the SS pin and the GND pin of the ultra-high temperature-resistant main controller; The fourth ultra-high temperature resistant resistor is connected between the SS pin and the GND pin of the ultra-high temperature resistant main controller. 5. The downhole power supply device suitable for ultra-high temperature according to claim 1, wherein the pulse width control circuit comprises: The second ultra-high temperature resistance resistor is connected between the VDD pin and the ISNS pin of the ultra-high temperature resistance main controller; a first ultra-high temperature-resistant current limiting resistor, the first end of which is connected to the VDD pin of the ultra-high temperature-resistant main controller; The first end of the third ultra-high temperature resistant resistor is connected to the ISNS pin of the ultra-high temperature resistant main controller, and the second end is connected to the second end of the first ultra-high temperature resistant current limiting resistor. 6. The downhole power supply device suitable for ultra-high temperature according to claim 1, wherein the output rectification filter circuit comprises: The second ultra-high temperature-resistant inductor, the first end of which is connected to the ultra-high temperature-resistant FET connected to the ultra-high temperature-resistant main controller; a first ultra-high temperature-resistant diode, the first end of which is connected to the first end of the second ultra-high temperature-resistant inductor; The first end of the fourth ultra-high temperature-resistant capacitor is connected to the second end of the second ultra-high temperature-resistant inductor, and the second end is connected to the second end of the first ultra-high temperature-resistant diode. 7. The downhole power supply device suitable for ultra-high temperature according to claim 1, wherein the device further comprises: The driving circuit is used for driving the ultra-high temperature-resistant field effect transistor connected to the ultra-high temperature-resistant main controller. 8. The rotary steerable single bus transmission control device of claim 1, wherein the device further comprises: A feedback circuit, which is connected to the FB pin of the ultra-high temperature resistant main controller, is used for voltage feedback. 9. The downhole power supply device suitable for ultra-high temperature according to claim 1, wherein the device further comprises: A zero-pole compensation loop, which is connected between the COMP pin and the FB pin of the ultra-high temperature resistant main controller, is used for zero-pole compensation. 10. A downhole power supply system suitable for ultra-high temperature, characterized in that the system comprises: The downhole power supply device suitable for ultra-high temperature according to any one of claims 1-9; The shell with high heat dissipation is fully fitted with the metal skeleton of the underground power supply device suitable for ultra-high temperature, and the interior is potted with high thermal conductivity silica gel to increase the heat dissipation capacity.

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