阅读说明：本技术 一种高温驱动器短节及其控制方法 (High-temperature driver short section and control method thereof ) 是由 卢祥明 余民 于 2020-12-24 设计创作，主要内容包括：本公开提供了一种高温驱动器短节及控制方法,包括：恒流充电电路、储能电路和驱动波形输出电路,恒流充电电路、储能电路、驱动波形输出电路依次连接；所述恒流充电电路和驱动波形输出电路均由PWM电路控制；所述恒流充电电路包括电流采集模块、第一PWM产生电路、MCU、第一驱动电路、第一MOS全桥电路、第一高频变压器和第一高频整流电路,所述电流采集模块、第一PWM产生电路、第一驱动电路、第一MOS全桥电路、第一高频变压器、第一高频整流电路依次连接,所述第一高频整流电路与储能电路相连；所述电流采集模块还与第一MOS全桥电路相连,所述第一PWM产生电路还与MCU相连接,所述MCU与驱动波形输出电路相连。(The utility model provides a high temperature driver nipple joint and control method, including: the constant current charging circuit, the energy storage circuit and the driving waveform output circuit are sequentially connected; the constant-current charging circuit and the driving waveform output circuit are controlled by a PWM circuit; the constant-current charging circuit comprises a current acquisition module, a first PWM (pulse-width modulation) generation circuit, an MCU (microprogrammed control unit), a first driving circuit, a first MOS (metal oxide semiconductor) full bridge circuit, a first high-frequency transformer and a first high-frequency rectifying circuit, wherein the current acquisition module, the first PWM generation circuit, the first driving circuit, the first MOS full bridge circuit, the first high-frequency transformer and the first high-frequency rectifying circuit are sequentially connected, and the first high-frequency rectifying circuit is connected with the energy storage circuit; the current acquisition module is further connected with a first MOS full-bridge circuit, the first PWM generation circuit is further connected with an MCU, and the MCU is connected with a driving waveform output circuit.)

1. A high temperature driver sub, comprising: the constant current charging circuit, the energy storage circuit and the driving waveform output circuit are sequentially connected; the constant-current charging circuit and the driving waveform output circuit are controlled by a PWM circuit;

the constant-current charging circuit comprises a current acquisition module, a first PWM (pulse-width modulation) generation circuit, an MCU (microprogrammed control unit), a first driving circuit, a first MOS (metal oxide semiconductor) full bridge circuit, a first high-frequency transformer and a first high-frequency rectifying circuit, wherein the current acquisition module, the first PWM generation circuit, the first driving circuit, the first MOS full bridge circuit, the first high-frequency transformer and the first high-frequency rectifying circuit are sequentially connected, and the first high-frequency rectifying circuit is connected with the energy storage circuit;

the current acquisition module is further connected with a first MOS full-bridge circuit, the first PWM generation circuit is further connected with an MCU, and the MCU is connected with a driving waveform output circuit.

2. The high temperature driver sub of claim 1, in which the energy storage circuit comprises a set of shunt capacitors.

3. The high-temperature driver sub according to claim 1, wherein the drive waveform output circuit comprises a second PWM generation circuit, an MCU, a second drive circuit, a second MOS full-bridge circuit, a second high-frequency transformer, and a second high-frequency rectification circuit; and the second MOS full-bridge circuit, the second high-frequency transformer and the second high-frequency rectifying circuit are sequentially connected.

4. The high-temperature driver sub according to claim 3, wherein the second MOS full-bridge circuit, the second driving circuit, and the second PWM generating circuit are connected in sequence; and the second PWM generating circuit is connected with the MCU.

5. The high-temperature driver sub of claim 4, in which the second PWM generation circuit is further connected to a feedback sampling circuit, the feedback sampling circuit being connected to a pulser.

6. The high-temperature driver sub according to claim 4, wherein the tank circuit is connected to the second MOS full bridge circuit.

7. A high-temperature driver pup joint control method is characterized by comprising the following steps: the constant-current charging circuit charges the energy storage circuit, and if the output instruction is not received, the driving waveform output circuit does not work; if receiving an output instruction, the voltage stored in the energy storage circuit is added to the driving waveform output circuit, and the driving waveform output circuit drives the pulser to work;

the driving waveform output circuit is controlled by a PWM circuit, and a controlled signal of the PWM circuit is generated by a constant current charging circuit.

8. The high-temperature driver pup joint control method according to claim 7, wherein the specific process of charging the energy storage circuit by the constant-current charging circuit is as follows:

DC power supply passes through the current acquisition module and adds first MOS full-bridge circuit, first MOS full-bridge circuit is driven by first drive circuit, first drive circuit drive produces the circuit control by first PWM, first PWM produces the controlled signal of circuit and derives from current acquisition module and MCU, first high frequency transformer is received in the output of first MOS full-bridge circuit, charges to energy storage circuit through first high frequency rectifier circuit.

9. The high-temperature driver pup joint control method according to claim 8, wherein the specific process of adding the voltage stored in the energy storage circuit to the driving waveform output circuit is as follows:

the voltage stored in the energy storage circuit is added to a second high-frequency transformer through a second MOS full-bridge circuit, and the high-frequency alternating voltage output by the second high-frequency transformer is rectified and filtered through a second high-frequency rectifying circuit and then drives a pulser to work;

and/or

And a feedback sampling circuit is also arranged between the second high-frequency rectifying circuit and the pulser, and the voltage waveform output by the second high-frequency rectifying circuit is output to the pulser through the feedback sampling circuit.

10. The high-temperature driver pup joint control method according to claim 9, wherein the driving waveform output circuit is controlled by a PWM circuit, and the specific process that the controlled signal of the PWM circuit is generated by a constant-current charging circuit is as follows:

the second MOS full-bridge circuit is driven by a second driving circuit, the second driving circuit is controlled by a second PWM generating circuit, and controlled signals of the second PWM generating circuit come from the MCU and the feedback sampling circuit.

Technical Field

The invention belongs to the field of high-temperature wireless drilling instruments for oilfield drilling, and particularly relates to a high-temperature driver pup joint and a control method thereof.

Background

The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.

The drilling fluid wireless while-drilling instrument transmits data through the change of pressure wave of the drilling fluid, the instrument for controlling the change of the pressure wave is a pulser, the pulser is equivalent to an electromagnetic valve, and the instrument for controlling the action of the pulser is a driver. The driver is a power circuit and the different pulsers are matched by the respective drivers. At present, the maximum working temperature of most drivers is 125 ℃, the depth of a well which can work is about 3000 meters, and for oil wells with the depth of more than 3000 meters, even 4000 and 6000 meters, instruments with higher temperature resistance are needed to be adopted to complete well drilling guiding. At present, the instrument is owned by only a few countries, most of oil-gas wells and shale gas wells in regions of Xinjiang, Qinghai, Sichuan and the like in China reach 6000 m in depth, and directional drilling is mainly implemented by purchasing or renting imported wireless drilling instruments, so that the cost is high, the maintenance period is long, and the instrument is very inconvenient.

Disclosure of Invention

The high-temperature driver short section and the control method thereof are provided for solving the problems, and the high-temperature driver short section is provided for solving the actual low temperature resistance of the driver of the existing drilling fluid wireless drilling instrument, and forms a 175 ℃ wireless drilling instrument together with other high-temperature short sections to adapt to the requirement of drilling a deep well.

According to some embodiments, the following technical scheme is adopted in the disclosure:

in a first aspect, the present disclosure provides a high temperature driver sub;

a high temperature driver sub comprising: the constant current charging circuit, the energy storage circuit and the driving waveform output circuit are sequentially connected; the constant-current charging circuit and the driving waveform output circuit are controlled by a PWM circuit;

the constant-current charging circuit comprises a current acquisition module, a first PWM (pulse-width modulation) generation circuit, an MCU (microprogrammed control unit), a first driving circuit, a first MOS (metal oxide semiconductor) full bridge circuit, a first high-frequency transformer and a first high-frequency rectifying circuit, wherein the current acquisition module, the first PWM generation circuit, the first driving circuit, the first MOS full bridge circuit, the first high-frequency transformer and the first high-frequency rectifying circuit are sequentially connected, and the first high-frequency rectifying circuit is connected with the energy storage circuit;

the current acquisition module is further connected with a first MOS full-bridge circuit, the first PWM generation circuit is further connected with an MCU, and the MCU is connected with a driving waveform output circuit.

In a second aspect, the present disclosure provides a high temperature driver sub control method;

the high-temperature driver pup joint control method comprises the following steps: the constant-current charging circuit charges the energy storage circuit, and if the output instruction is not received, the driving waveform output circuit does not work; if receiving an output instruction, the voltage stored in the energy storage circuit is added to the driving waveform output circuit, and the driving waveform output circuit drives the pulser to work;

the driving waveform output circuit is controlled by a PWM circuit, and a controlled signal of the PWM circuit is generated by a constant current charging circuit.

Compared with the prior art, the beneficial effect of this disclosure is:

1. the invention discloses a circuit which can output high power (larger than the maximum discharge power of a battery) instantly and output a maintaining voltage at a later stage by converting a 36V direct-current power supply, and achieves the purpose of driving a pulser (an electromagnetic valve).

2. This is disclosed and is gathered chip control drive nipple joint output different voltage waveforms and come the pulser that the matching performance is different through control MCU, PWM control circuit and high-order current.

3. The working temperature is increased to 175 ℃ by adopting a high-temperature discrete device and a special working method, so that the depth of the drilling fluid wireless drilling-while-drilling instrument can extend to 6000 meters.

4. The output waveform in the present disclosure is field programmable and is suitable for the operation of various pulsers.

5. The constant-current charging circuit disclosed by the invention adopts high-order current detection sampling, and the aims of reducing local temperature rise due to small virtual ground and sampling resistance are fulfilled.

6. The device can control the discharge current of the instrument power supply battery, prolong the service life of the battery and protect the safety of the battery.

7. The circuit composed of the constant-current charging circuit, the energy storage circuit and the driving waveform output circuit can instantly release rated power far larger than that of a power supply.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.

FIG. 1 is a circuit structure diagram of a high-temperature driver short section of the present embodiment;

the high-voltage power supply comprises a power supply, a high-level current detection circuit 1, a charging level PWM (pulse-width modulation), a charging level MCU (microprogrammed control unit) 2, a charging level PWM (pulse-width modulation), a charging level drive circuit 3, an MCU 4, a charging level MOS (metal oxide semiconductor) full-bridge circuit 5, a charging level MOS full-bridge circuit 6, a charging level high-frequency transformer 7, a charging level high-frequency rectification circuit 8, an energy storage capacitor 9, an output level PWM 10, an output level drive circuit 11, an output level MOS full-bridge circuit 12, an output level high-frequency transformer 13, an output level high-frequency rectification and filtering circuit 14.

The specific implementation mode is as follows:

the present disclosure is further described with reference to the following drawings and examples.

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Example one

Fig. 1 is a circuit structure diagram of a high-temperature driver pup joint of the present embodiment, and as shown in fig. 1, a high-temperature driver pup joint includes: the constant current charging circuit, the energy storage circuit and the driving waveform output circuit are sequentially connected; the constant-current charging circuit and the driving waveform output circuit are controlled by a PWM circuit;

the constant-current charging circuit comprises a current acquisition module, a first PWM (pulse-width modulation) generation circuit, an MCU (microprogrammed control unit), a first driving circuit, a first MOS (metal oxide semiconductor) full bridge circuit, a first high-frequency transformer and a first high-frequency rectifying circuit, wherein the current acquisition module, the first PWM generation circuit, the first driving circuit, the first MOS full bridge circuit, the first high-frequency transformer and the first high-frequency rectifying circuit are sequentially connected, and the first high-frequency rectifying circuit is connected with the energy storage circuit;

the current acquisition module is further connected with a first MOS full-bridge circuit, the first PWM generation circuit is further connected with an MCU, and the MCU is connected with a driving waveform output circuit.

The current acquisition module adopts high-order current detection 1, the first PWM generating circuit adopts charging level PWM2, the first driving circuit adopts charging level driving circuit 4, the first MOS full-bridge circuit selects charging level MOS full-bridge circuit 5, the first high-frequency transformer selects charging level high-frequency transformer 6, and the first high-frequency rectification circuit selects charging level high-frequency rectification circuit 7.

As one or more embodiments, the driving waveform output circuit includes a second PWM generation circuit, an MCU, a second driving circuit, a second MOS full bridge circuit, a second high frequency transformer, and a second high frequency rectification circuit; and the second MOS full-bridge circuit, the second high-frequency transformer and the second high-frequency rectifying circuit are sequentially connected.

As one or more embodiments, the second MOS full bridge circuit, the second driving circuit, and the second PWM generating circuit are connected in sequence; and the second PWM generating circuit is connected with the MCU.

In one or more embodiments, the second PWM generation circuit is further coupled to a feedback sampling circuit, which is coupled to the pulser.

In one or more embodiments, the tank circuit is connected to the second MOS full bridge circuit.

The second PWM generating circuit adopts output level PWM9, the second driving circuit adopts an output level driving circuit 10, the second MOS full bridge circuit adopts an output level MOS full bridge circuit 11, the second high-frequency transformer adopts an output level high-frequency transformer 12, and the second high-frequency rectifying circuit adopts an output level high-frequency rectifying and filtering circuit 13.

The purpose of this embodiment is to convert the 36V dc power into a circuit that can output a large power (larger than the maximum discharge power of the battery) instantly and output a sustain voltage later, so as to achieve the purpose of driving a pulser (a kind of electromagnetic valve). Because of the different performance of the various pulsers, it is desirable to drive short power-save outputs with different voltage waveforms to match the pulsers. To achieve the above object, the present driver circuit is realized in the following manner.

In the embodiment, the high-temperature driver short section mainly comprises a constant-current charging circuit, an energy storage circuit and a driving waveform output circuit, wherein the constant-current charging circuit and the driving waveform output circuit are controlled by a PWM circuit. The constant-current charging circuit consists of a high-order current detection 1, a charging stage PWM2, an MCU, two half-bridge charging stage driving circuits 4, a charging stage MOS full-bridge circuit 5, a charging stage high-frequency transformer 6 and a charging stage high-frequency rectifying circuit 7; the energy storage circuit consists of a group of parallel capacitors; the driving waveform output circuit consists of an output stage PWM9, an MCU, two half-bridge output stage driving circuits 10, an output stage MOS full-bridge circuit 11, an output stage high-frequency transformer 12 and an output stage high-frequency rectifying and filtering circuit 13.

The working mode is as follows: the 36V voltage (battery or generator) is charged to the energy storage capacitor bank 8 through a high-order current detection 1 acquisition chip, a charging stage MOS full-bridge circuit 5, a charging stage high-frequency transformer 6 and a charging stage high-frequency rectification circuit 7, the maximum charging current and the target charging voltage are determined by MCU, charging stage PWM2 and the high-order current detection 1 acquisition chip, in the circuit, the charging current is controlled to be 1A (the maximum discharging current of the lithium battery used by the wireless drilling instrument is 1.2A), the charging voltage is 50V (the voltage resistance of the capacitor is 63V, and the reduction of the rated voltage resistance value at high temperature is considered); the capacitor stores 50V direct current voltage, when receiving an output command, the voltage stored on the capacitor is output to a pulser (another short section) through an output stage MOS full bridge circuit 11, an output stage high frequency transformer 12 and an output stage high frequency rectifying and filtering circuit 13, and the output waveform is determined by the MCU, the feedback sampling circuit 14 and the output stage PWM 9.

If the device is properly selected, the circuit can achieve the purpose of driving the pup joint by the wireless drilling tool at 125 ℃. On the basis, the 175 ℃ driving circuit is realized, and the following method can be adopted:

1. selecting 175 ℃ devices, partially not having 175 ℃ nominal devices, selecting 150 ℃ or 125 ℃, simulating the devices in an actual circuit, and continuously electrifying for 48 hours under the environment of 175 ℃ to select usable devices.

2. And a high-end current acquisition mode is adopted, so that the virtual ground problem is solved, the resistance value of the sampling resistor is reduced, and the local temperature rise is reduced.

3. Selecting a half-bridge driving chip to ensure excellent driving waveform, and finding the zero crossing point time switching of the MOS full-bridge current by adopting a phase-shifting experimental fine adjustment mode to ensure that the full-bridge working efficiency is highest and the loss and the temperature rise are minimum;

4. the MOS tube with extremely small internal resistance is selected as a full-bridge device, the power device adopts an aluminum substrate mounting mode, and the high-frequency transformer and the inductor are mounted on an aluminum plate, so that the local temperature rise is reduced;

5. the micro-time sleep is adopted, all circuits are in working intervals, so that only 1 second is needed, and the MCU is used for controlling the circuits to enter a sleep state under the condition of not influencing normal triggering, so that the temperature rise is reduced and the electricity is saved;

6. by adopting the mode of transferring and compensating other devices by high-temperature devices, the working rated temperature of partial chips can be greatly improved when the power consumption is low, and the function is not influenced. Therefore, special voltage is output through the high-temperature power supply chip, for example, a 5V device supplies 4V, a 3.3V device supplies 2.7V and the like, and normal work of the device at 150 ℃ or even 125 ℃ in an environment of 175 ℃ can be realized.

The embodiment can be used for drilling directional wells in oil fields of more than 5000 meters, and solves the problem that the directional wells are drilled by high-price rented import instruments in the oil fields of Xinjiang, Qinghai, Sichuan and the like at present. The normal work of the driver short section under the environment of 175 ℃ is realized, besides the circuit needs to be reasonably designed and configured, the temperature performance of the driver short section is improved by adopting the 6 special methods in the development process, and the requirements of instruments are met.

Example two

The embodiment provides a high-temperature driver pup joint control method, which comprises the following steps: the constant-current charging circuit charges the energy storage circuit, and if the output instruction is not received, the driving waveform output circuit does not work; if receiving an output instruction, the voltage stored in the energy storage circuit is added to the driving waveform output circuit, and the driving waveform output circuit drives the pulser to work;

the driving waveform output circuit is controlled by a PWM circuit, and a controlled signal of the PWM circuit is generated by a constant current charging circuit.

As one or more embodiments, the specific process of charging the energy storage circuit by the constant-current charging circuit is as follows:

DC power supply passes through the current acquisition module and adds first MOS full-bridge circuit, first MOS full-bridge circuit is driven by first drive circuit, first drive circuit drive produces the circuit control by first PWM, first PWM produces the controlled signal of circuit and derives from current acquisition module and MCU, first high frequency transformer is received in the output of first MOS full-bridge circuit, charges to energy storage circuit through first high frequency rectifier circuit.

As one or more embodiments, the specific process of applying the voltage stored in the tank circuit to the driving waveform output circuit is as follows:

the voltage stored in the energy storage circuit is added to a second high-frequency transformer through a second MOS full-bridge circuit, and the high-frequency alternating voltage output by the second high-frequency transformer is rectified and filtered through a second high-frequency rectifying circuit and then drives a pulser to work;

in one or more embodiments, a feedback sampling circuit is further disposed between the second high-frequency rectification circuit and the pulser, and the voltage waveform output by the second high-frequency rectification circuit is output to the pulser through the feedback sampling circuit.

As one or more embodiments, the driving waveform output circuit is controlled by a PWM circuit, and the specific process of the controlled signal of the PWM circuit generated by the constant current charging circuit is as follows:

the second MOS full-bridge circuit is driven by a second driving circuit, the second driving circuit is controlled by a second PWM generating circuit, and controlled signals of the second PWM generating circuit come from the MCU and the feedback sampling circuit.

The current acquisition module adopts high-order current detection 1, the first PWM generating circuit adopts charging level PWM2, the first driving circuit adopts charging level driving circuit 4, the first MOS full-bridge circuit selects charging level MOS full-bridge circuit 5, the first high-frequency transformer selects charging level high-frequency transformer 6, and the first high-frequency rectification circuit selects charging level high-frequency rectification circuit 7. The second PWM generating circuit adopts output level PWM9, the second driving circuit adopts an output level driving circuit 10, the second MOS full bridge circuit adopts an output level MOS full bridge circuit 11, the second high-frequency transformer adopts an output level high-frequency transformer 12, and the second high-frequency rectifying circuit adopts an output level high-frequency rectifying and filtering circuit 13.

The specific implementation process is as follows:

36V DC power supply, through high-order current detection 1 chip add to charge level MOS pipe full bridge circuit 5, MOS full bridge circuit 5 is driven by drive circuit 4 that charges, charge level drive circuit 4 is by charge level PWM2 production circuit control, charge level PWM 2's controlled signal comes from high-order current detection 1 and MCU3, charge level MOS full bridge circuit 5's output is received charge level high frequency transformer 6, charge level high frequency rectifier circuit 7 through the energy storage capacitor 8 that charges. When a driving command is not received, the output stage circuit does not work, when an output command (the output command is from the MCU) is received, the voltage stored on the energy storage capacitor 8 is added to the output stage high-frequency transformer 12 through the output stage MOS full-bridge 11, the output stage MOS full-bridge 11 is driven by the output stage driving circuit 10, the output stage driving circuit 10 is controlled by an output stage PWM9 generating circuit, a controlled signal of the output stage PWM9 is from the MCU3 and the feedback sampling circuit 14, the high-frequency alternating voltage output by the output stage high-frequency transformer 12 is rectified and filtered by the output stage high-frequency rectifying and filtering 13 circuit, and the driving pulser 15 works.

The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.

Although the present disclosure has been described with reference to specific embodiments, it should be understood that the scope of the present disclosure is not limited thereto, and those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the present disclosure.