Power supply module for lateral logging and use method

Abstract

The invention relates to the field of petroleum logging, and discloses a power supply module for lateral logging and a use method, a rectification filter circuit, an FPGA chip, a DA converter and a power amplification circuit are integrated in a power supply processing board, and due to the use of a large-scale integrated circuit, the board width is greatly reduced, the high-integration power supply module is realized, and the cost is reduced. The FPGA chip realizes sinusoidal waveform through the digital waveform and the D / A converter, a filter circuit is simplified, the large-scale FPGA chip is taken as a core, a series of logic functions such as digital waveform storage, serial port receiving, D / A control, gain control and state monitoring are realized, the waveform size is also controlled by the FPGA, the output of the D / A converter is controlled by the FPGA chip according to a gain command, and the output of the D / A converter is controlled by the FPGA chip. Therefore, the final output current meets the measurement requirements of an underground instrument, and the power supply module has the characteristics of high precision, quick response, stable output, small size, flexible arrangement and strong independence.

Description

Technical Field

[0001] The invention relates to the field of petroleum logging, in particular to a power supply module for lateral logging and a use method thereof. Background Art

[0002] Dual Lateral Logging is one of the conventional open hole logging items and has been widely used in oilfield logging exploration. Dual Lateral Logging is mainly used to measure formation resistivity Rt (resistivity of uninvaded formations or original formations) so as to determine the content of oil, gas and water in the formation in combination with other parameters (such as porosity, formation water resistivity Rw, etc.). Dual Lateral Logging is still in front-line service and has been well received by Party A due to its large detection depth, large measurement range and high measurement accuracy.

[0003] After the new generation of CPLOG system was put into use, the original dual lateral instrument was still in service. Its measurement principle requires 35Hz transmission power to be provided by the ground to form a deep detection electric field. When the interface box was redesigned to connect the original instrument, a new 35Hz power module was also required to match the dual lateral instrument operation.

[0004] The 35Hz power supply in the original ground system had low integration, many discrete components, a large circuit board, and a large heat sink of the same width on the back, which was too large in size and occupied too much space. Summary of the invention

[0005] In order to overcome the defects of the above-mentioned prior art, the purpose of the present invention is to provide a power supply module for lateral logging and a method of use, so as to solve the technical problems of low power supply integration, many separate components and excessive space occupation in the prior art.

[0006] The present invention is achieved through the following technical solutions:

[0007] A power supply module for lateral logging comprises a power supply processing board, an input transformer and an output transformer; the power supply processing board is provided with a rectifier filter circuit, an FPGA chip, a DA converter and a power amplifier circuit; the output end of the input transformer is connected to the input end of the rectifier filter circuit via the power supply processing board, the output end of the rectifier filter circuit is connected to the input end of the power amplifier circuit, the output end of the power amplifier circuit is connected to the input end of the output transformer via the power supply processing board; the output end of the FPGA chip is connected to the input end of the DA converter, and the output end of the DA converter is connected to the input end of the power amplifier circuit.

[0008] Preferably, a voltage / current monitoring circuit is also provided in the power processing board, the input end of the voltage / current monitoring circuit is connected to the output end of the power amplifier circuit, and the output end of the voltage / current monitoring circuit is connected to the input end of the FPGA chip.

[0009] Furthermore, a waveform storage unit, a control logic unit and a command receiving unit are provided in the FPGA chip; the output end of the voltage / current monitoring circuit is connected to the control logic unit, the control logic unit is connected to the input unit of the DA converter via the waveform storage unit, and the command receiving unit is used to receive the command signal.

[0010] Furthermore, the FPGA chip is also provided with a serial port module, which is used for inputting serial port communication, and the output end of the serial port module is connected to the command receiving unit via the FPGA chip.

[0011] A method for using a power module for lateral logging, based on the power module for lateral logging according to any one of claims 1 to 4, comprises the following process:

[0012] The AC voltage is input to the input transformer, and the output signal of the input transformer is input to the power processing board and forms a DC power supply through the rectifier and filter circuit. The DC power supply is input to the power amplifier circuit to drive the power amplifier circuit. At the same time, the FPGA chip generates a sinusoidal wave signal. The sinusoidal wave signal is waveform-gained after passing through the DA converter and driven to the output transformer through the power amplifier circuit to provide lateral power for the downhole instrument.

[0013] Preferably, the FPGA chip performs digital-to-analog conversion on the stored digital waveform under control logic to generate a sine wave signal.

[0014] Preferably, a 256-point sine waveform is stored in the FPGA chip.

[0015] Preferably, the serial port module provided on the FPGA chip is used to receive the command signal sent by the main control device of the logging software, and the FPGA chip decodes the command signal through the control logic.

[0016] Preferably, when the power amplifier circuit drives the output to the output transformer, the voltage / current monitoring circuit in the power processing board samples the output of the power amplifier circuit in real time and transmits it digitally to the FPGA chip. The FPGA chip determines whether the current output value is normal based on the feedback. When the output value determined by the FPGA chip is normal, it is output normally. Otherwise, the output waveform signal is fine-tuned.

[0017] Preferably, the FPGA chip performs sampling storage, control logic and command reception through the Verilog hardware design language.

[0018] Compared with the prior art, the present invention has the following beneficial technical effects:

[0019] The invention provides a power supply module for lateral logging. A rectifier filter circuit, an FPGA chip, a DA converter and a power amplifier circuit are integrated in a power processing board. Due to the use of a large-scale integrated circuit, the board width is greatly reduced, and a highly integrated power supply module is realized. The FPGA chip realizes a sine waveform through a digital waveform and a D / A converter, and the filter circuit is simplified. With a large-scale FPGA chip as the core, a series of logic functions such as digital waveform storage, serial port reception, D / A control, gain control, and state monitoring are realized. The waveform size is also controlled by the FPGA, which controls the output of the D / A converter according to a gain command, so that the final output current meets the measurement requirements of the downhole instrument, so that the power supply module has the characteristics of high precision, fast response, stable output, small size, flexible layout, and strong independence.

[0020] Furthermore, the voltage / current monitoring circuit will sample the output of the power amplifier circuit in real time and transmit it digitally to the FPGA. The FPGA will determine whether the current output value is normal based on the feedback, thereby fine-tuning the output waveform signal and performing open circuit and short circuit protection processing.

[0021] Furthermore, the FPGA chip is also provided with a serial port module, which is used for inputting serial port communication. The output end of the serial port module is connected to the command receiving unit via the FPGA chip, and the gain control command is transmitted through the serial port, which saves a lot of resources compared with the parallel bus.

[0022] The present invention provides a method for using a power supply module for lateral logging, realizing all functions of multiple logic chips with a large-scale FPGA chip, storing 256 digital waveforms, outputting them to D / A conversion under clock drive, and forming a sine wave output. The serial port module is a peripheral communication interface of the FPGA chip, and a main control device such as logging software sends a command to the FPGA chip through the serial port. The FPGA performs corresponding command operations after decoding the command. The present invention integrates functions such as serial interface, command decoding, waveform storage, waveform generation control, output gain control, state monitoring, etc., and realizes high integration of the power supply module. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the power supply module used for lateral logging in the present invention;

[0024] Figure 2 This is a schematic diagram of the use principle of the power module used for lateral logging in the present invention;

[0025] In the figure: 1-power processing board; 2-rectifier filter circuit; 3-FPGA chip; 4-serial port module; 5-voltage / current monitoring circuit; 6-DA converter; 7-power amplifier circuit; 8-input transformer; 9-output transformer; 31-waveform storage unit; 32-control logic unit; 33-command receiving unit. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0027] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0028] The object of the present invention is to provide a power supply module for lateral logging and a method of using the same, so as to solve the technical problems in the prior art of low power supply integration, many separate components and excessive space occupation.

[0029] See also Figure 1 In one embodiment of the present invention, a power supply module for lateral logging is provided, including a power supply processing board 1, an input transformer 8 and an output transformer 9; the power supply processing board 1 is provided with a rectifier filter circuit 2, an FPGA chip 3, a DA converter 6 and a power amplifier circuit 7; the output end of the input transformer 8 is connected to the input end of the rectifier filter circuit 2 via the power supply processing board 1, the output end of the rectifier filter circuit 2 is connected to the input end of the power amplifier circuit 7, and the output end of the power amplifier circuit 7 is connected to the input end of the output transformer 9 via the power supply processing board 1; the output end of the FPGA chip 3 is connected to the input end of the DA converter 6, and the output end of the DA converter 6 is connected to the input end of the power amplifier circuit 7.

[0030] Specifically, a voltage / current monitoring circuit 5 is also provided in the power processing board 1, and the input end of the voltage / current monitoring circuit 5 is connected to the output end of the power amplifier circuit 7, and the output end of the voltage / current monitoring circuit 5 is connected to the input end of the FPGA chip 3.

[0031] Among them, the FPGA chip 3 is provided with a waveform storage unit 31, a control logic unit 32 and a command receiving unit 33; the output end of the voltage / current monitoring circuit 5 is connected to the control logic unit 32, the control logic unit 32 is connected to the input unit of the DA converter 6 via the waveform storage unit 32, and the command receiving unit 33 is used to receive the command signal.

[0032] The FPGA chip 3 is also provided with a serial port module 4 , which is used for inputting serial port communication, and the output end of the serial port module 4 is connected to the command receiving unit 33 via the FPGA chip 3 .

[0033] The present invention consists of a power processing board 1, an input transformer 8 and an output transformer 9. The circuit board is composed of an FPGA chip 3 as the core, and integrates functions such as serial interface, command decoding, waveform storage, waveform generation control, output gain control, and state monitoring. Due to the use of large-scale integrated circuits, the board width is greatly reduced to only 102*99mm.

[0034] according to Figure 2 As shown, the present invention also provides a method for using a power module for lateral logging, based on the above-mentioned power module for lateral logging, including the following process:

[0035] The AC voltage is input to the input transformer 8, and the output signal of the input transformer 8 is input to the power processing board 1, and forms a DC power supply through the rectifier and filter circuit 2. The DC power supply is input to the power amplifier circuit 7 to drive the power amplifier circuit 7. At the same time, the FPGA chip 3 generates a sinusoidal wave signal, and the sinusoidal wave signal is waveform-gained after passing through the DA converter 6, and is driven and output to the output transformer 9 through the power amplifier circuit 7 to provide lateral power for the downhole instrument.

[0036] Specifically, the FPGA chip 3 performs digital-to-analog conversion on the stored digital waveform under the control logic to generate a sine wave signal.

[0037] Specifically, the FPGA chip 3 stores a 256-point sine waveform, which is output to the D / A converter under clock drive to form a sine wave output.

[0038] Specifically, the serial port module 4 provided on the FPGA chip 3 is used to receive the command signal sent by the logging software main control device, and the FPGA chip 3 performs decoding operation on the command signal through the control logic.

[0039] Specifically, when the power amplifier circuit 7 drives the output to the output transformer 9, the voltage / current monitoring circuit 5 in the power processing board 1 samples the output of the power amplifier circuit in real time, and transmits it digitally to the FPGA chip 3. The FPGA chip 3 determines whether the current output value is normal based on the feedback. When the output value determined by the FPGA chip 3 is normal, it is output normally. Otherwise, the output waveform signal is fine-tuned.

[0040] Specifically, the FPGA chip 3 performs sampling storage, control logic and command reception through the Verilog hardware design language.

[0041] The present invention realizes all functions of multiple logic chips with large-scale FPGA chips; realizes more perfect sinusoidal waveforms through digital waveform + D / A converter mode, simplifies filtering circuits; transmits gain control commands through serial ports, saving a lot of resources compared with parallel buses.

[0042] Among them, with the large-scale FPGA chip 3 as the core, a series of logic functions such as digital waveform storage, serial port reception, D / A control, gain control, and state monitoring are realized; FPGA chip 3 controls the waveform size, and FPGA chip 3 controls the output of the D / A converter according to the gain command, so that the final output current meets the measurement requirements of the downhole instrument; monitor the output voltage and current of the power supply, and automatically cut off the power output when overcurrent or open circuit occurs, which can be restored by manual switch.

[0043] Example

[0044] This embodiment provides a 35Hz power supply module, which is mainly composed of three parts: a power processing board 1, an input transformer 8 and an output transformer 9. Among them, the input transformer 8 is responsible for reducing the voltage of 220V AC; the power processing board 1 is responsible for receiving the host control signal and outputting a controlled 35Hz power supply; the output transformer 9 isolates the output signal from the core circuit module.

[0045] Among them, the power processing board 1 is provided with a rectifier and filter circuit 2, an FPGA chip 3, a DA converter 6 and a power amplifier circuit 7; the output end of the input transformer 8 is connected to the input end of the rectifier and filter circuit 2 via the power processing board 1, the output end of the rectifier and filter circuit 2 is connected to the input end of the power amplifier circuit 7, and the output end of the power amplifier circuit 7 is connected to the input end of the output transformer 9 via the power processing board 1; the output end of the FPGA chip 3 is connected to the input end of the DA converter 6, and the output end of the DA converter 6 is connected to the input end of the power amplifier circuit 7.

[0046] A voltage / current monitoring circuit 5 is also provided in the power processing board 1 , and the input end of the voltage / current monitoring circuit 5 is connected to the output end of the power amplifier circuit 7 , and the output end of the voltage / current monitoring circuit 5 is connected to the input end of the FPGA chip 3 .

[0047] The FPGA chip 3 is provided with a waveform storage unit 31, a control logic unit 32 and a command receiving unit 33; the output end of the voltage / current monitoring circuit 5 is connected to the control logic unit 32, the control logic unit 32 is connected to the input unit of the DA converter 6 via the waveform storage unit 32, and the command receiving unit 33 is used to receive the command signal.

[0048] The FPGA chip 3 is also provided with a serial port module 4 , which is used for inputting serial port communication, and the output end of the serial port module 4 is connected to the command receiving unit 33 via the FPGA chip 3 .

[0049] The workflow is as follows:

[0050] The 220V AC voltage is input to the input transformer 8, and the output signal of the input transformer 8 passes through the rectifier and filter circuit in the 35Hz power processing board to form a positive and negative 28V DC power supply for driving the power amplifier circuit.

[0051] The FPGA chip 3 of the power processing board 35 stores a 256-point sine waveform, and the 35Hz sine waveform it outputs passes through the DA converter as the control end of the power amplifier circuit;

[0052] The power amplifier circuit is controlled by the sinusoidal signal output by the DA, and the power output is performed by the 28V voltage output by the rectifier and filter circuit, so that it has a controllable 35Hz power output capability and provides appropriate 35Hz power for the downhole lateral instrument.

[0053] The voltage / current monitoring circuit 5 will sample the output of the power amplifier circuit in real time and transmit it digitally to the FPGA chip 3. The FPGA chip 3 determines whether the current output value is normal based on the feedback, thereby fine-tuning the output waveform signal and performing open circuit and short circuit protection processing.

[0054] The serial port module 4 is the peripheral communication interface of the FPGA chip 3. The main control equipment such as the logging software sends commands to the FPGA chip 4 through the serial port. The FPGA chip 4 decodes the commands and performs corresponding command operations.

[0055] The 35Hz power processing board is powered by a low voltage external power supply.

[0056] In this embodiment, the FPGA chip 3 identifies and executes corresponding actions, such as turning on and off the power supply, setting the current gain, etc. The FPGA chip 3 drives the waveform storage data through the 8.96K clock and sequentially inputs it into the dual D / A converter, and the output generates a 35Hz sine wave. The gain of this waveform is controlled by the reference signal generated by the D / A. The sine wave enters the power amplifier to drive the output transformer to achieve matching with the downhole load.

[0057] The voltage / current monitoring circuit 5 measures the output voltage and current of the driver, and outputs an alarm signal through the logic comparison circuit. After receiving the signal, the FPGA performs a logic operation and outputs a shutdown signal to reduce the module output to the minimum, and lights up the panel indicator light to achieve power overload and open circuit protection.

[0058] In this embodiment, the external +5V and ±12V power supplies have very low power consumption, and the serial port can flexibly select RS485 or RS232.

[0059] In summary, the present invention provides a power supply module for lateral logging and a method of use. A rectifier filter circuit, an FPGA chip, a DA converter and a power amplifier circuit are integrated in a power processing board. Due to the use of large-scale integrated circuits, the board width is greatly reduced, and a highly integrated power supply module is realized. The FPGA chip realizes a sinusoidal waveform through a digital waveform and a D / A converter, which simplifies the filter circuit. With a large-scale FPGA chip as the core, a series of logic functions such as digital waveform storage, serial port reception, D / A control, gain control, and state monitoring are realized. The waveform size is also controlled by the FPGA, which controls the output of the D / A converter according to the gain command, so that the final output current meets the measurement requirements of the downhole instrument, so that the power supply module has the characteristics of high precision, fast response, stable output, small size, flexible layout, and strong independence.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A power module for lateral logging, It is characterized in that The invention comprises a power processing board (1), an input transformer (8) and an output transformer (9); the power processing board (1) is provided with a rectifier filter circuit (2), an FPGA chip (3), a DA converter (6) and a power amplifier circuit (7); the output end of the input transformer (8) is connected to the input end of the rectifier filter circuit (2) via the power processing board (1), the output end of the rectifier filter circuit (2) is connected to the input end of the power amplifier circuit (7), the output end of the power amplifier circuit (7) is connected to the input end of the output transformer (9) via the power processing board (1); the output end of the FPGA chip (3) is connected to the input end of the DA converter (6), and the output end of the DA converter (6) is connected to the input end of the power amplifier circuit (7).

2. A power module for lateral logging according to claim 1, It is characterized in that The power processing board (1) is also provided with a voltage / current monitoring circuit (5), the input end of the voltage / current monitoring circuit (5) is connected to the output end of the power amplifier circuit (7), and the output end of the voltage / current monitoring circuit (5) is connected to the input end of the FPGA chip (3).

3. A power module for lateral logging according to claim 2, It is characterized in that The FPGA chip (3) is provided with a waveform storage unit (31), a control logic unit (32) and a command receiving unit (33); the output end of the voltage / current monitoring circuit (5) is connected to the control logic unit (32), the control logic unit (32) is connected to the input end of the DA converter (6) via the waveform storage unit (31), and the command receiving unit (33) is used to receive command signals.

4. A power module for lateral logging according to claim 3, It is characterized in that The FPGA chip (3) is also provided with a serial port module (4), and the serial port module (4) is used for inputting serial port communication, and the output end of the serial port module (4) is connected to the command receiving unit (33) via the FPGA chip (3).

5. A method for using a power module for lateral logging, based on the power module for lateral logging according to any one of claims 1 to 4, It is characterized in that The process includes the following: The AC voltage is input to the input transformer (8), the output signal of the input transformer (8) is input to the power processing board (1), and forms a DC power supply through the rectifier filter circuit (2), and the DC power supply is input to the power amplifier circuit (7) to drive the power amplifier circuit (7), and at the same time, the FPGA chip (3) generates a sine wave signal, the sine wave signal is subjected to waveform gain after passing through the DA converter (6), and is driven by the power amplifier circuit (7) to be output to the output transformer (9), so as to provide lateral power supply for the downhole instrument.

6. A method for using a power module for lateral logging according to claim 5, It is characterized in that The FPGA chip (3) performs digital-to-analog conversion on the stored digital waveform under control logic to generate a sine wave signal.

7. A method for using a power module for lateral logging according to claim 5, It is characterized in that The FPGA chip (3) stores 256-point sine waveforms.

8. A method for using a power module for lateral logging according to claim 5, It is characterized in that The serial port module (4) provided on the FPGA chip (3) is used to receive a command signal sent by a well logging software main control device, and the FPGA chip (3) performs a decoding operation on the command signal through control logic.

9. A method for using a power module for lateral logging according to claim 5, It is characterized in that When the power amplifier circuit (7) drives the output to the output transformer (9), the voltage / current monitoring circuit (5) in the power processing board (1) samples the output of the power amplifier circuit in real time and transmits it digitally to the FPGA chip (3). The FPGA chip (3) determines whether the current output value is normal based on the feedback. When the output value determined by the FPGA chip (3) is normal, the output is normal. Otherwise, the output waveform signal is fine-tuned.

10. The method for using a power module for lateral logging according to claim 5, It is characterized in that The FPGA chip (3) performs sampling storage, control logic and command reception through the Verilog hardware design language.

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