Dual-frequency signal processing circuit of petroleum formation resistivity measuring instrument
By introducing preamplification, mixing and analog-to-digital conversion circuits into petroleum formation resistivity measurement instruments, the problems of large power consumption and complex circuit design are solved, and low-power consumption and efficient signal processing are achieved.
Patent Information
- Application Number
- CN202510448756.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-10
- Publication Date
- 2025-07-25
AI Technical Summary
The signal processing circuits of existing petroleum formation resistivity measurement instruments have problems such as large power consumption and complex circuit design.
The preamplifier circuit, reference frequency generation circuit, mixing circuit, dual-channel analog-to-digital converter circuit and MCU interface circuit are used to initially amplify and process the original voltage signal, and mix the reference frequency signal, combining analog-to-digital conversion and data processing, reduce the workload of the digital signal processor.
It reduces the power consumption of the circuit, simplifies the circuit design, improves the efficiency and accuracy of signal processing, and reduces the computing burden of the digital signal processor.
Smart Images
Figure CN120377818A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of oil and gas exploration, and particularly to a dual-frequency signal processing circuit for an oil formation resistivity measurement instrument. Background Art
[0002] The signal processing circuit of an oil formation resistivity measurement instrument is a key technology for achieving accurate geological evaluation. The main function of this circuit is to perform a series of processes on the original resistivity signals obtained through the measurement instrument to ensure the accuracy and reliability of the signals. These signals are then used to calculate the resistivity of the formation, and further to evaluate the oil saturation of the formation and determine the amount of movable oil. Through a carefully designed signal processing circuit, the efficiency of logging operations can be significantly improved, power consumption can be reduced, and the accuracy of data can be enhanced, thus playing a crucial role in oil exploration and development.
[0003] In the prior art solutions, a large number of analog devices are used, and at the same time, a digital signal processor undertakes a large amount of computing work, resulting in problems of high power consumption and complex circuit design. Summary of the Invention
[0004] Based on this, in view of the above technical problems, a dual-frequency signal processing circuit for an oil formation resistivity measurement instrument is provided to solve the problems of high power consumption and complex circuit design in the prior art.
[0005] In a first aspect, a dual-frequency signal processing circuit for an oil formation resistivity measurement instrument, the circuit includes: a pre-amplification circuit, a reference frequency generation circuit, a mixing circuit, a dual-channel analog-to-digital converter circuit, and an MCU interface circuit;
[0006] The pre-amplification circuit and the reference frequency generation circuit are respectively connected to the mixing circuit; the pre-amplification circuit is used to amplify and process the original voltage signal obtained from the oil formation resistivity measurement instrument; the reference frequency generation circuit is used to generate a reference frequency signal;
[0007] The mixing circuit is connected to the dual-channel analog-to-digital converter circuit; the mixing circuit is used to process the original mixed-frequency signal for obtaining the formation resistivity and resolve the required intermediate-frequency signal; the dual-channel analog-to-digital converter circuit is used to perform analog-to-digital conversion on the voltage signal processed by the mixing circuit to obtain a digital voltage signal;
[0008] The dual-channel analog-to-digital converter circuit is connected to the MCU interface circuit; the MCU interface circuit is used to process the digital voltage signal to obtain the phase and amplitude information of the resistivity after being transmitted through the formation and attenuated.
[0009] In the above solution, optionally, the reference frequency generation circuit generates reference frequency signals of 395KHz and 1.995MHz.
[0010] In the above solution, optionally, the MCU interface circuit is further provided with a bus interface, and the bus interface is connected to a remote control device for data interaction with the control device.
[0011] In the above solution, optionally, the dual-channel analog-to-digital converter circuit includes an intermediate-frequency filtering unit, an operational amplifier unit, a level conversion unit, and an analog-to-digital converter; the intermediate-frequency filtering unit is used to filter the voltage signal after mixing, and the operational amplifier unit is used to amplify the voltage signal filtered by the intermediate-frequency filtering unit; the level conversion unit is used to convert the amplified voltage signal for matching the analog-to-digital converter; the analog-to-digital converter is used to perform analog-to-digital conversion on the voltage to obtain a digital voltage signal.
[0012] In the above solution, optionally, the MCU interface circuit includes a clock interface circuit and a communication interface circuit.
[0013] In the above solution, optionally, the MCU interface circuit adopts the STM32L433RC model.
[0014] In the above solution, optionally, the circuit further includes a power supply module, and the power supply module is respectively connected to the preamplification circuit, the reference frequency generation circuit, the mixing circuit, the dual-channel analog-to-digital converter circuit, and the MCU interface circuit.
[0015] This application has at least the following beneficial effects:
[0016] This application preliminarily amplifies and processes the original voltage signal through a preamplifier circuit, reducing the intensity requirement of subsequent circuits for signal processing. This enables the subsequent signal processing process to not require excessive operations and processing by a digital signal processor, thereby reducing power consumption. The mixer circuit mixes the input signal with the stable reference frequency signal generated by the reference frequency generation circuit to resolve the required intermediate frequency signal. This mixing processing method can achieve signal frequency conversion and screening with lower power consumption, avoiding complex frequency transformation operations by a digital signal processor. The dual-channel analog-to-digital converter circuit performs analog-to-digital conversion on the processed mixed voltage signal to obtain a digital voltage signal. This process is relatively efficient, has low power consumption, and can directly convert the analog signal into a digital signal, reducing the workload of the digital signal processor in analog-to-digital conversion. The MCU interface circuit processes the digital voltage signal to obtain the phase and amplitude information of the resistivity after being transmitted through the formation and attenuated. The MCU usually has low power consumption and high processing efficiency, which can greatly reduce power consumption while meeting the signal processing requirements. Thus, by first using the preamplifier circuit to preliminarily amplify and process the original voltage signal, then mixing the input signal with the stable reference frequency signal generated by the reference frequency generation circuit through the mixer circuit, and then processing through the dual-channel analog-to-digital converter circuit and the MCU interface circuit, it is possible to reduce the power consumption of analog devices during operation, while reducing the workload of the MCU interface circuit, resulting in reduced power consumption and overall greatly reducing power consumption. At the same time, in this application's preamplifier circuit, only necessary amplifiers and filters are used, avoiding the accumulation of excessive analog devices, simplifying the circuit design in terms of design, and thus reducing the power consumption accumulation. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 FIG. is a schematic diagram of a dual-frequency signal processing circuit of an oil formation resistivity measurement instrument provided by an embodiment of this application. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0018] In order to make the objectives, technical solutions, and advantages of this application clearer, the following further elaborates on this application in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining this application and are not used to limit this application.
[0019] In one embodiment, as Figure 1 shown, a dual-frequency signal processing circuit of an oil formation resistivity measurement instrument is provided. The circuit includes: a preamplifier circuit, a reference frequency generation circuit, a mixer circuit, a dual-channel analog-to-digital converter circuit, and an MCU interface circuit;
[0020] The pre-amplification circuit and the reference frequency generation circuit are respectively connected to the mixing circuit; the pre-amplification circuit is used to amplify and process the original voltage signal of the resistivity measuring instrument for oil formation; the reference frequency generation circuit is used to generate a reference frequency signal;
[0021] The mixing circuit is connected to the dual-channel analog-to-digital converter circuit; the mixing circuit is used to process the original mixed-frequency signal for obtaining formation resistivity and parse out the required intermediate-frequency signal; the dual-channel analog-to-digital converter circuit is used to perform analog-to-digital conversion on the voltage signal processed by the mixing circuit to obtain a digital voltage signal;
[0022] The dual-channel analog-to-digital converter circuit is connected to the MCU interface circuit; the MCU interface circuit is used to process the digital voltage signal to obtain the phase and amplitude information of the resistivity after being transmitted through the formation and attenuated.
[0023] Specifically, the dual-frequency signal processing circuit amplifies and processes the initial voltage signal through the pre-amplification circuit, generates a reference frequency signal through the reference frequency generation circuit, and inputs the amplified original voltage signal and the reference frequency signal into the mixing circuit. Thus, since the voltage signal has been amplified before mixing, the mixing circuit does not need to be designed too complex to process very weak signals; at the same time, the reference frequency generation circuit provides a stable frequency reference, which improves the frequency stability and accuracy of the mixed-frequency signal. Finally, it is connected to the MCU interface circuit through the dual-channel analog-to-digital converter circuit for analog-to-digital conversion and signal processing. During this process, the workload of the MCU interface circuit can be reduced, thereby reducing power consumption and simplifying the circuit.
[0024] In the dual-frequency signal processing circuit of the above-mentioned oil formation resistivity measurement instrument, the preamplifier circuit preliminarily amplifies and processes the original voltage signal, reducing the intensity requirement of the subsequent circuit for signal processing. This enables the subsequent signal processing process to not require excessive operations and processing by the digital signal processor, thereby reducing power consumption. The mixing circuit mixes the input signal with the stable reference frequency signal generated by the reference frequency generation circuit to resolve the required intermediate frequency signal. This mixing processing method can achieve signal frequency conversion and screening with lower power consumption, avoiding complex frequency transformation operations by the digital signal processor. The dual-channel analog-to-digital converter circuit performs analog-to-digital conversion on the processed mixed-frequency voltage signal to obtain a digital voltage signal. This process is relatively efficient, has low power consumption, and can directly convert the analog signal into a digital signal, reducing the workload of the digital signal processor in analog-to-digital conversion. The MCU interface circuit processes the digital voltage signal to obtain the phase and amplitude information of the resistivity after attenuation through the formation. The MCU usually has low power consumption and high processing efficiency, which can greatly reduce power consumption while meeting the signal processing requirements. Thus, by first using the preamplifier circuit to preliminarily amplify and process the original voltage signal, then using the mixing circuit to mix the input signal with the stable reference frequency signal generated by the reference frequency generation circuit, and then processing through the dual-channel analog-to-digital converter circuit and the MCU interface circuit, it is possible to reduce the power consumption of the analog devices during operation, and at the same time reduce the workload of the MCU interface circuit, resulting in reduced power consumption and overall greatly reducing power consumption. At the same time, in this application, only necessary amplifiers and filters are used in the preamplifier circuit, avoiding the accumulation of excessive analog devices, simplifying the circuit design in terms of design, and thus reducing the cumulative power consumption.
[0025] In one embodiment, the reference frequency generation circuit generates reference frequency signals of 395KHz and 1.995MHz.
[0026] In one embodiment, the MCU interface circuit is further provided with a bus interface, and the bus interface is connected to a remote control device for data interaction with the control device.
[0027] In one embodiment, the dual-channel analog-to-digital converter circuit includes an intermediate frequency filtering unit, an operational amplifier unit, a level conversion unit, and an analog-to-digital converter; the intermediate frequency filtering unit is used for filtering the mixed-frequency voltage signal, the operational amplifier unit is used for amplifying the voltage signal filtered by the intermediate frequency filtering unit; the level conversion unit is used for converting the amplified voltage signal for matching the analog-to-digital converter; the analog-to-digital converter is used for performing analog-to-digital conversion on the voltage to obtain a digital voltage signal.
[0028] In one embodiment, the MCU interface circuit includes a clock interface circuit and a communication interface circuit.
[0029] In one embodiment, the MCU interface circuit adopts the STM32L433RC model.
[0030] In one embodiment, the circuit further includes a power supply module, and the power supply module is respectively connected to the preamplifier circuit, the reference frequency generation circuit, the mixing circuit, the dual-channel analog-to-digital converter circuit, and the MCU interface circuit.
[0031] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.
[0032] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.
Claims
1. A dual-frequency signal processing circuit for an oil formation resistivity measurement instrument, characterized in that, The circuit includes: a preamplifier circuit, a reference frequency generation circuit, a mixer circuit, a dual-channel analog-to-digital converter circuit, and an MCU interface circuit; The preamplifier circuit and the reference frequency generation circuit are respectively connected to the mixer circuit; the preamplifier circuit is used to amplify and process the original voltage signal of the petroleum formation resistivity measuring instrument obtained; the reference frequency generation circuit is used to generate a reference frequency signal; The mixer circuit is connected to the dual-channel analog-to-digital converter circuit; the mixer circuit is used to process the original mixed-frequency signal for obtaining the formation resistivity and resolve the required intermediate-frequency signal; the dual-channel analog-to-digital converter circuit is used to perform analog-to-digital conversion on the voltage signal processed by the mixer circuit to obtain a digital voltage signal; The dual-channel analog-to-digital converter circuit is connected to the MCU interface circuit; the MCU interface circuit is used to process the digital voltage signal to obtain the phase and amplitude information of the resistivity after being transmitted through the formation and attenuated.
2. The dual-frequency signal processing circuit of the resistivity measuring instrument for oil formations according to claim 1, wherein, The reference frequency generation circuit generates reference frequency signals of 395 KHz and 1.995 MHz.
3. The dual-frequency signal processing circuit of the resistivity measuring instrument for oil formations according to claim 1, characterized in that, The MCU interface circuit is further provided with a bus interface, and the bus interface is connected to a remote control device for data interaction with the control device.
4. The dual-frequency signal processing circuit of the resistivity measuring instrument for oil formation according to claim 1, characterized in that, The dual-channel analog-to-digital converter circuit includes an intermediate-frequency filtering unit, an operational amplifier unit, a level conversion unit, and an analog-to-digital converter; the intermediate-frequency filtering unit is used to filter the mixed voltage signal; the operational amplifier unit is used to amplify the voltage signal filtered by the intermediate-frequency filtering unit; the level conversion unit is used to convert the amplified voltage signal for matching the analog-to-digital converter; The analog-to-digital converter is used to perform analog-to-digital conversion on the voltage to obtain a digital voltage signal.
5. The dual-frequency signal processing circuit of the resistivity measuring instrument for oil formation according to claim 1, characterized in that, The MCU interface circuit includes a clock interface circuit and a communication interface circuit.
6. The dual-frequency signal processing circuit of the resistivity measuring instrument for oil formation according to claim 5, characterized in that The MCU interface circuit adopts the STM32L433RC model.
7. The dual-frequency signal processing circuit of the petroleum formation resistivity measurement instrument according to claim 1, characterized in that, The circuit further includes a power supply module, and the power supply module is respectively connected to the preamplifier circuit, the reference frequency generation circuit, the mixer circuit, the dual-channel analog-to-digital converter circuit, and the MCU interface circuit.