Well logging bus characteristic testing device, method and system based on electronic load

Abstract

The invention discloses a logging bus characteristic testing device, method and system based on an electronic load, the electronic load is applied to logging bus performance testing, the electronic load is used for simulating logging bus node load characteristics for logging bus testing, and the electronic load is connected to each node for testing port level. Meanwhile, the electronic load can also simulate a terminating resistor, a matrix test structure is established for multiple nodes of the logging bus, the problem that in the prior art, underground bus characteristics cannot be tested and verified indoors is solved, characteristic verification can be conducted on various buses, reference and guiding effects can be achieved on formulating of bus standards, and the method is suitable for popularization and application. And the use value is very high.

Description

Technical Field

[0001] The invention belongs to the field of well logging downhole bus transmission, and in particular relates to a well logging bus characteristic testing device, method and system based on an electronic load. Background Art

[0002] Geophysical logging (referred to as logging) is an important technology in the process of oil production. It is an applied technical discipline that uses geophysical methods to measure various physical information of rock formations in wells, study drilling geological profiles of oil and gas fields, coal fields, etc., and solve certain underground geological, production and drilling technical problems. The specific technical implementation process is to measure the geophysical parameters of rock formations such as conductivity, acoustic properties, radioactivity, and electrochemical properties along the drilling profile through special downhole instruments.

[0003] The logging system is mainly used to measure and analyze various physical characteristics of underground formations. It is a data-centric control system that uses certain transmission media to realize logging information collection, transmission, processing and quality control. It is the material carrier of all logging information application technologies, including system hardware and system software. Among them, high-speed and high-reliability data transmission between underground instruments and ground systems is a key technology that needs to be broken through in the application of logging systems, which puts forward higher requirements for the underground instrument bus.

[0004] Therefore, it is currently necessary to solve the problem that the existing technology cannot test and verify the characteristics of the underground bus indoors. Summary of the invention

[0005] The purpose of the present invention is to overcome the problem that the prior art cannot test and verify the downhole bus characteristics indoors, and provides a logging bus characteristics testing device, method and system based on electronic load. The electronic load is connected to each node to test the port level. At the same time, the electronic load can also simulate the termination resistance. An active differential probe is added between the logging bus and the oscilloscope. The influence of the ground wire on the logging bus is reduced through isolation, thereby ensuring the accuracy of the test results. The system can also be used to formulate logging bus standards.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme:

[0007] A logging bus characteristic test device based on an electronic load comprises a host computer and a GPIB bus; the host computer is connected to a test device via the GPIB bus; the test device comprises an oscilloscope, an electronic load and a signal generator; the output end of the signal generator is connected to the logging bus; a plurality of detection nodes are arranged on the logging bus; the ports to be tested of the detection nodes are connected to the electronic load; the end or the middle of the logging bus is connected to the oscilloscope; an active differential probe is arranged between the logging bus and the oscilloscope; and the host computer is installed with host computer test software.

[0008] Furthermore, the electronic load adopts a trigger input and supports a parallel configuration to implement synchronous measurement.

[0009] Furthermore, the electronic load has a built-in pulse generator for continuous operation, pulse operation and triggered transient operation.

[0010] Furthermore, the test functions of the electronic load include measuring voltage, current, power, voltage peak value, voltage average value, voltage minimum value and voltage maximum value.

[0011] Furthermore, the input reading of the electronic load is displayed through the front panel of the electronic load, and the measurement reading of the electronic load is displayed through the host computer test software.

[0012] Furthermore, the electronic load operates in an independent channel.

[0013] Furthermore, the host computer is a computer or a single-chip microcomputer.

[0014] A method for testing the characteristics of a well logging bus based on an electronic load, using the well logging bus characteristics testing device based on an electronic load as described above, comprises the following steps:

[0015] Step 1: Complete the construction of the test device; connect the host computer to the signal generator, electronic load and oscilloscope through the GPIB bus, connect the signal generator to the logging bus, connect the oscilloscope at the end or in the middle of the logging bus, and set an active differential probe between the logging bus and the oscilloscope; the host computer is used to provide an operation interaction interface and display feedback data, the oscilloscope is used to observe the waveform generated by the test, and listen to and test the test results of the logging bus;

[0016] Step 2: Send the test command to all test equipment through the host computer, and set the waveform of different frequency and amplitude as the signal source to add excitation to the logging bus;

[0017] Step 3: Connect the electronic load to the port to be tested of the logging bus, and collect signals through an oscilloscope; use the electronic load to simulate the load characteristics of the logging bus node to test the logging bus, establish a matrix test structure for multiple nodes of the logging bus, and use the electronic load to measure the port level according to the different characteristics of the differential level and common mode level of different types of logging bus terminals to verify the performance indicators of the logging bus, and use this as the basis for the design standard of the logging bus;

[0018] Step 4: According to the logging bus indicators preset in the host computer test software, determine whether the test results reach the set values. If they reach the set values, output the test results and the corresponding eye diagrams. If they do not reach the indicators, continue to readjust the parameters for testing. If the number of tests reaches the upper limit, directly output the test results and the corresponding eye diagrams.

[0019] Furthermore, the electronic load simulates the port impedance and measures the terminal level value at the same time, and obtains an eye diagram in the host computer test software according to the measurement result to reflect the logging bus characteristics, and finally generates a logging bus characteristic test report according to the test result.

[0020] A well logging bus characteristic test system based on an electronic load comprises a test device building module: used to complete the building of the test device; connect a host computer with a signal generator, an electronic load and an oscilloscope through a GPIB bus, connect the signal generator with the well logging bus, connect an oscilloscope at the end or in the middle of the well logging bus, and set an active differential probe between the well logging bus and the oscilloscope; the host computer is used to provide an operation interaction interface and display feedback data, and the oscilloscope is used to observe the waveform generated by the test, and monitor and test the test results of the well logging bus;

[0021] Command sending module: used to send test commands to all test equipment through the host computer. The signal generator sets waveforms of different frequencies and amplitudes as signal sources to add excitation to the logging bus.

[0022] Performance index verification module: used to connect the electronic load to the port to be tested of the logging bus, and collect signals through an oscilloscope; use the electronic load to simulate the load characteristics of the logging bus node to perform bus testing, establish a matrix test structure for multiple nodes of the logging bus, and verify the performance indicators of the logging bus through the measurement port level of the electronic load according to the different characteristics of the differential level and common mode level of different types of logging bus terminals, and use it as the basis for the design standard of the logging bus;

[0023] Logging bus index judgment module: It is used to judge whether the test result reaches the set value according to the logging bus index preset in the host computer test software. If it reaches the set value, the test result and the corresponding eye diagram are output. If it does not reach the index, the parameters are readjusted for testing. If the number of tests reaches the upper limit, the test result and the corresponding eye diagram are directly output.

[0024] Compared with the prior art, the present invention has the following beneficial technical effects:

[0025] The electronic load-based logging bus characteristic testing device provided by the present invention applies the electronic load to the logging bus performance test, uses the electronic load to simulate the logging bus node load characteristics to perform the logging bus test, connects the electronic load at each node to test the port level, and the electronic load can also simulate the termination resistance, thereby overcoming the problem that the prior art cannot test and verify the downhole bus characteristics indoors.

[0026] The invention adds an active differential probe between the well logging bus and the oscilloscope to eliminate the interference of the ground wire on the well logging bus, thereby ensuring the accuracy of the test result.

[0027] The signal generator of the present invention provides frequency, waveform and output level electrical signals, which is convenient for subsequent electronic load to test the characteristics of the well logging bus.

[0028] The electronic load-based logging bus characteristic testing method provided by the present invention applies the electronic load to the logging bus performance test. According to the characteristic that the differential level and common mode level of the logging bus terminal affect the performance indicators such as the power consumption, transmission distance and anti-interference of the logging bus, the method performs real-time logging bus port impedance simulation and level measurement through the electronic load, effectively solving the problem that the prior art cannot perform indoor testing on the downhole bus, and providing guidance for the formulation of downhole bus standards.

[0029] The present invention provides a logging bus characteristic test system based on an electronic load. The electronic load simulates the load characteristics of the logging bus node, a signal source adds excitation, and an oscilloscope observes the logging bus signal form. The present invention can verify the characteristics of various buses and can serve as a reference and guide for the formulation of bus standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings in the specification are used to provide further understanding of the present invention and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0031] Figure 1 The figure is a schematic diagram of the well logging bus design system based on electronic load of the present invention.

[0032] Figure 2 The following is a working flow chart of the well logging bus characteristic test system based on electronic load of the present invention. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with the accompanying drawings:

[0034] See also Figure 1A logging bus characteristic test device based on electronic load includes a host computer, a network cable, a GPIB bus, a signal generator, an electronic load, a logging bus, and an oscilloscope. The logging bus can be provided with multiple detection nodes, and an electronic load is provided between each test node to simulate the logging bus node load and measure the characteristics of the logging bus.

[0035] The host computer refers to a computer or single-chip microcomputer that can directly send operation instructions. It generally provides a user operation interactive interface and displays feedback data to the user. Here it is a PC.

[0036] The GPIB bus is a general purpose interface bus that connects devices to computers and is used to connect a host computer to test equipment such as signal generators, electronic loads, and oscilloscopes.

[0037] The signal generator is used to provide electrical signals of various frequencies, waveforms and output levels, so that the subsequent electronic load can monitor and test the characteristics of the logging bus.

[0038] The oscilloscope is used to observe the waveform generated by the test and characterize the test results of the logging bus.

[0039] See also Figure 2 , a logging bus characteristic testing method based on electronic load, comprising the following steps:

[0040] Step 1: Complete the construction of the test device; first select a computer as the host computer, and connect the signal generator, electronic load, oscilloscope and other equipment through GPIB or network cable. The signal generator is connected to the logging bus, and the electronic load is connected to the port to be tested on the logging bus. There is no requirement for the number of electronic load connections, and multiple nodes can be tested. An active differential probe is added between the logging bus and the oscilloscope to isolate the interference of the ground wire on the logging bus to ensure the accuracy of the test results. The oscilloscope is connected at the end or in the middle of the logging bus.

[0041] Step 2: The host computer sends a test command to all test equipment. The signal generator sets waveforms of different frequencies and amplitudes according to requirements and applies them to the logging bus as a signal source to add excitation.

[0042] Step 3: Connect the electronic load to the port to be tested and collect signals through an oscilloscope. Since the bus hardware transmission medium is essentially a pair of differential signals, the difference is that the terminal differential level and common mode level of different types of buses are different. The greater the voltage difference, the greater the power consumption, the longer the transmission distance, and the better the anti-interference performance. According to the above bus characteristics, the port level is measured by an electronic load to verify the performance indicators of the bus, and this is used as the basis for designing the bus standard.

[0043] Step 4: According to the logging bus index set in the host computer test software, determine whether the test result reaches the set value. If it reaches the set value, output the test result and the corresponding eye diagram. If it does not reach the index, continue to readjust the parameters for testing. If the number of tests reaches the upper limit, directly output the test result and the corresponding eye diagram.

[0044] The electronic load has the following functions: (1) It has multiple measurement functions and can measure voltage, current, power, voltage peak, voltage average, voltage minimum and voltage maximum. (2) Input readings and measurement readings can be displayed through the front panel and the host computer software. (3) Independent channel operation. (4) Built-in pulse generator for continuous operation, pulse operation and triggered transient operation. (5) Trigger input supports parallel configuration for synchronous measurement. It is used to simulate and measure the characteristics between any set of nodes on the logging bus.

[0045] The electronic load-based logging bus test system is not only applicable to a single type of logging bus, but also to many other types of buses. The greatest feature of the present invention is that it uses an electronic load to simulate the load characteristics of the bus node for bus testing, and establishes a matrix test structure for multiple nodes of the bus. This solution can help indoor bus performance testing and the formulation of future bus standards.

[0046] The present invention is further described below in conjunction with embodiments:

[0047] Take the coaxial Ethernet bus as an example. The characteristic impedance of the bus is 50Ω, and the outer diameter of the cable has two specifications: 3.3mm and 2.48mm. A 50Ω three-way connection is required at the node. To test the characteristics of the bus, first select a computer as the host computer, and connect the signal generator, electronic load, oscilloscope and other electronic equipment through the GPIB bus. The signal generator is connected to the logging bus, and the electronic load is connected to the port to be tested on the logging bus. There is no requirement for the number of electronic load connections. The test can be performed on multiple nodes, and the oscilloscope is connected at the end or middle of the logging bus. The host computer sends a test command, and the signal generator sets waveforms of different frequencies and amplitudes according to the requirements to act on the logging bus. The electronic load is connected to the port to be tested. The electronic load can simulate the port impedance and measure the terminal level value. Therefore, the eye diagram can be obtained in the host computer test software according to the measurement results to reflect the bus characteristics, and finally a bus characteristic test report can be generated according to the test results.

[0048] 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 its protection scope. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that after reading the present invention, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the invention, but these changes, modifications or equivalent substitutions are all within the protection scope of the pending claims of the invention.

Claims

1. A logging bus characteristic test device based on electronic load, characterized in that: The invention comprises a host computer and a GPIB bus; the host computer is connected to a test device via the GPIB bus; the test device comprises an oscilloscope, an electronic load and a signal generator; the output end of the signal generator is connected to a logging bus; a plurality of detection nodes are arranged on the logging bus; the ports to be tested of the detection nodes are connected to the electronic load; the end or the middle of the logging bus is connected to the oscilloscope; an active differential probe is arranged between the logging bus and the oscilloscope; and the host computer is installed with host computer test software.

2. The logging bus characteristic test device based on electronic load according to claim 1, characterized in that: The electronic load features a trigger input that supports parallel configuration for synchronous measurements.

3. The logging bus characteristic test device based on electronic load according to claim 1, characterized in that: The electronic load has a built-in pulse generator for continuous operation, pulse operation and triggered transient operation.

4. The logging bus characteristic test device based on electronic load according to claim 1, characterized in that: The test functions of the electronic load include measuring voltage, current, power, voltage peak value, voltage average value, voltage minimum value and voltage maximum value.

5. The logging bus characteristic test device based on electronic load according to claim 1, characterized in that: The input reading of the electronic load is displayed through the front panel of the electronic load, and the measurement reading of the electronic load is displayed through the host computer test software.

6. The logging bus characteristic test device based on electronic load according to claim 1, characterized in that: The electronic load operates in an independent channel.

7. The logging bus characteristic test device based on electronic load according to claim 1, characterized in that: The host computer is a computer or a single chip microcomputer.

8. A method for testing the characteristics of a well logging bus based on an electronic load, characterized in that: The well logging bus characteristic testing device based on electronic load as described in any one of claims 1 to 7 comprises the following steps: Step 1: Complete the construction of the test device; connect the host computer to the signal generator, electronic load and oscilloscope through the GPIB bus, connect the signal generator to the logging bus, connect the oscilloscope at the end or in the middle of the logging bus, and set an active differential probe between the logging bus and the oscilloscope; the host computer is used to provide an operation interaction interface and display feedback data, the oscilloscope is used to observe the waveform generated by the test, and listen to and test the test results of the logging bus; Step 2: Send the test command to all test equipment through the host computer, and set the waveform of different frequency and amplitude as the signal source to add excitation to the logging bus; Step 3: Connect the electronic load to the port to be tested of the logging bus, and collect signals through an oscilloscope; use the electronic load to simulate the load characteristics of the logging bus node to test the logging bus, establish a matrix test structure for multiple nodes of the logging bus, and use the electronic load to measure the port level according to the different characteristics of the differential level and common mode level of different types of logging bus terminals to verify the performance indicators of the logging bus, and use this as the basis for the design standard of the logging bus; Step 4: According to the logging bus indicators preset in the host computer test software, determine whether the test results reach the set values. If they reach the set values, output the test results and the corresponding eye diagrams. If they do not reach the indicators, continue to readjust the parameters for testing. If the number of tests reaches the upper limit, directly output the test results and the corresponding eye diagrams.

9. The method for testing the characteristics of a well logging bus based on an electronic load according to claim 8, characterized in that: The electronic load simulates the port impedance and measures the terminal level value at the same time. According to the measurement result, an eye diagram is obtained in the host computer test software to reflect the logging bus characteristics. Finally, a logging bus characteristic test report is generated according to the test result.

10. A well logging bus characteristic test system based on electronic load, characterized in that: It includes a test device building module: used to complete the building of the test device; connect the host computer with the signal generator, electronic load and oscilloscope through the GPIB bus, connect the signal generator with the logging bus, connect the oscilloscope at the end or in the middle of the logging bus, and set an active differential probe between the logging bus and the oscilloscope; the host computer is used to provide an operation interaction interface and display feedback data, the oscilloscope is used to observe the waveform generated by the test, and listen to and test the test results of the logging bus; Command sending module: used to send test commands to all test equipment through the host computer. The signal generator sets waveforms of different frequencies and amplitudes as signal sources to add excitation to the logging bus. Performance index verification module: used to connect the electronic load to the port to be tested of the logging bus, and collect signals through an oscilloscope; use the electronic load to simulate the load characteristics of the logging bus node to perform bus testing, establish a matrix test structure for multiple nodes of the logging bus, and verify the performance indicators of the logging bus through the measurement port level of the electronic load according to the different characteristics of the differential level and common mode level of different types of logging bus terminals, and use it as the basis for the design standard of the logging bus; Logging bus index judgment module: It is used to judge whether the test result reaches the set value according to the logging bus index preset in the host computer test software. If it reaches the set value, the test result and the corresponding eye diagram are output. If it does not reach the index, the parameters are readjusted for testing. If the number of tests reaches the upper limit, the test result and the corresponding eye diagram are directly output.

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