Abstract：

In order to increase the accuracy of well logging interpretation, the acoustic logging tool array sonde is becoming more complex. The complexity of logging tools not only improves the requirement of stability, but also increases the difficulty of acoustic logging tool array sonde assembling and debugging. In order to solve the problem of long times and low precision debugging for an array acoustic sonde, and to verify the effectiveness and consistent performance of the sonde, a new embedded array sonde test system based on a field-programmable gate array (FPGA) was designed and implemented. In the experiment, the    amplitude and frequency adjustment range of the test system acoustic transmitting device was tested by the standard receiving transducer, and the consistency of the test system acoustic receiving device was verified by the standard transmitting transducer. The test system was applied to a test of the actual acoustic sonde. Through the comparison and analysis of the theoretical simulation and the actual measurement data, it was found that the test system can detect the effectiveness and consistency of each channel of the acoustic receiving sonde, and evaluate the performance of the monopole and dipole of the transmitting acoustic sonde separately. At the same time, the test system can calibrate the transducer array, which can be used as a reference for data processing in actual well logging. This system mainly includes the following two parts, the first part is the master-slave system architecture based on an embedded uClinux system and network interconnection, with the chip based on ARM technology as the hardware core. The upper computer communicates with the embedded front terminal through the Ethernet interface, realizes the functions of sending control commands and receiving data, and completes the tasks of data processing, graphic display, storage, etc. The embedded front terminal connects with the circuit board of the test system through the extended I/O bus to complete the control, data acquisition, network interconnection and other debugging functions. The second part is the acoustic transmitting device and acoustic receiving device with a data processing module, which is based on a FPGA. The acoustic transmitting device is composed of a loudspeaker, waveform generating circuit, digital-analog conversion circuit, filtering circuit and program-controlled amplifying circuit. The sound wave receiving device is composed of a sound pickup device, filtering circuit, program-controlled amplifier circuit and analog-digital conversion circuit. The system can be effectively used in the performance assessment of an array acoustic sonde and transducer array calibrating, which contributes to improving the assembly and maintenance. efficiency of the acoustic logging tool.    

Key words：acoustic logging; array sonde; testing technology; FPGA; embedded

Received： 2020-05-13

Corresponding Authors： teamo_0911@sina.com

Cite this article：LIU Dong, JU Xiaodong, LU Junqiang, MEN Baiyong. Embedded-technology-based acoustic logging array sonde testing system. Petroleum Science Bulletin, 2020, 03: 337-348.

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