A high-speed transmission device for 3D acoustic logging data based on LVDS technology

Abstract

The invention discloses a three-dimensional acoustic logging data high-speed transmission device based on LVDS technology. Firstly, the ground control system issues a control command, the adapter board receives the command through the LAN port, and transmits the command through the Mcbsp interface, that is, the multi-channel buffer serial port. to the control board, and then use LVDS interface technology to realize high-speed serial transmission of control commands and 3D logging acoustic data. LVDS communication interface technology uses extremely low voltage swing to transmit data in a high-speed differential manner. It has low noise, good common-mode rejection capability, low power consumption and the circuit can be integrated into the system-level IC, thus overcoming the three-dimensional The transmission distance of acoustic logging data is long, the working environment of downhole circuits is complex, and the 3D acoustic logging signal is easily disturbed by the outside world. The high-speed data transmission between the control board and the acquisition board can be completed accurately in real time.

Description

technical field [0001] The invention belongs to the technical field of high-speed transmission of well logging signals, and more specifically relates to a high-speed transmission device for three-dimensional acoustic logging data based on LVDS (Low-Voltage Differential Signaling) technology, which is suitable for working in high-temperature and harsh environments underground. High-speed transmission of data between the control board and the acquisition board during the acoustic logging process. Background technique [0002] 3D acoustic logging is a new generation of acoustic logging technology developed on the basis of cross-dipole acoustic logging technology. Comprehensive measurement of the waveforms of various frequency bands to obtain the three-dimensional acoustic wave characteristics of the formation, that is, the changes of compressional wave time difference, shear wave and Stoneley wave in the axial, radial and circumferential directions of the wellbore, and provide ...

AI Technical Summary

Problems solved by technology

[0003] Traditional acoustic logging only measures acoustic signals in specific frequency bands, and the amount of measured data is small, so the low-speed transmission method can meet the requirements for data transmission speed

However, the amount of data measured by 3D acoustic logging is very large, and it is difficult to meet the requirements of real-time measurement by using low-speed transmission.

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