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随钻声波测井仪要在井下高温强震的环境下连续工作超过200h,仪器电路的性能稳定,结构简单是设计时要考虑的重点。本文提出一种随钻声波测井仪控制和数据存储系统方案。该系统以FPGA为核心,控制声波发射接收时序,利用其内部自带的RAM设计16位的FIFO进行快速数据处理及存储,根据需要选取工作模式,同时采用NANDFLASH作为随钻声波测井仪的数据内存。整个设计结构简单,稳定性好,存储量大,功耗低,便于开发和厚膜化,适用于随钻声波测井仪。
The acoustic logging tool should work continuously for more than 200h in the condition of high temperature and strong earthquake in the well. The performance of the instrument is stable and the structure is simple. This paper presents a LWS control and data storage system solution. The system uses FPGA as the core to control the timing of acoustic emission and reception. The system uses its own internal RAM to design a 16-bit FIFO for fast data processing and storage. Working mode is selected according to the needs. NANDFLASH is used as the data of the LWD acoustic logging tool RAM. The entire design structure is simple, good stability, large storage capacity, low power consumption, ease of development and thick film, suitable for LWD acoustic logging tools.