井下电磁传输发射装置设计研究

摘要

为了合理的开采地下油气资源,往往需要准确完整的获得井下待测地层压力和温度的数据,从而去评价其经济价值和确定增产措施.本文通过建立电磁传输地面模拟测试平台,分析了井下电磁传输系统的可行性及其信号幅频特性,采用电磁感应传输原理,设计出基于单片机的数据采集系统和基于DDS的信号发射装置,将数字信号调制为450 kHz和600 kHz的正弦波2FSK信号,其码元传输速率可达9 600 Bd.通过对地面模拟测试平台信号幅频特性的测试,分析了井下电磁传输系统的规律特性,介绍了针对井下电磁无线传输设计的数据采集和信号发射装置.%To exploit the down-hole oil and gas resource reasonably,and to evaluate its economic value and determine the stimulation,measurement signals need to be transmitted from the bottom to the ground in real time,such as temperature and pressure.This paper analysis the feasibility of down hole electromagnetic transmission system and signal amplitude frequency characteristics through the electromagnetic transmission ground simulation test platform,and designs a data acquisition system based on MCU and DDS based signal transmitting device using electromagnetic induction transmission principle,digital signal modulation is 450 kHz and 600 kHz sine wave of 2FSK signal,the symbol transmission rate up to 9 600 Bd.