EM-MWD井下信号发射系统  

EM⁃MWD downhole signal transmission system

作　　者：胡越发[1] 陈晓晖[1] 杨春国[1] HU Yue⁃fa;CHEN Xiao⁃hui;YANG Chun⁃guo(Sinopec Research Institute of Petroleum Engineering,Beijing 100101,China)

机构地区：[1]中国石化石油工程技术研究院,北京100101

出　　处：《电子设计工程》2020年第10期175-179,共5页Electronic Design Engineering

摘　　要：随钻测量技术可实现井下工程参数和地质参数的实时获取及传输,广泛应用于钻井工程。电磁随钻测量技术由于传输速率高,无需开泵即可传输信息,相对于MWD有着难以比拟的技术优势。开展了井下无线信道传输特性的研究,设计了井下发射天线结构,确定了电磁信号调制方式,根据不同工况定义了特定的传输信号数据帧,并通过集成ADXL203和设计算法,实现了对井下泵状态的判别,用于测斜及钻进等工况下不同信号帧的发射。实验表明,设计的EM-MWD井下信号发射系统可调制出正弦电磁波信号,并可准确判别井下泵状态并可按照设定发射不同信号帧,在特有的技术优势的基础上,提高了电磁随钻测量仪器的工作效率,进一步降低了功耗及使用成本。The MWD technology can acquire and transmit downhole engineering parameters and geological parameters in real time,and is widely used in drilling engineering.The EM⁃MWD technology has a high transmission rate and transmits information without having to open the pump,which has incomparable technical advantages over MWD.We carried out research on the transmission characteristics of the downhole channel,designed the structure of the transmitting antenna,determined the modulation mode of the electromagnetic signal,defined the specific transmission signal data frame according to different working conditions,and could determine the state of downhole pump for transmission of different signal frames by integrating the ADXL203 and the designed algorithm.Experiments showed that the designed EM⁃MWD signal transmission system could modulate the sinusoidal electromagnetic wave signal and accurately determine the downhole pump state to transmit different signal frames.Based on the unique technical advantages,the system improved the working efficiency and further reduced power consumption and operating costs.

关 键 词：EM-MWD 信号发射系统 泵状态 数据帧 

分 类 号：TN929.4[电子电信—通信与信息系统]