MWD就是随钻测量的简称。MWD系统可以在钻井过程中进行井下测量而不需起下钻。最近,由伊斯门公司研制出的无导线测量工具就是一种MWD系统。它是借用了成熟的部件装配而成,是在有线测量的基础上发展起来的。它与有线系统的区别在于信号的传输不是经过导线,而是借助于泥浆流中的脉冲。 MWD is the abbreviation of measurement while drilling. The MWD system can make downhole measurements during drilling without undercutting. Recently, the wire-free measuring tool developed by Eastman is an MWD system. It is borrowed from the assembly of mature components, is based on the wired measurement developed. It differs from wired systems in that the signal is transmitted not by wires but by means of pulses in the mud stream.