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1. 发明申请

US20090003133A1 Acoustic Telemetry 审中-公开
标题翻译：声学遥测
公开(公告)号：US20090003133A1
公开(公告)日：2009-01-01
申请号：US12279089
申请日：2007-03-20
申请人： Roger Patrick Dalton , Ian Andrew Jamieson , Matthew Waters
发明人： Roger Patrick Dalton , Ian Andrew Jamieson , Matthew Waters
IPC分类号： E21B47/16 , B06B1/00
CPC分类号： E21B47/16
摘要： A method of transmitting data acoustically through a tubular structure, such as a drill string or production tubing in an oil or gas well, predominantly comprising a series of tubing sections (1)joined end to end by couplings (2), at least a preponderance of the tubing sections having an axial length of at least a dimension X between couplings and at least a preponderance of the couplings having an axial length of no more than a dimension x, where X is substantially greater than x. The method comprises propagating acoustic signals along the structure, between transducers (9,10) over a distance N of at least 10X, in the form of tone bursts at least predominantly comprising a selected guided wave mode (preferably the L(0, 1) mode at low frequency) with a wavelength of at least 2x, and each burst having a temporal length of substantially less than 2N/C and preferably no more than 2X/C, where C is the phase velocity of the selected mode. In this way interference problems associated with Brillouin scattering in such structures can be overcome without excessive power consumption.
摘要翻译：一种通过管状结构传输数据的方法，例如在油井或气井中的钻柱或生产管道，主要包括由联轴器（2）端到端连接的一系列管段（1），至少一个优势管段的轴向长度至少为联轴器之间的尺寸X，并且至少具有轴向长度不大于尺寸x的连接件的优势，其中X基本上大于x。该方法包括以至少主要包括选定的导波模式（优选L（0,1））的音调脉冲串的形式沿着结构传播在至少10X的距离N之间的换能器（9,10）之间的声信号，具有至少2x的波长的低频模式，并且每个脉冲串的时间长度基本上小于2N / C，优选不大于2X / C，其中C是所选模式的相速度。以这种方式，可以克服与这种结构中的布里渊散射相关的干扰问题，而不需要过多的功耗。

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