发明名称 |
METHOD AND APPARATUS FOR MULTI-CHANNEL DOWNHOLE ELECTROMAGNETIC TELEMETRY |
摘要 |
An electromagnetic (EM) telemetry method comprises encoding downhole data into a single data stream; separating the single data stream into a plurality of separate data streams; converting each separate data stream into a corresponding separate waveform using a selected digital modulation technique wherein at least one of the frequency and phase of each waveform is assigned a unique value or unique non-overlapping range of values; combining each separate waveform into a combined waveform; and transmitting from a downhole location, an electromagnetic (EM) telemetry carrier wave comprising the combined waveform. |
申请公布号 |
EP2929142(A4) |
申请公布日期 |
2016.07.27 |
申请号 |
EP20130860325 |
申请日期 |
2013.12.06 |
申请人 |
EVOLUTION ENGINEERING INC. |
发明人 |
XU, MINGDONG;LIU, JILI;SWITZER, DAVID A.;LOGAN, AARON W. |
分类号 |
E21B47/13;E21B47/02;H04B1/40;H04B13/02;H04L27/00;H04L27/26 |
主分类号 |
E21B47/13 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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