发明名称 |
TECHNIQUE FOR SIGNAL DETECTION USING ADAPTIVE FILTERING IN MUD PULSE TELEMETRY |
摘要 |
<p>a mud pulse telemetry adaptive noise canceller (ANC) is provided to provide information on down hole conditions during a Measurement-While-Drilling/Logging-While-Drilling (MWD/LWD) operation. The ANC (181) employs a Signal Conditioning Box (175), Anti-Aliasing Filter (177) and two transducers, each receiving a succession of signals due to a transmission device (158). A primary transducer (163), located downhole from both a mud pump (151) and a desurger, receives a primary signal. A reference transducer (165), located near the mud pump (151) and upstream from the desurger (153), receives a reference signal. The ANC linearly relates the reference signal to the primary signal by means of a recursive least squares algorithm and calculates weighting coefficients. The ANC (181) uses weighing coefficients to process a subsequent primary signal, thus enhancing transmission of MWD and/or LWD data thru a downhole drillpipe (157) via the medium of Mud Flow (155).</p> |
申请公布号 |
WO0146548(A2) |
申请公布日期 |
2001.06.28 |
申请号 |
WO2000US42725 |
申请日期 |
2000.12.08 |
申请人 |
W-H ENERGY SERVICES, INC. |
发明人 |
ABDALLAH, ALI, H.;BEATTIE, MARK, S. |
分类号 |
E21B47/18;(IPC1-7):E21B/ |
主分类号 |
E21B47/18 |
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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