发明名称 |
MODULATION SCHEME FOR HIGH SPEED MUD PULSE TELEMETRY WITH REDUCED POWER REQUIREMENTS |
摘要 |
A method for transmitting data from a downhole location to a location at the surface of the earth includes: receiving data using a modulator disposed at the downhole location on a drill tubular in a borehole penetrating the earth and modulating the data using offset quadrature phase shift keying (OQPSK) and smooth transitions between phase shifts to produce a series of two-bit symbols having smooth transitions in transition intervals between phase shifts of both in-phase and quadrature-phase components of the OQPSK modulated data. The method further includes transmitting the series of two-bit symbols as an acoustic signal in drilling fluid disposed in the borehole using a mud-pulser, receiving the acoustic signal using a receiver disposed uphole from the downhole location; and demodulating the acoustic signal using a demodulator coupled to the receiver to provide demodulated data. |
申请公布号 |
WO2016134143(A1) |
申请公布日期 |
2016.08.25 |
申请号 |
WO2016US18464 |
申请日期 |
2016.02.18 |
申请人 |
BAKER HUGHES INCORPORATED |
发明人 |
MAHMOUD, Sameh Amr Hassanein;BRUNS, Jens Uwe;EMMERICH, Wojciech;GATZEN, Matthias |
分类号 |
E21B47/12;E21B47/18;E21B47/20 |
主分类号 |
E21B47/12 |
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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