Communications: electrical – Wellbore telemetering or control
Reexamination Certificate
2004-06-08
2008-10-28
Wong, Albert K (Department: 2612)
Communications: electrical
Wellbore telemetering or control
C340S855100, C340S855300, C340S855800
Reexamination Certificate
active
07443312
ABSTRACT:
Improved communication systems and methods are disclosed. In one embodiment, a downhole communications system comprises a downhole transceiver and a surface transceiver. The surface transceiver receives a discrete multi-tone (DMT) modulated uplink signal from the downhole transceiver, and transmits a downlink signal to the downhole transceiver using a modulation method determined by the transceivers as communications are initiated. The downlink modulation methods supported by the surface transceiver may include DMT modulation and quadrature amplitude modulation (QAM). The modulation mode selection may be based on measured channel characteristics, on proposed data rates, or on other predetermined parameters. The uplink and downlink signals may be communicated over a shared transmission mode on multiconductor cable or wired pipe, and alternatively the uplink and downlink signals may be communicated over separate transmission modes.
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DMT definition provided by Wikipedia.
3AM systems modem modulation for V.xx, www.3amsystems.com/wireline/hmo.htm.
Handshaking definition by Wikipedia.
Modulation definition Wikipedia.
Cooper Homi P.
Dodge Carl
Gardner Wallace R.
Quintero Alberto
Halliburton Energy Service,s Inc.
Krueger Daniel J.
Krueger Iselin LLP
Wong Albert K
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