Communications: electrical – Wellbore telemetering or control
Reexamination Certificate
2006-11-21
2006-11-21
Garber, Wendy P. (Department: 2635)
Communications: electrical
Wellbore telemetering or control
C367S082000, C367S083000
Reexamination Certificate
active
07138929
ABSTRACT:
A method and system for telemetry through a compressible drilling fluid during underbalanced drilling is disclosed. A reflector (110) is positioned downstream from the gas inlet (84) and causes reflected pressure waves having the same pressure polarity as incident pressure waves. A pressure sensor (92) is positioned below the reflector to sense pressure in the compressible drilling fluid. The reflector (110) can be a fixed orifice plate or an adjustable aperture. A borehole communication system is also disclosed wherein a pair of pressure sensors are positioned on either side of a flow restriction (118) located in the gas conduit leading to the gas injector. The flow restriction can be a valve used to regulate the flow rate of the gas being supplied into the drilling fluid, or it can be separate venturi or orifice plate.
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De Chizelle Yan Kuhn
Jeffryes Benjamin Peter
Dang Hung Q.
DeStefanis Jody Lynn
Gahlings Steven
Garber Wendy P.
Schlumberger Technology Corporation
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