Boring or penetrating the earth – With signaling – indicating – testing or measuring
Reexamination Certificate
2006-08-01
2006-08-01
Gay, Jennifer H. (Department: 3671)
Boring or penetrating the earth
With signaling, indicating, testing or measuring
C175S320000, C324S303000, C324S356000, C166S066000
Reexamination Certificate
active
07083006
ABSTRACT:
An MWD method and apparatus for determining parameters of interest in a formation has a sensor assembly mounted on a slidable sleeve slidably coupled to a longitudinal member, such as a section of drill pipe. When the sensor assembly is held in a non-rotating position, for instance for obtaining the measurements, the longitudinal member is free to rotate and continue drilling the borehole, wherein downhole measurements can be obtained with substantially no sensor movement or vibration. This is particularly useful in making NMR measurements due to their susceptibility to errors due caused by tool vibration. In addition, the substantially non-rotating arrangement of sensors makes it possible to efficiently carry out VSPs, reverse VSPs and looking ahead of the drill bit. A clamping device is used, for instance, to hold the sensor assembly is held in the non-rotating position. The sensor assembly of the present invention can include any of a variety of sensors and/or transmitters for determining a plurality of parameters of interest including, for example, nuclear magnetic resonance measurements.
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Krueger Volker
Kruspe Thomas
Baker Hughes Incorporated
Beach Thomas A
Gay Jennifer H.
Madan Mossman & Sriram P.C.
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