Measuring and testing – Borehole or drilling – During drilling
Reexamination Certificate
2010-11-15
2011-12-06
Fitzgerald, John (Department: 2856)
Measuring and testing
Borehole or drilling
During drilling
Reexamination Certificate
active
08069716
ABSTRACT:
A downhole drilling apparatus for measure while drilling including a housing defining a longitudinal housing axis, wherein the housing has an upper end and a lower end. A motor includes a rotor, wherein the rotor is adapted to be driven by drilling fluids. A first drive coupling is coupled between the rotor and a first driven rod. A second drive coupling is coupled between the driven rod an a connecting shaft. A third drive coupling is coupled between the connecting shaft and a second driven rod. A fourth drive coupling is coupled between the second driven rod and a motor bearing section, wherein the connecting shaft extends through an offset bore in the housing and transmits power from the motor to the drill bit.
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Fitzgerald John
Locklar Adolph
Scientific Drilling International Inc.
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