Measuring and testing – Borehole or drilling – Pressure measurement
Reexamination Certificate
2006-12-26
2006-12-26
Williams, Hezron (Department: 2856)
Measuring and testing
Borehole or drilling
Pressure measurement
C073S152260
Reexamination Certificate
active
07152466
ABSTRACT:
Methods and apparatus for rapidly measuring pressure in earth formations are disclosed. According to a first embodiment of the apparatus, a probe is provided with a movable piston having a sensor built into the piston. According to a second embodiment of the apparatus, the pressure sensor is mounted adjacent to or within the piston cylinder and a fluid pathway is provided from the sensor to the interior of the cylinder. Methods of operating the first and second embodiments include delivering the probe to a desired location in a borehole, setting the probe against the formation, and withdrawing the piston to draw down fluid for pressure sensing. A third embodiment of the probe is similar to the second but is provided with a spring loaded metal protector surrounding the cylinder and an annular rubber facing. The third embodiment is preferably used in a semi-continuous pressure measuring tool or an LWD tool having a piston controlled bowspring and a piston controlled articulated member carrying the probe. The tool is moved in a semi-set mode and when located at a desired depth is rapidly put in a fully-set mode.
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Donzier Eric
Ramakrishnan Terizhandur S.
DeStefanis Jody Lynn
Fitzgerald John
Gaudier Dale
Gordon David P.
Schlumberger Technology Corporation
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