Measuring and testing – Borehole or drilling – Pressure measurement
Reexamination Certificate
2007-10-09
2011-10-04
Allen, Andre (Department: 2855)
Measuring and testing
Borehole or drilling
Pressure measurement
Reexamination Certificate
active
08028571
ABSTRACT:
Apparatus and method for determining pressure in a well is provided. A sensor for determining the rate of change of pressure in a well comprises: a first cavity body defining an enclosed volume, a portion of one wall of the cavity body being constituted by a pressure sensitive membrane capable of exposure to the well pressure so as to be responsive thereto; and a first capillary connected to the first cavity body at one end and being open to the well pressure at the other end so as to provide pressure communication between the well pressure and the interior of the first cavity body; wherein a length of the first capillary, an internal diameter of the first capillary, and the volume of the first cavity body are such that the sensor has a predetermined pressure response that comprises an input minus a low-pass filtered version of the input, and a predetermined time constant.
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Allen Andre
Georgellis George
Griffin Jeffrey E.
Schlumberger Technology Corporation
Stout Myron
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