Measuring and testing – Borehole or drilling – Pressure measurement
Reexamination Certificate
2007-02-20
2007-02-20
Williams, Hezron (Department: 2856)
Measuring and testing
Borehole or drilling
Pressure measurement
Reexamination Certificate
active
10644284
ABSTRACT:
A method for determining formation fluid pressure in earth formation surrounding a borehole wall uses a downhole probe coupled to a variable-volume cavity. The probe is driven into contact with formation at the borehole wall. The method includes expanding the volume of the cavity during a first period of time to establish fluid communication between tool fluid and formation fluid, by withdrawing a minimal amount of fluid from the formation. During a second period of time the tool pressure is allowed to equilibrate to formation pressure. When pressure equilibrium is established, formation fluid pressure is set equal to tool pressure. A preferred embodiment includes terminating expanding the volume of the cavity on detecting a break in the mud cake seal. An associated formation pressure tester tool includes an elongated body; a probe defining a formation fluid inflow aperture, an electromechanical assembly defining a variable-volume cavity, a pretest flow line coupling the aperture to the cavity, a pressure sensor coupled to the cavity; and downhole electronic means for controlling the expansion of the volume of the cavity.
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Dhruva Brindesh
Dussan V. Elizabeth B.
Jacobson Aaron
Jenet Fredrick A.
Pierre Stephane
DeStefanis Jody Lynn
Lee John L.
Loccisano Vincent P.
Schlumberger Technology Corporation
West Paul M.
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