Boring or penetrating the earth – With signaling – indicating – testing or measuring – Measuring or indicating drilling fluid rate of flow
Reexamination Certificate
2008-02-27
2010-10-05
Wright, Giovanna C (Department: 3672)
Boring or penetrating the earth
With signaling, indicating, testing or measuring
Measuring or indicating drilling fluid rate of flow
C175S050000, C175S065000
Reexamination Certificate
active
07806202
ABSTRACT:
In an underbalanced drilling system and method, a change is induced in flowing bottom hole pressure in a wellbore. Data of the surface flow rate of effluent is then measured in response to the induced change. This measured data is obtained using a multi-phase flow meter before a separator of the underbalanced drilling system. Algorithms in computer software analyze the flowing bottomhole pressure and the measured surface flow rate data and determine both permeability and formation pressure for a portion of the wellbore in real-time during the underbalanced drilling operation. Ultimately, portion of the wellbore is characterized with the determined permeability and formation pressure.
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Precision Energy Services, Inc.
Wong Cabello Lutsch Rutherford & Brucculeri LLP
Wright Giovanna C
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