Boring or penetrating the earth – With signaling – indicating – testing or measuring – Measuring or indicating drilling fluid rate of flow
Reexamination Certificate
2007-10-09
2007-10-09
Gay, Jennifer H (Department: 3672)
Boring or penetrating the earth
With signaling, indicating, testing or measuring
Measuring or indicating drilling fluid rate of flow
C166S053000, C175S038000, C702S013000, C703S010000, C073S152210
Reexamination Certificate
active
11263857
ABSTRACT:
A closed-loop circulating system for drilling wells has control of the flow rates in and out of the wellbore. Kicks and fluid losses are quickly controlled by adjusting the backpressure. Kick tolerance and tripping margins are eliminated by real-time determination of pore and fracture pressure. The system can incorporate a rotating BOP and can be used with underbalanced drilling.
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