Drilling system and method

Boring or penetrating the earth – With signaling – indicating – testing or measuring – Measuring or indicating drilling fluid rate of flow

Reexamination Certificate

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Details

C166S053000, C175S038000, C702S013000, C703S010000, C073S152210

Reexamination Certificate

active

07044237

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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