Boring or penetrating the earth – Automatic control – Of fluid pressure below ground
Reexamination Certificate
2005-03-22
2005-03-22
Neuder, William (Department: 3672)
Boring or penetrating the earth
Automatic control
Of fluid pressure below ground
C175S038000, C175S048000
Reexamination Certificate
active
06868920
ABSTRACT:
A method and system for averting or mitigating undesirable drilling events during a drilling process is disclosed. The state of the drilling rig is detected, preferably automatically, based on surface and/or downhole measurement data. One or more undesirable drilling events are detected by correlating the acquired measurement data with the detected state. A drilling rig action is determined which averts or mitigates a detected undesirable drilling event. Finally, the drilling process is overridden by commanding performance of the action.The algorithm used in detecting the most likely rig state is preferably probabilistic in nature, and is even more preferably based on particle filtering techniques.
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Aldred Walt
Dunlop Jonathan
Hoteit Leila
Meehan Richard
Batzer William B.
Curington Tim W.
Schlumberger Technology Corporation
Wan William L.
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