Boring or penetrating the earth – Automatic control – Of boring means including a below-ground drive prime mover
Reexamination Certificate
2007-09-21
2010-11-02
Stephenson, Daniel P (Department: 3676)
Boring or penetrating the earth
Automatic control
Of boring means including a below-ground drive prime mover
C175S061000
Reexamination Certificate
active
07823655
ABSTRACT:
Methods and apparatus for using a quill to steer a hydraulic motor when elongating a wellbore in a direction having a horizontal component, wherein the quill and the hydraulic motor are coupled to opposing ends of a drill string, by monitoring an actual toolface orientation of a tool driven by the hydraulic motor via monitoring a drilling operation parameter indicative of a difference between the actual toolface orientation and a desired toolface orientation, and then adjusting a position of the quill by an amount that is dependent upon the monitored drilling operation parameter.
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Defendant Helmerich & Payne's Invalidity Contentions; Case 6:09-cv-00414-LED; Mar. 25, 2010.
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Boone Scott
Ellis Brian
Kuttel Beat
Papouras Chris
Scarborough John Thomas
Canrig Drilling Technology Ltd.
Haynes and Boone LLP
Stephenson Daniel P
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