Boring or penetrating the earth – Automatic control – Of advance or applied tool weight
Reexamination Certificate
2011-07-19
2011-07-19
Stephenson, Daniel P (Department: 3676)
Boring or penetrating the earth
Automatic control
Of advance or applied tool weight
C175S038000
Reexamination Certificate
active
07980326
ABSTRACT:
A method and system of subterranean excavating that estimates a buoyancy force applied to a downhole excavating system from drilling fluid. The estimated buoyancy force is used to derive a true weight on bit (WOB) at the borehole bottom. The derived realized WOB is compared to a target WOB to obtain a change in WOB. Based on the change in WOB, the excavating system is adjusted so the realized WOB approximates the target WOB. The excavating system adjustment includes applying a compensating force to the string. Compensating forces can be produced by manipulating a block assembly or deploying a thruster device in the string.
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Carlson Thomas Alan
Galloway Greg
Tibbitts Gordon A.
Vuyk, Jr. Adrian
PDTI Holdings, LLC
Stephenson Daniel P
Vedder Price P.C.
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