Method and system for controlling force in a down-hole drilling operation
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United States of America Patent
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Jul 19, 2011
Grant Date -
May 21, 2009
app pub date -
Nov 14, 2008
filing date -
Nov 15, 2007
priority date (Note) -
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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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