Source: http://www.google.com/patents/US7980326?dq=Frischling
Timestamp: 2014-04-17 18:54:29
Document Index: 582857834

Matched Legal Cases: ['Application No. 2', 'Application No. 2', 'Application No. 04759869', 'Application No. 5771403', 'Application No. 2004', 'Application No. 2005', 'Application No. 34', 'Application No. 98', 'Application No. 20055409', 'Application No. 20070997', 'Application No. 1484']

Patent US7980326 - Method and system for controlling force in a down-hole drilling operation - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA 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...http://www.google.com/patents/US7980326?utm_source=gb-gplus-sharePatent US7980326 - Method and system for controlling force in a down-hole drilling operationAdvanced Patent SearchPublication numberUS7980326 B2Publication typeGrantApplication numberUS 12/271,514Publication dateJul 19, 2011Filing dateNov 14, 2008Priority dateNov 15, 2007Also published asUS20090126994, WO2009065107A1Publication number12271514, 271514, US 7980326 B2, US 7980326B2, US-B2-7980326, US7980326 B2, US7980326B2InventorsGordon A. Tibbitts, Greg Galloway, Adrian Vuyk, Jr., Thomas Alan CarlsonOriginal AssigneePdti Holdings, LlcExport CitationBiBTeX, EndNote, RefManPatent Citations (99), Non-Patent Citations (79), Classifications (5), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetMethod and system for controlling force in a down-hole drilling operationUS 7980326 B2Abstract 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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