Using hydrostatic bearings for downhole applications

Details Using hydrostatic bearings for downhole applications Using hydrostatic bearings for downhole applications

2011-05-17

2011-05-17

Neuder, William P (Department: 3672)

Boring or penetrating the earth

Processes

Boring curved or redirected bores

C175S076000

Reexamination Certificate

active

07942213

ABSTRACT:
Hydrostatic bearings are used for drill string stabilization and bottom hole assembly steering. The hydrostatic bearings utilize an existing mud flow as the bearing fluid. For steering, the bearings may be used between movable kick pads and the formation to reduce friction. Alternatively, differential hydrostatic bearing pressure may be utilized to steer. Multi-modal (non-linear and linear) steering may be provided by selectively applying equal and unequal hydrostatic bearing pressures. The bearings can be made more tolerant of imperfections in the formation by utilizing multiple pressure pockets.

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Website Printout entitled “Drill String Torque Reducer” from http//www.pdc-uk.com/products/dstr by Pilot Drilling Control ltd, Nouvotech House, Harbour Road Ind. Est., Lowestoft, Suffolk, NR32 3LZ, UK.
Website Printout entttled “Spiro-Torq®” from http://www.drilltech.com/spirotorq.htm by Drilltech House, Greenwell Road, East Tullos, Aberdeen, AB12 3AX, Scotland, UK.
Fuller et al., “Improved Means of Reducing Drag in ERD Applications”, SPE 76759, May 20-22, 2002.
Boulet et al., Improved Hole Cleaning and Reduced Rotary Torque by New External Profile on Drilling Equipment, IADC/SPE 59143, Feb. 23-25, 2000.
Slocum., “Precision Machine Design”, Chapter 9 entitled “Bearings without Mechanical Contact Between Elements”, pp. 551-580, SME, Prentice-Hall, Inc. 1992.

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