Rotary stick, slip and vibration reduction drilling stabilizers with hydrodynamic fluid bearings and homogenizers

A method for reducing rotational friction, shocks and vibrations associated with bearing a rotatable shaft (2) within a subterranean bore, comprising the steps of:

• providing a hydrodynamic bearing (1, 12) disposed about said rotatable shaft and within a wall (7) of said subterranean bore, wherein said hydrodynamic bearing comprises at least one periphery arced wall (4) radially extending from and arranged about a circumference of an outer wall (5) of a conduit shaft housing (14) which is disposed about at least one inner wall (6, 13) adjacent to at least one associated hydrodynamic profiled wall (3) rotatable by or about said rotatable shaft and within said conduit shaft housing to displace fluid axially along at least one other of said walls using rotation of said at least one associated hydrodynamic profiled wall (3),
• wherein frictional engagements of said fluid, said at least one associated hydrodynamic profiled wall (3), said at least one inner wall (6, 13) or said at least one periphery arced wall (4), engaged with and disposed between said rotatable shaft (2) and said wall (7) of said subterranean bore, are used to anchor at least one of said walls relative to said at least one associated hydrodynamic profiled wall (3), forming an anchored wall, relative to said rotation of said at least one associated hydrodynamic profiled wall by said rotatable shaft, to force said fluid between said at least one associated hydrodynamic profiled wall and said anchored wall, to form a set of at least two of said walls with fluid flow between said at least two of said walls;
• and
• rotating said rotatable shaft to form a pressurized (8) cushion bearing fluidly communicated to and from said at least two of said walls to, in use, lubricate and dampen said rotational shocks and vibrations using said pressurized cushion bearing and a shearing of said frictional engagements between said at least two of said walls bearing said rotating shaft within said subterranean bore.