Extension and retraction mechanism for subsurface drilling equip

Details Extension and retraction mechanism for subsurface drilling equip Extension and retraction mechanism for subsurface drilling equip

1996-01-16

1997-08-12

Tsay, Frank

Boring or penetrating the earth

Means traveling with tool to constrain tool to bore along...

Axially spaced opposed bore wall engaging guides

1753251, E21B 706

Patent

active

056556098

ABSTRACT:
A centralizing tool for use in drilling an earth borehole. Drilling fluid pressure extends contact members radially from the tool into engagement with the borehole walls. A timing wheel engages each of the contact members to coordinate their radial movement. A fluid driven tubular central piston extending through the timing wheel causes the wheel to rotate as the piston is moved axially through the tool. High fluid pressure drives the contact members radially outwardly and moves the piston axially to compress a central coil spring surrounding the piston. Reduction of the drilling fluid pressure allows the spring force to return the piston to its initial axial position which rotates the timing wheel to retract the contact elements.

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