Method and apparatus for reducing the vibration and whirling of

Details Method and apparatus for reducing the vibration and whirling of Method and apparatus for reducing the vibration and whirling of

1995-04-17

1996-10-01

Neuder, William P.

Boring or penetrating the earth

With tool shaft detail

Shaft carried guide or protector

1753255, 175408, E21B 1710

Patent

active

055604390

ABSTRACT:
A pair of stabilizers are placed in a string of drill pipe having a drill bit or a coring bit at its lower end, the placement of the stabilizers being such that the distance (d1) between the midpoint (mean transverse section) of the gauge surface of the bit and the midpoint (mean transverse section) of such first stabilizer bears a relationship to the distance (d2) between the midpoints of the two stabilizers. The ratio of d1 to d2 (d1/d2) should be between 1/1.5 to 1/5, and preferably between 1/2 and 1/3, with d1 being maintained less than five feet, preferably less than three feet. In one embodiment, the drill bit and the two stabilizers are formed in a monoblock.

REFERENCES:
patent: 4862974 (1989-09-01), Warren et al.
patent: 4905776 (1990-03-01), Beynet et al.
patent: 4982802 (1991-01-01), Warren et al.
patent: 5090492 (1992-02-01), Keith
patent: 5402856 (1995-04-01), Warren et al.

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