Stabilizer for drill strings

Details Stabilizer for drill strings Stabilizer for drill strings

1976-01-21

1977-03-15

Purser, Ernest R.

Boring or penetrating the earth

With tool shaft detail

Shaft carried guide or protector

285333, 285328, 285381, 308 4A, E21B 1710, E21C 900

Patent

active

040119181

ABSTRACT:
Stabilizer apparatus for a rotary drill string, or other running string, including a body structure forming part of the rotary drill string and a stabilizer positioned on an end portion of the body structure, the stabilizer comprising a stabilizer sleeve having a conical interior surface shrink-fitted onto a mating external conical surface of the body structure by fluid pressure actuated or hydraulic means, permitting a safe, strong interconnection between the stabilizer and the drill string body structure. The stabilizer can be readily removed when necessary and replaced with another stabilizer similarly shrink-fitted onto the drill string body structure. The lower end of the stabilizer is internally upset and is received in an annular groove in the body structure, or under the lower end of the body structure, providing a large contact area between the stabilizer and a device threaded on the body structure which engages the lower end of the stabilizer.

REFERENCES:
patent: 1450845 (1923-04-01), Flournoy, Jr.
patent: 2646253 (1953-07-01), Johnston
patent: 3747700 (1973-07-01), Rilling
patent: 3923324 (1975-12-01), Cruickshank et al.
patent: 3942824 (1976-03-01), Sable
patent: 3945446 (1976-03-01), Ostertag et al.

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