Technique for damping oscillations in a drill string

Details Technique for damping oscillations in a drill string Technique for damping oscillations in a drill string

1980-09-08

1984-08-21

Pate, III, William F.

Boring or penetrating the earth

Processes

Boring with specific fluid

175321, E21B 1707

Patent

active

044664966

ABSTRACT:
There is disclosed a shock sub for incorporation in the lower part of a drill string for damping oscillations of the bit and drill string during drilling. The shock sub incorporates a spring assembly including a multiplicity of substantially annular ring springs that exhibit a spring rate of less than about 25,000 pounds per inch of deflection.

REFERENCES:
patent: 3301009 (1967-01-01), Coulter, Jr.
patent: 3383126 (1968-05-01), Salvetoir et al.
patent: 3853188 (1974-12-01), Vasiliev
patent: 3963228 (1976-06-01), Karle

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