Method and apparatus for taking core samples from a subterranean

Details Method and apparatus for taking core samples from a subterranean Method and apparatus for taking core samples from a subterranean

1985-08-12

1986-12-16

Novosad, Stephen J.

Boring or penetrating the earth

Processes

Sampling of earth formations

175251, 175284, 175403, E21B 4902

Patent

active

046290117

ABSTRACT:
Apparatus for extracting core samples from the side walls of a subterranean well bore comprises an axial force generating tool insertable into the well with such tool carrying a stationary support rod and the movable element of such tool producing a movement of a housing surrounding the stationary support rod. Annular core forming tools are mounted on plural anvil plates disposed on sides of the stationary support rod and such tools are moved into penetrating relationship with the well bore side wall through association with a linkage between the movable housing, the anvil plates, and the stationary support rod. The movement of the axial force generating element is opposed by a resistance element. A limit to the maximum force applied to the core forming tools is provided by a shearable element series connected in the stationary support rod. Fluid dampening is provided for the decompression movement of the resistance element subsequent to the shearing of the stationary support rod to avoid dislodgement of the entrapped core samples by impact forces.

REFERENCES:
patent: 1730705 (1929-10-01), Wild
patent: 2053698 (1936-09-01), Church
patent: 2354399 (1944-07-01), Noble
patent: 3330367 (1967-07-01), Redwine
patent: 3630296 (1971-12-01), Bullard

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