Core catcher for use with an hydraulically displaced inner tube

Details Core catcher for use with an hydraulically displaced inner tube Core catcher for use with an hydraulically displaced inner tube

1984-10-01

1987-03-24

Levy, Stuart S.

Boring or penetrating the earth

Processes

Sampling of earth formations

175250, 175403, E21B 2500

Patent

active

046518355

ABSTRACT:
An improved core catcher for use within a coring tool is provided by shaping the lower portion of the core catcher so as to form a collapsible lower section. The collapsible lower section is structurally collapsed as the core catcher is longitudinally displaced within the coring tool to exert a radially compressive force against the core and to thereby seize the core and retain it within the coring tool. In one embodiment, the collapsible lower section is resilient so that it collapses and after operation resumes its original configuration for reuse. In another embodiment, the collapsible lower section is crushable and is therefore not reusable after the first use. The reusable core catcher is devised by providing the lower section of the core catcher with a plurality of thin slots appropriately aligned and extending through the lower section of the core catcher. The nonreusable core catcher is designed to provide a plurality of crushable longitudinal segments of the lower section of the core catcher, and in one embodiment to allow the entire lower section of the core catcher to be crushable.

REFERENCES:
patent: 2747841 (1956-05-01), Adamson et al.
patent: 2893691 (1959-07-01), Johnson
patent: 3540537 (1970-11-01), Brown
patent: 3578093 (1971-05-01), Elenburg
patent: 3854768 (1974-12-01), King, Sr.
patent: 4479557 (1984-10-01), Park et al.

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