Boring or penetrating the earth – Processes – Sampling of earth formations
Patent
1984-08-31
1986-08-12
Levy, Stuart S.
Boring or penetrating the earth
Processes
Sampling of earth formations
175246, 175250, E21B 2500, E21B 4902
Patent
active
046050752
ABSTRACT:
A fragmented or unconsolidated core can be cut and retained within a coring tool without substantial disturbance of the core by the use of a shrouded core catcher. A core catcher is concentrically disposed within the coring tool and outside of a smooth, cylindrical sleeve telescopically disposed inside of the core catcher. The core catcher in turn is coupled to a lower assembly which can be selectively longitudinally fixed within the coring tool, but which is otherwise temporarily coupled to the sleeve. As the sleeve is longitudinally pulled upward after the completion of the coring operation, the lower assembly becomes longitudinally fixed within the coring tool and the sleeve, which heretofore has fully covered and concealed the core catcher, begins to be withdrawn from the core catcher, leaving it unconcealed. Ultimately, the core catcher is at least partially uncovered, thereby permitting activation and contact between the core catcher and the core disposed within the coring tool. However, at all times during the coring operation, the core catcher remains concealed behind the cylindrical sleeve which extends in the coring tool throughout the substantial length of the core.
REFERENCES:
patent: 1717271 (1929-06-01), Simmons
patent: 1790542 (1931-01-01), Harvey
patent: 2643858 (1953-06-01), Hardman
patent: 3739865 (1973-06-01), Wolda
patent: 3878904 (1975-04-01), Dobson
Davis J. Stanley
Radford Steven R.
Hannon Thomas R.
Levy Stuart S.
Norton Christensen, Inc.
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