Boring or penetrating the earth – Processes – Sampling of earth formations
Patent
1978-08-08
1980-10-28
Pate, III, William F.
Boring or penetrating the earth
Processes
Sampling of earth formations
175233, 175237, 175239, 175242, E21B 920
Patent
active
042301920
ABSTRACT:
Coring apparatus for obtaining core samples which may comprise: an outer barrel assembly, the lower end of which is adapted for connection to a core bit, the upper end of which is adapted for connection to a drill string; an inner barrel assembly concentrically disposed within the outer barrel assembly and having first and second axially spaced and fluid communicating chambers therein; and valve means carried by the inner barrel assembly and movable from an open position, in which a core sample may be received by the first chamber, to a closed position, sealingly enclosing the core sample within the first chamber. A method of obtaining core samples with the coring apparatus may comprise the steps of: lowering the coring apparatus and a core bit into a well bore on a drill string; rotating the drill string so the core bit cuts away an annular area at the bottom of the well bore, leaving a substantially cylindrical core extending upwardly into the inner barrel assembly; breaking the core near the base thereof to provide a core sample of desired length; continuing to rotate the drill string until the broken core sample is totally within the first chamber; lifting the drill string to clear core remaining in the well bore; actuating the valve assembly to sealingly enclose the core sample within the inner barrel assembly; and raising the coring apparatus to the surface of the well while allowing at least some of the fluid contained in the core sample to expand into the second chamber.
REFERENCES:
patent: 2347726 (1944-05-01), Auld et al.
patent: 2734719 (1956-02-01), Otway
patent: 3146837 (1964-09-01), Bridwell
patent: 3548958 (1970-12-01), Blackwell
patent: 4142594 (1979-03-01), Thompson
Berryhill Bill B.
Pate III William F.
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