Apparatus and method for obtaining a core at in situ pressure

Details Apparatus and method for obtaining a core at in situ pressure Apparatus and method for obtaining a core at in situ pressure

1980-03-07

1982-03-02

Novosad, Stephen J.

Boring or penetrating the earth

Boring without earth removal

Combined with earth removal

175 59, 175233, 175234, 175236, E21B 2504, E21B 2518, E21B 4900

Patent

active

043174906

ABSTRACT:
A method and apparatus are disclosed for obtaining a core at in situ pressure of sedimentary deposits at the bottom of a well bore or body of water. The core barrel has a pressure chamber that is closed and opened by a ball valve actuated from the surface. When in position above the sedimentary deposits to be cored, a sample tube is extended from the pressure chamber into the sedimentary deposits to obtain a core. The sample tube is retracted into the pressure chamber and the valve closed to trap ambient pressure in the chamber. The sample tube and valve are operated from the surface.

REFERENCES:
patent: 2256552 (1941-09-01), Drake
patent: 2326435 (1943-08-01), Bynum
patent: 2364088 (1944-12-01), Miller et al.
patent: 2541785 (1951-02-01), Smith
patent: 2740477 (1956-04-01), Monaghan
patent: 3095051 (1963-06-01), Robinsky et al.
patent: 3139147 (1964-06-01), Hays et al.
patent: 3930413 (1976-01-01), Laird et al.

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