Core sampling apparatus and method

Patent · Tue Oct 28 04:00:00 EST 1980

OSTI ID:6525812

Pfannkuche, F T

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.

• Assignee: IFI; EDB-81-071725
• Patent Number(s): US 4230192
• OSTI ID: 6525812
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
CORING EQUIPMENT
DESIGN
DRILL CORES
DRILLING EQUIPMENT
EQUIPMENT
NATURAL GAS WELLS
OIL WELLS
SAMPLING
WELLS