latch body of a core cylinder assembly, core cylinder head assembly, core drilling system to retrieve core core, and drilling method

摘要

latch body of a core cylinder assembly, core cylinder head assembly, drilling system for retrieving a core sample, and drilling method. Embodiments of the present invention include a core cylinder assembly including external fluid passages generally extending axially along the outer surface of the core cylinder assembly. one or more external fluid passages may allow increased fluid flow around a latch mechanism. increased fluid flow around the latch mechanism may allow the core cylinder assembly to move faster within the drill string, it may allow drilling fluid to pass through the latch mechanism when engaged. Embodiments of the present invention may also include drilling systems including external fluid passages and methods of retrieving a core sample using such drilling systems.