Patent ID: 11905760
Assignee: EPIROC CANADA INC.
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 22:
23. A core drilling system comprising:
a drill string having a predetermined size; and
a core barrel assembly located within the drill string, the core barrel assembly comprising:
an inner tube head assembly having a latch casing coupled to a latch body;
latches housing within the latch body;
a landing shoulder coupled to the latch body and a spindle; and
an inner tube cap assembly coupled between the spindle and an inner tube cap adapter,

wherein the inner tube head assembly is configured to create a first clearance gap and a second clearance gap,
wherein each of the first clearance gap and the second clearance gap are located between an outer surface of the inner tube head assembly and an inner surface of the drill string,
wherein an outer surface of the latch casing, the spindle, the inner tube cap assembly and the inner surface of the drill string are a first size and create the first clearance gap, and
wherein the first size is selected to maximize the first clearance gap to maximize fluid flow around an outer surface of the inner tube head assembly.