Fluid control assemblies, and core barrel and overshot assemblies comprising same

摘要

Fluid control assemblies including at least one spiral ring. The fluid control assemblies are used within core barrel assemblies to: provide an indication that a core barrel assembly has reached a drilling position and is latched to a drill string; serve as a mechanical shut-off valve that restricts the flow of drilling fluid within a core barrel assembly; and/or serve as a grease seal at the connection between an inner tube cap and an inner tube that receives a core sample.