Upper head assembly for a core barrel

An upper inner tube head assembly that is coupled to a lower inner tube head assembly through a coupling area to form an axially movable inner tube assembly within a drilling pipe assembly of a system for the extraction of samples by means of a core barrel, comprising:

• a main body on which a retractable body is slidably and concentrically mounted, a support component whose axial upward movement is restricted by a main body seat and downwardly by a rear component whose inner surface of rear component cooperates with an outer surface of the main body;
• and
• a means of fluid control to increase the fluid flow during movement of the inner tube assembly within a drilling pipe assembly, the means of fluid control comprising:
• at least one closing/opening body having at least one valve component which is connected through a valve component connector to the retractable body, where the valve component moves on a sliding surface of the main body and sits on the support component when the inner tube assembly is lowered into a working position of the inner tube assembly and moves away from the inner tube assembly when the inner tube assembly moves away from the working position of the inner tube assembly, and
• a fluid bypass chamber arranged within the main body and communicating with the outer surface of the main body in at least two different positions along the chamber or at least one rapid lowering area formed between the sliding surface of the main body together with the inner surface of the support component and the rear component, said at least one rapid lowering area is a fluid passage channel for fluid flow externally to the main body, and formed to allow free flow of fluid along a fluid passage path during the lowering of the inner tube assembly.