Abstract: A system (10) for drilling a borehole (14) in a subterranean formation (16) containing a fluid (18), comprising: an outer tube (24) defining an outer tube distal end (26) configured for attaching a drill bit (12) thereto and a flow controller receiving section (27) spaced apart therefrom; a flow controller (28) including a flow controller body (30) defining body proximal and distal ends (32 and 34) and securable to the outer tube (24) in the flow controller receiving section (27); and a drilling accessory (36) insertable in the outer tube (24) and through the flow controller (28). The flow controller (28) is movable between open and closed configurations. In the open configuration, the flow controller (28) allows passage of the drilling accessory (36) therethrough. In the closed configuration, the flow controller (28) hinders flow of the fluid therethrough towards the borehole proximal end (20) when the flow controller (28) is located closer to the borehole proximal end (20) than the fluid (18).

Abstract: An overshot (10, 100, 200) for handling equipment (12) defining a spearhead point (14). The overshot (10, 100, 200) includes: a substantially elongated overshot body (16); a pair of lifting dogs (18) pivotally mounted to the overshot body (16) so as to be movable between a dog closed configuration and a dog open configuration; and a dog control element (26) operatively coupled to the lifting dogs (18) for selectively controlling the movement of the lifting dogs (18) between the dog closed and open configurations, the dog control element (26) being operable between an armed configuration, a locked configuration and a released configuration. In the armed configuration, the lifting dogs (18) are movable between the dog closed and open configurations for allowing insertion of the spearhead point (14) therebetween; in the locked configuration, the lifting dogs (18) are locked in the dog closed configuration; and in the released configuration, the lifting dogs (18) are positioned in the dog open configuration.

Abstract: A core barrel assembly for retrieving a core sample. The core barrel assembly includes a retrieving element defining an inner tube for retrieving the core sample thereinto, a locking assembly including latch dogs for locking the core retrieving assembly inside the outer tube and a valve assembly mechanically coupled to the locking assembly and provided proximally relative thereto for controlling the flow of fluid across the core barrel assembly. The core barrel assembly is operable in a retrieving configuration in which the latch dogs are retracted and the valve assembly is closed, in a locking configuration in which a locking element locks the latch dogs in an extended configuration and the valve assembly is open and a retrieving configuration, in which the latch dogs are force in a retracted configuration and the valve assembly is open.

Abstract: A drill bit including a body section. The body section defines a body proximal end and a longitudinally opposed body distal end, and a body passageway extending longitudinally therethrough for receiving a fluid and conveying the fluid through the body section. An annular crown section extends longitudinally from the body section, the crown section defining a crown distal end and a longitudinally opposed crown proximal end, the crown section extending distally from the body section, the crown section defining a crown passageway extending longitudinally therethrough and in fluid communication with the body passageway. A flow directing component cooperates with the crown section to define a fluid flow channel extending through the crown section radially outwardly from the crown passageway, the fluid flow channel being self-modifiable upon the crown section reaching a predetermined wear threshold so as to modify a flow of the fluid through the fluid flow channel.

Abstract: A bit for drilling a hole.