A venturi jet basket assembly adapted to be coupled to a tubing that extends into a wellbore includes a body and a jet nozzle subassembly. The body includes a wall that defines a passageway that extends longitudinally through the body. The body also includes an opening extending through the wall and into the passageway. The wall also includes a flute formed in an outer surface of the wall of the body. The flute is in fluid communication with the opening. The jet nozzle subassembly is disposed within the passageway and includes a jet nozzle. The jet nozzle is arranged to direct fluid received through the tubing through the opening and into the flute such that the fluid is guided into the wellbore by the flute.

A venturi jet basket assembly adapted to be coupled to a tubing that extends into a wellbore includes a body and a jet nozzle subassembly. The body includes a wall that defines a passageway that extends longitudinally through the body. The body also includes an opening extending through the wall and into the passageway. The wall also includes a flute formed in an outer surface of the wall of the body. The flute is in fluid communication with the opening. The jet nozzle subassembly is disposed within the passageway and includes a jet nozzle. The jet nozzle is arranged to direct fluid received through the tubing through the opening and into the flute such that the fluid is guided into the wellbore by the flute.

A drill bit for cutting a hole in a formation. The drill bit has a shank and a crown. The crown has a plurality of crown portions that are spaced about an operative circumference of the drill bit. The shank and crown cooperate to define an interior space that receives water or other drilling fluid. Each crown portion has two longitudinal edges, an outer surface, at least one inner surface and a cutting face. The crown has a base surface that is spaced from the cutting faces of the crown portions and cooperates with the inner surface of each of the two crown portions to define a slot.

Continuous fiber-reinforced hard composites may be useful in mitigating crack propagation in downhole tools. In some instances, a wellbore tool may be formed at least in part by a continuous fiber-reinforced hard composite portion. The continuous fiber-reinforced hard composite portion includes a binder material continuous phase with reinforcing particles and continuous fibers contained therein, wherein the continuous fibers have an aspect ratio at least 15 times greater than a critical aspect ratio (Ac). The critical aspect ratio can be determined using the equation Ac=f/(2c), f is an ultimate tensile strength of the continuous fibers, and C is a lower of (1) an interfacial shear bond strength between the continuous fibers and the binder material and (2) a yield stress of the binder material.

Continuous fiber-reinforced hard composites may be useful in mitigating crack propagation in downhole tools. In some instances, a wellbore tool may be formed at least in part by a continuous fiber-reinforced hard composite portion. The continuous fiber-reinforced hard composite portion includes a binder material continuous phase with reinforcing particles and continuous fibers contained therein, wherein the continuous fibers have an aspect ratio at least 15 times greater than a critical aspect ratio (Ac). The critical aspect ratio can be determined using the equation Ac=f/(2c), f is an ultimate tensile strength of the continuous fibers, and C is a lower of (1) an interfacial shear bond strength between the continuous fibers and the binder material and (2) a yield stress of the binder material.

An earth-boring tool includes a tool body having an aperture therein defining a nozzle port, a nozzle or nozzle assembly disposed in the nozzle port, and a shape memory material disposed adjacent a surface of at least one component of the nozzle or nozzle assembly. The shape memory material retains at least one component of the nozzle or nozzle assembly by a threadless connection. The threadless connection includes mechanical interference between the shape memory material, the at least one component of the nozzle or nozzle assembly, and the tool body or another component of the nozzle or nozzle assembly. The shape memory material is formulated and configured to transform from a first phase and a first shape upon heating and to transform from a second phase and a second shape upon cooling.

An earth-boring tool includes a tool body having an aperture therein defining a nozzle port, a nozzle or nozzle assembly disposed in the nozzle port, and a shape memory material disposed adjacent a surface of at least one component of the nozzle or nozzle assembly. The shape memory material retains at least one component of the nozzle or nozzle assembly by a threadless connection. The threadless connection includes mechanical interference between the shape memory material, the at least one component of the nozzle or nozzle assembly, and the tool body or another component of the nozzle or nozzle assembly. The shape memory material is formulated and configured to transform from a first phase and a first shape upon heating and to transform from a second phase and a second shape upon cooling.

A drill bit comprises a bit body having a body face. A plurality of fixed blades extends from the bit body. Each of the plurality of fixed blades has a leading face and a trailing face. A plurality of nozzles is disposed on the body face to flow drilling fluid out of the bit body. A plurality of flow guides direct a portion of the drilling fluid away from the bit body. Each of the plurality of flow guides extends longitudinally from the body face, and along the leading face of one of the plurality of fixed blades.

A drill bit comprises a bit body having a body face. A plurality of fixed blades extends from the bit body. Each of the plurality of fixed blades has a leading face and a trailing face. A plurality of nozzles is disposed on the body face to flow drilling fluid out of the bit body. A plurality of flow guides direct a portion of the drilling fluid away from the bit body. Each of the plurality of flow guides extends longitudinally from the body face, and along the leading face of one of the plurality of fixed blades.

A self-directing nozzle of a drill bit of a downhole tool and method are disclosed. The drill bit with the nozzle may be used to form a wellbore in a subterranean formation. The drill bit has a passage for fluid to pass through. The nozzle includes a case positionable in the passage of the drill bit and a movable body movably positionable in the case. The movable body has a channel for passage of the fluid therethrough. The channel has a non-linear shape with a channel axis extending therethrough. The channel axis is curved to define a spiral flow path therethrough whereby the fluid passing through the channel facilitates rotation of the movable body within the passage of the drill bit.