An earth-boring tool may include at least one blade including a shoulder region and a face. A plurality of cutting elements may be arranged on the face of the blade and at least one cutting element may be positioned in the shoulder region such that a cutting face of the at least one cutting element is spaced a distance behind the face of the blade. A recessed portion of the blade may extend under at least one of the plurality of cutting elements arranged on the face of the blade and extending to the at least one cutting element positioned in the shoulder region.

An earth-boring tool may include at least one blade including a shoulder region and a face. A plurality of cutting elements may be arranged on the face of the blade and at least one cutting element may be positioned in the shoulder region such that a cutting face of the at least one cutting element is spaced a distance behind the face of the blade. A recessed portion of the blade may extend under at least one of the plurality of cutting elements arranged on the face of the blade and extending to the at least one cutting element positioned in the shoulder region.

A drill bit is provided. The drill bit includes a bit body and an axle disposed in the bit body. The axle includes a first axle portion extending in a longitudinal direction and a second axle portion extending in the longitudinal direction. A longitudinal end of the first axle portion is continuous with a longitudinal end of the second axle portion. When viewed from the longitudinal direction, the first axle portion and the second axle portion are not coaxial, and an outer perimeter of the first axle portion is located entirely within an outer perimeter of the second axle portion. The drill bit also includes a first cutter disposed on the first axle portion and a second cutter disposed on the second axle portion.

A drill bit is provided. The drill bit includes a bit body and an axle disposed in the bit body. The axle includes a first axle portion extending in a longitudinal direction and a second axle portion extending in the longitudinal direction. A longitudinal end of the first axle portion is continuous with a longitudinal end of the second axle portion. When viewed from the longitudinal direction, the first axle portion and the second axle portion are not coaxial, and an outer perimeter of the first axle portion is located entirely within an outer perimeter of the second axle portion. The drill bit also includes a first cutter disposed on the first axle portion and a second cutter disposed on the second axle portion.

A hybrid wellbore drilling bit assembly and a method for drilling a borehole with a hybrid wellbore drilling bit assembly are described. A base connects the hybrid wellbore drill bit assembly to a drill string. Blades are connected to the base, extending away from the base along the longitudinal axis and tapering toward the longitudinal axis of the hybrid wellbore drilling bit assembly base creating a tapered cavity. The blades have cutters to shear a core of the Earth that enters the cavity. The core of Earth expands in the cavity. A crusher is connected to the base and positioned within the cavity which crushes the core of Earth.

A hybrid wellbore drilling bit assembly and a method for drilling a borehole with a hybrid wellbore drilling bit assembly are described. A base connects the hybrid wellbore drill bit assembly to a drill string. Blades are connected to the base, extending away from the base along the longitudinal axis and tapering toward the longitudinal axis of the hybrid wellbore drilling bit assembly base creating a tapered cavity. The blades have cutters to shear a core of the Earth that enters the cavity. The core of Earth expands in the cavity. A crusher is connected to the base and positioned within the cavity which crushes the core of Earth.

A method of improving the service life of a drill bit comprises creating a weldment between load bearing portions of the drill bit where the weldment has a preselected root gap greater than about 25 mils and a preselected root face greater than about 25 mils, and where the weldment has a material property greater than the materials being joined.

A method of improving the service life of a drill bit comprises creating a weldment between load bearing portions of the drill bit where the weldment has a preselected root gap greater than about 25 mils and a preselected root face greater than about 25 mils, and where the weldment has a material property greater than the materials being joined.

A hybrid rotary drill bit having at least one fixed blade and at least one rolling cutter assembly is configured for reverse fluid flow from an annulus, through junk slots and into a fluid pathway system located substantially centrally to a bit body. The fluid pathway system may be located underneath a portion of the at least one fixed blade.

A hybrid rotary drill bit having at least one fixed blade and at least one rolling cutter assembly is configured for reverse fluid flow from an annulus, through junk slots and into a fluid pathway system located substantially centrally to a bit body. The fluid pathway system may be located underneath a portion of the at least one fixed blade.