Abstract: Earth-boring drill bits include a bit body, an erosion-resistant extension, and a shank. The erosion-resistant extension includes a generally tubular body, and an erosion-resistant material lining the generally tubular body within a fluid passageway. The erosion-resistant material lining the generally tubular body within the fluid passageway exhibits an erosion resistance greater than an erosion resistance exhibited by a material of the generally tubular body. Methods of forming an erosion-resistant extension include lining at least a portion of a wall of a generally tubular body within a fluid passageway extending through the generally tubular body with an erosion-resistant material.

Abstract: Methods of coupling a bearing assembly to a downhole tool include forming at least a portion of a downhole component from a diamond-enhanced material, applying a metal material to a surface of the downhole component using an ultrasonic molten metal process, and coupling at least a portion of the surface of the downhole component to at least another component of the downhole tool. Downhole tools include at least one component of a bearing assembly that is configured to move relative to a portion of the downhole tool. The at least one bearing component comprises a diamond-enhanced material and is coupled to a portion of the downhole tool by an ultrasonic molten metal process.

Abstract: Earth-boring drill bits include a bit body, an erosion-resistant extension, and a shank. The erosion-resistant extension includes a generally tubular body, and an erosion-resistant material lining the generally tubular body within a fluid passageway. The erosion-resistant material lining the generally tubular body within the fluid passageway exhibits an erosion resistance greater than an erosion resistance exhibited by a material of the generally tubular body. Methods of forming an erosion-resistant extension include lining at least a portion of a wall of a generally tubular body within a fluid passageway extending through the generally tubular body with an erosion-resistant material.

Abstract: A shrink-fit sleeve assembly comprising a bit body includes at least one sleeve port with a substantially tubular sleeve disposed therein and interferingly engaged therewith. The sleeve port includes an internal surface of substantially circular cross-section, and the tubular sleeve includes an internal nozzle port and an external surface of substantially circular cross-section. A lateral dimension of an external surface is equal to or greater than a first dimension at ambient temperature. A nozzle assembly and a method of manufacturing or retrofitting a drill bit are also disclosed.

Abstract: A shrink-fit sleeve assembly comprising a bit body includes at least one sleeve port with a substantially tubular sleeve disposed therein and interferingly engaged therewith. The sleeve port includes an internal surface of substantially circular cross-section, and the tubular sleeve includes an internal nozzle port and an external surface of substantially circular cross-section. A lateral dimension of an external surface is equal to or greater than a first dimension at ambient temperature. A nozzle assembly and a method of manufacturing or retrofitting a drill bit are also disclosed.

Abstract: A shrink-fit sleeve assembly comprising a bit body includes at least one sleeve port with a substantially tubular sleeve disposed therein and interferingly engaged therewith. The sleeve port includes an internal surface of substantially circular cross-section, and the tubular sleeve includes an internal nozzle port and an external surface of substantially circular cross-section. A lateral dimension of the external surface is equal to or greater than the first dimension at ambient temperature. A nozzle assembly and a method of manufacturing or retrofitting a drill bit are also disclosed.

Abstract: A rotary-type drill bit for drilling subterranean formations having areas or components having surfaces exhibiting a relatively low adhesion, preferably nonwater-wettable, surface over at least a portion thereof.