Drilling bit with integral stabilizer

Claim 2

A well-drilling tool for use on the lower end of a drilling string and having a rotary drill body portion with rotatable cutter means thereon wherein the improvement comprises: legs on said body portion having downwardly and outwardly slanting shirttail portions, the lower end of said shirttail portions comprising outer diameter surfaces of the tool, said cutters being mounted for rotation on said legs, said cutters, upon rotation of said body, defining a circular path of cut of substantially the same diameter as the lower end of said shirttail portions, said legs having radially outwardly facing upper portions on said body entirely above said cutters and above the bottoms of said shirttail portions, and hard metal stabilizer shoes on said upper portions of said legs which extend outwardly from said legs to substantially the same diameter as said circular path of cut.

Claim 3

The structure of claim 1, and said legs being integral with the remainder of said body portion, the legs having integral cutter journals thereon having longitudinal axes, and said stabilizer shoes being integral with said drill body portion.

Claim 4

The structure in claim 2, and said cutter journals being directed downwardly and inwardly from the lower ends of said legs, said lower ends of said legs having surfaces of revolution about the bases of said journals and concentric to the longitudinal axes of the journals, and defining, with the outer walls of said legs, relatively thin tapering leg ends, and said stabilizer shoes being in vertical alignment with said relatively thin tapering leg ends.

Claim 5

A well-drilling tool for use on the lower end of a drilling string wherein the tool comprises a drill bodY having a central axis of rotation and having rotatable cutter means thereon, wherein the body comprises an upper section having legs extending downwardly therefrom at spaced points about said axis of rotation, those parts of the drill body above the legs, and radially outwardly facing portions of the drill body between said legs, being of less diameter than a diameter defined by the upper portions of said legs, the legs have radially outwardly disposed faces slanting outwardly from upper to lower portions thereof, the lower portions of said legs comprising the outer diameter surfaces of said tool rotatable cutters being supported by said legs, the cutter, when the drill body is rotated, defining a circular path having a diameter substantially coincident with a circular path defined by the lower portions of said legs, the upper portions of the legs having stabilizer pads of hard facing material thereon and extending outwardly therefrom, said pads having radially outwardly disposed faces on a circular path whose diameter is approximately the same as that of the circular path described by the lower portions of said legs.

Claim 6

A well-drilling tool for use on the lower end of a drilling string wherein the tool comprises a drill bodY having a central axis of rotation and having rotatable cutter means thereon, wherein the body comprises an upper section having legs extending downwardly therefrom at spaced points about said axis of rotation, those parts of the drill body above the legs, and radially outwardly facing portions of the drill body between said legs, being of less diameter than a diameter defined by the upper portions of said legs, the legs have radially outwardly disposed faces slanting outwardly from upper to lower portions thereof, the lower portions of said legs comprising the outer diameter surfaces of said tool rotatable cutters being supported by said legs, the cutter, when the drill body is rotated, defining a circular path having a diameter substantially coincident with a circular path defined by the lower portions of said legs, the upper portions of the legs having stabilizer pads of hard facing material thereon and extending outwardly therefrom, said pads having radially outwardly disposed faces on a circular path whose diameter is approximately the same as that of the circular path described by the lower portions of said legs.