Earth-boring bit with wear-resistant shirttail
AssigneeBaker Hughes Incorporated
InventorsMohammed Swadi, Brian Wiesner, Greg Van Klompenburg
Life of this patent
Estimating the term…
Abstract
An earth-boring bit has a bit body that is threaded at one end for connection into a drill string. At least one cantilevered bearing shaft depends inwardly and downwardly from the bit body. A cutter is mounted for rotation on each bearing shaft and includes a plurality of cutting elements arranged in generally circumferential rows. At least one wear-resistant element is secured to the bit body between the lower end of the bit body and the threaded end, the wear-resistant element being elongate or generally oblong in cross-section.
Claims16
An earth-boring bit comprising:
- a bit body with threads at one end for attachment to a drill string, the bit body having an axis of rotation;
- at least one bearing shaft depending inwardly and downwardly from an end of the bit body generally opposite the threaded end;
- a cutter mounted for rotation on each bearing shaft;
- at least one hole formed in an exterior surface of the bit body between the lower end of the bit body and the threaded end, the hole having a sidewall that is generally oblong in a cross-section in a plane perpendicular to a depth of the hole, defining a length greater that is greater than a width, the length running generally parallel with the axis of rotation;
- and
- at least one wear resistant element, the wear resistant element mating with and secured within the hole.
An earth-boring bit comprising:
- a bit body formed of at least one bit section, the bit body being threaded at its upper end for connection to a drill string, the bit body having an axis of rotation;
- at least one bearing shaft depending inwardly and downwardly from each bit section of the bit body, each bit section having a shirttail region proximal the bearing shaft;
- a cutter mounted for rotation on each bearing shaft;
- and
- at least one wear-resistant element secured to the bit body between the shirttail and the threaded end, the wear-resistant element having a bottom and being oblong in a cross-section that is parallel to the bottom, defining two opposite rounded edges through which a long axis extends, the wear-resistant element being oriented so that its long axis is substantially parallel with the axis of rotation.
An earth-boring bit comprising:
- a bit body formed of at least one bit section, the bit body being threaded at its upper end for connection to a drill string and having a bit axis of rotation;
- at least one bearing shaft depending inwardly and downwardly from each bit section of the bit body, each bit section having a shirttail region proximal the bearing shaft;
- a cutter mounted for rotation on each bearing shaft, portions of the bit body and cutters defining a gage diameter of the bit;
- a plurality of oblong wear-resistant elements secured to the bit body between the shirttail and the threaded end, each of the oblong wear-resistant elements having an outer side projecting from the bit body by an amount less than the gage diameter of the bit;
- each of the oblong wear-resistant elements having an inner side opposite the outer side and a perimeter wall that joins the inner and outer sides, the perimeter wall fitting matingly within an oblong hole formed in the bit body;
- and
- the perimeter wall of each of the oblong wear-resistant elements being oblong with two opposite rounded ends through which a long axis which extends in a plane parallel with the inner side, each of the wear-resistant elements being oriented so that its long axis is substantially parallel to the axis of rotation.
Dependencies are inferred from the claim text.