Drill bit cutting structure and methods to maximize depth-of-cut for weight on bit applied

摘要

A drill bit for drilling a borehole in earthen formations comprises a bit body including a cone region, a shoulder region, and a gage region. In addition the bit comprises a first primary blade and a second primary blade. Further, the bit comprises a plurality of primary cutter elements mounted to the first primary blade in different radial positions. Still further, the bit comprises a plurality of primary cutter elements mounted to the second primary blade in different radial positions. Moreover, a first primary cutter element of the plurality of primary cutter elements on the first primary blade and a first primary cutter element of the plurality of primary cutter elements on the second primary blade are each positioned in the cone region and are redundant. The shoulder region has a total cutter redundancy percentage that is less than a total cutter redundancy percentage in the cone region.

主权项

1. A drill bit for drilling a borehole in earthen formations, the bit comprising:
a bit body having a bit axis and a bit face including a cone region, a shoulder region, and a gage region; a first primary blade extending radially along the bit face from the cone region to the gage region; a plurality of primary cutter elements mounted to the first primary blade, each primary cutter element on the first primary blade being mounted in a different radial position; a second primary blade extending radially along the bit face from the cone region to the gage region; a plurality of primary cutter elements mounted to the second primary blade, each primary cutter element on the second primary blade being mounted in a different radial position; wherein a first primary cutter element of the plurality of primary cutter elements on the first primary blade and a first primary cutter element of the plurality of primary cutter elements on the second primary blade are each positioned in the cone region; wherein the first primary cutter element on the first primary blade is redundant with the first primary cutter element on the second primary blade; wherein the cone region has a total cutter redundancy percentage; and wherein the shoulder region has a total cutter redundancy percentage that is less than the total cutter redundancy percentage in the cone region.