Multilevel force balanced downhole drilling tool

摘要

Various downhole drilling tools designed and manufactured at least in part on evaluating respective forces acting on respective groups and sets of cutting elements during simulated engagement with the downhole end of a wellbore and drilling from a first downhole formation into a second downhole formation. Simulating forces acting on each cutting element as the cutting element contacts a downhole formation may be used to force balance downhole drilling tools during transition drilling or non-uniform downhole drilling conditions. Multilevel force balanced downhole drilling tools may be designed using five respective simulations, cutter group level, neighbor cutter group level, cutter set level, group of N (N=3 or N=4) consecutive cutters level and all cutters level. Various cutter layout procedures and algorithms may also be used to design multilevel force balanced downhole drilling tools which may drill faster with higher lateral stability, especially during downhole transiting drilling conditions.

主权项

1. A downhole drilling tool, comprising:
a bit body with a rotational axis extending through the bit body; a plurality of blades on exterior portions of the bit body; and a plurality of cutting elements disposed on each of the plurality of blades, the plurality of blades and the plurality of cutting elements cooperating with each other to form a cutting face profile including a plurality of neighbor cutting elements having groups of three or four neighbor cutting elements, wherein the downhole drilling tool is level four force balanced such that forces acting on each group of three or four neighbor cutting elements of the plurality of neighbor cutting elements on the cutting face profile during a drilling operation are balanced.