Secondary cutting structure

摘要

In one aspect, embodiments disclosed herein relate to a secondary cutting structure for use in a drilling assembly, the second cutting structure including a tubular body and a cutter block, extendable from the tubular body, the block including at least three rows of cutting elements. In another aspect, embodiments disclosed herein relate to drilling a borehole, the method including disposing a drilling tool assembly in the borehole, wherein the drilling tool assembly includes a primary cutting structure and a secondary cutting structure, and wherein the secondary cutting structure ahs a cutter block having at least three rows of cutting elements. The method also includes actuating the primary cutting structure, drilling a first portion of the borehole with the primary cutting structure, actuating the secondary cutting structure, and drilling a second portion of the borehole with both the primary and secondary cutting structures.

主权项

1. A secondary cutting structure for use in a drilling assembly, the secondary cutting structure comprising:
a tubular body; a cutter block, extendable from the tubular body, the block including at least three rows of cutting elements disposed on a downhole end of the cutter block; and a flow channel extending longitudinally between at least two of the at least three rows of cutting elements, wherein the flow channel is collinear with one of the at least three rows of cutting elements.