EARTH-BORING TOOLS AND METHODS OF MAKING EARTH-BORING TOOLS INCLUDING AN IMPACT MATERIAL, AND METHODS OF DRILLING THROUGH CASING

摘要

Earth-boring tools comprise a face and a plurality of cut-ting elements disposed on at least a portion of the face. An impact materi-al is positioned on at least one portion of the body and has a relative ex-posure equal to or greater than at least some of the cutting elements of the plurality of cutting elements. The impact material comprises a material having a lower abrasion resistance than the body. Methods of making and methods of using such earth-boring tools are also disclosed.