ROTARY DRILL BITS WITH BACK-UP CUTIING ELEMENTS TO OPTIMIZE BIT LIFE
摘要
<p>A multi-layer downhole drilling tool designed for drilling a wellbore including a plurality of formations is disclosed. The drilling tool includes a bit body including a rotational axis extending therethrough. A plurality of blades are disposed on exterior portions of the bit body. A plurality of primary cutting elements and a plurality of back-up cutting elements are disposed on exterior portions of the plurality of blades. The back-up cutting elements are track set with corresponding primary cutting elements, and each back-up cutting element is disposed on a different blade than the corresponding primary cutting element.</p>
申请公布号
EP2872723(A1)
申请公布日期
2015.05.20
申请号
EP20120880858
申请日期
2012.09.05
申请人
HALLIBURTON ENERGY SERVICES, INC.
发明人
CHEN, SHILIN;LEFORT, GUY;ARFELE, ROBERT W.;ASHBY, JAMES R.