公开(公告)号：US09810028B2

公开(公告)日：2017-11-07

申请号：US14605445

申请日：2015-01-26

申请人： NABORS DRILLING TECHNOLOGIES USA, INC.

发明人： Vadim Minosyan ,  Peter Harvey

IPC分类号： E21B17/00 ,  E21B17/02 ,  E21B17/042 ,  E21B47/12

CPC分类号： E21B17/003 ,  E21B17/028 ,  E21B17/042 ,  E21B47/122

摘要： An improved gap sub assembly that can withstand the rigors of directional drilling, while still being cost effective and easy to deploy at the drill site. Embodiments can be assembled by sliding a mandrel into a housing without any threading or clocking, filling the gap between the housing and mandrel with an electrically isolating material, and curing the electrically isolating material to mechanically couple the housing and mandrel. In some embodiments, the interior surface of the housing and the outer surface of the mandrel comprise a plurality of complimentary axial sections having staggered diameters so that a constant dielectric gap is maintained. In some embodiments, the interior surface of the housing and the outer surface of the mandrel comprise non-overlapping right- and/or left-handed helical grooves that, when filled with a cured electrically insulating material, forms a complex 3D shear resistance mechanism optimized to resist torsion or twisting.