DRILCO Nonmagnetic HeviWate Transition （DRILCO非磁性HeviWate过渡）.pdf

DRILCO Nonmagnetic Hevi-Wate Transition Drillpipe ApplicAtions The low magnetic permeability of DRILCO nonmagnetic (NM) ■ Provides intermediate weight on bit Hevi-Wate* transition drillpipe enables it to isolate MWD tools from the (WOB) while isolating MWD tools from undesirable effects of drillstring magnetic interference. This interme- drillstring magnetic interference diate-weight drillstring member is manufactured to specifications more stringent than API specifications. It has corresponding drillpipe dimen- Benefits sions and can be picked up with the drillpipe elevators for fast, efficient ■ Greater directional survey accuracy with handling on the rig floor. reduced drillstring magnetic interference reduced drag and extended service life ■ Improved drilling efficiency and direc- A unique center upset or wear pad keeps the tube away from the tional control with reduced torque and borehole wall (for Types I and II NM Hevi-Wate drillpipe), increasing drag versus drill collars tube life while reducing hole drag and differential sticking problems. The ■ Shorter trip time with easier handling API bore back box feature is standard for the box connection on 4-in than drill collars DRILCO Hevi-Wate drillpipe and larger, helping to extend the service life of the connection. In addition, cold-rolling the thread roots on the ■ Reduced risk of differential sticking