..., the reason being that any contact between tool joints reduces the bending stress in the pipe at the tool joint. 363 trajectory design 30-ft interval drill pipe experiment drillstring design Upstream Oil & Gas drilling rate severity well planning dogleg severity long dogleg steel drill pipe...

.... Copyright has expired. drillstring design trajectory design long dogleg drilling operation hole curvature clearance drill pipe selection fatigue failure diameter drill collar tool joint inclination dogleg well planning Upstream Oil & Gas fatigue curve Dogleg Angle compression...