Dual-gradient drilling was first attempted in 2001, but it was not aggressively pursued due to "the enormous cost associated with the demonstration prototype model," according to a 2011 report on ...

HOUSTON, May 4 -- As others prepare to field test subsea pumps for dual gradient drilling in ultradeep water, Stewart & Stevenson Service Inc.'s Petroleum Equipment Division in Houston has ...

Designed to cut large-diameter holes in thick metal more easily and more efficiently than twist drills or hole saws, annular cutters are considered to be industrial-grade tools. “Twist drills ...

The dual-tube flooded reverse-circulation drilling technique, which allowed the extraordinary bit to penetrate loss circulation zones that precluded the use of a more traditional raised bore rig.

Vermeer's D40x55DR S3 Navigator horizontal directional drill features dual rod technology using an inner rod to provide torque to the drill bit and an outer rod for steering capability and ...

Statoil has extensive experience in both dual-diameter pigging of subsea pipelines and the environmental ramifications of pipeline commissioning. This second article in a two-part series discusses ...