Inventor

SMITH DAVID GEORGE LIVESEY

NL2 patents

Patents

2 patents

US7207398B2Apr 24, 2007

Steerable rotary drill bit assembly with pilot bit

SHELL OIL CO59 citations95

US7281592B2Oct 16, 2007

Injecting a fluid into a borehole ahead of the bit

SHELL OIL CO52 citations90