Inventor
WORRALL ROBERT N
NL8 patents
Patents
8 patentsUS4784223ANov 15, 1988
Forming an impermeable coating on a borehole wall
SHELL OIL CO154 citations98
US5348095ASep 20, 1994
Method of creating a wellbore in an underground formation
SHELL OIL CO537 citations95
US4890682AJan 2, 1990
Apparatus for vibrating a pipe string in a borehole
SHELL OIL CO139 citations95
US4836301AJun 6, 1989
Method and apparatus for directional drilling
SHELL OIL CO77 citations93
US5168932ADec 8, 1992
Detecting outflow or inflow of fluid in a wellbore
SHELL OIL CO75 citations92
US5117926AJun 2, 1992
Method and system for controlling vibrations in borehole equipment
SHELL OIL CO59 citations89
US4880066ANov 14, 1989
Assembly for directional drilling of boreholes
SHELL OIL CO51 citations86
US5225638AJul 6, 1993
Hydrogen-oxygen acoustic logging device
SHELL OIL CO7 citations63