Extended reach drilling method

Patent · Tue Feb 14 04:00:00 EST 1984

OSTI ID:7083469

Dellinger, T B; Gravley, W

This specification discloses a rotary drilling technique for drilling a highly deviated wellbore into the earth's crust wherein a drill string comprised of drill collars and drill pipe is used to advance a drill bit attached to the drill pipe at the lower end of the drill string into the earth and form the wellbore. A first portion of the wellbore is formed to extend into the earth's crust and thereafter a highly deviated second portion of the wellbore is formed by drilling with the drill string arranged to have the drill collars located in the first portion of the wellbore and to apply compressive force on the drill pipe that extends therebelow and thus on the drill bit attached to the lower end thereof to apply the desired weight-on-bit for effective drilling of the second portion of the wellbore.

• Assignee: Mobil Oil Corporation
• Patent Number(s): US 4431068
• OSTI ID: 7083469
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
BOREHOLES
CAVITIES
DIRECTIONAL DRILLING
DRILL BITS
DRILL PIPES
DRILLING
DRILLING EQUIPMENT
DRILLS
EQUIPMENT
NATURAL GAS WELLS
OIL WELLS
PIPES
ROTARY DRILLING
ROTARY DRILLS
WELL DRILLING
WELLS