Tubular drill string member with contoured circumferential surface

Patent · Tue Aug 14 04:00:00 EDT 1984

OSTI ID:6261596

Fitch, J L

A tubular member for a drill string used in the rotary drilling of deviated boreholes, which includes an outer circumferential surface which is contoured and adapted to engage the wall of the borehole so as to produce a longitudinally downward force on the drill bit upon rotation of the drill string. The tubular member may be a drill collar or section of drill pipe, wherein the contoured surface is constituted of a helical thread of a pitch which will impart a longitudinal force towards the drill bit upon rotation of the tubular member.

• Assignee: Mobil Oil Corp.
• Patent Number(s): US 4465146
• OSTI ID: 6261596
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
42 ENGINEERING
420206 -- Engineering-- Mining & Drilling Equipment & Facilities-- (1980-1989)
DEPOSITION
DESIGN
DRILL BITS
DRILL PIPES
DRILLING
DRILLING EQUIPMENT
DRILLING FLUIDS
EQUIPMENT
FLUIDS
FRICTION
INCIDENCE ANGLE
MOTION
PIPES
ROTARY DRILLING
ROTATION
SURFACE COATING
TUBES