Well drilling apparatus

Patent · Tue Mar 20 04:00:00 EST 1984

OSTI ID:6763728

Boyadjieff, G I; Picard, J A.R.

A well drilling system designed to eliminate the usual rotary table, kelly and kelly bushing, and including a drilling unit having a tubular part connectible to the upper end of the drill string and a motor for driving that tubular part rotatively, with the drilling unit being mounted by a guide structure for vertical movement, and in addition being mounted for movement transversely of the axis of the well from the normal drilling position to at least one laterally offset position. Preferably, the drilling unit is movable to two different laterally offset positions, in one of which the drilling unit is above a mousehole location to pick up or release a pipe section, and in the other of which the drilling unit is at an inactive location at which it may remain during a trip of the drill string into or out of the well.

• Assignee: Varco International, Inc.
• Patent Number(s): US 4437524
• OSTI ID: 6763728
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420206* -- Engineering-- Mining & Drilling Equipment & Facilities-- (1980-1989)
DESIGN
DIRECTIONAL DRILLING
DRILL PIPES
DRILLING
DRILLING EQUIPMENT
DRILLS
EQUIPMENT
HOISTS
MATERIALS HANDLING EQUIPMENT
MECHANICAL STRUCTURES
MOTION
MOTORS
PIPES
POSITIONING
ROTARY DRILLING
ROTARY DRILLS
ROTATION
SUPPORTS
WELL DRILLING