Apparatus for optional straight or directional drilling underground formations

Patent · Tue Apr 26 04:00:00 EDT 1988

OSTI ID:7053185

Kruger, V; Panzke, R

A device for use in underground directional drilling of boreholes in which either a straight borehole may be drilled or wherein a borehole having a predetermined radius of curvature may be drilled while the device is positioned in a borehole is described comprising: a tubular housing comprising upper, intermediate and lower sections connected to one another; a down-hole motor mounted in the upper section of the housing and having an output shaft; means for connecting the output shaft to a drill bit located below the lower section of the housing; means for connecting the housing to a drill string such that the axis of the upper section is initially essentially in alignment with the axis of the drill string; and first and second stabilizers mounted on the housing. The first stabilizer is associated with the lower section of the housing and the second stabilizer is associated with the upper section of the housing. The upper section has a longitudinal axis and the lower section has a longitudinal axis which is arranged at an angle relative to the axis of the upper section; and the intermediate section has a longitudinal axis which intersects the upper and lower axes.

• Assignee: Eastman Christensen Co., Salt Lake City, UT
• Patent Number(s): US 4739842
• OSTI ID: 7053185
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
DESIGN
DIRECTIONAL DRILLING
DRILL BITS
DRILL PIPES
DRILLING
DRILLING EQUIPMENT
DRILLS
ELECTRIC MOTORS
EQUIPMENT
MACHINE PARTS
MOTORS
NATURAL GAS WELLS
OIL WELLS
PIPES
ROCK DRILLING
SHAFTS
WELLS