System and method for controlled directional drilling

Patent · Tue May 26 04:00:00 EDT 1987

OSTI ID:6433362

Greczy, B; De Lucia, F

An improved system is described for controlled directional and straight drilling of a borehole wherein the entire drillstring is rotatable from the surface, including a bottomhole assembly comprised of a drill bit connected to the output shaft of a downhole motor for independent rotation from the drillstring. The motor is connected at its uphole end to the drillstring. The improvement in the bottomhole assembly comprises: a first, concentric stabilizer, having a preselected diameter slightly smaller than the diameter of the borehole, mounted between the drill bit and motor at a preselected distance from the bit around the output shaft of the downhole motor. The shaft is concentrically located. A method is described for controlled directional and straight drilling of a borehole, according to a predetermined well plan. The method utilizes a bottomhole assembly connected to a drillstring comprising a drill bit connected for independent rotation from the drillstring to the output shaft of a downhole motor having its uphole side connected to the drillstring.

• Assignee: Smith International, Inc., Newport Beach, CA
• Patent Number(s): US 4667751
• OSTI ID: 6433362
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
42 ENGINEERING
420206 -- Engineering-- Mining & Drilling Equipment & Facilities-- (1980-1989)
BOREHOLES
CAVITIES
DIRECTIONAL DRILLING
DRILL BITS
DRILL PIPES
DRILLING
DRILLING EQUIPMENT
EQUIPMENT
INCIDENCE ANGLE
MACHINE PARTS
MECHANICAL STRUCTURES
MOTION
MOTORS
NATURAL GAS WELLS
OIL WELLS
PIPES
ROTATION
SHAFTS
STABILIZATION
SUPPORTS
WELL DRILLING
WELLS