Directional drilling azimuth control system

Patent · Tue Sep 23 04:00:00 EDT 1986

OSTI ID:5159276

Cheek, A E

A downhole anchor assembly is described for absorbing reaction torque from a downhole mud motor in a directional drill string so as to minimize azimuthal deviation from such reaction torque, the anchor assembly comprising: an elongated, generally cylindrical housing having upper and lower ends with tool joints thereon for coupling the body into a directional drill string and having a drilling fluid passage extending longitudinally through its length; at least one elongated chain support body longitudinally mounted in the housing; an elongated, endless anchor chain supported on the body, the chain having an elongated portion thereof longitudinally arranged and generally radially exposed externally of the body, the exposed chain portion being freely longitudinally movable along the body; the body being generally radially shiftable between a retracted position in which the exposed chain portion is substantially recessed in the housing; and actuating means in the housing engageable with the body for shifting the body from the retracted position to its extended position.

• Assignee: NOV; NOV-85-026072; EDB-86-181293
• Patent Number(s): US 4612987
• OSTI ID: 5159276
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
AZIMUTH
CONTROL EQUIPMENT
DIRECTIONAL DRILLING
DRILL PIPES
DRILLING
DRILLING EQUIPMENT
DRILLING FLUIDS
EQUIPMENT
FLUIDS
INCIDENCE ANGLE
JOINTS
MOTORS
NATURAL GAS WELLS
OIL WELLS
PIPE JOINTS
PIPES
POSITIONING
TORQUE
WELLS