Device for facilitating release of stuck drill collars

Patent · Tue Mar 18 00:00:00 EST 1986

OSTI ID:5649557

Brown, R L

A device is described adapted to be incorporated into a drill string used in subterranean drilling, for normally functioning as a rigid element capable of transmitting torsional force from a portion of the drill string which is disposed above the device to the portion of the drill string which is disposed below the device, and for facilitating release of stuck portion of the drill string. The device consists of: first means for fixedly but removably mounting the device intermediately into the drill string to normally occupy a first operative position. The entire device is substantially concentric with the longitudinal axis of the drill string in the first operative position; second means incorporated into the device for placing the device into a second operative position when a greater than predetermined substantially axial force is applied to the device, in the second operative position the portion of the drill string disposed above the device being off-center relative to the portion of the drill string disposed below the device, and third means incorporated in the device to permit, in the second operative position, free rotation of the portion of the drill string disposed above the device relative to the portion of the drill string disposed below the device, whereby rotation of the portion above the device causes a camming action against walls of the borehole and a vibration, the camming action and vibration facilitating release of stuck portion of the drill string below the device.

• Assignee: DMI Wireline, Inc., Broussard, LA
• Patent Number(s): US 4576229
• OSTI ID: 5649557
• Resource Relation: Patent File Date: Filed date 20 Jul 1984
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
42 ENGINEERING
DRILL BITS
FAILURES
MECHANICAL VIBRATIONS
DRILL PIPES
WELL DRILLING
BOREHOLES
NATURAL GAS WELLS
OIL WELLS
POSITIONING
ROTATION
TORSION
CAVITIES
DRILLING
DRILLING EQUIPMENT
EQUIPMENT
MOTION
PIPES
WELLS
020300* - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing
420206 - Engineering- Mining & Drilling Equipment & Facilities- (1980-1989)