Drill string splined resilient tubular telescopic joint for balanced load drilling of deep holes

Patent · Tue Mar 06 00:00:00 EST 1984

OSTI ID:6489965

Garrett, W R

A drill string splined resilient tubular telescopic joint for balanced load deep well drilling comprises a double acting damper having a very low spring rate upon both extension and contraction from the zero deflection condition. Stacks of spring rings are employed for the spring means, the rings being either shaped elastomer-metal sandwiches or, preferably, roller Belleville springs. The spline and spring means are disposed in an annular chamber formed by mandrel and barrel members constituting the telescopic joint. The chamber containing the spring means, and also containing the spline means, is filled with lubricant, the chamber being sealed with a pressure seal at its lower end and an inverted floating seal at its upper end. A prototype includes of this a bellows seal instead of the floating seal at the upper end of the tool, and a bellows in the side of the lubricant chamber provides volume compensation. A second lubricant chamber is provided below the pressure seal, the lower end of the second chamber being closed by a bellows seal and a further bellows in the side of the second chamber providing volume compensation. Modifications provide hydraulic jars.

• Assignee: Smith International Inc.
• Patent Number(s): US 4434863
• OSTI ID: 6489965
• Resource Relation: Patent File Date: Filed date 16 Dec 1980; Other Information: PAT-APPL-216832
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
DRILL BITS
SHOCK ABSORBERS
DRILL PIPES
DESIGN
EXPANSION JOINTS
BELLOWS
DAMPING
LOADING
LUBRICANTS
SEALS
SPRINGS
DRILLING EQUIPMENT
EQUIPMENT
JOINTS
MACHINE PARTS
MATERIALS HANDLING
MECHANICAL STRUCTURES
PIPES
420206* - Engineering- Mining & Drilling Equipment & Facilities- (1980-1989)