Dual-wall drill pipe

Patent · Tue Jan 21 00:00:00 EST 1986

OSTI ID:5855462

Becker, F W

This patent describes a dual-wall drill pipe section for a drill string. It is formed from a plurality of serially connected drill pipe sections, for use in drilling in earth formations. The drill pipe section consists of: an outer pipe having an internally threaded box end, an externally threaded pin end, internal shoulder means extending inwardly from the bore of the outer pipe and recess means formed in the bore; an inner pipe adapted to be concentrically disposed within and telescopingly movable inwardly and outwardly of the outer pipe, external shoulder means extending outwardly of the outer periphery of the inner pipe and being engageable with the internal shoulder means for axially locating the inner pipe within the outer pipe and for supporting the inner pipe in the outer pipe when the section is in an upright position; detent means associated with the inner and outer pipe for releasably retaining the inner pipe within the outer pipe and permitting relative axial displacement of the pipe upon application of predetermined opposed axial forces to the pipe, the detent means including a plurality of generally v-shaped leaf springs, an end of one arm of each spring being secured to the outer periphery of the inner pipe, the end of the other arm of each spring being abuttingly and slidingly engageable with the outer periphery of the inner pipe and the apex of each spring means being spaced from the periphery and frictionally engageable with the recess means; and spacer means secured to each end of the periphery of the inner pipe and being abuttingly engageable with the bore of the outer pipe for maintaining concentricity between the inner and outer pipes; the spacer means including a plurality of angularly spaced longitudinally extending plates extending outwardly from the periphery and each having a longitudinal surface abuttingly engageable with the bore of the outer pipe.

• Assignee: NOV; EDB-86-085023
• Patent Number(s): US 4565394
• OSTI ID: 5855462
• Resource Relation: Patent File Date: Filed date 10 Sep 1982
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
42 ENGINEERING
DRILL PIPES
DESIGN
WELL DRILLING
DRILL BITS
NATURAL GAS WELLS
OIL WELLS
SPACE DEPENDENCE
SPACERS
SUPPORTS
THREADED JOINTS
DRILLING
DRILLING EQUIPMENT
EQUIPMENT
JOINTS
MECHANICAL STRUCTURES
PIPES
WELLS
020300* - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing
420206 - Engineering- Mining & Drilling Equipment & Facilities- (1980-1989)