Insulating tubular conduit apparatus

Patent · Tue Nov 25 04:00:00 EST 1986

OSTI ID:6961829

McStravick, D M; Chenoweth, D V

This patent describes a concentric walled tubular conduit forming a tubular string in a subterranean well to transport a fluid between the surface and a subterranean producing formation in an oil well, the temperature of the fluid being greater than the surrounding temperature in the well. The conduit comprises an outer tubular member prestressed in compression and having threads on each end thereof; an inner tubular member prestressed in tension, and concentrically received within and spaced from the inner periphery of the outer tubular member; and insulating material surrounding the inner tubular member. The inner tubular member has both of its ends outwardly flared and respectively welded directly to the inner surface of the outer tubular member adjacent the threaded ends. Each end of the inner tubular member is thereby rigidly sealably secured to the adjacent ends of the outer tubular member to define a sealed cavity between the tubular members. The rigidly welded, flared ends comprise means for transmitting forces due to differential thermal expansion and contraction along the entire length of the inner and outer tubular members between the outer and inner tubular members, differential thermal expansion forces being transmitted through the flared ends and the welds. Both ends of the inner tubular conduit are respectively welded to the inner surface of the outer tubular conduit at a position intermediate the length of the threads on each end thereof.

• Assignee: Baker Oil Tools, Inc., Orange, CA
• Patent Number(s): US 4624485
• OSTI ID: 6961829
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
42 ENGINEERING
420206 -- Engineering-- Mining & Drilling Equipment & Facilities-- (1980-1989)
CONTRACTION
DRILL BITS
DRILL PIPES
DRILLING EQUIPMENT
EQUIPMENT
EXPANSION
JOINTS
OIL WELLS
PIPES
RESERVOIR TEMPERATURE
SEALS
STRAINS
STRESSES
TEMPERATURE DEPENDENCE
THERMAL EXPANSION
THERMAL INSULATION
THREADED JOINTS
WELDED JOINTS
WELL TEMPERATURE
WELLS