Insulated wellbore casing

Patent · Tue Sep 15 04:00:00 EDT 1987

OSTI ID:6009569

Stephenson, E O; Howe, R C

This patent describes an insulated wellbore casing adapted to be cemented to the surrounding earth of a wellbore. It consists of: an outer tubular member adapted to be cemented to the surrounding earth of the wellbore; an inner tubular member, concentrically spaced from the outer tubular member, having terminal ends substantially adjacent the outer tubular member and providing an insulating annular cavity therebetween; insulation material filling the annular cavity between the inner and outer tubulars; and weldments that join the outer and inner tubular members with the insulation held therebetween. The weldments joined while the inner tubular member is tensioned. An integrated casing unit is formed that is prestressed to accommodate linear thermal expansion of the inner tubular member at well-operating temperatures.

• Assignee: Kawasaki Thermal Systems, Inc., Tacoma, WA
• Patent Number(s): US 4693313
• OSTI ID: 6009569
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420206* -- Engineering-- Mining & Drilling Equipment & Facilities-- (1980-1989)
422000 -- Engineering-- Mining & Underground Engineering-- (1980-)
CAVITIES
CEMENTING
DESIGN
EXPANSION
JOINTS
RESERVOIR TEMPERATURE
THERMAL EXPANSION
THERMAL INSULATION
WELDED JOINTS
WELL CASINGS
WELL COMPLETION
WELL TEMPERATURE