Patent ID: 7207603
Filing Date: 2007-04-24
Classification: E21B,F16L

Abstract:
1. An insulated tubular assembly comprising: a plurality of consecutively joined tubing segments, each tubing segment comprising: (a) two opposing ends; (b) an inner tube defining an inner passage adapted for conveying fluids; (c) an outer tube concentrically disposed about and defining an annulus with said inner tube; (d) an annular bridge at each opposing end, each annular bridge connecting said inner tube with said outer tube; (e) a box member having an external cylindrical surface and an internal female thread formed on said extension of said first tubing segment; and (f) a pin member having an external male thread formed on said second tubing segment for threadably engaging said female thread of said box member to form a threaded joint between said first and second tubing segments; and an insulating sleeve in surrounding relationship to said box member, said insulating sleeve having a substantially uniform wall thickness from its upper end to its lower end, and having a substantially cylindrical inner surface exterior of said box member from said upper end to said lower end.