Straight-joint type insulated tubing and processing technology thereof
A heat-insulated oil pipe and processing technology, which is applied in the direction of heat-insulated protection pipes, drill pipes, casings, etc., can solve the problems of poor heat insulation performance at joints, jamming of lower tools, large outer diameter of couplings, and steam flow resistance Large and other problems, to achieve the effect of improving thermal insulation performance, firm and reliable connection, and reducing heat loss
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[0018] The direct-connection heat-insulated oil pipe and its processing technology provided by the present invention will be described in detail below with reference to the accompanying drawings.
[0019] The direct-connected heat-insulating oil pipe includes an outer pipe 3 and an inner pipe 4, and an inner heat-insulating layer 6 is arranged between the outer pipe 3 and the inner pipe 4. One end is provided with an internal thread 1, and the other end is provided with an external thread, and an outer heat insulation layer 2 is set at the junction of the inner pipe 4. The outer heat insulating layer 2 is a cylindrical body, and its outer diameter matches the outer diameter of the outer pipe 3 . The inner pipe 4 is longer than the outer pipe 3, and the outer pipe 3 is welded to the near junction of the inner pipe 4, and the outer pipe 3 is provided with an air extraction hole 5. After the inner pipe 4 is connected with the inner pipe 4, their inner diameters are equal, so tha...
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