Straight-connection-type non-prestressed insulated tubing

• Main Authors: LU GUOCHENG, LI YOUPING, LIU MING, WANG CHAO, YANG YUZHEN, ZHAO XIAO, DAI YUTING, JIANG ZEJU
• Format: Patent
• Language: Chinese; English
• Published: 12.11.2019
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

The invention relates to insulated tubing, in particular to straight-connection-type non-prestressed insulated tubing. The straight-connection-type non-prestressed insulated tubing comprises a coupling, an inner tube, a compaction sealing system, an outer tube, an insulation layer and a welded ring; the coupling is mounted at the upper end of the inner tube, and the welded ring sleeves the lower end of the inner tube; the inner tube and the outer tube are welded together, the compaction sealing system is wound around the inner tube, and the compaction sealing system and the insulation layer are sequentially mounted between the inner tube and the outer tube from left to right; and tubing threads are arranged at the two ends of the inner tube and used for connection between the insulated tubing. According to the low-cost novel non-prestressed insulated tubing, compared with existing prestressed insulated tubing or non-prestressed insulated tubing, the inner tube and the outer tube do notneed to be subjected to