Pre-sressed insulated tubing
AssigneeGeneral Machinery Plant of Liaohe Petroleum Exploration Bureau of CNPC
InventorsYaoqing Pan, Yongning Wu, Jinli Zhu, Xiaohui Zhang, Wei Zhang, Zhenyu Xu, Zhenyu Jia, Ji Chen, Yi Wang
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Abstract
The present invention relates to a pre-stressed insulated tubing, including an inner tube (3) and an outer tube (2) nested outside of the inner tube (3), and a closed ring cavity is formed between the inner tube (3) and the outer tube (2), wherein an insulated casing (4) is arranged in the closed ring cavity. The pre-stressed insulated tubing of the present invention features high vacuum degree, high thermal insulation level and long working life, and the insulated casing is reusable for cost saving.
Claims11
A pre-stressed insulated tubing, comprising an inner tube and an outer tube nested outside the inner tube, a closed ring cavity formed between the inner tube and the outer tube, and an insulated casing is arranged in the closed ring cavity,
- wherein the insulated casing includes a plurality of pieces of single casing in which one piece of the single casing is plugged into another sequentially, the pieces of the single casing are identical in size, one end of each piece of the single casing is provided with a plugging header and the other end of each piece of the single casing is provided with a plugging socket, and the plugging header on any piece of the single casing matches with the plugging socket on another piece of the single casing in shape, and
- wherein in the plurality of pieces of the single casing, one piece of the single casing is plugged into another to form a whole.
Dependencies are inferred from the claim text.