The Webb Law Firm
Pre-sressed insulated tubing
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.
General Machinery Plant of Liaohe Petroleum Exploration Bureau of CNPC
F E F E
F16L E21B F16L E21B
inventional inventional inventional inventional
Yongning Xiaohui Zhenyu Jinli Yi Ji Yaoqing Zhenyu Wei
Wu Zhang Jia Zhu Wang Chen Pan Xu Zhang