| 摘要 |
A method is provided for supporting and sealing structure defining a generally cylindrical hole while introducing and removing devices from the hole. A first flexible liner is installed in the hole and pressurized to a pressure effective to support and seal the structure. A second flexible liner is everted between the first flexible liner and the structure, where the second flexible liner carries the devices to introduce and remove the devices from the hole while the first liner remain pressurized to continuously support and seal the structure.
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