| 摘要 |
The invention concerns a method for enhancing resistance to external pressure to a pipe installed in a previously cased borehole, which offers a passage through its opening of reduced size. Said method consists in lowering the pipe in a first shape (2) whereof the dimensions are smaller than the reduced opening, in deforming it to convert it from the first shape in a second shape substantially cylindrical (3) having a dimension larger than the reduced opening and characterized by the expansion of the cylindrical pipe of the second form by displacement of an expansion mandrel through the pipe, the peripheral expansion lying between 2 and 10% of the value of the initial perimeter.
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