| 摘要 |
Casing segments (28, 26) and an expansion cone (70) are positioned and cemented within a new section of a wellbore (24) with a lower casing segment (26) in an overlapping relationship with an upper casing segment (28). The lower casing segment (26) is radially expanded such that an upper end of the lower casing segment comes into contact with the interior wall of the upper casing segment (28) at the overlap region (32). The upper casing segment (28) has an inward facing profile at the overlap region that includes a set of wickers (40) that are driven into the lower casing exterior when it is expanded. This forms a metal-to-metal seal between the upper and lower casing segments (28, 26) at the overlap region (32).Figure 2.
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