| 摘要 |
An apparatus and method for expanding a lower string of casing into friction al contact with an upper string of casing, and thereby hanging the lower string of casi ng onto the upper string of casing is provided. The apparatus substantially defines a lower string of casing having a scribe placed into the top end thereof. The lower string of casing is run into the wellbore, and positioned so that the top end overlaps with the bott om end of an upper string of casing already cemented into the wellbore. The top end of th e lower casing string is expanded below the depth of the scribe into frictional contact with the upper string of casing. At the same time, or shortly thereafter, the top end of the upper string of casing is expanded. As the portion of the lower casing string havi ng the scribe is expanded, the casing severs into upper and lower portions.
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