| 摘要 |
The present disclosure sets forth the method and apparatus for installing a casing in a geothermal well. Procedurally, the well is drilled toward but not into the geothermal zone of interest, a surface conductor pipe is cemented in place, a casing sting is then positioned in the well borehole and the bottom portions thereof is cemented in place, tension is then placed in the casing string, and the top end is anchored. With tension in the casing string, wellhead completion steps are carried out and production upwardly the casing string causes the casing string to elongate and thereby reduces the tension in the casing string. An apparatus is disclosed including an external spool having an outer groove which is locked in position with a set of lock pins. The spool has a set of slips of wedge shaped construction on the interior which grip the casing when subjected to hydraulic pressure. This enables the casing string to be held firmly without slipping at the wellhead.
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