| 摘要 |
A conductor casing device for establishing and lining a wellbore in unconsolidated sediments, the conductor casing being arranged to be driven into and to displace the unconsolidated sediments by axially directed impulses against an internal abutment in the lower portion of the conductor casing, where the conductor casing is telescopic. The invention also comprises a method of driving a telescopic conductor casing into unconsolidated sediments.
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