| 摘要 |
A well bore casing inserting and drilling method and apparatus comprising the simultaneous drilling and casing setting of an oil and/or gas well bore by supporting a drill bit and actuating motor therefor from the lower end of the well casing whereby the well casing is lowered into the well bore simultaneously with the penetration of the earth by the drill bit assembly, the motor and drill bit being releasably secured within a housing whereby the motor and drill bit may be retrieved through the internal bore of the casing for repair or replacement of the drill bit or other operational components of the apparatus.
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