Method and apparatus for horizontal drilling
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United States of America Patent
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Sep 22, 1992
Issued Date -
N/A
app pub date -
Sep 24, 1991
filing date -
Jun 21, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention comprises a method and apparatus for simultaneously drilling and casing a wellbore. More specifically, the apparatus comprises an outer conduit string containing an inner drill string carrying a bit capable of drilling a wellbore of greater diameter than the outer string. The drill string may be adapted to drill a nonlinear wellbore by offsetting the drill bit from the longitudinal axis of the outer string, and the drill bit is preferably retractable to permit withdrawal of the drill string after the wellbore is completed, leaving the outer string of casing or liner in place. The wellbore is drilled by rotating the drill bit and advancing the drill string by pushing from the surface, and the outer string is advanced by being pulled along by the drill string.
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