Dynamically positioned, concentric riser, drilling method and apparatus
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United States of America Patent
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Aug 14, 2001
Grant Date -
N/A
app pub date -
Dec 16, 1998
filing date -
Dec 16, 1997
priority date (Note) -
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Abstract
A dynamically positioned, concentric riser, drilling system comprising a dynamically positioned drilling unit operable to float at least partially above the surface of a body of water, a first, outer, low-pressure, marine riser extending from the drilling unit into the body of water, a tensioning system to support the first marine riser, a second, inner, high-pressure, marine riser concentrically extending within the first, outer, low-pressure, marine riser, a surface blowout preventor, a lower marine riser package, a subsea blowout preventor, and a connector at the base of the lower marine riser package to release the risers from the wellhead in the event of a loss of station of the drilling unit.
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