Liquid lift method for drilling risers
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United States of America Patent
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Oct 12, 2004
Grant Date -
Aug 29, 2002
app pub date -
Feb 21, 2002
filing date -
Feb 23, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
A method for drilling a well below a body of water as disclosed which includes injecting into the well, at a depth below the water surface, a liquid having a lower density than a density of a drilling mud producing a mixture of drilling mud and low-density liquid in the well. The mixture of drilling mud and low-density liquid is withdrawn from an upper end of the well. The drilling mud and the low-density liquid are separated, with at least a portion of the separated low-density liquid returned to the depth below the water surface and at least a portion of the separated drilling mud returned to an upper end of the drill string.
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