Method and apparatus for varying the density of drilling fluids in deep water oil drilling applications
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United States of America Patent
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Mar 25, 2003
Grant Date -
Aug 15, 2002
app pub date -
Feb 15, 2001
filing date -
Feb 15, 2001
priority date (Note) -
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Abstract
A method and apparatus for controlling drilling mud density at or near the seabed of wells in deep water and ultra deep-water applications combines a base fluid of lesser density than the mud required at the wellhead to produce a diluted mud in the riser. By combining the appropriate quantities of drilling mud with base fluid, a riser mud density at or near the density of seawater may be achieved. No additional hardware is required below the surface. The riser charging lines are used to inject the low-density base fluid at or near the BOP stack on the seabed. The cuttings are brought to the surface with the diluted mud and separated in the usual manner. The diluted mud is then passed through a centrifuge system to separate the heavier drilling mud from the lighter base fluid.
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