Boring or penetrating the earth – Processes – Boring with specific fluid
Reexamination Certificate
2005-01-18
2005-01-18
Walker, Zakiya (Department: 3672)
Boring or penetrating the earth
Processes
Boring with specific fluid
C175S007000, C175S066000, C175S071000, C175S217000
Reexamination Certificate
active
06843331
ABSTRACT:
A method and apparatus for controlling drilling mud density at a location either at the seabed (or just above the seabed) or alternatively below 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. A wellhead injection device for attachment to the wellhead is used for injecting the base fluid into the rising drilling mud at a location below the seabed. The riser charging lines are used to carry the low density base fluid to the injection device for injection into the drilling mud below 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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IADC/SPE 1996 Drilling Conference Abstract Reporting Form/ 1 Page.
Jackson Walker L.L.P.
Tidwell, Esq. Mark A.
Walker Zakiya
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