Method and system for return of drilling fluid from a sealed marine riser to a floating drilling rig while drilling
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United States of America Patent
Stats
-
Jul 5, 2005
Grant Date -
Nov 15, 2001
app pub date -
Jul 23, 2001
filing date -
Mar 2, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A floating rig or structure for drilling in the floor of an ocean using a rotatable tubular includes a seal housing having a rotatable seal connected above a portion of a marine riser fixed to the floor of the ocean. The seal rotating with the rotating tubular allows the riser and seal housing to maintain a predetermined pressure in the system that is desirable in underbalanced drilling, gas-liquid mud systems and pressurized mud handling systems. The seal is contemplated to be either an active seal or a passive seal. A flexible conduit or hose is used to compensate for relative movement of the seal housing and the floating structure because the floating structure moves independent of the seal housing. A method for use of the system is also disclosed.
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