초록 ▼

A system and method provides a barrier between two different fluid densities in a riser while drilling in deepwater. An internal housing and a rotating control head are positioned in a first housing when a blowout preventer is in the sealed position. When the blowout preventer is in the sealed posit

A system and method provides a barrier between two different fluid densities in a riser while drilling in deepwater. An internal housing and a rotating control head are positioned in a first housing when a blowout preventer is in the sealed position. When the blowout preventer is in the sealed position about the internal housing, a pipe can be rotated for drilling with the pressure of the fluid in the open borehole at one density and the fluid above the seal at another density. When the blowout preventer seal is in the open position, the threadedly connected bearing assembly and internal housing can be removed relatively quickly from the riser.

대표청구항 ▼

1. A system adapted for forming a borehole using a rotatable pipe and a fluid, the system comprising:an upper tubular disposed above the borehole; a bearing assembly having an inner member and an outer member and being positioned within said upper tubular, said inner member rotatable relative to sai

1. A system adapted for forming a borehole using a rotatable pipe and a fluid, the system comprising:an upper tubular disposed above the borehole; a bearing assembly having an inner member and an outer member and being positioned within said upper tubular, said inner member rotatable relative to said outer member and having a passage through which the rotatable pipe may extend; a bearing assembly seal to sealably engage the rotatable pipe with said bearing assembly; and a holding member for positioning said bearing assembly within said upper tubular.