Boring or penetrating the earth – Processes – Boring with specific fluid
Reexamination Certificate
2011-08-09
2011-08-09
Bates, Zakiya W (Department: 3676)
Boring or penetrating the earth
Processes
Boring with specific fluid
C175S066000, C175S206000
Reexamination Certificate
active
07992655
ABSTRACT:
Controlling drilling mud density in drilling operations utilizing concentric drill tubes and at least two different density fluids. The mud required at the wellhead is combined with a base fluid of a different density to produce diluted mud in a riser. By combining the appropriate quantities of drilling mud with base fluid, greater control over the pressure in the wellbore and various risers can be achieved. Concentric drill tubes or risers are disclosed, wherein a first annulus defined within one riser is utilized to carry one fluid to the wellbore injection point, while a second annulus defined within another riser is utilized to carry a combination fluid and cuttings back to the drilling rig. In one embodiment with three concentric drill tubes, a third annulus is also define, wherein the various annuli can be utilized in various combinations to deliver at least two different fluids to the wellbore and return a combination fluid from the wellbore. Blowout preventers may also be used in combination with the process to control these pressures.
REFERENCES:
patent: 3603409 (1971-09-01), Watkins
patent: 3766997 (1973-10-01), Heilhecker et al.
patent: 3795361 (1974-03-01), Lee
patent: 3964557 (1976-06-01), Juvkam-Wold
patent: 4040264 (1977-08-01), Neilon
patent: 4099583 (1978-07-01), Maus
patent: 4245777 (1981-01-01), Lavanchy
patent: 4291772 (1981-09-01), Beynet
patent: 5586609 (1996-12-01), Schuh
patent: 5873420 (1999-02-01), Gearhart
patent: 6036870 (2000-03-01), Briant et al.
patent: 6152246 (2000-11-01), King
patent: 6179071 (2001-01-01), Dietzen
patent: 6230824 (2001-05-01), Peterman et al.
patent: 6273193 (2001-08-01), Hermann et al.
patent: 6415877 (2002-07-01), Fincher et al.
patent: 6450262 (2002-09-01), Regan
patent: 6536540 (2003-03-01), de Boer
patent: 6802379 (2004-10-01), Dawson et al.
patent: 6843331 (2005-01-01), de Boer
patent: 6926101 (2005-08-01), deBoer
patent: 6966392 (2005-11-01), deBoer
patent: 7270185 (2007-09-01), Fontana et al.
IADC/SPE 1996 Drilling Conference Abstract Reporting Form/ 1 Page.
Casing-while Drilling: The Next Step Change in Well Construction, World Oil, Oct. 1999.
Bates Zakiya W
Ditrani Angela M
Dual Gradient Systems, LLC
Haynes and Boone LLP
LandOfFree
Dual gradient drilling method and apparatus with multiple... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Dual gradient drilling method and apparatus with multiple..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dual gradient drilling method and apparatus with multiple... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2664077