Wells – With below and above ground modification – Head for tool – piston or cleaner
Reexamination Certificate
1999-06-14
2001-03-27
Bagnell, David (Department: 3672)
Wells
With below and above ground modification
Head for tool, piston or cleaner
C166S291000, C221S263000
Reexamination Certificate
active
06206095
ABSTRACT:
FIELD OF THE INVENTION
The field of this invention relates to surface-mounted equipment which can be used for dropping articles of various sizes and shapes downhole to facilitate downhole operations.
BACKGROUND OF THE INVENTION
Many downhole operations require sequential dropping of various objects downhole to facilitate a downhole operation. The sequence may involve dropping a ball on a ball seat to close off the wellbore to allow pressure to be built up to actuate tools such as packers or hangers or downhole valves. Cementing operations typically involve dropping one or more wiper plugs in a specific order to, for example, wipe the wellbore clean of the cement. These objects to be dropped downhole are frequently assembled in surface equipment referred to as a plug-dropping head. In the past, plug-dropping heads have been stacked vertically to accommodate the sequential dropping of objects downhole. Thus, the lowermost object would be dropped first and so forth up until the topmost plug-dropping head has released the object stored therein. The problem with this arrangement is that it gets to be quite tall and in most applications, the plug-dropping heads are inaccessible. One way the prior designs have compensated for this inaccessibility problem is to actuate the plug-dropping heads by remote control. Such techniques are described in U.S. Pat. Nos. 5,435,390 and 5,590,713.
One of the objects of the present invention is to provide a compact design which can be operable to insert a plurality of objects downhole within fairly confined vertical space limits at the surface. The object of the device is to present a compact design which can efficiently deliver a series of objects downhole. Another object of the invention is to allow circulation to continue as the device operates to sequentially drop objects downhole. These and other advantages of the present invention will become more apparent to those skilled in the art from a review of the description of the preferred embodiment below.
SUMMARY OF THE INVENTION
A plug-dropping head is disclosed in which the objects to be dropped are placed in individual discrete passages. A motor-driven or hand-operated rotating member orients an entrance to a passage going through it to, in series, individual passages in the housing for sequential dropping of objects downhole. A relief port is provided so that as the rotating outlet member moves from one passage in the housing to the next, the relief passage prevents deadheading of the surface pump.
REFERENCES:
patent: 2713909 (1955-07-01), Baker
patent: 3396789 (1968-08-01), Dean
patent: 3403729 (1968-10-01), Hicky
patent: 3785525 (1974-01-01), Handeland
patent: 4317486 (1982-03-01), Harris
patent: 4354278 (1982-10-01), Clark et al.
patent: 4427065 (1984-01-01), Watson
patent: 4468762 (1984-08-01), Jurgens
patent: 4671353 (1987-06-01), Daming
patent: 4721158 (1988-01-01), Merritt, Jr. et al.
patent: 4767280 (1988-08-01), Markuson et al.
patent: 4782894 (1988-11-01), LaFleur
patent: 4785880 (1988-11-01), Ashton
patent: 4854383 (1989-08-01), Arnold et al.
patent: 4924482 (1990-05-01), Shimizu et al.
patent: 5033113 (1991-07-01), Wang
patent: 5040603 (1991-08-01), Baldridge
patent: 5095988 (1992-03-01), Bode
patent: 5142534 (1992-08-01), Simpson et al.
patent: 5188178 (1993-02-01), Noyes
patent: 5191937 (1993-03-01), Cook, Sr.
patent: 5279305 (1994-01-01), Zimmerman et al.
patent: 5293933 (1994-03-01), Brisco
patent: 5383044 (1995-01-01), Borchardt et al.
patent: 5435390 (1995-07-01), Baugh et al.
patent: 5590713 (1997-01-01), Baugh et al.
patent: 5873139 (1999-02-01), Goth
patent: 6044905 (2000-04-01), Harrison, III
patent: 6056058 (2000-05-01), Gonzalez
patent: 249745 (1987-05-01), None
patent: 456397 (1991-04-01), None
patent: 2508095 (1982-03-01), None
patent: 2340861 (2000-01-01), None
patent: 59-044135 (1984-03-01), None
patent: WO 94/28282 (1984-12-01), None
Baker Service Tools, Model TD Plug Dropping Head Drawing 783-367, May 1990 1 page.
Bagnell David
Baker Hughes Incorporated
Dawelbeit Kamal
Duane Morris & Heckscher LLP
LandOfFree
Apparatus for dropping articles downhole does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for dropping articles downhole, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for dropping articles downhole will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2494926