Wells – Processes – Perforating – weakening – bending or separating pipe at an...
Reexamination Certificate
2000-01-14
2004-04-20
Walker, Zakiya (Department: 3672)
Wells
Processes
Perforating, weakening, bending or separating pipe at an...
Reexamination Certificate
active
06722435
ABSTRACT:
FIELD OF THE INVENTION
The field of the invention relates to flame-cutting techniques for making windows in casing for drilling laterals in existing wellbores.
BACKGROUND OF THE INVENTION
FIG. 1
a
illustrates a traditional method of window forming wherein a starter mill
10
is directed by whipstock
12
into the wall of the casing
14
. The typical shape of a window or opening
16
is shown in
FIG. 1
b
. The window is narrow when initially cut and proceeds to its maximum width when the mill
10
is approximately in the position shown in
FIG. 1
a
as its center is in alignment with the wall of the casing
14
. The mill
10
tends to bog down at this point because there is little relative rotation when the center of the mill is in alignment with the wall of the casing
14
. As a result, typically mills have been designed to have a build-up of cutting material
18
(shown in
FIG. 1
c
) to prevent coring out the starter mill
10
as it bogs down in the position shown in
FIG. 1
a
. Eventually, the starter mill
10
continues to cut and the remainder of the window (shown in
FIG. 1
b
as the lower half) begins to get progressively narrower until the starter mill
10
exits the window completely.
The traditional technique of using one or more mills, even if done in a one-trip technique involving orientation tools coupled with an anchor or packer, is still fairly time-consuming. Accordingly, one of the objectives of the present invention is to dramatically decrease the time required for formation of the window. Additionally, another objective of the invention is to be able to cut any desired window shape in a minimum amount of time, with the result that minimum debris or residue is left after employing the technique. Another objective is to eliminate the typical window profile illustrated in
FIG. 1
b
so that shorter kickoff diverters can be used when drilling the lateral through the window that is produced.
In the past, casing to be cut in two in a wellbore has been cut using techniques involving ignited combustible materials which are directed to a radial nozzle or nozzles to cut cleanly through the casing or tubular. These types of devices using a cutting flame radially to cut through a pipe are illustrated in U.S. Pat. Nos. 4,598,769 and 5,435,394. These devices are limited-purpose tools for cutting radially through a casing.
Explosive techniques for making a window in casing, using a shaped charge attached to a starter mill which is, in turn, attached to a whipstock, is illustrated in U.S. Pat. No. 5,636,692.
Another objective of the present invention is to use flame-cutting techniques to produce a window of desired shape rapidly to facilitate further downhole operations.
These aspects of the method will be more readily understood by those skilled in the art from a review of the details of the preferred embodiment described below.
SUMMARY OF THE INVENTION
A tool containing a solid combustible material is used to provide a pipe-cutting flame and to direct a pipe-cutting flame against a casing or tubular. The nozzles can be configured in any desired array and intensity. In the preferred embodiment, a rectangular window is burned away completely if the nozzles are sufficiently intense or the window is formed in segments if other distributions are used. The device can be anchored by a packer or anchor and can be run in the wellbore on tubing, wireline or electric line. The window can be produced in a single trip. The tool can be removed and a kick-off diverter installed adjacent the window for drilling the lateral.
REFERENCES:
patent: 2506799 (1950-05-01), Livingston
patent: 2535964 (1950-12-01), Stanton
patent: 2587244 (1952-02-01), Sweetman
patent: 2649046 (1953-08-01), Davis
patent: 2758543 (1956-08-01), Grandin
patent: 4298063 (1981-11-01), Regalbuto et al.
patent: 4352397 (1982-10-01), Christopher
patent: 4446920 (1984-05-01), Woytek et al.
patent: 4534423 (1985-08-01), Regalbuto
patent: 4598769 (1986-07-01), Robertson
patent: 4798244 (1989-01-01), Trost
patent: 4799829 (1989-01-01), Kenny
patent: 4905759 (1990-03-01), Wesson et al.
patent: 4960171 (1990-10-01), Parrott et al.
patent: 5135050 (1992-08-01), Tailby
patent: 5435394 (1995-07-01), Robertson
patent: 5636692 (1997-06-01), Haugen
patent: 5690171 (1997-11-01), Winch et al.
patent: 5709265 (1998-01-01), Haugen et al.
patent: 5791417 (1998-08-01), Haugen et al.
patent: 5813465 (1998-09-01), Terrell et al.
patent: 5862862 (1999-01-01), Terrell
patent: 6016753 (2000-01-01), Glenn et al.
patent: 6024169 (2000-02-01), Haugen
patent: 6035935 (2000-03-01), Regalbuto
patent: 6135206 (2000-10-01), Gano et al.
patent: 6202752 (2001-03-01), Kuck et al.
patent: 6536525 (2003-03-01), Haugen et al.
patent: 2002/0170713 (2002-11-01), Haugen et al.
patent: 2003/0070812 (2003-04-01), Robertson
patent: 0819827 (1998-01-01), None
patent: 0 846 838 (1998-06-01), None
patent: 2177740 (1987-01-01), None
patent: 2 346 633 (2000-08-01), None
patent: 1537793 (1987-05-01), None
patent: WO97/21903 (1997-06-01), None
patent: WO 99/64715 (1999-12-01), None
patent: WO 00/50727 (2000-08-01), None
patent: WO 00/66876 (2000-11-01), None
Cole, James; SPE/IADC 52824; Pyro Technology for Cutting Drill Pipe and Bottomhole Assemblies, 1999, 6 pages.
Robertson, Michael; Radial Cutting Torch, Department of Energy Tech Brief; Dec. 1994, 3 pages.
Typical Radial Cutting Torch Assembly, MRC Oil Tools, Date unknown, 2 pages.
Moser, Patterson & Sheridan L.L.P.
Walker Zakiya
Weatherford / Lamb, Inc.
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