Casing removal tool and methods of use for well abandonment
First Claim
Patent Images
1. A casing removal tool for a rigless removal of a portion of a wellbore casing from a wellbore, comprising:
- a tubular body configured to contain a thermite fuel mixture load comprising a gasifying compound and configured to initiate an exothermic reaction resulting in a molten thermite fuel;
a nozzle array comprising a plurality of densely packed nozzles positioned on an external surface of the tubular body, wherein the nozzle array is configured to project the molten thermite fuel onto a section of the wellbore casing so that the molten thermite fuel from each of the nozzles in the plurality of nozzles at least partially overlaps the molten thermite fuel from each adjacent nozzle in the plurality of nozzles; and
an orientation lug configured to orient and anchor into a downhole orientation tool comprising a linear and azimuthal orientation keyway, wherein orientation of the orientation lug comprises a change in an azimuthal angle at which the orientation lug interacts with the linear and azimuthal orientation keyway to cause a change in a section of a casing at which said casing removal tool impinges molten thermite fuel onto the section of the casing.
4 Assignments
0 Petitions
Accused Products
Abstract
Systems and methods for removing casing from a wellbore including a casing removal tool that includes a tubular body configured to contain a thermite fuel mixture configured to initiate into a molten thermite fuel. The casing removal tool also includes a nozzle array having a plurality of nozzles positioned on an external surface of the tubular body. The nozzle array is configured to impinge the molten thermite fuel from within the tubular onto the wellbore casing. The casing removal tool also includes an orientation lug configured to anchor into a downhole orientation tool.
10 Citations
28 Claims
-
1. A casing removal tool for a rigless removal of a portion of a wellbore casing from a wellbore, comprising:
-
a tubular body configured to contain a thermite fuel mixture load comprising a gasifying compound and configured to initiate an exothermic reaction resulting in a molten thermite fuel; a nozzle array comprising a plurality of densely packed nozzles positioned on an external surface of the tubular body, wherein the nozzle array is configured to project the molten thermite fuel onto a section of the wellbore casing so that the molten thermite fuel from each of the nozzles in the plurality of nozzles at least partially overlaps the molten thermite fuel from each adjacent nozzle in the plurality of nozzles; and an orientation lug configured to orient and anchor into a downhole orientation tool comprising a linear and azimuthal orientation keyway, wherein orientation of the orientation lug comprises a change in an azimuthal angle at which the orientation lug interacts with the linear and azimuthal orientation keyway to cause a change in a section of a casing at which said casing removal tool impinges molten thermite fuel onto the section of the casing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A method of removing casing from a wellbore with a casing removal tool, comprising:
-
lowering and setting a downhole orientation tool in the wellbore, the downhole orientation tool comprising a linear and azimuthal orientation keyway; lowering the casing removal tool into the wellbore, the casing removal tool comprising an orientation lug configured to orient and anchor into the downhole orientation tool; orienting the casing removal tool within the wellbore at a first linear orientation and a first azimuthal orientation by adjusting an azimuthal angle at which the orientation lug interacts with the linear and azimuthal orientation keyway, wherein the casing removal tool comprises a tubular body configured to contain a thermite fuel mixture load comprising a gasifying compound; initiating a burn of the thermite fuel mixture to produce an exothermic reaction resulting in a molten thermite fuel; projecting the molten thermite fuel through a nozzle array comprising a plurality of nozzles positioned adjacent to one another; impinging the molten thermite fuel onto a section of the casing to melt, vaporize, and/or disintegrate the casing, wherein the molten thermite fuel from each of the nozzles in the plurality of nozzles at least partially overlaps the molten thermite fuel from each adjacent nozzle in the plurality of nozzles; and retrieving the casing removal tool from the wellbore. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
-
-
20. A system for removing wellbore casing from a wellbore, comprising:
-
a downhole orientation tool configured to be secured within the wellbore, wherein the downhole orientation tool comprises a linear and azimuthal orientation keyway; and a plurality of casing removal tools, wherein each casing removal tool comprises; an orientation lug configured to orient within the keyway of the downhole orientation tool, wherein an operator can change a position of the orientation lugs before lowering the casing removal tools into the wellbore, and wherein the change in the position comprises a change in an azimuthal angle at which the orientation lug interacts with the linear and azimuthal orientation keyway to cause a change in a section of a casing at which said each casing removal tool impinges molten thermite fuel onto the section of the casing; a nozzle array comprising a plurality of densely packed nozzles configured to project the molten thermite fuel comprising a gasifying compound onto a continuous section of the wellbore casing after the casing removal tool is lowered into the wellbore; and a spacer configured to offset the nozzle array a linear distance from the downhole orientation tool. - View Dependent Claims (21, 22, 23, 24, 25)
-
-
26. A method of removing casing from a wellbore, comprising:
-
lowering a casing removal tool into the wellbore through a first wellbore tubing comprising a first diameter, wherein the wellbore comprises the first wellbore tubing and a second wellbore casing, and the casing removal tool comprises a nozzle section; lowering the casing removal tool through the second wellbore casing comprising a second diameter, wherein the second diameter is larger than the first diameter and the second wellbore tubing is downhole from the first wellbore tubing; orienting the casing removal tool within the second wellbore casing; initiating the casing removal tool to remove casing from the second wellbore casing; and retrieving the casing removal tool including the nozzle section from the wellbore, wherein orienting the casing removal tool comprises anchoring the casing removal tool to an orientation tool that remains secured within the wellbore after the casing removal tool including the nozzle section has been retrieved from the wellbore. - View Dependent Claims (27)
-
-
28. A casing removal tool for a rigless removal of a portion of a wellbore casing from a wellbore, comprising:
-
a tubular body configured to contain a thermite fuel mixture load comprising a gasifying compound and configured to initiate an exothermic reaction resulting in a molten thermite fuel, wherein the thermite fuel mixture load comprises an outer part adjacent to an inner diameter of the tubular body and a longitudinal axis at a central part of the thermite fuel mixture load, wherein the thermite fuel mixture load is configured to initiate along the longitudinal axis so that the thermite fuel mixture load reacts from the central part towards the outer part, whereby the outer part provides a thermal insulation against the exothermic reaction; a nozzle array comprising a plurality of densely packed nozzles positioned on an external surface of the tubular body, wherein the nozzle array is configured to project the molten thermite fuel onto a section of the wellbore casing so that the molten thermite fuel from each of the nozzles in the plurality of nozzles at least partially overlaps the molten thermite fuel from each adjacent nozzle in the plurality of nozzles; and an orientation lug configured to anchor into a downhole orientation tool.
-
Specification