WELLHEAD REMOVAL APPARATUS AND METHOD
Apparatus for use with a waterjet pump, a wellhead projecting above ground and a casing disposed below ground, the casing defining a longitudinal axis, the apparatus comprising, in use: a mount coupled to the wellhead; a platform coupled to the mount for rotation about a spin axis coincident with the longitudinal axis; a carrier coupled to the platform for rotation therewith, the carrier extending from an end disposed adjacent the platform, through the spin axis, to an end disposed adjacent the casing; a nozzle to which the carrier extends, which is coupled to the pump and which is directed radially with respect to the spin axis; a mechanism for causing the carrier to rotate; and an arrangement supporting the carrier for pivotal movement about a pivot axis perpendicular to the spin axis such that the nozzle is held in cutting position to the casing during rotation, to sever said casing.
This application claims the benefit of the filing date and cross-references pursuant to 35 U.S.C. 119(e) U.S. Provisional Patent Application Ser. 63/109,658, filed Nov. 4, 2020.
FIELDThe invention relates to the field of well head removal.
BACKGROUNDMothballed wells with protruding heads keep a great deal of arable land unworked worldwide.
SUMMARY OF THE INVENTIONForming one aspect of the invention is apparatus for use with a waterjet pump coupled to a supply of cutting fluid and with a well remnant, the well remnant having a head portion projecting above the ground and a tubular casing portion disposed within the ground, the casing defining a longitudinal axis.
The apparatus comprises:
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- a mount coupled in use to the head portion;
- a platform rotatably coupled in use to the mount for rotation about a spin axis substantially parallel to and coincident with the longitudinal axis;
- an elongate nozzle carrier coupled to the platform for rotation therewith, the carrier extending from a fixed end disposed adjacent the platform, through the spin axis, to a terminal end disposed adjacent the tubular casing;
- a nozzle to which the nozzle carrier extends, which is coupled in use to the waterjet pump and which is directed substantially radially with respect to the spin axis;
- a mechanism for causing the carrier to rotate in use; and
- an arrangement supporting the nozzle carrier for pivotal movement about an pivot axis substantially perpendicular to the spin axis, the arrangement being such that the nozzle is held in cutting position to the casing during said rotation, to sever said casing.
Apparatus 20 according to an exemplary embodiment of the invention is shown in the drawings and will be seen to include a mount 22, a platform 24, a nozzle carrier 26, a nozzle 28, a mechanism 30 and an arrangement 32.
The mount 22 is a planar structure having a central aperture 34 and a plurality of clamps 36.
The platform is defined by one 38 of the rings of a slewing bearing; the slewing bearing also has another ring 40 coupled to the mount, thereby to permit rotation of the platform about a spin axis X1-X1 defined by the slewing bearing.
The nozzle carrier is an elongate member defining a longitudinal axis X2-X2, having a fixed end 42 and a terminal end 44 and extending from the fixed end, through the spin axis, to the terminal end, the fixed end being disposed adjacent to the mount and offset from the spin axis X1-X1
The nozzle is a water jet nozzle.
The mechanism 30 comprises a gear 46 driven by a motor 48, the gear being in mesh with the one ring of the slewing bearing, thereby to provide for rotation of the platform.
The arrangement 32 supports the nozzle carrier for pivotal movement about a pivot axis X3-X3 substantially perpendicular to the spin axis and will be seen to include a receiving plate 50 having a through passage 52 for receiving the nozzle carrier and an elastomeric pivot bearing 54 coupling the receiving plate to the platform.
The apparatus is used with a waterjet pump (not shown) coupled to a supply of cutting fluid (not shown) and with a well remnant 100, the well remnant 100 having a head portion 102 projecting above the ground and a tubular casing portion 104 disposed within the ground, the casing defining a longitudinal axis X4-X4.
In use:
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- the mount is coupled to the head portion, as shown in
FIG. 8 - the nozzle is coupled to the waterjet pump and the supply of cutting fluid; in the embodiment shown, the coupling is provided by a helical coil 106
- the mechanism is operated to cause the nozzle carrier to rotate; and
- the arrangement holds the nozzle in cutting position to the casing, thereby to sever said casing.
- the mount is coupled to the head portion, as shown in
Whereas a specific embodiment is shown and described, it will be appreciated that variations in use and structure are possible. Without limitation in this regard, it will be appreciated that the apparatus can be used with casings of varying diameter, merely by adjusting the offset between the aperture in the receiving plate and the pivot axis; a plurality of equally spaced mounting holes 56 in the receiving plate are provided for this purpose. Accordingly, the invention should be understood to be limited only by the accompanying claims, purposively construed.
Claims
1. Apparatus for use with a waterjet pump coupled to a supply of cutting fluid and with a well remnant, the well remnant having a head portion projecting above the ground and a tubular casing portion disposed within the ground, the casing defining a longitudinal axis, the apparatus comprising:
- a mount coupled in use to the head portion;
- a platform rotatably coupled in use to the mount for rotation about a spin axis substantially parallel to and coincident with the longitudinal axis;
- an elongate nozzle carrier coupled to the platform for rotation therewith, the carrier extending from a fixed end disposed adjacent the platform, through the spin axis, to a terminal end disposed adjacent the tubular casing;
- a nozzle to which the nozzle carrier extends, which is coupled in use to the waterjet pump and which is directed substantially radially with respect to the spin axis;
- a mechanism for causing the carrier to rotate in use; and
- an arrangement supporting the nozzle carrier for pivotal movement about an pivot axis substantially perpendicular to the spin axis, the arrangement being such that the nozzle is held in cutting position to the casing during said rotation, to sever said casing.
Type: Application
Filed: Oct 27, 2021
Publication Date: May 5, 2022
Inventor: DAVE BUNKER (Stoney Creek, CA)
Application Number: 17/511,651