GB2623662A - A method for cutting off a tubular in a subterranean well and removing the cut-off section of the tubular from the well - Google Patents

A method for cutting off a tubular in a subterranean well and removing the cut-off section of the tubular from the well Download PDF

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Publication number
GB2623662A
GB2623662A GB2400257.8A GB202400257A GB2623662A GB 2623662 A GB2623662 A GB 2623662A GB 202400257 A GB202400257 A GB 202400257A GB 2623662 A GB2623662 A GB 2623662A
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GB
United Kingdom
Prior art keywords
tool
tubular
spear
pull
cut
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
GB2400257.8A
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GB202400257D0 (en
Inventor
Tore Torvestad Bjorn
Bergesen Thomas
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Archer Oiltools AS
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Archer Oiltools AS
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Filing date
Publication date
Application filed by Archer Oiltools AS filed Critical Archer Oiltools AS
Publication of GB202400257D0 publication Critical patent/GB202400257D0/en
Publication of GB2623662A publication Critical patent/GB2623662A/en
Pending legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
    • E21B29/002—Cutting, e.g. milling, a pipe with a cutter rotating along the circumference of the pipe
    • E21B29/005—Cutting, e.g. milling, a pipe with a cutter rotating along the circumference of the pipe with a radially-expansible cutter rotating inside the pipe, e.g. for cutting an annular window
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
    • E21B23/01—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for anchoring the tools or the like
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
    • E21B29/002—Cutting, e.g. milling, a pipe with a cutter rotating along the circumference of the pipe
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B31/00—Fishing for or freeing objects in boreholes or wells
    • E21B31/12—Grappling tools, e.g. tongs or grabs
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B31/00—Fishing for or freeing objects in boreholes or wells
    • E21B31/12—Grappling tools, e.g. tongs or grabs
    • E21B31/16—Grappling tools, e.g. tongs or grabs combined with cutting or destroying means
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B31/00—Fishing for or freeing objects in boreholes or wells
    • E21B31/12—Grappling tools, e.g. tongs or grabs
    • E21B31/20—Grappling tools, e.g. tongs or grabs gripping internally, e.g. fishing spears

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Marine Sciences & Fisheries (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Piles And Underground Anchors (AREA)
  • Knives (AREA)

Abstract

A method for cutting off a tubular in a subterranean well and removing a cut-off section of the tubular from the subterranean well. The method comprises providing a downhole tool assembly 10 on a work string 20 wherein a through-bore 19 extends through the work string and the tool assembly 10. The tool assembly comprising, from top to bottom: a pull tool 14; an anchor tool 11 for anchoring the pull tool to a first tubular 1; a space-out drill pipe string 21; a spear tool 12, for anchoring the pull tool to a second tubular 2, at least partially surrounded by the first tubular, a valve tool 16 for controlling fluid communication in the through-bore; and a cutter tool 13 for cutting the second tubular. The method also comprises running the tool string running the tool string into the desired portion of the second casing, cutting, pulling and releasing the anchor tool, thereby pulling the entire tool assembly 10 with the cut-off section of the second tubular out of the well. A downhole tool assembly incorporating the features of the assembly of claim 1 is also disclosed.

Description

A METHOD FOR CUTTING OFF A TUBULAR IN A SUBTERRANEAN WELL AND REMOVING THE CUT-OFF SECTION OF THE TUBULAR FROM THE WELL.
Introduction
The present invention is method for cutting off a tubular in a subterranean well and removing a cut-off section of said tubular from the subterranean well. The invention is also a downhole tool assembly (10) for cutting off a tubular in a subterranean well and removing the cut-off section of said tubular from the subterranean well, said assembly (10) being conveyed on a work string (20).
Background art
In the background art, a liner or casing or other second tubing arranged in a well and surrounded by a first tubing such as a casing, e.g. said second tubing arranged in a tubing hanger near the bottom of the first casing, is cut at a target depth in the second tubing, a stinger is attached in the top of the second tubing, and pull is exerted on the work string from surface. The second casing is very often stuck in settled baryte or other sediments, or cement. Friction onto the work string, e.g. a drill pipe string, in the well along the entire length of the first tubing, all the way from the surface and down to the spear in the top of the second casing, may be large and much force is lost along the work string path. Thus, one may not pull loose a cut-off length of the second casing more than a few metres. Such cutting tools and spears used are normally controlled by balls which take up to several hours to circulate in to land in a seat in each tool to be used, and the tools may be pressure and / or pull actuated.
One solution is to arrange an anchor and a jack in the second casing and a space-out down to the spear, using a valve to control the flow either to the cutter tool or the casing anchor and jack. Still those are ball operated and take much time to control.
Summary of the present invention
The present invention is defined in the attached main claims.
Brief Figure Captions Fig. 1 is an overview of the well context and an overview of the toolstring.
Fig. 2 is an overview of the toolstring after a cut has been made at the target depth.
Fig. 3 is an overview of the toolstring with knives retracted and the spear pulled up to the top of the cut-off second casing section, and the anchor set in the first casing and the pull tool pulling by hydraulic means.
Description of embodiments of the Invention
The invention is described as a method and a tool string in the claims.
In an embodiment of the invention one does not conduct the pressure test and possible washing out of the annulus after the cut has been made, one goes directly to Fig.3 and starts jack-pulling loose the cut-off part of the second casing The toolstring is controlled via the valve tool (16). The valve tool is controlled for opening or closing via an electronic control unit which enables different valve positions to be preselected, and the valve tool is actuated by pressure and / or flow rate through the work string.
In this manner, the valve tool is closed, the spear is pressure initiated, pull on the work string sets the spear, and held. The valve is then opened.
In this manner, with the valve tool open, flow goes to the cutter tool which is actuated to extend the knives and cut at target depth. Advantageously the tension-vulnerable valve tool is arranged below the spear.
Now the valve tool may open a channel to the packer tool, packer is set, and flow may pass through the valve tool (and the cutter tool) to test circulation out through the cut and the annulus around the second, cut-off casing.
One may wash if there is circulation. One may try to pull if there is circulation.
One may then release the spear and pull up close the valve tool and set the spear it in the top of the cutoff casing, set the anchor tool and increase pressure to hydraulically pull free the cut-off casing. If the stroke length of the pull tool is about 1.2m, this length may be sufficient to pull free the cut-off casing. If not, one may release the anchor, stroke out the pull tool and set the anchor to pull further.
When the cut-off part of the second casing is free, one may release the anchor and pull out of hole the entire tool string and cut-off part of the second casing.
The following numbered clauses up to the end of page 8 of the present description correspond to the claims of UK patent application no. 2301154.7 as filed. The claims of the present application as filed, which is divided from UK patent application no. 2301154.7, can be found on the subsequent pages 9 to 14 of the specification which begin with the heading "CLAIMS".
Clauses 1. A method for cutting off a tubular in a subterranean well and removing a cut-off section of said tubular from the subterranean well, wherein the method comprises: a) providing a downhole tool assembly (10) on a work string (20) wherein a through-bore (19 extends through said work string (20) and said tool assembly (10), the tool assembly (10) comprising, from top to bottom: -a pull tool (14), - an anchor tool (11) for anchoring the pull tool (14) to a first tubular ( -a space-out drill pipe s (21); -a spear tool (12) for anchoring the pull tool 4 to a second tubular (2), at least partially surrounded by the first tubular (1), - a packer tool (15), - a valve tool (16) for controlling fluid communication in the through-bore (19), wherein a first fluid conduit (161) extends between the valve tool (16) and the packer tool (15), - a cutter tool (13) for cutting said second tubular (2), b) lowering the tool assembly (10) into the well until said anchor tool is enclosed by the first tubular (1) and near a top of said second tubular (2), and said cutter tool is at a target cutting depth and the spear tool (12) is enclosed by the second tubular (2), c) instructing the valve tool (16) to close so as to prevent fluid communication through said through-bore (19) such that a set of slips (121) in the spear tool (12) is pressure-actuated and brought in contact with the second tubular (2), d) actuating the spear tool (12) for gripping engagement of the spear tool (12) with the second tubular (2); e) instructing the valve tool (16) to fully open so as to enable fluid communication through said through-bore (19) such that the fluid is allowed to actuate the cutter tool (13) so that knives (131) of the cutter tool (13) are deployed by means of fluid pressure and/or fluid flow, f) rotating the cutter tool (13) so as to cut-off a section of the second tubular (2) by means of the deployed knives (131) of the cutter tool (13), g) reducing the fluid pressure and/or fluid flow so as to retract the deployed knives (131) of the cutter tool (13), h) instructing the valve tool (16) to open the first fluid conduit (161) for enabling setting of the packer tool (15) in the second tubular (2), above the cut, to set the packer tool (15), i) pressure-testing for presence of fluid communication, via said cut and said annulus, in the annulus external to the second tubular, unsetting the packer tool (15), k) releasing the spear tool (12) from said second tubular (2), L.) pulling up the tool assembly (10) until the spear tool (12) is near a top portion of the cut-off section of the second tubular (2), m) instructing the valve tool (16) to close so as to prevent fluid communication through said through-bore (19) such that a set of slips (121) in the spear tool (12) is pressure-actuated and brought in contact with the second tubular (2) for engagement of the spear tool (12) with the top portion of the cut-off section of the second tubular (2) and actuating the spear tool (12) to hold said top portion of the cut-off section, n) pressure-actuating a set of anchor slips (111) of the anchor tool (11) for gripping engagement with the first tubular (1), o) pressure-actuating the pull tool (14) to pull upwards said space-out drill pipe string (21) with said spear tool (12) and the thereto engaged cut-off section of the second tubular (2) thus releasing said cut-off section of the second tubular (2) from its stuck state in the well, p) releasing said anchor tool (11) from the first tubular (1), and q) pulling the entire tool assembly (10) with the cut-off section of the second tubular (2) out of the well.
2. Method according to clause 1, wherein the method further comprises: -providing a no-go unit (111) in order to prevent downwards movement of the anchor (11) beyond said top of the second tubular (2).
3, Method according to any of the preceding clauses, wherein the process of instructing said valve tool (16) comprises sending a control signal (S) from the surface to a receiver (R) of an electronic control unit (162) in said valve tool (16), said electronic control unit (162), on the basis of said control signal (8), prepare pressure-actuated operation of a valve element (164) of said valve toll (16) to open/close said through-bore (19).
4. Method according to clause 3, wherein the control signal (S) is transmitted to the receiver (R) of the electronic control unit (162) along a wired pipe -work shine (20).
5. Method according to clause 3, wherein the control signal (S) is a pressure pulse signal transmitted to the receiver (R) of the electronic control unit (162) via the fluid of the through-bore (19) of the work string (20).
6. Method according to clause 3, wherein the control signal (S) comprises RFID-tags placed in the fluid of the through-bore of the work string (20), whereupon said RFID-tags are, via the fluid of the through-bore, transmitted to an RFID-reader associated with the receiver (R) of the electronic control unit (162).
7. Method according to clause 3, wherein the control signal (S) is in the form of tool rotation parameters, including rotational speed and/or duration of rotation, wherein said receiver (R) of the electronic control unit (162) comprises a a rotation sensor (RS) for tool rotation parameters.
8. Method according to any of the preceding clauses, wherein at least one of the spear tool (12), and the cutter tool (13) is mechanically actuated, said spear tool (12) actuated by upward pull via said space-out drill pipe string (21), said cutter tool (13) actuated by rotation of said work string (20).
9. Method according to any of the preceding clauses, wherein at least one of said pull tool (14), said anchor tool (11), said spear tool (12), said packer tool (15), said valve tool (16), wherein -said pull tool (14) is actuated by pressure through said work string (20) with said valve tool (16) closed; -said anchor tool (11) is actuated by pressure in said work string (20) arid pull via said pull tool (14) while said space-out drill pipe string (21) with said spear tool (12) is set; said spear tool (12) is set via pull in said work string (20) and reinforced via pull via said space-out drill pipe string (21) from said pull tool (14); -said cutter tool (13) is hydraulically actuated by pressure and/or flow rate when said valve tool (16) is open.
10. Method according to any of the preceding clauses, wherein if pressure-testing detects presence of fluid communication between the through-bore (19) and the annulus, via the cut, increasing the fluid pressure and the flow rate in the work string (20) in order to at least partially wash out sediments from said annulus.
11. Method according to any of the preceding clauses, wherein a second fluid conduit (162) extends between the packer tool (15) and the spear tool (12) so as to enable fluid communication between said valve tool (16) and said spear tool (12), via said packer tool (15), wherein, prior to setting of the packer tool (15) in the second tubular (2), a set of slips (121) in the spear tool (12) is actuated and brought in contact with the second tubular (2) by means of fluid flowing through the first and second fluid conduits (161, 162) from said valve tool (16) to said spear tool (12), via said packer tool (15).
12. A downhole tool assembly (10) for cutting off a tubular in a subterranean well and removing the cut-off section of said tubular from the subterranean well, said assembly (10) for being conveyed on a work string (20), wherein a through-bore (19) extends through said work string (20) and said tool assembly (10), the tool assembly (10) comprising, from top to bottom: -a pull tool (14), - an anchor tool (11) for anchoring the downhole pull tool (14) to a first tubular (1), said anchor tool comprising a set of pressure-actuated anchor slips (111) for engaging with the first tubular (1), - a space-out drill pipe string (21), -a spear tool (12) for anchoring the downhole pull tool (14) to a second tubular (2); said spear tool comprising a set of pressure-actuated slips (121) for engaging with the second tubular (2), -a pressure-actuated packer tool (15); - a valve tool (16) for controlling fluid communication in the through-bore, wherein a first fluid conduit (161) extends between the valve tool (16) and the packer tool (15), -a pressure-actuated rotatable cutter tool (13) for cutting said second tubular (2), said cutter tool (13) comprising retractable knives (131), said tool assembly (10) being suitable for releasing the cut-off section of the second tubular (2) and pulling the entire tool assembly (10) with the cut-off section of the second tubular (2) out of the well.
13. Downhole tool assembly (10) according to clause 12, wherein the tool assembly (10) comprises a no-go unit (111) arranged immediately below said anchor tool (12).
14. Downhole tool assembly (10) according to any of the clauses 12-13, wherein the space-out drill pipe string (21) has a length that is commensurate to a length between the top of the second tubular (2) and the target cut.
15. Downhole tool assembly (10) according to clause 14, wherein the length between the top of the second tubular (2) and the target cut in the range between 30 m and 600 m.
16. Downhole tool assembly (10) according to clause 12, wherein the packer tool (16) and the valve tool (16) are combined into one valve and packer tool unit (15, 16).
17. Dovvnhole tool assembly (10) according to any of the clauses 12-16, wherein the valve tool (16) is in an open state when the knives (131) of the cutting tool (13) are deployed.
18. Downhoie tool assembly (10) according to any of the clauses 12-16, wherein the valve tool (16) is in a closed state when the pull tool (14) is pulling the cut-off section of the second tubular (2).
19. Dovvnhole tool assembly (10) according to any of the clauses 12-18, wherein a second fluid conduit (162) extends between the packer tool (15) and the spear tool (12) so as to enable fluid communication between said packer tool (15) and said spear tool (12).
1 A method for cutting off a tubular in a subterranean well and removing a cut-off section of said tubular from the subterranean well, wherein the method comprises: a) providing a downhole tool assembly on a drill pipe work string (20) wherein a through-bore (19) extends through said work string (20) and said tool assembly, the tool assembly comprising, from top to bottom: - a pull tool (14), - an anchor tool (11) for anchoring the pull tool (14) to a first tubular (1), -a space-out drill pipe string (21), - a spear tool (12) for anchoring the pull tool (14) to a second tubular (2), at least partially surrounded by the first tubular (1), -a valve tool (16) for controlling fluid communication in the through-bore (19), -a cutter tool (13) for cutting said second tubular (2), b) lowering the tool assembly (10) into the well until said anchor tool (11) is enclosed by the first tubular (1) and near a top of said second tubular (2), and said cutter tool (13) is at a target cutting depth and the spear tool (12) is enclosed by the second tubular (2), c) instructing the valve tool (16) to close so as to prevent fluid communication through said through-bore (19) such that a set of slips (121) in the spear tool (12) is pressure-actuated and brought in contact with the second tubular (2), d) actuating the spear tool (12) for gripping engagement of the spear tool (12) with the second tubular (2), e) instructing the valve tool (16) to fully open so as to enable fluid communication through said through-bore (19) such that the fluid is allowed to actuate the cutter tool (13) so that knives (131) of the cutter tool (13) are deployed by means of fluid pressure and/or fluid flow, o rotating the cutter tool (13) so as to cut-off a section of the second tubular (2) by means of the deployed knives (131) of the cutter tool (13), g) reducing the fluid pressure and/or fluid flow so as to retract the deployed knives (131) of the cutter tool (13), h) releasing the spear tool (12) from said second tubular (2), i) pulling up the tool assembly (10) until the spear tool (12) is near a top portion of the cut-off section of the second tubular (2), j) instructing the valve tool (16) to close so as to prevent fluid communication through said through-bore (19) such that a set of slips (121) in the spear tool (12) is pressure-actuated and brought in contact with the second tubular (2) for engagement of the spear tool (12) with the top portion of the cut-off section of the second tubular (2) and actuating the spear tool (12) to hold said top portion of the cut-off section, k) pressure-actuating a set of anchor slips (111) of the anchor tool (11) for gripping engagement with the first tubular (1), I) pressure-actuating the pull tool (14) to pull upwards said space-out drill pipe string (21) with said spear tool (12) and the thereto engaged cut-off section of the second tubular (2) thus releasing said cut-off section of the second tubular (2) from its stuck state in the well, m) releasing said anchor tool (11) from the first tubular (1), and n) pulling the entire tool assembly with the cut-off section of the second tubular (2) out of the well.
2. The method according to claim 1, wherein the method further comprises: -providing a no-go unit in order to prevent downwards movement of the anchor (11) beyond said top of the second tubular (2).
3. The method according to any of the preceding claims, wherein the process of instructing said valve tool (16) comprises sending a control signal (S) from the surface to a receiver (R) of an electronic control unit in said valve tool (16), said electronic control unit, on the basis of said control signal (S), prepare pressure-actuated operation of a valve element of said valve tool (16) to open/close said through-bore (19).
4. The method according to 3, wherein the control signal (S) is transmitted to the receiver (R) of the electronic control unit along a wired pipe -work string (20).
5. The method according to claim 3, wherein the control signal (S) is a pressure pulse signal transmitted to the receiver (R) of the electronic control unit via the fluid of the through-bore (19) of the work string (20).
6. The method according to claim 3, wherein the control signal (S) comprises RFID-tags placed in the fluid of the through-bore (19) of the work string (20), whereupon said RFID-tags are, via the fluid of the through-bore (19), transmitted to an RFID-reader associated with the receiver (R) of the electronic control unit.
7. The method according to claim 3, wherein the control signal (S) is in the form of tool rotation parameters, including rotational speed and/or duration of rotation, wherein said receiver (R) of the electronic control unit comprises a rotation sensor (RS) for tool rotation parameters.
8. The method according to any of the preceding claims, wherein at least one of the spear tool (12), and the cutter tool (13) is mechanically actuated, said spear tool (12) actuated by upward pull via said space-out drill pipe string (21), said cutter tool (13) actuated by rotation of said work string (20).
9. The method according to any of the preceding claims, wherein at least one of said pull tool (14), said anchor tool (11), said spear tool (12), said packer tool (15), said valve tool (16), 25 wherein -said pull tool (14) is actuated by pressure through said work string (20) with said valve tool (16) closed; - said anchor tool (11) is actuated by pressure in said work string (20) and pull via said pull tool (14) while said space-out drill pipe string (21) with said spear tool (12) is set; - said spear tool (12) is set via pull in said work string (20) and reinforced via pull via said space-out drill pipe string (21) from said pull tool (14); -said cutter tool (13) is hydraulically actuated by pressure and/or flow rate when said valve tool (16) is open.
10. The method according to any of the preceding claims, wherein if pressure-testing detects presence of fluid communication between the through-bore (19) and the annulus, via the cut, increasing the fluid pressure and the flow rate in the work string (20) in order to at least partially wash out sediments from said annulus.
11. The method according to any of the preceding claims, wherein a second fluid conduit (162) extends between the packer tool (15) and the spear tool (12) so as to enable fluid communication between said valve tool (16) and said spear tool (12), via said packer tool (15), wherein, prior to setting of the packer tool (15) in the second tubular (2), a set of slips (121) in the spear tool (12) is actuated and brought in contact with the second tubular (2) by means of fluid flowing through the first and second fluid conduits (162) from said valve tool (16) to said spear tool (12), via said packer tool (15).
12. A downhole tool assembly for cutting off a tubular in a subterranean well and removing the cut-off section of said tubular from the subterranean well, said assembly for being conveyed on a work string (20), wherein a through-bore (19) extends through said work string (20) and said tool assembly (10), the tool assembly comprising, from top to bottom: -a pull tool (14), -an anchor tool (11) for anchoring the downhole pull tool (14) to a first tubular (1), said anchor tool (11) comprising a set of pressure-actuated anchor slips for engaging with the first tubular (1), -a space-out drill pipe string (21), - a spear tool (12) for anchoring the downhole pull tool (14) to a second tubular (2), said spear tool comprising a set of pressure-actuated slips (121) for engaging with the second tubular (2), - a valve tool (16) for controlling fluid communication in the through-bore, -a pressure-actuated, rotatable cutter tool (13) for cutting said second tubular (2), said cutter tool (13) comprising retractable knives (131), said tool assembly (10) being suitable for releasing the cut-off section of the second tubular (2) and pulling the entire tool assembly (10) with the cut-off section of the second tubular (2) out of the well.
13. Downhole tool assembly according to claim 12, wherein the tool assembly (10) comprises a no-go unit (111) arranged immediately below said anchor tool (11).
14. Downhole tool assembly (10) according to any of the claims 12-13, wherein the space-out drill pipe string (21) has a length that is commensurate to a length between the top of the second tubular (2) and the target cut.
15. Downhole tool assembly (10) according to claim 14, wherein the length between the top of the second tubular (2) and the target cut in the range between 30 m and 600 m.
16. Downhole tool assembly (10) according to claim 12, wherein the packer tool (15) and the valve tool (16) are combined into one valve and packer tool unit (15, 16).
17. Downhole tool assembly (10) according to any of the claims 12-16, wherein the valve tool (16) is in an open state when the knives of the cutting tool (13) are deployed.
18. Downhole tool assembly (10) according to any of the claims 12-16, wherein the valve tool (16) is in a closed state when the pull tool (14) is pulling the cut-off section of the second tubular (2).
19. Downhole tool assembly (10) according to any of the claims 12-18, wherein a second fluid conduit (162) extends between the packer tool (15) and the spear tool (12) so as to enable fluid communication between said packer tool (15) and said spear tool (12).

Claims (19)

  1. CLAIMS1 A method for cutting off a tubular in a subterranean well and removing a cut-off section of said tubular from the subterranean well, wherein the method comprises: a) providing a downhole tool assembly on a drill pipe work string (20) wherein a through-bore (19) extends through said work string (20) and said tool assembly, the tool assembly comprising, from top to bottom: -a pull tool (14), -an anchor tool (11) for anchoring the pull tool (14) to a first tubular (1), -a space-out drill pipe string (21), -a spear tool (12) for anchoring the pull tool (14) to a second tubular (2), at least partially surrounded by the first tubular (1), -a valve tool (16) for controlling fluid communication in the through-bore (19), -a cutter tool (13) for cutting said second tubular (2), b) lowering the tool assembly (10) into the well until said anchor tool (11) is enclosed by the first tubular (1) and near a top of said second tubular (2), and said cutter tool (13) is at a target cutting depth and the spear tool (12) is enclosed by the second tubular (2), c) instructing the valve tool (16) to close so as to prevent fluid communication through said through-bore (19) such that a set of slips (121) in the spear tool (12) is pressure-actuated and brought in contact with the second tubular (2), d) actuating the spear tool (12) for gripping engagement of the spear tool (12) with the second tubular (2), e) instructing the valve tool (16) to fully open so as to enable fluid communication through said through-bore (19) such that the fluid is allowed to actuate the cutter tool (13) so that knives (131) of the cutter tool (13) are deployed by means of fluid pressure and/or fluid flow, f) rotating the cutter tool (13) so as to cut-off a section of the second tubular (2) by means of the deployed knives (131) of the cutter tool (13), g) reducing the fluid pressure and/or fluid flow so as to retract the deployed knives (131) of the cutter tool (13), h) releasing the spear tool (12) from said second tubular (2), i) pulling up the tool assembly (10) until the spear tool (12) is near a top portion of the cut-off section of the second tubular (2), j) instructing the valve tool (16) to close so as to prevent fluid communication through said through-bore (19) such that a set of slips (121) in the spear tool (12) is pressure-actuated and brought in contact with the second tubular (2) for engagement of the spear tool (12) with the top portion of the cut-off section of the second tubular (2) and actuating the spear tool (12) to hold said top portion of the cut-off section, k) pressure-actuating a set of anchor slips (111) of the anchor tool (11) for gripping engagement with the first tubular (1), I) pressure-actuating the pull tool (14) to pull upwards said space-out drill pipe string (21) with said spear tool (12) and the thereto engaged cut-off section of the second tubular (2) thus releasing said cut-off section of the second tubular (2) from its stuck state in the well, m) releasing said anchor tool (11) from the first tubular (1), and n) pulling the entire tool assembly with the cut-off section of the second tubular (2) out of the well.
  2. 2. The method according to claim 1, wherein the method further comprises: -providing a no-go unit in order to prevent downwards movement of the anchor (11) beyond said top of the second tubular (2)
  3. 3. The method according to any of the preceding claims, wherein the process of instructing said valve tool (16) comprises sending a control signal (S) from the surface to a receiver (R) of an electronic control unit in said valve tool (16), said electronic control unit, on the basis of said control signal (S), prepare pressure-actuated operation of a valve element of said valve tool (16) to open/close said through-bore (19).
  4. 4. The method according to 3, wherein the control signal (S) is transmitted to the receiver (R) of the electronic control unit along a wired pipe -work string (20).
  5. 5. The method according to claim 3, wherein the control signal (S) is a pressure pulse signal transmitted to the receiver (R) of the electronic control unit via the fluid of the through-bore (19) of the work string (20).
  6. 6. The method according to claim 3, wherein the control signal (S) comprises RFID-tags placed in the fluid of the through-bore (19) of the work string (20), whereupon said RFID-tags are, via the fluid of the through-bore (19), transmitted to an RFID-reader associated with the receiver (R) of the electronic control unit.
  7. 7. The method according to claim 3, wherein the control signal (S) is in the form of tool rotation parameters, including rotational speed and/or duration of rotation, wherein said receiver (R) of the electronic control unit comprises a rotation sensor (RS) for tool rotation parameters.
  8. 8. The method according to any of the preceding claims, wherein at least one of the spear tool (12), and the cutter tool (13) is mechanically actuated, said spear tool (12) actuated by upward pull via said space-out drill pipe string (21), said cutter tool (13) actuated by rotation of said work string (20).
  9. 9. The method according to any of the preceding claims, wherein at least one of said pull tool (14), said anchor tool (11), said spear tool (12), said packer tool (15), said valve tool (16), wherein - said pull tool (14) is actuated by pressure through said work string (20) with said valve tool (16) closed; -said anchor tool (11) is actuated by pressure in said work string (20) and pull via said pull tool (14) while said space-out drill pipe string (21) with said spear tool (12) is set; - said spear tool (12) is set via pull in said work string (20) and reinforced via pull via said space-out drill pipe string (21) from said pull tool (14); - said cutter tool (13) is hydraulically actuated by pressure and/or flow rate when said valve tool (16) is open.
  10. 10. The method according to any of the preceding claims, wherein if pressure-testing detects presence of fluid communication between the through-bore (19) and the annulus, via the cut, increasing the fluid pressure and the flow rate in the work string (20) in order to at least partially wash out sediments from said annulus.
  11. 11. The method according to any of the preceding claims, wherein a second fluid conduit (162) extends between the packer tool (15) and the spear tool (12) so as to enable fluid communication between said valve tool (16) and said spear tool (12), via said packer tool (15), wherein, prior to setting of the packer tool (15) in the second tubular (2), a set of slips (121) in the spear tool (12) is actuated and brought in contact with the second tubular (2) by means of fluid flowing through the first and second fluid conduits (162) from said valve tool (16) to said spear tool (12), via said packer tool (15).
  12. 12. A downhole tool assembly for cutting off a tubular in a subterranean well and removing the cut-off section of said tubular from the subterranean well, said assembly for being conveyed on a work string (20), wherein a through-bore (19) extends through said work string (20) and said tool assembly (10), the tool assembly comprising, from top to bottom: -a pull tool (14), -an anchor tool (11) for anchoring the downhole pull tool (14) to a first tubular (1), said anchor tool (11) comprising a set of pressure-actuated anchor slips for engaging with the first tubular (1), -a space-out drill pipe string (21), -a spear tool (12) for anchoring the downhole pull tool (14) to a second tubular (2), said spear tool comprising a set of pressure-actuated slips (121) for engaging with the second tubular (2), -a valve tool (16) for controlling fluid communication in the through-bore, -a pressure-actuated, rotatable cutter tool (13) for cutting said second tubular (2), said cutter tool (13) comprising retractable knives (131), said tool assembly (10) being suitable for releasing the cut-off section of the second tubular (2) and pulling the entire tool assembly (10) with the cut-off section of the second tubular (2) out of the well.
  13. 13. Downhole tool assembly according to claim 12, wherein the tool assembly (10) comprises a no-go unit (111) arranged immediately below said anchor tool (11).
  14. 14. Downhole tool assembly (10) according to any of the claims 12-13, wherein the space-out drill pipe string (21) has a length that is commensurate to a length between the top of the second tubular (2) and the target cut.
  15. 15. Downhole tool assembly (10) according to claim 14, wherein the length between the top of the second tubular (2) and the target cut in the range between 30 m and 600 m.
  16. 16. Downhole tool assembly (10) according to claim 12, wherein the packer tool (15) and the valve tool (16) are combined into one valve and packer tool unit (15, 16).
  17. 17. Downhole tool assembly (10) according to any of the claims 12-16, wherein the valve tool (16) is in an open state when the knives of the cutting tool (13) are deployed.
  18. 18. Downhole tool assembly (10) according to any of the claims 12-16, wherein the valve tool (16) is in a closed state when the pull tool (14) is pulling the cut-off section of the second tubular (2).
  19. 19. Downhole tool assembly (10) according to any of the claims 12-18, wherein a second fluid conduit (162) extends between the packer tool (15) and the spear tool (12) so as to enable fluid communication between said packer tool (15) and said spear tool (12).
GB2400257.8A 2020-06-26 2021-06-25 A method for cutting off a tubular in a subterranean well and removing the cut-off section of the tubular from the well Pending GB2623662A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20200757A NO346136B1 (en) 2020-06-26 2020-06-26 A method for cutting off a tubular in a subterranean well and removing the cut-off section of the tubular from the well, and a toolstring thereof.
GB2301154.7A GB2611955B (en) 2020-06-26 2021-06-25 A method for cutting off a tubular in a subterranean well removing the cut-off section of the tubular from the well

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GB202400257D0 GB202400257D0 (en) 2024-02-21
GB2623662A true GB2623662A (en) 2024-04-24

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GB2400257.8A Pending GB2623662A (en) 2020-06-26 2021-06-25 A method for cutting off a tubular in a subterranean well and removing the cut-off section of the tubular from the well
GB2301154.7A Active GB2611955B (en) 2020-06-26 2021-06-25 A method for cutting off a tubular in a subterranean well removing the cut-off section of the tubular from the well

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Citations (4)

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Publication number Priority date Publication date Assignee Title
GB2574647A (en) * 2018-06-14 2019-12-18 Ardyne Holdings Ltd Improvements In Or Relating To Well Abandonment And Slot Recovery
GB2583015A (en) * 2019-02-14 2020-10-14 Ardyne Holdings Ltd Improvements in or relating to well abandonment and slot recovery
GB2583166A (en) * 2019-02-07 2020-10-21 Ardyne Holdings Ltd Improvements in or relating to well abandonment and slot recovery
GB2584281A (en) * 2019-05-24 2020-12-02 Ardyne Holdings Ltd Improvements in or relating to well abandonment and slot recovery

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NO330750B1 (en) * 2009-09-10 2011-07-04 Bruce Alan Flanders Well tool and method for cutting and extracting a rudder portion from a rudder string in a well
MX2017000748A (en) * 2014-08-19 2017-05-01 Halliburton Energy Services Inc Behind pipe evaluation of cut and pull tension prediction in well abandonment and intervention operations.
EP3494277B1 (en) * 2016-11-04 2020-12-09 Ardyne Holdings Limited Method of removing a downhole casing
US10508510B2 (en) * 2017-11-29 2019-12-17 Baker Hughes, A Ge Company, Llc Bottom hole assembly for cutting and pulling a tubular
WO2020006333A1 (en) * 2018-06-28 2020-01-02 Schlumberger Technology Corporation Methods and apparatus for removing sections of a wellbore wall
GB2576010B (en) * 2018-08-01 2021-02-17 Ardyne Holdings Ltd Improvements in or relating to well abandonment and slot recovery

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Publication number Priority date Publication date Assignee Title
GB2574647A (en) * 2018-06-14 2019-12-18 Ardyne Holdings Ltd Improvements In Or Relating To Well Abandonment And Slot Recovery
GB2583166A (en) * 2019-02-07 2020-10-21 Ardyne Holdings Ltd Improvements in or relating to well abandonment and slot recovery
GB2583015A (en) * 2019-02-14 2020-10-14 Ardyne Holdings Ltd Improvements in or relating to well abandonment and slot recovery
GB2584281A (en) * 2019-05-24 2020-12-02 Ardyne Holdings Ltd Improvements in or relating to well abandonment and slot recovery

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GB2611955A (en) 2023-04-19
NO346136B1 (en) 2022-03-14
WO2021262011A1 (en) 2021-12-30
GB2611955B (en) 2024-02-21
GB202400257D0 (en) 2024-02-21
NO20200757A1 (en) 2021-12-27
GB202301154D0 (en) 2023-03-15

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