NO20220153A1 - A method for cutting off a tubular in a subterranean well and removing the cutt-off section of the tubular from the well - Google Patents
A method for cutting off a tubular in a subterranean well and removing the cutt-off section of the tubular from the well Download PDFInfo
- Publication number
- NO20220153A1 NO20220153A1 NO20220153A NO20220153A NO20220153A1 NO 20220153 A1 NO20220153 A1 NO 20220153A1 NO 20220153 A NO20220153 A NO 20220153A NO 20220153 A NO20220153 A NO 20220153A NO 20220153 A1 NO20220153 A1 NO 20220153A1
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- Norway
- Prior art keywords
- tool
- tubular
- spear
- valve
- cut
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 17
- 239000013049 sediment Substances 0.000 claims description 2
- 239000012530 fluid Substances 0.000 claims 25
- 238000004891 communication Methods 0.000 claims 9
- 238000004873 anchoring Methods 0.000 claims 4
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 1
- 229910052601 baryte Inorganic materials 0.000 description 1
- 239000010428 baryte Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- Knives (AREA)
Description
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 stiring, 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 inveniton
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 knvies 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 fo the pull tool is about 1.2 m, 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.
Claims (19)
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 (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 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,
j) 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 claim 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 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 (162) in said valve tool (16), said electronic control unit (162), on the basis of said control signal (S), 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 3, wherein the control signal (S) is transmitted to the receiver (R) of the electronic control unit (162) along a wired pipe – work string (20).
5. 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 (162) via the fluid of the through-bore (19) of the work string (20).
6. Method according to claim 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 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 (162) comprises a a rotation sensor (RS) for tool rotation parameters.
8. 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. 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. 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. 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 (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 claim 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 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 (131) 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).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO20220153A NO20220153A1 (en) | 2022-02-01 | 2022-02-01 | A method for cutting off a tubular in a subterranean well and removing the cutt-off section of the tubular from the well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO20220153A NO20220153A1 (en) | 2022-02-01 | 2022-02-01 | A method for cutting off a tubular in a subterranean well and removing the cutt-off section of the tubular from the well |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NO20220153A1 true NO20220153A1 (en) | 2021-12-27 |
Family
ID=80857203
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO20220153A NO20220153A1 (en) | 2022-02-01 | 2022-02-01 | A method for cutting off a tubular in a subterranean well and removing the cutt-off section of the tubular from the well |
Country Status (1)
| Country | Link |
|---|---|
| NO (1) | NO20220153A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20190162033A1 (en) * | 2017-11-29 | 2019-05-30 | Baker Hughes, A Ge Company, Llc | Bottom Hole Assembly for Cutting and Pulling a Tubular |
| GB2574647A (en) * | 2018-06-14 | 2019-12-18 | Ardyne Holdings Ltd | Improvements In Or Relating To Well Abandonment And Slot Recovery |
| GB2576010A (en) * | 2018-08-01 | 2020-02-05 | Ardyne Holdings Ltd | Improvements in or relating to well abandonment and slot recovery |
-
2022
- 2022-02-01 NO NO20220153A patent/NO20220153A1/en unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20190162033A1 (en) * | 2017-11-29 | 2019-05-30 | Baker Hughes, A Ge Company, Llc | Bottom Hole Assembly for Cutting and Pulling a Tubular |
| GB2574647A (en) * | 2018-06-14 | 2019-12-18 | Ardyne Holdings Ltd | Improvements In Or Relating To Well Abandonment And Slot Recovery |
| GB2576010A (en) * | 2018-08-01 | 2020-02-05 | Ardyne Holdings Ltd | Improvements in or relating to well abandonment and slot recovery |
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