WO2011059338A1 - Method and device for closing a well in the ground - Google Patents

Method and device for closing a well in the ground Download PDF

Info

Publication number
WO2011059338A1
WO2011059338A1 PCT/NO2010/000404 NO2010000404W WO2011059338A1 WO 2011059338 A1 WO2011059338 A1 WO 2011059338A1 NO 2010000404 W NO2010000404 W NO 2010000404W WO 2011059338 A1 WO2011059338 A1 WO 2011059338A1
Authority
WO
WIPO (PCT)
Prior art keywords
cutting tool
well
casing
cutting
accordance
Prior art date
Application number
PCT/NO2010/000404
Other languages
French (fr)
Inventor
Svein H SØLVERSEN
Per Lund
Original Assignee
Norse Cutting & Abandonment As
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Norse Cutting & Abandonment As filed Critical Norse Cutting & Abandonment As
Priority to US13/508,917 priority Critical patent/US20120305251A1/en
Priority to BR112012011112A priority patent/BR112012011112A2/en
Priority to AU2010318780A priority patent/AU2010318780A1/en
Priority to EP10830246.4A priority patent/EP2499329A4/en
Publication of WO2011059338A1 publication Critical patent/WO2011059338A1/en

Links

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
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/11—Perforators; Permeators
    • E21B43/114—Perforators using direct fluid action on the wall to be perforated, e.g. abrasive jets
    • 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
    • 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
    • E21B29/06—Cutting windows, e.g. directional window cutters for whipstock operations
    • 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
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
    • E21B33/134—Bridging plugs

Definitions

  • This invention relates to a method of closing a well in the ground. More particularly, it relates to a method of closing a well in the ground, the well being provided with casing.
  • the invention also includes a device for practising the method.
  • each pressure-bearing zone it is usual to place at least two independent barriers including a suitable plugging material which is arranged to seal the well.
  • a suitable plugging material which is arranged to seal the well.
  • the casing material is machined away by means of a hard-metal blade which is arranged on a pipe string.
  • the pipe string is connected to a drilling vessel or an installation with the necessary drilling equipment.
  • Chips from the machining must be transported up to the surface because the chips, which may be magnetic and may include relatively long chip coils, prevent tools from passing the portion if they are not removed. Machining the longitudinal portion away from the casing by means of the prior art may take several days and is a very expensive operation.
  • the invention has for its object to remedy or reduce at least one of the drawbacks of the prior art .
  • a cutting tool is meant, in this connection, a tool which is arranged to make cuts through the pipe wall as opposed to machining tools which are arranged to remove pipe material by chipping.
  • the method may include cutting the longitudinal portion by means of a fluid jet.
  • a fluid jet By using a fluid jet, the further induction of magnetic forces into the pipe wall pieces is avoided and the pipe wall pieces may be allowed to fall down and remain in the well.
  • the pipe wall pieces may be carried to the surface, for example by means of a mag- net .
  • the method may further include the preparatory actions of :
  • the method may further include connecting the cutting tool to the surface by means of coiled tubing.
  • the method thereby makes it possible for the well to be shut down without the use of a drilling rig.
  • the method can be practised by means of a cutting tool for cutting the longitudinal portion of a casing, the cutting tool including a nozzle head rotatable around its longitudinal axis, with at least one nozzle, the nozzle head being connected to coiled tubing, the coiled tubing extending to the surface and the cutting tool being connected to the casing by means of an anchor.
  • the anchor may be a fixed anchor or a rolling anchor and the cutting tool may be provided with an actuator for moving the nozzle head axially.
  • the actuator may be used for axial movement of the nozzle head during the cutting operation. If a rolling anchor is used, the coiled tubing can be moved axially in the well without the use of a separate actuator.
  • the cutting head may be provided with a pendulum nozzle.
  • the pendulum nozzle which is of a design known per se, is arranged to pivot the fluid jet while the nozzle head is kept stationary.
  • the cutting tool may be provided with a change-over valve which is arranged to selectably connect a fluid flow to a desired nozzle.
  • the fluid flow may be directed to a cutting nozzle during the cutting operation and then directed to a cleaning nozzle during a subsequent cleaning operation.
  • the method and device according to the invention enable a considerable reduction in the time spent on closing petroleum wells while, at the same time, considerably simpler equipment may be used compared with the prior art.
  • the invention thereby provides for a substantial reduction in costs connected with closing and finishing off wells.
  • Figure 1 shows schematically a well which has been prepared for a cutting operation according to the invention
  • Figure 2 shows schematically a section, on a larger scale, of a cutting head
  • Figure 3 shows a cutting pattern in the wall of the casing
  • Figure 4 shows schematically, on a smaller scale, a well after a plug has been set .
  • the reference numeral 1 indicates a petroleum well in a formation 2.
  • An inner casing 4, a second-inner casing 6 and other casings 8 are cemented into a borehole 10 by means of a cementation mass 12.
  • a seal 14 seals between the inner casing 4 and the second- inner casing 6.
  • the well 1 is shown after preparatory work has been carried out, such as filling the lower portion of the inner casing 4 with filler 16, cutting the inner casing 4 and removing the upper portion, not shown, of the inner casing 4 from the well 1.
  • Coiled tubing 18 with a cutting tool 20 fitted is in the well 1, the cutting tool 20 being positioned and held fixed in the second-inner casing 6 by means of an anchor 22.
  • the cutting tool 20 includes a tool housing 24 with necessary components known per se, not shown, for controlling the cutting operation.
  • An actuator 26 is arranged to move a ro- tatable nozzle head 28 in the longitudinal direction of the well 1.
  • the nozzle head 28 includes a change-over valve 30 for selectably directing pressure fluid which is supplied via an actuator channel 32 from the coiled tubing 18 to a cutting nozzle 34 or a cleaning nozzle 36, see figure 2.
  • the change-over valve 30 may be a so-called sequence valve which changes its position every time the fluid pressure is relieved.
  • the cutting may be started by fluid containing abrasive material flowing to the cutting nozzle 34 at relatively high pressure via the coiled tubing 18 and the change-over valve 30.
  • the nozzle head 28 is brought to move the cutting nozzle 34 along a predetermined path giving, for example, the cutting path 38 in the pipe wall 40 of the second-inner casing 6 as it is shown in figure 3.
  • pipe wall pieces 44 are formed from the longitudinal portion 46 of the second- inner casing 6.
  • the part of the cementation mass 12 that may be behind the longitudinal portion 46 of the second-inner casing 6 is also removed by means of fluid jets from the nozzles 34, 36 of the nozzle head 28.
  • the coiled tubing 18 and the cutting tool 20 are pulled from the well 1, after which a plug 48 is set against the formation 2 in the longitudinal portion 46 in a manner known per se, see figure 4.
  • a plug 48 is set against the formation 2 in the longitudinal portion 46 in a manner known per se, see figure 4.
  • a rubber type plug 48 is shown. A skilled person will understand that any suitable plug will be usable.
  • the longitudinal portion 46 may be chosen in a location in which two or more casings 6, 8, one outside another, will have to be cut away to expose the formation 2.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
  • Earth Drilling (AREA)

Abstract

A method and device for closing a well (1) in a formation (2) in the ground in which casing (4, 6, 8) is arranged, the method including: - moving a cutting tool (20) down into the well (1); - removing a longitudinal portion (46) of the casing (4, 6, 8) by cutting the longitudinal portion (46) into pipe wall pieces (44); - removing the cutting tool (20); and - setting a plug (48) against the formation (2) in the longitudinal portion (46) from which the casing (4, 6, 8) has been removed.

Description

METHOD AND DEVICE FOR CLOSING A WELL IN THE GROUND
This invention relates to a method of closing a well in the ground. More particularly, it relates to a method of closing a well in the ground, the well being provided with casing. The invention also includes a device for practising the method.
When the production from a well in the ground, typically a petroleum well, has been terminated, it is necessary to close the well in a way that protects against future outflow of well fluid from the well, among other things.
Above each pressure-bearing zone it is usual to place at least two independent barriers including a suitable plugging material which is arranged to seal the well. In some cases it is necessary to remove a section in the longitudinal direction of a casing for a barrier or a plug to be placed against the formation wall.
According to the prior art, the casing material is machined away by means of a hard-metal blade which is arranged on a pipe string. The pipe string is connected to a drilling vessel or an installation with the necessary drilling equipment. Chips from the machining must be transported up to the surface because the chips, which may be magnetic and may include relatively long chip coils, prevent tools from passing the portion if they are not removed. Machining the longitudinal portion away from the casing by means of the prior art may take several days and is a very expensive operation.
The invention has for its object to remedy or reduce at least one of the drawbacks of the prior art .
The object is achieved in accordance with the invention through the features which are specified in the description below and in the claims that follow.
A method is provided for closing a well in a formation in the ground, wherein casing is arranged, and wherein the method includes :
- moving a cutting tool down into the well;
- removing a longitudinal portion of the casing by cutting the longitudinal portion into pipe wall pieces;
- removing the cutting tool; and
- setting a plug against the formation in the longitudinal portion from which the casing has been removed.
By a cutting tool is meant, in this connection, a tool which is arranged to make cuts through the pipe wall as opposed to machining tools which are arranged to remove pipe material by chipping.
By cutting the longitudinal portion into pipe wall pieces, the production of voluminous chips is avoided while at the same time the pipe wall pieces are relatively easy to handle.
Further, the method may include cutting the longitudinal portion by means of a fluid jet. By using a fluid jet, the further induction of magnetic forces into the pipe wall pieces is avoided and the pipe wall pieces may be allowed to fall down and remain in the well. If desired, the pipe wall pieces may be carried to the surface, for example by means of a mag- net .
The method may further include the preparatory actions of :
- filling the lower portion of the well with filler;
- cutting an inner casing at a lower position in the well than the position at which the longitudinal portion is located; and
- removing the upper portion of the inner casing.
The method may further include connecting the cutting tool to the surface by means of coiled tubing. The method thereby makes it possible for the well to be shut down without the use of a drilling rig.
The method can be practised by means of a cutting tool for cutting the longitudinal portion of a casing, the cutting tool including a nozzle head rotatable around its longitudinal axis, with at least one nozzle, the nozzle head being connected to coiled tubing, the coiled tubing extending to the surface and the cutting tool being connected to the casing by means of an anchor.
The anchor may be a fixed anchor or a rolling anchor and the cutting tool may be provided with an actuator for moving the nozzle head axially.
In an embodiment in which the anchor is fixed, the actuator may be used for axial movement of the nozzle head during the cutting operation. If a rolling anchor is used, the coiled tubing can be moved axially in the well without the use of a separate actuator.
In a further embodiment the cutting head may be provided with a pendulum nozzle. The pendulum nozzle, which is of a design known per se, is arranged to pivot the fluid jet while the nozzle head is kept stationary. The cutting tool may be provided with a change-over valve which is arranged to selectably connect a fluid flow to a desired nozzle. For example, the fluid flow may be directed to a cutting nozzle during the cutting operation and then directed to a cleaning nozzle during a subsequent cleaning operation.
The method and device according to the invention enable a considerable reduction in the time spent on closing petroleum wells while, at the same time, considerably simpler equipment may be used compared with the prior art. The invention thereby provides for a substantial reduction in costs connected with closing and finishing off wells.
In what follows is described an example of a preferred embodiment which is visualized in the accompanying drawings, in which:
Figure 1 shows schematically a well which has been prepared for a cutting operation according to the invention;
Figure 2 shows schematically a section, on a larger scale, of a cutting head;
Figure 3 shows a cutting pattern in the wall of the casing;
and
Figure 4 shows schematically, on a smaller scale, a well after a plug has been set .
In the drawings the reference numeral 1 indicates a petroleum well in a formation 2. An inner casing 4, a second-inner casing 6 and other casings 8 are cemented into a borehole 10 by means of a cementation mass 12.
A seal 14 seals between the inner casing 4 and the second- inner casing 6. In figure 1 the well 1 is shown after preparatory work has been carried out, such as filling the lower portion of the inner casing 4 with filler 16, cutting the inner casing 4 and removing the upper portion, not shown, of the inner casing 4 from the well 1.
Coiled tubing 18 with a cutting tool 20 fitted is in the well 1, the cutting tool 20 being positioned and held fixed in the second-inner casing 6 by means of an anchor 22.
The cutting tool 20 includes a tool housing 24 with necessary components known per se, not shown, for controlling the cutting operation. An actuator 26 is arranged to move a ro- tatable nozzle head 28 in the longitudinal direction of the well 1.
In this preferred embodiment, the nozzle head 28 includes a change-over valve 30 for selectably directing pressure fluid which is supplied via an actuator channel 32 from the coiled tubing 18 to a cutting nozzle 34 or a cleaning nozzle 36, see figure 2.
The change-over valve 30 may be a so-called sequence valve which changes its position every time the fluid pressure is relieved.
When the cutting tool 20 is positioned in the well 1, the cutting may be started by fluid containing abrasive material flowing to the cutting nozzle 34 at relatively high pressure via the coiled tubing 18 and the change-over valve 30. t
The nozzle head 28 is brought to move the cutting nozzle 34 along a predetermined path giving, for example, the cutting path 38 in the pipe wall 40 of the second-inner casing 6 as it is shown in figure 3. By subsequently cutting along the paths 42, pipe wall pieces 44 are formed from the longitudinal portion 46 of the second- inner casing 6.
By switching the change-over valve 30, pressure fluid is carried to the cleaning nozzle 36, whereby the pipe wall pieces 44 can be washed down or into the well 1.
The part of the cementation mass 12 that may be behind the longitudinal portion 46 of the second-inner casing 6 is also removed by means of fluid jets from the nozzles 34, 36 of the nozzle head 28.
After the well 1 has been prepared, the coiled tubing 18 and the cutting tool 20 are pulled from the well 1, after which a plug 48 is set against the formation 2 in the longitudinal portion 46 in a manner known per se, see figure 4. In the present embodiment a rubber type plug 48 is shown. A skilled person will understand that any suitable plug will be usable.
In an alternative method, not shown, the longitudinal portion 46 may be chosen in a location in which two or more casings 6, 8, one outside another, will have to be cut away to expose the formation 2.

Claims

A method of closing a well (1) in a formation (2) in the ground in which casing (4, 6, 8) is arranged, the method including:
- moving a cutting tool (20) down into the well (1) ;
- removing a longitudinal portion (46) of the casing (4, 6, 8);
- setting a plug (48) against the formation (2) in the longitudinal portion (46) from which the casing (4, 6, 8) has been removed, c h a r a c t e r i z e d i n that the method further includes cutting the longitudinal portion (46) of the casing (4, 6, 8) into pipe wall pieces (44) .
The method in accordance with claim 1, c h a r a c t e r i z e d i n that the method further includes cutting the longitudinal portion (46) by means of a fluid jet.
The method in accordance with claim 1, c ha r a c t e r i z e d i n that the method further includes letting the pipe wall pieces (44) remain in the well (1) .
The method in accordance with claim 1, c h a r a c t e r i z e d i n that the method further includes the preparatory actions of :
- filling the lower portion of the well (1) with filler (16);
- cutting an inner casing (4) at a lower position in the well (1) than the position at which the longitudinal portion (46) is located; and
- removing the upper portion of the inner casing (4) .
5. The method in accordance with claim 1, c ha r a c t e r i z e d i n that the method further includes connecting the cutting tool (20) to the surface by means of coiled tubing (18) .
6. A cutting tool (20) for practising the method according to claim 1, c h a r a c t e r i z e d i n that the cutting tool (20) includes a nozzle head (28) ro- tatable around its longitudinal axis, with at least one nozzle (34, 36), the nozzle head (28) being connected to coiled tubing (18) , the coiled tubing (18) extending to the surface, and the cutting tool (20) being connected to the casing (4, 6, 8) by means of ai anchor (22) .
7. The cutting tool (20) in accordance with claim 6,
c h a r a c t e r i z e d i n that the anchor (22) is a rolling anchor.
8. The cutting tool (20) in accordance with claim 6,
c h a r a c t e r i z e d i n that the cutting tool (20) is provided with an actuator (26) for moving the nozzle head (28) axially.
9. The cutting tool (20) in accordance with claim 6,
c h a r a c t e r i z e d i n that the nozzle head (28) is provided with a pendulum nozzle.
10. The cutting tool (20) in accordance with claim 6,
c ha r a c t e r i z e d i n that the cutting tool (20) is provided with a change-over valve (30) which is arranged to selectably connect a fluid flow to a desired nozzle (34, 36) .
PCT/NO2010/000404 2009-11-10 2010-11-08 Method and device for closing a well in the ground WO2011059338A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US13/508,917 US20120305251A1 (en) 2009-11-10 2010-11-08 Method and device for closing a well in the ground
BR112012011112A BR112012011112A2 (en) 2009-11-10 2010-11-08 method and device for closing a well in the ground
AU2010318780A AU2010318780A1 (en) 2009-11-10 2010-11-08 Method and device for closing a well in the ground
EP10830246.4A EP2499329A4 (en) 2009-11-10 2010-11-08 Method and device for closing a well in the ground

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20093308A NO332901B1 (en) 2009-11-10 2009-11-10 Method and apparatus for closing a well in the ground
NO20093308 2009-11-10

Publications (1)

Publication Number Publication Date
WO2011059338A1 true WO2011059338A1 (en) 2011-05-19

Family

ID=43991812

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2010/000404 WO2011059338A1 (en) 2009-11-10 2010-11-08 Method and device for closing a well in the ground

Country Status (6)

Country Link
US (1) US20120305251A1 (en)
EP (1) EP2499329A4 (en)
AU (1) AU2010318780A1 (en)
BR (1) BR112012011112A2 (en)
NO (1) NO332901B1 (en)
WO (1) WO2011059338A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013085621A1 (en) * 2011-12-06 2013-06-13 Exxonmobil Upstream Research Company Method for setting a balanced cement plug in a wellbore
EP2780537A4 (en) * 2011-11-15 2016-06-29 Leif Invest As Apparatus and method for cutting and pulling of casing
US20180100373A1 (en) * 2015-04-22 2018-04-12 Welltec A/S Downhole tool string for plug and abandonment by cutting

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO339191B1 (en) 2013-09-06 2016-11-14 Hydra Systems As Method of isolating a permeable zone in an underground well
NO336249B1 (en) 2014-02-18 2015-06-29 Well Technology As Hydraulic cutting tool, system and method for controlled hydraulic cutting through a pipe wall in a well, as well as applications of the cutting tool and system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0451058A1 (en) * 1990-04-05 1991-10-09 Schlumberger Limited Method and apparatus for discarding a tubing in an access well to a salt cavity for gas storage
GB2305683A (en) * 1993-06-19 1997-04-16 Philip Head Method of abandoning a well
US6478088B1 (en) * 1998-05-04 2002-11-12 Norse Cutting & Abandonment A/S Method for the formation of a plug in a petroleum well
US20050263282A1 (en) * 2002-08-14 2005-12-01 Steven Jeffrey Well abandonment apparatus

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5667010A (en) * 1995-03-21 1997-09-16 Steelhead Reclamation Ltd. Process and plug for well abandonment
US7527092B2 (en) * 2004-11-12 2009-05-05 Alberta Energy Partners Method and apparatus for jet-fluid abrasive cutting
NO20093545A1 (en) * 2009-12-17 2011-06-20 Norse Cutting & Abandonment As Method and apparatus for closing a well in the ground

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0451058A1 (en) * 1990-04-05 1991-10-09 Schlumberger Limited Method and apparatus for discarding a tubing in an access well to a salt cavity for gas storage
GB2305683A (en) * 1993-06-19 1997-04-16 Philip Head Method of abandoning a well
US6478088B1 (en) * 1998-05-04 2002-11-12 Norse Cutting & Abandonment A/S Method for the formation of a plug in a petroleum well
US20050263282A1 (en) * 2002-08-14 2005-12-01 Steven Jeffrey Well abandonment apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2780537A4 (en) * 2011-11-15 2016-06-29 Leif Invest As Apparatus and method for cutting and pulling of casing
WO2013085621A1 (en) * 2011-12-06 2013-06-13 Exxonmobil Upstream Research Company Method for setting a balanced cement plug in a wellbore
US20180100373A1 (en) * 2015-04-22 2018-04-12 Welltec A/S Downhole tool string for plug and abandonment by cutting
US10724328B2 (en) * 2015-04-22 2020-07-28 Welltec A/S Downhole tool string for plug and abandonment by cutting

Also Published As

Publication number Publication date
NO20093308A1 (en) 2011-05-11
EP2499329A4 (en) 2016-08-03
EP2499329A1 (en) 2012-09-19
AU2010318780A1 (en) 2012-05-31
NO332901B1 (en) 2013-01-28
US20120305251A1 (en) 2012-12-06
BR112012011112A2 (en) 2016-07-05

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