EP2565372B1 - Apparatus and method for penetrating cement surrounding a tubular - Google Patents
Apparatus and method for penetrating cement surrounding a tubular Download PDFInfo
- Publication number
- EP2565372B1 EP2565372B1 EP11179388.1A EP11179388A EP2565372B1 EP 2565372 B1 EP2565372 B1 EP 2565372B1 EP 11179388 A EP11179388 A EP 11179388A EP 2565372 B1 EP2565372 B1 EP 2565372B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tubular
- bore
- interior
- fluid
- insert
- 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.)
- Not-in-force
Links
- 239000004568 cement Substances 0.000 title claims description 30
- 238000000034 method Methods 0.000 title claims description 17
- 230000000149 penetrating effect Effects 0.000 title claims description 6
- 239000012530 fluid Substances 0.000 claims description 55
- 230000015572 biosynthetic process Effects 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 15
- 239000000126 substance Substances 0.000 claims description 10
- 230000008961 swelling Effects 0.000 claims description 7
- 238000005530 etching Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 4
- 238000005299 abrasion Methods 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 claims 1
- 230000007797 corrosion Effects 0.000 claims 1
- 238000005755 formation reaction Methods 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000002360 explosive Substances 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 229910000760 Hardened steel Inorganic materials 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000004936 stimulating effect Effects 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- E21B43/112—Perforators with extendable perforating members, e.g. actuated by fluid means
Definitions
- the present invention relates to an apparatus and a method for penetrating cement surrounding a tubular.
- a well extending through geological formations may be used for exploration and production of oil and/or gas, water production and/or in geothermal applications.
- Building a well typically involves drilling a borehole, inserting a steel casing into the wellbore and cementing the casing to the formation.
- the casing provides structural stability, for example by preventing weak rock or sand from caving into the borehole.
- the cement is set, the next section is drilled through the formation in the extension of the existing casing.
- a liner is then hung off of the casing, and cemented to the formation. This process can be repeated until the well has reached the desired depth.
- a well may also comprise sections of uncased or open borehole, sections of casing or lining with sand screens, sections surrounded by gravel packs etc, as is well known in the art.
- sections of casing or lining with sand screens, sections surrounded by gravel packs etc are well known in the art.
- a casing and a liner will be collectively referred to as a tubular in the following description and accompanying claims. In other words, no distinction will be made between a casing and a liner in the following.
- the steel tubular and cement In order to allow fluid flow from the formation into the wellbore, the steel tubular and cement must be penetrated at depths corresponding to a layer containing oil and/or gas, an aquifer or the like, hereinafter referred to as a production zone.
- the perforation has been performed by using an explosive charge in a device known as a perforation gun.
- explosives require special handling according to strict safety rules, they may damage the formation and they have other disadvantages. Hence, there is a tendency to avoid explosives whenever possible.
- the production zone may be 'stimulated' in order to facilitate the fluid flow.
- Techniques for stimulating a zone involve hydraulic fracturing, in which hydraulic pressure is applied to force open cracks in the rock and insert sand or other granular material into the cracks. When the fracturing pressure is removed, the granular material remains in the cracks and keeps them open.
- Known stimulation techniques also include injection of acid, solvents, surfactants etc in order to reduce the viscosity of the production fluid or the adhesion of production fluid to the surrounding rock.
- US 2,855,049 teaches an apparatus for sealing a borehole casing or liner in a borehole.
- the purpose of the present invention is to overcome the problems of the prior art, while keeping the benefits of well known techniques and equipment, in particular to penetrate the cement surrounding a tubular cemented to a formation without using explosives.
- an apparatus for penetrating cement surrounding a tubular cemented to a formation comprises a bore through the tubular wall and an intermediate fluid channel disposed within an insert within the bore.
- an inner sleeve may be disposed on the interior surface of the tubular wall, the inner sleeve being movable between a closed position wherein fluid connection between the interior of the tubular and the bore is prevented, and an open position wherein fluid connection between the interior of the tubular and the bore is allowed.
- the bore through the tubular wall (200) may be provided in a direction perpendicular to the tubular wall.
- the insert is a piston assembly movably disposed in the bore, the piston assembly comprising a hardened tip at an outer end and a piston at an inner end, and the fluid channel being provided from the piston to the vicinity of the tip.
- the apparatus comprises a substance capable of swelling when a liquid is added thereto, the swelling substance being disposed between the piston and an interior wall, and the interior wall comprising ports that are opened or closed by the inner sleeve.
- the invention concerns a method for penetrating cement surrounding a tubular cemented to a formation, according to claim 7.
- the method comprising the steps of: providing a fluid from an interior of the tubular through an intermediate fluid channel, the fluid being capable of removing cement and/or material from an insert surrounding the fluid channel.
- the method further comprises the step of forcing a hardened tip from the tubular wall into the cement with sufficient force to cause a groove and/or cracks in the cement before providing the fluid.
- the groove and/or cracks provide a larger area of attack for the fluid.
- Forcing the hardened tip into the cementing may involve applying hydraulic pressure from the interior of the tubular on a piston rigidly connected to the tip.
- Forcing the hardened tip into the cementing may also involve opening a fluid channel from the interior of the tubular to an expandable substance arranged to exert a force on the piston.
- Providing the fluid may involve providing an abrasive fluid or providing at least one chemical capable of etching cement and/or the material of the insert.
- the method further comprises prior to providing the fluid, providing an inner sleeve on an interior surface of the tubular wall, and moving the inner sleeve from a closed position wherein fluid connection between the interior of the tubular and the bore is prevented, to an open position wherein fluid connection between the interior of the tubular and the bore is allowed.
- Figure 1 illustrates an embodiment of an apparatus to penetrate the cement 300 surrounding a tubular (200) cemented to a formation (400).
- a bore 10 extends through the tubular wall 200.
- the bore extends through the tubular wall 200in a direction perpendicular to the wall, i.e. radially with respect to the tubular.
- the bore 10 may also extend through the tubular wall 200 in a sloping direction.
- the bore is provided with a removable seal (140) near an exterior surface of the tubular.
- An intermediate fluid channel 102 within an insert 100 essentially provides a fluid path through the wall of the tubular.
- the diameter of the intermediate fluid channel is considerably less than the diameter of the bore. This may be useful in applications where a number of ports are to be opened, e.g. by a drop ball, and a small pressure difference is desired over each port corresponding to the bore 10.
- an abrasive fluid for example slurry for hydraulic fracturing, can abrade the insert in order to fully open the port or bore.
- the bore could be lined 101 with a hard material, e.g. tungsten carbide (WC), ceramic material or hardened steel, and the insert would be manufactured form a softer material, for example a softer steel or other metal e.g. aluminium. This method can also be used to penetrate the cement around the casing as illustrated in figure 1 .
- An inner sleeve 120 is disposed on the interior surface of the tubular wall 200.
- the inner sleeve is movable between a closed position wherein fluid connection between the interior of the tubular and the bore is prevented, and an open position wherein fluid connection between the interior of the tubular and the bore is allowed.
- the sleeve is provided to close the bore during run in, and may be rotated around, or alternatively displaced axially along, the axis of rotation of the tubular. In both cases, at least one opening in the inner sleeve is aligned with the bore in the open position, and not aligned in the closed, or run-in, position shown in the figures 1-3 .
- Fig. 2 illustrates a preferred embodiment of the apparatus, wherein the insert 100 is a piston assembly disposed in the bore 10.
- the bore is provided with a removable seal (140) near an exterior surface of the tubular.
- the piston assembly can be displaced in the axial direction of the bore 10, which corresponds to the radial direction of the tubular.
- hydraulic pressure may work in the interior surface of the piston 110, i.e. to the left on Fig. 2 .
- the pressure and piston area can be adapted such that the piston assembly is forced radially outwards with respect to the tubular, i.e. towards the right hand side of Fig. 2 , such that the hardened tip 105 penetrates the seal 140 and enters a distance into the cement 300.
- the piston assembly comprises a hardened tip 105 at an outer end rigidly connected to a piston 110 at an inner end of the bore.
- the tip can be made of a ceramic material, as ceramics tend to withstand compression forces quite well even if they are brittle and break easily when subjected to tensile forces.
- the tip 105 can be made of hardened steel or another suitable material.
- the tip is sufficiently hard to penetrate a distance into the cement and provide a groove and/or cracks.
- Typical compressive strength of the cement is from about 20,68 MPa (3000 psi) and above, and the tip is forced into the cement with sufficient force in order for the pressure against the cement under the tip to become larger than the compressive strength.
- the enlarged surface of the groove and/or cracks provides an area of attack for an etchant or abrasive fluid as described below.
- This fluid is supplied from the interior of the tubular (to the left on figures 1-3 ) through the fluid channel(s) 102, which are provided through the piston assembly to the vicinity of the tip 105.
- the seal 140 in the figures 1-3 is intended to protect the bore during run in. It can be provided as a lid as illustrated. Alternatively, the seal 140 can be a portion of the tubular wall 200 with reduced thickness, or a plug made from a suitable material such as a plastic or resin. In particular, the tip 105 in figs. 2 and 3 should penetrate seal 140 without requiring too much force, so the seal 140 should just be able to withstand the forces it may encounter during run-in.
- Figure 3 resembles figure 2 in that it comprises a piston assembly within a housing.
- a swelling substance 150 is disposed between the piston 110 and an interior wall 103.
- the interior wall 103 is provided in the bore 10 facing the inner sleeve 120.
- the interior wall 103 has ports or fluid channels 102 as discussed above.
- the ports 102 may be opened by the inner sleeve 120, such that liquid can be supplied to the swelling material.
- the swelling material will exert equal forces in opposite directions on the interior wall 103 and the piston 110.
- the interior wall 103 must be able to withstand the forces required to drive the tip 105 into the cement 300.
- a fluid is provided from the interior of the tubular through an intermediate fluid channel 102.
- the fluid must be capable of removing cement and/or material from an insert surrounding the fluid channel.
- a slurry containing sand or ceramic particles such as a slurry used for hydraulic fracturing, is known to abrade metal inserts and cement.
- the amount of abraded material is proportional to the area in which the abrasive fluid is allowed to work. Hence, a small groove tends to be enlarged by the abrasion. Similarly, cracked cement tends to be abraded more easily than solid cement.
- the fluid may be corrosive or etching.
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- 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)
- Earth Drilling (AREA)
Description
- The present invention relates to an apparatus and a method for penetrating cement surrounding a tubular.
- A well extending through geological formations may be used for exploration and production of oil and/or gas, water production and/or in geothermal applications. Building a well typically involves drilling a borehole, inserting a steel casing into the wellbore and cementing the casing to the formation. The casing provides structural stability, for example by preventing weak rock or sand from caving into the borehole. When the cement is set, the next section is drilled through the formation in the extension of the existing casing. A liner is then hung off of the casing, and cemented to the formation. This process can be repeated until the well has reached the desired depth. A well may also comprise sections of uncased or open borehole, sections of casing or lining with sand screens, sections surrounded by gravel packs etc, as is well known in the art. However, for the purposes of the following disclosure, only wellbores with a tubular steel lining cemented to the formation are considered. Further, a casing and a liner will be collectively referred to as a tubular in the following description and accompanying claims. In other words, no distinction will be made between a casing and a liner in the following.
- In order to allow fluid flow from the formation into the wellbore, the steel tubular and cement must be penetrated at depths corresponding to a layer containing oil and/or gas, an aquifer or the like, hereinafter referred to as a production zone. Conventionally, the perforation has been performed by using an explosive charge in a device known as a perforation gun. However, explosives require special handling according to strict safety rules, they may damage the formation and they have other disadvantages. Hence, there is a tendency to avoid explosives whenever possible.
- Any time after penetration, i.e. when a fluid path is established between the formation and the interior of the well bore, the production zone may be 'stimulated' in order to facilitate the fluid flow. Techniques for stimulating a zone involve hydraulic fracturing, in which hydraulic pressure is applied to force open cracks in the rock and insert sand or other granular material into the cracks. When the fracturing pressure is removed, the granular material remains in the cracks and keeps them open. Known stimulation techniques also include injection of acid, solvents, surfactants etc in order to reduce the viscosity of the production fluid or the adhesion of production fluid to the surrounding rock.
-
US 2,855,049 teaches an apparatus for sealing a borehole casing or liner in a borehole. The purpose of the present invention is to overcome the problems of the prior art, while keeping the benefits of well known techniques and equipment, in particular to penetrate the cement surrounding a tubular cemented to a formation without using explosives. - According to the present invention, in a first aspect, this is accomplished by an apparatus for penetrating cement surrounding a tubular cemented to a formation, according to claim 1. The apparatus comprises a bore through the tubular wall and an intermediate fluid channel disposed within an insert within the bore. In an embodiment, an inner sleeve may be disposed on the interior surface of the tubular wall, the inner sleeve being movable between a closed position wherein fluid connection between the interior of the tubular and the bore is prevented, and an open position wherein fluid connection between the interior of the tubular and the bore is allowed. The bore through the tubular wall (200) may be provided in a direction perpendicular to the tubular wall.
- The insert is a piston assembly movably disposed in the bore, the piston assembly comprising a hardened tip at an outer end and a piston at an inner end, and the fluid channel being provided from the piston to the vicinity of the tip. In a further embodiment, the apparatus comprises a substance capable of swelling when a liquid is added thereto, the swelling substance being disposed between the piston and an interior wall, and the interior wall comprising ports that are opened or closed by the inner sleeve.
- In another aspect, the invention concerns a method for penetrating cement surrounding a tubular cemented to a formation, according to claim 7. The method comprising the steps of: providing a fluid from an interior of the tubular through an intermediate fluid channel, the fluid being capable of removing cement and/or material from an insert surrounding the fluid channel.
- The method further comprises the step of forcing a hardened tip from the tubular wall into the cement with sufficient force to cause a groove and/or cracks in the cement before providing the fluid. The groove and/or cracks provide a larger area of attack for the fluid. Forcing the hardened tip into the cementing may involve applying hydraulic pressure from the interior of the tubular on a piston rigidly connected to the tip. Forcing the hardened tip into the cementing may also involve opening a fluid channel from the interior of the tubular to an expandable substance arranged to exert a force on the piston. Providing the fluid may involve providing an abrasive fluid or providing at least one chemical capable of etching cement and/or the material of the insert.
- The method further comprises prior to providing the fluid, providing an inner sleeve on an interior surface of the tubular wall, and moving the inner sleeve from a closed position wherein fluid connection between the interior of the tubular and the bore is prevented, to an open position wherein fluid connection between the interior of the tubular and the bore is allowed.
- Further embodiments and advantages of the invention will be apparent from the accompanying claims.
- Embodiments of the invention will now be described with reference to the followings drawings, where:
-
Fig. 1 is a schematic cross sectional view of an embodiment of the invention; -
Fig. 2 is a schematic cross sectional view of a further embodiment of the invention; -
Fig. 3 is a schematic cross sectional view of an alternative embodiment of the invention; - The drawings are schematic and intended to illustrate the principles of the present invention. Hence, the figures are not to scale, and a number of details are omitted for the sake of clarity.
-
Figure 1 illustrates an embodiment of an apparatus to penetrate thecement 300 surrounding a tubular (200) cemented to a formation (400). Abore 10 extends through thetubular wall 200. Infigure 1 the bore extends through the tubular wall 200in a direction perpendicular to the wall, i.e. radially with respect to the tubular. However, thebore 10 may also extend through thetubular wall 200 in a sloping direction. The bore is provided with a removable seal (140) near an exterior surface of the tubular. - An
intermediate fluid channel 102 within aninsert 100 essentially provides a fluid path through the wall of the tubular. However, the diameter of the intermediate fluid channel is considerably less than the diameter of the bore. This may be useful in applications where a number of ports are to be opened, e.g. by a drop ball, and a small pressure difference is desired over each port corresponding to thebore 10. Later, an abrasive fluid, for example slurry for hydraulic fracturing, can abrade the insert in order to fully open the port or bore. In such an application, the bore could be lined 101 with a hard material, e.g. tungsten carbide (WC), ceramic material or hardened steel, and the insert would be manufactured form a softer material, for example a softer steel or other metal e.g. aluminium. This method can also be used to penetrate the cement around the casing as illustrated infigure 1 . - An
inner sleeve 120 is disposed on the interior surface of thetubular wall 200. The inner sleeve is movable between a closed position wherein fluid connection between the interior of the tubular and the bore is prevented, and an open position wherein fluid connection between the interior of the tubular and the bore is allowed. The sleeve is provided to close the bore during run in, and may be rotated around, or alternatively displaced axially along, the axis of rotation of the tubular. In both cases, at least one opening in the inner sleeve is aligned with the bore in the open position, and not aligned in the closed, or run-in, position shown in thefigures 1-3 . -
Fig. 2 illustrates a preferred embodiment of the apparatus, wherein theinsert 100 is a piston assembly disposed in thebore 10. The bore is provided with a removable seal (140) near an exterior surface of the tubular. The piston assembly can be displaced in the axial direction of thebore 10, which corresponds to the radial direction of the tubular. When theinner sleeve 120 is moved to its open position, hydraulic pressure may work in the interior surface of thepiston 110, i.e. to the left onFig. 2 . It is readily seen that the pressure and piston area can be adapted such that the piston assembly is forced radially outwards with respect to the tubular, i.e. towards the right hand side ofFig. 2 , such that thehardened tip 105 penetrates theseal 140 and enters a distance into thecement 300. - To achieve this, the piston assembly comprises a
hardened tip 105 at an outer end rigidly connected to apiston 110 at an inner end of the bore. The tip can be made of a ceramic material, as ceramics tend to withstand compression forces quite well even if they are brittle and break easily when subjected to tensile forces. Alternatively, thetip 105 can be made of hardened steel or another suitable material. The tip is sufficiently hard to penetrate a distance into the cement and provide a groove and/or cracks. Typical compressive strength of the cement is from about 20,68 MPa (3000 psi) and above, and the tip is forced into the cement with sufficient force in order for the pressure against the cement under the tip to become larger than the compressive strength. The enlarged surface of the groove and/or cracks provides an area of attack for an etchant or abrasive fluid as described below. This fluid is supplied from the interior of the tubular (to the left onfigures 1-3 ) through the fluid channel(s) 102, which are provided through the piston assembly to the vicinity of thetip 105. - The
seal 140 in thefigures 1-3 is intended to protect the bore during run in. It can be provided as a lid as illustrated. Alternatively, theseal 140 can be a portion of thetubular wall 200 with reduced thickness, or a plug made from a suitable material such as a plastic or resin. In particular, thetip 105 infigs. 2 and3 should penetrate seal 140 without requiring too much force, so theseal 140 should just be able to withstand the forces it may encounter during run-in. -
Figure 3 resemblesfigure 2 in that it comprises a piston assembly within a housing. InFig. 3 , however, a swellingsubstance 150 is disposed between thepiston 110 and aninterior wall 103. Theinterior wall 103 is provided in thebore 10 facing theinner sleeve 120. Theinterior wall 103 has ports orfluid channels 102 as discussed above. Theports 102 may be opened by theinner sleeve 120, such that liquid can be supplied to the swelling material. When liquid is supplied, the swelling material will exert equal forces in opposite directions on theinterior wall 103 and thepiston 110. Hence, theinterior wall 103 must be able to withstand the forces required to drive thetip 105 into thecement 300. - In all of the embodiments above, a fluid is provided from the interior of the tubular through an
intermediate fluid channel 102. The fluid must be capable of removing cement and/or material from an insert surrounding the fluid channel. A slurry containing sand or ceramic particles, such as a slurry used for hydraulic fracturing, is known to abrade metal inserts and cement. The amount of abraded material is proportional to the area in which the abrasive fluid is allowed to work. Hence, a small groove tends to be enlarged by the abrasion. Similarly, cracked cement tends to be abraded more easily than solid cement. Alternatively, the fluid may be corrosive or etching. For example, it is well known that NaOH etches aluminium, and hence could be used to remove aluminium inserts. Similarly, HCl could be used for etching thecement 300 and/or stimulate a limestone formation. Obviously, different fluids could be used at separate times. The choice of suitable materials and chemicals are known in the art, and hence left to the skilled person. - While the invention has been described with reference to certain embodiments, the scope of the invention is defined by the following claims.
Claims (10)
- Apparatus for penetrating cement (300) surrounding a tubular (200) cemented to a formation (400), the apparatus comprising:- a bore (10) through the tubular wall (200), and- an intermediate fluid channel (102) in an insert (100) within the bore, and beingcharacterized by:an inner sleeve (120) disposed on an interior surface of the tubular wall (200), the inner sleeve being movable between a closed position wherein fluid connection between the interior of the tubular and the bore (10) is prevented, and an open position wherein fluid connection between the interior of the tubular and the bore (10) is allowed, and where the insert (100) is a piston assembly disposed in the bore (10) and movable in an axial direction of the bore (10), the piston assembly comprising a hardened tip (105) at an outer end and a piston (110) at an inner end, and the fluid channel (102) being provided through the piston assembly to the vicinity of the tip (105).
- Apparatus according to claim 1, wherein the bore (10) through the tubular wall (200) is in a direction perpendicular to the tubular wall (200).
- Apparatus according to claim 1 or 2, wherein the bore is provided with a removable seal (140) near an exterior surface of the tubular.
- Apparatus according to any one of the preceding claims, wherein the insert (100) within the bore (10) is erodible by an abrasive and/or etching fluid.
- Apparatus according to any one of the preceding claims, wherein the insert is disposed in a housing (101) made from a material that is more resistant to abrasion and/or corrosion than the material of the tubular wall (200).
- Apparatus according to any one of the preceding claims, further comprising a substance (150) capable of swelling when a liquid is added thereto, the swelling substance (150) being disposed between the piston (110) and an interior wall (103), and the interior wall (103) comprising ports (102) that are opened or closed by the inner sleeve (120).
- Method for penetrating cement (300) surrounding a tubular (200) cemented to a formation (400), the method comprising the following steps:- providing a bore (10) through the tubular wall (200),- providing a fluid from an interior of the tubular through an intermediate fluid channel (102) being arranged in an insert (100) within the bore (10), the fluid being capable of removing cement and/or material from the insert (100) surrounding the fluid channel, wherein the method, before the step of providing the fluid, is furthercharacterized by the steps of:- providing an inner sleeve (120) on an interior surface of the tubular wall (200),- moving the inner sleeve (120) from a closed position wherein fluid connection between the interior of the tubular and the bore (10) is prevented, to an open position wherein fluid connection between the interior of the tubular and the bore (10) is allowed, and- forcing a hardened tip (105) from the interior of the tubular wall (200) into the cement with sufficient force to cause a groove and/or cracks in the cement where the insert (100) is a piston assembly (110) disposed in the bore (10), and the fluid channel (102) is provided through the piston assembly (110) to the vicinity of the tip (105), andwhere the step of forcing the hardened tip (105) into the cementing involves applying hydraulic pressure from the interior of the tubular on the piston (110) rigidly connected to the tip (105).
- Method according to claim 7, wherein the step of forcing the hardened tip into the cementing involves opening the fluid channel (102) from the interior of the tubular to an expandable substance (150) being disposed between the piston (110) and an interior wall (103) and being arranged to exert a force on the piston (110), wherein the interior wall (103) comprises ports (102) that are opened or closed by the inner sleeve (120).
- Method according to claim 7 or 8, wherein the step of providing the fluid involves providing an abrasive and/or etching fluid.
- Method according to any one of the claims 7 to 9, wherein the step of providing the fluid involves providing at least one chemical capable of etching cement and/or the material of the insert.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11179388.1A EP2565372B1 (en) | 2011-08-30 | 2011-08-30 | Apparatus and method for penetrating cement surrounding a tubular |
PL11179388T PL2565372T3 (en) | 2011-08-30 | 2011-08-30 | Apparatus and method for penetrating cement surrounding a tubular |
DK11179388.1T DK2565372T3 (en) | 2011-08-30 | 2011-08-30 | Apparatus and method for penetrating cement surrounding a pipe |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11179388.1A EP2565372B1 (en) | 2011-08-30 | 2011-08-30 | Apparatus and method for penetrating cement surrounding a tubular |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2565372A1 EP2565372A1 (en) | 2013-03-06 |
EP2565372B1 true EP2565372B1 (en) | 2014-02-26 |
Family
ID=44674360
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11179388.1A Not-in-force EP2565372B1 (en) | 2011-08-30 | 2011-08-30 | Apparatus and method for penetrating cement surrounding a tubular |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2565372B1 (en) |
DK (1) | DK2565372T3 (en) |
PL (1) | PL2565372T3 (en) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2855049A (en) * | 1954-11-12 | 1958-10-07 | Zandmer Solis Myron | Duct-forming devices |
US3120268A (en) * | 1960-02-19 | 1964-02-04 | Nat Petroleum Corp Ltd | Apparatus for providing ducts through casing in a well |
US20100230100A1 (en) * | 2009-03-13 | 2010-09-16 | Reservoir Management Inc. | Plug for a Perforated Liner and Method of Using Same |
-
2011
- 2011-08-30 PL PL11179388T patent/PL2565372T3/en unknown
- 2011-08-30 DK DK11179388.1T patent/DK2565372T3/en active
- 2011-08-30 EP EP11179388.1A patent/EP2565372B1/en not_active Not-in-force
Also Published As
Publication number | Publication date |
---|---|
DK2565372T3 (en) | 2014-05-12 |
PL2565372T3 (en) | 2014-08-29 |
EP2565372A1 (en) | 2013-03-06 |
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