CA2299685C - Installing a scrolled resilient sheet alongside the inner surface of a fluid conduit - Google Patents
Installing a scrolled resilient sheet alongside the inner surface of a fluid conduit Download PDFInfo
- Publication number
- CA2299685C CA2299685C CA002299685A CA2299685A CA2299685C CA 2299685 C CA2299685 C CA 2299685C CA 002299685 A CA002299685 A CA 002299685A CA 2299685 A CA2299685 A CA 2299685A CA 2299685 C CA2299685 C CA 2299685C
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- CA
- Canada
- Prior art keywords
- sheet
- resilient sheet
- scrolled
- conduit
- resilient
- 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.)
- Expired - Fee Related
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/02—Subsoil filtering
- E21B43/10—Setting of casings, screens, liners or the like in wells
- E21B43/103—Setting of casings, screens, liners or the like in wells of expandable casings, screens, liners, or the like
- E21B43/108—Expandable screens or perforated liners
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B29/10—Reconditioning of well casings, e.g. straightening
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/02—Subsoil filtering
- E21B43/10—Setting of casings, screens, liners or the like in wells
- E21B43/103—Setting of casings, screens, liners or the like in wells of expandable casings, screens, liners, or the like
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
- F16L55/162—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe
- F16L55/163—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a ring, a band or a sleeve being pressed against the inner surface of the pipe
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49718—Repairing
- Y10T29/49732—Repairing by attaching repair preform, e.g., remaking, restoring, or patching
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
- Y10T29/49863—Assembling or joining with prestressing of part
- Y10T29/4987—Elastic joining of parts
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
- Y10T29/49863—Assembling or joining with prestressing of part
- Y10T29/4987—Elastic joining of parts
- Y10T29/49872—Confining elastic part in socket
Abstract
A scrolled resilient sheet (3) is installed against the inner surface (4) of a fluid conduit (1) using a carrier tool (5) from which a resilient sheet having an average thickness more than 2 mm and an elastic or pseudoelastic recoverable strain of at least 0.6 % is released so that the sheet expands with an expansion force which is sufficiently high to allow the sheet to press itself into place alongside the inner surface of the conduit and to remain in place after installation.
Description
I I
INSTALLING A SCROLLED RESILIENT SHEET ALONGSIDE THE INNER
SURFACE OF A FLUID CONDUIT
Background of the Invention The invention relates to a method for installing a scrolled resilient sheet alongside the inner surface of a fluid conduit.
It is known from US patent specifications 4,501,327 and 5,040,283 to scroll a sheet around a carrier tool and then move the carrier tool carrying the scrolled sheet through the conduit towards a location where the resi-lient sheet is to be installed, whereupon the sheet is released from the carrier tool and allowed to expand towards the inner surface of the conduit.
US patent specification 5,040,283 employs a sheet made of a memory metal which expands as a result of a temperature increase. A drawback of this method is that memory metals are expensive and are not readily available in large sheets.
US patent specification 4,501,327 discloses the use of spring steel or aluminium as a resilient material, which materials have an elastic strain which is 0.55% or less (0.2% for aluminium) and that a suitable thickness for the sheet material is approximately 3/64 inch 1.2 mm).
In this known method the resilient material is pressed against the wall of the conduit when the carrier tool is pulled back through the expanded sheet.
Drawbacks of this known method are that a relatively thin sheet material is used which can be easily damaged and which has a resiliency which is only sufficient to unscroll the sheet but which does not induce the sheet to press itse'_f into place alor_gside the inner wa7-l of the conduit so that a=inal pressing sten is still zequ_red.
It is believed that the low wall thickr_ess of the knowr~ a'_uminitun or spring st.eel sreets and the ;zlatively low expansion force are associated with the low elastic stra.in capacity of the :taterials used.
I t 1.s aI: ob~ ect of the ;oresent invention to e'_iri.inatc these drawbacks and ~.o provide a:~ethad foY _nstalling a scrollcd wes_lient sheet alonasic:e the inne= surface of a l0 fluid conduit which allows the use cf a relatively thick and robust sheet which is noz easily damaged after _r_stallation and which does not _eql:._re the sten of gressing --he sheet alongside t:e wall. of the ccndu'_t by means of ar, ex:,ansioP_ tooi.
~ r Summarv of the Invention Toward mroviding these and cthe~: advantages the mei:hod according to the present inYrention employs a resilient sheet which has an average wall thickness of at least 2~un and ar_ e:asiric or pse"udoelastic reco verable 20, stra:.n of at least 0.61. so as to induce t hle sc_ollzd sheet to expand with ar_ exDa.nsion force wnicn is suf-fi.c_er_tly h_gh to alicw the sheet to press 7 tself in zc ;:~lace alongside the inr.er surface of the conau_t during installat_on w_t:out the assistance of a press44..ng de.ice 25 and to rema:r. -n place ayver installation.
When used in this specificacion the ternt elastic strai-n refers to the yLeld st=ess-Young'smodulus ratio for materials which have a yield poir_t, like many ca_bon steels have, or -he p=cof stress-'_'oung' s*_nodulus ratio 30 fo, materials which do not have a yiei~ld point. Tf the elastic strain is exoressed as a percentage then sawd ratio's axe to be multiplied by a faczor of 100.
Preferably the resilient shee- :as an s,verace wall thickness of at least 3 rmn and is rade of a~itan 35 al+Gy Ilavi nC an ei- t.:... IT1Cdu_U.s 1"io-- :TG?'e than 115.000 Y-~~c'l, and a proof stress of at least 825 MPa, so that the elastic strain is more than 0.75%.
It is also preferred that the resilient sheet material has an average wall thickness of at least 4 mm and is made of a Ti-6A1-4V alloy.
The sheet may be a rectangular sheet without perforations which is used to provide a seal or a patch of an area where the wall of the conduit has been ruptured, damaged or eroded. Alternatively the fluid conduit is formed by an inflow region of a hydrocarbon production well and the sheet is perforated at regular intervals and is installed alongside the inner surface of the wellbo.re to serve as a wellscreen.
If the sheet is to be scrolled to a very small diameter, for example if it is to be moved through constrictions in the conduit, then it can be beneficial to use a pseudoelastic alloy as sheet material. Suitable pseudoelastic alloys are Ti-16V-3A1-6Zr and TiNi.
In one broad aspect, there is provided a method for installing a scrolled resilient sheet alongside the inner surface of a fluid conduit, the method comprising the steps of: scrolling a resilient sheet and securing the scrolled sheet to a carrier tool such that the carrier tool carrying the scrolled sheet is moveable through the conduit;
moving the carrier tool to a location in the conduit where the resilient sheet is to be installed; and releasing the resilient sheet from the carrier tool thereby allowing the resilient sheet to expand towards an inner surface of the conduit, wherein the resilient sheet has an average wall thickness of at least 2 mm and an elastic strain or a pseudoelastic recoverable strain of at least 0.6% so as to induce the scrolled sheet to expand with an expansion force 3a which is sufficiently high to allow the sheet to press itself into place alongside the inner surface of the conduit during installation and to remain in place after installation.
Brief Description of the Drawings These and further features, objects and advantages of the method according to the invention will be more fully appreciated by reference to the following detailed description of a preferred embodiment of the invention which should be read in conjunction with the accompanying drawings in which:
Fig. 1 is a schematic side elevational view of a resilient sheet which is being placed inside a conduit in the form of a vertical underground borehole; and Fig. 2 is a side view of an unscrolled resilient sheet which comprises circumferential slots so that the sheet can be used as a wellscreen.
Detailed Description of the Preferred Embodiment Referring now to Fig. 1 there is shown a vertical wellbore 1 traversing an underground formation 2 and a resilient sheet 3 which is unscrolling itself against the wall 4 of the wellbore 1.
The sheet 3 has been lowered into the wellbore 1 using a carrier tool 5 which is suspended on a wireline 6.
The carrier tool 5 and wireline 6 are shown in the drawing in dotted lines.
Before lowering the carrier tool 5 into the wellbore 1 the sheet 3 is scrolled around the tool 5 and fixed to the tool 5 using tack welds and/or clips. When the tool has arrived at the location where the sheet 3 is to be installed the tack welds and/or clips are released, for example using explosive devices which shear off the tack welds and/or clips.
The resilient sheet 3 has a thickness of at least 2 mm and an elastic strain of at least 0.6% which allows the sheet to develop a high expansion force so that it expands and presses itself into place against the wall 4 of the wellbore 1 and to remain in place after installation even if the pore pressure of the surrounding formation 2 is higher than the fluid pressure within the wellbore 1.
When seen in circumferential direction, the ends of the resilient sheet 3 form flaps 7 where the sheet 3 has a reduced wall thickness. The circumferential length of the sheet 3 will be chosen slightly larger than the circumference of the wall 4 of the weilbore 1 such that the flaps 7 will at least partly overlap if the resilient sheet 3 has been expanded against said wall 4. Thus the flaps 7 will create a shut-off for leaks and will create a smooth and almost seamless internal bore of the expanded sheet 3. To improve the sealing a further sleeve (not shown) of cellular rubber may be placed outside the outer flap 7. This sleeve should be bonded along an axial line, but not around the circumference of the flap 7.
SURFACE OF A FLUID CONDUIT
Background of the Invention The invention relates to a method for installing a scrolled resilient sheet alongside the inner surface of a fluid conduit.
It is known from US patent specifications 4,501,327 and 5,040,283 to scroll a sheet around a carrier tool and then move the carrier tool carrying the scrolled sheet through the conduit towards a location where the resi-lient sheet is to be installed, whereupon the sheet is released from the carrier tool and allowed to expand towards the inner surface of the conduit.
US patent specification 5,040,283 employs a sheet made of a memory metal which expands as a result of a temperature increase. A drawback of this method is that memory metals are expensive and are not readily available in large sheets.
US patent specification 4,501,327 discloses the use of spring steel or aluminium as a resilient material, which materials have an elastic strain which is 0.55% or less (0.2% for aluminium) and that a suitable thickness for the sheet material is approximately 3/64 inch 1.2 mm).
In this known method the resilient material is pressed against the wall of the conduit when the carrier tool is pulled back through the expanded sheet.
Drawbacks of this known method are that a relatively thin sheet material is used which can be easily damaged and which has a resiliency which is only sufficient to unscroll the sheet but which does not induce the sheet to press itse'_f into place alor_gside the inner wa7-l of the conduit so that a=inal pressing sten is still zequ_red.
It is believed that the low wall thickr_ess of the knowr~ a'_uminitun or spring st.eel sreets and the ;zlatively low expansion force are associated with the low elastic stra.in capacity of the :taterials used.
I t 1.s aI: ob~ ect of the ;oresent invention to e'_iri.inatc these drawbacks and ~.o provide a:~ethad foY _nstalling a scrollcd wes_lient sheet alonasic:e the inne= surface of a l0 fluid conduit which allows the use cf a relatively thick and robust sheet which is noz easily damaged after _r_stallation and which does not _eql:._re the sten of gressing --he sheet alongside t:e wall. of the ccndu'_t by means of ar, ex:,ansioP_ tooi.
~ r Summarv of the Invention Toward mroviding these and cthe~: advantages the mei:hod according to the present inYrention employs a resilient sheet which has an average wall thickness of at least 2~un and ar_ e:asiric or pse"udoelastic reco verable 20, stra:.n of at least 0.61. so as to induce t hle sc_ollzd sheet to expand with ar_ exDa.nsion force wnicn is suf-fi.c_er_tly h_gh to alicw the sheet to press 7 tself in zc ;:~lace alongside the inr.er surface of the conau_t during installat_on w_t:out the assistance of a press44..ng de.ice 25 and to rema:r. -n place ayver installation.
When used in this specificacion the ternt elastic strai-n refers to the yLeld st=ess-Young'smodulus ratio for materials which have a yield poir_t, like many ca_bon steels have, or -he p=cof stress-'_'oung' s*_nodulus ratio 30 fo, materials which do not have a yiei~ld point. Tf the elastic strain is exoressed as a percentage then sawd ratio's axe to be multiplied by a faczor of 100.
Preferably the resilient shee- :as an s,verace wall thickness of at least 3 rmn and is rade of a~itan 35 al+Gy Ilavi nC an ei- t.:... IT1Cdu_U.s 1"io-- :TG?'e than 115.000 Y-~~c'l, and a proof stress of at least 825 MPa, so that the elastic strain is more than 0.75%.
It is also preferred that the resilient sheet material has an average wall thickness of at least 4 mm and is made of a Ti-6A1-4V alloy.
The sheet may be a rectangular sheet without perforations which is used to provide a seal or a patch of an area where the wall of the conduit has been ruptured, damaged or eroded. Alternatively the fluid conduit is formed by an inflow region of a hydrocarbon production well and the sheet is perforated at regular intervals and is installed alongside the inner surface of the wellbo.re to serve as a wellscreen.
If the sheet is to be scrolled to a very small diameter, for example if it is to be moved through constrictions in the conduit, then it can be beneficial to use a pseudoelastic alloy as sheet material. Suitable pseudoelastic alloys are Ti-16V-3A1-6Zr and TiNi.
In one broad aspect, there is provided a method for installing a scrolled resilient sheet alongside the inner surface of a fluid conduit, the method comprising the steps of: scrolling a resilient sheet and securing the scrolled sheet to a carrier tool such that the carrier tool carrying the scrolled sheet is moveable through the conduit;
moving the carrier tool to a location in the conduit where the resilient sheet is to be installed; and releasing the resilient sheet from the carrier tool thereby allowing the resilient sheet to expand towards an inner surface of the conduit, wherein the resilient sheet has an average wall thickness of at least 2 mm and an elastic strain or a pseudoelastic recoverable strain of at least 0.6% so as to induce the scrolled sheet to expand with an expansion force 3a which is sufficiently high to allow the sheet to press itself into place alongside the inner surface of the conduit during installation and to remain in place after installation.
Brief Description of the Drawings These and further features, objects and advantages of the method according to the invention will be more fully appreciated by reference to the following detailed description of a preferred embodiment of the invention which should be read in conjunction with the accompanying drawings in which:
Fig. 1 is a schematic side elevational view of a resilient sheet which is being placed inside a conduit in the form of a vertical underground borehole; and Fig. 2 is a side view of an unscrolled resilient sheet which comprises circumferential slots so that the sheet can be used as a wellscreen.
Detailed Description of the Preferred Embodiment Referring now to Fig. 1 there is shown a vertical wellbore 1 traversing an underground formation 2 and a resilient sheet 3 which is unscrolling itself against the wall 4 of the wellbore 1.
The sheet 3 has been lowered into the wellbore 1 using a carrier tool 5 which is suspended on a wireline 6.
The carrier tool 5 and wireline 6 are shown in the drawing in dotted lines.
Before lowering the carrier tool 5 into the wellbore 1 the sheet 3 is scrolled around the tool 5 and fixed to the tool 5 using tack welds and/or clips. When the tool has arrived at the location where the sheet 3 is to be installed the tack welds and/or clips are released, for example using explosive devices which shear off the tack welds and/or clips.
The resilient sheet 3 has a thickness of at least 2 mm and an elastic strain of at least 0.6% which allows the sheet to develop a high expansion force so that it expands and presses itself into place against the wall 4 of the wellbore 1 and to remain in place after installation even if the pore pressure of the surrounding formation 2 is higher than the fluid pressure within the wellbore 1.
When seen in circumferential direction, the ends of the resilient sheet 3 form flaps 7 where the sheet 3 has a reduced wall thickness. The circumferential length of the sheet 3 will be chosen slightly larger than the circumference of the wall 4 of the weilbore 1 such that the flaps 7 will at least partly overlap if the resilient sheet 3 has been expanded against said wall 4. Thus the flaps 7 will create a shut-off for leaks and will create a smooth and almost seamless internal bore of the expanded sheet 3. To improve the sealing a further sleeve (not shown) of cellular rubber may be placed outside the outer flap 7. This sleeve should be bonded along an axial line, but not around the circumference of the flap 7.
This is because the rubber has to stretch on unscrolling, and must therefore slide over the flap 7 which does not stretch. The interface may be lubricated.
In the assembly shown in Fig. 1 the flaps 7 are not taken into account for determination o.f the average wall thickness of the sheet 3. In accordance with the invention the average wall thickness of the sheet 3 is at least 2 mm whereas the wall thickness of the flaps 7 may be less than 2 mm. Thus, when used in this specification, the term average wall thickness of the sheet denotes the wall thickness of any parts of the sheet 3 other than the flaps 7 and locations where the sheet 3 is perforated.
The maximum average wall thickness T of a sheet 3 that will fully elastically unscroll can be estimated on the basis of the formula:
T/d - T/D < Y/E
where: d = the scrolled diameter of the sheet D = the relaxed diameter of the sheet Y = the yield or proof stress of the sheet material; and E = the elastic modulus of the sheet material.
By virtue of its high elastic strain, viz. at least 0.6% resulting from the combination of low elastic or Young's modulus (preferably not more than 115.000 MPa) and high proof stress (preferably at least 825 MPa) the sheet according to the invention can have larger wall thickness than conventional resilients sheets. Titanium alloys having an elastic modulus less than 150.000 MPa are particularly suitable for use in the sheet according to the invention. A Ti alloy grade 5 sheet having an average wall thickness of 4 mm can be used for a 7"
(17.5 mm) casing repair. A Ti-22V-4Al alloy sheet having an elastic modulus of 82 MPa and thermomechanically processed to achieve a proof stress of 720 MPa or greater ..~.~.~..
In the assembly shown in Fig. 1 the flaps 7 are not taken into account for determination o.f the average wall thickness of the sheet 3. In accordance with the invention the average wall thickness of the sheet 3 is at least 2 mm whereas the wall thickness of the flaps 7 may be less than 2 mm. Thus, when used in this specification, the term average wall thickness of the sheet denotes the wall thickness of any parts of the sheet 3 other than the flaps 7 and locations where the sheet 3 is perforated.
The maximum average wall thickness T of a sheet 3 that will fully elastically unscroll can be estimated on the basis of the formula:
T/d - T/D < Y/E
where: d = the scrolled diameter of the sheet D = the relaxed diameter of the sheet Y = the yield or proof stress of the sheet material; and E = the elastic modulus of the sheet material.
By virtue of its high elastic strain, viz. at least 0.6% resulting from the combination of low elastic or Young's modulus (preferably not more than 115.000 MPa) and high proof stress (preferably at least 825 MPa) the sheet according to the invention can have larger wall thickness than conventional resilients sheets. Titanium alloys having an elastic modulus less than 150.000 MPa are particularly suitable for use in the sheet according to the invention. A Ti alloy grade 5 sheet having an average wall thickness of 4 mm can be used for a 7"
(17.5 mm) casing repair. A Ti-22V-4Al alloy sheet having an elastic modulus of 82 MPa and thermomechanically processed to achieve a proof stress of 720 MPa or greater ..~.~.~..
can be used for the same repair with an average wall thickness of 5 mm.
Further, some metastable beta-titanium alloys such as Ti-16V-3A1-6Zr with appropriate thermomechanical processing exhibit pseudoelasticity to an extent that would permit an average wall thickness between 11 and 13 mm. TiNi would permit even greater wall thickness.
These pseudoelastic alloys can also be used to permit scrolling to a smaller diameter when the sheet has an average wall thickness of several millimetres to allow installation through constrictions, such as through-tubing operations in an oil or gas production well.
The large average wall thickness of the sheet 3 is not only useful for creating a robust scroll but also for enhancing the spring force with which the sheet 3 unscrolls and presses itself against the wall 4 of the wellbore 1.
Referring now to Fig. 2 there is shown a view of an unscrolled sheet according to the invention where the sheet forms a well screen 10 which contains elongate circumferential slots 11 that are arranged in sub-stantially parallel rows both axially and circumferen-tially across the screen 10, with no stagger between the rows of slots. The perforations are also tapered (not shown) in radial direction so that the smallest width of the perforations is located at the outer surface of the sheet when the sheet is scrolled.
The tapered shape of the slots 11 serves to avoid that sand particles which may enter the slots 11 could become stuck partway in the slots 11.
Circumferential unstaggered slots 11 are preferred to holes or non-circumferential slots because the operation of scrolling and unscrolling can be performed with minimal stress concentrations in the screen material, while retaining maximum spring force, strength and stiffness.
The scrolled wellscreen shown in Fig. 2 can also be covered, preferably at the outer surface, with filter material. Optionally the filter material can be separated from the surface of the screen 10 by a drainage layer, for example coarse woven wire, so that the fluid passing through the filter layer not immediate opposite a slot 11 in the scroll can flow to the slot 11 through the drainage layer.
The filter and drainage layers can be made of scrolled sheets of filter and drainage material which surround the screen 10. The sheets of the screen 10 and of the filter and drainage layers can be provided with end flaps where the sheet has reduced thickness in the same way as shown in Fig. 1 in order to create a seamless screen when the assembly of the screen 10 and surrounding filter and drainage layers unscrolls itself against the wellbore or perforated production liner. The wellscreen can thus press itself directly against the wellbore or perforated production liner, without an intervening annulus, thus obviating the need for gravel packing, thereby reducing the risk of erosion and stabilizing the formation.
If desired, the overlapping ends of the sheet or screen may be maintained in a fixed position relative to each other once the sheet has been expanded and installed within the conduit or wellbore. This may be achieved by welding or bonding the ends to each other, or by pro-viding the overlapping ends with axial locking grooves or with ratchet profiles that allow unscrolling but prevent re-scrolling of the sheet or screen.
Further, some metastable beta-titanium alloys such as Ti-16V-3A1-6Zr with appropriate thermomechanical processing exhibit pseudoelasticity to an extent that would permit an average wall thickness between 11 and 13 mm. TiNi would permit even greater wall thickness.
These pseudoelastic alloys can also be used to permit scrolling to a smaller diameter when the sheet has an average wall thickness of several millimetres to allow installation through constrictions, such as through-tubing operations in an oil or gas production well.
The large average wall thickness of the sheet 3 is not only useful for creating a robust scroll but also for enhancing the spring force with which the sheet 3 unscrolls and presses itself against the wall 4 of the wellbore 1.
Referring now to Fig. 2 there is shown a view of an unscrolled sheet according to the invention where the sheet forms a well screen 10 which contains elongate circumferential slots 11 that are arranged in sub-stantially parallel rows both axially and circumferen-tially across the screen 10, with no stagger between the rows of slots. The perforations are also tapered (not shown) in radial direction so that the smallest width of the perforations is located at the outer surface of the sheet when the sheet is scrolled.
The tapered shape of the slots 11 serves to avoid that sand particles which may enter the slots 11 could become stuck partway in the slots 11.
Circumferential unstaggered slots 11 are preferred to holes or non-circumferential slots because the operation of scrolling and unscrolling can be performed with minimal stress concentrations in the screen material, while retaining maximum spring force, strength and stiffness.
The scrolled wellscreen shown in Fig. 2 can also be covered, preferably at the outer surface, with filter material. Optionally the filter material can be separated from the surface of the screen 10 by a drainage layer, for example coarse woven wire, so that the fluid passing through the filter layer not immediate opposite a slot 11 in the scroll can flow to the slot 11 through the drainage layer.
The filter and drainage layers can be made of scrolled sheets of filter and drainage material which surround the screen 10. The sheets of the screen 10 and of the filter and drainage layers can be provided with end flaps where the sheet has reduced thickness in the same way as shown in Fig. 1 in order to create a seamless screen when the assembly of the screen 10 and surrounding filter and drainage layers unscrolls itself against the wellbore or perforated production liner. The wellscreen can thus press itself directly against the wellbore or perforated production liner, without an intervening annulus, thus obviating the need for gravel packing, thereby reducing the risk of erosion and stabilizing the formation.
If desired, the overlapping ends of the sheet or screen may be maintained in a fixed position relative to each other once the sheet has been expanded and installed within the conduit or wellbore. This may be achieved by welding or bonding the ends to each other, or by pro-viding the overlapping ends with axial locking grooves or with ratchet profiles that allow unscrolling but prevent re-scrolling of the sheet or screen.
Claims (9)
1. A method for installing a scrolled resilient sheet alongside the inner surface of a fluid conduit, the method comprising the steps of:
- scrolling a resilient sheet and securing the scrolled sheet to a carrier tool such that the carrier tool carrying the scrolled sheet is moveable through the conduit;
- moving the carrier tool to a location in the conduit where the resilient sheet is to be installed; and - releasing the resilient sheet from the carrier tool thereby allowing the resilient sheet to expand towards an inner surface of the conduit, wherein the resilient sheet has an average wall thickness of at least 2 mm and an elastic strain or a pseudoelastic recoverable strain of at least 0.6% so as to induce the scrolled sheet to expand with an expansion force which is sufficiently high to allow the sheet to press itself into place alongside the inner surface of the conduit during installation and to remain in place after installation.
- scrolling a resilient sheet and securing the scrolled sheet to a carrier tool such that the carrier tool carrying the scrolled sheet is moveable through the conduit;
- moving the carrier tool to a location in the conduit where the resilient sheet is to be installed; and - releasing the resilient sheet from the carrier tool thereby allowing the resilient sheet to expand towards an inner surface of the conduit, wherein the resilient sheet has an average wall thickness of at least 2 mm and an elastic strain or a pseudoelastic recoverable strain of at least 0.6% so as to induce the scrolled sheet to expand with an expansion force which is sufficiently high to allow the sheet to press itself into place alongside the inner surface of the conduit during installation and to remain in place after installation.
2. The method of claim 1, wherein the resilient sheet has an average wall thickness of at least 3 mm and is made of a titanium alloy having an elastic modulus equal or lower than 115.000 MPa and a proof stress of at least 825 MPa.
3. The method of claim 2, wherein the scrolled resilient sheet has an average wall thickness of at least 4 mm and is made of a Ti-6Al-4V alloy.
4. The method of claim 1, wherein the fluid conduit is formed by an inflow region of hydrocarbon production well and the resilient sheet is perforated at regular intervals and is installed alongside the inner surface of the wellbore to serve as a wellscreen.
5. The method of claim 4, wherein the perforations consist of elongate circumferential slots which are arranged in substantially parallel rows both axially and circumferentially across the resilient sheet, the rows of slots being non-staggered.
6. The method of claim 4, wherein the perforations are tapered in radial direction such that the smallest width of the perforations is located at the outer surface of the resilient sheet.
7. The method of claim 1, wherein the resilient sheet has a thickness of at least 5 mm and is made of a pseudoelastic alloy.
8. The method of claim 7, wherein the alloy is solution-treated. Ti-16V-3Al-6Zr.
9. The method of claim 7, wherein the alloy is TiNi.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP97306555A EP0899420A1 (en) | 1997-08-27 | 1997-08-27 | Method for installing a scrolled resilient sheet alongside the inner surface of a fluid conduit |
| EP97306555.0 | 1997-08-27 | ||
| PCT/EP1998/005702 WO1999010622A1 (en) | 1997-08-27 | 1998-08-27 | Installing a scrolled resilient sheet alongside the inner surface of a fluid conduit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2299685A1 CA2299685A1 (en) | 1999-03-04 |
| CA2299685C true CA2299685C (en) | 2008-01-22 |
Family
ID=8229482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002299685A Expired - Fee Related CA2299685C (en) | 1997-08-27 | 1998-08-27 | Installing a scrolled resilient sheet alongside the inner surface of a fluid conduit |
Country Status (14)
| Country | Link |
|---|---|
| US (1) | US6516506B2 (en) |
| EP (2) | EP0899420A1 (en) |
| CN (1) | CN1098405C (en) |
| AU (1) | AU731733B2 (en) |
| BR (1) | BR9811370A (en) |
| CA (1) | CA2299685C (en) |
| DE (1) | DE69809443T2 (en) |
| DK (1) | DK1009909T3 (en) |
| EA (1) | EA001142B1 (en) |
| MY (1) | MY119803A (en) |
| NO (1) | NO318150B1 (en) |
| NZ (1) | NZ502643A (en) |
| OA (1) | OA11326A (en) |
| WO (1) | WO1999010622A1 (en) |
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-
1997
- 1997-08-27 EP EP97306555A patent/EP0899420A1/en not_active Withdrawn
-
1998
- 1998-08-25 MY MYPI98003880A patent/MY119803A/en unknown
- 1998-08-27 EP EP98945317A patent/EP1009909B1/en not_active Expired - Lifetime
- 1998-08-27 DK DK98945317T patent/DK1009909T3/en active
- 1998-08-27 CN CN98808569A patent/CN1098405C/en not_active Expired - Fee Related
- 1998-08-27 DE DE69809443T patent/DE69809443T2/en not_active Expired - Fee Related
- 1998-08-27 AU AU92668/98A patent/AU731733B2/en not_active Ceased
- 1998-08-27 NZ NZ502643A patent/NZ502643A/en unknown
- 1998-08-27 WO PCT/EP1998/005702 patent/WO1999010622A1/en active IP Right Grant
- 1998-08-27 BR BR9811370-4A patent/BR9811370A/en not_active IP Right Cessation
- 1998-08-27 CA CA002299685A patent/CA2299685C/en not_active Expired - Fee Related
- 1998-08-27 EA EA200000254A patent/EA001142B1/en not_active IP Right Cessation
-
2000
- 2000-02-25 NO NO20000937A patent/NO318150B1/en not_active IP Right Cessation
- 2000-02-25 OA OA1200000055A patent/OA11326A/en unknown
-
2001
- 2001-02-09 US US09/779,775 patent/US6516506B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE69809443D1 (en) | 2002-12-19 |
| WO1999010622A1 (en) | 1999-03-04 |
| NO20000937L (en) | 2000-02-25 |
| EA001142B1 (en) | 2000-10-30 |
| NO318150B1 (en) | 2005-02-07 |
| US6516506B2 (en) | 2003-02-11 |
| BR9811370A (en) | 2000-08-29 |
| CA2299685A1 (en) | 1999-03-04 |
| EP0899420A1 (en) | 1999-03-03 |
| OA11326A (en) | 2003-10-27 |
| CN1268206A (en) | 2000-09-27 |
| EA200000254A1 (en) | 2000-08-28 |
| EP1009909A1 (en) | 2000-06-21 |
| MY119803A (en) | 2005-07-29 |
| CN1098405C (en) | 2003-01-08 |
| EP1009909B1 (en) | 2002-11-13 |
| AU731733B2 (en) | 2001-04-05 |
| DE69809443T2 (en) | 2003-08-28 |
| NZ502643A (en) | 2001-06-29 |
| US20010039711A1 (en) | 2001-11-15 |
| DK1009909T3 (en) | 2003-03-03 |
| NO20000937D0 (en) | 2000-02-25 |
| AU9266898A (en) | 1999-03-16 |
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| EEER | Examination request | ||
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