CA2221789C - Connector assembly for an expandable slotted pipe - Google Patents
Connector assembly for an expandable slotted pipe Download PDFInfo
- Publication number
- CA2221789C CA2221789C CA002221789A CA2221789A CA2221789C CA 2221789 C CA2221789 C CA 2221789C CA 002221789 A CA002221789 A CA 002221789A CA 2221789 A CA2221789 A CA 2221789A CA 2221789 C CA2221789 C CA 2221789C
- Authority
- CA
- Canada
- Prior art keywords
- male
- connector assembly
- tubing
- female
- parts
- 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 - Lifetime
Links
- SRVJKTDHMYAMHA-WUXMJOGZSA-N thioacetazone Chemical compound CC(=O)NC1=CC=C(\C=N\NC(N)=S)C=C1 SRVJKTDHMYAMHA-WUXMJOGZSA-N 0.000 abstract 1
- 238000003466 welding Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/08—Casing joints
-
- 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
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
-
- 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
- E21B43/02—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
-
- 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
- E21B43/02—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
- E21B43/106—Couplings or joints therefor
-
- 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
- E21B43/02—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
-
- 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
- F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
- F16L13/14—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling
- F16L13/16—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling the pipe joint consisting of overlapping extremities having mutually co-operating collars
- F16L13/168—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling the pipe joint consisting of overlapping extremities having mutually co-operating collars for screw threaded pipes
-
- 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
- F16L37/00—Couplings of the quick-acting type
- F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
- F16L37/084—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking
- F16L37/098—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of flexible hooks
- F16L37/0985—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of flexible hooks the flexible hook extending radially inwardly from an outer part and engaging a bead, recess or the like on an inner part
Landscapes
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Earth Drilling (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
Abstract
A connector assembly for interconnecting sections of an expandable slotted tubing string (10) comprises a male part (22) and a female part (24) for mounting on the ends of respective tubing sections. Each part is slotted and adapted to co-axially engage the other part . to permit expansion of the coupled parts in a corresponding manner to the tubin g string without flaring of the coupled parts.
Description
WO 96/37680 PC'T/EP96102271 CONNECTOR ASSEMBLY FOR AN EXPANDABLE SLOTTED PIPE
This invention relates to a connector assembly for use in connecting sections of an expandable tubing string, and in particular but not exclusively for use in the connection of sections of an expandable slotted tubing (EST) string as utilised in downhole applications in the oil and gas exploration and extraction industries.
Expandable slotted tubing (EST) is used in various downhole applications. The tubing comprises lengths of tube which have been machined to create a large number of longitudinal slots. Thus, it is relatively easy to expand the tube radially outwardly by, for example, running a mandrel through the tubing. The expansion causes the slots to extend to create diamond-shaped apertures. The tubing is useful where it is desired to, for example, line a bore below a restriction without further reducing the diameter of the bore. Using conventional tubing, the oiiter diameter of the tubing must, by necessity, be of smaller diameter than the restriction, to permit the tubing to be passed through the restriction. This reduction in the bore diameter has a number of significant effects, primarily in reducing the production capabilities of the bore. Using EST, the tubing may pass through a restriction into a reamed section of bore below the restriction. The tubing may then be expanded to a diameter larger than the restriction.
EST is supplied in lengths which are, at present, made up into a string by welding the lengths to one another. This is relatively time consuming and expensive and in many situations, for example in an off-shore operation in bad weather, it may be difficult to maintain consistent weld quality. Safety problems may also arise due to the high temperatures and exposed flames or sparks . , ~ ~=
.. .
This invention relates to a connector assembly for use in connecting sections of an expandable tubing string, and in particular but not exclusively for use in the connection of sections of an expandable slotted tubing (EST) string as utilised in downhole applications in the oil and gas exploration and extraction industries.
Expandable slotted tubing (EST) is used in various downhole applications. The tubing comprises lengths of tube which have been machined to create a large number of longitudinal slots. Thus, it is relatively easy to expand the tube radially outwardly by, for example, running a mandrel through the tubing. The expansion causes the slots to extend to create diamond-shaped apertures. The tubing is useful where it is desired to, for example, line a bore below a restriction without further reducing the diameter of the bore. Using conventional tubing, the oiiter diameter of the tubing must, by necessity, be of smaller diameter than the restriction, to permit the tubing to be passed through the restriction. This reduction in the bore diameter has a number of significant effects, primarily in reducing the production capabilities of the bore. Using EST, the tubing may pass through a restriction into a reamed section of bore below the restriction. The tubing may then be expanded to a diameter larger than the restriction.
EST is supplied in lengths which are, at present, made up into a string by welding the lengths to one another. This is relatively time consuming and expensive and in many situations, for example in an off-shore operation in bad weather, it may be difficult to maintain consistent weld quality. Safety problems may also arise due to the high temperatures and exposed flames or sparks . , ~ ~=
.. .
created by a welding operation. Further, in the event of a"mis-run", requiring the welded lengths of tubing forming the EST string to be separated, the tubing must be cut, and the cut tubing cannot be reused.
It is among the objects of the present invention to provide a means of connecting sections of EST which obviates or mitigates these difficulties.
According to the present invention there is provided a connector assembly for interconnecting sections of an expandable slotted tubing string, the assembly comprising a male part and a female part formed integrally with the ends of respective tubing sections, each part being slotted and being adapted to co-axially engage the other part to permit expansion of the coupled parts in a corresponding manner to the tubing string, wherein the male and female part are interconnectable by one series of circumferentially spaced mechanical fasteners.
Preferably, the male part is formed by an end of one of the interconnected tubing sections of which the outer surface has been machined away over a selected distance and the female part is formed by an end of the other of the interconnected tubing sections of which the inner surface has been machined away over a similar distance.
In such case it is preferred that the free end of the male and female part fits within an annular groove formed at the other end of the corresponding part such that if the parts co-axially engage each other said free ends are locked in a radial sense inside said grooves to prevent flaring of said free ends when the tubing string is expanded.
AMENIDED SNEr-T
. : ~.
. .. ., ;
It is among the objects of the present invention to provide a means of connecting sections of EST which obviates or mitigates these difficulties.
According to the present invention there is provided a connector assembly for interconnecting sections of an expandable slotted tubing string, the assembly comprising a male part and a female part formed integrally with the ends of respective tubing sections, each part being slotted and being adapted to co-axially engage the other part to permit expansion of the coupled parts in a corresponding manner to the tubing string, wherein the male and female part are interconnectable by one series of circumferentially spaced mechanical fasteners.
Preferably, the male part is formed by an end of one of the interconnected tubing sections of which the outer surface has been machined away over a selected distance and the female part is formed by an end of the other of the interconnected tubing sections of which the inner surface has been machined away over a similar distance.
In such case it is preferred that the free end of the male and female part fits within an annular groove formed at the other end of the corresponding part such that if the parts co-axially engage each other said free ends are locked in a radial sense inside said grooves to prevent flaring of said free ends when the tubing string is expanded.
AMENIDED SNEr-T
. : ~.
. .. ., ;
This minimizes the possibility of the free ends flaring on expansion of the tube. Such flaring of the _ male end would create an irregularity in the tubing bore on which tools could become snagged.
i5 The slotted free ends of the parts will define fingers and in a preferred arrangement mechanical fasteners are provided for coupling the respective = overlapping fingers to one another. This prevents the ends of the parts from separating when the connected tubing is expanded. Preferably, each fastener is located substantially in the middle of a node and halfway between a pair of adjacent slots. The fasteners may be releasable, for example short screws for location in appropriate holes provided in the parts, such that the tubing may be separated in the event of a mis-run. The use of screws and the like, and the associated screw-holes, also provides a convenient means for ensuring that the parts are properly aligned.
It is therefore preferred that the mechanical fasteners consist of short screws that pass through radial holes drilled through the walls of the male and female parts and the head of each screw is sunken within a recess formed in the outer surface of the female part and the shank of each screw engages a screw thread formed in the radial hole passing through the male part.
.o;tFryrP!J0 SHEET
i5 The slotted free ends of the parts will define fingers and in a preferred arrangement mechanical fasteners are provided for coupling the respective = overlapping fingers to one another. This prevents the ends of the parts from separating when the connected tubing is expanded. Preferably, each fastener is located substantially in the middle of a node and halfway between a pair of adjacent slots. The fasteners may be releasable, for example short screws for location in appropriate holes provided in the parts, such that the tubing may be separated in the event of a mis-run. The use of screws and the like, and the associated screw-holes, also provides a convenient means for ensuring that the parts are properly aligned.
It is therefore preferred that the mechanical fasteners consist of short screws that pass through radial holes drilled through the walls of the male and female parts and the head of each screw is sunken within a recess formed in the outer surface of the female part and the shank of each screw engages a screw thread formed in the radial hole passing through the male part.
.o;tFryrP!J0 SHEET
Furthermore, the,,female part may be formed by the free end'..b~; IIe slo'fted tubing section which,_is r Yr/ ~ !! tt L,r. = ' slightly ex~ba~yidler~l trranga.ng the female part co-,r .h!
11 ( IJ( 3 i j! t a x i a l l y arouhd) +au~t + ' , ~'1 '3~, f .i= ~ +1~ a, '. 4 ' .
ti 11~ ! t,C,t, Vt~4 1i.v~l f These and o~~~a~.. !e+c~s of the present invention will now be descrila~ d~; example. with reference to :, ..,. !~~-;;; ,,_,, r,,;;~'.,~~;;,' the accomparpxyifnlq; s,, in which :
. ;:.,..:;
Figure 1 is a sectional view of a length of expandable sl-ottedi. ,tuwbing~ (EST) , shown in an expanded configuration;
Figure 2 is a sectional view on line 2-2 of Figure 1, and in additioli, sh t~.~ ;.the EST. in unexpanded con-.
figuratio4;l ~ ~~l~j~ry~~e"t~~i section of a connector "/4: :,:[(=,~(t:"'f;~ d!C;j~V17~}~ti~;i.}~('. _,r.; !.I .,. . . ..:
assembiy' "itn a preferred embodiment of the present invention, with the parts of the assembly shown separated; and Figure 4 is a half section of the connector assembly of Figure 3, showing the parts connected.
, . . .;. ., AMENDED SHEET
11 ( IJ( 3 i j! t a x i a l l y arouhd) +au~t + ' , ~'1 '3~, f .i= ~ +1~ a, '. 4 ' .
ti 11~ ! t,C,t, Vt~4 1i.v~l f These and o~~~a~.. !e+c~s of the present invention will now be descrila~ d~; example. with reference to :, ..,. !~~-;;; ,,_,, r,,;;~'.,~~;;,' the accomparpxyifnlq; s,, in which :
. ;:.,..:;
Figure 1 is a sectional view of a length of expandable sl-ottedi. ,tuwbing~ (EST) , shown in an expanded configuration;
Figure 2 is a sectional view on line 2-2 of Figure 1, and in additioli, sh t~.~ ;.the EST. in unexpanded con-.
figuratio4;l ~ ~~l~j~ry~~e"t~~i section of a connector "/4: :,:[(=,~(t:"'f;~ d!C;j~V17~}~ti~;i.}~('. _,r.; !.I .,. . . ..:
assembiy' "itn a preferred embodiment of the present invention, with the parts of the assembly shown separated; and Figure 4 is a half section of the connector assembly of Figure 3, showing the parts connected.
, . . .;. ., AMENDED SHEET
Reference is first made to Figures 1 and 2 of the drawings, which illustrate a length of expandable slotted tubing (EST) 10. In its initial configuration, the tubing 10 is simply a length of pipe in which a series of 15 longitudinal slots 12 have been machined (shown as 12a in Figure 2). Applying a radially outward force to the tubing wall, for example by passing a cone or mandrel through the tubing, causes the tube to expand such that the slots 12a become diamond shaped openings 12b.
The tubing 10 is supplied in lengths suitable for transportation and handling and these are joined to one another to create a tubular string. The connector assembly 20 as illustrated in Figures 3 and 4 of the drawings is used to connect such tubing lengths. The assembly 20 comprises a male part 22 and a female part 24. The parts 22, 24 are intended to expand in a similar manner to the tubing 10, and as such are provided with similar longitudinal slots 26.
The free end of the male part 22 is machined to form a male portion 28 having a reduced outer diameter and the free end of the female part 22 defines a corresponding female portion 30 having a reduced and enlarged inner diameter to receive the male portion 28, as will be described. Each part 22, 24 defines a respective annular groove in the form of an undercut ledge 34, 35 for engaging the free end 36, 37 of the other part which is of corresponding form. This serves to prevent the free ends of one part separating from the other part on expansion of the tubing.
AMENDED SHEET
The tubing 10 is supplied in lengths suitable for transportation and handling and these are joined to one another to create a tubular string. The connector assembly 20 as illustrated in Figures 3 and 4 of the drawings is used to connect such tubing lengths. The assembly 20 comprises a male part 22 and a female part 24. The parts 22, 24 are intended to expand in a similar manner to the tubing 10, and as such are provided with similar longitudinal slots 26.
The free end of the male part 22 is machined to form a male portion 28 having a reduced outer diameter and the free end of the female part 22 defines a corresponding female portion 30 having a reduced and enlarged inner diameter to receive the male portion 28, as will be described. Each part 22, 24 defines a respective annular groove in the form of an undercut ledge 34, 35 for engaging the free end 36, 37 of the other part which is of corresponding form. This serves to prevent the free ends of one part separating from the other part on expansion of the tubing.
AMENDED SHEET
The slots 26 in the parts 22, 24 are arranged such that the free ends 36, 37 of the parts each define fingers 40, 41, and each of these fingers defines a hole 42, 43. The holes 43 in the female part are counter-I5 sunk, whereas the holes 42 in the male part. 22 are threaded such that the fingers 40, 41 may be secured to one another using a number of short screws 44.
To connect two lengths of tubing provided with the tubing connector assembly 20, the parts 22, 24 are brought together such that the free end 36 of the male part passes inside the free end 37 of the female part.
The screws 44 are then secured in the holes 42, 43.
The desired number of tubing sections is connected in this manner to form a string and run downhole to the desired location within the bore. The tubing and the connector assemblies may then be expanded to the desired diameter. However, in the event of a mis-run, requiring the tubing to be withdrawn and disassembled, this may be achieved relatively easy by removing the screws 44.
It will be clear to those of skill in the art that the above-described embodiment is merely exemplary of the present invention, and may be subject to various modifications and improvements without departing from the scope of the invention.
AMENDED SHEU
To connect two lengths of tubing provided with the tubing connector assembly 20, the parts 22, 24 are brought together such that the free end 36 of the male part passes inside the free end 37 of the female part.
The screws 44 are then secured in the holes 42, 43.
The desired number of tubing sections is connected in this manner to form a string and run downhole to the desired location within the bore. The tubing and the connector assemblies may then be expanded to the desired diameter. However, in the event of a mis-run, requiring the tubing to be withdrawn and disassembled, this may be achieved relatively easy by removing the screws 44.
It will be clear to those of skill in the art that the above-described embodiment is merely exemplary of the present invention, and may be subject to various modifications and improvements without departing from the scope of the invention.
AMENDED SHEU
Claims (6)
1. A connector assembly for interconnecting sections of an expandable slotted tubing string, the assembly comprising a male part and a female part formed integrally with the ends of respective tubing sections, each part being slotted and being adapted to co-axially engage the other part to permit expansion of the coupled parts in a corresponding manner to the tubing string, wherein the male and female parts are interconnectable by one series of circumferentially spaced mechanical fasteners.
2. The connector assembly of claim 1, wherein the male part is formed by an end of one of the interconnected tubing sections of which the outer surface has been machined away over a selected distance and the female part is formed by an end of the other of the interconnected tubing sections of which the inner surface has been machined away over a similar distance.
3. The connector assembly of claim 2, wherein free ends of the male and female parts fit within an annular groove formed at the other end of the corresponding part such that if the parts co-axially engage each other said free ends are locked in a radial sense inside said grooves to prevent flaring of said free ends when the tubing string is expanded.
4. The connector assembly of claim 1, 2 or 3, wherein the mechanical fasteners consist of short screws that pass through radial holes drilled through the walls of the male and female parts and the head of each screw is sunken within a recess formed in the outer surface of the female part and the shank of each screw engages a screw thread formed in the radial hole passing through the male part.
5. The connector assembly of claim 1, 2, 3 or 4, wherein each fastener is located substantially in the middle of a node and halfway between a pair of adjacent slots.
6. The connector assembly of claim 1, 2, 3, 4 or 5, wherein at least some of the slots of the male and female parts of the connector are substantially aligned.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB9510465.9A GB9510465D0 (en) | 1995-05-24 | 1995-05-24 | Connector assembly |
| GB9510465.9 | 1995-05-24 | ||
| PCT/EP1996/002271 WO1996037680A1 (en) | 1995-05-24 | 1996-05-23 | Connector assembly for an expandable slotted pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2221789A1 CA2221789A1 (en) | 1996-11-28 |
| CA2221789C true CA2221789C (en) | 2007-07-17 |
Family
ID=38288310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002221789A Expired - Lifetime CA2221789C (en) | 1995-05-24 | 1996-05-23 | Connector assembly for an expandable slotted pipe |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2221789C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3546696A1 (en) * | 2018-03-26 | 2019-10-02 | Shell Internationale Research Maatschappij B.V. | String of expandable slotted tubulars and method of expanding a string of slotted tubulars |
-
1996
- 1996-05-23 CA CA002221789A patent/CA2221789C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2221789A1 (en) | 1996-11-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20160524 |