CA1205837A - Sleeve for lining a well wall and a tubular coupling therefor - Google Patents
Sleeve for lining a well wall and a tubular coupling thereforInfo
- Publication number
- CA1205837A CA1205837A CA000409924A CA409924A CA1205837A CA 1205837 A CA1205837 A CA 1205837A CA 000409924 A CA000409924 A CA 000409924A CA 409924 A CA409924 A CA 409924A CA 1205837 A CA1205837 A CA 1205837A
- Authority
- CA
- Canada
- Prior art keywords
- sleeve
- shoulder
- coupling
- section
- abutment
- 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
Links
- 230000008878 coupling Effects 0.000 title claims abstract description 49
- 238000010168 coupling process Methods 0.000 title claims abstract description 49
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 49
- 238000005242 forging Methods 0.000 claims abstract description 10
- 238000005452 bending Methods 0.000 claims abstract description 8
- 239000000306 component Substances 0.000 claims abstract 12
- 239000000463 material Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000005097 cold rolling Methods 0.000 claims 1
- 230000000295 complement effect Effects 0.000 claims 1
- 230000000875 corresponding effect Effects 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 239000012530 fluid Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009721 upset forging Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/001—Screw-threaded joints; Forms of screw-threads for such joints with conical threads
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- General Engineering & Computer Science (AREA)
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
- Earth Drilling (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
- Forging (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The present invention relates to a sleeve for lining a well wall comprising sleeve sections and tubular couplings for interconnecting the sleeve sections. The present invention includes the formation of a sleeve section by friction forging a respective coupling component to each end of a central tubular member. The coupling components are preferably components of the tubular coupling of the present invention. A tubular coupling is disclosed which comprises a male threaded section and a female threaded section. The female threaded section has a shoulder at the base of its thread and the shoulder is engaged by an abut-ment on the male threaded section, when the sections are fully engaged, to thereby provide a seal. The shoulder is under cut and the abutment is complementarily shaped where-by, upon application of a lateral bending moment to the coupling, a radial force is produced between the shoulder and abutment in order to maintain the seal. It is preferred that the threads of the male and female sections are pro-vided on respective frusto-conical surfaces and that a shoulder and abutment arrangement similar to that of com-ponents is provided at the other ends of the threads.
The present invention relates to a sleeve for lining a well wall comprising sleeve sections and tubular couplings for interconnecting the sleeve sections. The present invention includes the formation of a sleeve section by friction forging a respective coupling component to each end of a central tubular member. The coupling components are preferably components of the tubular coupling of the present invention. A tubular coupling is disclosed which comprises a male threaded section and a female threaded section. The female threaded section has a shoulder at the base of its thread and the shoulder is engaged by an abut-ment on the male threaded section, when the sections are fully engaged, to thereby provide a seal. The shoulder is under cut and the abutment is complementarily shaped where-by, upon application of a lateral bending moment to the coupling, a radial force is produced between the shoulder and abutment in order to maintain the seal. It is preferred that the threads of the male and female sections are pro-vided on respective frusto-conical surfaces and that a shoulder and abutment arrangement similar to that of com-ponents is provided at the other ends of the threads.
Description
~5~3~7 The present invention relates to a sleeve for lining a well wall and a tubular coupling therefor .
When a well is drilled, particularly for oil wells, the wall of the well is lined with a sleeve which is formed of ~ubular sect;ons which are screw-threaded together as the sleeve is inser~ed into ~he well. The tubular sections are conventionally manufactured from lengths of tubing the ends of which are upset forged and subsequently cold rolled in order to provide ; the threads for engaging one tubular section to the next.
The present invention seeks to provide an improved sleeve for lining a well wall and an improved ~ubular coupling for use in connecting together the tubular sections of the sleeve~
According to a first aspect of the present invention, there is provided a tubular coupling comprising a male threaded section and a female threaded section, the female threaded section having a shoulder at the base of the thread, the shoulder being engaged by an abutment on the male threaded section, when the sections are fully engaged, to thereby provide a seal, the shoulder being undercut and the abutment being complementar~ly shaped whereby, upon application of a lateral bending moment ~15~33~
to the coupling a radial force is produced between the shoulder and abutment in order to maintain the seal.
According to a second aspect of the present invention, there is provided a sleeve section for forming a sleeve for lining a well wall, co~prising a central tubular member having a respective coupling component friction forged to each end thereof.
Preferably, the threads of the male and female sections are provided on respective frusto-conical surfaces.
Advantageously~ ~he male threaded section is provid~d with a shoulder at the base of 'he thread and the female threaded section is provided with a complementarily shaped abutmen~
whereby, upon application of a lateral bending moment to the coupling a portion of the female threaded section abutment L5 may engage a portion of the male threaded section shoulder.
According to a further aspect of the present invention there is provided a method of manufacturing a sleeve section for forming a sleeve for lining a well wall comprising friction forging a respective coupling component with each end of a central tubular member.
Embodiments of the present invention will now be described by way of example only and with reference to the accompanying drawings, in which:
Figure 1 is a diagrammatic partial side view of the ends of two sleeve sec~ions coupled together, Figure 2 is a longitudinal sectional view of part of a tubular coupling used for connecting together sleeve sections as shown in Figure 1, Figure 3 illustrates area A of Figure 2 to an enlarged scale, and Figure 4 illustrates area B of Figure 2 to an enlarged scale.
A sleeve for lining a well wall is formed from a number of sleeve sections coupled together. The sleeve sections may be provided with either male or female couplings at both ends, în which case additional co1nponents are required for interconnecting the sections, or the sleeve sections may be provided with a female component at one end and a male component at the other end. As can be unders~ood from Figures 1 and 2, the sleeve sections 10 are formed of a central tubular member 12 having a respective coupling component secured to each end thereof. The central tubular member 12 has a female threaded ~ section 14 friction forged to one end of the cen~ral tubular member 12 and a male threaded portion 15 friction forged to the other end thereof.
~2~ r~
-- 4 ~
The male section 14 and the female section 16 may be sequentially friction forged to the central member 12 or, sJith the aid of suitable machinery, may be simultaneous~y friction forged to the central member 12. In either case, the central member 12 is held stationary and the male/female section retained in a chuck. The chuck is revolved at high speed and the male/female section and the central member 12 are brought into contact under the ac~ion of a relatively high pressure. The friction between the components is sufficient to cause the components to fuse together. A certain amount of flash may be produced at the junctions of the components and this is subsequently machined off. It has been found possible to produce friction forged adhesion between components wherein the adhesion is stronger than one of the parent materials.
The male and female sections are preformed and hence the sleeve section 10 may easily be constructed having different combinations of coupling sections. The provision of the threaded sections in the conventional manufacture of sleeve sections is burdensome because the entire sleeve section has to be manipulated and machine controlled during formation of the couplings~ Conventional manufacture becomes more onerous where specialised couplings or combinations are required and the necessary apparatus is considered to be relatively expensive and slow in operation compared ~ith the method of manufacture of the present invention.
The length of the sleeve section 10 is readily variable, since differing lengths of the central tubular member 12 are easily ~2~ 3 incorporated into the sleeve section 10.
Since the sleeve section 10 is constructed from separate components, the components need not consist of the same material, unlike conventional sleeve sections. The process of friction forging 5 enables materials such as aluminium and steel to be joined even though such joints are generally regarded as being unobtainable by known methods of welding. In the known art, if it is desired to provide couplings of a high quality material, then the entire sleeve section 10 must necessarily be formed of that material. The present invention permits a lower quality material to be used for the major, central, member 12 and a different material having the requisite qualities to be used for the coupling components 14 and 16. It is often acceptable to have a central member 12 of the sleeve section 10 fabricated from a different quality material than the coupling components 14 and 16. Th~s is due to the fact that the coupling components threadedly engage like components and are subjected to rotary torques during assembly of the sleeve sections to form a sleeve for lining a well wall~ The c~ntral member 12 is not subjected to any substantial rotary torque during assembly of the sleeve section into a sleeve. It has been found that the sleeve sections 10 of the present invention readily meet the industrial strength standards specified for such components. An additional benefit of forming the sleeve sections 10 of discrete components is that the central member 12 can be pretreated, for example OSt~37 by being provided with a coating. Such coatings may be applied for a specific purpose such as anti-corrosion. This feature can be of particular benefit when the central member 12 is fabricated of a lower quality material than the coupling sections 14 and 16.
Sleeve sections 10 of the present invention are economically desirable since they may permit the raw material cost to be reduced and permit the speed of manufacture to be improved.
The combined time for preforming the coupling sections 14 and 16 and ~he central member 12 and subsequently friction forging the components together is enhanced with respect to the conventional manufacturing process inYolving upset forging of the ends of a sleeve section.
Improved alignment between the axis of the coupling sections can accrue from the use of the friction forging process.
The tubular coupling used for interconnecting the sleeve sections 10 comprises the female threaded section 14 and the male threaded section 16, as can be seen in Figure 2. The threads of these sections 14,1~ are provided on frusto-conical surfaces and ~O such an arrangement is sometimes referred to as "an extreme line thread~'. The female section 14 has a shoulder 18 at the base of the thread 20. The male threaded section 16 has an abutment 22 which engages wi~h th~ shoulder 18 when the male and female sections 14,16 are fully engaged~ Engagement ~20~ 7 of the shoulder 18 by the abutment 22 provides a fluid tight seal preventing the escape of fluid flowing within the sleeve by penetration through the coupling.
The shoulder 18 of the female threaded section 14 is under 5 cut and the abutment 22 of the male threaded section 16 is complementarily shaped to fit into the under cut shoulder 18. The engagement between the male abutment 22 and the female under cut shoulder 18 is shown on an enlarged scale in Figure 3. The inclined surface 24 of the under cut shoulder 18 mates 10 with a surface 26 of the abutment 22 which is inclined at the same angle as the surface 240 The inner upright 28 of the shoulder 18 mates with a surface 30 on the abutment 22.
The upright 28 of the shoulder 18 is offset from the surface 32 on which the thread 20 is pro~/ided in order that the surface 30 of the abutment 22 may readily pass over the thread 20 but still mate with the surface 28. Consequently, in addition to the seal provided by the engagement of the respective threads of the male and female sections two additional seals are provided.
One of the additional seals being the engagement of surface 20 24 with surface 26 and the other being the engagement between surfaces 28 and 30. If the tubular coupling is subjected to a lateral bending moment, during installation of the sleeve or due tc movement of the well wall, at least one of the additional seals is maintained on either sid~ of the coupling. If a lateral 25 bending moment is applied in the direction indicated by arrow C in Figure 2, a radial force will be generated which will tend to separate surfaces 28 and 30 on the side of the coupling illustrated in figures 2 and 3 while reinforcing the contact between surfaces 28 and 30 on the opposite (unillustrated) side of the coupling. This could result itl the seal being broken for part of the circumference of the coupling~ However, for that part of the circumference of the cowpling in which the surfaces 28 and 30 are urged apart the surfaces 24 and 26 must necessarily be urged into harder engagement. Therefore, a circwmferential seal is maintained between ~he abutment 22 and shoulder 18 when a lateral bending moment is applied to the coupling.
The angle of inclination of the inclin_d surface 24 of the under cut shoulder 18 with respect to the longitudinal axis of the sleeve section 10 is preferably of the order of 45, although the precise angle is not critical.
The male threaded section 16 is provided with a shoulder 34 at the base of the male thread 36. The female threaded section 14 is provided with an abutment 38 which abuts the shoulder 34. The shoulder 34 is undercut and the abutment 38 is complementarily shaped so that the abutment 38 and shoulder 34 engage in a similar fashion ~o the abutmen~ 22 and shoulder 18. However, the upright 40 of the shoulder 34 is not offset from the thread level as is the upright 28 of shoulder 18. In addition, a small clearance typically of the order of two thousandths of an inch may be left between the abutment 38 and shoulder S~3'7 34 so as to ensure that surfaces 24 and 26 of the shoulder 18 and abutment 22 respectively are not prevented from mating by the prior mating of abutment 38 and shoulder 34.
When a well is drilled, particularly for oil wells, the wall of the well is lined with a sleeve which is formed of ~ubular sect;ons which are screw-threaded together as the sleeve is inser~ed into ~he well. The tubular sections are conventionally manufactured from lengths of tubing the ends of which are upset forged and subsequently cold rolled in order to provide ; the threads for engaging one tubular section to the next.
The present invention seeks to provide an improved sleeve for lining a well wall and an improved ~ubular coupling for use in connecting together the tubular sections of the sleeve~
According to a first aspect of the present invention, there is provided a tubular coupling comprising a male threaded section and a female threaded section, the female threaded section having a shoulder at the base of the thread, the shoulder being engaged by an abutment on the male threaded section, when the sections are fully engaged, to thereby provide a seal, the shoulder being undercut and the abutment being complementar~ly shaped whereby, upon application of a lateral bending moment ~15~33~
to the coupling a radial force is produced between the shoulder and abutment in order to maintain the seal.
According to a second aspect of the present invention, there is provided a sleeve section for forming a sleeve for lining a well wall, co~prising a central tubular member having a respective coupling component friction forged to each end thereof.
Preferably, the threads of the male and female sections are provided on respective frusto-conical surfaces.
Advantageously~ ~he male threaded section is provid~d with a shoulder at the base of 'he thread and the female threaded section is provided with a complementarily shaped abutmen~
whereby, upon application of a lateral bending moment to the coupling a portion of the female threaded section abutment L5 may engage a portion of the male threaded section shoulder.
According to a further aspect of the present invention there is provided a method of manufacturing a sleeve section for forming a sleeve for lining a well wall comprising friction forging a respective coupling component with each end of a central tubular member.
Embodiments of the present invention will now be described by way of example only and with reference to the accompanying drawings, in which:
Figure 1 is a diagrammatic partial side view of the ends of two sleeve sec~ions coupled together, Figure 2 is a longitudinal sectional view of part of a tubular coupling used for connecting together sleeve sections as shown in Figure 1, Figure 3 illustrates area A of Figure 2 to an enlarged scale, and Figure 4 illustrates area B of Figure 2 to an enlarged scale.
A sleeve for lining a well wall is formed from a number of sleeve sections coupled together. The sleeve sections may be provided with either male or female couplings at both ends, în which case additional co1nponents are required for interconnecting the sections, or the sleeve sections may be provided with a female component at one end and a male component at the other end. As can be unders~ood from Figures 1 and 2, the sleeve sections 10 are formed of a central tubular member 12 having a respective coupling component secured to each end thereof. The central tubular member 12 has a female threaded ~ section 14 friction forged to one end of the cen~ral tubular member 12 and a male threaded portion 15 friction forged to the other end thereof.
~2~ r~
-- 4 ~
The male section 14 and the female section 16 may be sequentially friction forged to the central member 12 or, sJith the aid of suitable machinery, may be simultaneous~y friction forged to the central member 12. In either case, the central member 12 is held stationary and the male/female section retained in a chuck. The chuck is revolved at high speed and the male/female section and the central member 12 are brought into contact under the ac~ion of a relatively high pressure. The friction between the components is sufficient to cause the components to fuse together. A certain amount of flash may be produced at the junctions of the components and this is subsequently machined off. It has been found possible to produce friction forged adhesion between components wherein the adhesion is stronger than one of the parent materials.
The male and female sections are preformed and hence the sleeve section 10 may easily be constructed having different combinations of coupling sections. The provision of the threaded sections in the conventional manufacture of sleeve sections is burdensome because the entire sleeve section has to be manipulated and machine controlled during formation of the couplings~ Conventional manufacture becomes more onerous where specialised couplings or combinations are required and the necessary apparatus is considered to be relatively expensive and slow in operation compared ~ith the method of manufacture of the present invention.
The length of the sleeve section 10 is readily variable, since differing lengths of the central tubular member 12 are easily ~2~ 3 incorporated into the sleeve section 10.
Since the sleeve section 10 is constructed from separate components, the components need not consist of the same material, unlike conventional sleeve sections. The process of friction forging 5 enables materials such as aluminium and steel to be joined even though such joints are generally regarded as being unobtainable by known methods of welding. In the known art, if it is desired to provide couplings of a high quality material, then the entire sleeve section 10 must necessarily be formed of that material. The present invention permits a lower quality material to be used for the major, central, member 12 and a different material having the requisite qualities to be used for the coupling components 14 and 16. It is often acceptable to have a central member 12 of the sleeve section 10 fabricated from a different quality material than the coupling components 14 and 16. Th~s is due to the fact that the coupling components threadedly engage like components and are subjected to rotary torques during assembly of the sleeve sections to form a sleeve for lining a well wall~ The c~ntral member 12 is not subjected to any substantial rotary torque during assembly of the sleeve section into a sleeve. It has been found that the sleeve sections 10 of the present invention readily meet the industrial strength standards specified for such components. An additional benefit of forming the sleeve sections 10 of discrete components is that the central member 12 can be pretreated, for example OSt~37 by being provided with a coating. Such coatings may be applied for a specific purpose such as anti-corrosion. This feature can be of particular benefit when the central member 12 is fabricated of a lower quality material than the coupling sections 14 and 16.
Sleeve sections 10 of the present invention are economically desirable since they may permit the raw material cost to be reduced and permit the speed of manufacture to be improved.
The combined time for preforming the coupling sections 14 and 16 and ~he central member 12 and subsequently friction forging the components together is enhanced with respect to the conventional manufacturing process inYolving upset forging of the ends of a sleeve section.
Improved alignment between the axis of the coupling sections can accrue from the use of the friction forging process.
The tubular coupling used for interconnecting the sleeve sections 10 comprises the female threaded section 14 and the male threaded section 16, as can be seen in Figure 2. The threads of these sections 14,1~ are provided on frusto-conical surfaces and ~O such an arrangement is sometimes referred to as "an extreme line thread~'. The female section 14 has a shoulder 18 at the base of the thread 20. The male threaded section 16 has an abutment 22 which engages wi~h th~ shoulder 18 when the male and female sections 14,16 are fully engaged~ Engagement ~20~ 7 of the shoulder 18 by the abutment 22 provides a fluid tight seal preventing the escape of fluid flowing within the sleeve by penetration through the coupling.
The shoulder 18 of the female threaded section 14 is under 5 cut and the abutment 22 of the male threaded section 16 is complementarily shaped to fit into the under cut shoulder 18. The engagement between the male abutment 22 and the female under cut shoulder 18 is shown on an enlarged scale in Figure 3. The inclined surface 24 of the under cut shoulder 18 mates 10 with a surface 26 of the abutment 22 which is inclined at the same angle as the surface 240 The inner upright 28 of the shoulder 18 mates with a surface 30 on the abutment 22.
The upright 28 of the shoulder 18 is offset from the surface 32 on which the thread 20 is pro~/ided in order that the surface 30 of the abutment 22 may readily pass over the thread 20 but still mate with the surface 28. Consequently, in addition to the seal provided by the engagement of the respective threads of the male and female sections two additional seals are provided.
One of the additional seals being the engagement of surface 20 24 with surface 26 and the other being the engagement between surfaces 28 and 30. If the tubular coupling is subjected to a lateral bending moment, during installation of the sleeve or due tc movement of the well wall, at least one of the additional seals is maintained on either sid~ of the coupling. If a lateral 25 bending moment is applied in the direction indicated by arrow C in Figure 2, a radial force will be generated which will tend to separate surfaces 28 and 30 on the side of the coupling illustrated in figures 2 and 3 while reinforcing the contact between surfaces 28 and 30 on the opposite (unillustrated) side of the coupling. This could result itl the seal being broken for part of the circumference of the coupling~ However, for that part of the circumference of the cowpling in which the surfaces 28 and 30 are urged apart the surfaces 24 and 26 must necessarily be urged into harder engagement. Therefore, a circwmferential seal is maintained between ~he abutment 22 and shoulder 18 when a lateral bending moment is applied to the coupling.
The angle of inclination of the inclin_d surface 24 of the under cut shoulder 18 with respect to the longitudinal axis of the sleeve section 10 is preferably of the order of 45, although the precise angle is not critical.
The male threaded section 16 is provided with a shoulder 34 at the base of the male thread 36. The female threaded section 14 is provided with an abutment 38 which abuts the shoulder 34. The shoulder 34 is undercut and the abutment 38 is complementarily shaped so that the abutment 38 and shoulder 34 engage in a similar fashion ~o the abutmen~ 22 and shoulder 18. However, the upright 40 of the shoulder 34 is not offset from the thread level as is the upright 28 of shoulder 18. In addition, a small clearance typically of the order of two thousandths of an inch may be left between the abutment 38 and shoulder S~3'7 34 so as to ensure that surfaces 24 and 26 of the shoulder 18 and abutment 22 respectively are not prevented from mating by the prior mating of abutment 38 and shoulder 34.
Claims (14)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A sleeve section for forming a sleeve for lin-ing a well wall comprising a central tubular member and two coupling components, the coupling components being friction forged to respective ends of the central tubular member.
2. A sleeve section as claimed in claim 1, where-in the central tubular member and at least one coupling com-ponent are formed of different materials.
3. A sleeve section as claimed in claim 1, where-in the central tubular member is provided with a coating.
4. A sleeve section as claimed in claim 1, where-in the coupling components are capable of forming respective tubular couplings with complementary threaded sections of additional sleeve sections, each tubular coupling comprising a male threaded section and a female threaded section, the female threaded section having a shoulder at the base of its thread and the male threaded section having an abutment, the shoulder and abutment being engaged when the sections are fully engaged and a seal provided by engagement between the section and abutment, the shoulder being undercut and the abutment being complementarily shaped whereby, upon application of a lateral bending moment to the coupling a radial force is produced betwen the shoulder and aubtment in order to maintain the seal.
5. A sleeve section as claimed in claim 4, where-in the threads of the male and female sections are provided on respective frusto-conical surfaces.
6. A sleeve section as claimed in claim 4, where-in the angle of the undercut of the shoulder is substantially 45° with respect to the axis of the coupling.
7. A sleeve section as claimed in claim 4, where-in the male threaded section has a shoulder at the base of its thread and the female threaded section has an abutment, the abutment of the female threaded section being adjacent the shoulder of the male threaded section when the sections are fully engaged, the shoulder of the male threaded section being undercut and the abutment of the female threaded mem-ber being complementarily shaped whereby, upon application of a lateral bending moment to the coupling a portion of the abutment on the female threaded section may contact a corres-ponding portion on the shoulder of the male threaded section.
8. A sleeve section as claimed in claim 7, where-in the angle of the undercut of the shoulder on the male threaded section is substantially 45° with respect to the longitudinal axis of the coupling.
9. A sleeve for lining a well wall comprising a plurality of sleeve sections, the sleeve sections being as claimed in claim 1, 2 or 3.
10. A method of manufacturing a sleeve section for forming a sleeve for lining a well wall comprising friction forging a respective coupling component with each end of a central tubular member.
11. A method as claimed in claim 10, wherein the coupling components are simultaneously friction forged with the central tubular member.
12. A method as claimed in claim 10, wherein the central tubular member is held stationary during friction forging.
13. A method as claimed in claim 10, comprising the step of performing at least one of the coupling com-ponents by drop forging.
14. A method as claimed in claim 13, comprising the step of cold rolling a thread on the coupling components subsequent to drop forging and prior to friction forging.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08125759A GB2104990B (en) | 1981-08-24 | 1981-08-24 | A sleeve for lining a well wall and a tubular coupling therefore |
| GB8125759 | 1981-08-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1205837A true CA1205837A (en) | 1986-06-10 |
Family
ID=10524135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000409924A Expired CA1205837A (en) | 1981-08-24 | 1982-08-23 | Sleeve for lining a well wall and a tubular coupling therefor |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS5841182A (en) |
| KR (1) | KR840001673A (en) |
| AU (1) | AU8753982A (en) |
| BR (1) | BR8204950A (en) |
| CA (1) | CA1205837A (en) |
| ES (1) | ES515225A0 (en) |
| GB (1) | GB2104990B (en) |
| IN (1) | IN157701B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3117066A4 (en) * | 2014-06-16 | 2018-01-10 | Halliburton Energy Services, Inc. | Casing joint assembly |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4429904A (en) * | 1981-07-06 | 1984-02-07 | Dril-Quip, Inc. | Self-aligning connector |
| SE8203247L (en) * | 1982-05-25 | 1983-11-26 | Jagelid Kjell Inge Gunnar | COMPARATIVE CIRCUIT AT THE ROD FOR BORING ENDAMAL |
| GB8414203D0 (en) * | 1984-06-04 | 1984-07-11 | Hunting Oilfield Services Ltd | Pipe connectors |
| IT1199343B (en) * | 1986-12-23 | 1988-12-30 | Dalmine Spa | PERFECTED JOINT FOR WELL COATING PIPES |
| JPH0415685U (en) * | 1990-05-24 | 1992-02-07 | ||
| FR2726067B3 (en) * | 1994-10-19 | 1996-09-13 | Tubafor | DEVICE FOR ASSEMBLING TUBES AND TUBES PROVIDED WITH SAID ASSEMBLY DEVICE |
| DE20213974U1 (en) * | 2002-09-06 | 2002-11-07 | Henze Gmbh Kunststoffwerk | Plastic pipe |
| JP6137115B2 (en) * | 2014-10-27 | 2017-05-31 | Ｊｆｅスチール株式会社 | Steel pipe joints |
-
1981
- 1981-08-24 GB GB08125759A patent/GB2104990B/en not_active Expired
-
1982
- 1982-08-23 CA CA000409924A patent/CA1205837A/en not_active Expired
- 1982-08-24 AU AU87539/82A patent/AU8753982A/en not_active Abandoned
- 1982-08-24 JP JP57146754A patent/JPS5841182A/en active Pending
- 1982-08-24 BR BR8204950A patent/BR8204950A/en unknown
- 1982-08-24 ES ES515225A patent/ES515225A0/en active Granted
- 1982-08-25 IN IN987/CAL/82A patent/IN157701B/en unknown
- 1982-09-09 KR KR1019820004074A patent/KR840001673A/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3117066A4 (en) * | 2014-06-16 | 2018-01-10 | Halliburton Energy Services, Inc. | Casing joint assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| AU8753982A (en) | 1983-02-24 |
| ES8308387A1 (en) | 1983-08-16 |
| BR8204950A (en) | 1983-08-02 |
| GB2104990B (en) | 1985-04-24 |
| GB2104990A (en) | 1983-03-16 |
| KR840001673A (en) | 1984-05-16 |
| IN157701B (en) | 1986-05-24 |
| ES515225A0 (en) | 1983-08-16 |
| JPS5841182A (en) | 1983-03-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |