CN105422018B - The effective high leakproofness nipple of Solid expandable under big expansion rate - Google Patents
The effective high leakproofness nipple of Solid expandable under big expansion rate Download PDFInfo
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- CN105422018B CN105422018B CN201510906690.1A CN201510906690A CN105422018B CN 105422018 B CN105422018 B CN 105422018B CN 201510906690 A CN201510906690 A CN 201510906690A CN 105422018 B CN105422018 B CN 105422018B
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- 210000002445 nipple Anatomy 0.000 title claims abstract description 37
- 239000007787 solid Substances 0.000 title claims abstract description 27
- 238000007789 sealing Methods 0.000 claims abstract description 46
- 239000002184 metal Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000000565 sealant Substances 0.000 claims description 8
- 238000003466 welding Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 17
- 238000000034 method Methods 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 8
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000002474 experimental method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 5
- 210000002421 cell wall Anatomy 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 210000001503 joint Anatomy 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 239000008186 active pharmaceutical agent Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction 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
- 238000009434 installation Methods 0.000 description 1
- 230000036244 malformation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004021 metal welding Methods 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 230000007704 transition Effects 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
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
- Gasket Seals (AREA)
Abstract
The effective high leakproofness nipple of Solid expandable under big expansion rate of the invention, using direct linkage type helicitic texture, nipple includes expansion tube box, expansion tube pin thread；Expansion tube box is inwardly disposed with low taper single hook type box thread, escape, cylinder seal section, primary seal groove and/or secondary seal groove, conical surface seal section and negative angle torque shoulder by end；Expansion tube pin thread is inwardly disposed with negative angle torque shoulder, conical surface seal section, cylinder seal section, single hook type male thread by end；Nipple uses binary channels Multi-level sealing structure, the binary channels seal form of three-level sealing structure and secondary seal structure after expansion before specifically expanding；The present invention reduces deformed threads degree under big expansion rate using single hook type form of thread and the design of low taper thread, high sealing performance after the big expansion rate deformation of nipple, while detection easy to process are met by the binary channels Multi-level sealing structure that optimizes after largely calculating experiment.
Description
Technical field
The scope that the present invention relates to is that industrial gas oil is drilled well flow string connection screw thread structure design, more particularly to
A kind of big expansion rate solid expansion pipe used in the subsidy of set damage, formation shut-off and barefoot completion is used with high sealing ability
Nipple design method, to ensure that Oil/gas Well is safely and effectively exploited.
Background technology
With further going deep into for natural petroleum gas field, the more and more deeper development difficulty of drilling depth is increasing, simultaneously
The many old fileds in China enter the later stage of exploitation, damage problem getting worse are covered, in order to solve institute during actual exploration and development
The difficulty run into, the speed of drilling is improved, save drilling cost, Solid expandable Manifold technology, which has been incorporated into, to be drilled during well simultaneously
With very excellent performance.
The general principle of Solid expandable Manifold technology is exactly the position that will be subscribed under a kind of good steel pipe of plasticity to underground, is led to
Supercooling working plasticity mode of texturing makes the internal diameter of steel pipe be expanded to required size, and cold deformation is by expansion cone (expansion cone
External diameter is more than the internal diameter of steel pipe) make tubing that permanent modeling occur through expansion tube in the presence of hydraulic coupling and/or mechanical force
Property deformation reach expand caliber purpose.It is to form tubing string with the connection of screw thread twist-on between solid expansion pipe, therefore screw thread is swollen
Weakest link in tube expansion tubing string, its structural intergrity, sealing integrity and reliability, have a strong impact on the safety in production in oil field
With the tubing string life-span.Because Solid expandable pipe screw thread needs, by once expanding deformation, to need to reach one after deformation in use
Fixed sealing and load-carrying properties, the requirement to the sealing and integrality of screw thread is higher, and common API screw threads and in general sleeve pipe are special
Different helicitic texture at all can not meet demand.Occur some expansion tube helicitic textures in recent years, but be primarily directed to low
Expansion rate (less than 15%), seal pressure is not also high, leads to not in highly expanded deformation rate or requires high to swollen rear sealing property
Operating mode under use, greatly constrain the development and application of bulged tube technology.Now with the progress of bulged tube technology, especially
It is the demand of formation shut-off and ocean bulged tube technology, the sealing and structural integrity after expansion rate and expansion to expansion tube
Property propose requirements at the higher level, be badly in need of a kind of expansion tube Special threading connector design method for meeting high sealing performance under big expansion rate.
The content of the invention
A kind of nipple of the big effective high sealing ability of expansion rate Solid expandable of the present invention is primarily to meet big swollen
High leakproofness demand during swollen rate solid expansion pipe application, big expansion is reduced using single hook type form of thread and the design of low taper thread
Deformed threads degree under rate, meet the big expansion of nipple by largely calculating the binary channels Multi-level sealing structure optimized after experiment
The high sealing performance of (expansion rate 10%-35%) after rate deformation, while detection easy to process.
The present invention technical solution be：The effective high leakproofness nipple of Solid expandable under big expansion rate, using straight
Even type helicitic texture, it is characterized in that：
The nipple includes expansion tube box 1, expansion tube pin thread 2；
Expansion tube box 1 is inwardly disposed with low taper single hook type box thread 3, escape 5, cylinder seal section by end
6th, primary seal groove 7 and/or secondary seal groove 8, conical surface seal section 9 and negative angle torque shoulder 10；Expansion tube pin thread 2 is by holding
Portion is inwardly disposed with negative angle torque shoulder 10, conical surface seal section 9, cylinder seal section 6, single hook type male thread 4；
The nipple uses binary channels Multi-level sealing structure, three-level sealing structure and after expansion two before specifically expanding
The binary channels seal form of level sealing structure；
Three-level sealing structure includes before the expansion：
The cylinder seal section 6 of the expansion tube box 1 forms post before inflation with the cylinder seal section 6 of expansion tube pin thread 2
In face of cylinder primary seal structure；
The conical surface seal section 9 of the expansion tube box 1 forms cone before inflation with the conical surface seal section 9 of expansion tube pin thread 2
In face of conical surface secondary seal structure；
The negative angle torque shoulder 10 of the expansion tube box 1 matches with the negative angle torque shoulder 10 of expansion tube pin thread 2
Close three-level auxiliary sealing structure before composition expands；
Secondary seal structure includes after the expansion：
The primary seal groove 7 of the expansion tube box 1 and the elastic sealant being arranged in primary seal groove 7 are easy
Welding metal and the cylinder seal section 6 of expansion tube pin thread 2 form primary seal slot structure；
The secondary seal groove 8 of the expansion tube box 1 and the uprising O-ring seal that is arranged in secondary seal groove 8 with
The conical surface seal section 9 of expansion tube pin thread 2 forms secondary seal slot structure；
The primary seal groove 7 and secondary seal groove 8 are inwardly set gradually by end.
Above-mentioned expansion tube box 1 also includes inwardly being set gradually by end and positioned at the low outside of taper single hook type box thread 3
End shoulders 12, end cylinder 11；
Expansion tube pin thread 2 also includes inwardly being set gradually by end and positioned at the end cylinder of the inner side of single hook type male thread 4
11st, end shoulders 12；
The end shoulders 12 of the expansion tube box 1, end cylinder 11 respectively the end shoulders 12 with expansion tube pin thread 2,
End cylinder 11 matches.
On above-mentioned cylinder seal section 6 increase auxiliary seal cambered surface 7A, the primary seal groove 7 of the expansion tube box 1 and
The elastic sealant being arranged in primary seal groove 7 or easy welding metal and the auxiliary seal cambered surface 7A structures of expansion tube pin thread 2
Into primary seal slot structure.
The taper of above-mentioned single hook type box thread 3 and single hook type male thread 4 is 1:18~1:30.
The taper of above-mentioned single hook type box thread 3 and single hook type male thread 4 is 1:20.
The above-mentioned conical surface is to the conical surface seal section 9 of expansion tube box 1 in conical surface seal section and the conical surface seal of expansion tube pin thread 2
Section 9 uses identical or different taper.
The above-mentioned conical surface is 1 to the taper of the conical surface seal section 9 of expansion tube box 1 in conical surface seal section:12；
The conical degree of conical surface of the conical surface seal section 9 of the expansion tube pin thread 2 is 1:16.
Above-mentioned single hook type male thread 4 includes external screw thread, externally threaded crest 13 and externally threaded tooth bottom 15 with screw thread
Bus is parallel, and externally threaded loading end uses negative angle structure, and the normal angle of loading end and column axis is -3.5~-10 °,
The normal angle of externally threaded spigot surface 14 and column axis is 10~45 °；The single hook type box thread and single hook type male thread
Match.
The negative angle of above-mentioned negative angle torque shoulder is 15 °；The cylinder is 0.07mm to the magnitude of interference of cylinder seal section；Institute
The normal angle for stating externally threaded loading end and column axis is -9 °, the method wire clamp of externally threaded spigot surface 14 and column axis
Angle is 35 °.
Advantage of the present invention：By rational low taper single hook type Design of Screw Thread, it ensure that screw thread has enough thickness to protect
Hold intensity while substantially improve degreeof tortuosity of the screw thread in the deformation of big expansion rate, improve the bearing capacity and sealing of screw thread,
Binary channels Multi-level sealing structure is used in sealing surface design, three-level sealing structure and two level after expansion are close before being expanded by design
Seal structure binary channels seal form, meet nipple after excessive expansion rate deforms (expansion rate 10%-35%) to high sealing
Property and high bearing capacity requirement, and sealing structure and sealability when expansion pipe column receives stretching and compressive load not by
Influence, greatly improve the expansion rate and sealing property of nipple.
Pin thread end cone face and box end cone face can use different tapers to control in the conical surface is to conical surface seal section simultaneously
Interference point position and maximum seal contact pressure, improve the anti-galling performance of screw thread, prevent that thread seal loses caused by damage
Effect.Can according in working condition requirement upon inflation secondary seal structure can be selected any seal groove or all second-order structure,
Flexible structure, it is easy to improve processing detection efficiency and reduces cost.
Brief description of the drawings
Fig. 1, Fig. 1 (b) are the screw-thread joint structure schematic diagrames of the effective high sealing ability of big expansion rate Solid expandable；
Fig. 2 is nipple dilatancy pre-structure schematic diagram of the present invention；
Fig. 3 is the nipple seal groove structure schematic diagram after dilatancy of the present invention；
Fig. 4 is high sealing pressure schematic diagram caused by uprising O-ring seal in secondary seal slot structure 8 of the present invention；
Fig. 5 is nipple pin thread auxiliary seal globoidal structure schematic diagram of the present invention；
Fig. 6 is form of thread structural representation；
Fig. 7 is the structural representation after being detained on nipple of the present invention；
Fig. 8 is contact schematic diagram of the O-shaped rubber ring along cell wall under the expansion rate of embodiment one 28%；
Fig. 9 is contact schematic diagram of the O-shaped rubber ring along cell wall under the expansion rate of embodiment 2 20%；
Embodiment
The Special threading connector structure design schematic diagram of the present invention is shown in Fig. 1, and nipple uses direct linkage type helicitic texture, its
In 1 be expansion tube box, 2 be expansion tube pin thread, processes low taper single hook type mother's spiral shell respectively on expansion tube box 1 and pin thread 2
Line 3 and male thread 4, what is be connected with the left side of single hook type box thread 3 is end cylinder 11 and end shoulders 12, for controlling upper button bit
Put；What is be connected with the right of single hook type box thread 3 is escape 5, chaser withdrawing during for processing screw thread, while on screw thread
The unnecessary thread compound of storage is played after button, reduces the negative effect of thread compound pressure butt joint sealing property；It is with what escape 5 was connected
A pair of cylinders are to cylinder seal section 6, in cylinder to being designed with primary seal slot structure 7 on cylinder seal section 6, in cylinder to cylinder
What the right of seal section 6 was attached thereto is secondary seal slot structure 8, on the right of secondary seal slot structure 8 is a pair of conical surfaces to the conical surface
Seal section 9, what is conical surface seal section 9 is connected by a transition chamfering with the conical surface is negative angle torque shoulder 10, for controlling
Position on the buckle has auxiliary seal effect simultaneously.
In the present invention, cylinder forms to cylinder seal section 6, the conical surface to conical surface seal section 9 and negative angle torque shoulder 10
Three-level sealing structure before expansion, upper button rear pillar have higher sealing in face of cylinder seal section 6 and the conical surface to conical surface seal section 9
Property, when nipple is stretched load and higher internal pressure, sealing property is unaffected, when can meet to expand pipe construction
Tubing string is transferred and initial pressure is established, and because the design of the rational magnitude of interference can prevent thread gluing, negative angle moment of torsion platform
Shoulder 10 can not only control torque wrench moment, while have auxiliary three-level sealing function, and rational negative angle design turns round negative angle
Square shoulder 10 can still keep auxiliary seal effect under the effect of certain tensile load.
The conical surface of the present invention pin thread end cone face in conical surface seal section 9 and box end cone face can be used different tapers with
Interference point position and maximum seal contact pressure are controlled, improves the anti-galling performance of screw thread, prevents that screw thread is close caused by damage
Envelope failure.
In view of being expanded under big expansion rate, rear thread malformation is larger, and cylinder is to cylinder seal section 6, the conical surface to the conical surface
Seal section 9 and negative angle torque shoulder 10 occur moderate finite deformation and seal failure occur upon inflation, as shown in Fig. 2 of the invention
It has been specifically designed secondary seal structure after expanding：Primary seal slot structure 7 and secondary seal slot structure 8, can by specially designing
To ensure that after the deformation of big expansion rate still with holding structure big change, such as Fig. 3 completely can not occur for this 2 kinds of seal groove structures
It is shown.Before expansion, elastic sealant or easy welding metal such as tin etc. are filled inside, and installation is anti-in secondary seal slot structure 8
Sudden and violent O-ring seal, it is viscous in the elastic sealant during upper button in primary seal slot structure 7 and the reaction of pin thread cylinder seal section 6
Connect, or pin thread coats easy welding metal such as tin etc. with the corresponding site of primary seal slot structure 7 also surface, it is public during upper button
The metal buckled produces metal welding with the metal friction heat in primary seal slot structure 7, when screw thread becomes through excessive expansion rate
After shape, due to 2 kinds of seal grooves still structural integrity, elastic sealant sealing or metal in primary seal slot structure 7 be present
Welding, there be high sealing pressure (as shown in Figure 4) caused by uprising O-ring seal in secondary seal slot structure 8, therefore pass through
After big dilatancy, the helicitic texture still possesses high sealing ability under the secondary seal effect of 2 seal grooves.
Heretofore described pin thread can be processed as auxiliary seal cambered surface 7A, such as Fig. 5 with the opposite site of primary seal slot structure 7
It is shown, it can further improve sealing effectiveness.
The heretofore described end cylinder 11 and end shoulders 12 of can removing does not influence structure of the present invention and sealing effectiveness.
Heretofore described primary seal slot structure 7 and secondary seal slot structure 8 can according to use demand all processing or
Person chooses one of them and is processed.
It is of the present invention on Design of Screw Thread, using low tapered configuration, low taper single hook type box thread 3 and male thread 4
Taper is much smaller than the taper of API screw threads, taper 1:18~1:30, this design can significantly reduce thread taper and bring
Wall thickness reduction, improve the bearing capacity of helicitic texture, designed on tooth form using single hook type form of thread, as shown in fig. 6, outside
The crest 13 of screw thread and externally threaded tooth bottom 15, parallel with the bus of screw thread, externally threaded loading end uses negative angle structure
The normal angle of design, loading end and column axis is -3.5~-10 °, the normal of externally threaded spigot surface 14 and column axis
Angle is 10~45 °, and this structure can substantially improve degreeof tortuosity of the screw thread in the deformation of big expansion rate, improve holding for screw thread
Loading capability and sealing.
Structural representation after being detained on the design nipple is shown in Fig. 7.
Helicitic texture forms and size requirement is referring to table 1；
Table 1
Specific implementation can carry out screw thread preparation according to the requirement of specific operating mode from the solid expansion pipe of different size.Adopt
Processed with Digit Control Machine Tool, during processing, process end shoulders 12 first by rough turn blade and arrange thread taper, then using essence
It is close to the conical surface to cylinder seal section 6, primary seal slot structure 7, secondary seal slot structure 8 and the conical surface that turning insert processes cylinder successively
Section 9 is sealed, reprocessing negative angle torque shoulder 10, finally processes screw thread using screw forming chasing tool, last hair down is pierced and examines spiral shell
Line parameter.
Helicitic texture is diametrically expanded 10%~35% using configuration tool after being detained on screw thread, existed using hydraulic press
Suppressed inside expansion tube and detect whether threaded portion leaks, using cupping machine to nipple of the present invention
Solid expansion pipe carry out homogeneous tube tension test, detect screw thread bearing capacity.
Embodiment one：Inflatable 28% 140mm × 8mm Solid expandable pipe screw joints
Nipple of the present invention is processed using 140mm × 8mm solid expansion pipes body, design parameter is shown in Table 2, primary seal
The sealing of filling elastic sealant, the built-in explosion-proof O-shaped rubber ring of secondary seal slot structure 8 in slot structure 7.
Box phosphatization 10um is thick after processing.Thread compound is uniformly smeared at both ends during upper button, and factory end uses detains in peak torque,
Live end uses detains in best torque.The screw thread process parameter of embodiment one is referring to table 2：
Table 2
The expansion operation of 28% expansion rate is carried out to the nipple of first-class button, prevented after expansion in secondary seal slot structure 8
Quick-fried O-shaped rubber ring is shown in Fig. 8 along the contact of cell wall.
The water pressure test is carried out to the screw thread after expansion, suppressing 30 minutes no pressures of 40MPa pressurizes reduces, while tension test
Loading 1700kN axial loads do not reveal generation, and helicitic texture meets structural intergrity, high leakproofness requirement.
Embodiment two：Inflatable 20% 245mm × 12mm Solid expandable pipe screw joints
Nipple of the present invention is processed using 245mm × 12mm solid expansion pipes body, design parameter is shown in Table 2, and one-level is close
In sealing groove structure 7 and pin thread coats zinc alloy layer with the opposite site of primary seal slot structure 7, and secondary seal slot structure 8 is built-in anti-
Quick-fried O-shaped rubber ring.
Box phosphatization 10um is thick after processing.Thread compound is uniformly smeared at both ends during upper button, and factory end uses detains in peak torque,
Live end uses detains in best torque.The screw thread process parameter of embodiment two is referring to table 3：
Table 3
The expansion operation of 20% expansion rate is carried out to the nipple of first-class button, prevented after expansion in secondary seal slot structure 8
Quick-fried O-shaped rubber ring is shown in Fig. 9 along the contact of cell wall.
The water pressure test is carried out to the screw thread after expansion, suppressing 30 minutes no pressures of 35MPa pressurizes reduces, while tension test
Loading 3234kN axial loads do not reveal generation, and helicitic texture meets structural intergrity, high leakproofness requirement.
Claims (9)
1. the effective high leakproofness nipple of Solid expandable under big expansion rate, using direct linkage type helicitic texture, it is characterised in that：
The nipple includes expansion tube box (1), expansion tube pin thread (2)；
Expansion tube box (1) is inwardly disposed with low taper single hook type box thread (3), escape (5), cylinder sealing by end
Section (6), primary seal groove (7) and secondary seal groove (8), conical surface seal section (9) and negative angle torque shoulder (10)；Expansion tube
Pin thread (2) is inwardly disposed with negative angle torque shoulder (10), conical surface seal section (9), cylinder seal section (6), list by end
Hook male thread (4)；
The nipple uses binary channels Multi-level sealing structure, and three-level sealing structure and two level after expansion are close before specifically expanding
The binary channels seal form of seal structure；
Three-level sealing structure includes before the expansion：
The cylinder seal section (6) of the expansion tube box (1) and the cylinder seal section (6) of expansion tube pin thread (2) structure before inflation
Into cylinder to cylinder primary seal structure；
The conical surface seal section (9) of the expansion tube box (1) and the conical surface seal section (9) of expansion tube pin thread (2) structure before inflation
Into the conical surface to conical surface secondary seal structure；
The negative angle torque shoulder (10) of the expansion tube box (1) and the negative angle torque shoulder (10) of expansion tube pin thread (2)
It is engaged three-level auxiliary sealing structure before composition expands；
Secondary seal structure includes after the expansion：
The primary seal groove (7) of the expansion tube box (1) and the elastic sealant being arranged in primary seal groove (7) or
Easy welding metal and the cylinder seal section (6) of expansion tube pin thread (2) form primary seal slot structure；
The secondary seal groove (8) of the expansion tube box (1) and the uprising O-ring seal being arranged in secondary seal groove (8)
Secondary seal slot structure is formed with the conical surface seal section (9) of expansion tube pin thread (2)；
The primary seal groove (7) and secondary seal groove (8) are inwardly set gradually by end.
2. the effective high leakproofness nipple of Solid expandable under big expansion rate according to claim 1, it is characterised in that：
The expansion tube box (1) also includes inwardly being set gradually by end and on the outside of low taper single hook type box thread (3)
End shoulders (12), end cylinder (11)；
Expansion tube pin thread (2) also includes inwardly being set gradually by end and the end cylinder on the inside of single hook type male thread (4)
(11), end shoulders (12)；
The end shoulders (12) of the expansion tube box (1), end cylinder (11) end shoulders with expansion tube pin thread (2) respectively
(12), end cylinder (11) matches.
3. the effective high leakproofness nipple of Solid expandable, its feature exist under big expansion rate according to claim 1 or 2
In：Increase auxiliary seal cambered surface (7A) on the cylinder seal section (6), the primary seal groove (7) of the expansion tube box (1) with
And it is arranged on elastic sealant or easy welding metal and the auxiliary seal arc of expansion tube pin thread (2) in primary seal groove (7)
Face (7A) forms primary seal slot structure.
4. the effective high leakproofness nipple of Solid expandable under big expansion rate according to claim 3, it is characterised in that：Institute
The taper for stating single hook type box thread (3) and single hook type male thread (4) is 1:18~1:30.
5. the effective high leakproofness nipple of Solid expandable under big expansion rate according to claim 4, it is characterised in that：Institute
The taper for stating single hook type box thread (3) and single hook type male thread (4) is 1:20.
6. the effective high leakproofness nipple of Solid expandable under big expansion rate according to claim 5, it is characterised in that：Cone
The conical surface seal section (9) of expansion tube box (1) is adopted with the conical surface seal section (9) of expansion tube pin thread (2) in conical surface seal section
With identical or different taper.
7. the effective high leakproofness nipple of Solid expandable under big expansion rate according to claim 6, it is characterised in that：Cone
The taper of the conical surface seal section (9) of expansion tube box (1) is 1 in conical surface seal section:12；
The conical degree of conical surface of the conical surface seal section (9) of the expansion tube pin thread (2) is 1:16.
8. the effective high leakproofness nipple of Solid expandable under big expansion rate according to claim 7, it is characterised in that：Institute
Stating single hook type male thread (4) includes external screw thread, the bus of externally threaded crest (13) and externally threaded tooth bottom (15) with screw thread
Parallel, externally threaded loading end uses negative angle structure, and the normal angle of loading end and column axis is -3.5~-10 °, outer spiral shell
The spigot surface (14) of line is 10~45 ° with the normal angle of column axis；The single hook type box thread and single hook type male thread phase
Matching.
9. the effective high leakproofness nipple of Solid expandable under big expansion rate according to claim 8, it is characterised in that：Institute
The negative angle for stating negative angle torque shoulder is 15 °；Cylinder is 0.07mm to the magnitude of interference of cylinder seal section；The externally threaded carrying
The normal angle of face and column axis is -9 °, and the normal angle of externally threaded spigot surface (14) and column axis is 35 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510906690.1A CN105422018B (en) | 2015-12-09 | 2015-12-09 | The effective high leakproofness nipple of Solid expandable under big expansion rate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510906690.1A CN105422018B (en) | 2015-12-09 | 2015-12-09 | The effective high leakproofness nipple of Solid expandable under big expansion rate |
Publications (2)
| Publication Number | Publication Date |
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| CN105422018A CN105422018A (en) | 2016-03-23 |
| CN105422018B true CN105422018B (en) | 2017-12-15 |
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| CN201510906690.1A Expired - Fee Related CN105422018B (en) | 2015-12-09 | 2015-12-09 | The effective high leakproofness nipple of Solid expandable under big expansion rate |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112443279A (en) * | 2019-08-27 | 2021-03-05 | 中国石油化工股份有限公司 | Expansion corrugated pipe joint |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6409175B1 (en) * | 1999-07-13 | 2002-06-25 | Grant Prideco, Inc. | Expandable joint connector |
| CN101418673B (en) * | 2008-12-11 | 2012-10-17 | 中国石油天然气集团公司 | Single-hook screw thread and end plane metal self-sealing expansion sleeve pipe |
| CN202380987U (en) * | 2011-12-30 | 2012-08-15 | 中国石油天然气集团公司 | Internal-external thread connector of thin-wall expansion pipe |
| CN202810684U (en) * | 2012-07-25 | 2013-03-20 | 中国石油化工股份有限公司 | Joint connection structure of expansion pipes for oil wells |
| CN203081336U (en) * | 2012-12-28 | 2013-07-24 | 中国石油化工股份有限公司 | Non-coupling expansion outer threaded connector and non-coupling expansion inner threaded connector for expansion casing pipe |
| CN103527110A (en) * | 2013-09-18 | 2014-01-22 | 西安三环科技开发总公司 | Multistage sealing anti-sticky buckle type thread for titanium alloy oil casing |
| CN205259964U (en) * | 2015-12-09 | 2016-05-25 | 中国石油集团石油管工程技术研究院 | Big effective high leakproofness screwed joint of expansion rate lower excess volume expansion |
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2015
- 2015-12-09 CN CN201510906690.1A patent/CN105422018B/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN105422018A (en) | 2016-03-23 |
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Granted publication date: 20171215 Termination date: 20211209 |