CN105443865A - Deepwater pipe-in-pipe buckle arrestor based on T-shaped section deformation elements - Google Patents
Deepwater pipe-in-pipe buckle arrestor based on T-shaped section deformation elements Download PDFInfo
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- CN105443865A CN105443865A CN201410608221.7A CN201410608221A CN105443865A CN 105443865 A CN105443865 A CN 105443865A CN 201410608221 A CN201410608221 A CN 201410608221A CN 105443865 A CN105443865 A CN 105443865A
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Abstract
The invention belongs to the technical field of submarine pipeline laying and relates to a deepwater pipe-in-pipe buckle arrestor based on T-shaped section deformation elements. The deepwater pipe-in-pipe buckle arrestor based on the T-shaped section deformation elements is characterized in that the T-shaped section deformation elements are additionally arranged between an outer pipe and an inner pipe of a pipe-in-pipe structure. The T-shaped section deformation elements are buckled so as to prevent increase of relative movement of the inner and outer pipes during buckling deformation of a pipeline and can achieve the function of resisting internal pressure. According to the pipe-in-pipe buckle arrestor composed of the T-shaped section deformation elements and a plastic shell, the pipe-in-pipe size does not need to change, and the buckle arrestor is directly mounted between the inner pipe and the outer pipe without affecting a thermal insulation device in the pipe-in-pipe structure. The buckle arrestor is universal and can be cut according to pipe-in-pipe structures with different sizes and directly mounted on the outer pipe by a pipe-in-pipe manufacturer, and the heat retaining property of the buckle arrestor can be improved by means of the plastic shell made of a thermal insulation material. By means of the deepwater pipe-in-pipe buckle arrestor based on the T-shaped section deformation elements, buckling and buckling propagation of the deepwater pipe-in-pipe structure during storage, installation and operation can be prevented, the installation efficiency and buckle arresting efficiency of the deepwater pipe-in-pipe structure are improved, and the cost is reduced.
Description
Technical field
The invention belongs to undersea pipe-laying technical field, relate to a kind of deep water pipe-in-pipe buckle arrestor based on T-shaped section deformation element.
Background technique
Along with the day by day increase of countries in the world to petroleum resources demand, submarine pipeline develop into irresistible trend, there is many urgent problems in simultaneously Submarine Pipeline Design construction running.Wherein comparatively distinct issues are pipeline buckling problems, and the main cause producing flexing has: the acting in conjunction of elbow and external hydrostatic water pressure power, and other object collisions produce local dent, the overbending of installing and producing in using process.Because buckle propagation pressure is less than cripling pressure, once there is cripling unstability in pipeline, flexing will be propagated with the speed of hundreds of metre per second (m/s) along its length, namely buckle propagation is produced, thus make whole pipeline configuration generation failure damage, cause tremendous economic to lose and environmental destruction, and this buckle propagation is just difficult to be prevented from once generation.
The critical pressure of buckle propagation: the pressure minimum needed for pipeline buckle propagation can be maintained.The critical pressure of buckling failure (conquassation): be under pressure when namely pipeline can't harm completely the pressure minimum occurred needed for buckling failure.Research finds, buckle propagation pressure only has about the 1/8--1/4 of buckling failure pressure, in other words, the pressure more much smaller than buckling failure pressure has reached buckle propagation pressure, defect of pipeline can be made along pipe lengths fast propagation, and such buckle propagation characteristic is extremely unfavorable for the safe operation of submarine pipeline.
Solve buckle propagation and have two kinds of methods: one is make external pressure lower than buckle propagation pressure, and two is arrange local strengthening device (buckle arrestor).First method can make the bulk strength of pipeline promote by increasing pipeline wall thickness, thus ensures that external pressure is lower than propagation pressure, prevents buckling failure or buckling failure propagation.But increase pipeline wall thickness, while material consumption is increased greatly, also add the weight of suspended span section in process of deployment, although settling mode conservative like this can solve the generation of buckle propagation in theory, but direct or indirect increases cost investment, consider it is worthless at economic angle.And second method, its working principle is by along on length of pipeline direction, a segment distance of being often separated by installs stiffening device one buckle arrestor, and (one carries out local stiffness reinforcement to pipeline, and can prevent cripling from continuing the device propagated along pipe lengths), allow the generation of cripling, but limit flexion scope can only occur between two buckle arrestors, buckle arrestor can not be crossed over, thus prevent pipeline that large-scale buckle propagation occurs to cause tremendous economic to lose, maintain the integrity of pipeline preferably, simultaneously can the requirement of compromise between security and Economy.
The buckle arrestor form of present development mainly contains four kinds, namely buckles into formula, welding type, wrap style and integrated type.
Buckle into formula: be the thick ring that be buckled in pipeline specified position slightly larger than outer diameter tube.
Welding type: to buckle into formula similar, add the weld seam of twice between pipeline and buckle arrestor.
Wrap style: adopt a few reinforcing bars to be closely wrapped in pipeline, in order to fix its position on pipeline, anti-sliding stop, reinforcing bar two ends are welded on pipeline.
Integrated type: the thick ring being also one and pipeline arranged in co-axial alignment, internal radius is equal with internal diameter of the pipeline, and annulus wall thickness is greater than pipeline wall thickness, and link place is through row welding.
For buckling into for formula and wrap style buckle arrestor, although do not need welding, structure is comparatively simple, easy for installation and cost is low, and anti-bend efficiency is low, " U-shaped " easily occurs and passes through, be not suitable for the submarine pipeline of the larger depth of water; In addition, the buckle arrestor of wrap style can increase the external diameter of pipeline.For individual layer pipeline, the diameter increase of intensity reinforcing section pipeline is acceptable.But when pipeline is pipe-in-pipe, because the factor of transport and storage affects, the diameter increase on outer tube is unacceptable.
Although the buckle arrestor of welding type is by having anti-bend effect more better than the formula that buckles into after welding, simultaneously also due to the existence of weld seam, easily generation weld defects and stress are concentrated.Have the integrated buckle arrestor of better anti-bend effect, although be applicable to deep underwater pipes, welding procedure more complicated, existence is welded the weld stress caused and is concentrated the problem with weld defects, and financial cost is also higher than buckling into formula buckle arrestor simultaneously.
Summary of the invention
For the problems referred to above, the object of this invention is to provide a kind of pipe-in-pipe buckle arrestor based on T-shaped section deformation element that can improve deep water pipe-in-pipe bending properties, can prevent deep water pipe-in-pipe from bearing in curling storage, installation, running and bend and the flexing of generation and buckle propagation.
For achieving the above object, the present invention takes following technological scheme:
Perpendicular to pipe lengths being assembled the deformation element that at least one has the symmetrical number of turn.In annular region between the inner and outer pipes that this deformation element is arranged on pipe-in-pipe, its outer surface and outer tube wall have two-point contact at least, and internal surface separates with outer wall of inner tube and do not contact.Can preventing pipe-in-pipe, in bending process, flexing occurs by deformation element, it can being assisted to complete curling for storing, also may be used for ensureing pipe-in-pipe installation and operation process can safety bear certain bending.
The present invention, owing to have employed technique scheme, has the following advantages:
1. the external diameter of pipe-in-pipe just provides enough flexibilities can produce certain bending when local does not increase size, ensure that pipe-in-pipe bears bending ability, may be used for storing easily and lay more efficiently.
2. the buckle arrestor based on T-shaped section deformation element can be assemblied on outer tube by producer before the outer tube of pipe-in-pipe and the assembling of interior pipe, like this need not on-the-spot processing in the process of pipe laying, greatly very high laying efficiency.
3. the buckle arrestor based on T-shaped section deformation element is arranged in the annular region between pipe-in-pipe inner and outer pipes, can not affect original pipe-in-pipe device (usually having insulating assembly etc.) in this region.
4. constitute a caryogram anti-bend device by some T-shaped section deformation elements and plastic shell, this anti-bend device has versatility.Manufacturer does not need to manufacture different caryogram anti-bend devices for different pipelines, and producer directly ready-made caryogram anti-bend device is cut into design size, can be assembled on outer pipe internal surface.And the plastic shell having thermal insulating material to form can improve the heat preservation and insulation of buckle arrestor.
Accompanying drawing explanation
Fig. 1: be the structural representation that in the present invention, pipe-in-pipe installs buckle arrestor
Fig. 2: the schematic cross-section being caryogram anti-bend device in the present invention
Fig. 3: the structural representation being T-shaped section deformation element in the present invention
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
According to Fig. 1 and Fig. 2, in the present invention, the central shaft of rigid pipe 1 is AA, and rigid pipe 1 is pipe-in-pipe type, is made up of interior pipe 2 and outer tube 4.The wall thickness 3 of interior pipe 2, the diameter of interior pipe 2 and material are determined according to the specific requirement used.
Outer tube 4 diameter is enough large, interior pipe 2 can be inserted in.The wall thickness 5 of outer tube 4 is enough to bear the pressure of the medium external world and surrounding residing for rigid pipe.There is an annular region 6 between interior pipe 2 and outer tube 4, be diametric(al) in pipe 2 outer surface to the outer tube 4 internal surface approximately annular region of several centimetres.In double-layer rigid pipe box described above, whole piece rigid pipe all can install spacer ring 7 every a segment distance between interior pipe 2 and outer tube 4.The outer surface closely outer pipe internal surface of spacer ring 7, in design tolerance allowed band, there is a gap 8 between spacer ring 7 outer surface and outer tube 4 internal surface, gap 8 can make to be inserted in interior pipe 2 in outer tube 4.And between spacer ring 7 and interior pipe 2, heat-proof device can be installed.
According to the present invention, whole piece rigid pipe installs one or more caryogram anti-bend device every a segment distance, this caryogram anti-bend device can stop the flexing that outer tube 4 occurs to be propagated.As shown in Figure 1 and Figure 2, each device at least comprises one and is arranged on deformation element 10 in annular region 6, and outer surface 11 and the outer pipe internal surface 12 of deformation element have 2 point cantact at least, make as far as possible the length direction of deformation element outer surface 11 all contacts.A segment distance is then there is between the outer surface 14 of deformation element internal surface 13 and interior pipe 2.This device also comprises a shell, such as, be polymerized shell 15, this polymerization shell 15 is attached on the internal surface 13 of deformation element 10.A space 16 is left between the internal surface 17 of shell 15 and inner tube outer surface 14.This shell 15 is sealings, to strengthen the heat-shielding performance of heat-proof device.
This deformation element 10 as shown in Figure 2, is be made up of the shaped steel wire in T-shaped cross section.Wherein there is space 20 between a lock between adjacent T bar wire ring circle 18 and T bar wire ring 19, between this lock, space 20 auxiliary deformation element 10 when rigid pipe is curled into pipe volume is out of shape (figure does not show).Fig. 3 gives sectional view when T-shaped cross section steel wire interlocks.
The length of deformation element 10, between 0.5m-5m, is cut off by spacer ring 7.Deformation element 10 and shell 15 are assembled together the Standard karyotype anti-bend device in composition pipe-in-pipe.This caryogram anti-bend device at pipe-in-pipe MANUFACTURER place through row processing, can be inserted in outer tube 4, is reinforced on the internal surface 12 of outer tube 4 by appropriate ways after cutting into design size.When reinforcing, preferably the deformation element 10 of first lap and last lap all can be welded on outer pipe internal surface 12, if cannot arrive, at least need last lap deformation element 10 to be welded on outer pipe internal surface 12.
Claims (6)
1., based on a deep water pipe-in-pipe buckle arrestor for T-shaped section deformation element, it adds the caryogram anti-bend device be made up of T-shaped section deformation element, plastic shell and spacer ring in pipe-in-pipe inner and outer pipes annular space.T-shaped section deformation element is interlocked by T-shaped cross section steel wire and forms, and is assemblied on outer pipe internal surface; Plastic shell is fixed on inside T-shaped sectional element, there is a fixed gap with inner tube outer surface; Spacer ring is arranged in the annular region at caryogram buckle arrestor device two ends, its outer surface closely outer tube internal surface but there is gap.
2. a kind of deep water pipe-in-pipe buckle arrestor based on T-shaped section deformation element as claimed in claim 1, is characterized in that: its caryogram anti-bend device is made up of deformation element, plastic shell and spacer ring, its adjustable length, and adjustment range is 0.5m-5m; The spacer ring at caryogram anti-bend device two ends, is directly assembled in annular region (6) after buckle arrestor overall processing.
3. a kind of deep water pipe-in-pipe buckle arrestor based on T-shaped section deformation element as claimed in claim 1 or 2, it is characterized in that: the deformation element that T-shaped cross section steel wire is formed is 90 degree and is wrapped in outer pipe internal surface, its outer surface and outer tube wall have two-point contact at least, and internal surface separates with outer wall of inner tube and do not contact.
4. a kind of deep water pipe-in-pipe buckle arrestor based on T-shaped section deformation element as claimed in claim 1 or 2, is characterized in that: plastic shell is attached on the internal surface of deformation element; For ensureing effect of heat insulation, plastic shell is sealing, thermal insulating material can be selected simultaneously to form plastic shell and improve its thermal insulation property.
5. a kind of deep water pipe-in-pipe buckle arrestor based on T-shaped section deformation element as claimed in claim 1 or 2, it is characterized in that: the spacer ring separated for caryogram anti-bend device two ends there is a gap between its outer surface and outer pipe internal surface and interior pipe can be inserted in outer tube.
6. a kind of deep water pipe-in-pipe buckle arrestor based on T-shaped section deformation element as claimed in claim 1 or 2, is characterized in that: the deformation element that T bar silk is formed, and needs to leave certain gap after its adjacent windings interlocks between two coils.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410608221.7A CN105443865B (en) | 2014-11-03 | 2014-11-03 | A kind of deep water pipe-in-pipe buckle arrestor based on T-type section deformation element |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410608221.7A CN105443865B (en) | 2014-11-03 | 2014-11-03 | A kind of deep water pipe-in-pipe buckle arrestor based on T-type section deformation element |
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| Publication Number | Publication Date |
|---|---|
| CN105443865A true CN105443865A (en) | 2016-03-30 |
| CN105443865B CN105443865B (en) | 2019-07-12 |
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| CN201410608221.7A Expired - Fee Related CN105443865B (en) | 2014-11-03 | 2014-11-03 | A kind of deep water pipe-in-pipe buckle arrestor based on T-type section deformation element |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5458441A (en) * | 1991-04-23 | 1995-10-17 | Shell Oil Company | Pipe section for installation into a subsea pipeline |
| US20060032036A1 (en) * | 1999-07-02 | 2006-02-16 | Coflexip | Device for arresting the propagation of a buckle in a double-walled pipe |
| WO2010136801A1 (en) * | 2009-05-26 | 2010-12-02 | Pipeline Engineering & Supply Company Limited | Bend restrictor |
| CN103090125A (en) * | 2013-01-22 | 2013-05-08 | 中国海洋石油总公司 | Composite flexible pipe anti-compression armor layer |
| CN204704478U (en) * | 2014-11-03 | 2015-10-14 | 中国石油大学(北京) | Based on the deep water pipe-in-pipe buckle arrestor of T-shaped section deformation element |
-
2014
- 2014-11-03 CN CN201410608221.7A patent/CN105443865B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5458441A (en) * | 1991-04-23 | 1995-10-17 | Shell Oil Company | Pipe section for installation into a subsea pipeline |
| US20060032036A1 (en) * | 1999-07-02 | 2006-02-16 | Coflexip | Device for arresting the propagation of a buckle in a double-walled pipe |
| WO2010136801A1 (en) * | 2009-05-26 | 2010-12-02 | Pipeline Engineering & Supply Company Limited | Bend restrictor |
| CN103090125A (en) * | 2013-01-22 | 2013-05-08 | 中国海洋石油总公司 | Composite flexible pipe anti-compression armor layer |
| CN204704478U (en) * | 2014-11-03 | 2015-10-14 | 中国石油大学(北京) | Based on the deep water pipe-in-pipe buckle arrestor of T-shaped section deformation element |
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| CN105443865B (en) | 2019-07-12 |
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Inventor after: Chen Yanfei Inventor after: Dong Shaohua Inventor after: Zhang Hong Inventor after: Xia Mengying Inventor after: Zhang Qi Inventor after: Liang Lecai Inventor after: Liu Xiaoben Inventor before: Chen Yanfei Inventor before: Zhang Hong Inventor before: Xia Mengying Inventor before: Liang Lecai Inventor before: Liu Xiaoben |
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Granted publication date: 20190712 Termination date: 20211103 |