CN102943925B - Deepwater subsea pipeline flexion stopper - Google Patents
Deepwater subsea pipeline flexion stopper Download PDFInfo
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- CN102943925B CN102943925B CN201210407413.2A CN201210407413A CN102943925B CN 102943925 B CN102943925 B CN 102943925B CN 201210407413 A CN201210407413 A CN 201210407413A CN 102943925 B CN102943925 B CN 102943925B
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Abstract
The invention relates to a deepwater subsea pipeline flexion stopper. The deepwater subsea pipeline flexion stopper is characterized by comprising a flexion stopper body, wherein the flexion stopper body is a cylindrical shell; the internal diameter of the flexion stopper body is smaller than that of a subsea pipeline; the flexion stopper body is sequentially divided into first-level steps, second-level steps and a third-level step from a small external diameter to a large external diameter; the third-level step is positioned on the middle part of the flexion stopper body; the second-level steps are arranged on the two sides of the third-level step; the first-level steps are arranged on the other sides of the two second-level steps; the external diameters of the first-level steps are smaller than the internal diameter of the subsea pipeline; the external diameters of the second-level steps are equal to that of the subsea pipeline; and the external diameter of the third-level step is larger than that of the subsea pipeline. In a welding process of the deepwater subsea pipeline flexion stopper, complicated technical requirements are avoided; the first-level steps can be used as sunk pads during butt welding with the subsea pipeline, so that the welding quality of the subsea pipeline can be improved and the flexion stopping capability of the deepwater subsea pipeline flexion stopper can be improved; and when used in a deepwater environment, the deepwater subsea pipeline flexion stopper has higher flexion stopping capability, greatly reduces the welding quality, and can be widely applied to the subsea pipeline in the deepwater environment.
Description
Technical field
The present invention relates to a kind of buckle arrestor, particularly about a kind of buckle arrestor be connected with deep-water subsea pipeline.
Background technique
Submarine pipeline is oil gas transfer ways important in Offshore Engineering, and its safe operation guarantees that offshore oil and gas produces the key of carrying out smoothly.Deep-water subsea pipeline lays the marine site depth of water comparatively greatly due to it, will bear huge hydrostatic pressure.Deep underwater pipes is laid in the shock that sea bed may suffer the weight-drop such as anchor, and this will cause the geometrical defect of self; Carry deep fat liquid to form pipeline internal-external temperature difference in the low temperature environment of deep water and pipe, pipeline can be made to produce axial deformation; In pipe laying process, irrational operation may cause vertical curved segment moment of flexure excessive; Special ocean environment and conveying liquid may form local etching to pipeline.All factors all may cause the cripling conquassation of deep underwater pipes above.When after the conquassation of pipeline generation cripling, if outer hydraulic pressure exceedes certain pressure, the conquassation form of pipeline will spread along pipe range direction to both sides, cause the destruction of whole piece pipeline, this phenomenon is exactly buckle propagation phenomenon, and the minimum pressure outside maintained required for pipeline buckle propagation is exactly buckle propagation pressure.
Buckle propagation, once occur, it be made to stop, then will possess one of following two conditions: external pressure is down to below buckle propagation pressure, or buckle propagation suffers the physical obstacle that it cannot pass through.Because the buckle propagation pressure of pipeline is generally significantly less than its flexing collapse pressure, from previous condition, with buckle propagation pressure for stability Design criterion designs pipeline, make external pressure suffered by pipeline always lower than its buckle propagation pressure, this increases greatly by making the wall thickness of pipeline, is obviously very uneconomic.Therefore, effective physical obstacle is set, stops buckle propagation, become the Main Means of reply pipeline buckle propagation problem.The structure of this suppression buckle propagation is exactly buckle arrestor.
Effective buckle arrestor can successfully prevent flexing along the propagation of pipeline axial, and the flexing conquassation that pipeline is occurred occurs over just between two buckle arrestors, thus avoids whole piece pipeline to wreck.The citation form of buckle arrestor is a thick ring, and current conventional buckle arrestor, according to the difference of installation form, can be divided into the formula of buckling into, wrap style and integrated buckle arrestor.The formula buckle arrestor of buckling into first is screwed into pipeline specified position and then directly clamps, wrap style buckle arrestor is wound around at the specified position of pipeline, the internal diameter of integrated buckle arrestor is the same with the internal diameter of pipeline, and wall ratio pipeline is thicker, and both weld in joint after coaxially sequencing.On the basis buckling into formula buckle arrestor, the connection between itself and pipeline adds twice weld seam, can form welding type buckle arrestor.From anti-bend performance, the anti-bend effect of integrated buckle arrestor is best, but higher to welding process requirement, installs complicated, and heavier-weight.Buckle into formula and welding type buckle arrestor structure simple, easily manufactured, but anti-bend efficiency is lower, is not suitable for deep underwater pipes.The situation of wrap style buckle arrestor with buckle into formula buckle arrestor broadly similar, be also unsuitable for deep underwater pipes and use.
Although engineering there are above-mentioned three kinds of conventional submarine pipeline bending arrestors, wrap style, buckle into formula (comprising the welding type extended) buckle arrestor and, mostly for the protection of shallow water submarine pipeline, be not suitable for deep water engineering.At present the submarine pipeline bending arrestor form of conventional deep water engineering is more single, and only integrated buckle arrestor is a kind of, although and integrated buckle arrestor structure is simple, need wielding neck, this point is very high to welding process requirement.When bending deformation propagates into buckle arrestor front end, because deep water buckle arrestor wall thickness is larger, significant distortion can not be there is before and after buckle propagation passes through, this will produce very strong bending and axial force to buckle arrestor front end weld seam, the force environment of this complexity requires higher than the weldquality of general mesohigh pressurized container.Correspondingly, weld seam occurs that the possibility destroyed is also just very large, and light damage is only that weld seam trachoma is communicated with, and under the acting in conjunction of hydraulic pressure and interior pressure outside, small leaks occurs; During heavy damage, weld joint there will be crack even breach, and this will cause serious leakage accident.Therefore the deep underwater pipes buckle arrestor designing a kind of welding quality requirement lower is very necessary.
Summary of the invention
For the problems referred to above, the object of this invention is to provide one and be both conducive to improving pipeline welding quality, there is again the deepwater subsea pipeline flexion stopper of higher anti-bend ability.
For achieving the above object, the present invention takes following technological scheme: a kind of deepwater subsea pipeline flexion stopper, it is characterized in that: it comprises buckle arrestor body, described buckle arrestor body is cylindrical shell, the internal diameter of described buckle arrestor body is less than the internal diameter of submarine pipeline, and the external diameter of described buckle arrestor body is divided into first order ladder, second level ladder and third level ladder successively according to order from small to large; Described third level ladder is positioned at the middle part of described buckle arrestor body, and the both sides of described third level ladder are described second level ladder, and the opposite side of two described second level ladders is first order ladder; The external diameter of described first order ladder is less than the internal diameter of described submarine pipeline, and the external diameter of described second level ladder is identical with the external diameter of described submarine pipeline, and the external diameter of described third level ladder is greater than the external diameter of described submarine pipeline.
The length of the first order ladder of described buckle arrestor body is the external diameter of the described submarine pipeline of 0.25 times; The wall thickness of described first order ladder is the wall thickness of the described submarine pipeline of 1 ~ 2 times; External diameter 0.5 ~ the 2mm less of the internal diameter of described submarine pipeline of described first order ladder, the end position that described first order ladder inserts described submarine pipeline is processed into the mild slope angle of 30 °.
The length of the second level ladder of described buckle arrestor body is the external diameter of the described submarine pipeline of 0.25 times; The wall thickness of described second level ladder is the wall thickness of the described submarine pipeline of 2 ~ 3 times; The internal diameter of described second level ladder is consistent with the internal diameter of described first order ladder; The joint of described second level ladder and described first order ladder is the weld with described submarine pipeline, and described second level ladder opens groove at 45 ° near the end of weld seam.
The length of the third level ladder of described buckle arrestor body is the external diameter of the described submarine pipeline of 0.5 times; The wall thickness of described third level ladder is the wall thickness of the described submarine pipeline of 3 ~ 5 times; The internal diameter of described third level ladder is consistent with the internal diameter of described first order ladder.
The present invention is owing to taking above technological scheme, it has the following advantages: 1, the present invention is compared with the integrated buckle arrestor being usually used in deep water, distribution of material has remarkable difference, the all material of integrated buckle arrestor is distributed in the region beyond submarine pipeline internal diameter, and two first order ladders of the present invention insert in submarine pipeline respectively, its material about has 30% ~ 50% to be distributed in region within submarine pipeline internal diameter; For cylindrical shell, radius-thickness ratio is less, and anti-flexural property is better; Therefore, under the prerequisite of equivalent material, this distribution of material mode of the present invention will improve its anti-bend ability.2, instant invention overcomes the deficiency of deep water integrated buckle arrestor welding requirements complexity: overall buckle arrestor requires that buckle arrestor internal diameter is equal with internal diameter of the pipeline, implements wielding neck during installation; Deep underwater pipes buckle arrestor requires to have higher anti-bend efficiency, corresponding integrated buckle arrestor wall thickness is larger, significant distortion is there is not when passing through, when this makes bending deformation propagate into buckle arrestor front end, very large bending and axial force can be born in weld joint, buckle arrestor front end, is easy to destroy; First order ladder of the present invention stretches into submarine pipeline inside, and buckle propagation is close to submarine pipeline, and first order ladder moves forward to the region be subject to compared with macrobending and axial force, and butt welded seam place plays a protective role.3, the present invention is in welded and installed process, and the existence of first order ladder also can, as the mat of welding, make the operation easier obtaining better welding quality lower.4, the 3rd step wall thickness of the present invention is comparatively large, and its external diameter is greater than submarine pipeline external diameter, and internal diameter is less than submarine pipeline internal diameter, is the region that hoop rigidity of the present invention is the strongest, is the core of anti-bend ability of the present invention; By the transition of the first two step of the present invention, the advantage of the large wall thickness of the present invention can not be played by weldquality puzzlement, and can arrange the wall thickness larger than integrated buckle arrestor, therefore, the present invention can be used in ultra-deep-water environment.5, the present invention in the most adverse case, even if when destroying appears in weld seam, due to the existence of first order ladder, can limit the leakage rate of submarine pipeline, reduces the consequence that may bring.6, the end position of first order ladder insertion submarine pipeline of the present invention has carried out 30 ° of slope angle process, therefore, can reduce the interference to submarine pipeline fluid flow inside, also be convenient to the work of wiper simultaneously.Welding process of the present invention does not need complicated technological requirement, and first order ladder of the present invention can as with mat during submarine pipeline butt welding, be both conducive to the welding quality improving submarine pipeline, and be beneficial to again and improve anti-bend ability of the present invention; The present invention has higher anti-bend performance when deepwater environment uses than integrated buckle arrestor, and greatly reduces the welding difficulty of integrated buckle arrestor, can be widely used on the submarine pipeline in deepwater environment.
Accompanying drawing explanation
Fig. 1 is the general perspective view that the present invention is used in certain section of submarine pipeline
Fig. 2 is the A-A schematic cross-section shown in Fig. 1
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
As shown in Figure 1 and Figure 2, the present invention includes buckle arrestor body 1, buckle arrestor body 1 is cylindrical shell, the internal diameter of buckle arrestor body 1 is less than the internal diameter of submarine pipeline 2, the external diameter of buckle arrestor body 1 is different, is divided into first order ladder 3, second level ladder 4 and third level ladder 5 successively according to order from small to large.Third level ladder 5 is positioned at the middle part of buckle arrestor body 1, and the opposite side that the both sides of third level ladder 5 are second level ladder 4, two second level ladders 4 is first order ladder 3.Meanwhile, the external diameter of first order ladder 3 is less than the internal diameter of submarine pipeline 2, and the external diameter of second level ladder 4 is identical with the external diameter of submarine pipeline 2, and the external diameter of third level ladder 5 is greater than the external diameter of submarine pipeline 2.
As shown in Figure 1, the length of the first order ladder 3 of buckle arrestor body 1 of the present invention is the external diameter of the submarine pipeline 2 of 0.25 times; The wall thickness of first order ladder 3 is the wall thickness of the submarine pipeline 2 of 1 ~ 2 times; The internal diameter of first order ladder 3 is less than the internal diameter of submarine pipeline 2; External diameter 0.5 ~ the 2mm less of the internal diameter of submarine pipeline 2 of first order ladder 3, is convenient to insert submarine pipeline 2 when mounted smoothly inner.The end position that first order ladder 3 inserts submarine pipeline 2 is processed into the mild slope angle of 30 °, is convenient to the fluid flowing in submarine pipeline 2 and pigging operations.
As shown in Figure 1, the length of the second level ladder 4 of buckle arrestor body 1 of the present invention is the external diameter of the submarine pipeline 2 of 0.25 times; The wall thickness of second level ladder 4 is the wall thickness of the submarine pipeline 2 of 2 ~ 3 times; The internal diameter of second level ladder 4 is less than the internal diameter of submarine pipeline 2, and consistent with the internal diameter of first order ladder 3; The external diameter of second level ladder 4 is consistent with the external diameter of submarine pipeline 2.Second level ladder 4 is the weld with submarine pipeline 2 with the joint of first order ladder 3, and second level ladder 4 opens groove at 45 ° near the end of weld seam 6, for the wielding neck with submarine pipeline 2.
As shown in Figure 1, the length of the third level ladder 5 of buckle arrestor body 1 of the present invention is the external diameter of the submarine pipeline 2 of 0.5 times; The wall thickness of third level ladder 5 is the wall thickness of the submarine pipeline 2 of 3 ~ 5 times; The internal diameter of third level ladder 5 is less than the internal diameter of submarine pipeline 2, and consistent with the internal diameter of first order ladder 3; The external diameter of third level ladder 5 is greater than the external diameter of submarine pipeline 2.
Material of the present invention can adopt the API 5L X65 type of material identical with deep-water subsea pipeline 2 or more high-grade X70, X80 grade steel; Its main function is to prevent the buckle propagation of submarine pipeline 2 under complex environment and load, ensures the safety of whole piece pipeline.
Fabrication and installation method of the present invention comprises the following steps.
1), when carrying out engineer applied of the present invention, wall thickness should be selected to reach the wall thickness of third level ladder 5, and external diameter is consistent with the external diameter of third level ladder 5 or close, and the pipe fitting that material is applicable to, cutting obtains the blank of the length of 1.5 times of submarine pipeline 2 diameters.
2) on lathe or milling machine, process many steps cylindrical shell pattern as shown in Figure 1 and 60 ° of slope angles.Consider that bevel for welding will be opened at pipe laying scene, therefore, when making of the present invention, the transition slope angle between second level ladder 4 and first order ladder 3 should be made and be a bit larger tham this angle, advises more than 60 °.
3) during pipe laying, two first order ladders 3 of the present invention are inserted in two submarine pipelines 2 respectively, with submarine pipeline 2 contraposition at two ends, with first order ladder 3 for liner, implement the wielding neck under liner condition, along submarine pipeline 2 axially every 50 ~ 100m(depending on the depth of water, environment and every root tubular length) the present invention is set.
The various embodiments described above are only for illustration of the present invention, and wherein the structure, Placement etc. of each parts all can change to some extent, and every equivalents of carrying out on the basis of technical solution of the present invention and improvement, all should not get rid of outside protection scope of the present invention.
Claims (1)
1. a deepwater subsea pipeline flexion stopper, it is characterized in that: it comprises the buckle arrestor body of a cylindrical shell shape, described buckle arrestor body becomes large by two ends successively to middle part external diameter, form respectively first order ladder, second level ladder and third level ladder, the external diameter of described first order ladder is less than the internal diameter of described submarine pipeline, the external diameter of described second level ladder is identical with the external diameter of described submarine pipeline, and the external diameter of described third level ladder is greater than the external diameter of described submarine pipeline; Described first order ladder inserts submarine pipeline, described second level ladder and submarine pipeline wielding neck; The length inserting the described first order ladder of submarine pipeline is the external diameter of the submarine pipeline of 0.25 times; The wall thickness of described first order ladder is the wall thickness of the described submarine pipeline of 1 ~ 2 times; External diameter 0.5 ~ the 2mm less of the internal diameter of described submarine pipeline of described first order ladder, the end position that described first order ladder inserts described submarine pipeline is processed into the mild slope angle of 30 °; The length of the second level ladder of described buckle arrestor body is the external diameter of the described submarine pipeline of 0.25 times; The wall thickness of described second level ladder is the wall thickness of the described submarine pipeline of 2 ~ 3 times; The internal diameter of described second level ladder is consistent with the internal diameter of described first order ladder; The joint of described second level ladder and described first order ladder is the weld with described submarine pipeline, and described second level ladder opens groove at 45 ° near the end of weld seam; The length of described third level ladder is the external diameter of the described submarine pipeline of 0.5 times; The wall thickness of described third level ladder is the wall thickness of the described submarine pipeline of 3 ~ 5 times; The internal diameter of described third level ladder is consistent with the internal diameter of described first order ladder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210407413.2A CN102943925B (en) | 2012-10-23 | 2012-10-23 | Deepwater subsea pipeline flexion stopper |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210407413.2A CN102943925B (en) | 2012-10-23 | 2012-10-23 | Deepwater subsea pipeline flexion stopper |
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| CN102943925A CN102943925A (en) | 2013-02-27 |
| CN102943925B true CN102943925B (en) | 2015-01-21 |
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| CN201210407413.2A Active CN102943925B (en) | 2012-10-23 | 2012-10-23 | Deepwater subsea pipeline flexion stopper |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104500837B (en) * | 2014-11-25 | 2016-08-17 | 天津大学 | The device of lateral displacement control is carried out during submarine pipeline complete buckling |
| CN107687558B (en) * | 2017-09-04 | 2020-02-18 | 中国海洋大学 | Combined buckle arrestor for submarine fiber reinforced composite flexible pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1872271A (en) * | 1928-07-16 | 1932-08-16 | Smith Corp A O | Pipe joint |
| US2037962A (en) * | 1933-06-15 | 1936-04-21 | Brown Edmund | Pipe joint and method of making the same |
| US3768269A (en) * | 1972-04-07 | 1973-10-30 | Shell Oil Co | Mitigation of propagating collapse failures in pipelines due to external load |
| CN201159346Y (en) * | 2008-01-04 | 2008-12-03 | 詹韬 | Novel connecting structure for thin wall stainless steel tube |
| CN201802977U (en) * | 2010-08-31 | 2011-04-20 | 上海利策科技有限公司 | Novel pipe-in-pipe buckle arrestor |
| CN201909110U (en) * | 2010-11-17 | 2011-07-27 | 中国海洋石油总公司 | Buckling restraining device for deepwater double-layer submarine pipeline |
| CN202901534U (en) * | 2012-10-23 | 2013-04-24 | 中国海洋石油总公司 | Deepwater submarine pipeline buckle arrestor |
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Address after: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee after: CNOOC research institute limited liability company Patentee after: China Offshore Oil Group Co., Ltd. Co-patentee after: Tianjin University Address before: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee before: CNOOC Research Institute Patentee before: China National Offshore Oil Corporation Co-patentee before: Tianjin University |
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