WO2020006947A1 - 一种碳素钢-混凝土/水泥砂浆-不锈钢复合海底管道 - Google Patents

一种碳素钢-混凝土/水泥砂浆-不锈钢复合海底管道 Download PDF

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WO2020006947A1
WO2020006947A1 PCT/CN2018/113507 CN2018113507W WO2020006947A1 WO 2020006947 A1 WO2020006947 A1 WO 2020006947A1 CN 2018113507 W CN2018113507 W CN 2018113507W WO 2020006947 A1 WO2020006947 A1 WO 2020006947A1
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concrete
stainless steel
steel pipe
carbon steel
cement mortar
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English (en)
French (fr)
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王法承
于清
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Tsinghua University
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Tsinghua University
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Priority to US17/257,174 priority Critical patent/US11592124B2/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B32B1/08—Tubular products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B13/00—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material
    • B32B13/04—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material comprising such water setting substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B13/06—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material comprising such water setting substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/18—Layered products comprising a layer of metal comprising iron or steel
    • 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
    • F16L9/00—Rigid pipes
    • F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
    • F16L9/153—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups comprising only layers of metal and concrete with or without reinforcement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/03—3 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/10—Inorganic particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/304—Insulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/552—Fatigue strength
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2597/00—Tubular articles, e.g. hoses, pipes

Definitions

  • the invention belongs to the technical field of marine structure engineering, and particularly relates to a carbon steel-concrete / cement mortar-stainless steel composite subsea pipeline.
  • Submarine pipelines are an important structural component of offshore oil and gas development. Through material strength and corrosion resistance, the transmission medium inside the pipeline is protected from the complex environment outside the pipeline and inside the pipeline, which guarantees the uninterrupted transmission of oil and gas and other resources. Important tasks for some oil and gas fields.
  • submarine pipelines are affected by internal or external, man-made or natural factors, and structural damage and material aging may occur. The accumulation of such damage may lead to accidents such as fracture and damage of submarine pipelines and corrosion leakage.
  • the carbon steel pipe is generally not considered because it is connected to the carbon steel pipe through mechanical composite and outer bonding, which makes it difficult for the bimetal composite pipe to meet the mechanical properties in harsh environments. Requirements.
  • the purpose of the present invention is to overcome the shortcomings of the prior art and provide a carbon steel-concrete / cement mortar-stainless steel composite subsea pipeline structure.
  • the present invention can significantly improve the overall mechanical properties and corrosion resistance of the pipeline, and With thermal insulation performance.
  • the carbon steel-concrete / cement mortar-stainless steel composite subsea pipeline proposed by the present invention is characterized by splicing a plurality of composite sub-pipes arranged in turn along the axial direction of the pipeline, and the structure of each composite sub-pipe is the same It includes an outer carbon steel pipe and an inner stainless steel pipe which have a circular cross section and are placed concentrically.
  • the outer carbon steel pipe and the inner stainless steel pipe are filled with concrete or cement mortar to form a sandwich structure with a circular ring cross section. .
  • the adjacent two composite sub-pipes are connected in the following manner: the axial length of the inner stainless steel pipes of the two composite sub-pipes at the joints exceeds the first length of the outer carbon steel pipe and the sandwich structure, and the inner layer After the stainless steel pipes are aligned, ring welding is used; the two connecting structures that are 2 times the first length are respectively covered on the two outer sides of the inner stainless steel pipe at the joint, and each of the connecting structures is concentrically placed inner concrete or cement mortar.
  • the half-ring and the outer carbon steel half-ring are integrally formed, and the inner side of the inner concrete or cement mortar half-ring is in close contact with the outer side of the inner stainless steel pipe at the joint; the two outer carbon steel half-rings After the alignment, the axial welding is performed; after the two outer carbon steel semi-circles and the outer carbon steel pipes of the composite sub-pipes on both sides are aligned, the circumferential welding is performed.
  • the beneficial effects of the present invention are: the combined effect of sandwich concrete or cement mortar and inner and outer steel pipes can significantly improve the overall mechanical properties of the pipeline; the material characteristics of the inner stainless steel pipe provide excellent corrosion resistance; and the use of concrete or cement mortar provides Certain thermal insulation performance; by covering the welds of the inner pipe with concrete or cement mortar, the fatigue performance of the inner stainless steel pipe at the weld can be effectively improved.
  • the hollow stainless steel concrete-filled steel tube concrete subsea pipeline structure of the inner layer of the present invention can be applied to the marine environment with severe service environment and oil and gas corrosion.
  • FIG. 1 is a schematic cross-sectional view of a composite sub-pipe in an embodiment of the present invention
  • FIG. 2 is a schematic diagram of connection between two adjacent composite sub-pipes in the embodiment of the present invention.
  • a carbon steel-concrete / cement mortar-stainless steel composite submarine pipeline according to the embodiment of the present invention is formed by splicing a plurality of composite sub-pipes sequentially arranged along the axial direction of the pipeline.
  • Each composite sub-pipe has the same structure.
  • each of which includes an outer carbon steel pipe 1 and an inner stainless steel pipe 3 which have a circular cross section and are placed concentrically.
  • the outer carbon steel pipe 1 and the inner stainless steel pipe 3 are filled with concrete or cement mortar to form a ring.
  • the outer carbon steel pipe 1 has a diameter of 6-60 inches, and the ratio of diameter to wall thickness is 45 or less.
  • the minimum value of the ratio of diameter to wall thickness is determined by economics and product technology, and is generally greater than 15.
  • the ratio of the diameter of the outer carbon steel pipe 1 to the diameter of the inner stainless steel pipe 3 is 0.25 to 0.75.
  • the filling material is concrete or cement mortar.
  • the thickness of the sandwich structure 2 is greater than or equal to 30 mm.
  • the maximum thickness of the sandwich structure 2 satisfies the range of the ratio of the diameter of the outer carbon steel pipe 1 to the diameter of the inner stainless steel pipe 3.
  • the thickness of the sandwich structure 2 is generally required to be equal to or greater than three times the particle size of the aggregate in the concrete.
  • the thickness of the inner stainless steel pipe 3 is not less than 2mm.
  • the ratio D o / t o between the diameter D o and the wall thickness t o of the outer carbon steel pipe 1 is smaller than the ratio D i / t i between the diameter D i and the wall thickness t i of the inner stainless steel pipe 3 to ensure the limit load of axial pressure
  • the outer carbon steel pipe reaches its ultimate axial load carrying capacity before the inner stainless steel pipe.
  • connection mode between two adjacent composite sub-pipes is shown in FIG. 2.
  • the axial length of the inner stainless steel pipe 3 of the two composite sub-pipes at the connection exceeds the outer carbon steel pipe 1.
  • sandwich structure 2 about 200-400mm (planned according to the specific project, this embodiment is 250mm)
  • the inner layer of stainless steel pipe 3 is aligned using circle a welding, and the length is about 400-800mm (according to the specific project, this implementation (E.g.
  • connection structures covering the two outer sides of the inner stainless steel pipe 3 at the connection
  • both connection structures are made of concentrically placed inner concrete or cement mortar semicircles 4 and outer carbon steel semicircles Ring 5 (the size of the outer carbon steel semi-circle is the same as the size of the outer carbon steel pipe on both sides), and the inner side of the inner concrete or cement mortar semi-ring 4 and the inner stainless steel tube at the connection 3
  • the outer sides are in close contact, and then the two outer carbon steel semi-circles 5 are aligned to perform axial b welding. Finally, the two outer carbon steel semi-circles 5 and the composite sub-pipes on both sides are welded. After the outer carbon steel pipe 1 is aligned, the hoop c welding is performed.
  • Each component in the embodiment of the present invention is obtained by a conventional preparation process using commercially available materials, wherein the concrete is any one of ordinary concrete, light aggregate concrete, or recycled concrete.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

一种碳素钢-混凝土/水泥砂浆-不锈钢复合海底管道，属于海洋结构工程技术领域。该复合海底管道由沿该管道轴向依次设置的若干个复合子管道拼接而成，各复合子管道结构相同，均包括具有圆形横截面且同心放置的外层碳素钢管和内层不锈钢管，外层碳素钢管和内层不锈钢管之间填充混凝土或水泥砂浆形成具有圆环形横截面的夹层结构。相邻的两复合子管道之间通过混凝土/水泥砂浆覆盖内层不锈钢管道焊缝，可以有效提高焊缝处内层不锈钢管的疲劳性能。

Description

一种碳素钢-混凝土/水泥砂浆-不锈钢复合海底管道 技术领域
本发明属于海洋结构工程技术领域，具体涉及一种碳素钢-混凝土/水泥砂浆-不锈钢复合海底管道。
背景技术
海底管道是海洋油气开发的一种重要结构组成，通过材料强度和耐腐蚀特性，保护管道内传输介质免受管道外和管内复杂环境的影响，保障了油气等资源的不间断传输，承担着大部分油气田输送的重要任务。但是，在服役过程中，海底管道受到内部或外部、人为或自然因素的影响，可能发生结构损伤与材料老化，这种损伤的积累可能导致海底管道发生断裂破坏、腐蚀泄漏等事故。近年来，油气介质中二氧化碳(CO 2)或硫化氢(H 2S)易腐蚀成分变化造成管道腐蚀泄漏、海洋活动产生落锚造成管道结构损伤等事故日益频繁，尽管海底管道技术经过长足的发展，但目前海底管道结构形式难以满足力学性能和耐腐蚀性的要求，事故日益增加。比如传统单层和双层海底管道，在传输含有一定二氧化碳(CO 2)或硫化氢(H 2S)成分的油气介质时，通过设计腐蚀裕量的方法难以满足耐腐蚀性要求。双金属复合管，通过内层不锈钢管提升结构耐腐蚀性。但内层不锈钢管和外层混凝土在计算管道整体力学性能时，因其分别通过机械复合和外包粘结连接碳素钢管，一般不作考虑，使得双金属复合管在恶劣环境下可能难以满足力学性能的要求。
发明内容
本发明的目的是为了克服已有技术的不足之处，提供一种碳素钢-混凝土/水泥砂浆-不锈钢复合海底管道结构，本发明可显著提高管道整体的力学性能和耐腐蚀性，又兼具保温性能。
为实现上述目的，本发明采用的技术方案如下：
本发明提出的一种碳素钢-混凝土/水泥砂浆-不锈钢复合海底管道，其特征在于，由沿该管道轴向依次设置的若干个复合子管道拼接而成，各复合子管道结构相同，均包括具有圆形横截面且同心放置的外层碳素钢管和内层不锈钢管，所述外层碳素钢管和内层不锈钢管之间填充混凝土或水泥砂浆形成具有圆环形横截面的夹层结构。
进一步地，相邻两所述复合子管道之间按照以下方式连接：连接处的两个复合子管道的内层不锈钢管轴向长度均超出外层碳素钢管和夹层结构第一长度，内层不锈钢管对准后采用环向焊接；将长为2倍第一长度的两个连接结构分别覆盖在连接处的内层不锈钢管两外侧，各连接结构均由同心放置的内层混凝土或水泥砂浆半圆环和外层碳素钢半圆环一体 成型，且内层混凝土或水泥砂浆半圆环的内侧与连接处的内层不锈钢管外侧紧密接触；将两个外层碳素钢半圆环对准后进行轴向焊接；将焊接好的两个外层碳素钢半圆环和两侧复合子管道的外层碳素钢管对准后进行环向焊接。
本发明的有益效果为：夹层混凝土或水泥砂浆与内外钢管的组合作用，可显著提高管道整体的力学性能；内层不锈钢管的材料特性提供了优异的耐腐蚀性；采用混凝土或水泥砂浆提供了一定的的保温性能；通过混凝土或水泥砂浆覆盖内层管道焊缝，可以有效提高焊缝处内层不锈钢管的疲劳性能。本发明的内层不锈钢的中空夹层钢管混凝土海底管道结构可应用于服役环境恶劣和油气腐蚀的海洋环境中。
附图说明
图1是本发明实施例中复合子管道的横截面示意图；
图2是本发明实施例中相邻两复合子管道的连接示意图。
具体实施方式
以下结合附图和实施例对本发明进一步详细说明如下：
本发明实施例的一种碳素钢-混凝土/水泥砂浆-不锈钢复合海底管道，由沿该管道轴向依次设置的若干个复合子管道拼接而成，各复合子管道结构相同，其横截面参见图1，均包括具有圆形横截面且同心放置的外层碳素钢管1和内层不锈钢管3，外层碳素钢管1和内层不锈钢管3之间填充混凝土或水泥砂浆形成具有圆环形横截面的夹层结构2。
外层碳素钢管1直径在6-60寸，直径与壁厚比小于等于45，直径与壁厚比的最小值由经济性和产品工艺决定，一般大于15。外层碳素钢管1直径与内层不锈钢管3直径比值为0.25～0.75。填充物为混凝土或者水泥砂浆，夹层结构2厚度大于等于30mm，夹层结构2厚度的最大值满足外层碳素钢管1直径与内层不锈钢管3直径比取值范围。当夹层填充混凝土时，一般要求夹层结构2厚度大于等于混凝土中骨料粒径的3倍。内层不锈钢管3壁厚不小于2mm。外层碳素钢管1直径D o与其壁厚t o的比值D o/t o小于内层不锈钢管3直径D i与其壁厚t i的比值D i/t i，以保障轴压极限荷载作用下，外层碳素钢管先于内层不锈钢管达到其极限轴向承载能力。
进一步地，本发明实施例中相邻两复合子管道之间的连接方式如图2所示，连接处的两个复合子管道的内层不锈钢管3轴向长度均超出外层碳素钢管1和夹层结构2约200-400mm(根据具体工程拟定，本实施例为250mm)，内层不锈钢管3对准后采用环向a焊接，将长约为400-800mm(根据具体工程拟定，本实施例为500mm)的两个连接结构分别覆盖在连接处的内层不锈钢管3两外侧，两个连接结构均由同心放置的内层混凝土或水 泥砂浆半圆环4和外层碳素钢半圆环5(该外层碳素钢半圆环的尺寸与两侧外层碳素钢管的尺寸相等)一体成型，且内层混凝土或水泥砂浆半圆环4的内侧与连接处的内层不锈钢管3外侧紧密接触，再将两个外层碳素钢半圆环5对准后进行轴向b焊接，最后将焊接好的两个外层碳素钢半圆环5和两侧复合子管道的外层碳素钢管1对准后进行环向c焊接。
本发明实施例中的各组成部件均采用市售材料通过常规制备工艺得到，其中，混凝土采用普通混凝土、轻骨料混凝土或再生混凝土中的任意一种。
以上所述仅为本发明的较佳实施例而已，并非限定本发明的保护范围，凡在本发明的精神和原则之内所做的任何修改、等同替换、改进等，均包含的本发明的保护范围内。

Claims (4)

  1. 一种碳素钢-混凝土/水泥砂浆-不锈钢复合海底管道，其特征在于，由沿该管道轴向依次设置的若干个复合子管道拼接而成，各复合子管道结构相同，均包括具有圆形横截面且同心放置的外层碳素钢管和内层不锈钢管，所述外层碳素钢管和内层不锈钢管之间填充混凝土或水泥砂浆形成具有圆环形横截面的夹层结构。
  2. 根据权利要求1所述的碳素钢-混凝土/水泥砂浆-不锈钢复合海底管道，其特征在于，相邻两所述复合子管道之间按照以下方式连接：连接处的两个复合子管道的内层不锈钢管轴向长度均超出外层碳素钢管和夹层结构第一长度，内层不锈钢管对准后采用环向焊接；将长为2倍第一长度的两个连接结构分别覆盖在连接处的内层不锈钢管两外侧，各连接结构均由同心放置的内层混凝土或水泥砂浆半圆环和外层碳素钢半圆环一体成型，且内层混凝土或水泥砂浆半圆环的内侧与连接处的内层不锈钢管外侧紧密接触；将两个外层碳素钢半圆环对准后进行轴向焊接；将焊接好的两个外层碳素钢半圆环和两侧复合子管道的外层碳素钢管对准后进行环向焊接。
  3. 根据权利要求2所述的碳素钢-混凝土/水泥砂浆-不锈钢复合海底管道，其特征在于，所述第一长度的取值为200-400mm。
  4. 根据权利要求1～3中任意一项所述的碳素钢-混凝土/水泥砂浆-不锈钢复合海底管道，其特征在于，所述混凝土采用普通混凝土、轻骨料混凝土或再生混凝土中的任意一种。
PCT/CN2018/113507 2018-07-02 2018-11-01 一种碳素钢-混凝土/水泥砂浆-不锈钢复合海底管道 Ceased WO2020006947A1 (zh)

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