CN112648436B

CN112648436B - Bundling submarine pipeline

Info

Publication number: CN112648436B
Application number: CN202011593319.1A
Authority: CN
Inventors: 王懿; 王庆松; 李燕彬; 樊耀民; 梁子同; 岳琦; 王艳; 张希阳; 肖良; 韩红丽
Original assignee: China University of Petroleum Beijing
Current assignee: China University of Petroleum Beijing
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2022-03-22
Anticipated expiration: 2040-12-29
Also published as: CN112648436A

Abstract

The invention discloses a bundled submarine pipeline, which comprises: the device comprises a bearing pipe, a functional pipeline positioned in the bearing pipe, a spacing mechanism arranged between the functional pipeline and the bearing pipe, and a protective device and a limiting mechanism positioned outside the bearing pipe; the spacing mechanism can slide in a preset range relative to the pipe wall of the bearing pipe; stop gear sets up on bearing the tub outer wall, include: axial locating part and circumference locating part, protector includes: the protective sleeve is sleeved outside the bearing pipe, a clamping portion matched with the circumferential limiting piece is arranged on the protective sleeve, and the axial limiting piece is used for limiting the protective sleeve to axially move relative to the bearing pipe. The invention can reduce the influence of iceberg extrusion on the submarine pipeline.

Description

Bundling submarine pipeline

Technical Field

The invention relates to the technical field of ocean engineering equipment, in particular to a bunched submarine pipeline.

Background

The polar region contains rich oil and gas resources. However, due to the severe environmental conditions of the polar region, the design and installation of marine oil and gas pipelines need to additionally consider various factors. Among them, the iceberg extrusion causes unpredictable damage to the pipeline, which is one of the factors that must be considered. The iceberg extrusion means that when an iceberg in an arctic region moves to a shallow water region or approaches a shoreline, a keel portion of the iceberg below the sea level contacts the sea bed, and the iceberg moves by the action of wind and sea currents, thereby forming a trench in the sea bed.

The industry generally believes that: in order to prevent the influence caused by the extrusion of the iceberg, the pipeline can be buried in the soil to a certain depth, and the pipeline is not in direct contact with the iceberg. However, even in this case, the trenches formed by the extrusion of icebergs can cause severe deformation of the soil, which in turn drives the pipes to undergo large bending deformation and displacement in the horizontal direction.

Disclosure of Invention

In order to overcome the defects of the prior art, the technical problem to be solved by the embodiment of the invention is to provide a bundled submarine pipeline, which can reduce the influence of iceberg extrusion on the submarine pipeline.

The specific technical scheme of the embodiment of the invention is as follows:

a bundled subsea pipeline comprising: the device comprises a bearing pipe, a functional pipeline positioned in the bearing pipe, a spacing mechanism arranged between the functional pipeline and the bearing pipe, and a protective device and a limiting mechanism positioned outside the bearing pipe; the spacing mechanism can slide in a preset range relative to the pipe wall of the bearing pipe;

stop gear sets up on bearing the tub outer wall, include: an axial limiting piece and a circumferential limiting piece,

the guard device includes: the protective sleeve is sleeved outside the bearing pipe, a clamping portion matched with the circumferential limiting piece is arranged on the protective sleeve, and the axial limiting piece is used for limiting the protective sleeve to axially move relative to the bearing pipe.

In a preferred embodiment, the functional line comprises: production tube subassembly, gas lift pipe, water injection pipe subassembly.

In a preferred embodiment, the production tubular assembly comprises, in a radial direction: the production pipe comprises a production pipe body, a first heat insulation layer, a plurality of first centralizers and a first sleeve, wherein the production pipe body is located inside the production pipe body, the first heat insulation layer is located in the middle of the production pipe body, the first centralizers are located outside the first sleeve, the first heat insulation layer comprises a plurality of sections, the number of the first centralizers is multiple, and one first heat insulation layer is arranged between every two adjacent first centralizers.

In a preferred embodiment, the water injection pipe assembly includes, in a radial direction: the water injection pipe is positioned inside the water injection pipe, the second heat insulation layer is positioned in the middle of the water injection pipe, the second centralizer is positioned outside the water injection pipe, the second heat insulation layer comprises a plurality of sections, the number of the second centralizer is multiple, and one second heat insulation layer is arranged between every two adjacent second centralizers.

In a preferred embodiment, the spacing mechanism comprises: the device comprises a spacing plate, a sliding block which is connected with the spacing plate and is in sliding fit with the inner wall of the bearing pipe, and a roller which is connected with the spacing plate and is in rolling fit with the inner wall of the bearing pipe.

In a preferred embodiment, the spacing mechanism further comprises: first baffle, the space stop is the components of a whole that can function independently structure, the space stop includes: the gas lift pipe is clamped between the upper partition plate and the first baffle; the production pipe assembly is clamped between the middle partition plate and the upper partition plate; the water injection pipe assembly is clamped between the middle partition plate and the lower partition plate.

In a preferred embodiment, the sliding blocks are arranged on two sides of the upper spacing plate, and the sliding blocks are provided with cylindrical surfaces contacted with the bearing pipes; the idler wheels are installed on two sides of the middle partition plate and are rotary cylinders, and the generatrix of each idler wheel is an arc of the inner wall of the bearing pipe.

In a preferred embodiment, the circumferential limiting pieces are circumferential stoppers arranged on the outer wall of the bearing pipe, the axial limiting pieces are axial stoppers arranged at two ends of the bearing pipe, and the engaging portions are engaging slots engaged with the circumferential stoppers.

In a preferred embodiment, the protective sleeve has a streamlined outer shape.

In a preferred embodiment, the guard further comprises a fixed string, the fixed string comprising: the tubular pile, the seabed can be inserted to the one end of tubular pile, and the other end is provided with the clamp, the clamp with bear the union coupling.

The technical scheme of the invention has the following remarkable beneficial effects:

the application provides a submarine pipeline tied in a bundle, it includes: the device comprises a bearing pipe, a functional pipeline positioned in the bearing pipe, a spacing mechanism arranged between the functional pipeline and the bearing pipe, and a protective device and a limiting mechanism positioned outside the bearing pipe; the spacing mechanism can slide in a preset range relative to the pipe wall of the bearing pipe; stop gear sets up on bearing the tub outer wall, include: axial locating part and circumference locating part, protector includes: the protective sleeve is sleeved outside the bearing pipe, a clamping portion matched with the circumferential limiting piece is arranged on the protective sleeve, and the axial limiting piece is used for limiting the protective sleeve to axially move relative to the bearing pipe. Compared with the existing cluster pipeline system, the cluster pipeline system can reduce pipeline displacement caused by iceberg extrusion and change the stress distribution of the pipeline, thereby protecting the functional pipeline positioned in the bearing pipe, reducing the plastic strain of the pipeline and further reducing the influence of iceberg extrusion on the submarine pipeline.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not so limited in scope. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims. Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

Drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for facilitating the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. Those skilled in the art, having the benefit of the teachings of this invention, may choose from the various possible shapes and proportional sizes to implement the invention as a matter of case.

FIG. 1 is an isometric view of a polar region bundled subsea pipeline taking into account the impact of iceberg extrusion as provided in an embodiment of the present application;

FIG. 2 is a front view of a polar region bundling submarine pipeline considering iceberg squeezing effect according to the embodiment of the present application;

FIG. 3 is a front view of a device for removing a protection device of a polar region gathering submarine pipeline considering the influence of iceberg extrusion provided in the embodiment of the present application;

FIG. 4 is a top view of a polar region bundled subsea pipeline with consideration of iceberg squeezing effects with a detached fairing sleeve provided in an embodiment of the present application;

fig. 5 is a side view of a polar region bundling seabed pipeline with a production pipe sleeve, a water injection pipe sleeve, a streamline sleeve and a bearing pipe removed, wherein the influence of iceberg squeezing is considered.

Reference numerals of the above figures:

100. a carrier tube; 101. a circumferential stop block; 102. an axial stop; 200. a protective sleeve; 201. a card slot; 300. a functional pipeline; 310. a production tubing assembly; 301. producing a pipe; 302. a first thermal insulation layer; 303. a first centralizer; 304. a first sleeve; 320. a gas lift tube; 321. a first baffle plate; 330. a water injection pipe assembly; 331. a water injection pipe; 332. a second thermal insulation layer; 333. a second centralizer; 334. a second sleeve; 400. a spacing mechanism; 401. an upper partition plate; 402. a middle partition plate; 403. a lower partition plate; 501. a slider; 502. a roller; 600. fixing the pipe column; 601. clamping a hoop; 602. and (4) tube piles.

Detailed Description

The technical solutions of the present invention will be described in detail with reference to the accompanying drawings and specific embodiments, it should be understood that these embodiments are merely illustrative of the present invention and are not intended to limit the scope of the present invention, and various equivalent modifications of the present invention by those skilled in the art after reading the present invention fall within the scope of the appended claims.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The cluster pipeline can transport oil and gas resources in a centralized manner, has excellent heat preservation and corrosion resistance, can shorten the installation time to one season, thereby reducing the engineering cost and having obvious design advantages in polar regions. The bundling pipe can be divided into a closed type and an open type. The open type pipeline has a simpler structure, and only various pipelines and cables are simply bound together to form a bundling pipeline, so that the bundling pipeline is simpler to install and has low cost; but the protection function for the pipeline is poor, and the use requirement of the polar environment cannot be met. The closed type cluster submarine pipeline can complete production, debugging and assembly of the system on land, reduces offshore installation and construction time, can provide better heat preservation effect for production pipelines, can convey oil and gas products at higher temperature, is not directly exposed to the environment, and reduces the risk of environmental pollution after the pipeline is broken.

However, even the existing closed type cluster pipe cannot be directly applied to polar areas with iceberg extrusion. In general, no bundled submarine pipeline can meet the use requirement of polar environment with iceberg extrusion at present.

The invention provides a polar bundling submarine pipeline considering iceberg extrusion influence, aiming at the defects of the existing bundling pipeline and aiming at fully shortening the construction time and carrying out good external load resistance and heat preservation protection on the pipeline under the condition of considering iceberg extrusion.

Referring to fig. 1 to 5, in an embodiment of the present invention, a submarine pipeline bundle, specifically a polar region submarine pipeline bundle considering the influence of iceberg extrusion, mainly includes: an outer carrier tube 100, an inner functional line 300, a spacer, a guard and a stop.

The internal functional line 300 may include: a production tubing assembly 310, a gas lift tubing 320, and a water injection tubing assembly 330. In a specific application scenario, the number of the production tube assemblies 310 may be two, one production tube assembly 310 is an opposite high-pressure production tube assembly, and the other production tube assembly 310 is an opposite low-pressure production tube assembly.

As shown in fig. 3, the functional line 300 includes: two production tubing assemblies 310, a gas lift tubing 320, and a water injection tubing assembly 330. The production tube assembly 310 and the water injection tube assembly 330 are both tube-in-tube structures.

Wherein the production tubing assembly 310 comprises: an inner production pipe 301, an intermediate first thermal insulation layer 302, a first centralizer 303 and an outer first casing 304. The first thermal insulation layer 302 includes a plurality of segments, the number of the first centralizers 303 is multiple, and one first thermal insulation layer 302 is disposed between two adjacent first centralizers 303.

Specifically, the production pipe 301 is a hollow pipe structure, and can be divided into various pressure production pipes, such as a high pressure production pipe and a low pressure production pipe, according to the pressure of the fluid flowing through the inside. First thermal insulation layer 302 serves to insulate production pipe 301 to ensure that fluid in production pipe 301 flows smoothly. The first thermal insulation layer 302 may be made of a thermal insulation material, and may form a thermal insulation layer with a certain thickness.

The effect of first centralizer 303 is to be located inside production pipe 301 and to be placed in the middle in first sleeve 304 effectively, avoids production pipe 301 and first sleeve 304 inner wall direct contact and causes wearing and tearing to the heat preservation, makes the heat preservation obtain reducing at the length of production pipe 301's pipeline axis direction simultaneously, makes the heat preservation can install by a small section, to prevent the skew and the rotation of heat preservation. Specifically, the first centralizer 303 can include two semi-circular rings, which can be bolted together.

The water injection pipe assembly 330 includes in a radial direction: an inner water injection tube 331, an intermediate second thermal insulation layer 332, a second centralizer 333 and an outer second casing 334. The second heat insulating layer 332 includes a plurality of sections, the number of the second centralizers 333 is plural, and one second heat insulating layer 332 is disposed between two adjacent second centralizers 333.

Specifically, the water injection pipe 331 is a hollow pipe structure, and the fluid flowing through the inside of the pipe is water. The second heat insulating layer 332 serves to insulate the water injection pipe 331, thereby ensuring smooth flow of water in the water injection pipe 331. Similarly, the second thermal insulation layer 332 may be made of a thermal insulation material, and forms a thermal insulation layer with a certain thickness.

The effect of second centralizer 333 is to be located inside water injection pipe 331 and to be placed in the middle in second sleeve 334 effectively, avoids water injection pipe 331 and second sleeve 334 inner wall direct contact and causes wearing and tearing to the heat preservation, makes the heat preservation obtain reducing at the length of the pipeline axis direction of water injection pipe 331 simultaneously, makes the heat preservation can install by segment to prevent the skew and the rotation of heat preservation. In particular, the second centralizer 333 can include two semi-rings that can be connected by a bolting mechanism. This bolt mechanism includes: nuts, washers, and bolts.

A spacer mechanism is designed between the inner functional pipeline 300 and the outer carrier pipe 100, and the spacer mechanism 400 is used for supporting the inner functional pipeline 300 and ensuring that the relative position of the inner functional pipeline 300 is fixed.

In one embodiment, the spacing mechanism 400 may comprise: first baffle 321 is the space bar of components of a whole that can function independently structure, and the space bar includes: an upper partition plate 401, a middle partition plate 402 and a lower partition plate 403, wherein the gas lift pipe 320 is clamped between the upper partition plate 401 and the first baffle 321; the production tubular assembly 310 is snapped between the intermediate bulkhead 402 and the upper bulkhead 401; the water injection pipe assembly 330 is clamped between the intermediate partition 402 and the lower partition 403.

In this embodiment, the gas lift pipe 320 is located at the upper part of the partition plate, the first baffle 321 fixes the position of the gas lift pipe 320 with the upper part of the partition plate, and the first baffle 321 is connected with the upper part of the partition plate (i.e., the upper partition plate 401) through a bolt mechanism. This bolt mechanism includes: nuts, washers, and bolts.

In this embodiment, for easy installation and reliable positioning after reasonable layout of the internal functional pipelines 300, the partition plate is divided into three parts, namely an upper partition plate 401, a middle partition plate 402 and a lower partition plate 403 which are detachably connected. Specifically, the upper partition plate 401 is connected to the middle partition plate 402 by a bolt mechanism, and the middle partition plate 402 is connected to the lower partition plate 403 by a bolt mechanism.

In one embodiment, the sliding blocks 501 and the rollers 502 are in contact between the partition plate and the external bearing pipe 100, so that a certain degree of freedom of movement can be provided along the inner wall of the bearing pipe 100, when the bundled submarine pipeline is extruded in icebergs, the stress state of the pipeline can be changed through automatic adjustment of the internal functional pipeline 300, the internal stress distribution tends to be uniform, and large bending deformation in the horizontal direction is prevented.

In this embodiment, spacers are attached to both sides of the upper partition 401. The shape of the spacer block can be close to a cuboid, and the contact surface of the spacer block and the bearing pipe 100 is a cylindrical surface, so that the friction force when the spacer block and the bearing pipe are in contact is reduced as much as possible. The spacer block and the upper spacer plate 401 may be connected by a bolt mechanism. Of course, the two can be connected by other connection methods.

In this embodiment, rollers 502 are attached to both sides of the intermediate partition 402. The roller 502 is in the shape of a rotating cylinder, the generatrix of the roller 502 is the arc of the inner wall of the bearing tube 100, and the roller 502 is in rolling fit with the inner wall of the bearing tube 100, so that the friction force between the roller 502 and the inner wall of the bearing tube 100 is greatly reduced. The roller 502 and the lower partition plate 403 may be connected by a bolt mechanism. Of course, the two can be connected by other connection methods.

In this embodiment, except for the contact between the spacers and the rollers 502 and the outer carrier tube 100, the other parts of the spacer plates do not contact the inner wall of the carrier tube 100, so as to ensure the automatic adjustment of the internal functional pipeline 300 when the bundled submarine pipeline is extruded in icebergs, optimize the internal stress distribution, and avoid stress concentration.

In this embodiment, a certain space is provided on the top of the partition plate in order to place the control cable.

Referring to fig. 1 and fig. 2, in the present embodiment, the protection device may include: and the protective sleeve 200 is sleeved outside the bearing pipe 100. The protection sleeve 200 is provided with a clamping portion matched with the circumferential limiting member, and the axial limiting member is used for limiting the protection sleeve 200 to axially move relative to the bearing tube 100.

Specifically, the protection sleeve 200 comprises a protection sleeve 200 with a streamlined external shape, and specifically, the external surface of the protection sleeve 200 is a smooth and regular surface without large undulations and sharp corners, and after the protection sleeve 200 is disposed in a streamlined shape, the fluid (mixture of water and soil) mainly shows a laminar flow on the surface of the streamlined object, and there is no or little turbulence, which ensures that the protection sleeve 200 is subjected to a small resistance. The inventor verifies through comparative analysis that: the streamline protective sleeve 200 is mounted on the outer bearing pipe 100, so that the radial force caused by soil movement due to iceberg extrusion on the pipeline can be relieved, and the stress distribution on the pipeline is optimized. On the other hand, by arranging the protective sleeve 200 outside the bearing pipe 100, when the bundled submarine pipeline is squeezed by the iceberg, the iceberg squeezed soil can be quickly guided away from the bundled submarine pipeline to resist bending and displacement of the pipeline under the action of soil deformation, so that the influence of the iceberg squeezing on the bundled submarine pipeline is reduced as much as possible.

Specifically, the outer contour of the cross-section of the protection sleeve 200 may be, but is not limited to, an oval shape, such as an ellipse-like shape, or other outer contour shapes.

Referring to fig. 4, in addition, the protection sleeve 200 with streamline shape can limit the degree of freedom by a limiting mechanism. Specifically, this stop gear sets up on bearing pipe 100 outer wall, includes: axial locating part and circumference locating part. Specifically, the circumferential limiting part is an annular stopper 101 disposed on the outer wall of the carrier tube 100, the axial limiting parts are axial stoppers 102 disposed at two ends of the carrier tube 100, and the engaging portion is a engaging groove 201 engaged with the annular stopper 101. When the circumferential stopper 101 and the radial stopper are matched with the slot 201, they can be used to limit the circumferential and axial movements of the streamlined protective sleeve 200.

In particular, during installation, a circumferential stop 101 may be welded to the carrier pipe 100 to limit circumferential movement of the liner sleeve on the carrier pipe 100. After the position of the streamlined sleeve on the carrier tube 100 is determined, axial stops 102 are welded to both ends of the carrier tube 100 to limit axial movement of the streamlined sleeve on the carrier tube 100.

Referring to fig. 5, in one embodiment, the protection device further includes a fixed string 600. The fixed string 600 includes: the pipe pile 602, one end of pipe pile 602 can insert the seabed, and the other end is provided with clamp 601, and clamp 601 is connected with carrier tube 100.

Specifically, the tube stake 602 includes a semi-cylindrical support structure. The clip 601, the tube stake 602, and the carrier tube 100 may be connected by a bolt mechanism. Wherein, this bolt mechanism can include: bolts, washers, and nuts. The fixed pipe string 600 fixes the pipe using a pile anchoring technique to resist bending and displacement of the pipe under the action of soil deformation.

In order to fully explain the outstanding technical effects produced by the bundled submarine pipelines provided by the present application, the following inventors have conducted comparative analysis on the bundled submarine pipelines provided with the protective devices provided in the present specification and the existing bundled pipeline systems without the protective devices in many aspects.

First, displacement analysis

The designed pipeline protection device can actually reduce pipeline displacement caused by iceberg extrusion, especially for the gas lift pipe 320 with the maximum displacement. Table 1 below summarizes the maximum displacement for each pipe.

TABLE 1 maximum displacement table for pipeline

Second, stress analysis

The stress section mainly looks at the point of maximum stress. For bundled tube systems without a shield, the maximum stress is on the gas lift tube 320.

For a jacketed subsea pipeline, the maximum stress is on the outer carrier pipe 100.

It can be seen that by providing a protective device, the stress distribution of the pipeline can be changed, thereby protecting the functional pipeline 300 located within the carrier pipe 100.

Third, plastic strain analysis

For a bundled tube system without a guard, the maximum equivalent plastic strain produced by the gas lift tube 320 was 0.033 at the spacer plate.

For a sheltered bundled subsea pipeline, the maximum equivalent plastic strain is 0.028, on the outer carrier pipe 100.

It follows that the protector can reduce the plastic strain of the pipe to some extent.

It should be noted that, in the description of the present application, the terms "first", "second", and the like are used for descriptive purposes only and for distinguishing similar objects, and no precedence between the two is intended or should be construed to indicate or imply relative importance. In addition, in the description of the present application, "a plurality" means two or more unless otherwise specified.

The above embodiments in the present specification are all described in a progressive manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment is described with emphasis on being different from other embodiments.

The above embodiments are only a few embodiments of the present invention, and the embodiments of the present invention are described above, but the present invention is only used for the understanding of the present invention, and is not limited to the embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A bundled subsea conduit, comprising: the device comprises a bearing pipe, a functional pipeline positioned in the bearing pipe, a spacing mechanism arranged between the functional pipeline and the bearing pipe, and a protective device and a limiting mechanism positioned outside the bearing pipe; the spacing mechanism can slide in a preset range relative to the pipe wall of the bearing pipe;

stop gear sets up on bearing the tub outer wall, include: an axial limit piece and a circumferential limit piece;

the guard device includes: the protective sleeve is sleeved outside the bearing pipe, a clamping part matched with the circumferential limiting part is arranged on the protective sleeve, and the axial limiting part is used for limiting the protective sleeve to axially move relative to the bearing pipe;

the functional pipeline includes: the production pipe assembly, the gas lift pipe and the water injection pipe assembly;

the production tubular assembly comprises in a radial direction: the production pipe comprises a production pipe body, a first heat insulation layer, a plurality of first centralizers and a first sleeve, wherein the production pipe body is positioned inside the production pipe body, the first heat insulation layer is positioned in the middle of the production pipe body, the first centralizers are positioned outside the first sleeve, and one first heat insulation layer is arranged between every two adjacent first centralizers;

the water injection pipe assembly includes in a radial direction: the water injection pipe is positioned inside the water injection pipe, the second heat insulation layer is positioned in the middle of the water injection pipe, the second centralizers are positioned in the middle of the water injection pipe, the second sleeve is positioned outside the water injection pipe, the second heat insulation layer comprises a plurality of sections, the number of the second centralizers is multiple, and one second heat insulation layer is arranged between every two adjacent second centralizers;

the external shape of the protective sleeve is streamline.

2. The bundled subsea conduit of claim 1, wherein said spacing mechanism comprises: the device comprises a spacing plate, a sliding block which is connected with the spacing plate and is in sliding fit with the inner wall of the bearing pipe, and a roller which is connected with the spacing plate and is in rolling fit with the inner wall of the bearing pipe.

3. The bundled subsea conduit of claim 2, wherein said spacing mechanism further comprises: first baffle, the space stop is the components of a whole that can function independently structure, the space stop includes: an upper partition plate, a middle partition plate and a lower partition plate,

the gas lift pipe is clamped between the upper partition plate and the first baffle plate;

the production pipe assembly is clamped between the middle partition plate and the upper partition plate;

the water injection pipe assembly is clamped between the middle partition plate and the lower partition plate.

4. The bundled subsea pipeline of claim 3, where said blocks are mounted on both sides of said upper spacer plate, said blocks having cylindrical surfaces in contact with said carrier pipe; the idler wheels are installed on two sides of the middle partition plate and are rotary cylinders, and the generatrix of each idler wheel is an arc of the inner wall of the bearing pipe.

5. The bundled submarine pipeline according to claim 1, wherein the circumferential stoppers are circumferential stoppers provided on the outer wall of the carrier pipe, the axial stoppers are axial stoppers provided at both ends of the carrier pipe, and the engaging portions are engaging grooves engaged with the circumferential stoppers.

6. The bundled subsea conduit of any of claims 1-4, wherein the shield apparatus further comprises a stationary tubing string, the stationary tubing string comprising: the tubular pile, the seabed can be inserted to the one end of tubular pile, and the other end is provided with the clamp, the clamp with bear the union coupling.