CN104373705A - Deep sea oil transportation composite pipeline - Google Patents

Abstract

The invention provides a deep-sea oil transportation composite pipeline, which includes a rigid inner pipe, a rigid outer pipe, an insulating layer filled between the rigid inner pipe and the rigid outer pipe, and an anti-corrosion layer coated on the rigid outer pipe. An inner tube peg is fixed on the outer wall of the rigid inner tube, and an outer tube peg is fixed on the inner wall of the rigid outer tube. The rigid inner tube and the rigid outer tube are concentric. The arrangement is evenly arranged at intervals along the axial direction of the steel pipe, and the insulation layer is a foam concrete layer. The invention has the advantages of excellent thermal insulation performance, good overall working performance and high stable bearing capacity.

Description

A composite pipeline for deep sea oil transportation

Technical field

The invention relates to a marine engineering structure system, more specifically, to a deep-sea oil pipeline.

Background technique

With the expanding scope of offshore oil and gas exploitation and the depletion of onshore and shallow sea oil and gas resources, deep sea oil and gas development has become the focus and frontier of the oil industry. Deep-sea submarine oil pipelines usually have a long distance, and the thermal insulation performance requirements of submarine pipelines are relatively strict. Moreover, the service environment of deep-sea submarine oil pipelines is relatively harsh, and higher requirements are placed on the structural performance of submarine pipelines.

The traditional single-layer pipeline has poor thermal insulation performance and is difficult to meet the thermal insulation requirements. Therefore, the deep-sea submarine oil pipeline must adopt a multi-layer pipeline system with good thermal insulation performance. As the most commonly used multi-layer pipeline system, the tube-in-pipe pipeline is composed of a rigid outer tube, an inner tube, and a centering device. Insulation materials (foam, aerogel, etc.) are added to the annular space formed by the inner and outer tubes. With the application in engineering, the pipe-in-pipe has also exposed some of its own shortcomings, mainly in the following two aspects:

1. The inner and outer pipes of the pipe-in-pipe pipeline cannot coordinate deformation in the axial direction, and can only coordinate deformation in the radial direction at the centering device. The transfer efficiency of the load between the inner and outer pipes is low, and the overall performance of the pipeline is poor; In order to resist the high water pressure outside the pipeline and the high oil pressure and high temperature inside the pipeline, the inner and outer pipes often need a larger wall thickness, resulting in an increase in steel consumption.

2. The insulation material of the pipe-in-pipe pipe lacks structural performance, and the bond with the rigid inner pipe and outer pipe is weak, so the rigid inner pipe, outer pipe and insulation layer cannot be stressed as a whole, resulting in a stable bearing capacity of the structure lower.

Contents of the invention

In order to overcome the above technical deficiencies of existing deep-sea oil pipelines, the present invention provides a new deep-sea oil pipeline composite structure with excellent thermal insulation performance, good overall work performance and high stable bearing capacity.

To achieve the above object, the present invention adopts the following technical solutions:

A deep-sea oil transportation composite pipeline, comprising a rigid inner pipe, a rigid outer pipe, an insulation layer filled between the rigid inner pipe and the rigid outer pipe, and an anti-corrosion layer coated on the rigid outer pipe, characterized in that the rigid inner pipe The outer wall is fixed with inner pipe pegs, and the inner wall of the rigid outer pipe is fixed with outer pipe pegs. The rigid inner pipe and the rigid outer pipe are concentric. The steel pipes are evenly arranged at intervals in the axial direction, and the insulation layer is a foam concrete layer.

As a preferred embodiment, the inner pipe studs and the outer pipe studs are alternately arranged, and the foamed concrete layer is a polystyrene foamed concrete layer.

As shown in Figures 1 and 2, the new deep-sea oil transportation composite pipeline structure of this embodiment includes a rigid inner pipe 1, a rigid outer pipe 2, an inner pipe stud 3, an outer pipe stud 4, an insulation layer 5 and an anti-corrosion layer 6 , the rigid inner tube 1 is made of a round steel pipe, and the outer tube stud 3 is welded on the outside; the rigid outer tube 2 is made of a round steel tube, and the outer tube stud 4 is welded inside; The polystyrene foam (EPS) concrete between them is made of, and the anticorrosion layer 6 is coated on the outside of the rigid outer pipe 2.

The beneficial effects of the present invention are mainly manifested in the following two aspects:

1. The polystyrene foam (EPS) concrete used as the insulation layer not only has good thermal insulation and heat insulation performance, but also has good structural performance, which increases the bending stiffness of the submarine pipeline and improves the internal and external load. The transmission efficiency between the pipes makes the rigid inner pipe and outer pipe work together as a whole, thereby improving the pressure bearing capacity and bending bearing capacity of the submarine pipeline.

2. The studs welded on the outside of the rigid inner tube and the inside of the rigid outer tube can increase the bonding between the polystyrene foam (EPS) concrete insulation layer and the rigid inner tube and outer tube, and can ensure that the insulation layer is compatible with the rigid inner tube and outer tube. Cooperate with force and deformation, so as to improve the stable bearing capacity of the submarine pipeline.

Description of drawings

In order to illustrate the implementation technical scheme of the patent of the present invention more clearly, the accompanying drawings that will be used in the embodiments are described below. Obviously, the following drawings are only some implementations of the patent of the present invention. For those of ordinary skill in the art , on the premise of not paying creative labor, other implementation schemes can also be developed according to these drawings.

Fig. 1 is a longitudinal sectional view of the structural system of the present invention;

Fig. 2 is a cross section 1-1 diagram of the structural system of the present invention.

In the figure, 1: rigid inner tube, 2: rigid outer tube, 3: inner tube stud, 4: outer tube stud, 5: insulation layer,

6: Anti-corrosion layer.

Detailed ways

The following will clearly and completely describe the implementation technical solutions of the patent of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the patent of the present invention, not all of them. Based on the embodiments in the patent of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making innovative efforts belong to the protection scope of the patent of the present invention.

As shown in Figures 1 and 2, the new deep-sea oil transportation composite pipeline structure of this embodiment includes a rigid inner tube 1, a rigid outer tube 2, an inner tube stud 3, an outer tube stud 4, an insulation layer 5 and an anti-corrosion layer 6 , the rigid inner tube 1 is made of a round steel pipe, and the outer tube stud 3 is welded on the outside; the rigid outer tube 2 is made of a round steel tube, and the outer tube stud 4 is welded inside; The polystyrene foam (EPS) concrete between them is made of, and the anticorrosion layer 6 is coated on the outside of the rigid outer pipe 2.

The prefabrication method of the present invention is as follows:

(1) Weld the inner pipe pegs 3 outside the rigid inner pipe 1, and arrange 10 to 12 bolts evenly along the circumferential direction, and evenly arrange them at an interval of 200mm along the axial direction;

(2) Weld the outer tube stud 4 inside the rigid outer tube 2 to ensure that the diameter difference between the rigid inner tube 1 and the rigid outer tube 2 is 200mm, and the arrangement of the outer tube stud 4 is the same as that of the inner tube stud 3 in (1), Coating an anti-corrosion layer 6 with a thickness of about 3 mm on the outside of the rigid outer tube 2;

(3) Put the rigid inner tube 1 welded with the inner tube stud 3 into the rigid outer tube 2 welded with the outer tube stud 4 to ensure that the rigid inner tube 1 and the rigid outer tube 2 are concentric, and the inner tube stud 3 and the studs 4 of the outer tube are alternately placed;

(4) Pouring polystyrene foam (EPS) concrete in the annular space formed by the rigid inner pipe 1 and the rigid outer pipe 2, vibrating and compacting it, and curing it to a specified age, thereby making the novel deep-sea oil transportation composite pipeline structure of the present invention.

Claims (3)

1. A deep-sea oil transportation composite pipeline, comprising a rigid inner pipe, a rigid outer pipe, an insulating layer filled between the rigid inner pipe and the rigid outer pipe and an anticorrosion layer coated on the rigid outer pipe, characterized in that, An inner tube peg is fixed on the outer wall of the inner tube, and an outer tube peg is fixed on the inner wall of the rigid outer tube, and the rigid inner tube and the rigid outer tube are concentric. The inner pipe studs and outer pipe studs are uniformly arranged along the steel pipe ring direction, and evenly arranged at intervals along the steel pipe axial direction; the heat insulation layer is a foam concrete layer. 2. The composite pipe according to claim 1, characterized in that the inner pipe studs and the outer pipe studs are alternately arranged. 3. The composite pipeline according to claim 1, characterized in that, the foamed concrete layer is a polystyrene foamed concrete layer.