CN115355370A

CN115355370A - Large-diameter high-pressure-bearing marine oil delivery hose

Info

Publication number: CN115355370A
Application number: CN202211071102.3A
Authority: CN
Inventors: 王浩; 吴智深; 汪昕; 蒋丽娟; 陈兴芬; 李翠梅; 田雨
Original assignee: China Water Resources And Environment Research Institute Suzhou Co ltd; Hengshui Ruixian New Material Technology Co ltd
Current assignee: China Water Resources And Environment Research Institute Suzhou Co ltd; Hengshui Ruixian New Material Technology Co ltd
Priority date: 2022-09-02
Filing date: 2022-09-02
Publication date: 2022-11-18

Abstract

The invention discloses a marine oil hose, which sequentially comprises a thermoplastic inner pipe, an externally wound prepreg tape, a braided sleeve and an outer coating from inside to outside, wherein all layers are in a bonding state. Compared with the prior art, the marine oil delivery hose prepared by the method is convenient for laying complex topography and landform on the seabed; the pipeline can be coiled under the non-working state, is convenient for storage and transportation, and the working state of the pipeline is recovered by heating and pressurizing during working, and the pipeline is coiled again by vacuumizing during recovery, so that the pipeline can be used for multiple times. The pipeline has good mechanical property, the diameter of the pipeline can reach 400-1000mm, the pipeline can bear the internal pressure of 55MPa for a long time, and the instantaneous pressure is 100MPa; the pipeline has good machinability, can be continuously produced, has few interfaces, has the length of a single pipe of more than 1 kilometer, and can be prefabricated in a factory or processed on site. All the materials of each layer of the hose have good chemical corrosion resistance, and can be used for a long time on the seabed.

Description

Large-diameter high-pressure-bearing marine oil delivery hose

Technical Field

The invention belongs to the technical field of marine oil delivery hoses, and particularly relates to a large-diameter high-pressure-bearing marine oil delivery hose.

Background

The marine pipeline is classified into two types, namely a steel pipe and a hose according to material classification, wherein the hose is formed by compounding metal and polymer. Compared with a steel pipe, the hose has the characteristics of being easy to bend, easy to lay, recyclable, more economical, more suitable for marine environment and the like. Therefore, the hose has gradually begun to be applied in the field of marine risers and marginal oil fields in China, such as the floating 11-1 and Lufeng 13-1 oil fields. In foreign countries, the flexible pipe line has been widely applied to land, shallow water, deep water and ultra-deep water areas, and can realize long-distance, ultra-deep water and multi-directional oil and gas resource transmission. The marine riser is now about 85% flexible pipe.

The existing hose is generally made of multilayer composite materials and mainly comprises a thermoplastic polymer material layer for ensuring liquid tightness and flat steel wound in a spiral structure for ensuring the strength of the hose. The thermoplastic polymer material layer not only has good tightness, but also has good corrosion resistance; the spiral structure enables the hose to bear high pressure and maintain bending characteristics, each layer is relatively independent and interacts with other layers to provide required structural resistance, so that each hose can achieve different mechanical characteristics, and the hose is concerned by scholars at home and abroad and engineering circles.

But the hose is stillHowever, there are problems, on the one hand, that the diameter and pressure-bearing capacity of the pipe still do not meet the requirements of use. At present, the inner diameter of the produced hose is 7 inches, and the working pressure reaches 34.5MPa; but when the inner diameter is 15 inches, the working pressure is only 5MPa. The French Technip company produces the hose with the maximum pressure bearing of 120MPa when the inner diameter is 6 inches, and the maximum pressure bearing of 72MPa when the inner diameter is 10 inches; the U.S. Magma corporation produces hoses having a diameter of 2-6 inches and a maximum pressure of 138MPa. Higher use requirements are difficult to meet only by changing material properties, and the structure must be innovated; on the other hand, when used as marine pipelines, are affected by their internal transport media, e.g. CO ₂ 、H ₂ And the metal structure in the hose is easy to corrode due to the fact that the content of S and the like greatly exceeds a design value in the production process, and the service life of the hose is shortened. Therefore, a large-diameter, high-pressure-bearing and corrosion-resistant hose for undersea oil transportation is needed.

Disclosure of Invention

The purpose of the invention is as follows: aiming at the defects of the prior art, the invention provides a large-diameter high-pressure-bearing marine oil delivery hose, which adopts green and environment-friendly fibers and thermoplastic resin as main materials of the hose, realizes the high-temperature inflation work and low-temperature coiling recovery of a pipeline, and has good convenience; and the prepared pipeline has large diameter and high mechanical property.

The technical scheme is as follows: in order to achieve the purpose, the invention adopts the following technical scheme:

the marine oil hose sequentially comprises a thermoplastic inner pipe, an externally wound prepreg tape, a braided sleeve and an outer coating from inside to outside.

As preferred or specific embodiments:

the thermoplastic inner pipe is a thermoplastic plastic pipe made of high-density polyethylene (HDPE), polypropylene (PP), nylon PA (polyamide), polyvinylidene fluoride (PVDF), polyphenylene sulfide (PPS) and polyether ether ketone (PEEK) materials, has good sealing property and corrosion resistance, and is a main structure supporting layer; the thermoplastic pipe can be formed secondarily at high temperature, can be coiled at ordinary times, and is convenient to transport; when in work, the pipe is pressed at high temperature to form a pipe; after use the coil is compressed by negative pressure.

The outer winding prepreg tape is a thermoplastic prepreg tape reinforced by basalt fibers or reinforced by mixing basalt fibers with other fibers, the thermoplastic is selected from high-density polyethylene (HDPE), polypropylene (PP), nylon (PA), polyvinylidene fluoride (PVDF), polyphenylene sulfide (PPS) or polyether ether ketone (PEEK) materials, and the material of the thermoplastic prepreg tape is the same as that of the inner thermoplastic pipe. The basalt fiber has high strength, is green and environment-friendly, and has good corrosion resistance; thermoplastics generally have good corrosion resistance.

Further preferably, the other fibers are selected from one or more of aramid fibers, carbon fibers or glass fibers.

The winding angle of the externally wound prepreg tape is not less than 45 degrees with the axial direction of the thermoplastic inner pipe.

The braided sleeve is made of basalt fibers or a mixed braided sleeve made of basalt fibers and other fibers. The braided sleeve has the functions of providing axial strength and restraining the deformation of the pipeline in the process of laying and recovering the pipeline; among them, basalt fiber provides strength, and other fibers satisfy special requirements.

The outer layer is coated by polyether ether ketone (PEEK) or polyurethane materials, when the braided tube is used, thermoplastic resin and an auxiliary agent are mixed in an acetone solution, the mixture is coated on the surface of the braided tube, and the braided tube is heated and dried to form a whole.

And a release agent is coated on the inner wall of the thermoplastic inner pipe.

Has the beneficial effects that: compared with the prior art, the marine oil hose prepared by the invention has the following characteristics: the invention consists of a total of 3 main structures. The inner-layer HDPE pipe is a thermoplastic pipe, has the advantages of low price, light weight, good durability, secondary forming and the like, and is successfully applied to novel marine hoses. However, because the mechanical properties of thermoplastic resins such as HDPE are low, the existing hose is mostly made of composite materials reinforced by continuous fibers. However, in the process of contacting oil and gas, the sealing performance of the composite material is relatively poor, and particularly, pores in the fiber and the matrix are often key parts corroded by corrosive substances in the oil and gas. Therefore, the invention selects pure thermoplastic resin with good sealing performance as the inner pipe, and the fiber reinforced thermoplastic prepreg is wound around the outside of the inner pipe in an annular mode. The prepreg tape provides high hoop restraint on the one hand, and on the other hand, prepreg and inner tube are the same base member, and prepreg and inner tube have good adhesive property when heating, can guarantee the synergism of inner tube and prepreg tape. The prepreg layer is a fiber braided sleeve, plays two roles and provides axial strength respectively; the deformation of the pipeline is restrained in the process of laying and recovering the pipeline. Because the fibre is easily damaged by machinery, and the resistant sea water corrosion resistance of some fibre is not feasible, consequently, the fiber sleeve has outer resin coating, and the effect is: the fiber is protected from external mechanical damage and corrosion damage; so that the braided sleeve and the prepreg tape are bonded into a whole. Considering the feasibility of secondary molding of the hose at high temperature, the oil-coating release agent is closed in HDPE, so that the inner surface is not adhered after high-temperature deformation. This hose has realized the dual innovation to current ocean oil transportation hose structure and material, has following advantage: the laying of complex topography and landform at the seabed is facilitated; the pipeline can be coiled under the non-working state, is convenient for storage and transportation, can be restored to the working state through heating and pressurizing during working, and can be coiled again through vacuumizing during recovery, so that the pipeline can be used for multiple times. The pipeline has good mechanical property, the diameter of the pipeline can reach 400-1000mm, the pipeline can bear the internal pressure of 55MPa for a long time, and the pipeline can bear the pressure of 100MPa instantly; the pipeline has good machinability, can be continuously produced, has few interfaces, has the length of a single pipe of more than 1 kilometer, and can be prefabricated in a factory or processed on site. All the materials of each layer of the hose have good chemical corrosion resistance, and can be used for a long time on the seabed.

Drawings

FIG. 1 is a schematic structural view of the marine oil hose of the present invention;

FIG. 2 is a diagram of the state of the thermoplastic inner tube in the marine oil hose according to the present invention under three operating conditions;

Detailed Description

The following is a general description of the embodiments of the present invention, which are the most preferred embodiments of the present invention, but the present invention is not limited to the following examples.

Example 1

A marine oil delivery hose is shown in figure 1 and sequentially comprises a thermoplastic inner pipe, an externally wound prepreg tape, a braided sleeve and an outer coating from inside to outside.

The thermoplastic inner pipe is a thermoplastic pipe made of high-density polyethylene HDPE material, has good sealing property and corrosion resistance, and is a main structure supporting layer; the thermoplastic plastic pipe can be molded at high temperature for two times, and can be coiled at ordinary times, so that the transportation is convenient; when in work, the pipe is pressed at high temperature to form a pipe; after use, the coil is compressed by negative pressure. The inner wall of the thermoplastic inner tube is coated with a release agent, so that the problem that the inner walls of the thermoplastic inner tubes are stuck together and cannot be separated after being recycled is avoided.

The externally-wound prepreg tape is a basalt fiber reinforced HDPE prepreg tape (reinforced by adopting a conventional method in the prior art) with the same mark as that of the thermoplastic inner tube, wherein the fiber volume fraction is 60%, the total thickness of the prepreg tape is 25mm, and the basalt fiber is high in strength, green, environment-friendly and good in corrosion resistance; thermoplastics generally have good corrosion resistance.

The braided sleeve is made of basalt fiber. The braided sleeve has the functions of providing axial strength and restraining the deformation of the pipeline in the process of laying and recovering the pipeline; among other things, basalt fibers provide strength.

The outer layer is coated by a polyether-ether-ketone material, the polyether-ether-ketone and an auxiliary agent are mixed in an acetone solution when the braided sleeve is used, the mixture is coated on the surface of the braided sleeve, and the braided sleeve is heated and dried to form a whole.

The thermoplastic inner tube is prepared by adopting an extrusion process. The prepreg tape is prepared by adopting a pultrusion process. The whole hose preparation process is as follows: step 1: extruding a pipeline; and a step 2: winding a prepreg tape; step 3: heating (slightly melting the inner thermoplastic tube and the outer winding prepreg tape to make the inner thermoplastic tube and the outer winding prepreg tape more fit with each other); and step 4: weaving the sleeve; step 5: and (4) coating.

Testing the performance of the pipeline:

according to the standard DNV-OS-F101 subsidiary Pipinene System, a 206DP Shenzhen universal testing machine for measuring hydraulic pressure is adopted for testing, when the diameter of a pipeline is 400mm, the safety coefficient is 1.5, and the normal pressure can be borne by 100MPa.

Example 2

The thermoplastic inner pipe is a thermoplastic pipe made of high-density polyethylene HDPE material, has good sealing property and corrosion resistance, and is a main structure supporting layer; the thermoplastic pipe can be formed secondarily at high temperature, can be coiled at ordinary times, and is convenient to transport; when in work, the pipe is pressed at high temperature to form a pipe; after use, the coil is compressed by negative pressure. The inner wall of the thermoplastic inner tube is coated with a release agent, so that the problem that the inner walls of the thermoplastic inner tubes are stuck together and cannot be separated after being recycled is avoided.

The externally-wound prepreg tape is an HDPE prepreg tape (reinforced by adopting a conventional method in the prior art) with the same mark as that of the thermoplastic inner tube, and is reinforced by basalt fibers and carbon fibers, wherein the volume ratio of the basalt fibers to the carbon fibers is 1, the total volume fraction of the fibers is 60%, the total thickness of the prepreg tape is 30mm, the strength of the basalt fibers is high, and the externally-wound prepreg tape is green and environment-friendly and has good corrosion resistance; thermoplastics generally have good corrosion resistance.

The braided sleeve is formed by mixing basalt fibers and carbon fibers. The braided sleeve has the functions of providing axial strength and restraining the deformation of the pipeline in the process of laying and recovering the pipeline; wherein, the basalt fiber provides strength, and the carbon fiber improves the bearing capacity.

The outer layer is coated with a polyurethane material, the polyurethane and the auxiliary agent are mixed in an acetone solution when the braided sleeve is used, the mixture is coated on the surface of the braided sleeve, and the braided sleeve is heated and dried to form a whole.

The thermoplastic inner tube is prepared by adopting an extrusion process, and the prepreg tape is prepared by adopting a pultrusion process. The whole hose preparation process is as follows: step 1: extruding a pipeline; and a step 2: winding the prepreg tape; step 3: heating; and step 4: weaving the sleeve; step 5: and (4) coating.

Testing the performance of the pipeline:

according to the standard DNV-OS-F101 subsidiary Pipinene System, a 206DP Shenzhen universal hydraulic universal testing machine is adopted for testing, when the diameter of a pipeline is 800mm, the safety coefficient is 1.5, and the transient pressure can be borne by 100MPa.

While the invention has been described with reference to a preferred embodiment, 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.

Claims

1. The marine oil delivery hose is characterized by comprising a thermoplastic inner pipe, an externally wound prepreg tape, a braided sleeve and an outer coating in sequence from inside to outside.

2. The marine oil hose of claim 1, wherein the thermoplastic inner tube is a thermoplastic tube made of a material selected from the group consisting of HDPE, PP, PA, PVDF, PPS, and PEEK.

3. The marine oil hose of claim 1, wherein the outer winding prepreg tape is a thermoplastic prepreg tape reinforced with basalt fibers or basalt fibers mixed with other fibers, the thermoplastic is selected from High Density Polyethylene (HDPE), polypropylene (PP), nylon (PA), polyvinylidene fluoride (PVDF), polyphenylene sulfide (PPS) or polyether ether ketone (PEEK) materials, and is made of the same material as the thermoplastic inner pipe.

4. The marine oil hose according to claim 3, wherein the other fibers are selected from one or more of aramid fibers, carbon fibers or glass fibers.

5. The marine oil hose of claim 1, wherein the wrap angle of the outer wrap prepreg tape is not less than 45 ° from the inner thermoplastic tube axis.

6. The marine oil hose of claim 1, wherein the braided sleeve is a basalt fiber or a hybrid braided sleeve of basalt fiber and other fibers.

7. The marine oil hose according to claim 6, wherein the other fibers are selected from one or more of aramid fibers, carbon fibers or glass fibers.

8. The marine oil hose of claim 1, wherein the outer coating is a Polyetheretherketone (PEEK) or polyurethane material.

9. The marine oil hose of claim 3, wherein the inner thermoplastic tube wall is coated with a release agent.