Composite pipeline with active heating and passive heat preservation functions and preparation method

Abstract

The invention discloses a composite pipeline with both active heating and passive heat preservation and a preparation method. The composite pipeline comprises an active heating pipeline and a passive heat preservation device wrapping the active heating pipeline. The passive warm-keeping device is composed of a warm-keeping cover anti-corrosion outer skin, a warm-keeping cover inner core and a warm-keeping cover anti-corrosion inner skin which are sequentially arranged from outside to inside, and the ends of the outer skin, the inner core and the inner skin are sewn together. The active heating pipeline is composed of a pipeline wear-resistant outer skin, a pipeline heating part and a pipeline body which are sequentially arranged from outside to inside, and a gap is reserved between the pipeline wear-resistant outer skin and the pipeline heating part. The composite pipeline has the advantages that on one hand, heat is provided for a medium in the composite pipeline in a low-voltage active heating mode, on the other hand, heat loss is reduced in a passive heat preservation mode, then the fluid state of the transmission medium in the composite pipeline in the low-temperature environment is better maintained, and the oil product transmission or emergency rescue efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of crude oil transportation equipment in oilfield areas, and in particular relates to a composite pipeline with both active heating and passive heat preservation and a preparation method thereof. Background Art

[0002] Different transmission media are often involved in the process of oil product collection or emergency rescue in oil fields. Since the lowest temperature of many oil fields in my country is below 0℃ or even -20℃, it is difficult to transport oil products in low temperature environments. For oil product transmission, although there are currently designs for oil and gas separation, heavy oil products with higher freezing points are transmitted, and light oil and gas with lower freezing points are refined, there are still various oil product transmission problems in low temperature environments in reality. At the same time, in the process of emergency rescue, the problem of freezing of water for fire fighting in low temperature environments is often encountered, which is very common in cold areas. The common treatment method for this is to keep the water flowing at a high or low speed during the fire fighting and rescue process until the fire fighting and rescue are completed. However, the pipeline at this time is often not convenient for storage due to the rapid freezing of residual water. In view of the above problems, a composite pipeline with both active heating and passive warming is invented, so as to better maintain the flow state of the transmission medium in the pipeline in a low temperature environment. This is very necessary for storage, transportation, transmission and fire fighting and rescue in the low temperature environment in the north, and no pipeline with such a structure that has both active heating and passive warming has been found so far. Summary of the invention

[0003] In order to solve the above problems, the object of the present invention is to provide a composite pipeline having both active heating and passive thermal insulation and a preparation method thereof.

[0004] In order to achieve the above-mentioned objectives, the composite pipeline with both active heating and passive thermal insulation provided by the present invention comprises an active heating pipeline and a passive thermal insulation device wrapped around the outside of the active heating pipeline; wherein the passive thermal insulation device is composed of a thermal insulation cover anti-corrosion outer skin, a thermal insulation cover inner core and a thermal insulation cover anti-corrosion inner skin which are arranged in sequence from the outside to the inside and the ends are sewn together; the active heating pipeline is composed of a pipeline wear-resistant outer skin, a pipeline heating part and a pipeline body which are arranged in sequence from the outside to the inside, and a gap is left between the pipeline wear-resistant outer skin and the pipeline heating part.

[0005] The anti-corrosion outer skin of the warming cover is composed of an anti-corrosion outer skin substrate of the warming cover and an anti-corrosion outer skin coating coated on the outer surface of the anti-corrosion outer skin substrate of the warming cover; wherein the material of the anti-corrosion outer skin coating of the warming cover is any one of polytetrafluoroethylene, polyvinylidene fluoride and silicone rubber, and the coating thickness is 1-3mm; the anti-corrosion outer skin substrate of the warming cover is a woven fabric made of at least one material selected from glass fiber, meta-aramid fiber, para-aramid fiber and polyimide fiber, and the basis weight is 150-250g / m 2 .

[0006] The inner core of the warm cover is a flake or needle-punched felt made of at least one of polyimide fiber, glass fiber, aramid fiber and flame-retardant polyester fiber, with a basis weight of 120-220g / m 2 .

[0007] The anti-corrosion endothelial layer of the warming cover is composed of an anti-corrosion endothelial layer substrate and an anti-corrosion endothelial layer coating coated on the inner surface of the anti-corrosion endothelial layer substrate; wherein the anti-corrosion endothelial layer substrate of the warming cover is a woven fabric made of at least one material selected from glass fiber, meta-aramid fiber, para-aramid fiber and polyimide fiber, with a basis weight of 150-250g / m 2 The material of the anti-corrosion endothelial coating of the thermal insulation cover is any one of polytetrafluoroethylene, polyvinylidene fluoride and silicone rubber, and the coating thickness is 0.5-3mm.

[0008] The pipeline wear-resistant outer skin consists of a pipeline wear-resistant outer skin body and a pipeline wear-resistant outer skin coating coated on the outer surface of the pipeline wear-resistant outer skin body; the material of the pipeline wear-resistant outer skin coating is any one of polyurethane and rubber, and the coating thickness is 0.1-5mm; the pipeline wear-resistant outer skin body is made of polyester filament weaving, and the thickness is 2-6mm.

[0009] The pipeline heating part consists of a pipeline heating plate and a pipeline bonding layer located on the inner side of the pipeline heating plate; the pipeline heating plate is made of any one of graphene and carbon fiber, with a power density of 50-1200W / ㎡, an input voltage of 5-36V, and a thickness of 0.2-1mm; the material of the pipeline bonding layer is any one of 9448A double-sided tape, 3M9080 double-sided tape, 3M8915 grid tape, Angolo grid tape and Yongyu double-sided tape, with a thickness of 0.1-5mm.

[0010] The pipeline body consists of a pipeline body braided layer and a pipeline body lining coated on the inner surface of the pipeline body braided layer; the pipeline body braided layer is made of polyester filaments and has a thickness of 2-6mm; the pipeline body lining and the pipeline heating plate are bonded together using the pipeline adhesive layer, and the gap is located between the pipeline heating plate and the pipeline wear-resistant outer skin body; the pipeline body lining is made of any one of polyurethane and rubber, and the coating thickness is 0.1-5mm.

[0011] The method for preparing the composite pipeline having both active heating and passive heat preservation comprises the following steps performed in sequence:

[0012] 1) Pre-treating the pipeline wear-resistant outer skin coating material, inserting it into a pipe with the pipeline wear-resistant outer skin body, and forming it on the outer surface of the pipeline wear-resistant outer skin body, thereby making the pipeline wear-resistant outer skin; pre-treating the pipeline body lining material, inserting it into a pipe with the pipeline body braided layer, and forming it on the inner surface of the pipeline body braided layer, thereby making the pipeline body; bonding the pipeline heating sheet to the pipeline body braided layer using the pipeline adhesive layer to make the pipeline heating part, and then combining the pipeline heating part with the pipeline body; under the premise of leaving a gap between the pipeline wear-resistant outer skin and the pipeline heating part, the pipeline wear-resistant outer skin, the pipeline heating part and the pipeline body are sewn together at the end to make an active heating pipeline;

[0013] 2) coating the material of the anti-corrosion outer skin coating of the warming cover on the outer surface of the anti-corrosion outer skin substrate of the warming cover and drying to form the anti-corrosion outer skin of the warming cover; coating the material of the anti-corrosion inner skin coating of the warming cover on the outer surface of the anti-corrosion inner skin substrate of the warming cover and drying to form the anti-corrosion inner skin of the warming cover; stacking the anti-corrosion outer skin of the warming cover, the inner core of the warming cover and the anti-corrosion inner skin of the warming cover together, and then sewing the ends to form a passive warming device;

[0014] 3) Finally, the passive heating device is wrapped around the outside of the active heating pipeline to produce a composite pipeline with both active heating and passive heating.

[0015] The composite pipeline with both active heating and passive thermal insulation and the preparation method provided by the present invention have the following beneficial effects: on the one hand, heat is provided to the medium in the composite pipeline by low-voltage active heating; on the other hand, heat loss is reduced by passive thermal insulation, thereby better maintaining the fluid state of the transmission medium in the composite pipeline in a low-temperature environment, and improving the efficiency of oil transmission or emergency rescue. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the cross-sectional structure of a composite pipeline having both active heating and passive thermal insulation provided by the present invention. DETAILED DESCRIPTION

[0017] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] Embodiment 1:

[0019] like Figure 1As shown, the composite pipeline with both active heating and passive thermal insulation provided in this embodiment includes an active heating pipeline 2 and a passive thermal insulation device 1 wrapped around the outside of the active heating pipeline 2; wherein the passive thermal insulation device 1 is composed of a thermal insulation cover anti-corrosion outer skin 1-1, a thermal insulation cover inner core 1-2 and a thermal insulation cover anti-corrosion inner skin 1-3 which are arranged in sequence from the outside to the inside and the ends are sewn together; the active heating pipeline 2 is composed of a pipeline wear-resistant outer skin 2-1, a pipeline heating part 2-2 and a pipeline body 2-3 which are arranged in sequence from the outside to the inside, and a gap 2-4 is left between the pipeline wear-resistant outer skin 2-1 and the pipeline heating part 2-2.

[0020] The thermal insulation cover anti-corrosion outer skin 1-1 is composed of a thermal insulation cover anti-corrosion outer skin substrate 1-1-2 and a thermal insulation cover anti-corrosion outer skin coating 1-1-1 coated on the outer surface of the thermal insulation cover anti-corrosion outer skin substrate 1-1-2; wherein the thermal insulation cover anti-corrosion outer skin coating 1-1-1 is made of polytetrafluoroethylene, and the coating thickness is 1.5mm; the thermal insulation cover anti-corrosion outer skin substrate 1-1-2 is a woven fabric made of 100% glass fiber, with a basis weight of 250g / m 2 .

[0021] The inner core 1-2 of the warm cover is a needle-punched felt made of 80% glass fiber and 20% aramid fiber, with a basis weight of 140g / m 2 .

[0022] The thermal insulation cover anti-corrosion endothelial 1-3 is composed of a thermal insulation cover anti-corrosion endothelial base material 1-3-1 and a thermal insulation cover anti-corrosion endothelial coating 1-3-2 coated on the inner surface of the thermal insulation cover anti-corrosion endothelial base material 1-3-1; wherein the thermal insulation cover anti-corrosion endothelial base material 1-3-1 is a woven fabric made of 80% meta-aramid fiber and 20% para-aramid fiber, with a basis weight of 200g / m 2 The material of the anti-corrosion inner coating 1-3-2 of the thermal insulation cover is silicone rubber, and the coating thickness is 1mm.

[0023] The pipeline wear-resistant outer skin 2-1 is composed of a pipeline wear-resistant outer skin body 2-1-2 and a pipeline wear-resistant outer skin coating 2-1-1 coated on the outer surface of the pipeline wear-resistant outer skin body 2-1-2; the material of the pipeline wear-resistant outer skin coating 2-1-1 is polyurethane, and the coating thickness is 0.7mm; the pipeline wear-resistant outer skin body 2-1-2 is made of polyester filament weaving, and the thickness is 6mm.

[0024] The pipeline heating part 2-2 consists of a pipeline heating plate 2-2-1 and a pipeline adhesive layer 2-2-2 located on the inner side of the pipeline heating plate 2-2-1; the pipeline heating plate 2-2-1 is made of carbon fiber with a power density of 800W / ㎡, an input voltage of 24V, and a thickness of 1mm; the material of the pipeline adhesive layer 2-2-2 is 9448A double-sided tape with a thickness of 1mm.

[0025] The pipeline body 2-3 is composed of a pipeline body braided layer 2-3-1 and a pipeline body lining 2-3-2 coated on the inner surface of the pipeline body braided layer 2-3-1; wherein the pipeline body braided layer 2-3-1 is made of polyester filaments and has a thickness of 5 mm; the pipeline body lining 2-3-2 and the pipeline heating plate 2-2-1 are bonded together by the pipeline adhesive layer 2-2-2, and the gap 2-4 is located between the pipeline heating plate 2-2-1 and the pipeline wear-resistant outer skin body 2-1-2; the pipeline body lining 2-3-2 is made of polyurethane and the coating thickness is 0.7 mm.

[0026] The method for preparing the composite pipeline with both active heating and passive heat preservation provided in this embodiment comprises the following steps performed in sequence:

[0027] 1) Pre-treating the wear-resistant outer skin coating 2-1-1 of the pipeline, inserting it into a pipe with the wear-resistant outer skin body 2-1-2, and forming it on the outer surface of the wear-resistant outer skin body 2-1-2, thereby forming the wear-resistant outer skin 2-1 of the pipeline; Pre-treating the lining 2-3-2 of the pipeline body, inserting it into a pipe with the braided layer 2-3-1 of the pipeline body, and forming it on the inner surface of the braided layer 2-3-1 of the pipeline body, thereby forming the pipeline body 2-3; Bonding the pipeline heating sheet 2-2-1 to the braided layer 2-3-1 of the pipeline body by using the pipeline adhesive layer 2-2-2 to form the pipeline heating part 2-2, and combining the pipeline heating part 2-2 with the pipeline body 2-3; Under the premise of leaving a gap 2-4 between the wear-resistant outer skin 2-1 and the heating part 2-2, the wear-resistant outer skin 2-1 of the pipeline, the heating part 2-2 and the pipeline body 2-3 are sewn at the ends to form the active heating pipeline 2;

[0028] 2) coating the material of the anti-corrosion outer skin coating 1-1-1 on the outer surface of the anti-corrosion outer skin substrate 1-1-2 of the warming cover and drying it to form the anti-corrosion outer skin 1-1 of the warming cover; coating the material of the anti-corrosion inner skin coating 1-3-2 on the outer surface of the anti-corrosion inner skin substrate 1-3-1 of the warming cover and drying it to form the anti-corrosion inner skin 1-3 of the warming cover; stacking the anti-corrosion outer skin 1-1 of the warming cover, the inner core 1-2 of the warming cover and the anti-corrosion inner skin 1-3 of the warming cover together, and then sewing the ends to form the passive warming device 1;

[0029] 3) Finally, the passive heating device 1 is wrapped around the outside of the active heating pipeline 2 to produce a composite pipeline with both active heating and passive heating.

[0030] When the composite pipeline with both active heating and passive heat preservation provided in this embodiment is used at an ambient temperature above -10°C, it is not necessary to connect the power supply of the pipeline heating plate 2-2-1, and only the passive heat preservation device 1 is used to reduce heat loss and ensure that the crude oil in the composite pipeline does not freeze. When the ambient temperature is lower than -10°C, the 24V power supply of the pipeline heating plate 2-2-1 is connected, and heat is provided to the medium in the composite pipeline by low-voltage active heating. Therefore, when the inner diameter of the water hose is 100mm, even if the crude oil is built in at an ambient temperature of -50°C, it will not freeze within 2 hours.

[0031] Embodiment 2:

[0032] The composite pipeline structure with both active heating and passive heat preservation and the preparation method provided in this embodiment are the same as those in embodiment 1. The difference is that the material of the anticorrosive outer skin coating 1-1-1 of the warming cover is silicone rubber, and the coating thickness is 1 mm; the anticorrosive outer skin substrate 1-1-2 of the warming cover is a woven fabric made of 90% meta-aramid fiber, 5% para-aramid fiber, and 5% polyimide fiber, with a basis weight of 150 g / m 2 .

[0033] The inner core 1-2 of the warm cover is a flake made of 80% polyimide fiber, 10% aramid fiber, and 10% flame-retardant polyester fiber, with a basis weight of 180g / m 2 .

[0034] The anti-corrosion lining substrate 1-3-1 of the thermal cover is a woven fabric made of 80% glass fiber and 20% polyimide fiber, with a basis weight of 190g / m 2 The material of the anti-corrosion endothelial coating 1-3-2 of the thermal insulation cover is polyvinylidene fluoride, and the coating thickness is 0.8mm.

[0035] The material of the pipeline wear-resistant outer coating 2-1-1 is rubber, and the coating thickness is 3.5mm; the pipeline wear-resistant outer coating body 2-1-2 is made of woven polyester filaments, and the thickness is 2.8mm.

[0036] The pipeline heating plate 2-2-1 is made of graphene with a power density of 500W / ㎡, an input voltage of 36V, and a thickness of 0.7mm; the material of the pipeline bonding layer 2-2-2 is Angolo grid tape with a thickness of 0.1mm.

[0037] The pipeline body braided layer 2-3-1 is made of polyester filaments and has a thickness of 3.6 mm; the pipeline body lining 2-3-2 is made of rubber and has a coating thickness of 2 mm.

[0038] When the composite pipeline with both active heating and passive heat preservation provided by this embodiment is used at an ambient temperature above -10°C, it is not necessary to connect the power supply of the pipeline heating plate 2-2-1, and only the passive heat preservation device 1 is used to reduce heat loss and ensure that the crude oil in the composite pipeline does not freeze. When the ambient temperature is lower than -10°C, the 36V power supply of the pipeline heating plate 2-2-1 is connected, and heat is provided to the medium in the composite pipeline by low-voltage active heating. Therefore, when the inner diameter of the water hose is 150mm, even if the crude oil is built in at an ambient temperature of -50°C, it will not freeze within 2 hours.

Claims

1. A composite pipeline with both active heating and passive heat preservation, characterized in that: The composite pipeline comprises an active heating pipeline (2) and a passive heating device (1) wrapped around the outside of the active heating pipeline (2); wherein the passive heating device (1) is composed of a heating cover anti-corrosion outer skin (1-1), a heating cover inner core (1-2) and a heating cover anti-corrosion inner skin (1-3) which are arranged in sequence from the outside to the inside and the ends are sewn together; the active heating pipeline (2) is composed of a pipeline wear-resistant outer skin (2-1), a pipeline heating part (2-2) and a pipeline body (2-3) which are arranged in sequence from the outside to the inside, and a gap (2-4) is left between the pipeline wear-resistant outer skin (2-1) and the pipeline heating part (2-2).

2. The composite pipeline with both active heating and passive heat preservation according to claim 1 is characterized in that: The thermal insulation cover anti-corrosion outer skin (1-1) is composed of a thermal insulation cover anti-corrosion outer skin substrate (1-1-2) and a thermal insulation cover anti-corrosion outer skin coating (1-1-1) coated on the outer surface of the thermal insulation cover anti-corrosion outer skin substrate (1-1-2); wherein the thermal insulation cover anti-corrosion outer skin coating (1-1-1) is made of any one of polytetrafluoroethylene, polyvinylidene fluoride and silicone rubber, and the coating thickness is 1-3 mm; the thermal insulation cover anti-corrosion outer skin substrate (1-1-2) is a woven fabric made of at least one of glass fiber, meta-aramid fiber, para-aramid fiber and polyimide fiber, and the basis weight is 150-250 g / m 2 .

3. The composite pipeline with both active heating and passive heat preservation according to claim 1 is characterized in that: The inner core (1-2) of the warm cover is a flake or needle-punched felt made of at least one material selected from polyimide fiber, glass fiber, aramid fiber and flame-retardant polyester fiber, with a basis weight of 120-220 g / m 2 .

4. The composite pipeline with both active heating and passive heat preservation according to claim 1 is characterized in that: The thermal insulation cover anti-corrosion endothelial (1-3) is composed of a thermal insulation cover anti-corrosion endothelial base material (1-3-1) and a thermal insulation cover anti-corrosion endothelial coating (1-3-2) coated on the inner surface of the thermal insulation cover anti-corrosion endothelial base material (1-3-1); wherein the thermal insulation cover anti-corrosion endothelial base material (1-3-1) is a woven fabric made of at least one material selected from glass fiber, meta-aramid fiber, para-aramid fiber and polyimide fiber, with a basis weight of 150-250 g / m 2 The material of the anti-corrosion endothelial coating (1-3-2) of the thermal insulation cover is any one of polytetrafluoroethylene, polyvinylidene fluoride and silicone rubber, and the coating thickness is 0.5-3mm.

5. The composite pipeline with both active heating and passive heat preservation according to claim 1 is characterized in that: The pipeline wear-resistant outer skin (2-1) is composed of a pipeline wear-resistant outer skin body (2-1-2) and a pipeline wear-resistant outer skin coating (2-1-1) coated on the outer surface of the pipeline wear-resistant outer skin body (2-1-2); wherein the material of the pipeline wear-resistant outer skin coating (2-1-1) is any one of polyurethane and rubber, and the coating thickness is 0.1-5mm; the pipeline wear-resistant outer skin body (2-1-2) is made of polyester filaments and has a thickness of 2-6mm.

6. The composite pipeline with both active heating and passive heat preservation according to claim 1 is characterized in that: The pipeline heating part (2-2) is composed of a pipeline heating plate (2-2-1) and a pipeline adhesive layer (2-2-2) located on the inner side of the pipeline heating plate (2-2-1); wherein the pipeline heating plate (2-2-1) is made of any one of graphene and carbon fiber, with a power density of 50-1200W / ㎡, an input voltage of 5-36V, and a thickness of 0.2-1mm; the material of the pipeline adhesive layer (2-2-2) is any one of 9448A double-sided tape, 3M9080 double-sided tape, 3M8915 grid tape, Angolo grid tape and Yongyu double-sided tape, with a thickness of 0.1-5mm.

7. The composite pipeline with both active heating and passive thermal insulation according to claim 1 is characterized in that: The pipeline body (2-3) is composed of a pipeline body braided layer (2-3-1) and a pipeline body lining (2-3-2) coated on the inner surface of the pipeline body braided layer (2-3-1); wherein the pipeline body braided layer (2-3-1) is made of polyester filaments and has a thickness of 2-6 mm; the pipeline body lining (2-3-2) and the pipeline heating plate (2-2-1) are bonded together by a pipeline adhesive layer (2-2-2), and a gap (2-4) is located between the pipeline heating plate (2-2-1) and the pipeline wear-resistant outer skin body (2-1-2); the pipeline body lining (2-3-2) is made of any one of polyurethane and rubber, and the coating thickness is 0.1-5 mm.

8. A method for preparing a composite pipeline having both active heating and passive heat preservation as claimed in any one of claims 1 to 7, characterized in that: The preparation method comprises the following steps performed in sequence: 1) Pre-treating the material of the pipeline wear-resistant outer skin coating (2-1-1), inserting it into a pipe with the pipeline wear-resistant outer skin body (2-1-2), and forming it on the outer surface of the pipeline wear-resistant outer skin body (2-1-2), thereby manufacturing the pipeline wear-resistant outer skin (2-1); pre-treating the material of the pipeline body lining (2-3-2), inserting it into a pipe with the pipeline body braided layer (2-3-1), and forming it on the inner surface of the pipeline body braided layer (2-3-1), thereby manufacturing the pipeline body (2-3); inserting the pipeline heating plate (2-2- 1) The pipeline adhesive layer (2-2-2) is bonded to the pipeline body braided layer (2-3-1) to form a pipeline heating part (2-2), and the pipeline heating part (2-2) is combined with the pipeline body (2-3); the pipeline wear-resistant outer skin (2-1), the pipeline heating part (2-2) and the pipeline body (2-3) are sewn together at the ends on the premise that a gap (2-4) is left between the pipeline wear-resistant outer skin (2-1) and the pipeline heating part (2-2) to form an active heating pipeline (2); 2) coating the material of the anti-corrosion outer skin coating (1-1-1) of the warming cover on the outer surface of the anti-corrosion outer skin substrate (1-1-2) of the warming cover and drying the coating to produce the anti-corrosion outer skin (1-1) of the warming cover; coating the material of the anti-corrosion inner skin coating (1-3-2) of the warming cover on the outer surface of the anti-corrosion inner skin substrate (1-3-1) of the warming cover and drying the coating to produce the anti-corrosion inner skin (1-3) of the warming cover; stacking the anti-corrosion outer skin (1-1) of the warming cover, the inner core (1-2) of the warming cover and the anti-corrosion inner skin (1-3) of the warming cover together, and then sewing the ends to produce the passive warming device (1); 3) Finally, the passive heating device (1) is wrapped around the outside of the active heating pipeline (2), so that a composite pipeline with both active heating and passive heating can be manufactured.

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