CN115264190A

CN115264190A - Coilable tubing

Info

Publication number: CN115264190A
Application number: CN202210811558.2A
Authority: CN
Inventors: 蒯一希
Original assignee: Sichuan Jinshi Oriental New Material Technology Co ltd
Current assignee: Sichuan Jinshi Oriental New Material Technology Co ltd
Priority date: 2022-07-11
Filing date: 2022-07-11
Publication date: 2022-11-01

Abstract

The invention relates to the technical field of composite pipes, and discloses a coilable pipe. The pipe comprises a core pipe (20) with a medium flow channel with the same cross section and a corrugated protection layer (10) sleeved on the outer side of the core pipe (20), wherein the outer surface of the core pipe (20) is attached to the minimum inner diameter of the corrugated protection layer (10), and the corrugated protection layer (10) at least comprises a metal corrugated protection layer (11), an anti-corrosion layer (12) and a plastic outer protection layer (13) which are arranged from inside to outside. According to the technical scheme, the corrugated protective layer is arranged on the outer side of the core pipe, so that the rigidity of the pipe is improved, the axial tensile strength and external pressure resistance of the pipe are improved, the roundness of the core pipe is ensured, and the core pipe is not damaged when the pipe is coiled, unreeled and laid. In addition, the corrugated protective layer is provided with the plastic outer protective layer at the outer sides of the metal corrugated protective layer and the anticorrosive layer, so that the anticorrosive layer and the metal corrugated outer protective layer are further protected.

Description

Coilable tubing

Technical Field

The invention relates to the technical field of composite pipes, in particular to a coilable pipe.

Background

Reinforced Thermoplastic Pipes (RTP for short) can be classified into oil production wellhead Pipes (applied between an oil well and a separation station, a gathering station and a water injection station), underground Pipes, ocean conveying Pipes, ocean oil platform Pipes and the like according to application scenes. The national energy agency successively issues standards of SY/T6662.1-2012, SY/T6794-2018, SY/T6662.2-2020 and the like, and the standards not only standardize the use of non-metal composite tubes in industries such as petroleum and natural gas, but also improve the requirements on the performance of RTP tubes.

In the prior art, the performance of the reinforced layer is easy to damage and lose efficacy under the repeated impact of waves in the ocean platform or ocean transportation of the RTP pipe without the protective layer. In addition, the underground pipe is subjected to axial tension such as gravity and the like vertically downward during installation and use, so that the structure of the underground pipe is easily damaged.

Therefore, it is necessary to provide a pipe material which further improves the performance of the pipe material while meeting the requirements of national standards.

Disclosure of Invention

The invention aims to solve the problem of poor pipe performance in the prior art, and provides a coilable pipe which has the advantage of improving the tensile property, the compressive property and the like of the pipe.

In order to achieve the above object, in one aspect, the present invention provides a coilable tubing, where the tubing includes a core tube having a medium flow channel with a uniform cross section, and a corrugated protection layer sleeved outside the core tube, an outer surface of the core tube is attached to a minimum inner diameter of the corrugated protection layer, and the corrugated protection layer at least includes a metal corrugated protection layer, an anticorrosion layer, and a plastic outer protection layer arranged from inside to outside.

Optionally, the core tube is a pure plastic core tube.

Optionally, the corrugated protection layer comprises a polyester film layer located between the anticorrosion layer and the plastic outer protection layer, and the polyester film layer is wound on the outer side of the anticorrosion layer.

Optionally, the core pipe is sequentially provided with an inner plastic layer, a reinforcing layer and an outer plastic layer from inside to outside, wherein the reinforcing layer is wound on the outer side of the inner plastic layer.

Optionally, the core tube includes a wear-resistant layer located inside the plastic inner layer, and/or both the plastic inner layer and the plastic outer layer are made of high-density polyethylene.

Optionally, the wear-resistant layer is made of nylon, and the wear-resistant layer is bonded to the inner surface of the plastic inner layer through an adhesive.

Optionally, the plastics inlayer is first plastics inlayer, barrier layer and second plastics inlayer from interior to exterior in proper order, the inside and outside both sides of barrier layer respectively through the adhesive with first plastics inlayer and the bonding of second plastics inlayer, wherein, first plastics inlayer, second plastics inlayer and the outer material of plastics is high density polyethylene.

Optionally, the outer side of the plastic outer layer is provided with a sliding layer to enable the corrugated protection layer to move axially relative to the core tube.

Optionally, the sliding layer is at least one of a wire, a thin strip or a thin film.

Optionally, the reinforcement layer is at least one of steel strip, steel wire, steel cord strip, or non-metallic reinforcement strip.

Optionally, the coilable tubing includes an energy transmission device located between the core tube and the corrugated protective layer and arranged axially along an outer surface of the core tube.

Optionally, the energy transmission device is arranged in at least one of a single, bundled or ribbon form, and/or the energy transmission device is at least one of a communication cable, a detection cable, a fiber optic cable or a heating wire.

Optionally, a heat insulation layer is arranged between the anticorrosive layer and the plastic outer protection layer, and/or a heat insulation layer is arranged between the core pipe and the corrugated protection layer.

Optionally, the outer contour shape of the corrugated protection layer is at least one of annular corrugation, spiral corrugation, circular arc corrugation with straight line segment in the wave trough, rectangular corrugation, trapezoidal corrugation and folded corrugation without sharp corner.

Optionally, the material of the anticorrosive layer is at least one of epoxy asphalt, asphalt cloth or heavy anticorrosive paint, or the anticorrosive layer is one of single-layer anticorrosion or multi-layer anticorrosion.

Through the technical scheme, the corrugated protective layer is arranged on the outer side of the core pipe, so that the rigidity of the pipe is improved, the axial tensile strength and external pressure resistance of the pipe are improved, the roundness of the core pipe is ensured, and the core pipe is not damaged when the pipe is coiled, uncoiled and laid. In addition, the corrugated protective layer is provided with the plastic outer protective layer on the outer sides of the metal corrugated protective layer and the anticorrosive layer, and the anticorrosive layer and the metal corrugated outer protective layer are further protected by utilizing the scratch resistance and abrasion resistance of the plastic material.

Drawings

FIG. 1 is a half-sectional view of one embodiment of the coilable tubing of the present invention;

FIG. 2 is an enlarged schematic view at I of FIG. 1;

FIG. 3 isbase:Sub>A cross-sectional view at A-A of one embodiment of the coilable tubing of FIG. 1;

FIG. 4 isbase:Sub>A cross-sectional view at A-A of another embodiment of the coilable tubing of FIG. 1;

FIG. 5 is a half-sectional view of another embodiment of the coilable tubing of the present invention;

FIG. 6 is an enlarged schematic view at II of FIG. 5;

FIG. 7 is a half-sectional view of yet another embodiment of the coilable tubing of the present invention;

FIG. 8 is an enlarged schematic view at III of FIG. 7;

FIG. 9 is a half-sectional view of yet another embodiment of the coilable tubing of the present invention;

FIG. 10 is an enlarged schematic view at IV in FIG. 9;

FIG. 11 is a half-sectional view of yet another embodiment of the coilable tubing of the present invention;

FIG. 12 is an enlarged schematic view at V of FIG. 11;

FIG. 13 is a cross-sectional view taken at B-B of FIG. 12;

FIG. 14 is an embodiment of the outer contour shape of the corrugated protective layer according to the present invention;

FIG. 15 is another embodiment of the outer contour shape of the corrugated protective layer according to the present invention;

FIG. 16 shows another embodiment of the outer contour shape of the corrugated protective layer according to the present invention;

FIG. 17 is a further embodiment of the outer contour shape of the corrugated protective layer according to the present invention;

FIG. 18 shows a further embodiment of the outer contour of the corrugated protective layer according to the present invention.

Description of the reference numerals

10-a corrugated protective layer; 11-a metal corrugated protective layer; 12-an anticorrosive layer; 13-a plastic outer protective layer; 14-a polyester film layer; 20-a core tube; 21-pure plastic core tube; 22-inner plastic layer; 221-a first plastic inner layer; 222-a barrier layer; 223-a second plastic inner layer; 224-a binder; 23-an enhancement layer; 24-an outer layer of plastic; 25-a wear resistant layer; 26-a sliding layer; 30-energy transmission means.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation. In the present invention, the terms of orientation such as "inside and outside" used in the case where no description is made to the contrary, refer to the inside and outside with respect to the outline of each member itself.

The invention provides a coilable pipe, which comprises a core pipe 20 with a medium flow channel with a uniform section and a corrugated protection layer 10 sleeved outside the core pipe 20, wherein the outer surface of the core pipe 20 is attached to the minimum inner diameter of the corrugated protection layer 10, and the corrugated protection layer 10 at least comprises a metal corrugated protection layer 11, an anticorrosive layer 12 and a plastic outer protection layer 13 which are arranged from inside to outside. The material of the anticorrosive layer 12 may be at least one of epoxy asphalt, asphalt cloth, or heavy anticorrosive paint. In addition, the corrosion protection layer 12 may be a single layer corrosion protection layer or a multi-layer corrosion protection layer, wherein the multi-layer corrosion protection layer may be, for example, a combination of multiple corrosion protection structures formed by winding multiple layers of corrosion protection cloth.

Through the technical scheme, the corrugated protection layer 10 is arranged on the outer side of the core tube 20, so that the rigidity of the tube is improved, the axial tensile strength and external pressure resistance of the tube are improved, the roundness of the core tube 20 is ensured, and the core tube is not damaged when the tube is coiled, unreeled and laid. In addition, in the corrugated protection layer 10 of the present invention, the plastic outer protection layer 13 is disposed outside the metal corrugated protection layer 11 and the corrosion-resistant layer 12, and the corrosion-resistant layer 12 and the metal corrugated outer protection layer 11 are further protected by using the scratch-resistant and abrasion-resistant characteristics of the plastic material.

Specifically, in one embodiment of the present invention, the outer surface of the core tube 20 is attached to the minimum inner diameter of the corrugated protection layer 10 without adhesion, and the plastic outer protection layer 13 is attached to the corrosion prevention layer 12 without adhesion. Further, the tubing herein is flexible, coilable, having an outer diameter of 2 inches to 8 inches, with coils commonly used in international and domestic applications below 6 inches. To reduce the joints between the pipes, 1 coiled pipe is larger than 200 meters.

As shown in fig. 1 to 3, in one embodiment of the present invention, the core tube 20 may be a pure plastic core tube 21.

When the coilable tubing is applied to the scenes such as petroleum and ocean drilling platforms as a wellhead conveying pipe and a downhole pipe, a medium transmitted in the core pipe 20 needs to be heated sometimes, or cables such as communication detection and the like are put down to a well or a platform along with the tubing. Thus, in a preferred embodiment of the invention, as shown in fig. 4, the coilable tubing material comprises an energy transmission device 30 located between the core tube 20 and the corrugated protective layer 10 and arranged axially along the outer surface of the core tube 20. Wherein, the arrangement form of the energy transmission device 30 can be at least one of single, bundle or flat belt, according to the application scenario. In addition, the energy transmission device 30 may be at least one of a communication cable, a detection cable, an optical cable, or a heating wire according to the signal or energy to be transmitted. It is understood that a plurality of energy transmission devices 30 may be disposed between the core tube 20 and the corrugated protective layer 10 to extend axially along the outer surface of the core tube 20, and the kinds of the energy transmission devices 30 may be one or more.

Further, in order to insulate the medium transmitted in the core pipe 20, an insulating layer may be disposed between the anticorrosive layer 12 and the plastic outer protective layer 13, and an insulating layer may be disposed between the core pipe 20 and the corrugated protective layer 10.

As a preferred embodiment, referring to fig. 5 and 6, the core tube 20 includes an inner plastic layer 22, a reinforcing layer 23, and an outer plastic layer 24 in sequence from inside to outside, wherein the reinforcing layer 23 is wound around the outer side of the inner plastic layer 22, and both the inner plastic layer 22 and the outer plastic layer 24 are made of High Density Polyethylene (HDPE), which has advantages of acid and alkali resistance, organic solvent resistance, excellent electrical insulation, and capability of maintaining a certain toughness at low temperature. In addition, the reinforcement layer 23 is at least one of a steel belt, a steel wire, a steel cord belt, or a non-metal reinforcement belt, and the non-metal reinforcement belt may be made of glass fiber, polyester fiber, or aramid fiber.

In another embodiment of the present invention, as shown in fig. 7 to 13, the corrugated protection layer 10 includes a polyester film layer 14 between the corrosion protection layer 12 and the plastic outer protection layer 13, and the polyester film layer 14 is wound on the outer side of the corrosion protection layer 12. The polyester film layer 14 is used for wrapping the anti-corrosion layer 12, and is further beneficial to being combined with the plastic outer protection layer 13.

In a preferred embodiment of the invention, as shown in fig. 7 to 13, the plastic outer layer 24 is provided with a sliding layer 26 on the outside to enable the corrugated protective layer 10 to move axially relative to the core tube 20. Wherein, the sliding layer 26 may be at least one of a wire, a thin strip or a thin film. The main function of the sliding layer 26 is to allow a certain relative displacement between the core tube 20 and the corrugated outer protective layer 10, and to prevent stress or direct friction damage during coiling, uncoiling or flexible laying of the pipe.

As shown in fig. 9 and 10, in one embodiment, the core tube 20 includes a wear layer 25 located inside the plastic inner layer 22. The material of the wear-resistant layer 25 may be nylon, and the wear-resistant layer 25 may be bonded to the inner surface of the plastic inner layer 22 by an adhesive.

As shown in fig. 11 to 13, in a preferred embodiment of the present invention, the inner plastic layer 22 includes a first inner plastic layer 221, a barrier layer 222 and a second inner plastic layer 223 sequentially from inside to outside, the inner and outer sides of the barrier layer 222 are respectively adhered to the first inner plastic layer 221 and the second inner plastic layer 223 by an adhesive 224, wherein the first inner plastic layer 221, the second inner plastic layer 223 and the outer plastic layer 24 are preferably made of high density polyethylene. The barrier layer 222 is a material capable of blocking, for example, hydrogen or other small molecule substances, and prevents the small molecule substances from penetrating through gaps between the high density polyethylene molecules to corrode the outer side.

Further, the outer contour shape of the corrugated protective layer 10 in the present invention may be a ring-shaped corrugation or a spiral-shaped corrugation, and in the embodiment of the outer contour shape of the corrugated protective layer 10 shown in fig. 14 to 18, the outer contour shape of the corrugated protective layer 10 may be a corrugation in which peaks and valleys are circular arcs and the peaks and valleys are connected by straight lines (see fig. 14), a fold-shaped corrugation in which a corner is a circular arc (see fig. 15), a corrugation in which peaks and valleys are circular arcs and the peaks and valleys are connected by vertical straight lines (see fig. 16), a rectangular corrugation in which a corner is a circular arc (see fig. 17), a trapezoidal corrugation in which a corner is a circular arc or a corrugation in which a peak is a circular arc valley is a straight line, a peak and a valley are connected by straight lines, and a valley and a straight line is a circular arc (see fig. 18).

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, numerous simple modifications can be made to the technical solution of the invention, including combinations of the specific features in any suitable way, and the invention will not be further described in relation to the various possible combinations in order to avoid unnecessary repetition. Such simple modifications and combinations should also be considered as disclosed in the present invention, and all such modifications and combinations are intended to be included within the scope of the present invention.

Claims

1. The coilable pipe is characterized by comprising a core pipe (20) with a medium flow channel with a uniform section and a corrugated protection layer (10) sleeved on the outer side of the core pipe (20), wherein the outer surface of the core pipe (20) is attached to the minimum inner diameter of the corrugated protection layer (10), and the corrugated protection layer (10) at least comprises a metal corrugated protection layer (11), an anti-corrosion layer (12) and a plastic outer protection layer (13) which are arranged from inside to outside.

2. Coilable tubing according to claim 1, wherein the core tube (20) is a pure plastic core tube (21).

3. Coilable tubing according to claim 1, wherein the corrugated protective layer (10) comprises a polyester film layer (14) between the corrosion protection layer (12) and the plastic outer protective layer (13), the polyester film layer (14) being wound on the outside of the corrosion protection layer (12).

4. The coilable tubing of claim 1, wherein the core tube (20) comprises, from inside to outside, an inner layer (22) of plastic, a reinforcing layer (23) and an outer layer (24) of plastic, wherein the reinforcing layer (23) is wound around the outer side of the inner layer (22) of plastic.

5. The coilable tubing according to claim 4, wherein the core tube (20) comprises a wear layer (25) inside the inner plastic layer (22) and/or wherein the inner plastic layer (22) and the outer plastic layer (24) are both of high density polyethylene.

6. The coilable tube according to claim 5, wherein the wear layer (25) is of nylon and the wear layer (25) is bonded to the inner surface of the plastic inner layer (22) by an adhesive.

7. The coilable tubing according to claim 4, wherein the inner plastic layer (22) comprises a first inner plastic layer (221), a barrier layer (222) and a second inner plastic layer (223) from inside to outside, the barrier layer (222) is bonded to the first inner plastic layer (221) and the second inner plastic layer (223) through an adhesive (224) on the inner side and the outer side respectively, and the first inner plastic layer (221), the second inner plastic layer (223) and the outer plastic layer (24) are all made of high-density polyethylene.

8. The coilable tube according to any one of claims 3 to 7, wherein the outer plastic layer (24) is provided with a sliding layer (26) on the outside to enable the corrugated protective layer (10) to move axially relative to the core tube (20).

9. The coilable tubing of claim 8, wherein the sliding layer (26) is at least one of a wire, a ribbon, or a film.

10. The coilable tube according to claim 4, wherein the reinforcement layer (23) is at least one of a steel strip, a steel wire, a steel cord strip or a non-metallic reinforcement strip.

11. The coilable tubing of claim 1, comprising an energy transmission device (30) located between the core tube (20) and the corrugated protective layer (10) and arranged axially along the outer surface of the core tube (20).

12. The tubing according to claim 11, wherein the energy transmission device (30) is arranged in at least one of a single, bundled or ribbon form, and/or wherein the energy transmission device (30) is at least one of a communication cable, a test cable, an optical cable or a heating wire.

13. Coilable tubing according to claim 1, wherein an insulation layer is provided between the corrosion protection layer (12) and the plastic outer protection layer (13) and/or an insulation layer is provided between the core tube (20) and the corrugated protection layer (10).

14. The coilable tubing according to claim 1, wherein the corrugated protective layer (10) has an outer contour shape of at least one of a ring-shaped corrugation, a spiral-shaped corrugation, a circular-arc-shaped corrugation with straight line segments in the wave trough, a rectangular corrugation, a trapezoidal corrugation, and a folded corrugation without sharp angles.

15. The coilable tubing according to claim 1, wherein the corrosion protection layer (12) is made of at least one of epoxy asphalt, asphalt cloth, or heavy duty paint, or the corrosion protection layer (12) is one of single layer corrosion protection or multi-layer corrosion protection.