CN114251059A - Metal-reinforced corrosion-resistant composite coiled tubing embedded with small oil tube - Google Patents

Metal-reinforced corrosion-resistant composite coiled tubing embedded with small oil tube Download PDF

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Publication number
CN114251059A
CN114251059A CN202210098393.9A CN202210098393A CN114251059A CN 114251059 A CN114251059 A CN 114251059A CN 202210098393 A CN202210098393 A CN 202210098393A CN 114251059 A CN114251059 A CN 114251059A
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China
Prior art keywords
oil pipe
layer
built
embedded
resistant composite
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Pending
Application number
CN202210098393.9A
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Chinese (zh)
Inventor
陈伟豪
朱华升
王勇
张波
孟庆虎
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Shaanxi Xinxin Intelligent Pipe Co ltd
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Shaanxi Xinxin Intelligent Pipe Co ltd
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Priority to CN202210098393.9A priority Critical patent/CN114251059A/en
Publication of CN114251059A publication Critical patent/CN114251059A/en
Pending legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B32B1/08—Tubular products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/02—Layer formed of wires, e.g. mesh
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/043—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/082—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising vinyl resins; comprising acrylic resins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
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    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
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    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
    • B32B3/085—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts spaced apart pieces on the surface of a layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
    • E21B17/1085—Wear protectors; Blast joints; Hard facing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0261—Polyamide fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2262/02—Synthetic macromolecular fibres
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    • B32B2262/0269—Aromatic polyamide fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0276—Polyester fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/103—Metal fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/306—Resistant to heat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/548—Creep
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2597/00—Tubular articles, e.g. hoses, pipes

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

The invention provides a metal reinforced corrosion-resistant composite continuous oil pipe embedded with a small oil pipe, which comprises an inner liner layer, a reinforcing layer, an outer protective layer, a sliding wear-resistant layer, an insulating interlayer and a built-in oil pipe. The product has good flexibility, corrosion resistance, creep resistance, good joint sealing performance, simple and convenient installation and reusable high-temperature and high-pressure resistant composite continuous oil pipe, and a plurality of small-caliber stainless steel built-in oil pipes are embedded in the pipe wall and used for assisting the oil field to carry out other downhole operations and the requirement of data acquisition in the oil well. The built-in oil pipe can bear corrosion of underground media, is high in external pressure resistance and tensile strength, can be in service for a long time in a high-temperature and high-pressure environment, meanwhile, a stainless steel built-in oil pipe (with the inner diameter of 3-6mm) is embedded in the pipe wall of a product, effective control over underground tools can be achieved by using the small oil pipe and an oil pipe internal through signal cable, and meanwhile, real-time monitoring, data acquisition, sampling and other work of well conditions at the bottom of a well can be completed.

Description

Metal-reinforced corrosion-resistant composite coiled tubing embedded with small oil tube
Technical Field
The invention relates to the field of pipeline equipment, in particular to a metal reinforced corrosion-resistant composite continuous oil pipe embedded with a small oil pipe.
Background
Along with the increase of the time of oil field exploitation, digital equipment is applied more and more, production enterprises have requirements on energy conservation, emission reduction, cost reduction and efficiency improvement, steel oil pipes in the traditional sense only have the function of pressure-bearing conveying, the efficiency is low, the energy consumption is high, the steel oil pipes are easy to corrode and lose efficacy, the construction operation efficiency is low, the production requirements cannot be effectively met, and the steel oil pipes are basically scrapped after being damaged and difficult to repair.
In the current production process of oil wells in oil fields, the oil pipes in the oil wells are generally made of steel, due to the fact that corrosion of underground conveying media and corrosion failure of the oil pipes caused under the high-temperature and high-pressure environment frequently occur, accidents often occur, the well repairing operation task of the oil fields is heavy, the production cost is increased, effective control of underground tools is affected, and real-time monitoring, data acquisition, sampling and other work on well conditions at the bottom of the well cannot be conducted.
Disclosure of Invention
The invention aims to provide a metal reinforced corrosion-resistant composite continuous oil pipe embedded with a small oil pipe so as to solve the problems in the background art.
In order to achieve the above purpose, the invention provides the following technical scheme: a metal reinforced corrosion-resistant composite coiled tubing embedded with a small tubing comprises:
an inner liner layer;
the reinforcing layers are tightly wound on the outer layer of the inner lining layer at a set pitch and a winding angle of 42-88 degrees, the number of wound layers is an even number, a layer of high polymer with the thickness of 1-2mm is coated between the reinforcing layers of the even number to serve as a sliding wear-resistant layer, and a high polymer insulating interlayer with the thickness of 1-2mm is coated outside the reinforcing layers;
the tensile layer is tightly wound on the outer layer of the reinforcing layer at a set pitch and a winding angle of 20-60 degrees, and the number of wound layers is an even number;
the built-in oil pipe is spirally wound on the insulating interlayer outside the tensile layer along the axial direction at a winding angle of 60-80 degrees, and the high polymer insulating interlayer with the thickness of 2mm is extruded and coated outside the built-in oil pipe;
and the outer protective layer is coated outside the built-in oil pipe.
Further, in the present invention, the number of winding layers and the diameter of the reinforcing layer and the tensile layer are set according to a set value of the tensile force.
Further, in the present invention, the inner liner layer is formed by extrusion molding of PE, PEX, PERT, HDPE, PP, PA, PPs, PVDF, or a modified polymer.
Further, in the invention, the material of the enhancement layer is a high-strength steel belt or a stainless steel belt and a steel wire belt;
furthermore, in the invention, the tensile layer is made of plastic-coated steel wires, stainless steel wires, polyester fiber wires/belts or aramid fiber wires/belts, and the width of the tensile layer is 20-50 mm.
Further, in the invention, the outer protection layer is formed by extrusion coating of a high molecular polymer, and the coating material is HDPE, PP, PA, PPS, PVDF or a modified high molecular polymer.
Furthermore, in the invention, the length of the wound built-in oil pipe is longer than that of the composite continuous oil pipe, and the joints of the built-in oil pipe are connected in a clamping type connection, a screw thread connection or a welding mode.
Furthermore, in the invention, the inner diameter of the built-in oil pipe is 3-6mm, and the built-in oil pipe is internally penetrated with a signal cable or an optical fiber to realize effective control on an underground tool and simultaneously complete the work of real-time monitoring of well conditions at the bottom of a well, data acquisition, sampling and the like.
The beneficial effects are that the technical scheme of this application possesses following technological effect:
1. the invention provides a multifunctional underground composite coiled tubing which has the advantages of good flexibility, corrosion resistance, good creep resistance, good joint sealing performance, simple and convenient installation and reusability, and a plurality of small-caliber stainless steel tubing embedded in the tube wall is used for assisting the oil field to carry out other underground operations and the requirement of data acquisition in the oil well.
2. The invention provides a corrosion-resistant high-pressure-bearing composite continuous oil pipe which can bear the corrosion of underground media, has strong external pressure resistance and tensile strength, can be used for a long time in a high-temperature and high-pressure environment, is embedded with a stainless steel built-in oil pipe (with the inner diameter of 3-6mm) in the pipe wall of a product, can realize effective control on an underground tool by utilizing the built-in oil pipe and an oil pipe internal through signal cable, and can complete the work of real-time monitoring, data acquisition, sampling and the like of well conditions at the bottom of a well.
It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of this disclosure unless such concepts are mutually inconsistent.
The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of specific embodiments in accordance with the teachings of the present invention.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic cross-sectional view of the structure of the present invention.
FIG. 2 is an exploded view of the present invention.
In the figures, the meaning of the reference numerals is as follows: 1. an inner liner layer; 2. an enhancement layer; 3. a tensile layer; 4. an oil pipe is arranged inside; 5. and an outer protective layer.
Detailed Description
In order to better understand the technical content of the present invention, specific embodiments are described below with reference to the accompanying drawings. In this disclosure, aspects of the present invention are described with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the present disclosure are not necessarily defined to include all aspects of the invention. It should be appreciated that the various concepts and embodiments described above, as well as those described in greater detail below, may be implemented in any of numerous ways, as the disclosed concepts and embodiments are not limited to any one implementation. In addition, some aspects of the present disclosure may be used alone, or in any suitable combination with other aspects of the present disclosure.
As shown in fig. 1-2, the metal reinforced corrosion-resistant composite coiled tubing with the embedded small tubing comprises an inner liner layer 1, a reinforcing layer 2, a tensile layer 3, a sliding wear-resistant layer, an insulating interlayer, an internal tubing 4 and an external protective layer 5.
1. The inner liner layer 1 is formed by extrusion molding of HDPE/PP/PA/PPS/PVDF or modified high molecular polymer. The main functions are as follows: a channel for conveying a medium; the performance of the material meets the requirement of GB/T15558.1; when PEX is adopted, the performance of the material meets the requirement of GB/T18992.2; when PERT is adopted, the performance of the material meets the requirement of GB/T28799.2; when PA is adopted, the performance of the material meets the requirement of ISO 22621-1; when PP is adopted, the performance of the polypropylene composite material meets the requirement of GB/T18742.2; when PVDF is used, the properties are in accordance with the requirements of ISO 10931; the lining pipe material can be natural color, and the material should not use return materials. The working condition environment applicability of the lining layer material is in accordance with: GB/T34903.1.
2. The enhancement layer 2 is formed by tightly winding a high-strength steel belt or a stainless steel belt on the outer diameter of the lining layer 1 at a winding angle of 42-88 degrees with respect to the axial line of the lining layer 1, and the winding pitch is determined according to different specifications of products; the number of winding layers is even, a layer of high molecular polymer with the thickness of 1-2mm is coated between the steel strips to serve as a sliding wear-resistant layer, the steel strips are spirally wound, and the wear-resistant strips are wound at an angle of 20-70 degrees; the outermost layer of steel belt is coated with 1-2mm of high molecular polymer insulating interlayer, which has the main functions: bears the internal pressure during medium transportation and bears a certain external pressure resistance and a certain impact resistance of the pipe body; further, welding or non-welding is performed between the steel bands of the wire spiral wound steel bands or the stainless steel bands (welded or not welded, left-handed, right-handed, even-numbered layers). Steel wire belts, cellulose and fiber belts are added, the layers can be bonded or not bonded, and the bonding (thermoplastic) performance meets the requirement of GB/T711-2008; or the performance of the stainless steel strip is in accordance with GB/T3280-2009.
3. The tensile layer 3 is formed by tightly weaving or winding plastic-coated steel wires, stainless steel wires or polyester fiber wires/tapes and aramid fiber wires/tapes at a certain pitch and a winding angle of 20-60 degrees on the outer layer of the reinforcement layer 2, the width of the tensile layer is 20-50mm, the winding pitch is determined according to different product specifications, the number of wound layers is an even number of layers, and the number of woven layers and the caliber of the steel wires are determined according to the design of a tensile force set value. The main functions are as follows: the tensile capacity and certain external impact resistance of the pipe body are improved; furthermore, the tensile layer is mainly made of plastic-coated steel wires and stainless steel wires. When the terylene industrial filament and the aramid industrial filament are adopted: the polyester industrial filament yarn is required to meet the following requirements: GB/T16604, aramid industrial filament YD/T1182.2.
4. The outer protective layer 5 is formed and coated by high molecular polymer extrusion, and the coating material is as follows: HDPE/PP/PA/PPS/PVDF or modified high molecular polymer, its main effect is: the external abrasion resistance of the product is improved, the product is protected from being damaged by external force, and the thickness is larger than or equal to 3 mm.
5. The built-in oil pipe 4 (steel small-caliber, stainless steel or other anti-corrosion materials) is sequentially and spirally wound on the external insulating interlayer of the enhancement layer 2 along the axial direction of the pipe body at a winding angle of 60-80 degrees, the two ends of the wound built-in oil pipe 4 are longer than the length of the composite continuous oil pipe, and the joints of the ports of the built-in oil pipe 4 are generally connected in a clamping type connection, a screw thread connection and a welding mode. The function is that the pipe body has small-bore passages at two ends, and medium circulation and signal cable passing can be realized.
The embodiment has the following advantages:
1. the invention can effectively solve the problem of underground corrosion of the steel oil pipe, and has the capabilities of bearing high pressure, resisting external pressure, resisting high temperature and resisting tension;
2. the invention has the high-quality characteristics of long single length, strong toughness, high safety factor, convenient operation, maintenance link reduction, long service life and the like, provides a stable and safe production environment for the oil field, saves the use cost and improves the investment benefit.
3. Meanwhile, a stainless steel built-in oil pipe (the inner diameter is 3-6mm) is embedded in the pipe wall of the product, effective control over downhole tools can be achieved by using the built-in oil pipe and a signal cable penetrating through the oil pipe, and meanwhile, real-time monitoring, data acquisition, sampling and other work of well conditions at the bottom of a well can be completed.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims (8)

1. The utility model provides a corrosion-resistant compound coiled tubing of metal reinforcement of embedded little oil pipe which characterized in that: the method comprises the following steps:
an inner liner layer;
the reinforcing layers are tightly wound on the outer layer of the inner lining layer at a set pitch and a winding angle of 42-88 degrees, the number of wound layers is an even number, a layer of high polymer with the thickness of 1-2mm is coated between the reinforcing layers of the even number to serve as a sliding wear-resistant layer, and a high polymer insulating interlayer with the thickness of 1-2mm is coated outside the reinforcing layers;
the tensile layer is tightly wound on the outer layer of the reinforcing layer at a set pitch and a winding angle of 20-60 degrees, and the number of wound layers is an even number;
the built-in oil pipe is spirally wound on the insulating interlayer outside the tensile layer along the axial direction at a winding angle of 60-80 degrees, and the high polymer insulating interlayer with the thickness of 2mm is extruded and coated outside the built-in oil pipe;
and the outer protective layer is coated outside the built-in oil pipe.
2. The metal reinforced corrosion-resistant composite coiled tubing embedded with the small tubing according to claim 1, wherein: the number of winding layers and the caliber of the reinforcing layer and the tensile layer are set according to a set value of the tensile force.
3. The metal reinforced corrosion-resistant composite coiled tubing embedded with the small tubing according to claim 1, wherein: the lining layer is formed by PE, PEX, PERT, HDPE, PP, PA, PPS, PVDF or modified high molecular polymer in an extrusion mode.
4. The metal reinforced corrosion-resistant composite coiled tubing embedded with the small tubing according to claim 1, wherein: the material of the enhancement layer is a high-strength steel belt or a stainless steel belt and a steel wire belt;
5. the metal reinforced corrosion-resistant composite coiled tubing embedded with the small tubing according to claim 1, wherein: the tensile layer is made of plastic-coated steel wires, stainless steel wires, polyester fiber wires/belts or aramid fiber wires/belts, and the width of the tensile layer is 20-50 mm.
6. The metal reinforced corrosion-resistant composite coiled tubing embedded with the small tubing according to claim 1, wherein: the outer protective layer is formed by extruding and coating a high polymer, and the coating material is HDPE, PP, PA, PPS, PVDF or a modified high polymer.
7. The metal reinforced corrosion-resistant composite coiled tubing embedded with the small tubing according to claim 1, wherein: the length of the wound built-in oil pipe is longer than that of the composite continuous oil pipe, and joints of the built-in oil pipe are connected in a clamping type connection mode, a threaded connection mode or a welding mode.
8. The metal reinforced corrosion-resistant composite coiled tubing embedded with the small tubing according to claim 1, wherein: the inner diameter of the built-in oil pipe is 3-6mm, the built-in oil pipe can be internally penetrated by a signal cable or an optical fiber to realize effective control of an underground tool, and meanwhile, the work of real-time monitoring, data acquisition, sampling and the like of well conditions at the bottom of a well can be completed.
CN202210098393.9A 2022-01-19 2022-01-19 Metal-reinforced corrosion-resistant composite coiled tubing embedded with small oil tube Pending CN114251059A (en)

Priority Applications (1)

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CN202210098393.9A CN114251059A (en) 2022-01-19 2022-01-19 Metal-reinforced corrosion-resistant composite coiled tubing embedded with small oil tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210098393.9A CN114251059A (en) 2022-01-19 2022-01-19 Metal-reinforced corrosion-resistant composite coiled tubing embedded with small oil tube

Publications (1)

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CN114251059A true CN114251059A (en) 2022-03-29

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