Tension-resistant composite pipe for shafts

Abstract

Provided is a tensile composite pipe for a shaft, a reinforcing layer being tightly wound on the outer wall of the inner liner in a multi-layer cross manner along the axis direction of the inner liner, the tensile layer being used to provide axial tensile strength to the pipe body hoisted vertically, and the tensile layer being tightly wound on the outer wall of the reinforcing layer in a multi-layer variable-angle manner with the angle of adjacent two layers being symmetrically distributed in the range of 10-65°, and the outer protective layer being wrapped and fixed on the outside of the tensile layer. The utility model adopts the design principle of complementary performance, maximizes the axial tensile effect of the material, avoids the pipe body from being torn when the pipe body is vertically hoisted and installed, has high tensile strength and stable performance, greatly reduces the investment cost of the pipeline, simultaneously reduces the maintenance cost in the later period due to frequent replacement of the pipeline, the structure layer of the tensile composite pipe is stable, the performance is superior, the structure layers are mutually bonded as a whole, the axial load inside and outside the pipeline is completely borne by the tensile layer, and the phenomenon of delamination and collapse of the pipeline after the pipeline bears excessive axial load is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of composite pipe technology, specifically relating to a tensile composite pipe for vertical shafts. Background Technology

[0002] Pipeline systems, as the best carriers for media transmission, play a vital role in transportation under various operating conditions. With the development of oil and gas extraction, underground energy storage, and deep geological exploration, it is unavoidable to lay pipelines of various functions in vertical shafts that can reach depths of hundreds or even thousands of meters. In addition to pipelines for domestic use such as water supply, drainage, power supply, and gas supply, many working pipelines are often required. The selection and installation of these working pipelines are often fraught with difficulties.

[0003] The reliability requirements for working pipelines within vertical shafts are very high, especially regarding pressure resistance and corrosion resistance. For most mining companies, working pipelines often need to simultaneously meet requirements for wear resistance, corrosion resistance, pressure resistance, and ease of installation. However, limited by current technology, these requirements are often compromised, with most companies using steel pipelines to initially meet basic pressure transport capacity and maintain production. Compensation for wear and corrosion resistance is then made through frequent pipeline replacements, representing a fundamental flaw in the pipeline system. If the transported medium demands extremely high wear and corrosion resistance, then even more expensive high-performance steel pipelines, such as stainless steel, bimetallic steel, or even duplex stainless steel or titanium steel, must be used. This represents a significant expense for the company's initial mining investment. Therefore, improvements are necessary to address these issues. Utility Model Content

[0004] The technical problem solved by this utility model is to provide a tensile composite pipe for vertical shafts. Utilizing a complementary performance design principle, it employs a layered design comprising an inner lining, a reinforcing layer, an optimized tensile layer, and an outer protective layer, forming a high-performance wear-resistant, corrosion-resistant, pressure-bearing, and tensile-resistant composite pipe. This maximizes the axial tensile strength of the materials, preventing the pipe from breaking during vertical hoisting and installation. It boasts high tensile strength and more stable performance, significantly reducing pipeline investment costs and minimizing subsequent maintenance costs due to frequent pipe replacements. The tensile composite pipe has a stable structural layer and superior performance. The layers are bonded together as a whole, with the tensile layer fully bearing the axial loads inside and outside the pipe. This prevents delamination and collapse due to excessive axial loads inside the pipe, resulting in higher reliability. While meeting the tensile requirements for use in vertical shafts, it also makes the pipe lighter, reduces raw material consumption, lowers costs, and increases market economic benefits.

[0005] The technical solution adopted in this utility model is: a tensile composite pipe for vertical shafts, comprising an inner lining layer, a reinforcing layer, a tensile layer, and an outer protective layer arranged from the inside out. The reinforcing layer is tightly wound around the outer wall of the inner lining layer in a multi-layer cross manner along the axial direction of the inner lining layer. The tensile layer is used to provide axial tensile strength for the vertically hoisted pipe body. The tensile layer is arranged with adjacent layers symmetrically distributed at a winding angle within the range of 10° to 65° and tightly wound around the outer wall of the reinforcing layer in a multi-layer variable angle manner. The outer protective layer is wrapped and fixed to the outside of the tensile layer.

[0006] The inner lining layer is made of any one of HDPE, PERT, PA, PVDF, PEX, or UHMWPE.

[0007] Furthermore, the outer protective layer is made of any one of HDPE, PERT, PA, PVDF, PEX, UHMWPE, or double-resistant polyethylene materials.

[0008] Furthermore, the reinforcing layer is one of polyester prepreg tape, aramid prepreg tape, steel cord prepreg tape, or carbon fiber prepreg tape.

[0009] Furthermore, the number of winding layers of the reinforcing layer is determined according to the pressure-bearing requirements.

[0010] Furthermore, the tensile layer has a length of L from the wellhead or the beginning of the pipe to the bottom of the well or the end of the pipe. The tensile layer is divided into the following sections from the wellhead or the beginning of the pipe to the bottom of the well or the end of the pipe: a tensile section of 0 to 0.2L, a tensile and pressure-bearing section of 0.2L to 0.8L, and a pressure-bearing section of 0.8L to L. The winding angles of adjacent layers in the tensile section are symmetrically distributed in the range of 10° to 25°. The winding angles of adjacent layers in the tensile and pressure-bearing section are symmetrically distributed in the range of 25° to 45°. The winding angles of adjacent layers in the pressure-bearing section are symmetrically distributed in the range of 45° to 65°.

[0011] Furthermore, the tensile layer is a high-strength prepreg tape made of steel strip or a composite of multiple materials.

[0012] Furthermore, the inner liner is also provided with a wear-resistant layer for contacting the medium inside the pipe. The wear-resistant layer is made of a modified thermoplastic elastomer material, and the inner liner and the wear-resistant layer are extruded by a co-extrusion process.

[0013] Advantages of this utility model compared to the prior art: 1. This technical solution adopts the design principle of complementary performance, and uses a layered design including an inner lining layer, a reinforcing layer, an optimized tensile layer and an outer protective layer to form a high-performance wear-resistant, corrosion-resistant, pressure-bearing and tensile-resistant composite pipe. This significantly reduces pipeline investment costs and reduces the later maintenance costs caused by frequent pipeline replacements. The tensile composite pipe has a stable structure and superior performance. The structural layers are bonded together as a whole, and the tensile layer fully bears the axial load inside and outside the pipeline, avoiding delamination and collapse after the pipeline is subjected to excessive axial load, thus enhancing reliability. 2. Based on the characteristics of use in vertical pipe shafts, this technical solution designs and optimizes the tensile layer by using a variable-angle winding method to maximize the axial tensile strength of the material, preventing the pipe from being torn apart during vertical hoisting and installation. It has high tensile strength and more stable performance, meeting the tensile requirements in vertical shafts while making the pipe lighter, reducing raw material consumption, lowering costs, and increasing market economic benefits. 3. Based on the requirements of the medium for the wear resistance of the pipeline, this technical solution takes into account the performance advantages of the tensile composite pipe for vertical shafts, and at the same time, by setting a wear-resistant layer integrally formed with the inner lining through a co-extrusion process, it has good wear resistance, which can meet the needs of different fields and expand the scope of application. 4. The tensile composite pipe of this technical solution has a certain degree of flexibility, which can be supplied in coils, so that the length of a single tensile composite pipe can reach hundreds of meters, greatly reducing the number of pipe joints, increasing pipeline installation efficiency, and eliminating the need for repeated back-and-forth transportation of pipes as in traditional technology. This also results in higher construction efficiency for a single pipe and significantly reduced installation costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0015] The following will be based on the embodiments of this utility model. Figure 1 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0016] It should be noted that, unless otherwise stated herein, the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] In this document, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0018] Tensile composite pipes for vertical shafts, such as Figure 1 As shown, it includes an inner lining layer 1, a reinforcing layer 2, a tensile layer 3, and an outer protective layer 4 arranged from the inside out. The reinforcing layer 2 is tightly wound around the outer wall of the inner lining layer 1 in a multi-layered, interlocking manner along the axial direction of the inner lining layer 1, as shown. Figure 1 As shown, the reinforcing layer 2 has an even number of layers. The tensile layer 3 is used to provide axial tensile strength for the vertically hoisted pipe. The tensile layer 3 is wrapped tightly on the outer wall of the reinforcing layer 2 in multiple layers with symmetrically distributed winding angles between adjacent layers in the range of 10° to 65° and in a variable angle manner. The outer protective layer 4 is wrapped and fixed to the outside of the tensile layer 3. The inner lining 1 is mainly used for transmitting the medium, and plays the role of contacting the medium and sealing the internal medium. It is made of any one of the materials HDPE, PERT, PA, PVDF, PEX, and UHMWPE. For acidic media, the use of non-metallic inner lining 1 can effectively prevent acid corrosion between the internal medium and the pipeline. The outer protective layer 4 is typically made of any one of the following materials: HDPE, PERT, PA, PVDF, PEX, UHMWPE, or other thermoplastic resins. It is mainly used to protect the pipe body and prevent the tensile composite pipe from being damaged by impacts and friction during transportation and installation. If there is a need for flame retardancy and antistatic properties in the tensile composite pipe, double-resistant polyethylene material (i.e., polyethylene with flame retardant and antistatic functions, commonly known as double-resistant polyethylene material) can also be used to meet the requirements. The number of winding layers of the reinforcing layer 2 is usually determined according to the pressure requirements. The reinforcing layer 2 can be one of polyester prepreg tape, aramid prepreg tape, steel cord prepreg tape or carbon fiber prepreg tape. This layer is mainly used for pressure bearing. The reinforcing layer 2, which is formed in a multi-layer cross manner, has strong pressure bearing capacity and high reliability. The tensile layer 3 is mainly used to provide axial tensile strength to the pipe body, preventing the pipe body from being torn apart during vertical hoisting and installation. The tensile layer 3 is a high-strength prepreg tape made of steel strip or a composite of multiple materials. Among them, the high-strength prepreg tape made of multiple materials is a prepreg tape made of materials with high tensile strength such as steel cord, steel wire rope, aramid fiber, and carbon fiber, and processed with PE material through a plastic coating process. This kind of prepreg tape has higher tensile strength, more stable performance, and is more stable and reliable in vertical shaft working conditions. The tensile layer 3 is mostly made of high-strength prepreg tape, and some materials that cannot be made into prepreg tape, such as steel strip, are also used. The tensile layer 3 in the form of prepreg tape will be bonded to the adjacent structural layers as a whole after fusion. The steel strip, which cannot be made into prepreg tape, will also be bonded to the other structural layers through an adhesive coating process in the subsequent production process. After the tensile layer 3 is bonded to the other structural layers by the adhesive process, there will be no delamination between the structural layers. This integrated structure allows the tensile layer 3 to fully bear the load when the medium is transported inside the tensile composite pipe, and there will be no delamination or collapse.

[0019] Tensile layer 3 is the most critical structural layer in the downhole tensile composite pipe. The winding of tensile layer 3 employs a variable-angle winding method to maximize the axial tensile strength of the material. When a pipe runs vertically, the internal load changes in stages. Starting from the wellhead or the beginning of the pipe, the initial section (tensile section) bears a larger load, primarily axial tensile load. This requires stronger axial tensile strength to offset the load; therefore, the winding angle of tensile layer 3 in the tensile section is smaller, providing greater axial tensile strength. In the middle section of the pipe (tensile and pressure-bearing section), the axial tensile load gradually decreases, while the radial pressure gradually increases. Therefore, this section needs to balance the axial tensile strength and radial pressure resistance, requiring an appropriate increase in the winding angle. At the end of the pipe (pressure-bearing section), the radial pressure is greater while the axial tensile force is smaller. Therefore, this section needs to provide additional pressure resistance, employing a larger-angle winding method. Therefore, the winding angles are specifically determined according to the distribution stages of the pipeline within the vertical shaft as follows: The length of the tensile layer 3 from the wellhead or the beginning of the pipe body to the bottom of the well or the end of the pipe body is L, and the tensile layer 3 is divided into the following sections from the wellhead or the beginning of the pipe body to the bottom of the well or the end of the pipe body: a tensile section of 0 to 0.2L, a tensile and pressure-bearing section of 0.2L to 0.8L, and a pressure-bearing section of 0.8L to L. The winding angles of adjacent layers in the tensile section are symmetrically distributed within the range of 10° to 25°, the winding angles of adjacent layers in the tensile and pressure-bearing section are symmetrically distributed within the range of 25° to 45°, and the winding angles of adjacent layers in the pressure-bearing section are symmetrically distributed within the range of 45° to 65°. Using a variable-angle winding method can achieve the desired results with a better technical solution, resulting in lighter pipelines, reduced raw material consumption, lower costs, and higher market economic benefits. The modified thermoplastic elastomer material is POE or TPU. Figure 1 As shown, the tensile layer 3 is set with two tightly wound layers in a variable angle manner. Taking the tensile section as an example, the winding angle of the first layer is 10° to 25°, and the winding angle of the second layer is -10° to -25°. The angle changes of the other two sections are the same as those of the tensile section.

[0020] Some mining companies have certain requirements for the wear resistance of pipelines. Therefore, the inner lining layer 1 is also provided with a wear-resistant layer for contact with the medium inside the pipe. The wear-resistant layer is made of modified thermoplastic elastomer material, and the inner lining layer 1 and the wear-resistant layer are extruded by co-extrusion process. While taking into account the physical and chemical properties of the tensile composite pipe for vertical shafts, it has good wear resistance and a wider range of applications.

[0021] This technical solution adopts a complementary performance design principle, using a layered design comprising an inner lining layer 1, a reinforcing layer 2, an optimized tensile layer 3, and an outer protective layer 4 to form a high-performance wear-resistant, corrosion-resistant, pressure-bearing, and tensile-resistant composite pipe. This significantly reduces pipeline investment costs and minimizes subsequent maintenance costs caused by frequent pipe replacements. The tensile composite pipe has a stable structure and superior performance. The layers are bonded together as a whole, with the tensile layer 3 fully bearing the axial loads inside and outside the pipe, preventing delamination and collapse under excessive axial loads, thus enhancing reliability. Based on the specific characteristics of use in vertical pipe shafts, the tensile layer 3 is designed and optimized using a variable-angle winding method to maximize the axial tensile strength of the material, preventing problems during vertical pipe lifting. During installation, the pipe body is torn apart, resulting in high tensile strength and more stable performance. This meets the tensile strength requirements for use in vertical shafts while making the pipeline lighter, reducing raw material consumption, lowering costs, and increasing market economic benefits. Furthermore, based on the media's requirements for pipe wear resistance, and while maintaining the performance advantages of tensile composite pipes for vertical shafts, a wear-resistant layer integrally formed with the inner lining layer 1 through a co-extrusion process is incorporated, giving it excellent wear resistance and meeting the needs of different fields, thus expanding its application range. The tensile composite pipe itself has a certain degree of flexibility, allowing for coiled supply, enabling single-piece lengths to reach hundreds of meters. This significantly reduces the number of pipe joints, increases pipeline installation efficiency, and eliminates the need for repeated back-and-forth pipe transportation as in traditional techniques, resulting in higher single-piece construction efficiency and significantly reduced installation costs.

[0022] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0023] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A tensile composite pipe for vertical shafts, characterized in that: The structure includes an inner lining layer (1), a reinforcing layer (2), a tensile layer (3), and an outer protective layer (4) arranged from the inside out. The reinforcing layer (2) is tightly wound around the outer wall of the inner lining layer (1) in a multi-layer cross manner along the axial direction of the inner lining layer (1). The tensile layer (3) is used to provide axial tensile strength for the vertically hoisted pipe body. The tensile layer (3) is symmetrically distributed between adjacent layers with winding angles in the range of 10° to 65° and is tightly wound around the outer wall of the reinforcing layer (2) in a multi-layer variable angle manner. The outer protective layer (4) is wrapped and fixed to the outside of the tensile layer (3). The tensile layer (3) is set with two tightly wound layers in a variable angle manner. Taking the tensile section as an example, the winding angle of the first layer is 10° to 25°, and the winding angle of the second layer is -10° to -25°. The angle changes of the other two sections are the same as those of the tensile section. The inner liner (1) is also provided with a wear-resistant layer for contacting the medium inside the pipe. The wear-resistant layer is made of modified thermoplastic elastomer material, and the inner liner (1) and the wear-resistant layer are extruded by co-extrusion process. The modified thermoplastic elastomer material is POE or TPU.

2. The tensile composite pipe for vertical shafts according to claim 1, characterized in that: The inner lining (1) is made of any one of HDPE, PERT, PA, PVDF, PEX, or UHMWPE.

3. The tensile composite pipe for vertical shafts according to claim 1, characterized in that: The outer protective layer (4) is made of any one of HDPE, PERT, PA, PVDF, PEX, UHMWPE, or double-resistant polyethylene.

4. The tensile composite pipe for vertical shafts according to claim 1, characterized in that: The reinforcing layer (2) is made of one of polyester prepreg tape, aramid prepreg tape, steel cord prepreg tape or carbon fiber prepreg tape.

5. The tensile composite pipe for vertical shafts according to claim 1, characterized in that: The number of winding layers of the reinforcing layer (2) is determined according to the pressure bearing requirements.

6. The tensile composite pipe for vertical shafts according to claim 1, characterized in that: The tensile layer (3) has a length of L from the wellhead or the beginning of the pipe to the bottom of the well or the end of the pipe. The tensile layer (3) is divided into the following sections from the wellhead or the beginning of the pipe to the bottom of the well or the end of the pipe: a tensile section of 0 to 0.2L, a tensile and pressure-bearing section of 0.2L to 0.8L, and a pressure-bearing section of 0.8L to L. The winding angles of two adjacent layers of the tensile section are symmetrically distributed in the range of 10° to 25°. The winding angles of two adjacent layers of the tensile and pressure-bearing section are symmetrically distributed in the range of 25° to 45°. The winding angles of two adjacent layers of the pressure-bearing section are symmetrically distributed in the range of 45° to 65°.

7. The tensile composite pipe for vertical shafts according to claim 1, characterized in that: The tensile layer (3) is a high-strength prepreg made of steel strip or a composite of multiple materials.

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