Continuous pipeline

Abstract

The invention provides a continuous pipeline and relates to the technical field of continuous pipelines, the continuous pipeline comprises a high-temperature-resistant pipeline body, the deformation critical value of the pipeline body in a high-temperature environment is 300 DEG C, and the pipeline body is provided with a lining layer, a compression-resistant layer, an intelligent layer, a metal framework layer, a tensile layer and a protective layer which are sequentially connected in a sleeved mode from inside to outside. The pressure-resistant pipeline comprises a pipeline body and a pressure-resistant layer, the pressure-resistant layer comprises a fiber lamination layer and a three-dimensional sewing structure, the fiber lamination layer is spirally wound in the axial direction of the pipeline body, and the three-dimensional sewing structure is configured to sew the structure of the fiber lamination layer in the thickness direction. The metal framework layer is arranged, so that the continuous pipeline has higher high-temperature resistance, bending fatigue resistance and high-pressure resistance, the problems that the continuous pipeline is not resistant to high temperature and high pressure and poor in bending fatigue resistance are solved, and therefore the continuous pipeline can work in a deeper stratum and has longer service life.

Description

Technical Field

[0001] The present application relates to the technical field of continuous pipelines, and in particular to a continuous pipeline. Background Art

[0002] Continuous pipes used in downhole operations, also known as coiled tubing, are continuous pipes without joints, usually wound on a drum and used in various downhole operations such as well repair, drilling, completion, and oil well maintenance. Their flexibility and continuity make coiled tubing more advantageous than traditional pipes with joints in many applications.

[0003] At present, traditional steel continuous oil pipes have weak fatigue and corrosion resistance and low service life. This problem has become a bottleneck for safe and efficient production of oil and gas fields. Composite materials have significant corrosion resistance and can effectively resist the erosion of acidic media. Therefore, the fatigue life of continuous oil pipes made of composite materials is significantly improved, reducing the cost and risk of frequent replacement of oil pipes. In addition, composite materials have the performance advantages of light weight, high toughness and smooth surface. Strength and rigidity can be designed according to usage requirements. Therefore, composite materials are an important choice for continuous oil pipe materials.

[0004] However, the current composite continuous oil pipe is not suitable for deep-earth high-temperature and high-pressure environments and has low bending fatigue resistance. Therefore, composite continuous oil pipes have technical problems such as not being resistant to high temperature and high pressure and having poor bending fatigue resistance. Summary of the invention

[0005] The present application provides a continuous pipeline with higher resistance to high temperature and high pressure, suitable for deep underground high temperature and high pressure working environment, and with higher resistance to bending fatigue.

[0006] In order to achieve the above objectives, this application adopts the following technical solutions:

[0007] The present application embodiment provides a continuous pipeline, comprising:

[0008] A pipe body that can withstand high temperatures, wherein the critical value of deformation of the pipe body under high temperature conditions is 300°C;

[0009] The pipeline body comprises an inner lining layer, a pressure-resistant layer, an intelligent layer, a metal skeleton layer, a tensile layer and a protective layer which are sequentially sleeved from the inside to the outside;

[0010] The pressure-resistant layer includes a fiber stack and a three-dimensional stitching structure. The fiber stack is spirally wound on the inner lining layer along the axial direction of the pipe body. The three-dimensional stitching structure is configured to stitch the structure of the fiber stack in the thickness direction.

[0011] In some embodiments, the pipe body includes at least polyetheretherketone and polyimide.

[0012] In some embodiments, in the pipe body, the mass ratio of polyetheretherketone to polyimide is 99:1-85:15; and / or,

[0013] The thickness of the lining layer is 4mm-8mm.

[0014] In some embodiments, along the radial direction of the pipe body from inside to outside, the fiber stack includes at least two fiber layers, each of the fiber layers is spirally wound along the axial direction of the pipe body, and the winding angles between two adjacent fiber layers and the radial direction of the pipe body are different.

[0015] In some embodiments, the fiber stack includes 10 fiber layers stacked from the inside to the outside, and the winding angles of the 10 fiber layers are 15°, -15°, 20°, -20°, 25°, -25°, 30°, -30°, 35°, and -35° from the inside to the outside.

[0016] In some embodiments, the three-dimensional sutured structure is arranged within a range of 0-60° in the circumferential direction of the fiber stack, and the three-dimensional sutured structure has a plurality of sutured portions arranged in an array, and the plurality of sutured portions are configured to sew the stacking direction of the stacking structure.

[0017] In some embodiments, the row spacing of adjacent stitching parts is 2mm-4mm, and the column spacing is 4mm-6mm; and / or,

[0018] The thickness of the pressure-resistant layer is 5 mm to 8 mm; and / or,

[0019] The fiber layer is a carbon fiber layer.

[0020] In some embodiments, the pressure-resistant layer also includes a first base layer, which is arranged between the smart layer and the fiber laminate, and the first base layer includes at least polyetheretherketone and polyimide, and the mass ratio of the polyetheretherketone and the polyimide in the first base layer is 99:1-85:15.

[0021] In some embodiments, the smart layer includes a second base layer and an optical fiber sensor, and along the axial direction of the second base layer, the optical fiber sensor is spirally wound in the second base layer.

[0022] In some embodiments, the winding angle between each of the optical fiber sensors and the radial direction of the second substrate is 60-75°; and / or,

[0023] The second substrate layer comprises at least polyetheretherketone and polyimide, and the mass ratio of the polyetheretherketone to the polyimide in the second substrate layer is 99:1-85:15; and / or,

[0024] The difference between the thickness of the smart layer and the diameter of the optical fiber sensor is 3 mm to 5 mm; and / or,

[0025] The optical fiber sensor includes at least one of a distributed temperature sensor, a distributed acoustic wave sensor, and a distributed strain sensor.

[0026] In some embodiments, the metal skeleton layer is spirally wound on the smart layer along the axial direction of the smart layer.

[0027] In some embodiments, the pitch of the metal skeleton layer is 5 mm-8 mm, and the thickness of the metal skeleton layer is 4 mm-5 mm.

[0028] In some embodiments, the tensile layer includes a third base layer and a fiber mixed layer, and the fiber mixed layer is arranged around the outer peripheral surface of the third base layer; wherein the third base layer includes at least polyetheretherketone and polyimide, and the mass ratio of the polyetheretherketone and the polyimide in the third base layer is 99:1-85:15.

[0029] In some embodiments, the fiber mixed layer includes a first fiber structure and a second fiber structure, the first fiber structure and the second fiber structure together form an annular structure arranged around the outer peripheral surface of the third matrix layer, the second fiber structure is located within a range of 0-80° in the circumferential direction of the third matrix layer, and the projection of the second fiber structure on the fiber stack covers the fiber stack; and / or,

[0030] The thickness of the tensile layer is 5mm-8mm; and / or,

[0031] The protective layer comprises at least polyetheretherketone and polyimide, and the mass ratio of the polyetheretherketone to the polyimide in the protective layer is 99:1-85:15; and / or,

[0032] The thickness of the protective layer is 5mm-8mm.

[0033] In some embodiments, when the fiber mixed layer includes a first fiber structure and a second fiber structure, the first fiber structure includes a plurality of carbon fiber filaments, each of the carbon fiber filaments extends along the axial direction of the third matrix layer, and the plurality of carbon fiber filaments are sequentially arranged along the circumferential direction of the third matrix layer;

[0034] The second fiber structure includes a plurality of Kevlar fiber filaments, each of the Kevlar fiber filaments extends along the axial direction of the third base layer, and the plurality of Kevlar fiber filaments are sequentially arranged along the circumferential direction of the third base layer.

[0035] The continuous pipeline provided in the embodiment of the present application includes a pipeline body that can withstand high temperatures. The critical deformation value of the pipeline body in a high temperature environment is 300°C. The pipeline body has an inner lining layer, a pressure-resistant layer, an intelligent layer, a metal skeleton layer, a tensile layer and a protective layer that are sequentially sleeved from the inside to the outside. The pressure-resistant layer includes a fiber stack and a three-dimensional stitching structure. The fiber stack is spirally wound along the axial direction of the pipeline body. The three-dimensional stitching structure is configured to stitch the structure in the thickness direction of the fiber stack. By setting a pipeline body that can withstand high temperatures, the continuous pipeline has higher high temperature resistance. The fiber stack and the three-dimensional stitching structure are set in the pressure-resistant layer to enhance the internal pressure resistance and bending fatigue resistance of the pipeline body. In addition, the setting of the metal skeleton layer can enhance the external pressure resistance of the pipeline body, so that the pipeline body can withstand higher pressure and has high stability in a high-pressure environment, thereby solving the problems of the continuous pipeline's inability to withstand high temperature and high pressure and low bending fatigue resistance, so that the continuous pipeline can operate in deeper formations and has a longer service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 A schematic diagram of the structure of a continuous pipeline provided in an embodiment of the present application;

[0038] Figure 2 A schematic diagram of a structure in which a continuous pipe is wound on a drum provided in an embodiment of the present application;

[0039] Figure 3 for Figure 1 A schematic diagram of a cross-sectional structure of a continuous pipeline is provided.

[0040] Description of reference numerals:

[0041] 10- pipe body; 20- roller;

[0042] 100- lining layer; 200- compression layer; 300- intelligent layer; 400- metal skeleton layer; 500- tensile layer; 600- protective layer; 210- three-dimensional suture structure;

[0043] α-3D suture structure setting range;

[0044] β-second fiber structure setting range. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0046] Continuous pipes used in downhole operations, also known as coiled tubing, are continuous pipes without joints, usually wound on a drum and used in various downhole operations such as well repair, drilling, completion, and oil well maintenance. Their flexibility and continuity make coiled tubing more advantageous than traditional pipes with joints in many applications.

[0047] At present, the fatigue and corrosion resistance of traditional steel continuous oil pipes are weak, and the service life is short. This problem has become a bottleneck for the safe and efficient production of oil and gas fields. Composite materials have significant corrosion resistance and can effectively resist the erosion of acidic media. Therefore, the fatigue life of continuous oil pipes made of composite materials is significantly improved, reducing the cost and risk of frequent replacement of oil pipes. In addition, composite materials have the performance advantages of light weight, high toughness and smooth surface. Strength and rigidity can be designed according to usage requirements. Therefore, composite materials are an important choice of continuous oil pipe materials.

[0048] However, the current composite continuous oil pipe is not suitable for the high temperature and high pressure environment in deep formations due to its insufficient structure and material properties. It is usually operated in wells within 3,000 meters. The continuous oil pipe has internal pressure during the preparation operation on the well and the downhole operation, which is referred to as internal pressure. Therefore, in the process of winding the continuous oil pipe on the drum or removing it from the drum to the well, the continuous oil pipe bearing the internal pressure will experience multiple bending and straightening, and the internal stress of the pipeline will be superimposed, which is prone to bending fatigue damage. Therefore, the continuous oil pipe needs to have strong resistance to bending fatigue. Therefore, in the related technology, the composite continuous oil pipe has the technical problems of not being resistant to high temperature and high pressure and having low resistance to bending fatigue.

[0049] Furthermore, in some embodiments, the composite coiled tubing has a technical problem of imperfect real-time monitoring and transmission of the composite coiled tubing's status and downhole data in a high-temperature and high-pressure environment deep underground.

[0050] In view of the above problems, an embodiment of the present application provides a continuous pipeline. The contents of the present application will be described in detail below in conjunction with the accompanying drawings so that those skilled in the art can understand the contents of the present application more clearly and in detail.

[0051] like Figure 1As shown, the continuous pipeline provided in the embodiment of the present application includes a pipeline body that can withstand high temperatures, the deformation critical value of the pipeline body in a high temperature environment is 300°C, the pipeline body has an inner lining layer 100, a pressure-resistant layer 200, an intelligent layer 300, a metal skeleton layer 400, a tensile layer 500 and a protective layer 600 that are sequentially sleeved from the inside to the outside, wherein the pressure-resistant layer 200 includes a fiber stack and a three-dimensional stitching structure 210, the fiber stack is spirally wound along the axial direction of the pipeline body, and the three-dimensional stitching structure 210 is configured to stitch the structure in the thickness direction of the fiber stack; the continuous pipeline adopts a pipeline body that can withstand high temperatures, which can effectively enhance the continuous pipeline. The high temperature resistance of the pipeline makes the continuous pipeline highly stable in a high temperature environment and can effectively resist thermal fatigue failure caused by repeated temperature changes. In addition, the continuous pipeline is provided with a fiber laminate and a three-dimensional sutured structure 210 in the pressure-resistant layer 200, which can enhance the internal pressure resistance and bending fatigue resistance of the pipeline body. In addition, the provision of the metal skeleton layer 400 can enhance the external pressure resistance of the pipeline body, making the continuous pipeline highly stable in a high pressure environment. Therefore, the continuous pipeline has higher resistance to high temperature, high pressure and bending fatigue, so that the continuous pipeline can operate in deeper formations and has a longer service life.

[0052] In some embodiments, the pipeline body includes at least polyetheretherketone and polyimide. Both polyetheretherketone and polyimide have the characteristics of high temperature resistance, high mechanical strength, chemical corrosion resistance, wear resistance, etc. As the material of the pipeline body, it can effectively resist the high temperature, high pressure and corrosive working environment in deeper formations, so that the continuous pipeline has higher resistance to high temperature and high pressure. In terms of high temperature resistance, the pipeline body 10 including polyetheretherketone and polyimide can work stably at a temperature of 250°C, and can meet the high temperature resistance requirements in wells within 8,000 meters.

[0053] In some embodiments, the pipe body only includes polyetheretherketone or polyimide. Polyimide has higher high temperature resistance than polyetheretherketone, but polyimide has a higher price. Therefore, the pipe body having polyetheretherketone and polyimide has higher high temperature resistance than the polyetheretherketone pipe body and has lower cost than the polyimide pipe body.

[0054] In some embodiments, the inner lining layer 100 in the pipe body includes at least polyetheretherketone and polyimide, which can resist the erosion of the pipe by corrosive media in the fluid in the continuous pipe, such as acid, alkali, salt or other chemicals, so as to ensure the stability of the continuous oil pipe. The inner lining layer 100 including polyetheretherketone and polyimide has a smooth inner surface, which can reduce the flow resistance of the fluid in the pipe, thereby improving the transmission efficiency and reducing energy consumption. In addition, the inner lining layer 100, as the innermost layer in the pipe body of the continuous pipe, has a sealing effect, which helps to prevent the high-pressure fluid from leaking to other layers during the downhole operation of the continuous pipe, thereby improving the overall safety and stability of the continuous pipe.

[0055] In some embodiments, in the pipe body, the mass ratio of polyetheretherketone and polyimide is 99:1-85:15. Exemplarily, the mass ratio of polyetheretherketone and polyimide is 99:1, 98:2, 98:3, 96:4, 95:5, 94:6, 93:7, 92:8, 91:9, 90:10, 89:11, 88:12, 87:13, 86:14, 85:15, etc. The increase of polyimide is beneficial to improving the high temperature resistance of the pipe body, but the mixing of too much polyimide affects the miscibility of polyetheretherketone and polyimide, thereby deteriorating the integrity of the pipe. Therefore, it is necessary to select polyetheretherketone and polyimide with an appropriate mass ratio.

[0056] In some embodiments, the thickness of the lining layer 100 is 4mm-8mm. Exemplarily, the thickness of the lining layer 100 is 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, etc. As the thickness increases, the pressure resistance and wear resistance of the lining layer 100 increase, and it has higher stability and resistance to high temperature and high pressure. Therefore, the thickness of the lining layer 100 can be selected according to the temperature and pressure corresponding to the depth of the formation where the pipeline body needs to operate. In addition, the lining layer 100 includes polyetheretherketone and polyimide, and the mass ratio of polyetheretherketone and polyimide is 99:1-85:15.

[0057] The pressure-resistant layer 200 includes a fiber stack and a three-dimensional stitching structure 210, wherein, from inside to outside along the radial direction of the pipeline body, the fiber stack includes at least two fiber layers, each fiber layer is spirally wound along the axial direction of the pipeline body, and the winding angles between the two adjacent fiber layers and the radial direction of the pipeline body are different. In some embodiments, the arrangement of the fiber layer in the pressure-resistant layer 200 is conducive to strengthening the internal pressure resistance of the lining layer 100, so that the pipeline body can resist the fluid pressure in the pipeline, and avoid the pipeline body from causing the rupture of the lining layer 100 and fluid leakage due to excessive or changing internal pressure, thereby increasing the service life of the pipeline body. In addition, the fiber stack includes at least two fiber layers, each fiber layer is spirally wound along the axial direction of the pipeline body, which is conducive to making each fiber layer more adaptable to the deformation displacement caused by the axial force of the pipeline body, so that each fiber layer can withstand greater pressure without breaking, and each fiber layer is wound at different angles with the radial direction of the pipeline body, so that each fiber layer can withstand pressure loads in all directions, thereby increasing the internal pressure resistance of the fiber stack.

[0058] Specifically, the fiber stack includes 10 fiber layers stacked from the inside to the outside, and the winding angles of the 10 fiber layers are 15°, -15°, 20°, -20°, 25°, -25°, 30°, -30°, 35°, and -35° from the inside to the outside. The fiber stack mainly resists the circumferential stress distributed along the circumference of the fiber stack caused by the internal pressure of the pipeline, and the circumferential stress gradually decreases from the inside to the outside along the wall thickness direction of the fiber stack. Therefore, the winding angle between the fiber layer and the circumference of the pipeline body is set to a value adapted to the circumferential stress gradient along the wall thickness direction of the fiber stack, that is, the winding angle between the fiber layer and the circumference of the pipeline body gradually increases from the inner layer to the outer layer, thereby improving the internal pressure resistance of the fiber stack, improving the overall pressure resistance of the pipeline body, and increasing the service life of the pipeline body.

[0059] In some embodiments, the number of fiber layers in the fiber stack can be 10 layers or less, for example: 10, 9, 8, 7, 6 layers, etc. Too many fiber layers will increase the risk of stratification between the fiber layers, and weaken the compressive resistance of the fiber stack. Too few fiber layers will reduce the compressive resistance of the pressure-resistant layer 200. Therefore, exemplarily, the number of fiber layers in the fiber stack is not less than 6 layers. The specific number of fiber layers needs to be selected according to the operating depth of the pipeline body in the formation and the internal pressure it needs to withstand. The deeper the operating depth of the pipeline body in the formation or the greater the internal pressure of the pipeline, the more fiber layers are selected.

[0060] In some embodiments, the absolute value of the winding angle between the fiber layer and the radial direction of the pipe body is not greater than 35°, for example, 5°, -5°, 10°, -10°, 15°, -15°, 20°, -20°, 25°, -25°, 30°, -30°, 35°, -35°, etc. If the winding angle is too large, the ability to withstand circumferential stress will be weakened. If the winding angle is too small, the risk of delamination between fiber layers may increase. Therefore, it is necessary to select the winding angle of the fiber layer according to the operating depth of the pipe body in the formation, the internal pressure that needs to be withstand, and the number of fiber layers, so that the fiber stack can withstand higher pressure.

[0061] In other embodiments, the winding angle between the fiber layer and the radial direction of the pipe body can also be 12°, 18°, 23°, 28°, 33°, etc., or any angle within the range of -35°-35°, but such angle needs to be selected according to the accuracy of the manufacturing process.

[0062] In addition, if Figure 2 and Figure 3 As shown, the three-dimensional suture structure 210 in the pressure-resistant layer 200 is arranged in the range of 0-60° in the circumferential direction of the fiber stacking, for example, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, etc., that is, within the range of α, α is the setting range of the three-dimensional suture structure, and the three-dimensional suture structure 210 has a plurality of suture parts arranged in an array, and the plurality of suture parts are configured to sew the stacking direction of the stacking structure, thereby enhancing the bonding force between the fiber layers constituting the fiber stacking, and preventing stratification between the fiber layers, so that the pipe body can resist higher bending stress, improve the bending fatigue strength of the pipe body 10 at the suture part, increase the service life of the pipe body, and reduce the cost of frequent replacement of the pipe body.

[0063] In some embodiments, Figure 2 As shown, the pipe body needs to be wound around a drum 20 for management during storage, transportation or before operation on the ground, wherein on the pipe body, the farther away from the drum 20, the greater the tensile strength. Therefore, when the pipe body is wound around the drum 20, stratification is most likely to occur at the position of the fiber stack far away from the drum 20. Therefore, a three-dimensional suture structure 210 is provided here, wherein specifically, the midpoint of the α range of the three-dimensional suture structure 210 distribution is located on the fiber stack in the pipe body farthest from the drum 20, so that the portion of the fiber stack having the three-dimensional suture structure 210 can maximize the stress caused by the stretching of the pipe.

[0064] In some embodiments, the row spacing of adjacent stitching parts in the three-dimensional stitching structure 210 is 2 mm-4 mm, and the column spacing is 4 mm-6 mm. Figure 1As shown, along the axial direction of the pressure-resistant layer 200, the spacing between adjacent stitching parts can be 2mm-4mm, for example, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.5mm, 4mm, etc., and along the circumferential direction of the pressure-resistant layer 200, the spacing between adjacent stitching parts can be 4mm-6mm, for example, 4mm, 4.2mm, 4.5mm, 4.8mm, 5mm, 5.5mm, 6mm, etc. It is necessary to select the row spacing and column spacing of the stitching parts according to the operating depth of the pipeline body in the formation, the pressure inside the pipeline body that needs to be borne, and the bending strength of the pipeline body when it is wound on the drum 20, so as to control the stitching density, enhance the bending fatigue strength of the pipeline body and the bonding force between the fiber layers, and reduce the risk of stratification between the fiber layers and damage to the pipeline body.

[0065] In some embodiments, the fiber layer is a carbon fiber layer, which has higher high temperature resistance. In addition, the fiber layer can also be made of glass fiber or Kevlar fiber. The three-dimensional sutured structure 210 can use materials consistent with the fiber layer, such as carbon fiber, glass fiber, Kevlar fiber, etc., so as to better integrate with the fiber layer, thereby enhancing the bonding force between the fiber layers, thereby enhancing the compressive resistance and bending fatigue strength of the pipeline body.

[0066] In some embodiments, the suture method of the three-dimensional suture structure 210 can be a dark line suture method, and the suture direction is along the circumferential direction of the fiber stack to resist the circumferential stress and radial stress brought to the fiber stack by the internal pressure of the pipeline, thereby enhancing the pressure resistance of the pressure-resistant layer 200 and the pipeline body.

[0067] In some embodiments, the thickness of the pressure-resistant layer 200 is 5mm-8mm. Exemplarily, the thickness of the pressure-resistant layer 200 is 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, etc. As the thickness increases, the pressure resistance of the pressure-resistant layer 200 increases, and it has higher stability and pressure resistance. Therefore, the thickness of the pressure-resistant layer 200 can be selected according to the pressure inside the pipeline body.

[0068] In addition, the pressure-resistant layer 200 also includes a first base layer, which is arranged between the smart layer 300 and the fiber stack. The first base layer includes at least polyetheretherketone and polyimide, and the mass ratio of polyetheretherketone and polyimide in the first base layer is 99:1-85:15. The setting of the first base layer is beneficial to filling the gaps formed by the fibers between the fiber stacks, and the fiber stacks can be coated and protected to avoid direct contact between the fiber stack and the smart layer 300, causing damage to the fiber stack or the smart layer 300.

[0069] In some embodiments, the first substrate layer includes at least polyetheretherketone and polyimide, and the mass ratio of polyetheretherketone and polyimide is 99:1-85:15. Exemplarily, the mass ratio of polyetheretherketone and polyimide is 99:1, 98:2, 98:3, 96:4, 95:5, 94:6, 93:7, 92:8, 91:9, 90:10, 89:11, 88:12, 87:13, 86:14, 85:15, etc., wherein the first substrate layer can be consistent with the mass ratio of polyetheretherketone and polyimide in the lining layer 100, so as to better integrate the lining layer 100 and the pressure-resistant layer 200, enhance the integrity of the pipeline, and thereby obtain higher resistance to high temperature and high pressure.

[0070] The intelligent layer 300 of the pipeline body includes a second base layer and an optical fiber sensor. The optical fiber sensor is spirally wound in the second base layer along the axial direction of the second base layer. The setting of the intelligent layer 300 can perform three-dimensional monitoring of the state of the pipeline body and the working environment outside the pipeline, so as to make judgments on whether to perform operations and how to perform operations.

[0071] In some embodiments, Figure 1 As shown, the optical fiber sensors are placed in the second substrate layer in a spirally wound manner along the axial direction of the second substrate layer, which is beneficial for each optical fiber sensor to better adapt to the deformation displacement caused by the axial force of the second substrate layer. In addition, the winding angle between each optical fiber sensor and the radial direction of the second substrate is 60-75°. Exemplarily, the winding angle between each optical fiber sensor and the radial direction of the second substrate is 60°, 62°, 65°, 68°, 70°, 72°, 75°, etc.

[0072] In some embodiments, the second substrate layer includes at least polyetheretherketone and polyimide, and the mass ratio of polyetheretherketone and polyimide in the second substrate layer is 99:1-85:15. Exemplarily, the mass ratio of polyetheretherketone and polyimide is 99:1, 98:2, 98:3, 96:4, 95:5, 94:6, 93:7, 92:8, 91:9, 90:10, 89:11, 88:12, 87:13, 86:14, 85:15, etc., wherein the second substrate layer can be consistent with the mass ratio of polyetheretherketone and polyimide in the first substrate layer and the lining layer 100, so as to better integrate the lining layer 100, the pressure-resistant layer 200 and the smart layer 300, enhance the integrity of the pipeline, and thereby obtain higher resistance to high temperature and high pressure.

[0073] In some embodiments, the optical fiber sensor is spirally wound in the second substrate layer along the axial direction of the second substrate layer. The optical fiber sensor has high temperature resistance and has the advantages of stable transmission, high safety, small size, light weight, and distributed measurement and long-distance real-time monitoring in a high temperature environment. Burying it in the second substrate is beneficial to protecting the optical fiber sensor and avoiding direct contact between the optical fiber sensor and the pressure-resistant layer 200 or the metal skeleton layer 400 to generate friction that affects the transmission performance and pressure resistance of the optical fiber sensor.

[0074] In some embodiments, the difference between the thickness of the smart layer 300 and the diameter of the optical fiber sensor is 3mm-5mm, for example, the difference is 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc., to ensure that the optical fiber sensor can be completely placed in the second substrate layer, avoiding the optical fiber sensor from being exposed outside the smart layer 300, and not significantly increasing the weight and diameter size of the smart layer 300 and the pipeline body.

[0075] The optical fiber sensor includes at least one of a distributed temperature sensor, a distributed acoustic wave sensor, and a distributed strain sensor to improve the collection of information data on the pipeline body and the external environment.

[0076] In some embodiments, the optical fiber sensor includes one of a distributed temperature sensor, a distributed acoustic wave sensor, and a distributed strain sensor to respectively detect information on the temperature, acoustic waves, vibration, pipeline structural deformation, stress concentration distribution, or potential failure location of the pipeline body and the external environment, thereby facilitating the understanding of the conditions of the continuous pipeline and the surrounding environment.

[0077] In some embodiments, the optical fiber sensor includes two of a distributed temperature sensor, a distributed acoustic wave sensor, and a distributed strain sensor. For example, the optical fiber sensor includes a distributed temperature sensor and a distributed acoustic wave sensor, or a distributed temperature sensor and a distributed strain sensor, or a distributed acoustic wave sensor and a distributed strain sensor. Exemplarily, the optical fiber sensor includes a distributed temperature sensor and a distributed strain sensor. The distributed temperature sensor can monitor the temperature change of the pipeline body in a high temperature environment and identify potential cracks or failures of the pipeline body caused by thermal expansion or thermal shock. The distributed strain sensor can monitor the strain caused by the force on the pipeline body and accurately capture the stress caused by temperature change, external load or wellbore deformation. The combination of the distributed temperature sensor and the distributed strain sensor can comprehensively and continuously monitor the health status of the pipeline body in a high temperature and high pressure environment deep underground.

[0078] In some other embodiments, the fiber optic sensor includes a distributed temperature sensor, a distributed acoustic wave sensor, and a distributed strain sensor to detect information such as the temperature, acoustic waves, vibrations, pipeline structure deformation, stress concentration distribution, or potential failure location of the pipeline body and the external environment, thereby improving the acquisition of information data on the pipeline body and the external environment and facilitating a more comprehensive and detailed understanding of the continuous pipeline and the surrounding environmental conditions.

[0079] In some embodiments, the fiber optic sensor is connected to an intelligent diagnosis system. The fiber optic sensor transmits the real-time data of the continuous pipeline state and the real-time data of the external environment where the continuous pipeline is located to the intelligent diagnosis system for operators to monitor. And when the temperature of the pipeline body is abnormal or the strain is too large, the intelligent diagnosis system can give an early warning in time, thereby reducing the occurrence of accidents and ensuring the safe operation during the operation of the pipeline body.

[0080] As Figure 1 shown, the metal skeleton layer 400 of the pipeline body is spirally wound around the intelligent layer 300 along the axial direction of the intelligent layer 300. In some embodiments, the metal skeleton layer 400 can be formed by spirally winding a strip-shaped metal band along the axial direction of the intelligent layer 300 around the intelligent layer 300 to improve the performance of the pipeline body to resist the pressure brought by the working environment, enabling the pipeline body to resist higher pressures. And the metal skeleton layer 400 is spirally wound around the intelligent layer 300, which is beneficial for the metal skeleton layer 400 to better adapt to the deformation displacement generated by the force along the axial direction of the intelligent layer 300, so that the metal skeleton layer 400 can withstand greater pressures or deformations in the formation environment without breaking, thereby enhancing the compressive and anti-bending performance of the pipeline body.

[0081] In some embodiments, the cross-sectional shape of the strip-shaped metal band in the metal skeleton layer 400 can be rectangular to increase the contact area between adjacent metal band loops formed by the spiral winding of the metal band along the axial direction of the pipeline body 10, thereby improving the support strength of the metal skeleton layer 400 along the axial direction of the pipeline body 10.

[0082] Specifically, the pitch of the metal skeleton layer 400 is 5 mm - 8 mm. For example, the pitch is 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, etc. The thickness of the metal skeleton layer 400 is 4 mm - 5 mm. For example, the thickness is 4 mm, 4.2 mm, 4.5 mm, 4.8 mm, 5 mm, etc. The pitch and thickness of the metal skeleton layer 400 can be selected according to the pressure corresponding to the formation depth where the pipeline body needs to operate and the anti-tensile and anti-bending conditions.

[0083] In some embodiments, the material of the metal skeleton layer 400 includes but is not limited to aluminum alloy, 304 stainless steel, 316 stainless steel, carbon steel, titanium alloy, etc., wherein, for example, the metal skeleton layer 400 is made of aluminum alloy, which has a lighter weight while ensuring the compressive, tensile and bending strength, so as to reduce the total weight of the pipeline body.

[0084] The tensile layer 500 of the pipe body includes a third matrix layer and a fiber mixed layer, and the fiber mixed layer is arranged around the outer peripheral surface of the third matrix layer; wherein the third matrix layer includes at least polyetheretherketone and polyimide, and the mass ratio of polyetheretherketone and polyimide in the third matrix layer is 99:1-85:15.

[0085] In some embodiments, in order to avoid direct contact between the fiber mixture layer and the metal skeleton layer 400, a third matrix layer is arranged between the metal skeleton layer 400 and the fiber mixture layer, and together with the fiber mixture layer, it forms a tensile layer 500 to resist the tensile stress generated by repeated bending of the pipeline body during operation and the tensile deformation caused by the weight of the pipeline body itself. While protecting the fiber mixture layer, the third matrix bears the tensile stress together with the fiber mixture layer to disperse the stress load.

[0086] In some embodiments, the third substrate layer includes at least polyetheretherketone and polyimide, and the mass ratio of polyetheretherketone to polyimide in the third substrate layer is 99:1-85:15. Exemplarily, the mass ratio of polyetheretherketone to polyimide is 99:1, 98:2, 98:3, 96:4, 95:5, 94:6, 93:7, 92:8, 91:9, 90:10, 89:11, 88:12, 87:13, 86:14, 85:15, etc., wherein the third substrate layer can be consistent with the mass ratio of polyetheretherketone to polyimide in the second substrate layer, the first substrate layer and the lining layer 100, so as to better integrate the lining layer 100, the pressure-resistant layer 200, the smart layer 300, the metal layer 400 and the tensile layer 500, enhance the integrity of the pipeline, and thereby obtain higher resistance to high temperature, high pressure and tensile strength.

[0087] In other embodiments, the metal layer and the anti-tensile layer 500 can be interchanged, that is, the anti-tensile layer 500 is firstly sleeved on the pipe body from the inside to the outside, and then the metal skeleton layer 400 is sleeved, wherein the third matrix layer is arranged between the mixed fiber layer and the metal skeleton layer 400 to avoid direct contact between the mixed fiber layer and the metal skeleton layer 400.

[0088] The fiber mixing layer includes a first fiber structure and a second fiber structure. The first fiber structure and the second fiber structure together form an annular structure that is arranged around the outer peripheral surface of the third matrix layer. The second fiber structure is located within the range of 0-80° in the circumferential direction of the third matrix layer, and the projection of the second fiber structure on the fiber stack covers the fiber stack.

[0089] In some embodiments, Figure 3 As shown, the second fiber structure can adopt a fiber material with stronger toughness to improve the bending fatigue resistance of the pipe body 10 corresponding to the setting position of the second fiber structure. In addition, the second fiber structure is located in the circumferential range of 0-80° of the third matrix layer. Exemplarily, the second fiber structure is located in the circumferential range of 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, etc. of the third matrix layer, that is, within the range of β, β is the setting range of the second fiber structure, so as to enhance the bending fatigue resistance of the fiber mixed layer within the range of β.

[0090] In some embodiments, Figure 2 and Figure 3 As shown, when the pipe body is wound on the drum 20, the farther the position is from the drum 20, the greater the tensile strain. Therefore, a second fiber structure with stronger toughness can be arranged here. Specifically, the distribution of the second fiber structure in the cross section along the axial direction of the pipe body is within the β range, and the projection of the β range on the fiber stack covers the α range, wherein the midpoint of the β range is located on the third matrix layer in the pipe body farthest from the drum 20, so that the portion with the second fiber structure can maximize the stress and strain caused by repeated stretching of the pipe and have higher bending fatigue strength.

[0091] In some embodiments, the thickness of the tensile layer 500 is 5 mm-8 mm. Exemplarily, the thickness of the tensile layer 500 is 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, etc. The thickness of the tensile layer 500 can be specifically selected according to the tensile resistance and bending fatigue strength required by the pipeline body. When the pipeline body needs to resist higher tensile resistance or bending fatigue strength, the tensile layer 500 needs to be set to a thicker thickness.

[0092] The protective layer 600 of the pipeline body at least includes polyetheretherketone and polyimide, and the mass ratio of polyetheretherketone to polyimide in the protective layer 600 is 99:1-85:15.

[0093] In some embodiments, in order to protect the internal structure of the pipeline body, a protective layer 600 is provided on the outermost layer to resist corrosion in the working environment, reduce friction resistance with the surrounding environment, resist wear and external mechanical impact, thereby ensuring the integrity and stability of the pipeline body.

[0094] In some embodiments, the protective layer includes at least polyetheretherketone and polyimide, and the mass ratio of polyetheretherketone to polyimide in the protective layer is 99:1-85:15. Exemplarily, the mass ratio of polyetheretherketone to polyimide is 99:1, 98:2, 98:3, 96:4, 95:5, 94:6, 93:7, 92:8, 91:9, 90:10, 89:11, 88:12, 87:13, 86:14, 85:15, etc., wherein the protective layer can be consistent with the mass ratio of polyetheretherketone and polyimide in the third substrate layer, the second substrate layer, the first substrate layer and the lining layer 100, so as to better integrate the lining layer 100, the pressure-resistant layer 200, the smart layer 300, the metal layer 400, the tensile layer 500 and the protective layer 600, thereby enhancing the integrity of the pipeline and obtaining higher resistance to high temperature, high pressure and tensile strength.

[0095] The thickness of the protective layer 600 is 5mm-8mm. Exemplarily, the thickness of the protective layer 600 is 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, etc. The thickness of the protective layer 600 can be selected according to the temperature, pressure, and tension corresponding to the depth of the formation where the pipeline body needs to operate.

[0096] In some embodiments, when the fiber mixing layer includes a first fiber structure and a second fiber structure, the first fiber structure includes a plurality of carbon fiber filaments, each carbon fiber filament extends axially along the third matrix layer, and the plurality of carbon fiber filaments are sequentially arranged along the circumferential direction of the third matrix layer; the second fiber structure includes a plurality of Kevlar fiber filaments, each Kevlar fiber filament extends axially along the third matrix layer, and the plurality of Kevlar fiber filaments are sequentially arranged along the circumferential direction of the third matrix layer, and the Kevlar fiber has stronger toughness to improve the bending fatigue resistance of the pipe body 10 at the second fiber structure.

[0097] In some embodiments, the first fiber structure includes but is not limited to carbon fiber filaments, Kevlar fiber filaments, etc., and the second fiber structure includes but is not limited to Kevlar fiber filaments, polyethylene terephthalate fiber filaments, etc. Therefore, the composition of the first fiber structure and the second fiber structure can be selected according to the tensile resistance and bending fatigue strength required by the pipe body, so that the tensile layer 500 can reduce production costs while meeting the tensile requirements.

[0098] It should be noted that the phrases "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include certain features, structures or characteristics, but not every embodiment may include the certain features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing certain features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments, whether explicitly or not explicitly described.

[0099] In general, terms should be understood, at least in part, by the context in which they are used. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, depending, at least in part, on the context. Similarly, terms such as "a," "an," or "the" may also be understood to convey singular usage or to convey plural usage, depending, at least in part, on the context.

[0100] It should be easily understood that the terms “on”, “above” and “over” in this application should be interpreted in the broadest manner, so that “on” not only means “directly on something”, but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” not only includes the meaning of “above” or “over”, but also includes the meaning of “above” or “over” with no intervening features or layers therebetween (i.e., the meaning of directly on something).

[0101] In addition, spatially relative terms, such as "below," "below," "below," "above," "above," etc., may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the figures. The device may have other orientations (rotated 90° or in other orientations, and the spatially relative descriptors used herein may likewise be interpreted accordingly.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A continuous pipeline, characterized in that: The invention comprises a pipe body which can withstand high temperature, wherein the deformation critical value of the pipe body in a high temperature environment is 300°C; The pipeline body comprises an inner lining layer (100), a pressure-resistant layer (200), an intelligent layer (300), a metal skeleton layer (400), a tensile layer (500), and a protective layer (600) which are sequentially sleeved from the inside to the outside; The pressure-resistant layer (200) comprises a fiber stack and a three-dimensional stitching structure (210), wherein the fiber stack is spirally wound on the inner lining layer (100) along the axial direction of the pipe body, and the three-dimensional stitching structure (210) is configured to stitch the structure of the fiber stack in the thickness direction.

2. The continuous pipeline according to claim 1, characterized in that The pipe body at least includes polyetheretherketone and polyimide.

3. The continuous pipeline according to claim 2, characterized in that In the pipe body, the mass ratio of polyetheretherketone to polyimide is 99:1-85:15; and / or, The thickness of the inner lining layer (100) is 4 mm to 8 mm.

4. The continuous pipeline according to any one of claims 1 to 3, characterized in that: From inside to outside along the radial direction of the pipe body, the fiber stack includes at least two fiber layers, each of which is spirally wound along the axial direction of the pipe body, and the winding angles between two adjacent fiber layers and the radial direction of the pipe body are different.

5. The continuous pipeline according to claim 4, characterized in that The fiber stack includes 10 fiber layers stacked sequentially from the inside to the outside, and the winding angles of the 10 fiber layers are 15°, -15°, 20°, -20°, 25°, -25°, 30°, -30°, 35°, and -35° from the inside to the outside.

6. The continuous pipeline according to claim 5, characterized in that The three-dimensional sutured structure (210) is arranged within a range of 0-60° in the circumferential direction of the fiber stack, and the three-dimensional sutured structure (210) has a plurality of sutured portions arranged in an array, and the plurality of sutured portions are configured to sew the stacking direction of the stacking structure.

7. The continuous pipeline according to claim 6, characterized in that The row spacing of adjacent stitching parts is 2mm-4mm, and the column spacing is 4mm-6mm; and / or, The thickness of the pressure-resistant layer (200) is 5 mm to 8 mm; and / or, The fiber layer is a carbon fiber layer.

8. The continuous pipeline according to claim 6, characterized in that The pressure-resistant layer (200) further comprises a first base layer, the first base layer being arranged between the smart layer (300) and the fiber laminate, the first base layer comprising at least polyetheretherketone and polyimide, and the mass ratio of the polyetheretherketone to the polyimide in the first base layer is 99:1-85:

15.

9. The continuous pipeline according to any one of claims 1 to 3, characterized in that: The smart layer (300) comprises a second base layer and an optical fiber sensor; along the axial direction of the second base layer, the optical fiber sensor is spirally wound in the second base layer.

10. The continuous pipeline according to claim 9, characterized in that The winding angle between each of the optical fiber sensors and the second substrate radial direction is 60-75°; and / or, The second substrate layer comprises at least polyetheretherketone and polyimide, and the mass ratio of the polyetheretherketone to the polyimide in the second substrate layer is 99:1-85:15; and / or, The difference between the thickness of the smart layer (300) and the diameter of the optical fiber sensor is 3 mm to 5 mm; and / or, The optical fiber sensor includes at least one of a distributed temperature sensor, a distributed acoustic wave sensor, and a distributed strain sensor.

11. The continuous pipeline according to any one of claims 1 to 3, characterized in that: The metal skeleton layer (400) is spirally wound on the smart layer (300) along the axial direction of the smart layer (300).

12. The continuous pipeline according to claim 11, characterized in that The pitch of the metal skeleton layer (400) is 5 mm to 8 mm, and the thickness of the metal skeleton layer (400) is 4 mm to 5 mm.

13. The continuous pipeline according to any one of claims 1 to 3, characterized in that The tensile layer (500) comprises a third base layer and a fiber mixing layer, wherein the fiber mixing layer is arranged around the outer peripheral surface of the third base layer; wherein the third base layer comprises at least polyetheretherketone and polyimide, and the mass ratio of the polyetheretherketone to the polyimide in the third base layer is 99:1-85:

15.

14. The continuous pipeline according to claim 13, characterized in that The fiber mixed layer includes a first fiber structure and a second fiber structure, the first fiber structure and the second fiber structure together form an annular structure arranged around the outer peripheral surface of the third base layer, and the second fiber structure is located within a range of 0-80° in the circumferential direction of the third base layer, and a projection of the second fiber structure on the fiber stack covers the fiber stack; and / or, The thickness of the tensile layer (500) is 5 mm to 8 mm; and / or, The protective layer (600) comprises at least polyetheretherketone and polyimide, and the mass ratio of the polyetheretherketone to the polyimide in the protective layer (600) is 99:1-85:15; and / or, The thickness of the protective layer (600) is 5 mm to 8 mm.

15. The continuous pipeline according to claim 14, characterized in that When the fiber mixed layer includes a first fiber structure and a second fiber structure, the first fiber structure includes a plurality of carbon fiber filaments, each of the carbon fiber filaments extends along the axial direction of the third matrix layer, and the plurality of carbon fiber filaments are sequentially arranged along the circumferential direction of the third matrix layer; The second fiber structure includes a plurality of Kevlar fiber filaments, each of the Kevlar fiber filaments extends along the axial direction of the third base layer, and the plurality of Kevlar fiber filaments are sequentially arranged along the circumferential direction of the third base layer.

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