Ultrahigh-pressure acid fracturing hose and assembly thereof

Abstract

The utility model discloses an ultrahigh-pressure acid fracturing hose and an assembly thereof, belongs to the technical field of high-pressure hoses, and solves at least one of the problems that the wear resistance and the acid resistance of the conventional acid fracturing hose are reduced, the weight is too heavy and the flexibility is poor due to the fact that a lining layer is not firmly combined with other parts. The ultrahigh-pressure acid fracturing hose comprises a composite lining, an inner rubber layer, a first buffer layer, a framework, a second buffer layer, an outer rubber layer and a protective layer which are sequentially arranged from inside to outside, wherein the composite lining is of a double-layer structure and is composed of a wear-resistant plastic layer and an affinity layer; and the affinity layer is positioned between the wear-resistant plastic layer and the inner rubber layer and is used for enhancing the affinity of the wear-resistant plastic layer and the inner rubber layer. The utility model effectively solves the problem that the wear resistance and the acid resistance of the traditional fracture acidizing hose are reduced due to the fact that the lining layer is not firmly combined with other parts in the practical application, and further reduces the weight.

Description

Technical Field

[0001] This utility model relates to the field of high-pressure hose technology, and in particular to an ultra-high pressure acid fracturing hose and its assembly. Background Technology

[0002] Acid fracturing is a common process used in oil and gas extraction, which involves injecting acidic fluid to enhance the connectivity of wellbore pores and increase production capacity. Acid fracturing hoses, a crucial component of this technology, withstand high pressure and harsh environments while transporting the acidic medium. With the development of the oil and gas industry and the demand for increased production capacity, the demand for acid fracturing technology and related hoses is constantly increasing.

[0003] Key characteristics of acid fracturing hoses include acid resistance, high pressure withstand capability, abrasion resistance, and temperature range adaptability. To meet these requirements, hoses are typically made of special materials, such as acid-resistant polymers or rubber, and reinforced with additional steel wire layers. Furthermore, the inner lining of the hose comes into direct contact with the fracturing fluid, an acidic liquid containing a significant amount of sediment. This necessitates that the inner lining, in direct contact with the fracturing fluid, possess excellent acid corrosion resistance and abrasion resistance.

[0004] The existing acid fracturing hoses mainly have the following problems: 1) The inner lining of the hose usually only includes a plastic layer, which is directly bonded to the inner rubber layer. The bonding force at the interface between the two is insufficient, and the inner lining layer is prone to peeling off from the inner rubber layer, which reduces the wear resistance and acid resistance of the inner wall of the hose; 2) The skeleton of the hose is mostly composed of steel wire or steel wire rope or a combination of both. In order to meet the pressure requirements of acid fracturing hoses, steel wire needs to be wound up to 10 layers, and steel wire rope needs to be wound 6 layers, resulting in excessive hose wall thickness and excessive weight per unit length of hose, which brings many inconveniences to transportation and assembly. Summary of the Invention

[0005] In view of the above analysis, the present invention aims to provide an ultra-high pressure acid fracturing hose and its assembly to solve at least one of the following problems of existing acid fracturing hoses: (1) the inner liner is not firmly bonded to the rest of the hose, resulting in a decrease in the hose’s wear resistance and acid resistance; (2) it is too heavy and has low flexibility.

[0006] The objective of this utility model is mainly achieved through the following technical solutions:

[0007] This utility model provides an ultra-high pressure acid fracturing hose, which includes, from the inside out, a composite liner, an inner rubber layer, a first buffer layer, a skeleton, a second buffer layer, an outer rubber layer, and a protective layer.

[0008] The composite liner has a double-layer structure, consisting of a wear-resistant plastic layer and an affinity layer. The affinity layer is located between the wear-resistant plastic layer and the inner rubber layer and is used to enhance the affinity between the wear-resistant plastic layer and the inner rubber layer.

[0009] Furthermore, the inner surface of the wear-resistant plastic layer is also provided with a textured structure, which is selected from one or more combinations of spiral texture, diamond texture, wave texture, and sawtooth texture.

[0010] Furthermore, the spiral texture has a pitch of 1.5 to 2.5 mm and a depth of 0.2 to 0.4 mm, and adopts a bidirectional spiral structure.

[0011] Furthermore, the diamond-shaped texture has a side length of 0.5 to 2 mm, an interior angle that alternates between α and 180°-α, and a depth that gradually changes from 0.2 mm to 0.4 mm from the center of the diamond to the edge, with α being 60 to 120°.

[0012] Furthermore, the wave-shaped texture is composed of alternating combinations of sine and cosine waves with wavelengths of 2–4 mm and amplitudes of 0.1–0.3 mm.

[0013] Furthermore, the serrated texture is composed of isosceles triangles with side lengths of 0.5–2 mm, interior angles α = 60–120°, and depths of 0.2–0.4 mm connected in sequence.

[0014] Furthermore, the ultra-high pressure acid fracturing hose also includes a heat insulation layer and / or an antistatic layer; wherein the heat insulation layer is disposed between the skeleton and the outer rubber layer; and the antistatic layer is disposed between the skeleton and the inner rubber layer.

[0015] Furthermore, the skeleton comprises M high-strength fiber layers, where M ≥ 2 and M is an even number.

[0016] Furthermore, the skeleton also includes N layers of steel wire, where 1 / 3 ≤ M / (M+N) ≤ 1, and N is an even number.

[0017] This utility model also provides an ultra-high pressure acid fracturing hose assembly, including the ultra-high pressure acid fracturing hose as described above and an anti-loosening component disposed at the joint of the ultra-high pressure acid fracturing hose.

[0018] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0019] (1) This invention upgrades the single-layer inner liner in traditional acid fracturing hoses, which is in direct contact with fracturing fluid, to a double-layer composite liner. The composite liner includes a wear-resistant plastic layer and an affinity layer. The affinity layer serves as a transition layer between the wear-resistant plastic layer and the inner rubber layer. Utilizing the good affinity between the affinity layer and the rubber, a strong interfacial bond is achieved between the affinity layer and the inner rubber layer, thereby enhancing the bonding strength between the inner liner (composite liner) and the inner rubber layer in the hose. This effectively prevents delamination of the single-layer inner liner and the directly bonded inner rubber layer during use of traditional acid fracturing hoses, thus improving the overall performance and reliability of the hose. By optimizing the inner liner structure of the hose, this invention can more effectively resist the corrosion of fracturing fluid and the abrasion of sludge, significantly improving the acid corrosion resistance and wear resistance of acid fracturing hoses. It effectively solves the problem of decreased wear resistance and acid corrosion resistance in traditional acid fracturing hoses due to the weak bonding between the inner liner and the rest of the hose in practical applications.

[0020] (2) In some preferred embodiments, the present invention can guide the fluid to flow more evenly by adding a textured structure to the inner surface of the wear-resistant plastic layer of the hose (i.e. the surface that is in direct contact with the fluid), thereby reducing the eddies and turbulence of the fluid in the hose, thereby reducing the impact and wear of the fluid on the inner wall of the hose, i.e. the wear-resistant plastic layer, and improving the fluid transmission efficiency; the textured structure helps to disperse the wear of the fluid on the inner wall of the hose, i.e. the wear-resistant plastic layer, making the wear more evenly distributed, avoiding excessive wear in some areas, thereby extending the service life of the hose.

[0021] (3) In some preferred embodiments, the ultra-high pressure acid fracturing hose further includes a heat insulation layer and / or an antistatic layer to improve the hose's adaptability to various complex working conditions, such as deep well operations or high-temperature formations. The heat insulation layer can effectively isolate external heat, prevent the internal temperature of the hose from becoming too high, thereby protecting the key components inside the hose from heat damage and ensuring that the fracturing fluid maintains an appropriate temperature during transmission, avoiding performance fluctuations caused by temperature changes. During the flow of high-pressure fluid, especially when it contains fracturing fluid with low conductivity, static electricity is easily generated. The antistatic layer can effectively conduct and dissipate static charge, preventing static electricity from accumulating to dangerous levels.

[0022] (4) In some preferred embodiments, the present invention further optimizes the skeleton in the hose. Specifically, a high-strength fiber layer is used to partially or completely replace the steel wire layer commonly used in the existing skeleton. While ensuring that the comprehensive performance of the acid fracturing hose, such as strength and pressure bearing capacity, is not affected, the weight per unit length of the hose is reduced and the flexibility of the hose is improved, effectively solving the problems of excessive weight and poor flexibility of the existing acid fracturing hose.

[0023] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained through the embodiments described and the accompanying drawings, which are particularly pointed out. Attached Figure Description

[0024] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0025] Figure 1 This is a schematic diagram of the structure of the ultra-high pressure acid fracturing hose provided in an embodiment of the present invention;

[0026] Figure label:

[0027] 1-Abrasion-resistant plastic layer; 2-Affinity layer; 3-Inner adhesive layer; 4-First buffer layer; 5-Reinforcing material layer; 6-Middle adhesive buffer layer; 7-Second buffer layer; 8-Outer adhesive layer; 9-Protective layer. Detailed Implementation

[0028] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0029] This utility model provides an ultra-high pressure acid fracturing hose, which includes, from the inside out, a composite liner, an inner rubber layer 3, a first buffer layer 4, a skeleton, a second buffer layer 7, an outer rubber layer 8, and a protective layer 9.

[0030] The composite liner has a double-layer structure, consisting of a wear-resistant plastic layer 1 and an affinity layer 2. The affinity layer 2 is located between the wear-resistant plastic layer 1 and the inner rubber layer 3, and is used to enhance the affinity between the wear-resistant plastic layer 1 and the inner rubber layer 3.

[0031] Compared with existing technologies, this invention upgrades the single-layer inner liner in traditional acid fracturing hoses, which is in direct contact with fracturing fluid, to a double-layer composite liner. The composite liner includes a wear-resistant plastic layer and an affinity layer. The affinity layer, acting as a transition layer between the wear-resistant plastic layer and the inner rubber layer, utilizes the good affinity between itself and the rubber to achieve a strong interfacial bond. This enhances the bonding strength between the liner (composite liner) and the inner rubber layer in the hose, effectively preventing delamination between the single-layer liner and the directly bonded inner rubber layer during use in traditional acid fracturing hoses. This improves the overall performance and reliability of the hose. By optimizing the hose's liner structure, this invention enables the hose to more effectively resist corrosion from fracturing fluid and abrasion from sediment, significantly improving the acid corrosion resistance and wear resistance of acid fracturing hoses. It effectively solves the problem of decreased wear resistance and acid corrosion resistance in traditional acid fracturing hoses due to weak bonding between the liner and other components in practical applications.

[0032] In some preferred embodiments, the inner surface of the wear-resistant plastic layer 1 is further provided with a textured structure, which is selected from one or a combination of spiral texture, diamond texture, wavy texture, and sawtooth texture. By adding a textured structure to the inner surface of the wear-resistant plastic layer of the hose (i.e., the surface in direct contact with the fluid), the fluid can be guided to flow more evenly, reducing eddies and turbulence in the hose, thereby reducing the impact and wear of the fluid on the inner wall of the hose, i.e., the wear-resistant plastic layer, and improving fluid transmission efficiency; the textured structure helps to disperse the wear of the fluid on the inner wall of the hose, i.e., the wear-resistant plastic layer, making the wear more evenly distributed, avoiding excessive local wear, and thus extending the service life of the hose.

[0033] In some embodiments, the spiral texture has a pitch of 1.5–2.5 mm and a depth of 0.2–0.4 mm, employing a bidirectional spiral structure. It should be noted that this pitch range of 1.5–2.5 mm ensures that the fluid can flow effectively along the texture without generating excessive eddies or turbulence during flow, helping to maintain a stable flow state and reducing uneven wear on the inner surface of the wear-resistant plastic layer in the composite liner caused by turbulence. This depth range of 0.2–0.4 mm provides sufficient roughness to enhance the friction between the inner surface of the wear-resistant plastic layer in the composite liner and the fluid, making it less likely for solid particles (such as silt) in the fluid to deposit on the inner surface of the wear-resistant plastic layer, forming localized wear points, without excessively weakening the wear-resistant plastic layer in the composite liner. The bidirectional spiral structure, meaning that left-handed and right-handed spiral textures exist simultaneously on the same circumference of the inner surface of the wear-resistant plastic layer in the composite liner, allows the fluid to form complex flow paths during flow, further reducing the possibility of localized wear, and maintaining good stability under pressure from different directions.

[0034] In some embodiments, the rhombus texture has a side length of 0.5–2 mm, with alternating interior angles of α and 180°–α, and its depth gradually changes from 0.2 mm to 0.4 mm from the center to the edge, with α being 60–120°. It should be noted that the smaller side length of 0.5–2 mm increases the texture density, making the inner surface of the wear-resistant plastic layer in the composite lining rougher, thereby improving the ability to capture solid particles in the fluid and preventing direct impact wear from particles on the inner surface of the wear-resistant plastic layer in the composite lining. The design of the interior angles of the rhombus texture as alternating α and 180°–α, with α = 60–120°, allows the fluid to produce complex refraction and reflection phenomena when flowing over the textured surface, promoting fluid mixing and dispersion, and avoiding corrosion and wear caused by local fluid stagnation. The gradual depth design, with the depth gradually increasing from 0.2 mm to 0.4 mm from the center to the edge of the rhombus, allows the central area to guide the fluid to a certain extent while the edge area better resists the wear of solid particles, provided that the overall structural strength is maintained.

[0035] In some embodiments, the wavy texture is composed of alternating combinations of sine and cosine waves with wavelengths of 2–4 mm and amplitudes of 0.1–0.3 mm. It should be noted that this wavelength range of 2–4 mm can accommodate common fluid flow characteristics, causing the fluid to oscillate periodically on the wavy texture. This helps to break down the fluid boundary layer, reduce boundary layer separation, and thus lower fluid resistance. An appropriate amplitude of 0.1–0.3 mm can provide sufficient roughness on the inner surface of the wear-resistant plastic layer without affecting the overall structural strength of the wear-resistant plastic layer in the composite liner. This enhances the interaction between the inner surface texture and solid particles in the fluid, making it easier for solid particles to flow with the fluid and prevent them from depositing on the inner surface of the wear-resistant plastic layer and forming wear sources.

[0036] In some embodiments, the serrated texture is composed of isosceles triangles with side lengths of 0.5 to 2 mm, interior angles α = 60 to 120°, and depths of 0.2 to 0.4 mm connected in sequence.

[0037] Optionally, the material of the affinity layer 2 can be selected from existing materials, with the main consideration being its good affinity with the inner adhesive layer 3. For example, the affinity layer 2 includes, but is not limited to, at least one of a nylon layer and a polyester layer.

[0038] For example, the thickness of the affinity layer 2 is 0.8 to 1.5 mm. This thickness range ensures good affinity between the affinity layer and the inner adhesive layer, avoiding the bonding effect being affected by being too thin, and also preventing uneven bonding or increased internal stress due to being too thick.

[0039] Optionally, the material of the wear-resistant plastic layer 1 can be selected from existing materials, with the main considerations being its excellent acid corrosion resistance and wear resistance. For example, the wear-resistant plastic layer 1 includes at least one of the following: ultra-high molecular weight polyethylene layer, polyketide layer, polyimide layer, polyamide-imide layer, polytetrafluoroethylene layer, polyphenylene sulfide layer, nylon + polytetrafluoroethylene composite layer, nylon + molybdenum disulfide composite layer, polyoxymethylene + polytetrafluoroethylene composite layer, polyoxymethylene + silicone oil composite layer, and polycarbonate + polytetrafluoroethylene composite layer.

[0040] In some embodiments, the wear-resistant plastic layer 1 is a composite layer of wear-resistant and corrosion-resistant plastic and wear-resistant particles. The wear-resistant particles are selected from one or more combinations of silicon carbide, alumina, and diamond, and the particle size of the wear-resistant particles is 10-50 μm, with a content of 2-15%.

[0041] This invention effectively improves the wear resistance of the hose by setting a special textured structure on the inner surface of the wear-resistant plastic layer and / or using a composite layer of wear-resistant and corrosion-resistant plastic + wear-resistant particles as the wear-resistant plastic layer. In simulated mud and sand abrasion tests, after 1000 hours of wear, the wear amount of the composite liner in the hose of this invention does not exceed 0.5 mm, which is at least 30% higher than the single-layer liner of traditional acid fracturing hoses.

[0042] To further improve the adaptability of the hose to various complex working conditions, in some preferred embodiments, the ultra-high pressure acid fracturing hose also includes a heat insulation layer and / or an antistatic layer; wherein, the heat insulation layer is disposed between the skeleton and the outer rubber layer 8, and the antistatic layer is disposed between the skeleton and the inner rubber layer 3. Acid fracturing hoses typically operate under harsh environmental conditions such as high temperature and high pressure, for example, in deep well operations or high-temperature formations. The heat insulation layer effectively isolates external heat, preventing excessively high internal temperatures of the hose, thereby protecting critical components inside the hose from heat damage and ensuring that the fracturing fluid maintains an appropriate temperature during transmission, avoiding performance fluctuations caused by temperature changes. During high-pressure fluid flow, especially when containing fracturing fluid with low conductivity, static electricity is easily generated. The antistatic layer effectively conducts and dissipates static charge, preventing static electricity accumulation to dangerous levels.

[0043] Optionally, the materials of the heat insulation layer and the antistatic layer can be selected from existing materials. When selecting, the main considerations are that the heat insulation layer has good heat insulation performance and the antistatic layer has good static electricity discharge capability.

[0044] Optionally, the material of the inner rubber layer can be selected from existing materials. For example, the inner rubber layer 3 includes, but is not limited to, at least one of natural rubber, styrene-butadiene rubber, and cis-butadiene rubber.

[0045] For example, the first buffer layer 4, the intermediate rubber buffer layer 6, and the second buffer layer 7 are composed of rubber-coated fabric. The rubber-coated fabric can be one or more layers. For multi-layered rubber-coated fabric, the winding directions of odd-numbered and even-numbered layers are opposite; for example, the winding directions alternate between left-handed and right-handed rotations. The winding direction of the rubber-coated fabric is the same as the winding direction of the reinforcing material layer adjacent to the rubber-coated fabric.

[0046] For example, the thickness of the first buffer layer 4 and the second buffer layer 7 is 0.5 to 1.5 mm.

[0047] Optionally, the material of the outer rubber layer can be selected from existing materials, with the main consideration being its good wear resistance and environmental aging resistance. For example, the outer rubber layer 8 includes at least one of a chloroprene rubber layer, a hydrogenated nitrile rubber layer, a fluororubber layer, and a EPDM rubber layer.

[0048] Optionally, the material of the protective layer can be selected from existing materials, with the primary consideration being its good cut and puncture resistance. For example, the protective layer 9 includes at least one of an ultra-high molecular weight polyethylene fiber braided layer and a steel wire braided layer.

[0049] For example, the thicknesses of the inner adhesive layer 3 and the outer adhesive layer 8 are 3 to 5 mm. For instance, the thickness of the inner adhesive layer 3 is 2 to 3 mm, and the thickness of the outer adhesive layer 8 is 3 to 4 mm.

[0050] While ensuring the comprehensive performance of the ultra-high pressure acid fracturing hose, such as acid corrosion resistance and wear resistance, this utility model also further optimizes the structure of the skeleton in order to further reduce the weight of the hose and improve its flexibility.

[0051] In some embodiments, the skeleton of the ultra-high pressure acid fracturing hose is composed of a reinforcing material layer 5 and a medium rubber buffer layer 6;

[0052] The number of reinforcing material layers 5 is multiple, and the number of intermediate rubber buffer layers 6 is multiple;

[0053] The reinforcing material layer 5 and the intermediate rubber buffer layer 6 are alternately arranged;

[0054] At least one of the reinforcing material layers is a high-strength fiber layer.

[0055] In some preferred embodiments, the skeleton comprises M high-strength fiber layers, where M ≥ 2, and M is an even number.

[0056] Compared with the prior art, this utility model uses a high-strength fiber layer to partially or completely replace the steel wire layer commonly used in the existing skeleton. While ensuring that the comprehensive performance of the acid fracturing hose, such as strength and pressure bearing capacity, is not affected, the weight per unit length of the hose is reduced and the flexibility of the hose is improved. This helps to solve the problems of excessive weight and poor flexibility of existing acid fracturing hoses.

[0057] In some embodiments, the skeleton further includes N layers of steel wire, where 1 / 3 ≤ M / (M+N) ≤ 1, and N is an even number. By setting at least one-third of the total number of reinforcing material layers as high-strength fiber layers, the weight per unit length of the hose can be significantly reduced and the flexibility of the hose can be improved while ensuring the hose strength to withstand high-pressure environments.

[0058] In some embodiments, the M-layer high-strength fiber layer is radially continuous in the skeleton, and the M-layer high-strength fiber layer and the middle rubber buffer layer 6 are alternately arranged. In the M-layer high-strength fiber layer, the winding directions of the odd-numbered and even-numbered high-strength fiber layers are opposite, and the winding angle increases layer by layer from the inside to the outside of the hose. Exemplarily, the winding directions are left-handed and right-handed, respectively. Preferably, the winding angle is 51° to 59°. The opposite winding directions of the odd-numbered and even-numbered layers can create a mutually canceling effect when under stress, making the stress more evenly distributed throughout the structure and avoiding local stress concentration. By winding in both directions, fatigue damage caused by unidirectional stress is reduced, and the service life of the hose is extended. By the gradient change of the winding angle from the inside to the outside, the flexibility and rigidity of the skeleton can be optimized and balanced while saving materials and costs and without significantly increasing weight. The smaller winding angle of the inner layer makes the hose more flexible overall, while the larger winding angle of the outer layer provides the necessary rigid support, ensuring that the hose can maintain good shape stability under high pressure.

[0059] For example, M+N is 6 to 12.

[0060] For example, the thickness of each intermediate rubber buffer layer 6 is 0.5–1.5 mm. It comprehensively considers multiple factors such as stress dispersion, protection of the reinforcing material layer, adhesion effect, flexibility, temperature adaptability, and cost control, providing an optimized solution for ultra-high pressure hoses. A reasonable buffer layer thickness can maximize the strength, flexibility, and durability of the hose without sacrificing performance, ensuring its reliability and safety under extreme conditions.

[0061] In some embodiments, the high-strength fiber layer includes a high-strength fiber core layer and a polyester sheath layer and / or a nylon sheath layer. By employing such a high-strength fiber layer formed from high-strength fibers with a core-sheath structure, the interfacial affinity between the high-strength fiber layer and other rubber layers (e.g., a middle rubber buffer layer) can be improved while ensuring strength, thereby ensuring the bonding stability of the high-strength fiber layer with other layers in the skeleton.

[0062] Optionally, the high-strength fiber can be selected from existing materials, primarily considering its high strength and high modulus properties, such as a tensile strength ≥1.5 GPa, a central modulus of 100–140 GPa, and a surface modulus of 1–5 GPa. Exemplarily, it includes one or a combination of aramid fibers, carbon fibers, glass fibers, ultra-high molecular weight polyethylene fibers, and high-strength bio-based fibers.

[0063] In some embodiments, the high-strength fiber layer is composed of high-strength fibers and nylon, as well as at least one of polyester and nylon.

[0064] Optionally, the fiber connection structure of the high-strength fiber layer can be selected from existing weaving structures, exemplarily including one or a combination of several of the following: smooth weave, twill weave, satin weave, cross weave, multi-strand weave, figure-eight weave, biaxial weave, and triaxial weave.

[0065] This utility model also provides an ultra-high pressure acid fracturing hose assembly, including the ultra-high pressure acid fracturing hose as described above and an anti-loosening component. The anti-loosening component includes a first clamp, a second clamp, and a locking member. The first clamp and the second clamp are respectively fitted on both sides of the joint of the ultra-high pressure acid fracturing hose, and both the first clamp and the second clamp are clamped on the ultra-high pressure acid fracturing hose. The two ends of the locking member are respectively connected to the first clamp and the second clamp.

[0066] In some preferred embodiments, either the first clamp or the second clamp is formed by the attraction of two semi-circular magnetic components, and a pressure sensor is installed inside the ultra-high pressure acid fracturing hose. Both the pressure sensor and the semi-circular magnetic components are connected to a magnetic control device.

[0067] It is understandable that the pressure sensor monitors and collects the fluid pressure information inside the hose, and transmits the pressure information to the magnetic control device. The magnetic control device adjusts the attraction between the two semi-circular magnetic components according to the pressure change, so as to achieve adaptive adjustment of the locking force of the hose by the anti-loosening component.

[0068] For example, each semi-circular magnetic component includes a permanent magnet and an electromagnet. The permanent magnet provides the basic attractive force, while the electromagnet can enhance or weaken the attractive force as needed.

[0069] For example, the pressure sensor communicates with the magnetic control device wirelessly or via wired means to transmit pressure information in real time.

[0070] For example, the magnetic control device includes a central processing unit (CPU) / microcontroller, a power management system, and an interface structure.

[0071] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. An ultra-high pressure acidizing fracturing hose characterized in that, The super-high-pressure acidizing fracturing hose comprises, from inside to outside, a composite inner liner, an inner rubber layer (3), a first buffer layer (4), a skeleton, a second buffer layer (7), an outer rubber layer (8), and a protective layer (9). The composite inner liner has a double-layer structure and is composed of a wear-resistant plastic layer (1) and an affinity layer (2).

2. The ultra-high pressure acidizing fracturing hose of claim 1, wherein, The inner surface of the wear-resistant plastic layer (1) is further provided with a texture structure selected from one or a combination of spiral texture, rhombic texture, wavy texture, and sawtooth texture.

3. The ultra-high pressure acidizing frac hose of claim 2, wherein, The spiral texture has a pitch of 1.5-2.5 mm and a depth of 0.2-0.4 mm, and adopts a bidirectional spiral structure.

4. The ultra-high pressure acidizing frac hose of claim 2, wherein, The rhombic texture has a side length of 0.5-2 mm, and its internal angles are alternately arranged as α and 180°-α, and the depth gradually changes from 0.2 mm at the center of the rhombus to 0.4 mm at the edge, and α is 60-120°.

5. The ultra-high pressure acidizing frac hose of claim 2, wherein, The wavy texture is composed of sine waves and cosine waves with a wavelength of 2-4 mm and an amplitude of 0.1-0.3 mm.

6. The ultra-high pressure acidizing frac hose of claim 2, wherein, The sawtooth texture is composed of isosceles triangles with a side length of 0.5-2 mm, an internal angle α of 60-120°, and a depth of 0.2-0.4 mm.

7. The ultra-high pressure acidizing frac hose of claim 1, wherein, The super-high-pressure acidizing fracturing hose further comprises a heat insulation layer and / or an electrostatic layer.

8. The ultra-high pressure acidizing frac hose of claim 1, wherein, The skeleton comprises M high-strength fiber layers, and M is an even number greater than or equal to 2.

9. The ultra-high pressure acidizing frac hose of claim 8, wherein, The skeleton further comprises N steel wire layers, and 1 / 3≤M / (M+N)≤1, and N is an even number.

10. An assembly of ultra-high pressure acidizing fracturing hoses, characterized in that, The super-high-pressure acidizing fracturing hose comprises a super-high-pressure acidizing fracturing hose according to any one of claims 1-9 and an anti-loosening member arranged at a joint of the super-high-pressure acidizing fracturing hose.

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