A high-pressure fire-resistant drilling hose

Abstract

The present invention belongs to the technical field of polymer material preparation, and specifically relates to a high-pressure fire-resistant drilling hose, and its technical points are as follows: the drilling hose includes, from the inside to the outside: an inner rubber layer, a reinforcement layer, an outer rubber layer and a heat-insulating layer; wherein the inner rubber layer is fluororubber; the reinforcement layer is composed of 1 to 4 layers of steel wire and glass-carbon fiber mixed layers; the outer rubber layer is chloroprene rubber; and the heat-insulating layer is ceramic fiber. The present invention provides a high-pressure fire-resistant drilling hose, in which the reinforcement layer is prepared by mixing steel wire and glass-carbon fiber, so that the hose has both high tensile strength and high compressive resistance, and is suitable for working environments that need to withstand complex stresses; the glass-carbon fiber is relatively light, which can reduce the overall weight of the hose and improve the convenience of operation; the high temperature resistance of the glass-carbon fiber is combined with the high compressive resistance of the steel wire, so that the hose has a longer service life in high temperature and high pressure environments.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer material preparation, and in particular relates to a high-pressure fire-resistant drilling hose. Background Art

[0002] High-pressure fire-resistant drilling hose is a special hose specially used for drilling and mining operations. It usually needs to have the following characteristics: high-pressure bearing capacity to ensure normal operation under high-pressure environment without rupture or leakage; fire resistance to maintain stability in high temperature or fire environment to prevent damage caused by high temperature; wear resistance and corrosion resistance, because drilling and mining process involves a lot of wear and corrosive substances, the hose needs to have good wear resistance and corrosion resistance to extend the service life; flexibility and bending resistance, so that it can be used flexibly during operation and not easy to break.

[0003] The drilling hose in the prior art usually cannot take into account both flexibility and pressure resistance. In particular, the aramid fiber layer and the steel wire layer are prone to breakage or delamination when encountering high temperatures due to the large difference in thermal expansion coefficients. Summary of the invention

[0004] The purpose of the present invention is to provide a high-pressure fire-resistant drilling hose, in which a reinforcement layer is prepared by mixing steel wire and glass carbon fiber, so that the hose has both high tensile strength and high compressive resistance, and is suitable for working environments that need to withstand complex stresses; the glass carbon fiber is relatively lightweight, which can reduce the overall weight of the hose and improve the ease of operation; the high temperature resistance of the glass carbon fiber and the high compressive resistance of the steel wire are combined, so that the hose has a longer service life in high temperature and high pressure environments.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions:

[0006] The present invention provides a high-pressure fire-resistant drilling hose, which comprises, from inside to outside:

[0007] Inner rubber layer, reinforcement layer, outer rubber layer and thermal insulation layer;

[0008] Among them, the inner rubber layer is fluororubber; the reinforcement layer is composed of 1 to 4 layers of mixed layers of steel wire and glass carbon fiber; the outer rubber layer is chloroprene rubber; and the thermal insulation layer is ceramic fiber.

[0009] Furthermore, the reinforcement layer is mixed with steel wire as warp and glass fiber as weft;

[0010] The braiding angle is determined according to the tension requirements of the steel wire and the glass fiber.

[0011] In the present invention, the weaving method using steel wire as the warp and glass fiber as the weft can further optimize the performance of the high-pressure fire-resistant drilling hose. This weaving method can fully utilize the high compressive performance of the steel wire and the high tensile strength and high temperature resistance of the glass fiber. The weaving angle described in the present invention refers to the angle between the steel wire or the glass fiber and the axis of the drilling hose; in the present invention, by adjusting the interweaving density and the weaving angle, the different tension requirements of the steel wire and the glass fiber can be effectively solved, thereby optimizing the performance of the high-pressure fire-resistant drilling hose.

[0012] Furthermore, the braiding angle is calculated according to the following formula:

[0013] .

[0014] in, is the wire tension requirement, in units of ;

[0015] is the tension requirement of the glass fiber, in units of ;

[0016] is the diameter of the wire, in units of ;

[0017] is the diameter of the glass fiber, in units of ;

[0018] is the interweaving density of the steel wires, in roots / cm;

[0019] is the interweaving density of glass fiber, in roots / cm;

[0020] is the weaving angle, in degrees.

[0021] In the present invention, the difficulty of weaving with steel wire as warp and glass fiber as weft is mainly reflected in the difference in material properties. The steel wire has high rigidity and toughness, which makes it difficult to bend and shape during the weaving process and the steel wire is easy to rebound during weaving, resulting in increased difficulty in tension control during the weaving process, while the glass fiber is relatively soft and easy to bend and deform, which is in sharp contrast to the rigidity of the steel wire; the steel wire requires higher tension to maintain its linearity, but too high tension may cause the steel wire to break or be damaged; the glass fiber requires lower tension to avoid breakage or damage, so it is necessary to accurately control the tension of the two materials during the weaving process.

[0022] The braiding angle can control the tension. Therefore, in the present invention, a balance point is taken in the braiding angles of the steel wire and the glass fiber to accurately control the tension of the two materials during the braiding process. While ensuring the high rigidity of the steel wire, the flexibility of the glass fiber is taken into account, thereby greatly improving the mechanical properties of the drilling hose.

[0023] Furthermore, the interweaving density of the steel wires and the interweaving density of the glass-carbon fibers are calculated according to the genetic algorithm model.

[0024] In the present invention, the interweaving density of the steel wire and the glass-carbon fiber is controlled to effectively disperse the tension during the weaving process, which can further solve the different tension requirements of the steel wire and the glass-carbon fiber, thereby optimizing the performance of the high-pressure fire-resistant drilling hose.

[0025] Genetic algorithm model Genetic algorithm can perform global optimization in the entire search space by simulating natural selection and genetic mechanism, which is very important for finding the best combination of steel wire and glass carbon fiber interweaving density, avoiding the problem that traditional optimization methods may fall into local optimality; and the interweaving density of steel wire and glass carbon fiber involves multivariate and nonlinear indicators. When calculating the interweaving density of steel wire and glass carbon fiber, it is necessary to comprehensively consider various performance indicators such as compressive strength, flexibility, wear resistance, etc. Genetic algorithm can effectively handle these complex constraints and goals; in the present invention, genetic algorithm can find the best balance between different goals through multi-objective optimization strategy.

[0026] Furthermore, the fitness function used by the genetic algorithm model is:

[0027] .

[0028] in, It is the compressive strength of the combination of steel wire interlacing density and glass fiber interlacing density;

[0029] It is the flexibility of the combination of steel wire interweaving density and glass fiber interweaving density;

[0030] and are the weights of compression resistance and flexibility respectively.

[0031] In the present invention, the compression resistance and flexibility are used as the calculation of the interweaving density of the steel wires and the interweaving density of the glass-carbon fibers, so that the drilling hose has both the compression resistance and the flexibility.

[0032] Furthermore, the weight of stress resistance and the weight of flexibility , the following conditions are met:

[0033] Calculated from the inside out, in the 1st and 2nd layers of steel wire and glass fiber mixed layers, ; In the 3rd to 4th layers of steel wire and glass fiber mixed layers, .

[0034] In the present invention, the above-mentioned configuration is adopted to optimize the performance distribution of the inner and outer layers, with the inner layer (1st to 2nd layer) giving priority to compression resistance. , which means that the weight of compressive resistance is higher, and more emphasis is placed on improving the compressive resistance of the inner layer. This is because the inner layer is in direct contact with the fluid and bears the highest internal pressure. Therefore, a higher compressive resistance is required to prevent rupture. Improving the compressive resistance of the inner layer helps to maintain the structural stability of the entire hose and prevent the inner layer from deforming or failing under high pressure.

[0035] The outer layer (3rd to 4th layer) is set , which means that the weight of flexibility is relatively high, and more emphasis is placed on improving the flexibility of the outer layer. This is because the outer layer needs higher flexibility to adapt to the bending and torsion requirements in the external environment and reduce the risk of damage to the hose during operation. At the same time, the flexible outer layer can better absorb and disperse external impacts and extend the service life of the hose.

[0036] In the present invention, by setting different weight ratios in different layers, a hierarchical design of the hose performance can be achieved, with the inner layer being pressure-resistant and the outer layer being flexible. This design enables the inner and outer layers of the hose to achieve the best performance in their respective most critical performance indicators. The high pressure resistance of the inner layer is mainly used to cope with internal pressure, while the high flexibility of the outer layer copes with external mechanical stress. This shares stresses from different sources and improves the overall performance. It can prevent the inner layer from rupturing due to excessive pressure, and prevent the outer layer from breaking due to lack of flexibility. The reasonable distribution of pressure resistance and flexibility properties helps to reduce stress concentration and material fatigue, and extend the service life of the hose.

[0037] Furthermore, in the glass fiber, the mass ratio of glass fiber to carbon fiber is 1:(1~2).

[0038] Furthermore, the ceramic fiber, calculated by weight, includes the following components:

[0039] 65-85 parts of fused chromium oxide, 8-15 parts of aluminum oxide powder, 0.3-0.8 parts of europium oxide powder and 5-8 parts of binder.

[0040] In the present invention, europium oxide is added as an additive to the component formula of ceramic fiber, which can optimize the component formula of ceramic fiber and significantly improve the high temperature performance, mechanical strength, chemical corrosion resistance and processing performance of the material.

[0041] Furthermore, the ratio of the average particle size of the fused chromium oxide to the average particle size of the alumina powder is 50-150.

[0042] In the present invention, large particles of fused chromium oxide act as a skeleton in the ceramic fiber, providing overall structural strength and stability. The larger particle size helps to form an appropriate pore structure in the material, which is beneficial to thermal insulation and reducing the density of the material. Small particles of alumina powder can fill the gaps between the fused chromium oxide particles, increasing the density and uniformity of the material and providing more grain boundaries and phase boundaries, thereby enhancing the mechanical strength and wear resistance of the material.

[0043] Furthermore, the thickness ratio of the reinforcement layer to the heat insulation layer is determined by the ratio of the interweaving density of the steel wires to the interweaving density of the glass-carbon fibers.

[0044] In the present invention, the reinforcing layer is prepared by mixing steel wire and glass carbon fiber. The thermal expansion coefficient of the steel wire is much larger than that of the ceramic fiber. Among the glass carbon fibers, the thermal expansion coefficient of the glass fiber is close to that of the ceramic fiber, and the thermal expansion coefficient of the carbon fiber is much smaller than that of the ceramic fiber. The present invention determines the thickness ratio of the reinforcing layer and the thermal insulation layer by the ratio of the interweaving density of the steel wire to the interweaving density of the glass carbon fiber, which can make the thermal expansion coefficient more evenly distributed inside the material, reduce thermal stress concentration and thermal fatigue, improve the durability of the hose, make the expansion and contraction of the drilling hose at different temperatures more coordinated, and maintain the stability of the overall structure.

[0045] In summary, the present invention has the following beneficial effects:

[0046] The present invention provides a high-pressure fire-resistant drilling hose, in which steel wire and glass carbon fiber are mixed to prepare a reinforcement layer, so that the hose has both high tensile strength and high compressive resistance, and is suitable for working environments that need to withstand complex stresses; the glass carbon fiber is relatively lightweight, which can reduce the overall weight of the hose and improve operational convenience; the high temperature resistance of the glass carbon fiber and the high compressive resistance of the steel wire are combined, so that the hose has a longer service life in high temperature and high pressure environments; compared with the full steel wire braided layer, the flexibility of the hose is improved after the glass carbon fiber is added, and it is more convenient to operate and arrange. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 Schematic diagram of the structure of the drilling hose in the embodiment.

[0048] Reference numerals

[0049] 1. Inner rubber layer, 2. Reinforcement layer, 3. Outer rubber layer, 4. Thermal insulation layer. DETAILED DESCRIPTION

[0050] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, a high-pressure refractory drilling hose proposed in accordance with the present invention, its specific implementation method, characteristics and effects are described in detail as follows.

[0051] This specific embodiment provides a high-pressure fire-resistant drilling hose, which includes, from inside to outside:

[0052] Inner rubber layer 1, reinforcement layer 2, outer rubber layer 3 and thermal insulation layer 4;

[0053] Among them, the inner rubber layer is fluororubber; the reinforcement layer is composed of 1 to 4 layers of mixed layers of steel wire and glass carbon fiber; the outer rubber layer is chloroprene rubber; and the thermal insulation layer is ceramic fiber.

[0054] In some preferred embodiments, the reinforcement layer 2 is mixed with steel wires as warps and glass-carbon fibers as wefts;

[0055] The braiding angle is determined according to the tension requirements of the steel wire and the glass fiber.

[0056] In this specific embodiment, the weaving method using steel wire as the warp and glass fiber as the weft can further optimize the performance of the high-pressure fire-resistant drilling hose. This weaving method can fully utilize the high compressive performance of the steel wire and the high tensile strength and high temperature resistance of the glass fiber. The weaving angle described in this specific embodiment refers to the angle between the steel wire or the glass fiber and the axis of the drilling hose; in the present invention, by adjusting the interweaving density and the weaving angle, the different tension requirements of the steel wire and the glass fiber can be effectively solved, thereby optimizing the performance of the high-pressure fire-resistant drilling hose.

[0057] In some preferred embodiments, the braiding angle is calculated according to the following formula: .

[0058] in, is the wire tension requirement, in units of ;

[0059] is the tension requirement of the glass fiber, in units of ;

[0060] is the diameter of the wire, in units of ;

[0061] is the diameter of the glass fiber, in units of ;

[0062] is the interweaving density of the steel wires, in roots / cm;

[0063] is the interweaving density of glass fiber, in roots / cm;

[0064] is the weaving angle, in degrees.

[0065] In this specific embodiment, the difficulty of weaving with steel wire as the warp and glass carbon fiber as the weft is mainly reflected in the difference in material properties. The steel wire has high rigidity and toughness, which makes it difficult to bend and shape during the weaving process, and the steel wire is easy to rebound during weaving, which increases the difficulty of tension control during the weaving process. The glass carbon fiber is relatively soft and easy to bend and deform, which is in sharp contrast to the rigidity of the steel wire. The steel wire requires higher tension to maintain its straightness, but too high tension may cause the steel wire to break or be damaged. The glass carbon fiber requires lower tension to avoid breakage or damage, so it is necessary to accurately control the tension of the two materials during the weaving process.

[0066] The braiding angle can control the tension. Therefore, in the present invention, a balance point is taken in the braiding angles of the steel wire and the glass fiber to accurately control the tension of the two materials during the braiding process. While ensuring the high rigidity of the steel wire, the flexibility of the glass fiber is taken into account, thereby greatly improving the mechanical properties of the drilling hose.

[0067] In some preferred embodiments, the interweaving density of the steel wires and the interweaving density of the glass-carbon fibers are calculated based on a genetic algorithm model.

[0068] In this specific embodiment, the interweaving density of the steel wire and the glass carbon fiber is controlled to effectively disperse the tension during the weaving process, which can further solve the different tension requirements of the steel wire and the glass carbon fiber, thereby optimizing the performance of the high-pressure refractory drilling hose.

[0069] Genetic algorithm model Genetic algorithm can perform global optimization in the entire search space by simulating natural selection and genetic mechanism, which is very important for finding the best combination of steel wire and glass carbon fiber interweaving density, avoiding the problem that traditional optimization methods may fall into local optimality; and the interweaving density of steel wire and glass carbon fiber involves multivariate and nonlinear indicators. When calculating the interweaving density of steel wire and glass carbon fiber, it is necessary to comprehensively consider various performance indicators such as compressive strength, flexibility, wear resistance, etc. Genetic algorithm can effectively handle these complex constraints and goals; in the present invention, genetic algorithm can find the best balance between different goals through multi-objective optimization strategy.

[0070] In some preferred embodiments, the fitness function used by the genetic algorithm model is:

[0071] .

[0072] in, It is the compressive strength of the combination of steel wire interlacing density and glass fiber interlacing density;

[0073] It is the flexibility of the combination of steel wire interweaving density and glass fiber interweaving density;

[0074] and are the weights of compression resistance and flexibility respectively.

[0075] Specifically, the genetic algorithm model is used to calculate the interweaving density of steel wires and the interweaving density of glass-carbon fibers, including the following steps:

[0076] S1. Collect data, including: target value of compressive strength, target value of flexibility, interweaving density range of steel wire and interweaving density range of glass fiber;

[0077] S2. Initial population generation: Generate an initial population. Each individual represents a density combination, where the interweaving density of the steel wire is , the interweaving density of glass fiber is , each individual i Expressed as ;

[0078] S3, design a fitness function to calculate the fitness of each individual based on stress resistance and flexibility;

[0079] S4, selection, using roulette selection method or tournament selection method to select individuals with higher fitness from the current population for reproduction;

[0080] S5, crossover, performing crossover operation on the selected individuals to generate new individuals;

[0081] S6, mutation, mutation operation is performed on the individuals after crossover to increase the diversity of the population;

[0082] S7. New population generation, using newly generated individuals to replace individuals with lower fitness to form a new population.

[0083] S8, iteration, repeating steps S4 to S7 until the maximum number of iterations is reached or the fitness function converges, and the optimal steel wire interlacing density and glass fiber interlacing density are obtained.

[0084] In this specific implementation, the compression resistance and flexibility are used to calculate the interweaving density of the steel wires and the interweaving density of the glass-carbon fibers, so that the drilling hose has both compression resistance and flexibility.

[0085] In some preferred embodiments, the weight of the stress resistance and the weight of flexibility , the following conditions are met:

[0086] Calculated from the inside out, in the 1st and 2nd layers of steel wire and glass fiber mixed layers, ; In the 3rd to 4th layers of steel wire and glass fiber mixed layers, .

[0087] In this specific embodiment, the above configuration is adopted to optimize the performance distribution of the inner and outer layers, with the inner layer (1st to 2nd layer) giving priority to compression resistance. , which means that the weight of compressive resistance is higher, and more emphasis is placed on improving the compressive resistance of the inner layer. This is because the inner layer is in direct contact with the fluid and bears the highest internal pressure. Therefore, a higher compressive resistance is required to prevent rupture. Improving the compressive resistance of the inner layer helps to maintain the structural stability of the entire hose and prevent the inner layer from deforming or failing under high pressure.

[0088] The outer layer (3rd to 4th layer) is set , which means that the weight of flexibility is relatively high, and more emphasis is placed on improving the flexibility of the outer layer. This is because the outer layer needs higher flexibility to adapt to the bending and torsion requirements in the external environment and reduce the risk of damage to the hose during operation. At the same time, the flexible outer layer can better absorb and disperse external impacts and extend the service life of the hose.

[0089] In this specific embodiment, by setting different weight ratios in different layers, a hierarchical design of the hose performance can be achieved, with the inner layer being pressure-resistant and the outer layer being flexible. This design allows the inner and outer layers of the hose to achieve the best performance in their respective most critical performance indicators. The high pressure resistance of the inner layer is mainly used to cope with internal pressure, while the high flexibility of the outer layer copes with external mechanical stress. This shares the stress from different sources and improves the overall performance. It can prevent the inner layer from rupturing due to excessive pressure, and prevent the outer layer from breaking due to lack of flexibility. The reasonable distribution of pressure resistance and flexibility properties helps to reduce stress concentration and material fatigue, and extend the service life of the hose.

[0090] In some preferred embodiments, the mass ratio of glass fiber to carbon fiber in the glass-carbon fiber is 1:(1-2).

[0091] In some preferred embodiments, the ceramic fiber, calculated by weight, includes the following components:

[0092] 65-85 parts of fused chromium oxide, 8-15 parts of aluminum oxide powder, 0.3-0.8 parts of europium oxide powder and 5-8 parts of binder.

[0093] In this specific embodiment, europium oxide is added as an additive to the component formula of ceramic fibers, which can optimize the component formula of ceramic fibers and significantly improve the high temperature performance, mechanical strength, chemical corrosion resistance and processing performance of the material.

[0094] In some preferred embodiments, the ratio of the average particle size of the fused chromium oxide to the average particle size of the alumina powder is 50-150.

[0095] In this specific embodiment, large particles of fused chromium oxide act as a skeleton in the ceramic fiber, providing overall structural strength and stability. The larger particle size helps to form an appropriate pore structure in the material, which is beneficial to thermal insulation and reducing the density of the material. Small particles of alumina powder can fill the gaps between the fused chromium oxide particles, increasing the density and uniformity of the material and providing more grain boundaries and phase boundaries, thereby enhancing the mechanical strength and wear resistance of the material.

[0096] In some preferred embodiments, the thickness ratio of the reinforcement layer to the heat insulation layer is determined by the ratio of the interweaving density of the steel wires to the interweaving density of the glass-carbon fibers.

[0097] In this specific embodiment, the reinforcing layer is prepared by mixing steel wire and glass carbon fiber. The thermal expansion coefficient of the steel wire is much larger than that of the ceramic fiber. Among the glass carbon fibers, the thermal expansion coefficient of the glass fiber is close to that of the ceramic fiber, and the thermal expansion coefficient of the carbon fiber is much smaller than that of the ceramic fiber. The present invention determines the thickness ratio of the reinforcing layer and the thermal insulation layer by the ratio of the interweaving density of the steel wire to the interweaving density of the glass carbon fiber, which can make the thermal expansion coefficient more evenly distributed inside the material, reduce thermal stress concentration and thermal fatigue, improve the durability of the hose, make the expansion and contraction of the drilling hose at different temperatures more coordinated, and maintain the stability of the overall structure.

[0098] In some preferred embodiments, the thickness ratio of the reinforcement layer to the heat insulation layer is calculated according to the following formula:

[0099] .

[0100] in, is the interweaving density of steel wires, in root / ;

[0101] is the interweaving density of glass fiber, the unit is root / ;

[0102] and are the thickness of the reinforcement layer and the insulation layer, respectively, in units of ;

[0103] c It is the mass ratio of carbon fiber to glass fiber in glass fiber, and the unit is 1.

[0104] Example 1

[0105] The embodiment provides a high-pressure fire-resistant drilling hose, which includes, from inside to outside:

[0106] Inner rubber layer 1, reinforcement layer 2, outer rubber layer 3 and thermal insulation layer 4;

[0107] Among them, the inner rubber layer 1 is fluororubber; the reinforcement layer 2 is composed of 4 layers of mixed layers of steel wire and glass fiber; the outer rubber layer 3 is chloroprene rubber; and the heat insulation layer 4 is ceramic fiber.

[0108] Among them, the reinforcement layer 2 is mixed with steel wire as warp and glass fiber as weft; the weaving angle θ Determined according to the tension requirements of the steel wire and the glass fiber.

[0109] The braiding angle is calculated according to the following formula:

[0110] .

[0111] in, The tension requirement of the steel wire is ;

[0112] is the tension requirement of the glass fiber. ;

[0113] is the diameter of the steel wire, which is 0.3 mm;

[0114] is the diameter of the glass fiber, which is 0.15mm;

[0115] is the interweaving density of the steel wires, which is 3 wires / cm;

[0116] is the interweaving density of glass fiber, which is 4 strands / cm;

[0117] but is the braiding angle, and the calculated result is 48.19°.

[0118] The interweaving density of the steel wires and the interweaving density of the glass fiber are calculated according to the genetic algorithm model.

[0119] Among them, the fitness function used by the genetic algorithm model is:

[0120] .

[0121] in, It is the compressive strength of the combination of steel wire interlacing density and glass fiber interlacing density;

[0122] It is the flexibility of the combination of steel wire interweaving density and glass fiber interweaving density;

[0123] and are the weights of compression resistance and flexibility respectively.

[0124] The genetic algorithm model is used to calculate the interweaving density of steel wires and the interweaving density of glass fiber, including the following steps:

[0125] S1. Collect data, including: target value of compressive strength, target value of flexibility, interweaving density range of steel wire and interweaving density range of glass fiber;

[0126] S2. Initial population generation: Generate an initial population. Each individual represents a density combination, where the interweaving density of the steel wire is , the interweaving density of glass fiber is , each individual i Expressed as ;

[0127] S3, design a fitness function to calculate the fitness of each individual based on stress resistance and flexibility;

[0128] S4, selection, using roulette selection method or tournament selection method to select individuals with higher fitness from the current population for reproduction;

[0129] S5, crossover, performing crossover operation on the selected individuals to generate new individuals;

[0130] S6, mutation, mutation operation is performed on the individuals after crossover to increase the diversity of the population;

[0131] S7. New population generation, using newly generated individuals to replace individuals with lower fitness to form a new population.

[0132] S8, iteration, repeating steps S4 to S7 until the maximum number of iterations is reached or the fitness function converges, and the optimal steel wire interlacing density and glass fiber interlacing density are obtained.

[0133] In this embodiment, the weight of the stress resistance and the weight of flexibility , meeting the following conditions: Calculated from the inside to the outside, in the 1st and 2nd layers of steel wire and glass fiber mixed layers, ; In the 3rd to 4th layers of steel wire and glass fiber mixed layers, .

[0134] The mass ratio of glass fiber to carbon fiber in glass fiber is 1:2.

[0135] Ceramic fiber, calculated by weight, includes the following components:

[0136] 65 parts of fused chromium oxide, 8 parts of aluminum oxide powder, 0.3 parts of europium oxide powder and 5 parts of binder; the ratio of the average particle size of the fused chromium oxide to the average particle size of the aluminum oxide powder is 100.

[0137] The thickness ratio of the reinforcement layer to the insulation layer is calculated according to the following formula:

[0138] .

[0139] in, is the interweaving density of steel wires, in root / ;

[0140] is the interweaving density of glass fiber, the unit is root / ;

[0141] and are the thickness of the reinforcement layer and the insulation layer, respectively, in units of ;

[0142] c It is the mass ratio of carbon fiber to glass fiber in glass fiber, and the unit is 1.

[0143] but .

[0144] Comparative Example 1

[0145] The embodiment provides a high-pressure fire-resistant drilling hose, which includes, from inside to outside:

[0146] Inner rubber layer 1, reinforcement layer 2, outer rubber layer 3 and thermal insulation layer 4;

[0147] Among them, the inner rubber layer 1 is fluororubber; the reinforcement layer 2 is made of 4 layers of steel wire braiding; the outer rubber layer 3 is chloroprene rubber; and the heat insulation layer 4 is ceramic fiber.

[0148] Among them, the diameter of the steel wire is 0.3mm; the interlacing density of the steel wire is 3 wires / cm; The braiding angle is 48.19°.

[0149] Ceramic fiber, calculated by weight, includes the following components:

[0150] 65 parts of fused chromium oxide, 8 parts of aluminum oxide powder, 0.3 parts of europium oxide powder and 5 parts of binder; the ratio of the average particle size of the fused chromium oxide to the average particle size of the aluminum oxide powder is 100.

[0151] The thickness ratio of the reinforcement layer to the thermal insulation layer is 1.5.

[0152] Comparative Example 2

[0153] The embodiment provides a high-pressure fire-resistant drilling hose, which includes, from inside to outside:

[0154] Inner rubber layer 1, reinforcement layer 2, outer rubber layer 3 and thermal insulation layer 4;

[0155] The inner rubber layer 1 is fluororubber; the reinforcing layer 2 is made of 4 layers of glass fiber weaving; the outer rubber layer 3 is chloroprene rubber; and the heat insulation layer 4 is ceramic fiber.

[0156] Among them, the diameter of the glass carbon fiber is 0.15mm; the interweaving density of the glass carbon fiber is 4 strands / cm; The braiding angle is 48.19°.

[0157] Ceramic fiber, calculated by weight, includes the following components:

[0158] 65 parts of fused chromium oxide, 8 parts of aluminum oxide powder, 0.3 parts of europium oxide powder and 5 parts of binder; the ratio of the average particle size of the fused chromium oxide to the average particle size of the aluminum oxide powder is 100.

[0159] The thickness ratio of the reinforcement layer to the thermal insulation layer is 1.5.

[0160] Comparative Example 3

[0161] The embodiment provides a high-pressure fire-resistant drilling hose, which includes, from inside to outside:

[0162] Inner rubber layer 1, reinforcement layer 2, outer rubber layer 3 and thermal insulation layer 4;

[0163] Among them, the inner rubber layer 1 is fluororubber; the reinforcement layer 2 is composed of 4 layers of mixed layers of steel wire and glass fiber; the outer rubber layer 3 is chloroprene rubber; and the heat insulation layer 4 is ceramic fiber.

[0164] Among them, the reinforcement layer 2 is mixed with steel wire as warp and glass fiber as weft; the weaving angle The angle is set to 60°. The remaining technical solutions are the same as those in Example 1.

[0165] Comparative Example 4

[0166] The embodiment provides a high-pressure fire-resistant drilling hose, which includes, from inside to outside:

[0167] Inner rubber layer 1, reinforcement layer 2, outer rubber layer 3 and thermal insulation layer 4;

[0168] Among them, the thickness ratio of the reinforcement layer 2 to the heat insulation layer 4 is 1, and the rest of the technical scheme is the same as Example 1.

[0169] Performance Testing

[0170] The drilling hoses of Example 1 and Comparative Examples 1 to 4 were subjected to pressure resistance test, tensile strength test and fatigue resistance test. The test results are shown in Table 1.

[0171] The test method is as follows:

[0172] Pressure test: Apply a pressure of 100MPa to the drilling hose for 1 hour to test the change rate of the inner diameter of the drilling hose compared to before the test.

[0173] Tensile strength test: The reference standard is ASTM D412, and a tensile testing machine is used to test the tensile strength of the reinforcement layer in the longitudinal and transverse directions.

[0174] Fatigue resistance test: Test the change rate of tensile strength of drilling hose before and after 1000 repeated bending.

[0175] Table 1. Drilling hose performance test results

[0176]

[0177] According to the above test results:

[0178] 1. The reinforcement layer formed by mixing steel wire and glass-carbon fiber provided by the present invention can greatly improve the mechanical properties of the drilling hose compared with the reinforcement layer formed by using steel wire or glass-carbon fiber alone.

[0179] 2. The braiding method and braiding angle provided by the present invention can improve the mechanical properties of the drilling hose to a certain extent.

[0180] 3. The thickness ratio of the reinforcing layer to the heat insulating layer provided by the present invention can optimize the internal structure of the drilling hose and improve the pressure resistance and fatigue resistance of the drilling hose.

[0181] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been presented as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A high-pressure fire-resistant drilling hose, characterized in that: The drilling hose comprises, from inside to outside: Inner rubber layer, reinforcement layer, outer rubber layer and thermal insulation layer; The inner rubber layer is fluororubber; the reinforcement layer is composed of 1 to 4 layers of steel wire and glass fiber mixed layer; the outer rubber layer is chloroprene rubber; the heat insulation layer is ceramic fiber; The reinforcing layer is mixed with steel wire as warp and glass fiber as weft; Among them, the braiding angle is 48.19°; In the glass fiber, the mass ratio of glass fiber to carbon fiber is 1:(1-2); The thickness ratio of the reinforcement layer to the thermal insulation layer is 1.

5.

2. A high pressure fire resistant drilling hose according to claim 1, characterized in that: The ceramic fiber, calculated by weight, includes the following components: 65-85 parts of fused chromium oxide, 8-15 parts of aluminum oxide powder, 0.3-0.8 parts of europium oxide powder and 5-8 parts of binder.

3. A high pressure fire resistant drilling hose according to claim 2, characterized in that: The ratio of the average particle size of the fused chromium oxide to the average particle size of the alumina powder is 50-150.

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