High-pressure flexible hose assembly for fracturing operation

Abstract

The utility model relates to a high-pressure flexible hose assembly for fracturing operation. The high-pressure flexible hose assembly comprises a connector and a hose. Wherein the joint comprises an inner core body and a middle sleeve, and the hose comprises an inner rubber layer, a steel wire winding layer and a UPE wear-resistant sealing layer; the first end of the inner core body penetrates into an inner hole of the hose from the end of the hose, and the middle sleeve located on the outer side of the inner core body is connected with the outer side of the steel wire winding layer in a buckling and pressing mode. The inner rubber layer located on the inner side of the steel wire winding layer is connected with the first sealing section of the inner core body in a sealed mode, and the UPE abrasion-resistant sealing layer located on the inner side of the inner rubber layer is connected with the second sealing section of the inner core body in a sealed mode. Compared with the prior art, according to the technical scheme, the sealing performance and the abrasion resistance of the hose can be effectively improved in a double-section sealing mode, so that the service life is prolonged, and the leakage risk is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hoses and hose connections, and in particular to a high-pressure flexible hose assembly for fracturing operations. BACKGROUND

[0002] In the production process of oil and gas wells in the oil industry, fracturing operations are one of the common operations, which involve transporting a large amount of fracturing sand to a designated location, and at the same time, hydrochloric acid needs to be transported for acidizing the downhole formation; traditionally, steel pipes are used as the transport channel to withstand the high-pressure driving and high-speed moving sand flow; however, this transport pipeline system composed of steel pipes and metal pipe joints has certain defects, the main problem being that the steel pipe has a large weight and rigidity, which limits the layout of the fracturing equipment, and it is very troublesome to carry, install and disassemble.

[0003] In order to solve these problems, high-pressure flexible hoses have begun to be used in the prior art to replace steel pipes for fracturing operations; high-pressure flexible hoses have a wide range of applications in acidizing fracturing, sand fracturing and hydraulic fracturing pipelines, etc. in well completion operations, and can transport different types of fracturing fluids such as water-based fluid, oil-based fluid, foam fluid and acid-based fluid, etc. under high pressure, and the transport pressure can currently reach 20000 psi (137.9 MPa), and this flexible pipeline system greatly improves the flexibility of the operation and reduces the weight and installation difficulty.

[0004] However, there are still certain technical problems in the use of existing high-pressure flexible hoses. In particular, the buckling high-pressure flexible hose is composed of a rubber hose and a metal joint fixed at both ends of the rubber hose, and the sealing performance between the rubber hose and the joint is crucial to the overall quality of the hose; in some prior art, a single rubber inside the rubber hose is used to seal with the metal joint by buckling, and due to the poor sealing effect, the connection between the rubber hose and the joint leaks due to the poor wear resistance of the rubber during actual operation, which affects the safety and reliability of the operation. CONTENT OF THE INVENTION

[0005] The present application provides a high-pressure flexible hose assembly for fracturing operations, which can effectively improve the sealing performance and wear resistance, thereby reducing the risk of leakage.

[0006] In a first aspect, the application provides a high-pressure flexible hose assembly for fracturing operation, comprising: a joint and a hose; wherein the joint comprises an inner core and a middle sleeve, and the hose comprises an inner rubber layer, a steel wire winding layer and a UPE wear-resistant sealing layer; a first end of the inner core is inserted into an inner hole of the hose from an end of the hose, the middle sleeve outside the inner core is connected with the outside of the steel wire winding layer in a clamping manner, the inner rubber layer inside the steel wire winding layer is connected with a first sealing section of the inner core in a sealing manner, and the UPE wear-resistant sealing layer inside the inner rubber layer is connected with a second sealing section of the inner core in a sealing manner.

[0007] In a possible implementation, the inner core is provided with an inner core inner rubber sealing protrusion at the first sealing section, and is provided with a UPE section sealing protrusion at the second sealing section; and the inner core is provided with an inner core locking protrusion at the locking section.

[0008] In a possible implementation, the inner core inner rubber sealing protrusion, the UPE section sealing protrusion and the inner core locking protrusion are annular barb-shaped protrusions, and / or the inner core inner rubber sealing protrusion, the UPE section sealing protrusion and the inner core locking protrusion are trapezoidal protrusions.

[0009] In a possible implementation, the locking section on the inner core is connected with the first sealing section, and the first sealing section is connected with the second sealing section; when the first end of the inner core is inserted into the inner hole of the hose from the end of the hose, the locking section is located at an end region of the hose, and the second sealing section is located at a first end region of the inner core.

[0010] In a possible implementation, the middle sleeve is provided with a middle sleeve sealing protrusion inside; when the middle sleeve is connected with the outside of the steel wire winding layer in a clamping manner, the middle sleeve sealing protrusion on the middle sleeve extrudes the outside of the steel wire winding layer, and the inner rubber layer inside the steel wire winding layer is connected with the first sealing section of the inner core in a sealing manner by being extruded by the steel wire winding layer.

[0011] In a possible implementation, the middle sleeve is further provided with a middle sleeve locking protrusion inside; when the middle sleeve is connected with the outside of the steel wire winding layer in a clamping manner, the middle sleeve locking protrusion on the middle sleeve extrudes the outside of the steel wire winding layer, and the inside of the steel wire winding layer is connected with the locking section of the inner core in a clamping manner.

[0012] In a possible implementation, the joint further comprises an outer sleeve; the outer sleeve is arranged outside the middle sleeve, and the outer sleeve is connected with the middle sleeve in a clamping manner.

[0013] In a possible implementation, the hose further comprises an outer rubber layer and a rubberized cord layer; the rubberized cord layer is connected to the outer side of the steel wire winding layer, and the outer rubber layer is connected to the outer side of the rubberized cord layer.

[0014] In a possible implementation, the UPE wear-resistant sealing layer has a thickness of 1-3 mm, is wound by a single layer of UPE film with a thickness of 0.15-0.25 mm, and has 4-20 layers.

[0015] In a possible implementation, the UPE wear-resistant sealing layer and the inner rubber layer have deformability.

[0016] Compared with the prior art, the above technical solution provided by the embodiments of the present application has the following advantages:

[0017] The high-pressure flexible hose assembly for fracturing operation provided by the embodiments of the present application comprises a joint and a hose; the joint comprises an inner core body and a middle sleeve, and the hose comprises an inner rubber layer, a steel wire winding layer and a UPE wear-resistant sealing layer; the first end of the inner core body penetrates into the inner hole of the hose from the end of the hose, the middle sleeve located on the outer side of the inner core body is in press-fit connection with the outer side of the steel wire winding layer, the inner rubber layer located on the inner side of the steel wire winding layer is in sealing connection with the first sealing section of the inner core body, and the UPE wear-resistant sealing layer located on the inner side of the inner rubber layer is in sealing connection with the second sealing section of the inner core body; compared with the prior art, in the technical solution of the present application, the middle sleeve is in press-fit connection with the outer side of the steel wire winding layer, this press-fit mode can make the joint and the hose tightly combined, thereby enhancing the sealing performance of the connection part and ensuring that no leakage occurs under high-pressure working conditions; the UPE wear-resistant sealing layer has excellent wear resistance, and cooperates with the inner rubber layer to enhance the overall wear resistance of the hose; meanwhile, the inner rubber layer is in sealing connection with the first sealing section of the inner core body, and the UPE wear-resistant sealing layer is in sealing connection with the second sealing section of the inner core body, thereby forming double sealing, which can effectively improve the sealing performance compared with the press-fit sealing of the inner rubber of the single rubber tube and the metal joint. BRIEF DESCRIPTION OF DRAWINGS

[0018] The drawings incorporated into the specification and forming a part thereof, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application.

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows, and obviously, other drawings can also be obtained by those skilled in the art without any creative labor based on these drawings.

[0020] One or more embodiments are illustrated by way of example in the drawings and described herein in connection with the appended drawings, which are incorporated herein by reference. The drawings, which are not necessarily to scale, depict one or more embodiments and are not intended to limit the scope of the application. In the drawings, like reference numbers generally indicate like elements. The drawings are not intended to limit the scope of the application.

[0021] Figure 1 A structural schematic diagram of a high-pressure flexible hose assembly for fracturing operation provided by an embodiment of the present application;

[0022] Figure 2 A structural schematic diagram of a joint and a hose provided by an embodiment of the present application;

[0023] Figure 3 Another structural schematic diagram of a high-pressure flexible hose assembly for fracturing operation provided by an embodiment of the present application;

[0024] Figure 4 A joint schematic diagram provided by an embodiment of the present application;

[0025] Figure 5 A deformation schematic diagram of an inner rubber layer and a UPE wear-resistant sealing layer provided by an embodiment of the present application. DETAILED DESCRIPTION

[0026] In order to make the objects, technical schemes and advantages of the embodiments of the present application clearer, the technical schemes in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0027] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplifying the present application, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to reference numbers and / or letters in different examples. Such repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or settings discussed.

[0028] For the convenience of description, spatial relative terms can be used in the specification to describe the relative position relationship or movement of one element or feature with respect to another element or feature as shown in the drawings, such as "inner", "outer", "inboard", "outboard", "under", "below", "on", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawings is turned over or reversed, or the orientation of the device changes or the movement state changes, the directional indications also change accordingly, for example: the element described as "under" or "below" another element or feature will be oriented as "above" or "above" another element or feature. Therefore, the example term "below" can include both upward and downward positions. The device can be additionally oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used in the specification are interpreted accordingly.

[0029] Figure 1 A structural schematic diagram of a high-pressure flexible hose assembly for fracturing operation is provided for the embodiments of the present application; as shown in the figure, the high-pressure flexible hose assembly for fracturing operation comprises a joint 10 and a hose 20, specifically as follows: Figure 1

[0030] In an embodiment, the joint 10 is fixed to both ends of the hose 20 for sealed connection with the hose 20; as shown in the figure, Figure 2 Figure 2 A structural schematic diagram of a joint and a hose is provided for the embodiments of the present application.

[0031] Preferably, the joint 10 includes but is not limited to a flange joint, a by joint or other structural joint.

[0032] As shown in the figure, Figure 3 Figure 3 Another structural schematic diagram of a high-pressure flexible hose assembly for fracturing operation is provided for the embodiments of the present application.

[0033] In an embodiment, the joint 10 comprises an inner core 100 and a middle sleeve 101.

[0034] Specifically, the joint 10 further comprises an outer sleeve 102.

[0035] Specifically, the outer sleeve 102 is arranged outside the middle sleeve 101; the outer sleeve 102 is connected with the middle sleeve 101 by buckling, and the outer sleeve 102 is fixed outside the middle sleeve 101 by buckling deformation, thereby strengthening the middle sleeve 101.

[0036] ​​​Specifically, the middle sleeve 101 is arranged outside the inner core body 100; the middle sleeve 101 is extruded and deformed by the buckling of the outer sleeve 102 to be fixed outside the inner core body 100.

[0037] Specifically, a first gap space is arranged between the middle sleeve 101 and the inner core body 100.

[0038] In an embodiment, the hose 20 comprises an inner rubber layer 200, a steel wire winding layer 201 and a UPE wear-resistant sealing layer 202.

[0039] Specifically, the hose 20 further comprises an outer rubber layer 203 and a rubber-coated cord layer 204.

[0040] Specifically, the UPE wear-resistant sealing layer and the inner rubber layer have deformability.

[0041] Specifically, the hose 20 is sequentially arranged from inside to outside as the UPE wear-resistant sealing layer 202, the inner rubber layer 200, the steel wire winding layer 201, the rubber-coated cord layer 204 and the outer rubber layer 203.

[0042] Specifically, the inner side of the outer rubber layer 203 is connected with the outer side of the rubber-coated cord layer 204, the inner side of the rubber-coated cord layer 204 is connected with the outer side of the steel wire winding layer 201, the inner side of the steel wire winding layer 201 is connected with the outer side of the inner rubber layer 200, and the inner side of the inner rubber layer 200 is connected with the UPE wear-resistant sealing layer 202.

[0043] Specifically, UPE is ultra-high molecular weight polyethylene, which has very excellent wear resistance; in the hose, it is located at the innermost side and directly contacts with the transported fluid; the design aims to avoid the wear of the sealing system caused by the sand and other solid particles in the fracturing fluid during the flow process; due to its good wear resistance, even in the fracturing operation, it can effectively reduce the damage to the sealing structure and prolong the service life of the hose even if it is exposed to the fluid environment containing sand for a long time.

[0044] Specifically, the thickness of the UPE wear-resistant sealing layer 202 is 1mm-3mm, the UPE wear-resistant sealing layer 202 is wound by a single layer of UPE film with a thickness of 0.15-0.25mm, and the number of winding layers is 4-20; by controlling the thickness and the number of winding layers, the sealing effect can be optimized to ensure that the hose can withstand high pressure while reducing the risk of leakage caused by wear.

[0045] In an embodiment, the first end of the inner core 100 penetrates into the inner hole of the hose 20 from the end of the hose, the middle sleeve 101 outside the inner core 100 is buckled and connected with the outside of the steel wire winding layer 201, the inner rubber layer 200 inside the steel wire winding layer 201 is sealed and connected with the first sealing section of the inner core 100, and the UPE wear-resistant sealing layer 202 inside the inner rubber layer 200 is sealed and connected with the second sealing section of the inner core 100.

[0046] Specifically, the connection between the joint 10 and the hose 20 is realized by penetrating the first end of the inner core 100 into the inner hole of the hose 20 from the end of the hose 20, and the first gap space in the joint 10 is used to place the hose 20.

[0047] As shown in Figure 4 , Figure 4 , the joint schematic diagram provided by the embodiment of the application is shown.

[0048] In an embodiment, the inner core 100 is provided with the locking section S1, the first sealing section S2 and the second sealing section S3.

[0049] Specifically, the locking section S1 on the inner core 100 is connected with the first sealing section S2, and the first sealing section S2 is connected with the second sealing section S3.

[0050] Specifically, when the first end of the inner core 100 penetrates into the inner hole of the hose 20 from the end of the hose 20, the locking section S1 is located at the end region of the hose 20, and the second sealing section S3 is located at the first end region of the inner core 100.

[0051] Specifically, the inner core 100 is provided with an inner core inner rubber sealing protrusion S20 at the first sealing section S2, is provided with a UPE section sealing protrusion S30 at the second sealing section S3, and is provided with an inner core locking protrusion S10 at the locking section S1.

[0052] Specifically, the inner core inner rubber sealing protrusion, the UPE section sealing protrusion and the inner core locking protrusion can be annular barb-shaped protrusions or trapezoidal protrusions.

[0053] Specifically, when the inner rubber layer 200 is buckled, it is in contact and extrusion with the inner core inner rubber sealing protrusion S20 provided at the first sealing section S2 of the inner core 100, so as to form a first section sealing at the first sealing section S2 of the inner core 100.

[0054] Specifically, the UPE wear-resistant sealing layer 201 is in contact and buckled with the UPE segment sealing protrusion S30 arranged at the second sealing segment S3 of the inner core body 100 when buckled, so as to form a second segment sealing at the second sealing segment S3 of the inner core body 100.

[0055] Specifically, the sealing segment of the inner core body 100 is divided into a first sealing segment S2 and a second sealing segment S3 through structural modification, the inner core body 100 is sealed with the inner rubber layer 200 of the hose in the first sealing segment S2, the inner core body 100 is provided with a sealing segment of the UPE wear-resistant inner lining layer 201 on the inner side of the inner rubber layer 200 in the second sealing segment S3, and the inner core body inner rubber sealing protrusion S20 and the UPE segment sealing protrusion S30 are arranged at the first sealing segment S2 and the second sealing segment S3 respectively, so as to form a double-segment sealing structure. Under high-pressure environment, this design can provide redundant sealing protection. When the first sealing segment S2 has a slight leakage risk due to long-term use or accidental impact, the second sealing segment S3 can still function, effectively reducing the overall leakage possibility, greatly improving the sealing reliability of the hose in the fracturing operation, ensuring that the transported fracturing fluid and other substances will not leak, and ensuring the safe and efficient operation. Moreover, the effective sealing of the UPE wear-resistant sealing layer 201 and the second sealing segment S3 of the inner core body 100 utilizes the super wear-resistant performance of the UPE material. In the harsh working conditions of the fracturing fluid containing sand and other particulate matters, the rubber is no longer in contact with the fracturing fluid after the UPE wear-resistant inner lining layer is directly used for sealing with the inner core body, the UPE wear-resistant sealing layer 201 can effectively resist the wear of sand and gravel, protect the sealing structure, reduce the risk of sealing failure caused by wear, and thus prolong the overall service life of the high-pressure flexible hose.

[0056] Specifically, the locking segment S1 is arranged on the inner core body 100, and the inner core body locking protrusion S10 is arranged on the locking segment S1 of the inner core body 100, which is buckled and connected with the steel wire winding layer 201, so that the steel wire winding layer 201 is tightly fixed on the inner core body.

[0057] Specifically, in the fracturing operation, the hose 20 will be subjected to various external forces, such as vibration, stretching and twisting, etc. This locking connection mode can effectively prevent the relative displacement between the inner core body 100 and the steel wire winding layer 201, ensure the integrity and stability of the entire structure, maintain the normal working state of the hose, and avoid faults and safety hazards caused by loose connection.

[0058] In an embodiment, the inner side of the middle sleeve 101 is provided with a middle sleeve sealing protrusion S40.

[0059] Specifically, when the middle sleeve 101 is buckled and pressed on the outer side of the steel wire winding layer 201, the middle sleeve sealing protrusion S40 on the middle sleeve 101 extrudes the outer side of the steel wire winding layer 201, and the inner rubber layer 200 on the inner side of the steel wire winding layer 201 is extruded by the steel wire winding layer 201 and sealed with the first sealing section S1 of the inner core body 100. Because of the transmission of pressure, the inner rubber layer 200 will be further compacted, thereby better adhering to the inner core body inner rubber sealing protrusion S20 on the first sealing section S2 of the inner core body 100, eliminating possible small gaps and forming a more airtight seal. In a high-pressure environment, this tight sealing connection helps to prevent the leakage of fluids such as fracturing fluid from the connection between the inner rubber layer 200 and the inner core body 100, ensuring the sealing performance of the hose 20 and avoiding interruptions or safety accidents caused by sealing failure.

[0060] In an embodiment, the inner side of the middle sleeve 101 is further provided with a middle sleeve locking protrusion S50.

[0061] Specifically, when the middle sleeve 101 is buckled and pressed on the outer side of the steel wire winding layer 201, the middle sleeve locking protrusion S50 on the middle sleeve 101 extrudes the outer side of the steel wire winding layer 201, and the inner side of the steel wire winding layer 201 is buckled and pressed with the locking section S1 of the inner core body 100. This structural design makes the connection between the middle sleeve 101 and the inner core body 100 more secure through the steel wire winding layer 201. In actual application, such as fracturing operations of oil and gas wells, the hose will be subjected to various complex external forces, including but not limited to stretching, bending, vibration, and internal fluid pressure. Through the extrusion of the middle sleeve locking protrusion S50, the sliding or displacement of the steel wire winding layer 201 relative to the middle sleeve 101 and the inner core body 100 can be prevented, ensuring the stability of the overall structure and avoiding loose connection caused by relative movement between components, thereby ensuring the structural integrity of the high-pressure flexible hose during long-term use.

[0062] In an embodiment, the working principle of the double-segment sealing structure is as follows: when buckled and pressed, the middle sleeve locking protrusion S50 and the middle sleeve sealing protrusion S40 on the inner side surface of the middle sleeve 101 extrude the steel wire winding layer 201 inside, the steel wire winding layer 201 further extrudes the inner rubber layer 200, the inner rubber layer 200 first contacts and extrudes the inner core body inner rubber sealing protrusion S20 in the first sealing section S2 of the inner core body 100 to cause the inner rubber layer 200 to deform and form a first segment sealing layer, and then after the action continues to buckle, the UPE segment sealing protrusion S30 in the second sealing section S3 of the inner core body 100 begins to contact and extrude the UPE wear-resistant sealing layer 201 to cause the UPE wear-resistant sealing layer 201 to deform and form a second segment sealing layer. Thus, a double-segment sealing is achieved. Figure 5 Figure 5 ​A deformation schematic diagram of the inner rubber layer and the UPE wear-resistant sealing layer provided in the embodiment of the present application.

[0063] In summary, the high-pressure flexible hose assembly for fracturing operation provided in the embodiment of the present application has the UPE wear-resistant sealing layer added in the rubber hose. When the rubber hose and the interface are sealingly connected, the inner rubber layer located inside the steel wire winding layer is sealingly connected with the first sealing section of the inner core body, and the UPE wear-resistant sealing layer located inside the inner rubber layer is sealingly connected with the second sealing section of the inner core body. The double-section sealing improves the pressure-bearing capacity of the connection between the rubber hose and the joint. Meanwhile, in the process of fracturing operation, the UPE has strong wear resistance, which avoids the wear of the sealing layer by sand and gravel in the fracturing fluid, improves the sealing life of the fracturing hose, increases the service life of the fracturing hose, and reduces the probability of leakage.

[0064] In the above embodiments, the description of each embodiment has its own focus. The parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0065] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0066] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0067] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be connected, or detachable, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0068] In the present application, unless specifically defined otherwise, the expression "on" or "under" of a first feature with respect to a second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the expression "on", "above" and "over" of a first feature with respect to a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The expression "under", "below" and "underneath" of a first feature with respect to a second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0069] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, a person skilled in the art can combine and combine different embodiments or examples described in the present specification.

[0070] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, any modifications and variations of the present application that fall within the scope of the claims of the present application and their equivalents are intended to be included in the present application.

[0071] The above is a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A high-pressure flexible hose assembly for fracturing operations, characterized in that, include: Connectors and hoses; The connector includes an inner core and a middle sleeve, and the hose includes an inner rubber layer, a steel wire winding layer and a UPE wear-resistant sealing layer. The first end of the inner core is inserted into the inner hole of the hose from the end of the hose. The middle sleeve located on the outside of the inner core is crimped to the outside of the wire winding layer. The inner rubber layer located on the inside of the wire winding layer is sealed to the first sealing section of the inner core. The UPE wear-resistant sealing layer located on the inside of the inner rubber layer is sealed to the second sealing section of the inner core.

2. The high-pressure flexible hose assembly for fracturing operations according to claim 1, characterized in that, The inner core is provided with an inner core internal rubber sealing protrusion in the first sealing section, and the inner core is provided with a UPE section sealing protrusion in the second sealing section; the inner core is provided with an inner core locking protrusion in the locking section.

3. The high-pressure flexible hose assembly for fracturing operations according to claim 1, characterized in that, The inner core internal rubber sealing protrusion, the UPE section sealing protrusion, and the inner core locking protrusion are annular barbed protrusions, and / or, the inner core internal rubber sealing protrusion, the UPE section sealing protrusion, and the inner core locking protrusion are trapezoidal protrusions.

4. The high-pressure flexible hose assembly for fracturing operations according to claim 2, characterized in that, The locking section on the inner core is connected to the first sealing section, and the first sealing section is connected to the second sealing section; When the first end of the inner core passes through the inner hole of the hose from the end of the hose, the locking section is located in the end region of the hose, and the second sealing section is located in the first end region of the inner core.

5. The high-pressure flexible hose assembly for fracturing operations according to claim 1, characterized in that, The inner side of the middle sleeve is provided with a middle sleeve sealing protrusion; When the middle sleeve is pressed into the outer side of the wire winding layer, the middle sleeve sealing protrusion on the middle sleeve presses against the outer side of the wire winding layer, and the inner rubber layer on the inner side of the wire winding layer is pressed against the wire winding layer and sealed to the first sealing section of the inner core.

6. The high-pressure flexible hose assembly for fracturing operations according to claim 2, characterized in that, The inner side of the middle sleeve is also provided with a middle sleeve locking protrusion; When the middle sleeve is pressed into the outer side of the wire winding layer, the locking protrusion on the middle sleeve presses against the outer side of the wire winding layer, and the inner side of the wire winding layer is pressed into the locking section of the inner core.

7. The high-pressure flexible hose assembly for fracturing operations according to claim 1, characterized in that, The connector also includes an outer sleeve; The outer sleeve is disposed on the outside of the middle sleeve, and the outer sleeve is snapped together with the middle sleeve.

8. The high-pressure flexible hose assembly for fracturing operations according to claim 1, characterized in that, The hose also includes an outer rubber layer and a rubber-coated fabric layer; The adhesive-coated curtain fabric layer is connected to the outer side of the wire winding layer, and the outer adhesive layer is connected to the outer side of the adhesive-coated curtain fabric layer.

9. The high-pressure flexible hose assembly for fracturing operations according to claim 1, characterized in that, The thickness of the UPE wear-resistant sealing layer is 1mm-3mm, and the UPE wear-resistant sealing layer is made by winding a single layer of UPE film with a thickness of 0.15-0.25mm, with 4-20 winding layers.

10. The high-pressure flexible hose assembly for fracturing operations according to claim 1, characterized in that, The UPE wear-resistant sealing layer and the inner adhesive layer are deformable.

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