Fastening-free full-bore acid fracturing hose assembly

Abstract

The utility model relates to the technical field of hose connectors, in particular to a buckling-free full-bore acid fracturing hose assembly which comprises a hose and a connector. The hose sequentially comprises a lining layer, a framework layer and an outer rubber layer from inside to outside. The connector comprises a sleeve and a wedge-shaped sleeve, the sleeve is installed at the end of the hose, the outer rubber layer wraps the outer side of the sleeve, the inner diameter of the sleeve is equal to the inner diameter of the lining layer, an anti-pulling-off hole is formed in the sleeve and is a conical hole, and the diameter of the axial outer end of the conical hole is larger than that of the axial inner end of the conical hole. The outer side of the wedge-shaped sleeve is conical, the wedge-shaped sleeve is inserted into the inner ring of the framework layer, and the outer ring of the framework layer is embedded into the anti-pull-off hole. According to the utility model, the influence of a non-drift-diameter joint on the flow is reduced, and the pulling risk of the hose and the joint is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of hose joints, in particular to a buckle-free full-diameter acid fracturing hose assembly. Background Art

[0002] With the rapid development of the petroleum industry, acid fracturing technology, as an important means to increase the production of oil and gas wells, has increasingly stringent requirements on the performance of acid fracturing hoses. Existing acid fracturing hose assemblies mostly use crimping joints. Although this structure can meet the use requirements under normal pressure, under ultra-high pressure environments (above 20,000 PSI), its non-diameter characteristics, that is, the inner diameter of the joint is smaller than the inner diameter of the hose, limit the flow rate and affect the operating efficiency. Moreover, under ultra-high pressure, the hose is easily pulled out of the joint, reducing its service life. Utility Model Content

[0003] In view of the deficiencies in the prior art, the purpose of the embodiments of the utility model is to provide a full-diameter acid fracturing hose assembly that does not require buckling, thereby reducing the impact of non-diameter joints on flow and reducing the risk of the hose and joint being pulled out.

[0004] In order to achieve the above purpose, the embodiment of the utility model provides the following technical solutions:

[0005] A buckle-free full-bore acid fracturing hose assembly comprises: a hose and a joint; the hose comprises an inner lining layer, a skeleton layer and an outer rubber layer from the inside to the outside in sequence; the joint comprises a sleeve and a wedge sleeve, the sleeve is installed at the end of the hose, the outer rubber layer is coated on the outside of the sleeve, the inner diameter of the sleeve is equal to the inner diameter of the inner lining layer, an anti-pull-out hole is arranged in the sleeve, the anti-pull-out hole is a tapered hole, the diameter of the axial outer end of the tapered hole is larger than the diameter of the axial inner end; the outer side of the wedge sleeve is tapered, the wedge sleeve is inserted into the inner ring of the skeleton layer and the outer ring of the skeleton layer is embedded in the anti-pull-out hole.

[0006] One or more technical solutions provided in the embodiments of the present utility model have at least the following technical effects or advantages:

[0007] The hose assembly includes a hose and a joint. The joint includes a sleeve and a wedge sleeve. The sleeve is installed at the end of the hose, and the outer rubber layer is covered on the outside of the sleeve. An anti-pull-out hole is provided in the sleeve. The wedge sleeve is pushed into the hose by relying on the step surface of the sleeve's anti-pull-out hole, and the skeleton layer is expanded and filled into the sleeve's anti-pull-out hole. With the anti-pull-out hole having a small inside and a large outside cone, the hose and the joint are prevented from being pulled out, thereby ensuring the reliability of the hose under high pressure. Furthermore, the inner diameter of the sleeve is the same as the inner diameter of the inner lining layer, realizing a full-diameter form. Compared with the buckle-type connection structure, it not only improves the reliability of the connection, but also does not limit the flow rate, thereby ensuring the operating efficiency.

[0008] Additional advantages of the present invention will be given in the following description, and some will become apparent from the following description or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The drawings constituting part of the specification of the utility model are used to provide a further understanding of the utility model. The schematic embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an improper limitation of the utility model. In addition, the spacing or size between each other is exaggerated to show the position of each part, and the schematic diagram is used for illustration only.

[0010] Figure 1 This is an outline diagram of a hose assembly provided by an embodiment of the utility model;

[0011] Figure 2 It is a schematic diagram of a hose provided by an embodiment of the utility model;

[0012] Figure 3 This is a schematic diagram of the cooperation between the hose and the connector provided in the embodiment of the utility model;

[0013] Figure 4 It is a schematic diagram of a sleeve provided in an embodiment of the utility model;

[0014] Figure 5 It is a schematic diagram of an inner wedge-shaped sleeve provided in an embodiment of the utility model;

[0015] Figure 6 It is a schematic diagram of an outer wedge-shaped sleeve provided in an embodiment of the utility model;

[0016] Figure 7 It is a schematic diagram of a sealing sleeve provided by an embodiment of the utility model;

[0017] Figure 8 It is a schematic diagram of a compression sleeve provided by an embodiment of the utility model;

[0018] Fig. 9 It is a schematic diagram of a hose without an outer rubber layer provided in an embodiment of the utility model;

[0019] Fig.10 This is a schematic diagram of hose cutting provided by an embodiment of the utility model;

[0020] Fig.11 This is a schematic diagram of the installation of the pressing sleeve, the wedge sleeve and the sealing sleeve provided in the embodiment of the utility model;

[0021] Fig.12 This is a schematic diagram of the installation sleeve provided by the embodiment of the utility model;

[0022] Fig.13 This is a schematic diagram of the sleeve and the compression sleeve provided in the embodiment of the utility model after being connected;

[0023] Fig.14 This is a schematic diagram of the embodiment of the utility model after the outer glue is coated;

[0024] In the figure: 1. Hose; 11. Inner lining; 12. Inner rubber layer; 13. Inner cord layer; 14. Steel wire layer; 15. Middle rubber layer; 16. Outer cord layer; 17. Outer rubber layer; 2. Joint; 21. Sleeve; 211. Threaded hole; 212. Glue injection hole; 213. Aligning hole; 214. First anti-pull-out hole; 215. Second anti-pull-out hole; 216. Sealing hole; 217. Inner coating; 218. External connecting section; 22. Inner wedge sleeve; 23. Outer wedge sleeve; 24. Press sleeve; 241. Cone; 242. External thread; 25. Protective net; 26. Sealing sleeve; DETAILED DESCRIPTION

[0025] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0026] like Figure 1 As shown in FIG. 1 , the full-bore acid fracturing hose assembly without buckling comprises a hose 1 and a connector 2. Figure 2 As shown, the hose 1 includes an inner lining layer 11, a skeleton layer and an outer rubber layer 17 from the inside to the outside. Figure 3 As shown, the connector 2 includes a sleeve 21 and a wedge sleeve. The sleeve 21 is installed at the end of the hose 1. The outer rubber layer 17 is coated on the outside of the sleeve 21. The inner diameter of the sleeve 21 is equal to the inner diameter of the inner lining layer 11. An anti-pull-out hole is provided in the sleeve 21. The anti-pull-out hole is a tapered hole. The diameter of the axial outer end of the tapered hole is larger than the diameter of the axial inner end. The axial outer end refers to Figure 3 Left side, inner end of axis Figure 3 The outer side of the wedge-shaped sleeve is conical, and the wedge-shaped sleeve is inserted into the inner ring of the skeleton layer and the outer ring of the skeleton layer is embedded in the anti-pull-out hole.

[0027] The hose assembly includes a hose 1 and a connector 2. The connector 2 includes a sleeve 21 and a wedge sleeve. The sleeve 21 is installed at the end of the hose 1, and the outer rubber layer 17 is covered on the outside of the sleeve 21. An anti-pull-out hole is provided in the sleeve 21. The wedge sleeve is pushed into the hose 1 by relying on the step surface of the anti-pull-out hole of the sleeve 21, and the skeleton layer is expanded and filled into the anti-pull-out hole of the sleeve 21. With the anti-pull-out hole having a small inside and a large outside taper, the hose 1 and the connector 2 are prevented from being pulled out, thereby ensuring the reliability of the hose 1 under high pressure. Furthermore, the inner diameter of the sleeve 21 is the same as the inner diameter of the inner lining layer 11, realizing a full-diameter form. Compared with the buckle-type connection structure, it not only improves the reliability of the connection, but also does not limit the flow rate, thereby ensuring the operating efficiency.

[0028] The hose 1 further comprises an inner rubber layer 12, an inner cord layer 13 and an outer cord layer 16, wherein the inner rubber layer 12 is arranged outside the inner lining layer 11, the inner cord layer 13 is arranged outside the inner rubber layer 12, the outer cord layer 16 is arranged between the skeleton layer and the outer rubber layer 17, the skeleton layer comprises a steel wire layer 14 and an inner rubber layer 12, the inner rubber layer 12 and the steel wire layer 14 are alternately arranged in the radial direction, and the middle rubber layer 15 between the steel wire layers 14 plays a bonding role, so that the steel wire layers 14 are bonded into a whole. The steel wire rope can be a steel wire, or a steel wire rope or a steel cord.

[0029] The sleeve 21 is provided with a plurality of anti-pull-out holes along the axial direction, and the wedge-shaped sleeves are provided with a plurality of holes with different diameters. The plurality of wedge-shaped sleeves are sequentially inserted into the inner circles of different steel wire layers 14 and the outer circles of the corresponding steel wire layers 14 are respectively embedded in the plurality of anti-pull-out holes. A multi-layer anti-pull-out structure is arranged according to the number of layers of the steel wire layers 14, thereby enhancing the firmness of the connection between the connector 2 and the hose 1 and preventing it from falling off in an ultra-high pressure environment.

[0030] Take the hose 1 with four layers of steel wire winding as an example. Figure 4 As shown, the anti-pull-out hole includes a first anti-pull-out hole 214 and a second anti-pull-out hole 215. Figure 5 , Figure 6 As shown, the wedge-shaped sleeve includes an outer wedge-shaped sleeve 23 and an inner wedge-shaped sleeve 22. The steel wire layer 14 has four layers. The outer wedge-shaped sleeve 23 embeds the two outer steel wire layers 14 into the first anti-pull-out hole 214, and the inner wedge-shaped sleeve 22 embeds the two inner steel wire layers 14 into the second anti-pull-out hole 215.

[0031] Two anti-pull-out holes are arranged in the sleeve 21, and a wedge-shaped sleeve is arranged under every two layers of steel wire, so that the outer end diameter of the steel wire layer 14 is larger than the inner end diameter. The two sections jointly realize the anti-pull-out function under ultra-high pressure, thereby improving the stability and durability of the overall structure.

[0032] The sleeve 21 is provided with a centering hole 213 , which penetrates the anti-pullout hole of the sleeve 21 . At least three centering holes 213 are provided along the circumference of the sleeve 21 .

[0033] In this embodiment, there is one centering hole 213 in each of the four directions of up, down, left and right, which is used to adjust the concentricity of the sleeve 21 after assembly before injection of glue. By installing four screws and adjusting the screw-in depth of the screws, the hose 1 is in the center of the sleeve 21 after the sleeve 21 is assembled.

[0034] The sleeve 21 is provided with a sealing hole 216, and the joint 2 also includes a sealing sleeve 26 (such as Figure 7 As shown in the figure, the axial inner end of the sealing sleeve 26 is inserted between the inner lining layer 11 and the inner rubber layer 12, and the inner rubber layer 12 is embedded in the sealing hole 216, and the axial outer end of the sealing sleeve 26 abuts against the root end surface of the sealing hole 216. The sealing sleeve 26 is made of 45# steel or other metal materials, and the right end is a tapered tube. After the adhesive is coated on its surface, it is embedded between the inner rubber layer 12 and the inner lining layer 11 to expand the inner rubber layer, play a sealing role, and prevent medium leakage.

[0035] The sleeve 21 is also provided with a glue injection hole 212, which penetrates the wall of the sleeve 21 and is connected with the sealing hole 216 and the anti-pull-out hole. The gaps between the sealing hole 216 and the anti-pull-out hole are filled by injecting heated and molten thermosetting resin, which becomes solid after cooling, fixing the components as a whole, thereby improving the sealing and anti-pull-out functions of the joint 2.

[0036] The root of the hose assembly is a stress concentration area, where the rubber wear is more serious. For ordinary pressure assemblies, the crimping type can meet the use requirements, but for ultra-high pressure series, the crimping type is prone to leakage from the position of the joint 2, especially prone to failure from the tail of the joint 2.

[0037] In this embodiment, the joint 2 further includes a protective net 25, which is a steel wire wound on the inner side of the inner rubber layer 12. The steel wire protective net 25 is installed at the tail of the sleeve 21 to limit excessive bending of the root of the sleeve 21, avoid forming a stress concentration area at the root of the sleeve 21, and thus avoid leakage at this location.

[0038] The axial inner end of the sleeve 21 is provided with an internal threaded hole 211, and the joint 2 further includes a press sleeve 24. Figure 8As shown, the pressing sleeve 24 is sleeved on the outside of the protective net 25, the axial outer end of the pressing sleeve 24 is provided with an external thread 242 that matches the internal thread of the sleeve 21, the axial inner end of the pressing sleeve 24 is provided with a frustum 241, and the outer rubber layer 17 is coated on the outside of the pressing sleeve 24. The pressing sleeve 24 is connected to the steel wire mesh pressing sleeve 24 as a whole, and its function is to fix the protective net 25, and the frustum 241 of the pressing sleeve 24 makes the outer diameter smoothly transition to the steel wire layer 14.

[0039] The inner hole wall at the axial outer end of the sleeve 21 has an inner coating 217. Specifically, the portion of the inner wall of the sleeve 21 that contacts the medium is lined with a layer of ultra-high molecular weight polyethylene film (UPE) by rotational molding. The process is as follows: the inner wall of the sleeve 21 is sandblasted to make the surface clean and rough, thereby increasing the bonding strength of the UPE therewith. Then, it is installed on a special mold, and after adding UPE powder, it is heated by rotation so that it is melted and evenly adhered to the inner wall of the sleeve 21. After cooling, it is machined to machine the inner diameter of the sleeve 21 to the required size. By lining the inner wall of the sleeve 21 with UPE by rotational molding, the UPE has excellent properties such as wear resistance and acid corrosion resistance, which can greatly increase the service life of the joint 2.

[0040] The outer circle of the axial outer end is an outer connecting section 218 , which can be connected to a union or a flange, or can be made into an integrated union or flange, thereby ensuring the versatility and universality of the joint 2 .

[0041] The preparation method of the above hose assembly comprises:

[0042] 1. Spirally wrap the ultra-high molecular weight polyethylene film on a clean steel mandrel.

[0043] 2. Use an extruder or winding film to wrap the inner glue around the outside of the film.

[0044] 3. The inner rubber layer 12 is wound around the inner cord layer 13, and the number of layers is 2-8 according to needs.

[0045] 4. A middle rubber layer 15 and a steel wire layer 14 are wound around the inner cord layer 13. There is a middle rubber layer 15 under each steel wire layer 14. According to the pressure requirement, 2 to 12 layers of steel wire layers 14 are wound.

[0046] 5. Around the last steel wire layer 14, 1 to 3 layers of middle rubber layer 15 are wound.

[0047] 6. Wrap the outer cord layer 16 around the last middle rubber layer 15, and assemble the compression sleeve 24 onto the hose 1 after wrapping. Fig. 9 shown.

[0048] 7. Use a cutting machine to cut the outer two layers of steel wire 14 to the position of section A, and cut the inner two layers of steel wire 14 to the position of section B. Before cutting, tie up the cut parts to prevent them from falling apart. Fig.10 shown.

[0049] 8. After cutting, pass the pressing sleeve 24 from the pipe head to the pipe body for use. Then put the sealing sleeve 26, the outer wedge sleeve 23 and the inner wedge sleeve 22 on the stripped wire section A and section B, as shown in the figure. Fig.11 shown.

[0050] 9. Sleeve the sleeve 21 on the end of the pipe body, and push the sleeve 21 in through the external force of the oil cylinder, so that the sealing sleeve 26, the inner wedge sleeve 22 and the outer wedge sleeve 23 are respectively embedded between the UPE inner lining layer 11 and the inner rubber layer 12, between the inner cord layer 13 and the first steel wire layer 14, and between the second steel wire layer 14 and the third steel wire layer 14. Fig.12 .

[0051] 10. After the sleeve 21 is pushed in, 2-5 layers of steel wire mesh 25 are wound around the tail of the sleeve 21 to prevent excessive bending at this position. After winding, the pressing sleeve 24 is rotated and assembled to the tail end of the sleeve 21 to fix the steel wire mesh. Fig.13 shown.

[0052] 11. Install the self-aligning screw in the self-aligning hole 213, and adjust the screw depth so that the distance between the end of the pipe head inside the sleeve 21 and the inner wall of the sleeve 21 in the four directions of up, down, left and right is equal. After the adjustment is completed, start to inject molten thermosetting resin into the sealing hole 216 and the anti-pull-out hole with high pressure through the injection hole 212 to fill the gap. After cooling, it becomes solid, and the entire joint 2 becomes one. Due to the wedging of the wedge sleeve, the steel wire, the wedge sleeve and the thermosetting resin are all incompressible, the outer end diameter D1 of the second anti-pull-out hole 215 is larger than the inner end diameter D2, and the outer end diameter D3 of the first anti-pull-out hole 214 is larger than the inner end diameter D4. Therefore, the pipe body cannot be pulled out of the sleeve 21 when under pressure, thereby realizing the anti-pull-out function. This connection method is safe, reliable and durable.

[0053] 12. Coat the outer surface of the sleeve 21 and the surface of the compression sleeve 24 with Chemlock adhesive, and then coat the outer surface of the pipe body cord layer and the surface of the joint 2 with an outer rubber layer 17. After coating, wrap the water cloth for vulcanization, and then remove the cloth and core to obtain a finished product. Fig.14 shown.

[0054] Although the above describes the specific implementation methods of the utility model in conjunction with the accompanying drawings, it is not intended to limit the protection scope of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the protection scope of the utility model.

Claims

1. A full-bore acid fracturing hose assembly without buckling, characterized in that: include: Hoses and fittings; The hose comprises an inner lining layer, a skeleton layer and an outer rubber layer in sequence from the inside to the outside; The joint comprises a sleeve and a wedge sleeve, wherein the sleeve is mounted at the end of the hose, the outer rubber layer is coated on the outer side of the sleeve, the inner diameter of the sleeve is equal to the inner diameter of the inner lining layer, an anti-pull-out hole is arranged in the sleeve, and the anti-pull-out hole is a tapered hole, and the diameter of the axial outer end of the tapered hole is greater than the diameter of the axial inner end; The outer side of the wedge-shaped sleeve is conical, and the wedge-shaped sleeve is inserted into the inner ring of the skeleton layer and the outer ring of the skeleton layer is embedded in the anti-pull-out hole.

2. The full-bore acid fracturing hose assembly without buckling as claimed in claim 1, characterized in that: The hose also includes an inner rubber layer, an inner cord layer and an outer cord layer, the inner rubber layer is arranged on the outside of the inner lining layer, the inner cord layer is arranged on the outside of the inner rubber layer, the outer cord layer is arranged between the skeleton layer and the outer rubber layer, the skeleton layer includes a steel wire layer and an inner rubber layer, and the inner rubber layer and the steel wire layer are alternately arranged in the radial direction.

3. The full-bore acid fracturing hose assembly without buckling as claimed in claim 2, characterized in that: The sleeve is provided with a plurality of anti-pull-out holes along the axial direction, and the wedge-shaped sleeves are provided with a plurality of different diameters. The plurality of wedge-shaped sleeves are sequentially inserted into the inner rings of different steel wire layers and the outer rings of the corresponding steel wire layers are respectively embedded in the plurality of anti-pull-out holes.

4. The full-bore acid fracturing hose assembly without buckling as claimed in claim 3, characterized in that: The anti-pull-out hole includes a first anti-pull-out hole and a second anti-pull-out hole, the wedge-shaped sleeve includes an outer wedge-shaped sleeve and an inner wedge-shaped sleeve, the steel wire layer has four layers, the outer wedge-shaped sleeve embeds the two outer steel wire layers into the first anti-pull-out hole, and the inner wedge-shaped sleeve embeds the two inner steel wire layers into the second anti-pull-out hole.

5. The full-bore acid fracturing hose assembly without buckling as claimed in claim 1, characterized in that: The sleeve is provided with a centering hole, which passes through the anti-pull-out hole of the sleeve, and at least three centering holes are provided along the circumference of the sleeve.

6. The full-bore acid fracturing hose assembly without buckling as claimed in claim 2, characterized in that: The sleeve is provided with a sealing hole, and the joint also includes a sealing sleeve, the axial inner end of the sealing sleeve is inserted between the inner lining layer and the inner rubber layer, and the inner rubber layer is embedded in the sealing hole, and the axial outer end of the sealing sleeve abuts against the root end face of the sealing hole.

7. The full-bore acid fracturing hose assembly without buckling as claimed in claim 6, characterized in that: The sleeve is also provided with a glue injection hole, which penetrates through the wall of the sleeve and is connected with the sealing hole and the anti-pull-out hole.

8. The full-bore acid fracturing hose assembly without buckling as claimed in claim 2, characterized in that: The joint also includes a protective net, which is a steel wire wound around the inner side of the inner rubber layer.

9. The full-bore acid fracturing hose assembly without buckling as claimed in claim 8, characterized in that: The axial inner end of the sleeve is provided with an internal threaded hole, and the joint also includes a pressing sleeve, which is sleeved on the outside of the protective net, and the axial outer end of the pressing sleeve is provided with an external thread that matches the internal thread of the sleeve, and the axial inner end of the pressing sleeve is provided with a frustum, and the outer rubber layer is coated on the outside of the pressing sleeve.

10. The full-bore acid fracturing hose assembly without buckling as claimed in claim 1, characterized in that: An inner coating is provided on the inner hole wall of the axial outer end of the sleeve, and the outer circle of the axial outer end is an outer connecting section.

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