High-pressure flexible hose for acid fracturing operation

Abstract

A high-pressure flexible hose for acid fracturing operation relates to the technical field of high-pressure pipelines and comprises a rubber hose and metal joints fixed at two ends of the rubber hose, and the rubber hose comprises an inner rubber layer, a steel wire winding layer and an outer rubber layer which are sequentially sleeved from inside to outside; the metal joint comprises an inner core body and a first sleeve, the end part of the inner core body penetrates into an inner hole in the end part of the rubber tube, and the first sleeve is buckled and connected to the outer side of the end part of the rubber tube; the metal joint comprises a sealing section and a locking section, and a plurality of sealing bulges surrounding the inner core body are arranged on the sealing section and the outer surface of the inner core body; in the sealing section, an annular groove surrounding the inner core body is further formed in the outer surface of the inner core body, and a sealing piece is arranged in the annular groove; the inner surface of the first sleeve is provided with a pressing protrusion corresponding to the annular groove, the annular groove is located within the range of the pressing protrusion in the length direction of the metal connector, and the probability of leakage is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of high-pressure pipelines, in particular to a high-pressure flexible hose used for acid fracturing operations. Background Art

[0002] In the production process of oil and gas wells in the petroleum industry, there are fracturing operations according to the status of the oil and gas wells, and batches of fracturing sand and gravel are transported to designated locations. At the same time, the hose also needs to transport hydrochloric acid for acidifying the underground formation. Usually, steel pipes are used as transportation channels to withstand the driving high pressure and high-speed movement of sand and gravel during transportation. The above-mentioned transportation pipeline composed of steel pipes and metal pipe joints has the disadvantages of being limited by rigid materials. One is that the layout of the fracturing equipment is limited by the specifications of the steel pipes, which is heavy and inflexible, and is very troublesome to carry, install, and disassemble.

[0003] To solve the above problems, existing technologies gradually use high-pressure flexible hoses to replace steel pipes for fracturing operations. High-pressure flexible hoses can be used for acid fracturing, sand fracturing, and hydraulic fracturing pipelines in well completion operations to transport water-based, oil-based, foam-based, acid-based, and other fracturing fluids under high pressure, and the delivery pressure can currently reach 20,000 psi.

[0004] The crimping type high-pressure flexible hose includes a hose and metal joints fixed at both ends of the hose. The sealing performance of the hose and the joint is crucial to the quality of the high-pressure flexible hose. Some existing technologies use a single barb-shaped structure to achieve the sealing of the hose and the joint, and the connection between the hose and the joint is prone to leakage. Utility Model Content

[0005] The utility model aims at solving the above-mentioned technical problems existing in the prior art and provides a high-pressure flexible hose for acid fracturing operation, thereby reducing the probability of leakage.

[0006] To achieve the above technical objectives, the embodiment of the utility model provides a high-pressure flexible hose for acid fracturing operations, including a hose and metal joints fixed at both ends of the hose.

[0007] The rubber hose includes an inner rubber layer, a steel wire winding layer and an outer rubber layer which are sequentially sleeved from the inside to the outside; the metal joint includes an inner core body and a first sleeve, the end of the inner core body is inserted into the inner hole of the end of the rubber hose, and the first sleeve is buckled and connected to the outer side of the end of the rubber hose;

[0008] The metal joint includes a sealing section and a locking section. In the sealing section, the outer surface of the inner core is provided with a plurality of sealing protrusions surrounding the inner core; in the sealing section, the outer surface of the inner core is also provided with an annular groove surrounding the inner core, and a sealing member is provided in the annular groove; the inner surface of the first sleeve is provided with a clamping protrusion corresponding to the annular groove, and the annular groove is located within the range of the clamping protrusion in the length direction of the metal joint.

[0009] In some embodiments, there are multiple annular grooves, and at least one sealing protrusion is spaced between two adjacent annular grooves.

[0010] In some embodiments, a retaining ring is further provided in the annular groove, and the retaining ring is located on a side of the sealing component away from the hose.

[0011] In some embodiments, two retaining rings are disposed in the annular groove, and the sealing member is located between the two retaining rings.

[0012] In some embodiments, a concave arc-shaped groove is provided on a side of the retaining ring facing the sealing member.

[0013] In some embodiments, the pressing protrusion has a cylindrical inner contour.

[0014] In some embodiments, the metal joint further includes a second sleeve, and the second sleeve is buckled on the outer side of the first sleeve.

[0015] In some embodiments, the sealing protrusion is barb-shaped, rectangular-shaped, or trapezoidal-shaped.

[0016] One or more technical solutions provided in the embodiments of the utility model have at least the following technical effects or advantages: by providing an annular groove and a clamping protrusion corresponding to the annular groove, support can be provided for the sealing ring of the annular groove, thereby improving the pressure bearing capacity of the connection between the hose and the joint and reducing the chance of leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The figure is a schematic structural diagram of a high-pressure flexible hose according to an embodiment of the utility model.

[0018] Figure 2 This is an enlarged view of the end of a high-pressure flexible hose according to an embodiment of the utility model.

[0019] Figure 3 The present invention is a schematic structural diagram of a metal joint in a high-pressure flexible hose according to an embodiment of the present invention.

[0020] Figure 4 for Figure 2 A is a partial enlarged view of the figure.

[0021] Figure 5 The present invention is a layout diagram of a sealing assembly in an annular groove of a high-pressure flexible hose according to an embodiment of the present invention.

[0022] Figure 6 The present invention is a layout diagram of a sealing assembly in an annular groove of a high-pressure flexible hose according to an embodiment of the present invention.

[0023] Description of Reference Numerals

[0024] 10-joint, 11-inner core, 111-annular groove, 112-sealing protrusion, 113-first locking protrusion, 114-snap-on ring groove, 12-first sleeve, 121-pressing protrusion, 122-second locking protrusion, 123-snap-on portion, 13-second sleeve, 14-sealing member, 15-retaining ring, 151-arc groove;

[0025] 20-rubber hose, 21-inner rubber layer, 22-wire winding layer, 23-outer rubber layer;

[0026] S1-sealing section, S2-locking section. DETAILED DESCRIPTION

[0027] Other objects and advantages of the present invention will become apparent through explanation of the following preferred embodiments of the present application.

[0028] like Figure 1 and Figure 2 As shown, a high-pressure flexible hose for acid fracturing operation includes a hose 20 and metal joints 10 fixed at both ends of the hose 20. The end of the metal joint 10 away from the hose 20 can be, for example, a flange, a union or other connection forms, which are not limited.

[0029] The rubber hose 20 includes an inner rubber layer 21, a steel wire winding layer 22 and an outer rubber layer 23 which are sequentially sleeved from the inside to the outside. Usually, the steel wire winding layer 22 is formed by winding a plurality of layers of steel wires.

[0030] The metal joint 10 includes an inner core 11 and a first sleeve 12. The end of the inner core 11 is inserted into the inner hole of the end of the hose 20, and the first sleeve 12 is crimped and connected to the outer side of the end of the hose 20. The first sleeve 12 and the wire winding layer 22 are squeezed and deformed by a high-pressure hydraulic crimping machine and a mold to achieve the connection between the metal joint 10 and the hose 20.

[0031] like Figure 3As shown, the metal joint 10 includes a sealing section S1 and a locking section S2. In the sealing section S1, the outer surface of the inner core 11 is provided with a plurality of sealing protrusions 112 surrounding the inner core 11; in the sealing section S1, the outer surface of the inner core 11 is also provided with an annular groove 111 surrounding the inner core 11, and a sealing member 14 is provided in the annular groove 111, and the sealing member 14 can be, for example, an O-type rubber sealing ring or a rectangular rubber sealing ring; the inner surface of the first sleeve 12 is provided with a clamping protrusion 121 corresponding to the annular groove 111, and the annular groove 111 is located within the range of the clamping protrusion 121 in the length direction of the metal joint 10. During the buckling process, the first sleeve 12 squeezes the steel wire winding layer 22 to deform it, and the steel wire winding layer 22 further squeezes the inner rubber layer 21 and compresses the inner rubber layer 21. By providing the clamping protrusion 121, support can be provided for the sealing member 14 in the annular groove 111.

[0032] In addition, during the crimping process, the first sleeve 12 is squeezed and elongated in the length direction of the metal joint 10, making it difficult to align the clamping protrusion 121 and the annular groove 111. In the present application, the dimension L2 of the clamping protrusion 121 in the length direction of the metal joint 10 is larger than the dimension L1 of the annular groove 111 in the length direction of the metal joint 10, thereby ensuring that after the crimping is completed, the clamping protrusion 121 and the annular groove 111 correspond in position.

[0033] It should be emphasized that, in the present application, setting the seal 14 between the inner core 11 and the inner rubber layer 21 made of metal material is different from setting the seal 14 between metal and metal, because the inner rubber layer 21 has a certain deformation ability and cannot provide sufficient support for the seal 14. In the present application, by setting a compression protrusion 121 corresponding to the annular groove 111 on the inner surface of the first sleeve 12, the steel wire winding layer 22 is squeezed on the outer side of the rubber hose 20, and then the inner rubber layer 21 is squeezed by the steel wire winding layer 22, and sufficient support is provided for the seal 14 by compressing the inner rubber layer 21, thereby improving the sealing ability of the connection.

[0034] In some embodiments, Figure 3 As shown, a buckle portion 123 extending radially inward is provided at the end of the first sleeve 12 away from the rubber hose 20, and correspondingly, a buckle ring groove 114 is provided on the inner core 11. Before buckling, the inner hole diameter of the buckle portion 123 is larger than the notch diameter of the buckle ring groove 114, so that the buckle ring groove 114 and the buckle portion 123 can be installed in corresponding positions; after buckling, the buckle portion 123 is inserted into the buckle ring groove 114, providing a connection between the first sleeve 12 and the inner core 11, avoiding the buckle ring groove 114.

[0035] like Figure 3As shown, in the locking section S2 of the metal joint 10, the inner core 11 is provided with a plurality of first locking protrusions 113 protruding radially outward; the inner surface of the first sleeve 12 is provided with a plurality of second locking protrusions 122 protruding radially inward, and the first locking protrusions 113 and the second locking protrusions 122 are arranged alternately in the length direction of the metal joint 10. Figure 2 After the buckling is completed, the steel wire winding layer 22 is squeezed and deformed into a curved shape.

[0036] In some embodiments, Figure 4 As shown, there are multiple annular grooves 111, and at least one sealing protrusion 112 is spaced between two adjacent annular grooves 111. By providing multiple annular grooves 111, the sealing ability of the sealing section S1 is further improved.

[0037] In some embodiments, Figure 4 As shown, a retaining ring 15 is further provided in the annular groove 111, and the retaining ring 15 is located on the side of the seal 14 away from the hose 20. The retaining ring 15 can provide the seal 14 with a supporting force in the length direction of the metal joint 10, thereby improving the sealing ability and service life of the seal 14.

[0038] In some embodiments, Figure 5 As shown, two retaining rings 15 are arranged in the annular groove 111, and the sealing member 14 is located between the two retaining rings 15. The retaining rings 15 provide support force for the sealing member 14 on both sides of the metal joint 10 in the length direction.

[0039] In some embodiments, Figure 6 As shown, the retaining ring 15 is provided with an inwardly concave arc groove 151 on one side facing the sealing member 14. The arc groove 151 can clamp the sealing member 14 in the front and rear directions and the radial direction, so as to prevent the sealing member 14 from coming out of the annular groove 111 under the friction force of the surface of the inner rubber layer 21 when the inner core 11 is inserted into the inner hole of the end of the hose 20.

[0040] In some embodiments, the pressing protrusion 121 has a cylindrical inner contour, which provides a uniform pressing force for the inner rubber layer 21 .

[0041] In some embodiments, the metal joint 10 further includes a second sleeve 13, which is buckled on the outside of the first sleeve 12. The second sleeve 13 provides support for the first sleeve 12, thereby improving the pressure bearing capacity of the connection between the metal joint 10 and the hose 20.

[0042] In some embodiments, the sealing protrusion 112 is in a barb-like, rectangular or trapezoidal shape. There are many options for the sealing protrusion 112 and there is no particular limitation on this.

[0043] The device of the present application is described in detail with reference to the preferred technical solution of the present application. However, it should be noted that, without departing from the spirit of the present application, those skilled in the art may make any transformation, modification and change based on the above disclosure. The present application includes the above specific embodiments and any equivalent forms thereof.

Claims

1. A high-pressure flexible hose for acid fracturing operations, characterized in that: It includes a hose and metal joints fixed at both ends of the hose. The rubber hose includes an inner rubber layer, a steel wire winding layer and an outer rubber layer which are sequentially sleeved from the inside to the outside; the metal joint includes an inner core body and a first sleeve, the end of the inner core body is inserted into the inner hole of the end of the rubber hose, and the first sleeve is buckled and connected to the outer side of the end of the rubber hose; The metal joint includes a sealing section and a locking section. In the sealing section, the outer surface of the inner core is provided with a plurality of sealing protrusions surrounding the inner core; in the sealing section, the outer surface of the inner core is also provided with an annular groove surrounding the inner core, and a sealing member is provided in the annular groove; the inner surface of the first sleeve is provided with a clamping protrusion corresponding to the annular groove, and the annular groove is located within the range of the clamping protrusion in the length direction of the metal joint.

2. A high-pressure flexible hose for acid fracturing operations according to claim 1, characterized in that: There are a plurality of annular grooves, and at least one sealing protrusion is spaced between two adjacent annular grooves.

3. A high-pressure flexible hose for acid fracturing operation according to claim 1, characterized in that: A retaining ring is also arranged in the annular groove, and the retaining ring is located at a side of the sealing component away from the rubber hose.

4. A high-pressure flexible hose for acid fracturing operations as claimed in claim 3, characterized in that: Two retaining rings are arranged in the annular groove, and the sealing member is located between the two retaining rings.

5. A high-pressure flexible hose for acid fracturing operations as claimed in claim 4, characterized in that: The retaining ring is provided with an inwardly concave arc groove on one side facing the sealing member.

6. A high-pressure flexible hose for acid fracturing operations according to any one of claims 1 to 5, characterized in that: The pressing projection has a cylindrical inner contour.

7. A high-pressure flexible hose for acid fracturing operations according to any one of claims 1 to 5, characterized in that: The metal joint also includes a second sleeve, which is buckled and pressed on the outer side of the first sleeve.

8. A high-pressure flexible hose for acid fracturing operations according to any one of claims 1 to 5, characterized in that: The sealing protrusion is in a barb shape, a rectangular shape or a trapezoidal shape.

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