An ultra-high pressure, diameter, wear-resistant flexible hose for oil field fracturing

Abstract

The present invention discloses an ultra-high pressure, diameter, wear-resistant flexible hose for oilfield fracturing, and specifically relates to the field of fracturing hoses. The flexible hose includes a hose body and a joint. A plurality of annular protrusions are evenly arranged on the outer circumference of the end of the hose body, and an annular groove is formed between adjacent annular protrusions. A metal ring is inlaid inside each annular protrusion. One end of the joint is a connecting end, and the other end is a mounting end. The inner diameter of the connecting end is smaller than the inner diameter of the mounting end. The present invention arranges a plurality of metal rings on the hose body, and then arranges a plurality of arc pressure columns between adjacent metal rings, and uses a screw to press the arc pressure columns between two adjacent metal rings, and fixes the metal rings in the joint. The inner wall of the hose body will not be deformed, and its inner diameter will not be reduced. The inner diameter of the hose body can always be consistent with the inner diameter of the connecting end. When conveying fluid, the resistance of the fluid passing through changes less, so it is not easy to leak.

Description

Technical Field

[0001] The present invention relates to the technical field of fracturing hoses, and more specifically to an ultra-high pressure, free-diameter, wear-resistant flexible hose for oilfield fracturing. Background Art

[0002] Fracturing is the use of hydraulic force to squeeze high-pressure and viscous liquid into the oil layer. When many cracks are squeezed out of the oil layer, proppant is added to fill the cracks to form cracks in the oil layer to improve the permeability of the oil layer. Fracturing is an important technical measure to increase oil well production.

[0003] Flexible hoses are required for transporting high-pressure liquids and proppants. During production, aluminum alloy joints are installed on both ends of the hoses so that they can be directly connected and installed when in use.

[0004] The installation of hose connectors is different from that of hard pipe connectors. For hard pipes, you can directly insert the hard pipe into the connector and then fix it. However, for hoses, since they are made of flexible materials, you cannot insert the connector during installation. Instead, you need to put the end of the hose outside the connector and then fix it. The purpose is to support the end of the hose and prevent it from being deformed.

[0005] However, when the connector is inserted into the end of the hose for installation, since the connector end has a certain thickness, the cross-sectional area of ​​the fluid passing through is reduced at the docking position. When the flow rate remains unchanged, the flow velocity at this position will increase, and the resistance is proportional to the square of the average flow velocity. Therefore, the resistance when the fluid passes through will increase significantly. When the resistance increases, the fluid needs to consume more power, which increases the operating cost, and leakage is more likely to occur at the connector. Summary of the invention

[0006] The present invention provides an ultra-high pressure, free-diameter, wear-resistant flexible hose for oilfield fracturing, and aims to solve the problem that when a joint is inserted into the end of the hose for installation, the end of the joint has a certain thickness, which will reduce the cross-sectional area of ​​the fluid passing through the docking part, and the resistance of the fluid passing through will increase significantly.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an ultra-high pressure, diameter, wear-resistant flexible hose for oilfield fracturing, comprising a hose body and a joint, a plurality of annular protrusions are uniformly arranged on the outer circumference of the end of the hose body, annular grooves are formed between adjacent annular protrusions, a metal ring is inlaid inside each annular protrusion, one end of the joint is a connecting end, and the other end is a mounting end, the inner diameter of the connecting end is smaller than the inner diameter of the mounting end, the inner diameter of the hose body is equal to the inner diameter of the connecting end, and when the joint is sleeved on the end of the hose body, the end of the hose body is pressed on one side of the connecting end; a plurality of arc pressure columns are arranged in the circumferential direction at the position of each annular groove, a mounting hole is provided at the upper end of the middle part of the arc pressure column, a screw rod is correspondingly arranged for each arc pressure column, and the screw rod has a non-threaded section and a threaded section from bottom to top, the non-threaded section is rotatably connected to the inside of the mounting hole, and the threaded section is threadedly connected to the joint in the radial direction of the joint, and the arc pressure column can be made to approach and squeeze the metal ring or move away from the metal ring by rotating the screw rod.

[0008] In a preferred embodiment, a pressure plate is provided on one side of the connector away from the end of the hose body, a side wall of the pressure plate near the middle is pressed against an adjacent metal ring, and the pressure plate is mounted on the connector by bolts.

[0009] In a preferred embodiment, a guide groove is provided on the side of the arc-shaped pressure column away from the hose body, a fixing pin is fixedly connected to the inner wall of the joint, the lower end of the fixing pin is hinged to a guide rod through a torsion elastic member, and the lower end of the guide rod is located inside the guide groove.

[0010] In a preferred embodiment, the width of the fixing pin is smaller than the width of the guide groove, so that when the arc-shaped pressure column moves in a direction away from the hose body, the fixing pin can be inserted into the interior of the guide groove.

[0011] In a preferred embodiment, three metal rings are provided and two annular grooves are provided, wherein the arc-shaped pressure column in one annular groove is located at a side position between two adjacent arc-shaped pressure columns in another annular groove.

[0012] In a preferred embodiment, the hose body includes an inner layer, a reinforcement layer and an outer layer from the inside to the outside, the inner layer is made of wear-resistant rubber, the reinforcement layer is a steel wire layer, and the outer layer is made of synthetic rubber.

[0013] In a preferred embodiment, the pressure plate includes two half-discs. When the two half-discs are combined, the outer wall of the hose body is clamped by the two half-discs, and a sealing ring is provided between the contact surfaces of the half-discs and the end of the connector.

[0014] In a preferred embodiment, the ultra-high pressure, diameter, wear-resistant flexible hose also includes a sealing assembly, wherein both ends of the two half-disks are provided with inclined grooves, wherein the width of the inclined grooves close to the joint is smaller than the width of the grooves away from the joint, and the sealing assembly includes a sealing block, wherein the outer wall of the sealing block is covered with a sealing gasket, and after the two inclined grooves are merged, the sealing block is disposed in the space formed by the two inclined grooves.

[0015] In a preferred embodiment, an inner cavity is opened on the sealing block, a movable rod is inserted into the inner cavity, an elastic component is sleeved on the outer side of the movable rod, the elastic component is used to reset the movable rod to the side away from the joint, and a steel wire is fixedly connected to the inner wall of the joint, and the steel wire passes through the bottom of one of the arc-shaped pressure columns and is connected to the end of the movable rod.

[0016] In a preferred embodiment, one end of the movable rod close to the joint is provided with a draw hook, and one end of the steel wire close to the sealing assembly is fixedly connected with a draw ring, and the draw hook hooks the draw ring.

[0017] Technical effects and advantages of the present invention:

[0018] The present invention provides a plurality of metal rings on a hose body, arranges a plurality of arc-shaped pressure columns between adjacent metal rings, and uses a screw to press the arc-shaped pressure columns between two adjacent metal rings to fix the metal rings in a joint. The inner wall of the hose body will not be deformed, and its inner diameter will not be reduced. The inner diameter of the hose body can always be consistent with the inner diameter of the connection end. When conveying fluid, the resistance of the fluid passing through changes less, and therefore, leakage is not likely to occur.

[0019] The present invention provides a sealing assembly. When the arc pressure column presses the annular groove downward to fix it, the steel wire can be pressed downward at the same time to make the sealing gasket covered by the outer wall of the sealing block tightly pressed against the inner wall of the inclined groove, so as to seal the radial joint position of the two half-disc bodies. On the one hand, the sealing prevents the internal parts of the installation end from rusting or entering other liquids. On the other hand, it can avoid the inability of bolts to be inserted into the holes when the half-disc bodies are installed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the local structure of the present invention Figure 1 .

[0022] Figure 3 It is a schematic diagram of the local structure of the present invention Figure 2 .

[0023] Figure 4 For the present invention Figure 2 Half section of the front view.

[0024] Figure 5 For the present invention Figure 4 A magnified view of the local structure.

[0025] Figure 6 For the present invention Figure 4 Schematic diagram of the local structure of the cross-sectional view at AA.

[0026] Figure 7 It is a schematic diagram of the installation of the arc pressure column, screw rod, fixing pin and guide rod of the present invention.

[0027] Figure 8 It is a schematic structural diagram of two half-discs of the present invention.

[0028] Fig. 9 For the present invention Figure 8 Exploded diagram.

[0029] Fig.10 It is a cross-sectional view of the hose body of the present invention.

[0030] The accompanying drawings are marked as follows: 1. hose body; 101. inner layer; 102. reinforcement layer; 103. outer layer; 11. annular protrusion; 12. annular groove; 2. metal ring; 3. joint; 31. connecting end; 32. mounting end; 4. pressure plate; 41. half plate; 42. inclined groove; 5. arc pressure column; 51. mounting hole; 52. guide groove; 53. through groove; 6. screw; 61. non-threaded section; 62. threaded section; 7. fixing pin; 71. guide rod; 8. sealing assembly; 81. sealing block; 811. inner cavity; 82. movable rod; 821. pull hook; 822. pressure cap; 83. elastic component; 84. steel wire; 85. pull ring. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Refer to the instruction manual Figure 1-Figure 10A wear-resistant flexible hose with ultra-high pressure and diameter for oilfield fracturing, comprising a hose body 1 and a connector 3, a plurality of annular protrusions 11 are uniformly arranged on the outer circumference of the end of the hose body 1, annular grooves 12 are arranged between adjacent annular protrusions 11, a metal ring 2 is inlaid inside each annular protrusion 11, one end of the connector 3 is a connecting end 31, and the other end is a mounting end 32, the inner diameter of the connecting end 31 is smaller than the inner diameter of the mounting end 32, the inner diameter of the hose body 1 is equal to the inner diameter of the connecting end 31, when the connector 3 is sleeved on the end of the hose body 1, the inner diameter of the hose body 1 is equal to the inner diameter of the connecting end 31, and when the connector 3 is sleeved on the end of the hose body 1, the inner diameter of the hose body 1 is equal to the inner diameter of the connecting end 31. The end is pressed on one side of the connecting end 31; a plurality of arc-shaped pressure columns 5 are arranged in the circumferential direction at the position of each annular groove 12, and a mounting hole 51 is opened at the upper end of the middle part of the arc-shaped pressure column 5, and a screw rod 6 is correspondingly arranged for each arc-shaped pressure column 5, and the screw rod 6 has a non-threaded section 61 and a threaded section 62 from bottom to top, the non-threaded section 61 is rotatably connected to the inside of the mounting hole 51, and the threaded section 62 is threadedly connected to the joint 3 in the radial direction of the joint 3, and by rotating the screw rod 6, the arc-shaped pressure column 5 can be approached and squeezed or away from the metal ring 2.

[0033] When installing the hose body 1 and the connector 3, Figure 4-Figure 5 As shown, the hose body 1 is inserted from one end of the mounting end 32 , and the screw 6 is rotated to drive the arc pressure column 5 to move downward, so that the arc pressure column 5 is pressed against the two metal rings 2 , thereby achieving the purpose of fixing the hose body 1 in the connector 3 .

[0034] Furthermore, if Figure 4-Figure 5 As shown, a pressure plate 4 is provided on one side of the connector 3 away from the end of the hose body 1 , and a side wall of the pressure plate 4 near the middle is pressed against an adjacent metal ring 2 , and the pressure plate 4 is mounted on the connector 3 by bolts.

[0035] It should be noted that when the arc-shaped pressure column 5 is pressed downward with the metal rings 2 on both sides, as the downward pressure increases, the distance between the two metal rings 2 on the far right becomes slightly longer. In order to ensure that the deformation is within a controllable range and avoid the problem of reduced service life of the hose body 1 due to long-term stretching, a pressure plate 4 is provided and installed on the joint 3. After the installation is completed, as shown in FIG. Figure 5 As shown, the rightmost metal ring 2 is squeezed together with the side wall of the pressure plate 4, so that all the metal rings 2 are confined inside the mounting end 32, avoiding excessive stretching of the rightmost metal ring 2.

[0036] Furthermore, if Figure 3 , Figure 6-Figure 7 A guide groove 52 is provided on the side of the arc-shaped pressure column 5 away from the hose body 1, and a fixing pin 7 is fixedly connected to the inner wall of the joint 3. The lower end of the fixing pin 7 is hinged to a guide rod 71 through a torsion elastic member, and the lower end of the guide rod 71 is located inside the guide groove 52.

[0037] It should be noted that when the screw rod 6 is rotated, the arc pressure column 5 may also rotate with the screw rod 6, causing the position of the arc pressure column 5 to shift, so that the two ends of the arc pressure column 5 are pressed on the uppermost ends of the two adjacent metal rings 2, resulting in the problem that it cannot be pressed down into the annular groove 12. Therefore, a fixing pin 7 and a guide rod 71 are provided. The fixing pin 7 is fixed, and the guide rod 71 can be rotated up and down. The torsion elastic member is used to reset the guide rod 71 to the inner side of the guide groove 52. In this way, when the screw rod 6 is rotated again, the guide rod 71 guides the arc pressure column 5, so that the arc pressure column 5 can only move up and down, and will not rotate with the screw rod 6. Among them, the torsion elastic member is a torsion spring.

[0038] In this embodiment, the implementation method is specifically as follows: when installing the hose body 1 on the connector 3, first, rotate the screw 6 so that all the arc-shaped pressure columns 5 are away from the center of the connector 3; then, insert the hose body 1 into the connector 3 from the position of the installation end 32, so that the end of the hose body 1 is pressed against one side of the connection end 31; secondly, install the pressure plate 4 on the connector 3 by bolts, and use the pressure plate 4 to press the rightmost metal ring 2; finally, rotate the screw 6 so that the screw 6 drives the arc-shaped pressure column 5 to move toward the middle of the hose body 1, so that the screw 6 presses on the two adjacent metal rings 2 on both sides, so as to achieve the purpose of locking the metal rings 2 and fixing the metal rings 2 in the connector 3. It should be noted that when rotating the screw 6, since there are several screws 6, they need to be tightened step by step in a diagonal order to prevent the screws 6 from being over-tightened. That is, the installation of the hose body 1 and the connector 3 is completed.

[0039] In the above technical solution, a plurality of metal rings 2 are provided on the hose body 1, and then a plurality of arc-shaped pressure columns 5 are arranged between adjacent metal rings 2, and the arc-shaped pressure columns 5 are pressed between two adjacent metal rings 2 using screws 6, so that the metal rings 2 are fixed in the joint 3. During the entire fixing process, since the metal rings 2 are rigid and the distance between the two metal rings 2 changes very slightly when the metal rings 2 are squeezed by the arc-shaped pressure columns 5, the inner wall of the hose body 1 will not be deformed, and its inner diameter will not decrease. The inner diameter of the hose body 1 can always be consistent with the inner diameter of the connecting end 31. When conveying fluid, the resistance of the fluid passing through changes less, so leakage is not easy to occur.

[0040] Furthermore, if Figure 6 and Figure 7 As shown, the width of the fixing pin 7 is smaller than the width of the guide groove 52 , so that when the arc-shaped pressure column 5 moves in a direction away from the hose body 1 , the fixing pin 7 can be inserted into the inside of the guide groove 52 .

[0041] It should be noted that when the rotating screw 6 drives the arc pressure column 5 to move upward, the lower end of the fixing pin 7 may be inserted into the guide groove 52. Obviously, when the stroke of the arc pressure column 5 remains unchanged, compared with when the fixing pin 7 is not inserted into the guide groove 52, the outer diameter of the joint 3 can be set smaller when the fixing pin 7 is inserted into the guide groove 52, thereby reducing its volume.

[0042] Furthermore, if Figure 2 As shown, three metal rings 2 are provided, and there are two annular grooves 12 , wherein the arc-shaped pressure column 5 in one annular groove 12 is located at a side position between two adjacent arc-shaped pressure columns 5 in another annular groove 12 .

[0043] It should be noted that a group of arc-shaped pressure columns 5 is arranged at the position of each annular groove 12, with four in each group. Three metal rings 2 are arranged, corresponding to two groups of arc-shaped pressure columns 5. While improving the stability of fixation, the number of arc-shaped pressure columns 5 can be minimized.

[0044] Furthermore, if Fig.10 As shown, the hose body 1 includes an inner layer 101, a reinforcement layer 102 and an outer layer 103 from the inside to the outside. The inner layer 101 is made of wear-resistant rubber, the reinforcement layer 102 is a steel wire layer, and the outer layer 103 is made of synthetic rubber.

[0045] It should be noted that the wear-resistant rubber can improve the wear resistance of the hose body 1 , the synthetic rubber can improve the corrosion resistance of the hose body 1 , and the steel wire layer is used to improve the strength of the hose body 1 .

[0046] Refer to the instruction manual Figure 3-Figure 5 , Figure 8-Figure 10 Due to the presence of the annular protrusion 11, if the pressure plate 4 is made into a whole, it is difficult to put it on the hose body 1. Therefore, the pressure plate 4 includes two half-discs 41. When the two half-discs 41 are combined, the outer wall of the hose body 1 is clamped by the two half-discs 41, and a sealing ring is provided between the contact surface between the half-disc 41 and the end of the connector 3.

[0047] A sealing ring can be set at the part where the two half-disks 41 contact the joint 3, and the part that contacts the side of the annular protrusion 11 can play a sealing role through the material of the annular protrusion 11 itself. However, if a sealing ring is set at the radial joint position of the two half-disks 41 (the joint position here does not include the upper and lower ends of the joint, because the upper and lower ends are respectively sealed by the sealing ring in contact with the half-disk 41 and the material of the annular protrusion 11 itself), when the half-disk 41 is installed on the joint 3 by bolts, it is difficult to insert the bolts into the holes because the sealing ring has a certain thickness. Based on this, the ultra-high pressure diameter wear-resistant flexible hose also includes a sealing component 8, and both ends of the two half-disks 41 are provided with an inclined groove 42, and the width of the inclined groove 42 close to the joint 3 is smaller than the width of the side away from the joint 3. The sealing component 8 includes a sealing block 81, and the outer wall of the sealing block 81 is covered with a sealing gasket. After the two inclined grooves 42 are merged, the sealing block 81 is arranged in the space formed by the two inclined grooves 42.

[0048] Furthermore, an inner cavity 811 is opened on the sealing block 81, and a movable rod 82 is inserted into the inner cavity 811. An elastic component 83 is sleeved on the outer side of the movable rod 82. The elastic component 83 is used to reset the movable rod 82 to the side away from the joint 3. A steel wire 84 is fixedly connected to the inner wall of the joint 3. The steel wire 84 passes through the bottom of one of the arc-shaped pressure columns 5 and is connected to the end of the movable rod 82.

[0049] Furthermore, one end of the movable rod 82 close to the joint 3 has a pull hook 821 , and one end of the steel wire 84 close to the sealing assembly 8 is fixedly connected with a pull ring 85 , and the pull hook 821 hooks the pull ring 85 .

[0050] It should be noted that a pressure cap 822 is provided at the end of the movable rod 82 away from the joint 3 for pressing the movable rod 82, and a through groove 53 is provided at the bottom of the arc-shaped pressure column 5 for allowing the steel wire 84 to pass through, wherein the elastic component 83 is a compression spring.

[0051] In this embodiment, the implementation is as follows: when installing the two half-disc bodies 41, first press the pressure cap 822 to make the movable rod 82 compress the elastic component 83, and the hook 821 extends forward, then put the pull ring 85 on the hook 821, and release the pressure cap 822. At this time, under the action of the elastic component 83, the end of the hook 821 presses on the side wall of the sealing block 81, thereby preventing the pull ring 85 from falling. Then, after the two half-disc bodies 41 are installed on the joint 3 by bolts, the sealing block 81 is placed in the space formed by the two inclined grooves 42. The last step is to fix the hose body 1, that is, by twisting the screw 6 to press the arc pressure column 5 on the two adjacent metal rings 2. At this time, the arc pressure column 5 will press the steel wire 84 downward, so that the steel wire 84 pulls the movable rod 82 through the pull ring 85, and the movable rod 82 pulls the sealing block 81 toward the direction of the joint 3 through the elastic component 83, so that the sealing gasket covered by the outer wall of the sealing block 81 is tightly pressed against the inner wall of the inclined groove 42, thereby sealing the radial joint position of the two half-disc bodies 41.

[0052] In the above technical solution, by setting the sealing assembly 8, when the arc pressure column 5 presses the annular groove 12 downward to fix it, the steel wire 84 can be pressed down at the same time to make the sealing gasket covered by the outer wall of the sealing block 81 tightly pressed against the inner wall of the inclined groove 42, so as to seal the radial joint position of the two half-disc bodies 41. On the one hand, the sealing prevents the internal parts of the installation end 32 from rusting or entering other liquids, and on the other hand, it can avoid the inability of the bolts to be inserted into the holes when the half-disc body 41 is installed.

[0053] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An ultra-high pressure, diameter, wear-resistant flexible hose for oilfield fracturing, characterized in that: The invention comprises a hose body (1) and a connector (3), wherein a plurality of annular protrusions (11) are evenly arranged in sequence on the outer circumference of the end of the hose body (1), annular grooves (12) are provided between adjacent annular protrusions (11), a metal ring (2) is inlaid inside each annular protrusion (11), one end of the connector (3) is a connecting end (31), and the other end is a mounting end (32), the inner diameter of the connecting end (31) is smaller than the inner diameter of the mounting end (32), the inner diameter of the hose body (1) is equal to the inner diameter of the connecting end (31), and when the connector (3) is sleeved on the end of the hose body (1), the end of the hose body (1) is pressed against one side of the connecting end (31); A plurality of arc-shaped pressure columns (5) are arranged in the circumferential direction at the position of each annular groove (12); a mounting hole (51) is opened at the upper end of the middle part of the arc-shaped pressure column (5); a screw rod (6) is arranged corresponding to each arc-shaped pressure column (5); the screw rod (6) has a non-threaded section (61) and a threaded section (62) from bottom to top; the non-threaded section (61) is rotatably connected to the inside of the mounting hole (51); the threaded section (62) is threadedly connected to the joint (3) in the radial direction of the joint (3); and by rotating the screw rod (6), the arc-shaped pressure column (5) can be moved close to and squeeze the metal ring (2) or away from the metal ring (2); A pressure plate (4) is provided on one side of the joint (3) away from the end of the hose body (1); a side wall of the pressure plate (4) near the middle is pressed against an adjacent metal ring (2); the pressure plate (4) is mounted on the joint (3) by bolts; the pressure plate (4) comprises two half-plate bodies (41); The ultra-high-pressure, normal-diameter, wear-resistant flexible hose further comprises a sealing assembly (8), wherein both ends of the two half-discs (41) are provided with an inclined groove (42), wherein the width of the inclined groove (42) close to the joint (3) is smaller than the width of the side away from the joint (3), wherein the sealing assembly (8) comprises a sealing block (81), wherein the outer wall of the sealing block (81) is coated with a sealing gasket, and when the two inclined grooves (42) are combined, the sealing block (81) is arranged in a space formed by the two inclined grooves (42); The sealing block (81) is provided with an inner cavity (811), a movable rod (82) is inserted into the inner cavity (811), an elastic component (83) is sleeved on the outer side of the movable rod (82), the elastic component (83) is used to reset the movable rod (82) to a side away from the joint (3), and a steel wire (84) is fixedly connected to the inner wall of the joint (3), and the steel wire (84) is connected to the end of the movable rod (82) after passing through the bottom of one of the arc-shaped pressure columns (5).

2. The ultra-high pressure, free-diameter, wear-resistant flexible hose for oilfield fracturing according to claim 1, characterized in that: A guide groove (52) is provided on a side of the arc-shaped pressure column (5) away from the hose body (1); a fixing pin (7) is fixedly connected to the inner side wall of the joint (3); a guide rod (71) is hingedly connected to the lower end of the fixing pin (7) via a torsion elastic member; and the lower end of the guide rod (71) is located inside the guide groove (52).

3. The ultra-high pressure, free-diameter, wear-resistant flexible hose for oilfield fracturing according to claim 2, characterized in that: The width of the fixing pin (7) is smaller than the width of the guide groove (52), so that when the arc-shaped pressure column (5) moves in a direction away from the hose body (1), the fixing pin (7) can be inserted into the interior of the guide groove (52).

4. The ultra-high pressure, free-diameter, wear-resistant flexible hose for oilfield fracturing according to claim 1, characterized in that: Three metal rings (2) are provided, and two annular grooves (12) are provided, wherein the arc-shaped pressure column (5) in one annular groove (12) is located at a side position between two adjacent arc-shaped pressure columns (5) in another annular groove (12).

5. The ultra-high pressure, free-diameter, wear-resistant flexible hose for oilfield fracturing according to claim 1, characterized in that: The hose body (1) comprises, from the inside to the outside, an inner layer (101), a reinforcement layer (102) and an outer layer (103), the inner layer (101) being made of wear-resistant rubber, the reinforcement layer (102) being a steel wire layer, and the outer layer (103) being made of synthetic rubber.

6. The ultra-high pressure, free-diameter, wear-resistant flexible hose for oilfield fracturing according to claim 1, characterized in that: When the two half-discs (41) are combined, the outer wall of the hose body (1) is clamped by the two half-discs (41), and a sealing ring is provided between the contact surfaces of the half-discs (41) and the end of the connector (3).

7. The ultra-high pressure, free-diameter, wear-resistant flexible hose for oilfield fracturing according to claim 1, characterized in that: One end of the movable rod (82) close to the joint (3) is provided with a draw hook (821), and one end of the steel wire (84) close to the sealing assembly (8) is fixedly connected with a draw ring (85), and the draw hook (821) hooks the draw ring (85).

Images