Corrugated pipe structure for petroleum downhole tool

Abstract

The utility model relates to the field of corrugated pipes for petroleum downhole tools, in particular to a corrugated pipe structure for petroleum downhole tools, which comprises a sealing ring with grooves on two sides, a fastening frame for enhancing sealing effect and the like. Compared with the prior art, the sealing device has the advantages that a conventional corrugated pipe serves as a main body, the ends where pipe bodies are mutually connected and the connecting mode of the pipe bodies are improved, firstly, the sealing block is designed to be in a ring shape with grooves in the two sides, and the sealing block and the pipe body end attaching faces are improved to be of a complex structure shaped like a Chinese character'gong '; and then, a part with force cooperation is adopted, and the two pipe bodies are excessively extruded towards the sealing ring through rotation of the screw rod, so that gaps between the pipe bodies and the sealing ring are reduced and eliminated, and the sealing effect of the joint of the corrugated pipe is guaranteed to a greater extent.

Description

Technical Field

[0001] The utility model relates to the field of bellows for petroleum downhole tools, in particular to a bellows structure for petroleum downhole tools. Background Art

[0002] A bellows is a tubular elastic sensitive element made of foldable corrugated sheets connected along the folding and expansion direction. Structurally, it is a hose-like component and is often used in underground oil well detection.

[0003] Like most other hoses, bellows are produced in sections. Especially when used in oil wells, sections of bellows need to be spliced ​​together. In scenarios where liquids and gases are easy to invade or overflow, the bellows joints need to be sealed to avoid the impact of seepage and gas leakage on operations. When the hose diameter is less than 500 mm, threaded connection is generally used for sealing connection. When the diameter is greater than 22 mm, flange connection can be used. When flange connection is used for oil well bellows, oil leakage still exists at the cross-section gap. Moreover, during exploration, the bellows need to be quickly disassembled and assembled. Therefore, a bellows structure for oil well tools is needed. Utility Model Content

[0004] 1. Technical Problems Solved

[0005] The technical problem to be solved by the utility model is that when a bellows device is used in an oil well, since multiple pipe bodies are often spliced ​​together, the poor sealing effect at the splicing joints may lead to oil leakage, thereby affecting the normal oil engineering function.

[0006] 2. Technical Solution

[0007] In order to solve the above technical problems, the technical solution provided by the present invention is: a bellows structure for oil downhole tools, comprising a tube body, wherein the end of the tube body is connected to an end cap.

[0008] A sealing ring is provided between the tube bodies, and grooves matching the end heads are provided on both sides of the sealing ring.

[0009] A fastening mechanism is connected to the outside of the tube body, and the fastening mechanism includes a screw, a hexagonal protrusion is connected at the center of the screw, and the external thread structures on both sides of the screw are symmetrically arranged with the hexagonal protrusion as the center, and cooperation rings are connected at both ends of the screw. The screw is rotatably connected on one side of the cooperation ring, and the cooperation ring is connected on the outside of the end head. A locking mechanism is connected between the end head and the cooperation ring, and a plurality of sliding rods that cooperate with the screw are connected between the cooperation rings. A plurality of support parts that respectively cooperate with the screw and the sliding rod are connected to the outside of the cooperation ring.

[0010] Furthermore, the locking mechanism includes a pad, a mounting groove with a screw hole at the bottom is provided on the outer side of the end, a mounting hole is provided on the cooperation ring, the pad is arranged in the mounting groove and the mounting hole, and a fixing bolt is provided between the end and the pad for fixing the fastening mechanism and the components contained therein to the end of the tube body.

[0011] Furthermore, the end head is embedded in the groove and engaged with the sealing ring, which is beneficial to the sealing between the connection points of the two bellows.

[0012] Furthermore, both ends of the screw rod and the sliding rod are connected with limit plates, which provide a maximum displacement limit for the cooperation plate when it moves at both ends of the screw rod.

[0013] Furthermore, the inner diameters of the mounting groove and the mounting hole are set to be consistent with each other, and the pad is respectively engaged with the end head and the cooperation ring by being embedded in the mounting groove and the mounting hole.

[0014] 3. Beneficial Effects

[0015] The advantages of the present invention over the prior art are that: the device takes a conventional bellows as the main body, and makes improvements in the ends of the tubes connected to each other and in the connection method. First, the sealing block is designed to be annular with grooves on both sides, and the fitting surface with the end of the tube body is improved into a complex "bow"-shaped structure. Then, a part with a cooperative force is used to rotate the screw to achieve excessive extrusion of the two tubes toward the sealing ring, so as to reduce and eliminate the gap between the tube body and the sealing ring, thereby providing a greater degree of protection for the sealing effect of the bellows connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the appearance of a bellows structure for oil well tools in this utility model. Figure 1 .

[0017] Figure 2 This is a schematic diagram of the appearance of a bellows structure for oil well tools in this utility model. Figure 2 .

[0018] Figure 3 The utility model is a schematic diagram of the internal structure of a bellows structure for a petroleum downhole tool.

[0019] Figure 4 yes Figure 2 Schematic diagram of the structure of part A.

[0020] Figure 5 yes Figure 3 Schematic diagram of the structure of part B.

[0021] As shown in the figure: 1. Tube body, 2. End, 3. Sealing ring, 4. Groove, 5. Cooperation ring, 6. Support part, 7. Screw, 8. Hexagonal protrusion, 9. Limiting piece, 10. Slide rod, 11. Mounting hole, 12. Mounting groove, 13. Spacer, 14. Fixing bolt. DETAILED DESCRIPTION

[0022] The present invention will be described in further detail below with reference to the accompanying drawings.

[0023] Example 1

[0024] Combined with attachment Figure 1-5 In order to solve the above technical problems, the technical solution provided by the present invention is as follows: a bellows structure for petroleum downhole tools, comprising a pipe body 1, wherein the end of the pipe body 1 is connected with an end head 2, a sealing ring 3 is connected between the pipe bodies 1, and the two sides of the sealing ring 3 are connected with grooves 4 that match the end head 2. The end head 2 is embedded in the groove 4 and engages with the sealing ring 3 to facilitate the sealing between the two bellows. A fastening mechanism is connected to the outside of the pipe body 1, and a locking mechanism is connected between the pipe body 1 and the fastening mechanism. The locking mechanism The fixing mechanism includes a pad 13, and a mounting groove 12 with a screw hole at the bottom is provided on the outer side of the end 2, and a mounting hole 11 is provided on the cooperation ring 5. The pad 13 is located in the mounting groove 12 and the mounting hole 11. The inner diameters of the mounting groove 12 and the mounting hole 11 are consistent with each other. The pad 13 is respectively engaged with the end 2 and the cooperation ring 5 by being embedded in the mounting groove 12 and the mounting hole 11. A fixing bolt 14 is commonly connected between the end 2 and the pad 13 for fixing the fastening mechanism and the components contained therein to the end 2 of the pipe body 1.

[0025] The basic way to connect two hoses is to fix the connection between the two pipe bodies 1 ends 2 through sealing pads and sealing blocks. The device improves the outline design of the sealing block. First, its thickness is increased, and grooves 4 are provided on both sides. The width of the groove 4 is close to the wall thickness of the bellows end 2. Specifically, the former is slightly smaller than the latter, so that when the end 2 is embedded in the groove 4, the pipe body 1 and the sealing ring 3 are interference fit. From the transverse cross-section, the two sides of the sealing ring 3 are generally in a "bow" shape. When connecting two bellows, the sealing effect of the connection can be better. Such a simple snap-fit ​​connection is not stable in actual operation, so a fastening mechanism will be provided here to assist in fixation and increase the sealing effect. The specific design of the fastening mechanism is shown below. The fastening mechanism and The two bellows and the sealing ring 3 are relatively independent components. In order to install and fix the fastening mechanism on the bellows body, the cooperation ring 5 of the fastening mechanism is locked on the end 2 of the tube body 1 by the fixing bolt 14. A relatively large pad 13 is added to this simple fixing method. It is embedded in the mounting groove 12 on the end 2 and also passes through the mounting hole 11 on the cooperation ring 5. It is tightly connected with it through its own material properties, which enhances the lateral fixation of the transverse tube body 1 on the fastening mechanism and is an auxiliary measure. The sealing ring 3 and the pad 13 are both made of materials with good elasticity, dense internal material structure, and not easily damaged or destroyed, such as fluorinated rubber. The center position of the pad 13 has a structure that is convenient for cooperating with the fixing bolt 14 for fixation.

[0026] Example 2

[0027] Combined with attachment Figure 1-3 The fastening mechanism includes a screw 7, a hexagonal protrusion 8 is connected at the center of the screw 7, and the external thread structures on both sides of the screw 7 are symmetrically arranged with the hexagonal protrusion 8 as the center. A cooperation ring 5 is connected at both ends of the screw 7, and the screw 7 is rotatably connected on one side of the cooperation ring 5. The cooperation ring 5 is connected on the outside of the end head 2, and a locking mechanism is connected between the end head 2 and the cooperation ring 5. A plurality of slide rods 10 that cooperate with the screw 7 are connected between the cooperation rings 5, and a plurality of support parts 6 that cooperate with the screw 7 and the slide rod 10 respectively are connected to the outside of the cooperation ring 5. Limiting plates 9 are connected at both ends of the screw 7 and the slide rod 10 to provide a maximum displacement limit for the cooperation plate when it moves at both ends of the screw 7.

[0028] By rotating the screw rods 7 with opposite threads at both ends, the two cooperation rings 5 ​​are driven and tend to move away from or close to each other. At least two support parts 6 are provided on the cooperation ring 5, one of which is used to support the screw rod 7. There is a screw hole on the support part 6, which cooperates with the screw rod 7 to realize that the cooperation ring 5 moves along the axial direction of the screw rod 7 when the screw rod 7 rotates. The remaining support parts 6 are used to support and fix the slide rod 10. There is no limit on the number of designs, and it can be reasonable. The cooperation ring 5 is an annular plate, and its inner diameter is consistent with the outer diameter of the end head 2 of the tube body 1. When in use, the ends 2 of the two bellows extend into the cooperation ring 5 from both ends of the fastening mechanism, and the fastening mechanism is sleeved between the two bellows. And they are fixed to each other through the locking mechanism described above. When the screw 7 rotates, the two cooperation rings 5 ​​will bring the two tube bodies 1 closer to each other and squeeze the sealing ring 3 between them as much as possible, so that the gap between the tube body 1 and the sealing ring 3 becomes smaller or disappears, which can greatly enhance the density effect of the device when connecting two bellows. The screw 7 structure in the fastening mechanism has a fixing effect when it is stationary, so there is almost no loosening of the connection due to expansion of the sealing ring 3 or other circumstances. The total length of the fastening mechanism does not exceed the size of the bellows connection in the theoretical design, so there is no need to worry about the setting of the mechanism affecting the use of the bellows in terms of soft bending.

[0029] When the utility model is implemented, when using the bellows with the structural design of the present application to connect the two parts of the pipe body 1, the sealing ring 3 is first installed on the end face of the end head 2 of the pipe body 1, and then it is inserted from one end of the fastening mechanism, so that the fastening mechanism is sleeved on the end head 2 of the pipe body 1, and then the locking point is accurately found, so that the mounting groove 12 on the end head 2 and the mounting hole 11 on the cooperation ring 5 are aligned, and the pad 13 is first placed inward and pressed slightly to fit it with the pipe body 1 and the cooperation ring 5, and then the fixing bolt 14 is used to pass through the screw hole on the pad 13 and extend into the screw hole at the bottom of the mounting groove 12 to achieve the installation of this part, and then the other part of the pipe body 1 end head 2 is inserted from the other end of the fastening mechanism, and the end head 2 is respectively embedded in the sealing ring 3. 4, and align the mounting groove 12 with the mounting hole 11, and then install and fix it with the pad 13 and the fixing bolt 14. At this time, due to the installation effect of the previous paragraph and the interference fit design of the sealing ring 3 and the end head 2, the end head 2 of this part of the tube body 1 cannot be directly and completely embedded in the bottom of the groove 4. Therefore, it is necessary to use a tool, such as a wrench, to rotate the screw 7 through the hexagonal boss, so that the two cooperation rings 5 ​​drive the two ends of the tube body 1 close to each other, so that the end head 2 extends into the inside of the groove 4, close to the bottom surface of the groove 4, and continue to squeeze the sealing ring 3 to a certain extent, thereby realizing the splicing and sealing of the two bellows parts. When disassembly is required, adjust the screw 7 and the fixing bolts 14 and reverse the operation.

[0030] The above description of the present invention and its embodiments is non-limiting. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by the above, and does not deviate from the purpose of the present invention, without inventive design, a structure and embodiment similar to the technical solution should fall within the scope of protection of the present invention.

Claims

1. A bellows structure for a downhole petroleum tool, comprising a tube body (1), the end of the tube body (1) being connected to an end cap (2), characterized in that: A sealing ring (3) is provided between the tube bodies (1), and both sides of the sealing ring (3) are connected with grooves (4) that match the end heads (2); The outer side of the tube body (1) is connected with a fastening mechanism, and the fastening mechanism includes a screw (7), a hexagonal protrusion (8) is connected at the center of the screw (7), and the external thread structures on both sides of the screw (7) are symmetrically arranged with the hexagonal protrusion (8) as the center. The two ends of the screw (7) are connected with a cooperation ring (5), and the screw (7) is rotatably connected to one side of the cooperation ring (5). The cooperation ring (5) is connected to the outer side of the end (2). A locking mechanism is connected between the end (2) and the cooperation ring (5), and a plurality of slide rods (10) that match the screw (7) are connected between the cooperation rings (5). The outer side of the cooperation ring (5) is connected with a plurality of support parts (6) that match the screw (7) and the slide rod (10) respectively.

2. The bellows structure for a downhole petroleum tool according to claim 1, characterized in that: The locking mechanism comprises a pad (13), a mounting groove (12) with a screw hole at the bottom is provided on the outer side of the end head (2), a mounting hole (11) is provided on the cooperation ring (5), the pad (13) is arranged in the mounting groove (12) and the mounting hole (11), and a fixing bolt (14) is provided between the end head (2) and the pad (13).

3. The bellows structure for a downhole petroleum tool according to claim 1, characterized in that: The end head (2) is engaged with the sealing ring (3) by being embedded in the groove (4).

4. The bellows structure for a downhole petroleum tool according to claim 1, characterized in that: Both ends of the screw rod (7) and the sliding rod (10) are connected with limiting plates (9).

5. The bellows structure for a downhole petroleum tool according to claim 2, characterized in that: The inner diameters of the mounting groove (12) and the mounting hole (11) are arranged to be consistent with each other, and the pad (13) is respectively engaged with the end head (2) and the cooperation ring (5) by being embedded in the mounting groove (12) and the mounting hole (11).

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