Novel corrugated pipe device

Abstract

The invention relates to a novel corrugated pipe device which comprises a corrugated pipe, a corrugated pipe upper connector, a corrugated pipe lower connector, a guide rod and a fixing steel sleeve, and the two ends of the corrugated pipe are fixedly connected with the corrugated pipe upper connector and the corrugated pipe lower connector in a sleeving mode respectively; the fixed steel sleeves are fixedly sleeved at two ends of the corrugated pipe; the guide rod is arranged in the corrugated pipe, meanwhile, one end of the guide rod is fixedly connected with the corrugated pipe lower connector, and the corrugated pipe upper connector is arranged on the guide rod in a sliding and sleeving mode; wherein the corrugated pipe is made of an acid-resistant gas material. According to the novel corrugated pipe device, the corrosion resistance and the high temperature resistance of the corrugated pipe can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of bellows, and particularly relates to a novel bellows device. Background Art

[0002] When a sonic logging tool works in a downhole environment of 175°C and 140 MPa, a metal bellows is usually used to compensate for pressure. As the temperature of the oil well gets higher and higher, the content of corrosive gases such as H 2 S and CO 2 will also increase continuously. When the metal bellows of the sonic instrument is corroded by acidic gases, leakage problems will frequently occur.

[0003] In order to solve the above technical problems, those skilled in the art urgently need to seek a novel bellows device to improve the corrosion resistance and high-temperature resistance of the bellows. Summary of the Invention

[0004] In order to solve all or part of the above problems, the object of the present invention is to provide a novel bellows device for improving the corrosion resistance and high-temperature resistance of the bellows.

[0005] The present application provides a novel bellows device, including: a bellows, an upper bellows joint, a lower bellows joint, a guide rod, and a fixed steel sleeve. The two ends of the bellows are respectively sleeved and fixedly connected to the upper bellows joint and the lower bellows joint; the fixed steel sleeve is sleeved and fixed at both ends of the bellows; the guide rod is arranged inside the bellows. At the same time, one end of the guide rod is fixedly connected to the lower bellows joint, and the upper bellows joint is slidably sleeved on the guide rod; wherein, the material of the bellows is an acid-resistant gas material.

[0006] In some embodiments, the bellows includes a middle corrugated portion and fixed portions at both ends of the middle corrugated portion. The fixed portions at both ends are used for fixedly connecting to the upper bellows joint and the lower bellows joint. A sealing ring surface and an internal thread structure are formed on the inner peripheral wall of the fixed portion, and a reduced-diameter step surface is formed on the outer peripheral wall of the fixed portion.

[0007] In some embodiments, a socket ring surface and an enlarged-diameter step surface are formed on the inner peripheral wall of the fixed steel sleeve, and the socket ring surface is in butt joint and cooperation with the reduced-diameter step surface.

[0008] In some embodiments, a plurality of radial threaded holes are formed on the socket ring surface, and a plurality of radial through holes are formed on the reduced-diameter step surface. The radial threaded holes correspond to the radial through holes. Among them, the novel bellows device further includes positioning set screws, and the positioning set screws are used for inserting into the radial threaded holes and the radial through holes.

[0009] In some embodiments, a threaded portion for threaded connection with the radial threaded hole and a plugging portion for plugging and cooperating with the radial through hole are formed on the positioning set screw.

[0010] In some embodiments, an axial guiding hole is formed inside the upper joint of the corrugated pipe.

[0011] In some embodiments, an annular sealing surface, an external thread portion, and a limiting annular vertical wall are sequentially formed along the axial direction on the outer peripheral wall of the upper joint of the corrugated pipe.

[0012] In some embodiments, an annular sealing surface, an external thread portion, and a limiting annular vertical wall are sequentially formed along the axial direction on the outer peripheral wall of the lower joint of the corrugated pipe.

[0013] In some embodiments, an axial oil injection channel is formed inside the lower joint of the corrugated pipe. One end of the oil injection channel is formed as an oil injection port, and the other end is formed as an internal thread hole for connecting with a guiding rod.

[0014] In some embodiments, a long oil path is formed in the axial direction of the guiding rod, and a plurality of radial oil paths communicating with the long oil path are formed in the radial direction of the guiding rod. The radial oil paths communicate with the inner cavity of the corrugated pipe.

[0015] As can be seen from the above technical solutions, the novel corrugated pipe device provided by the present invention has the following advantages: 1) The novel corrugated pipe device of the present invention has wide adaptability and can adapt to different environments by selecting different materials for the corrugated pipe; 2) The novel corrugated pipe device of the present invention selects more reliable sealing and connection methods to ensure the use of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the novel corrugated pipe device according to an embodiment of the present invention;

[0017] Figure 2 is a schematic structural diagram of the corrugated pipe according to an embodiment of the present invention;

[0018] Figure 3 is a schematic structural diagram of the upper joint of the corrugated pipe according to an embodiment of the present invention;

[0019] Figure 4 is a schematic structural diagram of the lower joint of the corrugated pipe according to an embodiment of the present invention;

[0020] Figure 5 is a schematic structural diagram of the fixed steel sleeve according to an embodiment of the present invention;

[0021] Figure 6 is a schematic structural diagram of the guiding rod according to an embodiment of the present invention;

[0022] Figure 7 is a schematic structural diagram of the positioning set screw according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] To better understand the purpose, structure, and function of the present invention, the following further describes a novel corrugated pipe device of the present invention in detail with reference to the accompanying drawings.

[0024] Figure 1 The structure of the novel corrugated pipe device 100 according to an embodiment of the present invention is shown. In combination with Figure 1 As shown, the novel corrugated pipe device 100 includes: a corrugated pipe 1, an upper joint 2 of the corrugated pipe, a lower joint 3 of the corrugated pipe, a guide rod 4, and a fixed steel sleeve 5. Both ends of the corrugated pipe 1 are respectively sleeved and fixedly connected to the upper joint 2 and the lower joint 3 of the corrugated pipe; the fixed steel sleeve 5 is sleeved and fixed at both ends of the corrugated pipe 1; the guide rod 4 is disposed inside the corrugated pipe 1. At the same time, one end of the guide rod 4 is fixedly connected to the lower joint 3 of the corrugated pipe, and the upper joint 2 of the corrugated pipe is slidably sleeved on the guide rod 4. Among them, the material of the corrugated pipe 1 is an acid-resistant gas material.

[0025] For the novel corrugated pipe device 100 according to an embodiment of the present invention, the material of the corrugated pipe 1 is an acid-resistant gas (H 2 S) material, such as polytetrafluoroethylene, that is, PTFE material. The PTFE material has strong H 2 S resistance. Through this setting, the novel corrugated pipe device 100 of the embodiment of the present invention can obtain the corrugated pipe 1 in the present application by hot molding or machining of the PTFE material. In this way, the PTFE corrugated pipe 1 can meet the well conditions of high temperature, high pressure, and high gas content (H 2 S and CO 2 ) underground. In some other embodiments, the corrugated pipe 1 can also be made of other materials to adapt to different environmental requirements.

[0026] Please refer to Figure 2 , in some embodiments, the corrugated pipe 1 may include a middle corrugated part 11 and fixed parts 12 located at both ends of the middle corrugated part 11. The fixed parts 12 at both ends are fixedly connected to the upper joint 2 and the lower joint 3 of the corrugated pipe. A sealing ring surface 121 and an internal thread structure 122 are formed on the inner peripheral wall of the fixed part 12, and a reduced-diameter step surface 123 is formed on the outer peripheral wall of the fixed part 12.

[0027] In the present application, the internal thread structure 122 is located on the outer side of the fixed part 12, and the sealing ring surface 121 is located on the inner side of the fixed part 12. The sealing ring surface 121 is sealingly sleeved with the upper joint 2 and the lower joint 3 of the corrugated pipe. The internal thread structure 122 is threadedly connected to the upper joint 2 and the lower joint 3 of the corrugated pipe. Through this setting, the assembly of the corrugated pipe 1 can be facilitated.

[0028] Please refer to Figure 5 , in some embodiments, a socket ring surface 51 and an enlarged-diameter step surface 52 may be formed on the inner peripheral wall of the fixed steel sleeve 5, and the socket ring surface 51 is in abutting fit with the reduced-diameter step surface 123.

[0029] Please refer to Figure 5 and Figure 7 , in some embodiments, a plurality of radial threaded holes 511 may be formed on the socket toroidal surface 51, and a plurality of radial through holes 124 may be formed on the reduced-diameter stepped surface 123. The radial threaded holes 511 correspond to the radial through holes 124. Among them, the novel corrugated pipe device 100 further includes a positioning set screw 6, and the positioning set screw 6 is used to be inserted into the radial threaded holes 511 and the radial through holes 124.

[0030] In this application, the reduced-diameter stepped surfaces 123 at both ends of the corrugated pipe 1 cooperate with the socket toroidal surface 51 of the fixed steel sleeve 5. In this way, the thermal expansion amount of the fixed steel sleeve 5 in a high-temperature environment is small, the size of the inner hole sealing surface of the corrugated pipe 1 can be maintained, and the sealing stability is ensured. A plurality of radial through holes 124 are formed on the reduced-diameter stepped surface 123 of the corrugated pipe 1, and a plurality of radial threaded holes 511 are formed on the socket toroidal surface 51 of the fixed cylinder sleeve. The radial threaded holes 511 correspond to the radial through holes 124. The fixed cylinder sleeve and the corrugated pipe 1 are circumferentially fixed on the upper joint 2 and the lower joint 3 of the corrugated pipe through the positioning set screw 6, which is convenient, fast and simple to operate.

[0031] Please continue to refer to Figure 7 , in some embodiments, the positioning set screw 6 may be formed with a threaded portion 61 threadedly connected to the radial threaded hole 511 and a plugging portion 62 plugging and cooperating with the radial through hole 124.

[0032] Please refer to Figure 3 , in some embodiments, an axial guide hole 21 may be formed inside the upper joint 2 of the corrugated pipe.

[0033] Please continue to refer to Figure 3 , in some embodiments, an annular sealing surface 22, an external thread portion 23 and a limiting annular vertical wall 24 may be sequentially formed on the outer peripheral wall of the upper joint 2 of the corrugated pipe along the axial direction.

[0034] In some embodiments, an annular sealing surface 31, an external thread portion 32 and a limiting annular vertical wall 33 may be sequentially formed on the outer peripheral wall of the lower joint 3 of the corrugated pipe along the axial direction.

[0035] Please refer to Figure 4 , in some embodiments, an axial oil injection channel 34 may be formed inside the lower joint 3 of the corrugated pipe. One end of the oil injection channel 34 may be formed as an oil injection port 35, and the other end may be formed as an internal threaded hole 36, and the internal threaded hole 36 is used to be connected to the guide rod 4.

[0036] Please refer to Figure 6 , in some embodiments, a long oil path 41 may be formed in the axial direction of the guide rod 4, and a plurality of radial oil paths 42 communicating with the long oil path 41 may be formed in the radial direction of the guide rod 4. The radial oil paths 42 communicate with the inner cavity of the corrugated pipe 1.

[0037] In this application, the internal thread structures 122 at both ends (fixed parts 12) of the corrugated pipe 1 are respectively in external thread engagement with the upper corrugated pipe joint 2 and the lower corrugated pipe joint 3. During the thread engagement process, the sealing ring surfaces 121 at both ends cooperate with the annular sealing surfaces 22 (31) of the upper corrugated pipe joint 2 (lower corrugated pipe joint 3) and the sealing rings to form a sealing effect. The lower corrugated pipe joint 3 is provided with an oil injection port 35 and an oil injection channel 34, and the guide rod 4 is provided with a long oil path 41 and a radial oil path 42.

[0038] Through the above settings, a rich oil path can be formed, so as to ensure that the oil liquid can quickly fill the entire inner cavity of the corrugated pipe 1 during the oil injection process. In addition, because the corrugated pipe 1 is thin in thickness and small in rigidity, in order to ensure that the upper corrugated pipe joint 2 and the lower corrugated pipe joint 3 can always maintain axial concentricity, it is necessary to use the guide rod 4 for axial guidance to adapt to the axial expansion and contraction of the corrugated pipe 1. One end of the guide rod 4 has an external thread that cooperates with the internal thread hole of the lower corrugated pipe joint 3, and the other end of the guide rod 4 is a slender rod that cooperates with the guide hole of the upper corrugated pipe joint 2.

[0039] It should be noted that unless otherwise specified, the technical terms or scientific terms used in this application should have the ordinary meaning understood by those skilled in the art to which this invention belongs.

[0040] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "length", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0041] In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the present invention, the meaning of "a plurality" is more than two unless otherwise specifically defined.

[0042] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present invention, and they should all be covered within the scope of the claims and the specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A novel bellows device, characterized in that: include: A bellows, an upper bellows joint, a lower bellows joint, a guide rod and a fixed steel sleeve, wherein the two ends of the bellows are respectively sleeved and fixedly connected to the upper bellows joint and the lower bellows joint; the fixed steel sleeve is sleeved and fixed on the two ends of the bellows; the guide rod is arranged in the bellows, and at the same time, one end of the guide rod is fixedly connected to the lower bellows joint, and the upper bellows joint is slidably sleeved on the guide rod; wherein the material of the bellows is acid gas resistant material.

2. The novel bellows device according to claim 1 is characterized in that: The bellows includes a middle corrugated portion and fixed portions located at both ends of the middle corrugated portion, the fixed portions at both ends are used to be fixedly connected to the upper joint of the bellows and the lower joint of the bellows, the inner circumferential wall of the fixed portion is formed with a sealing ring surface and an internal thread structure, and the outer circumferential wall of the fixed portion is formed with a reduced diameter step surface.

3. The novel bellows device according to claim 2 is characterized in that: The inner peripheral wall of the fixed steel sleeve is formed with a sleeve annular surface and a diameter expansion step surface, and the sleeve annular surface is abutted and matched with the diameter reduction step surface.

4. The novel bellows device according to claim 3 is characterized in that: A plurality of radial threaded holes are formed on the sleeve ring surface, and a plurality of radial through holes are formed on the reduced diameter step surface, wherein the radial threaded holes correspond to the radial through holes, wherein the novel bellows device further comprises a positioning screw, and the positioning screw is used to be inserted into the radial threaded holes and the radial through holes.

5. The novel bellows device according to claim 4 is characterized in that: The positioning top screw is formed with a threaded portion threadedly connected to the radial threaded hole and an inserting portion inserted and matched with the radial through hole.

6. The novel bellows device according to any one of claims 1 to 5, characterized in that: An axial guide hole is formed inside the upper joint of the bellows.

7. The novel bellows device according to claim 6 is characterized in that: An annular sealing surface, an external threaded portion and a limiting annular vertical wall are sequentially formed along the axial direction on the outer peripheral wall of the bellows upper joint.

8. The novel bellows device according to any one of claims 1 to 5, characterized in that: An annular sealing surface, an external threaded portion and a limiting annular vertical wall are sequentially formed along the axial direction on the outer peripheral wall of the bellows lower joint.

9. The novel bellows device according to claim 8, characterized in that: An axial oil injection channel is formed inside the bellows lower joint, one end of the oil injection channel is formed as an oil injection port, and the other end is formed as an internal threaded hole, and the internal threaded hole is used to be connected to the guide rod.

10. The novel bellows device according to any one of claims 1 to 5, characterized in that: A long oil path is formed in the axial direction of the guide rod, and a plurality of radial oil paths connected with the long oil path are formed in the radial direction of the guide rod, and the radial oil paths are connected with the inner cavity of the bellows.

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