Oil and gas pipeline plug type plugging sealing element and oil and gas pipeline plug type plugging device

Abstract

The utility model relates to the technical field of oil and gas pipeline plugging, and provides an oil and gas pipeline plug-type plugging sealing element and an oil and gas pipeline plug-type plugging device, the oil and gas pipeline plug-type plugging sealing element is matched with a plugging head and used for plugging a pipeline, the oil and gas pipeline plug-type plugging sealing element comprises a sealing structure and a base, and a closure sealing part belongs to a bowl-shaped structure. The pipeline medium is cut off, primary sealing can be achieved to a certain extent, the compression sealing part is composed of a plurality of sealing rings, after the pipeline medium is cut off, sealed and isolated and sealing is achieved to a certain extent, secondary sealing is achieved through compression of the multiple sealing rings by the inner wall of the pipeline, the pipeline medium is completely sealed, and the reinforcing ribs are embedded into the reinforcing rib containing grooves. The supporting stability of the base is improved, meanwhile, the contact area of the base and the sealing structure is increased, and therefore the vulcanization bonding area is increased, the risk that the connecting face of the sealing structure and the base is torn under high-pressure operation is reduced, and then the damage resistance of the whole plug type plugging sealing piece is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil and gas pipeline plugging technical field more specifically, relate to a kind of oil and gas pipeline plug type plugging sealing element and oil and gas pipeline plug type plugging device. BACKGROUND

[0002] In the maintenance and reconstruction construction of oil and gas pipeline, plug type plugging technology, as a common pipeline plugging means, has been widely used in the repair and emergency rescue of natural gas, refined oil and crude oil pipelines. Its main function is to temporarily block the medium flow of a certain section of the pipeline, to ensure that the pipeline is not leaking during maintenance, cleaning, detection or replacement, and to ensure the safety of the construction process and the stability of the pipeline operation.

[0003] The basic principle of plug type plugging is to install a plugging device inside the pipeline, and by sending a plugging head with a plugging bowl into the pipeline, an appropriate pressure is generated between the inner wall of the pipeline and the plugging bowl, and the plugging bowl is elastically expanded to form a seal with the inner wall of the pipeline, blocking the flow of pipeline medium. The plugging bowl is usually made of rubber, with an outer diameter slightly larger than the inner diameter of the pipeline, and the sealing effect is achieved by compression with the inner wall of the pipeline.

[0004] Although the existing plug type plugging technology has achieved certain results in practical application, there are still several significant problems, especially in high-pressure, highly corrosive or poor pipeline conditions: (1) poor sealing performance: when there is a certain ovality, pit corrosion, iron accumulation or oil sludge accumulation on the inner wall of the pipeline, the traditional plugging bowl often cannot form a reliable seal. Due to the limited elasticity and deformation range of the rubber bowl, it cannot adapt to complex or irregular pipeline inner walls, resulting in poor sealing effect, and even medium leakage, which seriously affects the safety of construction; (2) plugging bowl is easily damaged: the traditional plugging bowl is usually made of rubber and cloth layer composite material, and the main function of the cloth layer is to enhance the structural strength of the bowl. However, in high-pressure or high-stress environments, the cloth layer between the rubber layer and the plugging bowl is prone to tearing or separation, causing plugging failure, which not only affects the sealing tightness, but also may cause construction accidents if the plugging bowl cannot be completely removed after tearing. Especially in high-pressure pipeline construction, the working stress of the plugging bowl is large, and the durability and reliability of the material are greatly tested; (3) plugging bowl wear and instability: during the plugging operation, the plugging bowl may be worn by the roughness, corrosion or foreign matter on the inner wall of the pipeline, causing damage or aging of the bowl, which affects the plugging effect and service life. Especially when there are corrosion pits or protrusions on the inner wall of the pipeline, the traditional plugging bowl is easily affected by local concentrated stress, causing structural damage or failure, increasing the frequency of maintenance and replacement. How to improve the sealing performance of plug type plugging, enhance the durability and damage resistance of plugging bowl, become a technical problem to be solved urgently.

[0005] Therefore, there is an urgent need to provide an oil and gas pipeline plug type plugging and sealing device to solve the above problems. Utility model content

[0006] The utility model discloses a kind of oil and gas pipeline plug type plugging and sealing, to reach the effect of improving the sealing property, durability and damage resistance of plug type plugging and sealing.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] An oil and gas pipeline plug type plugging and sealing, the oil and gas pipeline plug type plugging and sealing cooperate with plugging head, for plugging pipeline, the oil and gas pipeline plug type plugging and sealing includes:

[0009] Sealing structure, at least two first installation holes are provided on the sealing structure, and the at least two first installation holes are distributed along the circumference of the sealing structure;

[0010] Base, the base is coaxial with the sealing structure and vulcanization bonding, at least two second installation holes are provided on the base, the number of the second installation hole is equal to the number of the first installation hole and one-to-one correspondence, the side of the base away from the sealing structure is the first surface, the side of the base towards the sealing structure is the second surface, the diameter of the first surface is smaller than the inner diameter of the pipeline, the second surface is provided with a reinforcing rib, the reinforcing rib is distributed along the circumference of the base, and the reinforcing rib is distributed on the side away from the hole wall of the second installation hole along the radial direction of the base;

[0011] The sealing structure includes a cutoff sealing part and a compression sealing part, the cutoff sealing part is in the shape of a bowl, the side of the cutoff sealing part towards the base is provided with a reinforcing rib accommodating groove, the reinforcing rib is embedded in the reinforcing rib accommodating groove, the inner wall of the compression sealing part is fixedly connected with the outer wall of the cutoff sealing part, and the compression sealing part includes a plurality of sealing rings.

[0012] Preferably, the side of the base towards the cutoff sealing part is provided with a first inclined surface, one side of the first inclined surface is fixedly connected with the reinforcing rib, the other side of the first inclined surface extends in the direction away from the cutoff sealing part along the axial direction of the base, the side of the cutoff sealing part towards the base is provided with a second inclined surface, one side of the second inclined surface is fixedly connected with the groove wall of the reinforcing rib accommodating groove, and the second inclined surface is in contact with the first inclined surface.

[0013] Preferably, the inclination angle of the other side of the first inclined surface in the direction away from the cutoff sealing part along the axial direction of the base is 20°-25°.

[0014] Preferably, the outer surface of the base is provided with a third inclined surface, one side of the third inclined surface is connected with the first surface, and the other side of the third inclined surface extends in the direction away from the reinforcing rib along the radial direction of the base.

[0015] The fourth inclined surface is fixedly connected with one side of the third inclined surface, and the other side of the fourth inclined surface extends away from the reinforcing rib along the radial direction of the sealing structure.

[0016] Preferably, the diameters of the plurality of sealing rings gradually increase along the axial direction of the pipeline away from the base, and the largest diameter of the plurality of sealing rings is connected to form a fifth inclined surface, and the fifth inclined surface has an inclination angle of 5-10° with respect to the inner wall of the pipeline along the axial direction of the sealing structure.

[0017] Preferably, the fourth inclined surface is fixedly connected with one side of the third inclined surface, and the other side of the fourth inclined surface extends away from the reinforcing rib along the radial direction of the sealing structure.

[0018] Preferably, the fourth inclined surface is fixedly connected with one side of the third inclined surface, and the other side of the fourth inclined surface extends away from the reinforcing rib along the radial direction of the sealing structure.

[0019] Preferably, the reinforcing rib is in the shape of a ring, the reinforcing rib accommodating groove is in the shape of a ring, and the reinforcing rib and the reinforcing rib accommodating groove are coaxial with the base.

[0020] Preferably, the base is made of rubber and aramid cloth composite material, and the sealing structure is made of rubber.

[0021] Another purpose of the utility model is to provide an oil and gas pipeline plug type plugging device to improve the sealing performance, durability and damage resistance of the plug type plugging sealing element in the plug type plugging device.

[0022] To achieve the above purpose, the utility model adopts the following technical scheme.

[0023] An oil and gas pipeline plug type plugging device comprises a plugging head, a plugging driving device and the oil and gas pipeline plug type plugging sealing element, the plugging head is connected with the oil and gas pipeline plug type plugging sealing element through bolts, and the plugging driving device is used for sending the plugging head provided with the oil and gas pipeline plug type plugging sealing element to the inside of the pipeline.

[0024] The utility model has the advantages of:

[0025] The utility model provides a kind of oil and gas pipeline plug type plugging sealing element and oil and gas pipeline plug type plugging device, oil and gas pipeline plug type plugging sealing element is cooperated with plugging head, for plugging pipeline, oil and gas pipeline plug type plugging sealing element includes sealing structure and base, at least two first installation holes are equipped on sealing structure, at least two first installation holes are distributed along the circumference of sealing structure;Base is coaxial with sealing structure and vulcanization bonding, at least two second installation holes are equipped on base, the number of second installation hole and first installation hole is equal and one-to-one correspondence, the side of base deviating from sealing structure is first surface, the side of base towards sealing structure is second surface, the diameter of first surface is less than the inner diameter of pipeline, reinforcing rib is equipped on second surface, reinforcing rib is distributed along the axial direction of base, along the radial direction of base, reinforcing rib is distributed on the side deviating from second installation hole hole wall;Sealing structure includes intercepting sealing part and compression sealing part, intercepting sealing part is bowl-shaped, the side of intercepting sealing part towards base is equipped with reinforcing rib accommodating groove, reinforcing rib is embedded in reinforcing rib accommodating groove, the inner wall of compression sealing part is fixedly connected with the outer wall of intercepting sealing part, compression sealing part includes multiple sealing rings, the diameter of multiple sealing rings is all greater than the inner diameter of pipeline, realize the interference fit of sealing ring and pipeline inner wall, so that sealing effect is better.Intercepting sealing part is bowl-shaped structure, while intercepting pipeline medium, it can also realize primary sealing to a certain extent, compression sealing part is composed of multiple sealing rings, after pipeline medium is intercepted and sealed and a certain degree of sealing is realized, secondary sealing is realized by the compression of multiple sealing rings to pipeline inner wall, to completely seal pipeline medium.Through the combination of primary and secondary sealing, ensure that pipeline medium is completely isolated, prevent leakage.Reinforcing rib is embedded in reinforcing rib accommodating groove, improve the stability of base support, at the same time, increase the contact area of base and sealing structure, thereby increase vulcanization bonding area, reduce the risk of tearing of sealing structure and base connecting surface under high pressure operation, and then improve the damage resistance of the whole plug type plugging sealing element. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The structure diagram of oil and gas pipeline plug type plugging sealing element provided for the embodiment is shown in the figure.

[0027] Figure 2 The structure diagram of oil and gas pipeline plug type plugging sealing element provided for the embodiment is shown in the figure. Figure 1 The middle line A-A direction view is shown in the figure.

[0028] Figure 3 The structure diagram of oil and gas pipeline plug type plugging sealing element provided for the embodiment is shown in the figure. Figure 2 The enlarged view of middle B is shown in the figure.

[0029] In the figure:

[0030] 1, seal structure; 11, intercept seal part; 111, fourth inclined surface; 112, sixth inclined surface; 113, tangent plane; 12, compression seal part; 121, seal ring; 122, fifth inclined surface; 13, seal ring; 14, positioning installation groove; 2, base; 21, second installation hole; 22, reinforcing rib; 23, first inclined surface; 24, third inclined surface. DETAILED DESCRIPTION

[0031] The utility model will be described in further detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, and are not limited to the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for ease of description, not all structures.

[0032] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0033] In the utility model, unless otherwise explicitly specified and limited, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0034] In the description of the embodiment, the terms "up", "down", "right", etc. orientation or position relationship is based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in description, and have no special meaning.

[0035] The embodiment provides a plug-type plugging and sealing device for an oil and gas pipeline, which overcomes the defects of conventional plugging and sealing devices in a high-pressure environment by optimizing the structure of the base 2 and the cooperation between the base 2 and the sealing structure 1, improves the sealing performance, and increases the durability and operation safety of the plug-type plugging and sealing device.

[0036] Specifically, as shown in the drawings, a plug-type plugging and sealing device for an oil and gas pipeline is used for plugging a pipeline and is matched with a plugging head, and the plug-type plugging and sealing device comprises a sealing structure 1 and a base 2. Figures 1 to 3 The sealing structure 1 is provided with at least two first mounting holes which are distributed in the circumferential direction of the sealing structure 1; the base 2 is coaxial with the sealing structure 1 and is vulcanized and bonded, the base 2 is provided with at least two second mounting holes 21 which are equal in number and one-to-one corresponding to the first mounting holes, one side of the base 2 away from the sealing structure 1 is a first surface, one side of the base 2 towards the sealing structure 1 is a second surface, the diameter of the first surface is smaller than the inner diameter of the pipeline, the second surface is provided with a reinforcing rib 22 which is distributed in the circumferential direction of the base 2 and is distributed on one side away from the hole wall of the second mounting hole 21 in the radial direction of the base 2; the sealing structure 1 comprises a shut-off sealing part 11 and a compression sealing part 12, the shut-off sealing part 11 is in a bowl shape, one side of the shut-off sealing part 11 towards the base 2 is provided with a reinforcing rib accommodating groove, the reinforcing rib 22 is embedded in the reinforcing rib accommodating groove, the inner wall of the compression sealing part 12 is fixedly connected with the outer wall of the shut-off sealing part 11, the compression sealing part 12 comprises a plurality of sealing rings 121, the diameters of the plurality of sealing rings 121 are all greater than the inner diameter of the pipeline, the interference fit between the sealing rings 121 and the inner wall of the pipeline is realized, the sealing effect is better, the plurality of sealing rings 121 can improve the plugging tightness and further guarantee the fire safety. The reinforcing rib 22 is embedded in the reinforcing rib accommodating groove, the stability of the support of the base 2 is improved, at the same time, the contact area between the base 2 and the sealing structure 1 is increased, the vulcanization bonding area is increased, the bonding stability of the base 2 and the sealing structure 1 is improved, so that the risk of tearing of the connecting surface between the sealing structure 1 and the base 2 under high-pressure operation is reduced, and the damage resistance of the entire plug-type plugging and sealing device is improved. In addition, the diameter of the first surface is designed to be smaller than the inner diameter of the pipeline, so that the smooth advancement of the plug-type plugging and sealing device in the pipeline can be ensured, and the problems of inclination or jamming of the plugging and sealing device caused by irregular pipelines are avoided, therefore, in the advancement process of the plug-type plugging and sealing device, the shape of the base 2 not only provides a supporting effect but also plays a guiding role. After the plug-type plugging and sealing device enters the inside of the pipeline, the bowl-shaped structure of the shut-off sealing part 11 can realize the shut-off effect on the medium in the pipeline, when the medium in front of the plugging is vented, the pressure generated by the shut-off medium will act on the inner wall of the bowl-shaped structure, so that the outer wall of the bowl-shaped structure and the inner wall of the pipeline are more closely attached, the shut-off of the medium in the pipeline is realized, and sealing is also realized to a certain extent.

[0037] In the embodiment, the number of the first mounting holes and the second mounting holes 21 is 6, and in other embodiments, the number of the first mounting holes and the second mounting holes 21 is 2, 8, or 20, etc. It should be noted that the diameter and center distance of the first mounting holes and the second mounting holes 21 are designed according to the size parameters of the corresponding specification plug. In the embodiment, the number of the sealing rings 121 is 3, and in other embodiments, the number of the sealing rings 121 can be 4, 5, or 6, etc. In other embodiments, the base 2 and the sealing structure 1 can also be bonded by plasma treatment.

[0038] Further, the bottom of the bowl-shaped structure is provided with a positioning installation groove 14 and a sealing ring 13. The positioning installation groove 14 is used to install the entire plug-type plugging and sealing piece on the plug, and it should be noted that the size of the positioning installation groove 14 is designed according to the size parameters of the corresponding specification plug. The sealing ring 13 is used to form a seal between the plug and the plug-type plugging and sealing piece. After the plug-type plugging and sealing piece is installed, the sealing ring 13 is compressed by bolt fastening to achieve the sealing of the connection surface between the plug-type plugging and sealing piece and the plug.

[0039] Further, the reinforcing rib 22 is circular, the reinforcing rib receiving groove is an annular groove, the reinforcing rib 22 and the reinforcing rib receiving groove are coaxial with the base 2, and the reinforcing rib 22 is fixedly connected with the base 2. In the embodiment, the reinforcing rib 22 and the base 2 are integrally formed by a molding process, and in other embodiments, the reinforcing rib 22 and the base 2 can be vulcanized and bonded. In other embodiments, the reinforcing rib 22 can be three protrusions distributed circumferentially along the base 2, and the reinforcing rib receiving groove is three grooves distributed circumferentially along the sealing structure 1, and the protrusions and the grooves correspond one by one.

[0040] Optionally, the base 2 is a rubber and aramid cloth composite product, and the sealing structure 1 is a rubber product. Since the entire plug-type plugging and sealing piece needs to withstand a large pressure from the high-pressure medium in the pipeline during use, the base 2 (including the reinforcing rib 22) adopts a rubber and aramid cloth composite material, so that the base 2 has sufficient strength and pressure resistance performance and is not easy to break, improving the high-temperature resistance, aging resistance, and strength of the plug-type plugging and sealing piece, and adapting to the harsh environment of the oil and gas pipeline. In addition, the sealing structure 1 has excellent sealing and wear resistance due to the use of rubber material. In other embodiments, the sealing structure 1 can also be a silicone material.

[0041] Optionally, the diameters of the plurality of sealing rings 121 gradually increase in the axial direction of the pipeline away from the base 2, and the largest diameter of the plurality of sealing rings 121 is connected to form a fifth inclined surface 122, and the inclination angle γ of the fifth inclined surface 122 relative to the inner wall of the pipeline is 5°-10° in the axial direction of the sealing structure 1. The diameters of the plurality of sealing rings 121 gradually decrease in the direction of advancement in the pipeline, and the top of the plurality of sealing rings 121 forms the fifth inclined surface 122, so that each sealing ring 121 can gradually contact and seal with the inner wall of the pipeline when entering the pipeline. When the plug-type blocking and sealing element advances, the sealing ring 121 with a smaller diameter first contacts the inner wall of the pipeline to form a preliminary seal, and then the sealing ring 121 with a larger diameter is gradually compressed to provide a more stable sealing effect. This design can effectively reduce the friction between the plug-type blocking and sealing element and the inner wall of the pipeline, improve the smoothness of the plug-type blocking and sealing element when advancing in the pipeline, and avoid the phenomenon of jamming caused by too large diameter difference between the sealing rings 121. In addition, the gradually increasing structure of the plurality of sealing rings 121 also ensures that the sealing ring 121 can gradually release pressure and smoothly exit the pipeline when the plug-type blocking and sealing element is withdrawn from the pipeline, thereby avoiding the case of excessive resistance when the plug-type blocking and sealing element moves reversely in the pipeline, and avoiding the risk of jamming or damage. By designing the gradually increasing structure of the plurality of sealing rings 121, the plug-type blocking and sealing element can advance and exit more smoothly and stably in the pipeline, effectively reducing friction, avoiding jamming, and improving sealing effect, thereby ensuring the sealing performance and construction safety during the plugging process of the oil and gas pipeline. This design enables the plug-type blocking and sealing element to work stably even in complex pipeline conditions, avoiding common problems such as jamming, damage or poor sealing in traditional technology, and further improving the overall reliability and efficiency of the plug-type blocking and sealing element. In this embodiment, the inclination angle of the fifth inclined surface 122 relative to the inner wall of the pipeline is 8°, and in other embodiments, the inclination angle of the fifth inclined surface 122 relative to the inner wall of the pipeline can be 5°, 7° or 10°.

[0042] Optionally, the side of the base 2 facing the intercepting sealing part 11 is provided with a first inclined surface 23, one side of the first inclined surface 23 is fixedly connected with the reinforcing rib 22, and the other side of the first inclined surface 23 extends away from the intercepting sealing part 11 in the axial direction of the base 2. The side of the intercepting sealing part 11 facing the base 2 is provided with a second inclined surface, one side of the second inclined surface is fixedly connected with the groove wall of the reinforcing rib receiving groove, and the second inclined surface is in contact with the first inclined surface 23. The second inclined surface and the first inclined surface 23 cooperate to form a compression space for the sealing ring 121, further improving the compression sealing effect of the sealing ring 121.

[0043] Further, the other side of the first inclined surface 23 is inclined at an angle a of 20-25° away from the direction of the intercepting sealing part 11 along the axial direction of the base 2, further ensuring that the sealing structure 1 has a vulcanized bonding area with the base 2, providing effective support, and effectively increasing the compression space of the sealing ring 121. In the embodiment, the other side of the first inclined surface 23 is inclined at an angle of 23° away from the direction of the intercepting sealing part 11, and in other embodiments, the other side of the first inclined surface 23 can be inclined at an angle of 20°, 22° or 25° away from the direction of the intercepting sealing part 11.

[0044] Optionally, the outer surface of the base 2 is provided as a third inclined surface 24, one side of the third inclined surface 24 is connected with the first surface, and the other side of the third inclined surface 24 extends away from the direction of the reinforcing rib 22 along the radial direction of the base 2; the intercepting sealing part 11 is provided with a fourth inclined surface 111, one side of the fourth inclined surface 111 is fixedly connected with the other side of the third inclined surface 24, the other side of the fourth inclined surface 111 extends away from the direction of the reinforcing rib 22 along the radial direction of the sealing structure 1, and the third inclined surface 24 and the fourth inclined surface 111 are inclined at an angle β of 20-30° with respect to the inner wall of the pipeline along the axial direction of the sealing structure 1. When the sealing structure 1 is installed on the base 2, the third inclined surface 24 and the fourth inclined surface 111 are on the same plane, further ensuring that the plug-type plugging sealing element has a good guiding effect when advancing in the pipeline. In the embodiment, the third inclined surface 24 and the fourth inclined surface 111 are each inclined at an angle of 25° with respect to the inner wall of the pipeline, and in other embodiments, the third inclined surface 24 and the fourth inclined surface 111 can each be inclined at an angle of 20°, 24° or 30° with respect to the inner wall of the pipeline.

[0045] Optionally, the intercepting sealing part 11 is further provided with a sixth inclined surface 112, one side of the sixth inclined surface 112 is connected with the sealing ring 121 having the largest diameter among the plurality of sealing rings 121, the other side of the sixth inclined surface 112 extends away from the direction of the reinforcing rib 22 along the radial direction of the sealing structure 1, and the sixth inclined surface 112 is inclined at an angle θ of 20-25° with respect to the inner wall of the pipeline along the axial direction of the sealing structure 1. The sixth inclined surface 112 not only ensures the smoothness of the plug-type plugging sealing element advancing in the pipeline, but also provides an effective action surface for the pipeline medium, making the sealing effect better.

[0046] Optionally, along the axial direction of the sealing structure 1, the side of the intercepting sealing part 11 away from the base 2 is provided with a cutting surface 113 parallel to the first surface, and the width of the cutting surface 113 is 3mm-8mm. If the upper outer wall of the intercepting sealing part 11 and the inner wall of the intercepting sealing part 11 are provided with a pointed portion at the intersection of the tail, the tapered pointed portion is relatively fragile. During the retreat of the plug-type plugging sealing element in the pipeline, the pointed portion is easily torn or flanged when being extruded and rubbed by the inner wall of the pipeline, which not only affects the integrity of the plug-type plugging sealing element, but also affects the retreat operation of the plug-type plugging sealing element due to the extrusion and rubbing of the flanged pointed portion. Along the axial direction of the sealing structure 1, the outer wall of the intercepting sealing part 11 away from the base 2 and the inner wall of the intercepting sealing part 11 are provided with a cutting surface 113 at the intersection in the radial direction, so that the intersection is designed as a circular surface with a certain width, thereby improving the extrusion and rubbing resistance of the intercepting sealing part 11. In this embodiment, the width of the cutting surface 113 is 6mm, and in other embodiments, the width of the cutting surface 113 is 3mm, 5mm or 8mm.

[0047] The plug-type plugging sealing element is integrally formed by a film pressing forming process, and after pressing, there should be no pores, impurities, smooth surface, no defects such as flash, burr and crack in the sealing part. It has been verified that the plug-type plugging sealing element provided in this embodiment has a maximum working pressure of 10MPa, a maximum working temperature of 80℃, and can be used for sealing of media such as crude oil, natural gas and finished oil; the plug-type plugging sealing element has a tensile strength of >12MPa, a tensile elongation of >300-320%, a temperature resistance of -30℃-120℃, an oil weight gain resistance of <8%; a tensile strength reduction rate of <12%, a tensile elongation reduction rate of <15%, a rubber layer and a cloth layer of >15N / cm, a cloth layer and a cloth layer of >18N / cm, a sealing part hardness of 58°A-62°A, and a boss-type support base 2 hardness of 63°A-67°A.

[0048] This embodiment also provides an oil and gas pipeline plug-type plugging device to improve the sealing performance, durability and damage resistance of the plug-type plugging sealing element in the plug-type plugging device.

[0049] Specifically, an oil and gas pipeline plug-type plugging device includes a plugging head, a plugging driving device and the above-mentioned oil and gas pipeline plug-type plugging sealing element. The plugging head is connected with the oil and gas pipeline plug-type plugging sealing element by bolts, and the plugging driving device is used to send the plugging head provided with the oil and gas pipeline plug-type plugging sealing element to the inside of the pipeline. The plug-type plugging sealing element includes a base 2, an intercepting sealing part 11 and a compression sealing part 12. The design of the reinforcing ribs 22 enhances the support capacity of the plug-type plugging sealing element, the intercepting sealing part 11 provides preliminary sealing, and the compression sealing part 12 further enhances the sealing effect of the plug-type plugging sealing element.

[0050] The plug-type plugging sealing element provided in this embodiment is used for plugging as follows:

[0051] S1. Installation step: Install the plug-type plugging seal on the plugging head (not shown in the figure). The installation structure of the plug-type plugging seal is designed with a positioning installation groove 14 and a sealing ring 13, which ensures accurate installation and tight fit with the connecting surface of the plugging head. During installation, the sealing ring 13 is compressed by bolt fastening, thereby achieving effective sealing of the plug-type plugging seal and the connecting surface of the plugging head.

[0052] S2. Pipeline delivery: The installed plugging head (with plug-type plugging seal) is delivered into the pipeline by the plugging cylinder. The plugging device provides the necessary pushing force and positioning ability to ensure that the plugging head can smoothly enter the pipeline and gradually advance along the designed trajectory. At this time, the guide wheels on the plugging head guide the plugging head forward, and the plugging head is delivered into the predetermined plugging position inside the pipeline using the plugging head's matching positioning device.

[0053] S3. Sealing by compression: When the plug-type plugging seal reaches the target position and starts working, the base 2 first supports the pressure generated by the medium inside the pipeline. The base 2 is designed with a certain strength to withstand the pressure from the medium inside the pipeline. After the plugging head enters the pipeline and advances to a certain distance, the plug-type plugging seal gradually comes into contact with the inner wall of the pipeline. When the plug-type plugging seal advances to the working position perpendicular to the pipeline axis, the pressure inside the pipeline causes compression of the plug-type plugging seal. At this time, the pressure of the medium inside the pipeline promotes the closer contact between the shut-off sealing part 11 (usually a rubber part with a bowl-shaped structure) and the inner wall of the pipeline, thereby completing the primary sealing and effectively isolating the medium flow inside the pipeline.

[0054] S4. Secondary sealing formation: After the primary sealing is formed, the plug-type plugging seal continues to work under the compression of the inner wall of the pipeline. At this time, the interference fit between the multiple sealing rings 121 and the inner wall of the pipeline begins to play a role. This fit generates a certain compression force between the sealing rings 121 and the inner wall of the pipeline, thereby ensuring the formation of secondary sealing. Through the multi-layer structure of the sealing rings 121, the plug-type plugging seal forms multiple plugging inside the pipeline, effectively preventing leakage of the pipeline medium.

[0055] S5. Complete sealing of the pipeline: Through the primary shut-off sealing and the interference fit of the secondary sealing rings 121, the plug-type plugging seal can completely seal the pipeline medium, ensuring that the medium inside the pipeline does not leak during the plugging process. This provides safety assurance for the hot work of oil and gas pipelines and avoids safety hazards such as fire or explosion.

[0056] The plug-type plugging seal achieves plugging of the oil and gas pipeline in the following way:

[0057] The base 2 supports the pressure brought by the pipeline medium, ensures the stability of the whole plugging process; the intercepting sealing part 11 realizes the first level sealing to a certain extent through the action of the pressure in the pipeline; the multiple sealing rings 121 form the second level sealing between the inner wall of the pipeline and the plug plugging sealing piece through interference fit, so as to realize complete sealing. The multiple sealing function of the design structure ensures that the oil and gas medium in the pipeline will not leak during the operation such as pipeline hot work or maintenance, and provides safe and reliable protection for the oil and gas pipeline operation.

[0058] In summary, the oil and gas pipeline plug plugging sealing piece of the embodiment adopts the design of double level sealing and reinforcing ribs 22, so that it can form a close fit with the inner wall of the pipeline rapidly and stably during plugging, and ensure that the medium of the oil and gas pipeline does not leak, and provide reliable safety protection for the hot work operation of the pipeline. Through a series of efficient sealing functions, the sealing leakage problem of the traditional plugging skin bowl in the oil and gas pipeline plugging construction is solved, the problems that the cloth layer and the rubber part are easily torn when the high-pressure pipeline is operated, and the problem that the cloth layer and the rubber part are easily damaged during operation are solved. The application of the oil and gas pipeline plug plugging sealing piece provided in the embodiment in the oil and gas pipeline operation has important practical value.

[0059] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not the limitation of the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, readjustment and replacement can be carried out without departing from the protection scope of the utility model. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made in the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. An oil and gas pipeline plug-type block seal, characterized by, The oil and gas pipeline plug sealing device is matched with a plugging head to seal a pipeline, and the oil and gas pipeline plug sealing device comprises: A sealing structure (1) is provided with at least two first mounting holes which are distributed along the circumference of the sealing structure (1); A base (2) is coaxial with the sealing structure (1) and is vulcanized and bonded, the base (2) is provided with at least two second mounting holes (21), the number of the second mounting holes (21) is equal to that of the first mounting holes and one-to-one correspondence, the side of the base (2) away from the sealing structure (1) is a first surface, the side of the base (2) towards the sealing structure (1) is a second surface, the diameter of the first surface is smaller than the inner diameter of the pipeline, the second surface is provided with a reinforcing rib (22), the reinforcing rib (22) is distributed along the circumference of the base (2), and along the radial direction of the base (2), the reinforcing rib (22) is distributed on the side away from the hole wall of the second mounting hole (21); The sealing structure (1) comprises a cut-off sealing part (11) and a compression sealing part (12), the cut-off sealing part (11) is in a bowl shape, the side of the cut-off sealing part (11) towards the base (2) is provided with a reinforcing rib (22) accommodating groove, the reinforcing rib (22) is embedded in the reinforcing rib accommodating groove, and the inner wall of the compression sealing part (12) is fixedly connected with the outer wall of the cut-off sealing part (11).

2. The plug-type block seal for hydrocarbon pipelines of claim 1, wherein, The side of the first inclined surface (23) away from the reinforcing rib (22) extends in the direction away from the cut-off sealing part (11) along the axial direction of the base (2), the side of the cut-off sealing part (11) towards the base (2) is provided with a second inclined surface, one side of the second inclined surface is fixedly connected with the groove wall of the reinforcing rib accommodating groove, and the second inclined surface is in abutment with the first inclined surface (23).

3. The plug-type barrier seal for hydrocarbon pipelines of claim 2, wherein, The inclination angle of the side of the first inclined surface (23) away from the cut-off sealing part (11) is 20°-25° along the axial direction of the base (2).

4. The plug-type block seal for hydrocarbon pipelines of claim 1, wherein, The outer surface of the base (2) is provided as a third inclined surface (24), one side of the third inclined surface (24) is connected with the first surface, and the other side of the third inclined surface (24) extends away from the reinforcing rib (22) along the radial direction of the base (2). The fourth inclined surface (111) is fixedly connected to the other side of the third inclined surface (24) on one side, and extends away from the reinforcing rib (22) on the other side in the radial direction of the sealing structure (1), and the angle between the third inclined surface (24) and the fourth inclined surface (111) and the inner wall of the pipeline is 20°-30° in the axial direction of the sealing structure (1).

5. The plug-type block seal for hydrocarbon pipelines of claim 1, wherein, The diameters of the plurality of sealing rings (121) gradually increase in the axial direction of the pipeline and away from the base (2), and the largest diameter portion of the plurality of sealing rings (121) is connected to form a fifth inclined surface (122), and the angle between the fifth inclined surface (122) and the inner wall of the pipeline is 5°-10° in the axial direction of the sealing structure (1).

6. The plug-type block seal for hydrocarbon pipelines of claim 1, wherein, The sixth inclined surface (112) is further provided on the intercepting sealing part (11), and one side of the sixth inclined surface (112) is connected to the sealing ring (121) with the largest diameter in the plurality of sealing rings (121), and the other side of the sixth inclined surface (112) extends away from the reinforcing rib (22) in the radial direction of the sealing structure (1), and the angle between the sixth inclined surface (112) and the inner wall of the pipeline is 20°-25° in the axial direction of the sealing structure (1).

7. The plug-type block seal for hydrocarbon pipelines of claim 1, wherein, The intercepting sealing part (11) is provided with a cut surface (113) on the side away from the base (2) in the axial direction of the sealing structure (1), and the cut surface (113) is parallel to the first surface, and the width of the cut surface (113) is 3mm-8mm.

8. The plug-type block seal for hydrocarbon pipelines of claim 1, wherein, The reinforcing rib (22) is in the shape of a circular ring, the reinforcing rib receiving groove is an annular groove, and the reinforcing rib (22) and the reinforcing rib receiving groove are coaxial with the base (2).

9. The plug-type block seal for hydrocarbon pipelines of claim 1, wherein, The base (2) is a rubber and aramid cloth composite product, and the sealing structure (1) is a rubber product.

10. An oil and gas pipeline plug-type closure device, characterized by, The oil and gas pipeline plug sealing device comprises a plug head, a plug driving device and the oil and gas pipeline plug sealing device according to any one of claims 1-9, the plug head is connected with the oil and gas pipeline plug sealing device through bolts, and the plug driving device is used to send the plug head provided with the oil and gas pipeline plug sealing device to the inside of the pipeline.

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