Leakage stopping device for oil and gas pipeline

Abstract

The invention discloses an oil and gas pipeline leakage stopping device which comprises a plugging sleeve, a sealing sleeve and a sealing sleeve. The sealing cushion block is installed on the inner wall face of the plugging sleeve, a sealing face is arranged on the inner side of the sealing cushion block, and a labyrinth sealing groove is formed in the sealing face; the sealing face can cover the leakage area of the oil and gas pipeline and is attached to the outer wall face of the oil and gas pipeline in a sealed mode, and fluid leaked out of the leakage area can flow into the labyrinth sealing groove. Fluid in an oil and gas pipeline flows into the labyrinth sealing groove when leaking outwards from a leakage area, and the pressure and the flow speed of the fluid are reduced through multiple times of direction change and energy dissipation in the labyrinth sealing groove, so that the fluid cannot break through the sealing performance between the sealing cushion block and the oil and gas pipeline, the leakage stopping reliability is guaranteed, and the leakage stopping effect is improved. And the leakage stopping device is easy to operate and can be suitable for leakage stopping of high-pressure oil and gas pipelines with high internal pressure.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas pipeline leak stoppage, and in particular, to an oil and gas pipeline leak stoppage device. Background Art

[0002] Natural gas is not only an important clean energy source but also an important chemical raw material, belonging to flammable and explosive chemicals. Natural gas is transported by pipelines. Once a leakage accident occurs, it is extremely likely to cause catastrophic consequences. However, due to pipeline corrosion, construction, geological disasters, and human factors, leakage accidents of oil and gas pipelines occur frequently. In order to maintain the stability and reliability of the pipeline system and ensure safety, it is necessary to carry out emergency repair work on the pipeline in a timely manner.

[0003] In actual repair operations, leak stoppage is the prerequisite for carrying out repair work. Only by stopping the leakage first can a safe and stable environment be created for repair measures such as replacing pipeline components and welding. Leak points often have the characteristics of a large number and uneven distribution. If the leakage continues, it will interfere with the accuracy of detection equipment and increase the difficulty of locating leakage points. Stopping the leakage of leak points in a timely manner can not only improve the positioning accuracy of detection equipment for other leak points but also give repair personnel more time for evaluation and planning.

[0004] In the prior art, the following rapid plugging methods are mainly used for the emergency repair and plugging of oil and gas pipelines:

[0005] I. Low-pressure pipeline rapid blocking device: By means of hydraulic extrusion, a steel oil and gas pipeline below medium pressure (generally below 6.4 MPa) is extruded radially until it is closed to achieve rapid plugging; the low-pressure pipeline rapid blocking device is highly portable and does not require opening and venting of the pipeline during the plugging process, so it can quickly block air leakage and seize the opportunity to carry out repairs when conditions are met; however, through the actual application at the operation site, this device has certain limitations in use: after the pipeline is extruded and deformed, the pipeline wall thickness will become thinner. From a safety perspective, operators need to weld a "protective sleeve" on the deformed pipeline, thus increasing the welding amount, and this method cannot be applied to the leak stoppage of oil and gas pipelines under high-pressure conditions.

[0006] II. Expansion cylinder type plugging: A four-way pipe fitting is welded on the construction pipeline, a clamping valve is installed, a through-type equal-diameter opening is made, and an expansion cylinder with a rubber layer on its surface that can radially contract and expand is installed in the broken pipe. During plugging, the expansion cylinder expands, and the rubber layer closely fits the pipeline cut surface to achieve plugging; when the plugging is completed, the expansion cylinder contracts, and the plugging device can be lifted and retracted; its disadvantage is that the expansion cylinder plugging process faces the opening of the expansion cylinder towards the gas flow direction, and it is necessary to wait until the downstream gas is completely vented before it can be judged whether the plugging is successful, and the waiting time for venting is relatively long.

[0007] III. Traditional plugging with a plug: A tee fitting is welded onto the construction pipeline, a clamping valve is installed, a single-sided hole is drilled, and a piston head with a rubber cup on its surface and capable of turning is installed in the pipeline. During plugging, the rubber cup fits tightly against the inner wall of the pipeline to achieve plugging. When the plugging is completed, the piston head can be lifted and retracted. However, the plugging effect of the plug on a deformed pipeline is poor and gas leakage is likely to occur. In addition, since the plugging relies on the interference fit between the plugging rubber cup and the inner wall of the pipeline, the plugging rubber cup is not suitable for repeated use, increasing the cost of repairing and replacing the rubber cup. Summary of the Invention

[0008] The object of the present invention is to provide an oil and gas pipeline leak stopping device to solve the technical problems that the applicable range of the existing rapid plugging method is limited and the operation is complex.

[0009] The above object of the present invention can be achieved by the following technical solutions:

[0010] The present invention provides an oil and gas pipeline leak stopping device, including: a plugging sleeve for sleeving on the oil and gas pipeline; a sealing cushion block installed on the inner wall surface of the plugging sleeve, the inner side of the sealing cushion block having a sealing surface, and a labyrinth sealing groove being opened on the sealing surface; wherein, the sealing surface can cover the leakage area of the oil and gas pipeline and be sealingly attached to the outer wall surface of the oil and gas pipeline, and the fluid leaking out from the leakage area can flow into the labyrinth sealing groove.

[0011] In an embodiment of the present invention, the sealing surface is further provided with a matching annular sealing groove and a sealing ring, the sealing ring is installed in the annular sealing groove, and the labyrinth sealing groove is located within the enclosed area of the annular sealing groove.

[0012] In an embodiment of the present invention, the labyrinth sealing groove includes a plurality of transverse channels and a plurality of longitudinal channels, and the plurality of transverse channels and the plurality of longitudinal channels are arranged in a cross pattern within the enclosed area of the annular sealing groove and are connected to the annular sealing groove.

[0013] In an embodiment of the present invention, the plugging sleeve is provided with a plurality of fastening bolt holes and a plurality of pressing members, the plurality of fastening bolt holes are threadedly connected to the plurality of pressing members, and one end of the plurality of pressing members abuts against the outer side surface of the sealing cushion block.

[0014] In an embodiment of the present invention, the plurality of pressing members are arranged in an array along the length direction and the width direction of the sealing cushion block.

[0015] In an embodiment of the present invention, the sealing surface is an arc surface matching the outer wall surface of the oil and gas pipeline.

[0016] In an embodiment of the present invention, the inner wall surface of the plugging sleeve is provided with an installation groove for installing the sealing cushion block.

[0017] In an embodiment of the present invention, the plugging cuff includes two semi-circular cuffs, the two semi-circular cuffs are symmetrically arranged on both sides of the oil and gas pipeline, and both ends of the two semi-circular cuffs are detachably connected through a connecting structure. The sealing cushion block is installed on the inner wall surface of one of the semi-circular cuffs and is located in the middle of the semi-circular cuff.

[0018] In an embodiment of the present invention, the connecting structure includes a plurality of connecting bolts and a plurality of connecting nuts. Ear plates are provided at both ends of the two semi-circular cuffs, and a plurality of corresponding connecting bolt holes are provided on the ear plates of the two semi-circular cuffs. One end of the plurality of connecting bolts passes through the plurality of connecting bolt holes and is connected to the plurality of connecting nuts.

[0019] In an embodiment of the present invention, the oil and gas pipeline leak stoppage device further includes at least one leakage detection sensor, and the leakage detection sensor is installed on the plugging cuff and / or the sealing cushion block; the leakage detection sensor is an acoustic wave sensor.

[0020] The characteristics and advantages of the present invention are:

[0021] For the oil and gas pipeline leak stoppage device of the present invention, by installing a sealing cushion block on the inner wall surface of the plugging cuff and arranging a labyrinth seal groove on the sealing surface of the sealing cushion block, the sealing surface of the sealing cushion block is used to cover the leakage area of the oil and gas pipeline and is hermetically attached to the outer wall surface of the oil and gas pipeline. When the fluid in the oil and gas pipeline leaks out from the leakage area, it will flow into the labyrinth seal groove and change directions and dissipate energy multiple times in the labyrinth seal groove, making the flow velocity of the fluid change continuously and causing the fluid to break flow and friction, so that the kinetic energy of the fluid is gradually converted into heat energy, reducing the pressure and flow velocity of the fluid, making the fluid unable to break through the sealing performance between the sealing cushion block and the oil and gas pipeline, thus ensuring the reliability of leak stoppage, and the operation is simple, and it can be applied to the leak stoppage of high-pressure oil and gas pipelines with higher internal pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic structural diagram of the oil and gas pipeline leak stoppage device of the present invention.

[0024] Figure 2 It is a schematic structural diagram of the sealing cushion block of the present invention.

[0025] In the figure:

[0026] 1. Plugging sleeve; 11. Upper half-ring sleeve; 12. Lower half-ring sleeve; 13. Installation groove; 14. Ear plate; 15. Connection structure; 151. Connection bolt; 152. Washer; 153. Connection nut; 2. Sealing pad; 21. Sealing surface; 22. Labyrinth sealing groove; 221. Transverse channel; 222. Longitudinal channel; 23. Annular sealing groove; 3. Compressing member; 4. Acoustic wave sensor; 5. Oil and gas pipeline. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0028] As Figure 1 and Figure 2 shown, the present invention provides an oil and gas pipeline leak stoppage device, including: a plugging sleeve 1 for sleeving on the oil and gas pipeline 5; a sealing pad 2 installed on the inner wall surface of the plugging sleeve 1, and the inner side of the sealing pad 2 has a sealing surface 21, and a labyrinth sealing groove 22 is opened on the sealing surface 21; wherein, the sealing surface 21 can cover the leakage area of the oil and gas pipeline 5 and be hermetically attached to the outer wall surface of the oil and gas pipeline 5, and the fluid leaking out of the leakage area can flow into the labyrinth sealing groove 22.

[0029] For the oil and gas pipeline leak stoppage device of the present invention, by installing the sealing pad 2 on the inner wall surface of the plugging sleeve 1 and arranging the labyrinth sealing groove 22 on the sealing surface 21 of the sealing pad 2, the sealing surface 21 of the sealing pad 2 is used to cover the leakage area of the oil and gas pipeline 5 and be hermetically attached to the outer wall surface of the oil and gas pipeline 5. When the fluid in the oil and gas pipeline 5 leaks outwards from the leakage area, it will flow into the labyrinth sealing groove 22 and change directions and dissipate energy multiple times in the labyrinth sealing groove 22, so that the flow velocity of the fluid changes continuously and generates flow interruption and friction, making the kinetic energy of the fluid gradually converted into heat energy, reducing the pressure and flow velocity of the fluid, so that the fluid cannot break through the sealing between the sealing pad 2 and the oil and gas pipeline 5, thereby ensuring the reliability of leak stoppage, and the operation is simple, and it can be applicable to the leak stoppage of high-pressure oil and gas pipelines 5 with a relatively high internal pressure (such as 10 MPa).

[0030] In addition, as Figure 2As shown, the labyrinth seal groove 22 has multiple narrow portions and multiple widened portions. The flow channel width of the narrow portions is smaller than that of the widened portions, so that throttling effect can be generated when the fluid flows along the labyrinth seal groove 22 of the seal pad 2. According to Bernoulli's equation, the increase in the fluid velocity is accompanied by the decrease in pressure. Therefore, when the fluid flows in the labyrinth seal groove 22, the fluid velocity increases when flowing through the narrow portions of the labyrinth seal groove 22, and the pressure decreases accordingly. When flowing through the widened portions, the velocity decreases and the pressure rises somewhat. This change in pressure makes the fluid always in a dynamic equilibrium state in the whole labyrinth seal groove 22 and difficult to break through the seal.

[0031] Specifically, as Figure 2 shown, the labyrinth seal groove 22 is generally in a zigzag channel structure, so that the fluid can change directions multiple times when flowing in the labyrinth seal groove 22. To ensure that the sealing surface 21 fits more closely with the outer wall surface of the oil and gas pipeline 5, the sealing surface 21 is preferably an arc surface matching the outer wall surface of the oil and gas pipeline 5. Among them, the diameter range of the sealing surface 21 of the seal pad 2 is 219 mm to 1219 mm, which can match the oil and gas pipeline 5 with an outer diameter range of 219 mm to 1219 mm, and the maximum sealing pressure of the seal pad 2 can reach 12 MPa.

[0032] In addition, in order to improve the sealing performance between the sealing surface 21 of the seal pad 2 and the oil and gas pipeline 5, a matching annular seal groove 23 and a sealing ring are also provided on the sealing surface 21 of the seal pad 2. The sealing ring is installed in the annular seal groove 23, and the labyrinth seal groove 22 is located in the enclosed area of the annular seal groove 23; among them, the sealing ring is generally a ring-shaped structure made of a sealing elastic material, and the sealing elastic material includes but is not limited to rubber, polytetrafluoroethylene, polyester, etc.

[0033] In order to further improve the sealing performance of the labyrinth seal groove 22, as Figure 2 shown, in the embodiment of the present invention, the labyrinth seal groove 22 includes a plurality of transverse channels 221 and a plurality of longitudinal channels 222. The plurality of transverse channels 221 and the plurality of longitudinal channels 222 are arranged in a cross pattern in the enclosed area of the annular seal groove 23 and are connected to the annular seal groove 23. Among them, the plurality of transverse channels 221 and the plurality of longitudinal channels 222 are arranged in a cross pattern to form a grid-like channel structure; the transverse channels 221 generally extend along the width direction of the seal pad 2, and the longitudinal channels 222 generally extend along the length direction of the seal pad 2. Among them, the width direction of the seal pad 2 is generally the circumferential direction of the oil and gas pipeline 5, and the length direction of the seal pad 2 is generally the axial direction of the oil and gas pipeline 5.

[0034] Combined with Figure 1 and Figure 2As shown, the sealing cushion block 2 is hermetically attached to the outer wall surface of the oil and gas pipeline 5 under the extrusion between the sealing sleeve 1 and the oil and gas pipeline 5. However, in order to make each area of the sealing surface 21 of the sealing cushion block 2 fit more closely to the outer wall surface of the oil and gas pipeline 5, and the sealing ring can also fit more closely to the outer wall surface of the oil and gas pipeline 5. In the embodiment of the present invention, the sealing sleeve 1 is provided with a plurality of fastening bolt holes and a plurality of pressing members 3. The plurality of fastening bolt holes are threadedly connected to the plurality of pressing members 3, and one end of the plurality of pressing members 3 abuts against the outer side surface of the sealing cushion block 2. During installation, by rotating each pressing member 3 towards the sealing cushion block 2, the axial force is converted into the frictional force between the threads of the pressing member 3 and the fastening threaded hole, thereby generating a pre-tightening force to exert a tightening pressure on the sealing cushion block 2, so as to press and fit the sealing surface 21 of the sealing cushion block 2 and the sealing ring onto the outer wall surface of the oil and gas pipeline 5, preventing relative movement or separation of the leakage areas between the sealing cushion block 2 and the oil and gas pipeline 5, and ensuring the stability and reliability of the seal.

[0035] Specifically, the contact pressure between the sealing ring and the outer wall surface of the oil and gas pipeline 5 can be expressed by the relational expression P = F / A, where P is the contact pressure, F is the fastening force applied by rotating the pressing member 3, and A is the contact area between the sealing ring and the outer wall surface of the oil and gas pipeline 5. The plurality of pressing members 3 are arranged in an array along the length direction and the width direction of the sealing cushion block 2. The number and arrangement spacing of the pressing members 3 can be set according to the size of the sealing cushion block 2. For example, in this embodiment, the number of the pressing members 3 is sixteen, and they are evenly arranged in a square array. The pressing members 3 can be pins or other fasteners in the prior art.

[0036] As Figure 1 shown, in order to facilitate the installation of the sealing cushion block 2 and improve the installation stability of the sealing cushion block 2, in the embodiment of the present invention, the inner wall surface of the sealing sleeve 1 is provided with an installation groove 13 for installing the sealing cushion block 2.

[0037] As Figure 1 shown, in order to facilitate the installation of the sealing sleeve 1 and make the forces between the sealing sleeve 1 and the oil and gas pipeline 5 and between the sealing cushion block 2 and the oil and gas pipeline 5 uniform, which is beneficial to improving the sealing performance between the sealing cushion block 2 and the oil and gas pipeline 5. In the embodiment of the present invention, the sealing sleeve 1 includes two semi-ring sleeves (respectively defined as the upper semi-ring sleeve 11 and the lower semi-ring sleeve 12). The upper semi-ring sleeve 11 and the lower semi-ring sleeve 12 are symmetrically arranged on both sides of the oil and gas pipeline 5, and both ends of the upper semi-ring sleeve 11 and the lower semi-ring sleeve 12 are detachably connected through a connecting structure 15. The sealing cushion block 2 is installed on the inner wall surface of one of the semi-ring sleeves (such as the upper semi-ring sleeve 11) and is located in the middle of the semi-ring sleeve.

[0038] Specifically, the connection structure 15 includes a plurality of connection bolts 151 and a plurality of connection nuts 153. Ear plates 14 are provided at both ends of the upper half-ring cuff 11 and the lower half-ring cuff 12. A plurality of corresponding connection bolt holes are provided on the ear plates 14 of the upper half-ring cuff 11 and the lower half-ring cuff 12. One end of the plurality of connection bolts 151 passes through the plurality of connection threaded holes and is connected to the plurality of connection threads. In addition, at least one washer 152 is sleeved on the connection bolt 151, and the washer 152 is clamped between the head of the connection bolt 151 and the ear plate 14 and / or clamped between the connection nut 153 and the ear plate 14.

[0039] During installation, first connect the two ends of the upper half-ring cuff 11 and the lower half-ring cuff 12 into a sealing cuff 1 through the connection bolts 151 but do not tighten them, so that there is a gap between the sealing cuff 1 and the oil and gas pipeline 5 and the sealing cuff 1 can be rotated to drive the sealing pad 2 to move to the leakage area of the oil and gas pipeline 5. Then tighten the connection bolts 151 to fix the sealing cuff 1, and then tighten a plurality of pressing members 3 to make the sealing surface 21 of the sealing pad 2 fit tightly with the outer wall surface of the oil and gas pipeline 5.

[0040] As Figure 1 shown, in the embodiment of the present invention, the oil and gas pipeline leak stoppage device further includes at least one leakage detection sensor, and the leakage detection sensor is installed on the sealing cuff 1 and / or the sealing pad 2. The leakage detection sensor is used to detect in real time whether the fluid leaking from the leakage area leaks through the gap between the sealing pad 2 and the oil and gas pipeline 5. Specifically, the leakage detection sensor is an acoustic sensor, which is used to collect the acoustic signal excited by the vibration caused by the leakage flow, and thus can realize leakage detection based on the acoustic signal. Among them, the acoustic sensor can be a sound wave sensor 4, and the acoustic signal collected by the sound wave sensor 4 is a sound wave signal. When the fluid leaks through the gap between the sealing pad 2 and the oil and gas pipeline 5, sound waves with specific frequencies, wavelengths and energies will be generated instantaneously. With its highly sensitive sensing ability, the sound wave sensor 4 can capture these sound wave signals caused by the leakage. Subsequently, the sound wave signal will be converted into an electrical signal that changes with time. During the transmission process, the electrical signal will be affected by noise and interference, and methods such as amplitude modulation, frequency modulation or phase modulation can be used to reduce the influence of these adverse factors. Among them, the sound wave sensor 4 is preferably installed on the inner wall surface of the sealing cuff 1, inside the wall body of the sealing cuff 1, on the outer side surface of the sealing pad 2 or inside the wall body of the sealing pad 2, so that the sound wave sensor 4 can be closer to the sealing surface 21 of the sealing pad 2, which is beneficial to more sensitively sense the sound wave change between the sealing surface 21 and the outer wall surface of the oil and gas pipeline 5. Of course, the sound wave sensor 4 can also be embedded on the outer wall surface of the sealing cuff 1 as in this embodiment, which is convenient for disassembly and assembly and for transmitting the collected sound wave signal to the receiving end of the sound wave sensor 4.

[0041] In addition, the number of the acoustic wave sensors 4 is preferably set to be plural. According to the differences of the acoustic wave signals obtained by different acoustic wave sensors 4, the leakage position can be analyzed more accurately. Furthermore, the pressing forces of the pressing members 3 at different positions can be adjusted according to the leakage position, so as to adjust the sealing performance between the sealing gasket 2 and the oil and gas pipeline 5.

[0042] The propagation of the acoustic wave signal in the oil and gas pipeline 5 follows certain physical laws. The relationship between its propagation speed v and the elastic modulus E and density ρ of the material of the oil and gas pipeline 5 can be expressed by the formula where the elastic modulus E reflects the ability of the material of the oil and gas pipeline 5 to resist deformation, and the density ρ reflects the mass distribution characteristics of the material of the oil and gas pipeline 5. The transmitted acoustic wave signal will be received by the receiving end of the acoustic wave sensor 4 and subjected to processing such as demodulation, filtering, and amplification to restore the characteristics of the original acoustic wave signal, and then subsequent analysis and judgment are carried out to determine the characteristics such as the frequency components and amplitudes in the frequency spectrum, the leakage position, leakage amount, and leakage type of the oil and gas pipeline 5, so as to judge whether there is leakage in the oil and gas pipeline 5 and the specific situation of the leakage.

[0043] Among them, the receiving end of the acoustic wave sensor 4 selects a suitable threshold through wavelet transform for the acoustic wave signal transmitted by the acoustic wave sensor 4. The wavelet coefficients greater than the threshold are considered to be generated by effective acoustic wave signals and should be retained, while the wavelet coefficients less than the threshold are considered to be generated by noise and are set to zero, so as to reduce the noise of the acoustic wave signal. After reducing the noise of the acoustic wave signal, the time-domain diagram of the acoustic wave signal is obtained, and a series of time-domain eigenvalue of the acoustic wave signal are continuously extracted. By extracting the time-domain eigenvalue of the acoustic wave signal as the training set of the support vector machine, the leakage of the acoustic wave signal is identified through the support vector machine. The more specific processing, analysis, and judgment involved in the leakage identification based on the acoustic wave signal by the receiving end of the acoustic wave sensor 4 are the same as those in the prior art and will not be elaborated here.

[0044] The above are only several embodiments of the present invention. Those skilled in the art can make various changes or modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention based on the content disclosed in the application documents.

Claims

1. An oil and gas pipeline leak-proof device, characterized in that: include: The plugging sleeve is used to be installed on the oil and gas pipeline; A sealing gasket block is installed on the inner wall surface of the blocking sleeve, the inner side of the sealing gasket block has a sealing surface, and the sealing surface is provided with a labyrinth sealing groove; The sealing surface can cover the leakage area of ​​the oil and gas pipeline and seal with the outer wall surface of the oil and gas pipeline, and the fluid leaking from the leakage area can flow into the labyrinth sealing groove.

2. The oil and gas pipeline leakage-stopping device according to claim 1, characterized in that: The sealing surface is also provided with a matching annular sealing groove and a sealing ring, the sealing ring is installed in the annular sealing groove, and the labyrinth sealing groove is located in the enclosed area of ​​the annular sealing groove.

3. The oil and gas pipeline leakage-stopping device according to claim 2, characterized in that: The labyrinth sealing groove includes a plurality of transverse grooves and a plurality of longitudinal grooves, and the plurality of transverse grooves and the plurality of longitudinal grooves are cross-arranged in the enclosed area of ​​the annular sealing groove and are in communication with the annular sealing groove.

4. The oil and gas pipeline leakage-stopping device according to claim 2, characterized in that: The sealing sleeve is provided with a plurality of fastening bolt holes and a plurality of clamping pieces, the plurality of fastening bolt holes are threadedly connected with the plurality of clamping pieces, and one end of the plurality of clamping pieces abuts against the outer side surface of the sealing gasket block.

5. The oil and gas pipeline leakage-stopping device according to claim 4, characterized in that: The plurality of pressing members are arranged in an array along the length direction and the width direction of the sealing gasket block.

6. The oil and gas pipeline leakage-stopping device according to claim 1, characterized in that: The sealing surface is an arc surface matching the outer wall surface of the oil and gas pipeline.

7. The oil and gas pipeline leakage-stopping device according to claim 1, characterized in that: The inner wall surface of the blocking sleeve is provided with a mounting groove for mounting the sealing gasket block.

8. The oil and gas pipeline leakage-stopping device according to claim 1, characterized in that: The blocking sleeve includes two half-ring sleeves, which are symmetrically arranged on both sides of the oil and gas pipeline, and both ends of the two half-ring sleeves are detachably connected through a connecting structure. The sealing gasket is installed on the inner wall surface of one of the half-ring sleeves and is located in the middle of the half-ring sleeve.

9. The oil and gas pipeline leakage-stopping device according to claim 8, characterized in that: The connection structure includes multiple connecting bolts and multiple connecting nuts. Ear plates are provided at both ends of the two semi-ring sleeves. The ear plates of the two semi-ring sleeves are provided with multiple corresponding connecting bolt holes. One end of the multiple connecting bolts passes through the multiple connecting bolt holes and is connected to the multiple connecting nuts.

10. The oil and gas pipeline leakage-stopping device according to claim 1, characterized in that: The oil and gas pipeline leakage prevention device also includes at least one leakage detection sensor, which is installed on the sealing sleeve and / or the sealing gasket; the leakage detection sensor is an acoustic wave sensor.

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