CN-117189992-B - Flange pipeline plugging method

Abstract

The invention relates to the technical field of oil and gas pipeline maintenance, in particular to a flange pipeline plugging method which comprises the following steps of S1, clamping and arranging a cladding fixture at a pipeline leakage point, forming a gap space between the inner wall of the cladding fixture and the outer wall of a pipeline, S2, filling sealing filler in the gap space along the longitudinal direction of the pipeline, S3, respectively arranging pressing covers at two ends of the cladding fixture, wherein one end of each pressing cover stretches into the gap space and then is propped against the sealing filler, and the other end of each pressing cover is provided with a flange plate connected with the cladding fixture through an adjusting screw, and S4, propping and extruding the sealing filler through the pressing covers to seal the gap space. The sealing filler is tightly pressed and attached to the pipeline, the pressure bearing capacity is high, secondary leakage is not easy to generate, the blocking effect is good, and meanwhile, single-side pushing extrusion or double-side synchronous pushing extrusion can be adopted according to the leakage quantity of the leakage point, so that the gas quantity remained between two sections of sealing fillers is reduced as much as possible.

Inventors

• JING JINGYONG
• ZHAO HONGBO
• WANG LI
• LUO HAO
• LIU XUESHENG
• MI XIAO

Assignees

• 中国石油化工股份有限公司
• 中国石油化工股份有限公司西南油气分公司

Dates

Publication Date

20260508

Application Date

20220530

Claims (6)

1. 1. A flange pipeline plugging method is characterized in that a cladding fixture is adopted, the cladding fixture comprises a first packing box (41) and a second packing box (42) which are connected in a buckled mode, after the first packing box (41) and the second packing box (42) are connected in a buckled mode, a first packing bin (71), a first communication channel (72), a sealing bin (73), a second communication channel (74) and a second packing bin (75) which are communicated in sequence are formed in the cladding fixture along the axis direction, the inner diameter of the sealing bin (73) is larger than the outer diameter of a flange of a pipeline (1) where a leakage point is located, the inner diameter of a first filling bin (71) and the inner diameter of a second filling bin (75) are larger than the inner diameter of a first communication channel (72) and the inner diameter of a second communication channel (74), a step structure is formed between the first filling bin (71) and the first communication channel (72), between the second communication channel (74) and the second filling bin (75) respectively, a sealing groove (8) is formed on the buckling surface of the first filling box (41) and/or the second filling box (42), the sealing groove (8) is communicated with the first filling bin (71) and the second filling bin (75), a sealing rubber strip is embedded in the sealing groove (8), and the sealing groove (8) comprises a sealing groove (72), a sealing bin (73) and a sealing groove (8) along the first communication channel, the second communication channel (74) is provided with a communication section (81) and a bending section (82) arranged at two ends of the communication section (81), one end of the bending section (82) is communicated with the communication section (81), the other end is provided with a reducing section (83) radially communicated with the first filling bin (71) or the second filling bin (75), And comprises the following steps: The method comprises the steps of S1, clamping a cladding type clamp at a leakage point of a pipeline (1), wherein a flange plate of the pipeline (1) where the leakage point is located in a sealing bin (73) arranged in the middle area of the cladding type clamp, a clearance space (2) is formed between the inner wall of the cladding type clamp and the outer wall of the pipeline (1), a supporting rubber strip (6) is arranged on the pipeline (1) or at the edge position, corresponding to the axis direction of the sealing bin (73), of the cladding type clamp, and then the cladding type clamp is clamped on the pipeline (1), the supporting rubber strip is a hard rubber structural member with a cutting opening, and comprises an annular supporting rubber strip or a section-shaped supporting rubber strip; s2, filling sealing filler (3) in the clearance spaces (2) at two sides of the sealing bin (73) along the longitudinal direction of the pipeline (1); S3, respectively arranging pressing covers (5) at two ends of the cladding fixture, wherein one end of each pressing cover (5) stretches into the clearance space (2) and then is propped against the sealing filler (3), the other end of each pressing cover is provided with a flange plate and is connected with the cladding fixture through an adjusting screw (52), the pressing covers (5) comprise a plurality of pressing blocks (51), and each pressing block (51) is respectively connected with the adjusting screw (52); s4, respectively adjusting the adjusting screws (52) at two ends of the cladding fixture, pushing and extruding the sealing filler (3) to seal the clearance space (2) through the gland (5), adopting single-side pushing and extruding or double-side synchronous pushing and extruding according to the leakage quantity of the leakage point, and carrying out block-by-block pushing and adjusting on all the pressing blocks (51) according to the clockwise or anticlockwise sequence through the adjusting screws (52), so that the gas retained in the sealing filler moves from the filler region corresponding to the pressing block in the pushing and adjusting process to the filler region corresponding to the pressing block which is not pushed and adjusted.
2. 2. A method of plugging a flanged pipe according to claim 1, wherein in S1, the packing jig is clamped to the pipe (1) after filling a portion of the packing (3) on the step structure.
3. 3. A method for plugging a flanged pipe according to any one of claims 1-2, characterized in that the outer walls of the first packing box (41) and the second packing box (42) are respectively provided with a connecting flange (43) adapted to the gland (5), and in S3, the connecting flange (43) is connected with the gland (5) through the adjusting screw (52).
4. 4. A method for plugging a flanged pipe according to claim 1, wherein in S1, the cladding jig is clamped to the pipe (1) after the sealing strip is inserted into the sealing groove (8).
5. 5. The method for plugging a flange pipeline according to claim 1, wherein the coating clamp is provided with a grease injection hole (9) on the seal bin (73), the grease injection hole (9) is kept in an open state when S4 is performed, and after S4 is finished, S5 is performed, sealing grease is filled into the seal bin (73) through the grease injection hole (9) and the grease injection hole (9) is plugged.
6. 6. A method for plugging a flanged pipe according to claim 5, wherein S5 is performed by penetrating a drainage tube from the grease injection hole (9), taking out the drainage tube after the sealing grease injection volume exceeds three fourths of the design volume of the sealing bin (73), and injecting grease under pressure.

Description

Flange pipeline plugging method Technical Field The invention relates to the technical field of petroleum and natural gas pipeline maintenance, in particular to a flange pipeline plugging method. Background The conventional oil gas production and transportation are all independent of pipeline transportation, common oil gas pipelines are generally formed by butt joint combination of flanges of multiple pipe sections, the oil gas pipelines are in outdoor environment for a long time and are corroded by rainwater, dust and the like, the inside of the oil gas pipelines is influenced by impurities and acidic substances in oil gas, leakage points are easy to appear on the butt joint surfaces of the flanges, and maintenance treatment is needed. Because of the operational specificity of the oil gas pipeline, the normal transportation of oil gas is greatly affected by the maintenance plugging treatment after the oil gas pipeline is shut down, and because the oil gas in the pipeline is retained, oil gas leakage is easy to occur when the flange butt joint part is opened, so that resource waste and great potential safety hazard are caused, and therefore, the important point of research is how to perform the maintenance plugging treatment of the leakage point when the oil gas pipeline is in normal operation. The existing oil gas pipeline online plugging mode generally carries out integral coating on the leakage points, adopts sealing grease, sealing filler and the like to cover the leakage points, but in actual operation, the flange plate is larger in size, the sealing grease, the sealing filler and the like are manually attached to the leakage points and are not tightly contacted with the pipeline leakage points, the plugging process is also continuous in leakage, a large amount of leakage gas is reserved between the sealing filler and the pipeline, the plugging effect is poor, and the service life after plugging is short. Therefore, a technical scheme is needed at present to solve the technical problem that the maintenance plugging effect of the leakage point is poor when the existing oil and gas pipeline is operated. Disclosure of Invention The invention aims to provide a method for plugging a flange pipeline, which aims at solving the technical problem that the maintenance plugging effect of a leakage point is poor in the operation process of the existing oil and gas pipeline. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: A flange pipeline plugging method comprises the following steps of S1 clamping a pipeline leakage point to form a coating clamp, wherein a pipeline flange plate where the leakage point is located in a sealing bin of the coating clamp, a gap space is formed between the inner wall of the coating clamp and the outer wall of the pipeline, S2 filling sealing filler in the gap space at two sides of the sealing bin along the longitudinal direction of the pipeline, S3 respectively arranging pressing covers at two ends of the coating clamp, one end of each pressing cover stretches into the gap space and then is propped against the sealing filler, the other end of each pressing cover is connected with the coating clamp through an adjusting screw, and S4 respectively adjusting the adjusting screws at two ends of the coating clamp and propping against and extruding the sealing filler to seal the gap space through the pressing covers. According to the flange pipeline plugging method, the clamping-mounted cladding type clamp is adopted, and the gland is arranged to push and press the sealing filler filled in the clearance space, so that compared with the manual application of the sealing filler, the sealing filler is pressed tightly and tightly attached to the pipeline, the pressure bearing capacity is high, secondary leakage is not easy to occur, the plugging effect is good, and meanwhile, the sealing filler is pushed and pressed respectively from the two sides of the leakage point, so that the gas quantity remained between the two sections of sealing filler can be reduced as much as possible by adopting single-side pushing and pressing or double-side synchronous pushing and pressing according to the leakage quantity of the leakage point. In the preferred scheme of the invention, in S1, a supporting adhesive tape is arranged on a pipeline or at the edge position corresponding to a sealing bin in the cladding type clamp, and then the cladding type clamp is clamped on the pipeline. Make the support adhesive tape support and form clearance space between cladding formula anchor clamps and the pipeline, can adopt annular support adhesive tape according to actual conditions, avoid cladding formula anchor clamps to receive the influence of gravity and pipeline laminating, influence the hoop width homogeneity in clearance space that forms, make the flange pipeline periphery sealing effect after the shutoff unanimous, simultaneously, can adopt segmentation support adh