Pressure tapping and plugging device for oil and gas pipeline

Abstract

An oil and gas pipeline pressure tapping plugging device comprises a plugging device A, a clamping plate valve A, an auxiliary hole pipe fitting, an oil cylinder, a clamping plate valve A, an oil pumping pipe fitting, a flange, a clamping plate valve B, a plugging device B and a mechanical intelligent plugging device, the flange, the clamping plate valve B and the plugging device B are welded to the cut-off position of a defective pipe section, and a piston rod of the oil cylinder is connected with the mechanical intelligent plugging device. A main shaft of the plugging device A is movably connected with a main shaft of a speed reducing mechanism of the mechanical intelligent plugging device, and anchoring and plugging operation of the mechanical intelligent plugging device is completed by rotating the main shaft of the plugging device A. By means of the device, single-sealing and double-sealing construction of the oil and gas pipeline can be completed, only two auxiliary hole pipe fittings are reserved on the two sides of the maintained pipeline after construction is completed, and high danger and leakage risks caused by the fact that the number of the pipe fittings is large are effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas pipeline maintenance tools, and particularly relates to a pressure - tapping and plugging device for oil and gas pipelines under pressure. Background Technique

[0002] During the use of oil and gas transportation pipelines, due to their own or external factors, local corrosion, deformation or damage may occur in the pipelines, posing potential safety hazards to the pipelines. When repairing or replacing the defective sections, pipeline plugging operations are required. As shown in the attached Figure 1 figure, the traditional pressure - tapping and plugging device for oil and gas pipelines: corresponding process hole fittings 3, plugging tee fittings 6 and oil extraction fittings 8 are welded at both ends of the defective pipe section according to the pipe diameter specifications. A high - pressure hole - opening machine is used to open holes on the corresponding fittings. The disc - type plugging head 7 is sent into the pipeline by the oil cylinder 4 for plugging operations. After the plugging is completed and the tightness is tested, and there is no leakage, the medium in the defective pipe section is discharged through the oil extraction fitting 8, and the defective pipe section is cut off and removed by a cold cutting device. The traditional pressure - tapping and plugging device for oil and gas pipelines requires a large number of plugging tee fittings, airbag fittings and bypass fittings to be welded on the pipeline, which cannot be removed. Therefore, there are problems such as high danger and large leakage risk. Content of the Utility Model

[0003] The utility model provides a pressure - tapping and plugging device for oil and gas pipelines under pressure to solve the problems existing in the prior art, such as a large number of welded parts that cannot be removed and a large leakage risk.

[0004] The technical solution adopted by the utility model to solve its technical problems is as follows:

[0005] A pressure - tapping and plugging device for oil and gas pipelines under pressure includes a plugging device A, a clamping valve A, a process hole fitting, an oil cylinder, a clamping valve A, an oil extraction fitting, a flange, a clamping valve B, a plugging device B and a mechanical intelligent plugging device. The flange, the clamping valve B and the plugging device B are welded at the truncated position of the defective pipe section. The piston rod of the oil cylinder is connected to the mechanical intelligent plugging device. The main shaft of the plugging device A is movably connected to the main shaft of the reduction mechanism of the mechanical intelligent plugging device. The anchoring and plugging operations of the mechanical intelligent plugging device are completed by rotating the main shaft of the plugging device A. The mechanical intelligent plugging device includes an anchoring and plugging unit and a pipe - cleaning unit. The anchoring and plugging unit and the pipe - cleaning unit are connected by a universal joint. The anchoring and plugging unit includes two rolling wheel mechanisms, a plugging mechanism, an anchoring mechanism and a reduction gear. The anchoring mechanism is composed of a plurality of anchoring jaws, and the anchoring jaws are evenly distributed around the central axis of the anchoring and plugging unit. The plugging mechanism is composed of a pressing disc, a rubber cup, a movable cone, a T - shaped slider, a fixed disc and a lead screw. The front end and the rear end of the pipe - cleaning unit are respectively provided with a cup assembly and a collision - proof head, and a positioning and tracking device is installed inside the pipe - cleaning unit.

[0006] When the device of the present utility model is in use, first perform plugging operations on both sides and empty the medium in the pipeline section to be plugged. Use a cold cutting device to cut off and remove the defective pipe section. Weld flanges at the pipe ends of the cutting position, install a clamping valve and a plugging device. Lift the traditional disc-shaped plugging head of the oil cylinder, send the mechanical intelligent plugging device to the designated position in the pipeline, connect the main shaft of the plugging device to the main shaft of the deceleration mechanism of the mechanical intelligent plugging device, and complete the anchoring and plugging operations of the mechanical intelligent plugging device by rotating the main shaft of the plugging device. Disconnect the mechanical intelligent plugging device from the main shaft of the plugging device, remove the clamping valve and the plugging device. Cut the pipe at the designated position on the pipeline, weld the prefabricated new pipeline to the pipeline. Release the plugging and anchoring of the mechanical intelligent plugging device, push the mechanical intelligent plugging device into the downstream receiving and launching barrel under the action of pressure and take it out, plug the two process hole pipe fittings and install blind plates.

[0007] The device of the present utility model can complete single-sealing and double-sealing construction of oil and gas pipelines. After the construction is completed, only two process hole pipe fittings are left on both sides of the repaired pipeline, effectively reducing the high risk and leakage risk due to the presence of many pipe fittings. Brief Description of the Drawings

[0008] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0009] Figure 1 is a schematic structural diagram of a traditional pressure tapping and plugging device for oil and gas pipelines;

[0010] Figure 2 is a schematic structural diagram of the pressure tapping and plugging device for oil and gas pipelines of the present utility model;

[0011] Figure 3 is a schematic diagram of the use of the pressure tapping and plugging device of the present utility model Figure 2 ;

[0012] Figure 4 is a schematic diagram of the use of the pressure tapping and plugging device of the present utility model Figure 3 ;

[0013] Figure 5 is a schematic diagram of the state after the completion of the pressure tapping and plugging process for oil and gas pipelines of the present utility model;

[0014] Figure 6 is a schematic structural diagram of the mechanical intelligent plugging device of the present utility model.

[0015] In the figure, there are plugging device A (1), clamping plate valve A (2), process hole pipe fitting (3), oil cylinder (4), clamping plate valve A (5), plugging pipe fitting (6), disc plugging head (7), oil pumping pipe fitting (8), flange (9), clamping plate valve B (10), plugging device B (11), mechanical intelligent plugging device (12), anchoring plugging unit (100), pressing disc (101), rubber cup (102), spacer ring (103), rubber cup (104), movable cone (105), anchoring slip (106), T-shaped slider (107), fixed disc (108), rolling wheel (109), rolling wheel bracket (110), rolling wheel fixed disc (111), lead screw (112), shear pin (113), limit block (114), speed reducer (115), protective shell (116), pigging unit (200), cup assembly (201), positioning and tracking device (202), anti-collision head (203), universal joint (300). Detailed implementation manners

[0016] Such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown in the figure, a pressure - opening and plugging device for oil and gas pipelines includes a plugging device A1, a clamping plate valve A2, a process hole pipe fitting 3, an oil cylinder 4, a clamping plate valve A5, an oil extraction pipe fitting 8, a flange 9, a clamping plate valve B10, a plugging device B11, and a mechanical intelligent plugging device 12. The flange 9, the clamping plate valve B10, and the plugging device B11 are welded at the cut - off position of the defective pipe section. The piston rod of the oil cylinder 4 is connected to the mechanical intelligent plugging device 12. The main shaft of the plugging device A1 is movably connected to the main shaft of the reducer 115 of the mechanical intelligent plugging device 12. The anchoring and plugging operations of the mechanical intelligent plugging device are completed by rotating the main shaft of the plugging device A1. The mechanical intelligent plugging device 12 includes an anchoring and plugging unit 100 and a pigging unit 200. The anchoring and plugging unit 100 and the pigging unit 200 are connected by a universal joint 300. The anchoring and plugging unit 100 includes two rolling wheel mechanisms, a plugging mechanism, an anchoring mechanism, and a reducer 115. The two rolling wheel mechanisms are respectively fixed at the front and rear ends of the anchoring and plugging unit. Each rolling wheel mechanism consists of a number of rolling wheels 109, a rolling wheel fixing plate 111, and a rolling wheel support 110. The anchoring mechanism consists of a plurality of anchoring slips 106. The anchoring slips 106 are evenly distributed around the central axis of the anchoring and plugging unit 100. The outer surface of the anchoring slip has a serrated structure. The plugging mechanism consists of a pressing disc 101, a rubber cup 102, a rubber cup 104, a movable cone 105, a T - shaped slider 107, a fixing plate 108, and a lead screw 112. One end of the lead screw 112 is connected to the pressing disc 101. The thread of the lead screw 112 has a right - hand helix. The other end of the lead screw 112 is connected to the output shaft of the reducer 115. One end of the T - shaped slider 107 is fixed on the fixing plate 108. The other end of the T - shaped slider 107 is slidably connected to the T - shaped groove on the anchoring slip 106. The tapered surface of the movable cone 105 is provided with a T - shaped guide rail. The anchoring slip 106 and the movable cone 105 are slidably connected through the T - shaped guide rail. A limit block 114 is provided at the front end of the movable cone 105. The limit block 114 is fixed on the pressing disc 101. A shear pin 113 is provided between the movable cone 105 and the pressing disc 101. Rubber cups 102 and 104 are provided on the front side of the movable cone. A spacer ring 103 is provided between the rubber cups 102 and 104. The front and rear ends of the pigging unit 200 are respectively provided with a cup assembly 201 and a collision - proof head 203. A positioning and tracking device 202 is installed inside the pigging unit. The rolling wheels 109 of the rolling wheel mechanism are evenly distributed around the rolling wheel fixing plate 111 through the rolling wheel support 110. The protective shell 116 of the reducer 115 is connected to the fixing plate 108 of the plugging mechanism.

[0017] When the device of the utility model is in use, first, a flange 9 is welded to the pipe end at the truncation position, a clamping plate valve B10 and a plugging device B11 are installed, and the tightness of the equipment is tested. The disc-type plugging head 7 is lifted and retracted into the plugging adapter by using an oil cylinder, and the mechanical intelligent plugging device 12 is sent to the designated position in the pipeline, so that the connecting shaft of the speed reduction mechanism in the mechanical intelligent plugging device 12 corresponds to the process hole on the process pipe fitting 3. The main shaft of the plugging device 1 is connected to the connecting shaft of the speed reduction mechanism on the mechanical intelligent plugging device 12. The main shaft of the special plugging device 1 can also play a limiting role, so that the position of the mechanical intelligent plugging device 12 remains unchanged under the action of pressure before or after anchoring. The mechanical intelligent plugging device 12 is provided with a slip and rubber cup. The anchoring and plugging operations of the mechanical intelligent plugging device are completed by rotating the main shaft of the plugging device 1, and the tightness is tested after plugging. The mechanical intelligent plugging device 12 is decoupled from the main shaft of the plugging device 11, and the equipment such as the oil cylinder 4, the clamping plate valve 5, the plugging device 11 and the clamping plate valve 10 are removed in sequence, and the pipe is cut at the designated position on the pipeline. The flange integrally welded to the plugging tee pipe fitting and the pipe end is cut and removed, and the prefabricated new pipeline is welded to the pipeline. After welding, the mechanical intelligent plugging device is released from plugging and the slip anchoring by using the special plugging device. The main shaft of the plugging device is lifted in sequence to release the limit, and the mechanical intelligent plugging device is pushed to the downstream receiving and sending barrel under the action of pressure and taken out. Finally, the two process hole pipe fittings are plugged and a blind plate is installed, and the construction is completed.

Claims

1. Oil and gas pipeline pressure opening plugging device, which is characterized by The invention comprises a plugger A, a splint valve A, a process hole pipe fitting, an oil cylinder, a splint valve A, an oil pumping pipe fitting, a flange, a splint valve B, a plugger B and a mechanical intelligent plugging device. The flange, the splint valve B and the plugger B are welded at the cut-off position of the defective pipe section. The piston rod of the oil cylinder is connected to the mechanical intelligent plugging device. The main shaft of the plugger A is movably connected to the main shaft of the speed reduction mechanism of the mechanical intelligent plugging device. The anchoring and plugging operation of the mechanical intelligent plugging device is completed by rotating the main shaft of the plugger A. The mechanical intelligent plugging device comprises an anchor The anchored sealing unit and the cleaning unit are connected by a universal joint. The anchored sealing unit includes two front and rear rolling wheel mechanisms, a sealing mechanism, an anchoring mechanism and a reducer. The anchoring mechanism is composed of a plurality of anchoring slips, and the anchoring slips are evenly distributed around the central axis of the anchored sealing unit. The sealing mechanism is composed of a clamping plate, a rubber cup, a movable cone, a T-shaped slider, a fixed plate and a screw. The front and rear ends of the cleaning unit are respectively provided with a cup assembly and an anti-collision head, and a positioning and tracking device is installed inside the cleaning unit.

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