Device and method for rapid plugging of oil and gas pipelines

Abstract

The invention provides a quick leakage stopping device and method for an oil and gas pipeline. The device comprises an inner steel cover and an outer steel sleeve which are integrally connected through bolts and embedded with rubber sealing rings; an outer chamber is formed in an opening of the inner steel cover; a drainage valve is connected with a drainage opening in the top of the inner steel cover; a drainage hole and a valve handle hole are formed in a circular cylinder on the inner steel cover; an aluminum sealing ring is arranged between the inner steel cover and the outer steel sleeve; a saddle-shaped loop opening is formed in the lower end of the outer steel sleeve; another chamfer is formed in the side edge of the saddle-shaped loop opening in the lower end of the outer steel sleeve; a closing cap is connected to the upper end of the outer steel sleeve. The quick leakage stopping device has the advantages that another compressing adapters are easily connected, the drainage is convenient, and the size is relatively small; after the saddle-shaped loop opening in the inner steel cover tightly covers a leakage point of the oil and gas pipeline, an erosion resistant coating, oil and rust in a ring-shaped outer chamfer can be removed, a sealant can be directly filled, and thus the reliability of gum sealing can be ensured; the inner steel cover covers the leakage point of the oil and gas pipeline and then an outer steel cover can be fixed to the inner steel cover, and thus the gum sealing can be carried out conveniently; the aluminum sealing ring is easily arranged between the inner steel cover and the outer steel cover; the quick leakage stopping device is simple in structure and reliable in sealing.

Description

technical field [0001] The invention relates to an auxiliary tool for maintenance of an oil and gas pipeline and a maintenance method for an oil and gas pipeline, in particular to a plugging device and a plugging method for fast and pressurized local leakage points on the oil and gas pipeline. Background technique [0002] Oil and gas pipelines are used to transport oil and natural gas over long distances. Most of the oil and gas pipelines are buried underground, and some are on the ground. Oil and natural gas in oil and gas pipelines are transported under high transmission pressure. During the long-term operation of oil and gas pipelines, local leakage points such as cracks and holes often occur due to mechanical or chemical corrosion. Leakage and outflow are not only a waste of resources but also cause safety accidents, which need to be blocked in time. Because the pressure in the oil and gas pipeline is very high, and the effluent is flammable liquid or gas, it is very...

AI Technical Summary

Problems solved by technology

[0006] 1. The inner steel cover is a steel cover with a closed upper end, which is inconvenient to connect various force-applying devices;

[0007] 2. The drainage port is on the side of the inner steel cover. When using it, a side drainage valve needs to be installed on site, which is inconvenient for the drainage operation and also makes the final welded closing cap bulky;

[0008] 3. The chamfer of the edge of the saddle-shaped ring at the lower end of the inner steel cover is an inner chamfer. After the saddle-shaped ring of the inner steel cover is tightly covered on the leakage point of the oil and gas pipeline, the inside of the ring-shaped inner chamfer cannot be cleaned. The anti-corrosion layer, oil and rust, when injecting sealant from the radial glue injection hole of the inner steel cover to the inner chamfer of the edge of the saddle ring cover at the lower end of the inner steel cover and the gap between the sealing ring for sealing operations, it cannot be guaranteed A continuous sealing rubber ring is formed, making the rubber seal between the inner steel cover and the oil and gas pipeline unreliable;

[0009] 4. The inner steel cover and the outer steel cover are two separate parts. After the inner steel cover is covered on the leakage point of the oil and gas pipeline, the outer steel cover on the inner steel cover has no fixed position, which is not convenient for the inner steel cover. Glue sealing operation with oil and gas pipelines;

[0010] 5. After the sealant is injected into the gap between the inner wall of the outer steel sleeve and the outer wall of the inner steel cover from the radial glue injection hole of the outer steel sleeve, the sealant cannot be squeezed, so that the sealant between the outer steel sleeve and the inner steel cover The ring is not dense and the rubber seal is not reliable;

[0011] 6. There are three rubber sealing rings between the inner steel cover and the outer steel cover. The structure is complex and cannot withstand high temperature. The sealing of the rubber sealing ring is extremely unreliable during welding.

[0012] The above deficiencies lead to troublesome operation, poor safety, and low operating efficiency when the local leakage point of the oil and gas pipeline is quickly sealed under pressure.

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