A method for sealing the leakage point between the branch port of the natural gas trunk pipeline and the root valve of the branch pipeline from the inside

Abstract

The invention relates to a method for blocking the leakage points between natural gas main pipeline branch openings and a branch line pipeline root valve from the inside. The method comprises following steps that S1, pretreatment, wherein a branch line pipeline upper root valve and a downstream stop valve closest to the branch line pipeline upper root valve are closed, a pipeline between the two valves is emptied, and the emptied pipeline is dismounted from the root valve; S2, internal grease injecting, wherein a grease injecting and discharging device is arranged on an outlet of the root valve, seal grease is injected, and the leakage points are temporarily blocked; S3, reinforcing treatment, the leakage points are cleaned and ground from the outer portion of the pipeline, leakage stop cement gum is smeared and aligned, and after the leakage stop cement gum is completely hardened, a fiber cloth is used for winding the leakage point pipeline, and bonding is carried out through epoxy impregnating resin; S4, grease discharging recovery, wherein after seal grease is discharged, the root valve is closed, the grease injecting and discharging device is dismantled, an original pipeline isreassembled, and leakage stoop is finished. The method has the beneficial effects that a main pipeline is subject to conveying belt pressure leakage stop continuously, the method is simple, a large amount of emptying is not needed, the leakage stop cost is low, the damage to the environment is small, and the leakage stop effect is good.

Description

Technical field [0001] The invention belongs to the field of natural gas long-distance pipeline leakage treatment, and in particular relates to a method for internally blocking the leakage point between the branch of a weather trunk pipeline and the root valve of the branch pipeline. Background technique [0002] Long-distance oil and gas pipelines include buried main pipelines and surface pipeline ancillary equipment. Surface pipeline ancillary equipment includes oil and gas sub-transmission stations and line cutoff valve chambers. Stations and valve chambers have bypass pipelines, valves and pressure gauges. There are various types and connection methods of ancillary equipment. Due to improper installation methods or product quality defects, oil and gas leaks are likely to occur under the condition of medium pressure fluctuations. Because the pipeline transports high-pressure oil and gas, which is a flammable and explosive medium, once it leaks, it is likely to cause major safe...

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