Oil-gas pipeline pit defect repairing method

Abstract

The invention provides an oil-gas pipeline pit defect repairing method. The oil-gas pipeline pit defect repairing method has the advantages of being reasonable in design, easy in operation, free of fire, low in cost and good in repairing effect. The method comprises the following steps that 1, the outer surface of a pipeline pit is pretreated, an anti-corrosion layer is removed, and cleaning and drying are carried out; 2, the pipeline pit is coated with polyurethane, and repairing is carried out until the surface of the defect part is flat; 3, aramid fiber cloth is wound around the pipeline pit filled with the polyurethane; 4, a plurality of layers of carbon fiber cloth is wound around the surface of the aramid fiber cloth layer by layer in a staggered mode; and 5, after the carbon fiber cloth on the outermost layer is bonded, the surface of the pipeline is ground and cleaned for anti-corrosion treatment to complete pipeline pit defect repairing. According to the method for repairing the defect of the pipeline pit by filling and winding the pipeline with various composite materials, theoretical guidance is provided for concave repairing design of an oil-gas pipeline, and the methodhas important significance in optimizing the pipeline repairing method, repairing the defect of the oil-gas pipeline and improving the operation safety of the pipeline.

Description

technical field [0001] The invention relates to the repair of oil and gas pipelines, in particular to a method for repairing pit defects of oil and gas pipelines. Background technique [0002] At present, pipeline transportation has become one of the important ways to transport oil and natural gas in my country. At present, the total mileage of oil and gas pipelines in my country has exceeded 120,000 kilometers. By 2025, the national oil and gas pipeline network will reach 240,000 kilometers. Oil and gas pipelines have occupied a very important position in the development of the national economy. Some of the pipelines in service have been in service for more than 10 years, which has reached 1 / 3 to 1 / 2 of the design life of the pipeline. Due to reasons such as service environment, geological conditions, stray currents, construction defects, and third-party man-made damage, a large number of pipelines have defects of varying degrees and types, which pose a serious threat to t...

AI Technical Summary

Problems solved by technology

B-type sleeves can repair circumferential defects, but the installation is relatively complicated and hot work is required, and the repair method of B-type sleeves is also relatively cumbersome. After repairing, the pipe section is relatively thick and heavy, and the repair price is relatively high

[0009] The two existing repair methods are relatively cumbersome and require hot work. After the repair, the pipe section is relatively thick and heavy, and the repair price is relatively high

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