Joint coating method applicable to thickened erosion-resistant layers of directionally drilled and crossed pipelines

Abstract

The invention discloses a joint coating method applicable to thickened erosion-resistant layers of directionally drilled and crossed pipelines. The joint coating method includes reserving a pipe end with the length of 100-150mm on an erosion-resistant layer; selectively utilizing a narrow polyethylene thermal shrinkage band as a first joint coating construction layer; selectively utilizing a special directional drilling polyethylene thermal shrinkage band as a second joint coating construction layer; utilizing a special directional drilling polyethylene sacrificial band as a third joint coating construction layer in the advancing direction for dragging back a directionally drilled and crossed pipeline. The thickness of the narrow polyethylene thermal shrinkage band is 2.5mm, and the width of the narrow polyethylene thermal shrinkage band is equal to the reserved length of the pipe end after the narrow polyethylene thermal shrinkage band is shrunk. The thickness of the special directional drilling polyethylene thermal shrinkage band ranges from 2.8mm to 3.1mm before the special directional drilling polyethylene thermal shrinkage band is shrunk, and the width of the special directional drilling polyethylene thermal shrinkage band ranges from 520mm to 600mm after the special directional drilling polyethylene thermal shrinkage band is shrunk. The thickness of a single side of the special directional drilling polyethylene sacrificial band is increased and is 2.8mm, and the width of the special directional drilling polyethylene sacrificial band is 300mm after the special directional drilling polyethylene sacrificial band is shrunk. The joint coating method has the advantages that the completeness of the erosion-resistant layers of directionally drilled and crossed sections of the pipelines can be improved advantageously, and weak links of joint coated positions are protected; water vapor channels can be effectively prevented by multi-layer staggered joint structures, the service life can be prolonged, and the scratch resistance and the tensile strength can be improved.

Description

technical field [0001] The invention relates to a construction method, in particular to a new joint construction method for oil and gas pipeline engineering through directional drilling through thickened anticorrosion layers of pipelines. Background technique [0002] At present, directional drilling crossing technology has been widely used in domestic oil and gas pipeline projects, not only in river crossing sections, but also in special areas such as mountains, roads, and railway crossings. Due to geological conditions, non-standard construction measures, and lack of effective measures for the protection of pipeline anti-corrosion coatings, the damage to the anti-corrosion coating of pipelines in crossing sections has become more frequent. Different from general line pipelines, after the completion of directional drilling, the pipeline will be buried deep in the soil for a long time and cannot be excavated. The damage of the pipeline anti-corrosion layer formed during the ...

AI Technical Summary

Problems solved by technology

Due to geological conditions, non-standard construction measures, and lack of effective measures for the protection of pipeline anti-corrosion coatings, the damage to the anti-corrosion coating of pipelines in crossing sections has become more frequent

Different from general line pipelines, after the completion of directional drilling, the pipeline will be buried deep in the soil for a long time and cannot be excavated. The damage to the pipeline anti-corrosion layer formed during the construction is almost irreparable, leaving irreparable hidden dangers to the long-term safe operation of the pipeline.

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