Small diameter metal pipe long-range lining glass reinforced plastic hose repairing method

Abstract

The invention discloses a method for repairing metal pipeline with small aperture and long distance using soft pipe interlined with glass fiber reinforced plastic. The method comprises prefabricating soft pipe (4) interlined with glass fiber reinforced plastic composed of a soft pipe blank (1), an adhesive layer (2) and a soft rubber pipe (3), introducing the soft pipe (4) interlined with glass fiber reinforced plastic into a metal pipeline to be repaired, tightening the two ends of the soft pipe (4) interlined with glass fiber reinforced plastic, and introducing steam, the adhesive layer (2) on the soft rubber pipe (3) melts under certain temperature and pressure and penetrates into the soft pipe blank (1) to adhere with the inner wall of the metal pipeline, and the adhesive layer (2) becomes hardened with the dropping of temperature and pressure inside the pipe to form glass fiber reinforced plastic lining. The length of the prefabricated soft pipe (4) interlined with glass fiber reinforced plastic can be randomly adjusted, then the soft pipe needs no to be turned over during operation, so as to repair the pipeline with small aperture and long distance. In addition, the method has the advantages of simple process and easy operation, and is an effective method to repair the old pipeline with small aperture.

Description

Technical field: [0001] The invention belongs to a method for overhauling pipelines in ground engineering, in particular to a method for repairing small-diameter and long-distance metal pipelines by using a glass-steel-lined hose method. Background technique: [0002] At present, the repair methods of old steel pipelines in use in oilfields mainly include: interspersed with polyethylene (PE) plastic pipes, squeezed cement mortar, epoxy cement, flipped glass fiber reinforced plastics or stainless steel linings, etc. These methods are generally applicable to the repair of medium and large-diameter steel pipes above φ159mm, and the length of a repair generally does not exceed 300m. [0003] As for the small-diameter old pipelines below φ114mm, even if the most suitable flip-lined fiberglass hose method is used, the length of one repair is only 100m. There are two main reasons for the short primary lining distance of small-diameter pipes. One is that the area of ​​the channel ...

AI Technical Summary

Problems solved by technology

One is that the area of ​​the channel is small, and the overturning pressure (such as 0.2-0.5Mpa) usually used is not enough, and it cannot be overturned. If the overturning pressure is increased, it is bound to increase the tensile force of the FRP hose, that is, increase the wall thickness, so that it will Reduce the channel area of ​​the original pipeline and reduce the infusion volume

The second is to use general-purpose unsaturated polyester resin as the adhesive for glass steel pipes. Although the gel time can be controlled by adjusting the formula, it is still a problem to control the gel time to more than 5 hours, which brings great inconvenience to the repair work.

As for the methods of inserting plastic pipes and extruding cement, it is not applicable due to the bending of small-diameter pipes and the deformation of the cross-section.

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