Vacuum-assisted grouting system with multiple grouting ports for abandoned pipelines

Abstract

The invention discloses a multi-inlet vacuum-assisted grouting system for discarded pipes, comprising a grouting tube, M grout inlets, a grout pump, an evacuating tube, N evacuating holes, and an evacuating pump. The front end of the grouting tube is connected with one end of a discarded pipe. The grout inlets are arranged in the rear end and / or sidewall of the grouting tube. The grout pump is connected with the grout inlets and is used for injecting grout into the grouting tube through the grout inlets and injecting the grout into the discarded pipe through the grouting tube. The front end of the evacuating tube is connected with the other end of the discarded pipe. The evacuating holes are provided in the rear end and / or sidewall of the evacuating tube. The evacuating tube is connected with the evacuating holes and is used for helping pump the grout from the grouting tube into the discarded pipe. The system has the advantages that grouting speed is higher, grouting power is higher, hierarchical bleeding of cement mortar is eliminated, grouting range is widened, grouting compactness and strength is improved, the potential hazard of later environmental disruption is eliminated.

Description

technical field [0001] The invention relates to the technical field of oil and gas storage and transportation, in particular to a vacuum-assisted grouting system with multiple grouting ports for abandoned pipelines. Background technique [0002] Abandonment of oil and gas pipelines is an important link in the life cycle management of pipelines. When the service life of pipelines reaches the upper limit or the benefits of continuing to transport oil and gas are far lower than the transportation costs and the pipelines have no other potential uses, abandonment is an inevitable choice. Pipeline grouting is one of the important technologies for waste disposal, and it is generally used to reinforce abandoned pipelines in sections crossing roads, railways and water bodies. [0003] However, the inventors of the present application have found that the above-mentioned technology has at least the following technical problems: [0004] Due to the long distance and large pipe diameter...

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present application provides a vacuum-assisted grouting system with multiple grouting ports for waste pipelines, which solves the grouting system in the prior art. The existing grouting process is slow, the grouting power is insufficient, and cement mortar separation analysis is prone to occur. Water, the filling distance is limited, the filling degree is not enough, the strength cannot meet the filling requirements, and there are certain risks to the later environment, etc.

Images