The application of FB light curing sleeve in the directional drilling crossing of pipelines

Pipeline backtow is the last link of directional drilling crossing. In the process of backtow, the 3PE external anticorrosive coating of pipelines is destroyed easily by the hard rocks around the guiding hole, and the pipelines can not be protected sufficiently if only the traditional PE (polyethylene) heat shrinkable sleeve is used. In this paper, a new type pipeline protection material for directional drilling crossing with better wear resistance was developed to solve this problem. FB (Fibertec) light curing sleeve, Strong Pipe wear resistant protection material for pipeline directional crossing, PP-KJ light curing sleeve and traditional PE heat shrinkable sleeve were, for the first time introduced in the Fujiang River directional drilling crossing engineering in the second phase of North Outer Ring Project of Sichuan-Chongqing Pipeline Network for trial tow test. It is shown that FB light curing sleeve is the best in terms of wear resistance and shearing resistance, so it is geologically applicable to Sichuan-Chongqing area and can protect the 3PE coating better, but it is weakly bonded to the 3PE coating. Therefore, it is necessary to choose reasonable installation mode based on engineering cost. This trial tow test verifies the performance of the installation scheme for protection material and fills in gaps in the installation and application and the effect inspection of the materials in Sichuan-Chongqing pipeline engineering.