Evaluating the Technical Challenges of River Crossing for the Bakhrabad-Siddhirganj Gas Transmission Pipeline Project

摘要

This paper presents the results of a study focused on the recently constructed 60 km X 30 inch Bakhrabad-Siddhirganj gas transmission pipeline. It was laid from Bakhrabad gas field, Comilla, to Siddhirganj power station, Narayanganj. It was commissioned by Gas Transmission Company Limited (GTCL). Despite meticulous planning, the pipeline had to cross six rivers of various depths and widths. Horizontal Directional Drilling (HDD) technology was used for all river crossing projects. This study attempted to categorize the challenges in terms of the nature of the problems and their reasons, frequency, degree of severity etc. The problems identified included the Right-of-Way (ROW), selection of crossing point, sub-soil investigation and selection of work procedure, pipe mis-alignment, delay in rig mobilization, stuck pipe, magnetic interference in pilot hole, and buoyancy control. The challenges and remedial measures of the six projects are briefly discussed in this paper.