QatarRoad Crossing Al Wakrah
July - November 2018
In 2018, Terratest Qatar LLC performed the micro-tunnelling works for the project EPIC for gas supply to Facility-D at Al Wakrah (Phase-2) to develop natural gas.
The project comprises a natural gas offshore production system with conventional wellhead platforms, interfiled pipelines, and new 36 inch buried and bunded pipeline, approximately 31 km long.
AVN 1,200 was deployed to cover project pipeline diameter. Micro-tunnelling works consist of two drive Ø 1,200 mm ID reinforced concrete sleeve pipes were jacked and then 36'' carbon steel carrier pipes were installed inside by attaching some rolling spider collars and pulling them inside and throughout the already drilled RC pipeline.
Procedure is considered successful once the pipe is already installed and confirmed by pressure test that the line sealed as per technical specifications.
Ground mainly consisted of moderately weak to moderately strong Simsima Limestone layers presenting some cavities created by Sabhka formation which present some challenge at the end of the drive however, works were successfully performed according to the standard.