Inspection of short field lines

Pipeline Description:

Field lines connecting well heads and gathering stations within a salt cavern storage facility in Northern Germany. Each wellhead is connected by two pipelines, one to supply solvent water (sea water) and one to dispose of brine. All lines are 10” WT 8.0mm, have 1.5D bends and laid underground. The typical length is between 100m and 400m. The project included a total of 12 pipelines. 

Why is it challenging?

There are no permanent pig traps available. Due to the short length of the lines, a conventional MFL inspection was extremely expensive. From an operational standpoint it was not possible to inspect all lines during one mobilization. For each well head with two similar lines, one mobilization was required. Of particular importance was completing cleaning and inspection in the shortest possible time. 

Target of the inspection:

To perform cleaning runs and execute an MFL inspections at minimum downtime, with an acceptable downtime of 24h for two pipelines.