A Gulf of Mexico upstream operator required pipeline abandonment solutions for one 6 inch pipeline. The operator’s permitted Department of Interior (DOI) decommissioning obligation required a seawater flush volume equal to 110% of the internal pipeline capacity.
Pipeline: 6” x 24.75 miles
- Comply with the federal pipeline hydrocarbon free protocols.
- Reroute all liquids onto the adjacent receiving platform and account for all liquids by means of a temporary LACT unit.
- Achieve a successful static sheen test on the customers pipeline system post flushing procedure.
- Provide an alternative solution that would mitigate the risk of mechanical pig failure, but also maintain a clear interface between the pipeline fluids.
Engineer a multiphase procedure to achieve both an accurate measurement and delivery of the operator’s liquid product downstream, and a complaint pipeline system permitted for abandonment.
Technical Achievements & Benefits
- LiquiGel® Pig Technology insured a clean interface between the pipeline fluids in order to keep oil below 3% BS&W.
- DynoWash® De-Oiling solvent encapsulated and assisted in the removal of hydrocarbons out of the pipeline system.
- Identical tie-in points for the LiquiGel® Pig Technology and the seawater displacement.
- No pig launchers/receivers required.
- Mitigated concerns of pipeline internal integrity or mechanical pig failure.
- LiquiGel® Pig Technology and pipeline cleaning system minimized project extensions compared to routine flushing procedures requiring a successful static sheen requirement.
- The LiquiGel® Pig system traveled a total 49 miles without composition degradation.