STIM was used to conduct hydrate remediation and flowline decommissioning. The 20-mi (32-km) long flowline located in 4,800 ft (1,463 m) of water was believed to have multiple hydrate plugs which prevented the flushing and abandonment of the line in compliance with BSEE regulations.
Deployed from theM/V Island Venture, the system was used to conduct the remediation operations using a proprietary methodology developed in conjunctions with alliance partners, Halliburton and C-Innovations.
The method uses nitrogen generation systems at the surface and the STIM system subsea to boost fluids to surface and reduce the pressure at the hydrate, allowing for rapid disassociation. After remediating the hydrates and recovering 175 bbls of flowline content to surface, the flowline was then flushed clean and prepared for permanent abandonment.
TheOffshore Services Alliance was formed to allow Trendsetter Engineering, C-Innovations, and Halliburton to leverage the companies’ strengths and capabilities to provide integrated and value-added solutions for subsea well intervention and subsea inspection, maintenance and repair operations to offshore operators.