The latest breakthrough in multibeam technology, Tritech's Gemini 720i imaging sonar is proving its worth within the harsh environment of the Southern North Sea (SNS).
Marine Subsea (UK) Ltd, (formally TS Marine) recently underwent an abandonment campaign in SNS locations where the shallow water depth, low visibility and strong currents provided a challenging environment for this type of work.
Gemini 720i's fast update rate and high resolution imaging contributed to Marine Services' reduced operations time, during Phase 1 of the campaign.
Gemini 720i's real-time imaging provided an excellent viewing platform to assist with the deployment of the Baker Hughes Well Head Abandonment Straddle Packer tool and the subsequent plugging of the well, to comply with Oil & Gas UK guidelines.
Gemini 720i was deployed on a Perry Slingsby XLS 150hp workclass ROV, supplied by underwater vehicle contractor; Specialist Subsea Services, (formally Oceanteam Subsea Services). The sonar's integrated sound velocity sensor and high resolution imaging provided the sharpest image with accurate ranging. This gave the ROVs pilot a higher level of awareness in poor flying conditions. Gemini 720i's wide 120° field of view allowed the ROV pilots to fly the vehicle into confined spaces with greater confidence.
Grant Cowie, Subsea Team Leader, Marine Subsea (UK LTD) commented:
"Gemini 720i has a greater and improved acoustic range and resolution capability compared to other multibeam sonars in the same class. Gemini's real-time capabilities allowed us to dramatically reduce operations time during phase one of our abandonment campaign in SNS."
Dave McKay, Divisional Director – ROV, Specialist Subsea Services also commented:
"As an ROV contractor, we look to enhance our vehicles with the most efficient underwater tools, including sonar technology. Our pilots were extremely impressed with the operation of the Gemini 720i sonar and were able to maintain a high quality service efficiency for our clients in near zero visibility conditions".