Posted on 28.04.2011 - 12:00 UTC in SURVEY NEWS by Rons_ROV_Links
Survey teams from SapuraAcergy and TL Geohydrographics, recently found themselves with time on their hands when the Sonardyne Fusion 6G LBL (Long BaseLine) positioning system they were using on the Reindeer Gas Field off North-West Australia, delivered surprising results
The surveyors had budgeted for several hours of work to conduct a spool piece metrology campaign in a difficult acoustic environment on the site, which is part of the Devil Creek Development Project. Baseline observations were needed from seven Compatt 6 transponders that had been deployed around the site. Two of these were close to the Reindeer jacket, significantly raising the likelihood of multipath acoustic interference during the data collection process. The teams had consequently allowed themselves the time they thought they would need to overcome these difficulties.
However, their experience of using Sonardyne 6G (sixth generation) technology was so problem-free that they had finished collecting and processing the required data for the metrology calculations within 30 minutes; around half the time it normally takes. Finding themselves with time to spare, they completed another metrology session, again in 30 minutes, as a confidence check and to provide themselves with some redundant data.
Commenting on the success of the campaign, senior project engineer for SapuraAcergy, Jeremy Cohen said: "The performance of the 6G LBL equipment was excellent. A total of 630 baselines were observed and adjusted within the seven Compatt array in less than 1 hour. Considering the difficult acoustic environment due to other subsea operations nearby and transponders being attached just 1 metre from the Reindeer jacket legs, it was very impressive. 6G was noticeably better than on past projects in similar conditions with previous generation hardware."
Sonardyne 6G products utilise ultra-wide bandwidth, digital only acoustic signals that now make it possible to obtain significantly improved ranging and telemetry performance. As the SapuraAcergy and TL Geohydrographics survey teams discovered, this makes Sonardyne's positioning systems faster, easier to set up and operate and more robust, even in the most challenging subsea operating environments. These features inevitably improve the efficiency of field development projects, reduce vessel time and generate cost savings for owners.
Sonardyne's headquarters are in Yateley, southern England. The company has regional operating subsidiaries in Aberdeen, Singapore, Houston, and Brazil and is recognised as a world leader in the design and manufacture of underwater acoustic positioning, inertial navigation, subsea communications and sonar technology systems for the offshore oil and gas, ocean scientific and maritime security industries.