Subsea Intervention & Survey

Vietnamese survey company, Thien Nam Positioning JSC, has recently invested in its first Ranger 2 USBL acoustic positioning system from Sonardyne International Ltd., purchased through the company's regional office in Singapore. Ranger 2 will be used to track a Remotely Operated Vehicle (ROV) during the installation of a pipe flowline and a gas export pipeline protection mattress in an oilfield offshore Vietnam.

Ranger 2 is being used to track Thien Nam Positioning JSC's ROV as it undertakes subsea structure installation operations.

Ranger 2 is a high performance acoustic position reference system designed for tracking underwater targets and positioning dynamically positioned (DP) vessels. The system uses the Ultra-Short BaseLine (USBL) method to calculate the position of a subsea target, in this case Thien Nam's ROV, by measuring the range and bearing from a vessel-mounted transceiver to an acoustic transponder mounted on the target. Multiple subsea targets over a wide area and range of water depths can be simultaneously and precisely positioned.

Subsea structure installation requires accurate and precise positioning. Sonardyne Wideband 2 at the core of 6G technology uses ultra-wide bandwidth signals for more precise ranging, providing the necessary accuracy and precision for these projects. For this operation, transponders will be mounted on the mattress so that Ranger 2 can track it as it descends, ensuring that it is laid within permitted ranges for protecting the pipeline.

"This investment provides us with a reliable, highly accurate and advanced positioning system that will meet our client's expectations," said Mr Dinh Vu Bah, Managing Director of Thien Nam Positioning JSC. "After this installation, we are also preparing for future projects where the positioning accuracy of Ranger 2 will be vital."

Daniel Tan, Regional Sales Manager for Sonardyne Asia commented, "Thien Nam works with many of the oil and gas majors in the region and is constantly working to promote its service quality and reputation worldwide. Investing in Sonardyne 6G technology means that it is dedicated to providing its customers with the best available equipment to support their operations."