Staying in touch
Published: 05 September, 2014
ODEE spoke with Tim Shea, senior analyst at ARC Advisory Group, about some of the key current benefits, challenges and solutions being discussed within the world of subsea wireless communications technology.
According to industry sources, investment in subsea-related oil & gas projects is expected to experience robust growth over the next three to five years. Tim Shea, Senior Analyst at ARC Advisory Group, points out that ARC hears talk of potential investment figures amounting to tens of billions of US dollars annually, representing an attractive opportunity for technology suppliers and other stakeholders.
Given the challenges involved in subsea operations and the difficulties involved in transmitting data, voice, and/or video through the water, Shea explains that Subsea Wireless Group (SWiG) members realise the need to develop interoperable standards among the four main wireless communication technologies: RF, acoustic, free-space optical communication (FSO) and hybrid (iterations of the three media). He adds, however, that each communication option has its own strengths and limitations. “The latter include effective range; data rate; bandwidth; immunity from noise, EMI or turbidity; and power requirements,” he said. “No one option addresses all the potential applications’ individual requirements.”
Acoustic comms
According to Shea, acoustic communication is relatively well-established within the subsea control field, with many suppliers offering some sort of non-interoperable acoustic wireless solution for ROV/AUV-related operations, monitoring, asset positioning, etc. He added that acoustic is often considered a back-up technology for communication and control of blowout preventers (BOPs) and other similar devices and can also be used for low-data rate telemetry. “The effective range of acoustic communications is typically between 10 and 30 kilometres at 1 KHz, but some meeting participants cited examples of longer ranges when operating at lower frequencies,” explained Shea. “There is a trade-off in terms of effective range and frequency, which limits acoustic’s operational envelope. RF is effective at much shorter ranges and, within the effective communication range, offers much higher data rates than acoustic communications. SWiG plans to use the Wireless HART and IEEE 802.15.4 standards as a foundation and modify as needed to meet the specific requirements of subsea applications. However, much like each of the communications options, RF has its own trade-offs in terms of effective data range, interference issues, latency, and determinism. FSO offers the highest bandwidth and is immune to EMI, acoustic background noise, and background sunlight issues. However, its trade-offs relate to interference from turbidity, limitations due to beam scattering and beam absorption, and the requirement for more accurate alignment of sender and receiver.”
Real benefits in subsea wireless comms
According to Shea, eliminating or reducing the need to deploy long-distance ‘ocean-bottom cable systems’ and/or copper and fibre-optics systems for subsea communications (with their high acquisition, installation, and maintenance costs) could provide significant savings for owner-operators of offshore E&P assets; likely in the tens or hundreds of millions of dollars on a worldwide basis. He adds that wireless communications would also enable subsea assets to be deployed faster and more efficiently.
Shea considers that fibre-optic, long-distance copper-based, and ocean-bottom cable systems each possess their own technical limitations ranging from the need to for specialised wet-mate fibre-optic connectors and repeaters, plus noise interference, and higher power consumption. Additionally, Shea believes wired subsea communications approaches also typically involve greater total cost of ownership (TCO) than with wireless deployments.
Key subsea applications
Assuming that the technology matures, performance improves and standards such as SWiGradio emerge to enable interoperability and improve cost-effectiveness, Shea’s view is that the deployment of wireless subsea communications should increase in a number of applications. “These include collecting data from subsea assets from an ROV/AUV and then transmitting those data to a topside or land-based system and transmitting live video of ROV/AUV operations,” he said.
Other applications mentioned at a recent SWiG meeting included wireless monitoring of subsea production trees; ‘non-critical’ control systems; wireless pipeline inspection and monitoring; communications of data, video and voice; asset positioning; installing unplanned sensor networks; fixed structure and non-fixed structure and equipment asset integrity management; decommissioning, riser and/or mooring monitoring; ‘black box’ recording and low marine rise package (LMRP) to BOP connector; among others.
According to Shea, additional applications that could be served through FSO communications include 2D and 3D mapping, laser imaging, laser illuminators and laser ranging. SWiG meeting participants all agreed that the number of applications would only grow as adoption increases and users gain greater confidence in the capabilities of subsea wireless communications.
Recommendations
Major E&P operators, such as Chevron, BP, Statoil, and ConocoPhillips; and oilfield service companies, such as One Subsea (Cameron and Schlumberger JV) are active participants in SWiG membership. “To the best of our knowledge, Yokogawa and GE are the only automation suppliers playing an active role at this point in time,” said Shea. “These leading companies clearly recognise the value that developing interoperable subsea wireless communications standards can provide to owner-operators they strive to meet today’s significant oil & gas industry challenges.”
ARC recommends that any E&P company active in subsea operations, including tie-backs to offshore platforms, should learn more about the SWiG radio standard. Non-member end user companies can ask to be invited as a one-time guest at one of SWiG’s quarterly meetings. Oilfield service suppliers, automation suppliers and wireless communications suppliers (RF, acoustic, and/or FSO) should consider participating in SWiG in order to learn more about the technical requirements involved in subsea operations, share their own expertise, network with potential customers, and help shape the future direction of the subsea wireless standards.
The Subsea Wireless Group
The Subsea Wireless Group (SWiG) holds quarterly Technical Capabilities and Standards Development meetings in key regional locations such as London, Boston and Houston, among others to help develop standards for subsea wireless communications. These include four primary technologies: radio frequency (RF), acoustic, free space optical (FSO), and hybrid (iterations of the three media). To meet the growing demand for subsea production systems, a number of industry stakeholders have taken it upon themselves to participate in SWiG to help develop and promote interoperability of subsea wireless networks to help benefit the entire subsea and offshore oil & gas community. The overall objectives of the not-for-profit SWiG are to:
• Encourage dialogue between users to achieve interoperability of through-water communications approaches.
• Raise industry awareness and acceptance of through-water communications.
• Identify and develop needed industry standards for through-water communications.
• Encourage integration of subsea communication technologies.
• Promote best practices across the industry.
• Promote knowledge transfer across the industry.
SWiG membership currently includes the following companies: BP, Chevron, Statoil, ConocoPhillips, GE Oil & Gas, Yokogawa, WFS Technologies, Kongsberg, Sonardyne, Technip, SINTEF, Subsea 7, Teledyne Marine Systems, ABS Technology, Battelle, Nautronix, JPL, MCSKenny, Octio AS, Saab, and Evologics.
ARC Advisory Group
Founded in 1986, ARC Advisory Group is a leading technology research and advisory firm for industry and infrastructure. Its coverage of technology and trends extends from business systems to product and asset lifecycle management, supply chain management, operations management, energy optimisation, industrial internet of things (IoT) and automation systems. ARC’s analysts and consultants have the industry knowledge and the first-hand experience to help clients find the best answers to the complex business issues facing organisations today. ARC sets out to help clients evaluate and select the best technology solutions to match their specific needs.
www.arcweb.com
