Self-organizing wireless network proves easy to install and highly reliable in crowded metal wellhead environment of onshore oil field.
AUSTIN, TEXAS (October 20, 2008) – Emerson Process Management has successfully applied its Smart Wireless self-organizing field network to monitor wellhead annular pressure at BP's Wytch Farm onshore oilfield. Wytch Farm is Western Europe's largest onshore oilfield, comprising three separate oil reservoirs that lie under Poole Harbour and Poole Bay in Dorset, UK.
Emerson's Smart Wireless transmitters enable continuous monitoring of the wellhead pressure that indicates the condition of the well. Previously the pressure was measured by using gauges that were manually read once or twice a day. Continuous monitoring eliminates the need for daily visits to the wellhead and enables unusual readings to be identified earlier and action taken to investigate and rectify faults before they develop into serious problems.
As part of a drive to improve operations, BP wanted to increase the available information, improve worker efficiency, and remove the need for operator rounds. "Manual reading of pressure gauges on the wellhead was identified as one area we could improve," explained Chris Geen, BP Manager, "but we found that wired transmitters were simply too expensive due to the wiring infrastructure needed, so wireless is the perfect technology for this application."
The Smart Wireless network installed on one of the wellsites at Wytch Farm includes 40 wireless Rosemount® pressure transmitters. Two transmitters are mounted on each wellhead and a single Smart Wireless gateway, mounted outside the process area, connects the transmitters to the control system. Data is collated in a PI historian database with the information used for regular maintenance and safety reports.
Installation was quick and easy: the manifold was isolated; the old dial gauge removed, and the wireless transmitter screwed into the existing connector. Despite short access periods to the site, it took less than eight hours in total (spread over two days) to complete including removal of all the old gauges, replacing them with the Rosemount wireless transmitters and performing a three-point manual calibration check on every device. All devices were on-line within 30 minutes.
The wellhead area was fairly open on one side but had cable trays, dense pipe work, and other metal obstructions on the other side, shielding some of the transmitters from the gateway location. Despite this challenging environment, as each transmitter was powered up, the devices found the gateway and the mesh was established. As new devices were added, they quickly and easily joined the self-organizing network. Signal strength and consistency during the operational period has been excellent.
"Wytch Farm has been a critical pilot project for BP to see if self-organizing wireless mesh technology would be suitable for other similar projects. Following the success of this installation, BP is planning to install Emerson Smart Wireless transmitters in similar applications on offshore platforms," said Geen.
With Emerson's self-organizing technology each wireless device can act as a router for other nearby devices, passing messages along until they reach their destination. If there is an obstruction, transmissions are simply re-routed along the network until a clear path to the Smart Wireless Gateway is found. As conditions change or new obstacles are encountered in a plant, such as temporary scaffolding, new equipment, or a parked construction trailer, these wireless networks simply reorganize and find a way to get their signals through.
All of this happens automatically, without any involvement by the user, providing redundant communication paths and better reliability than direct, line-of-sight communications between individual devices and a receiver. This self-organizing technology optimizes data reliability while minimizing power consumption. It also reduces the effort and infrastructure necessary to set up a successful wireless network.
Smart Wireless products and technology are an extension of Emerson's PlantWeb® digital plant architecture. For more information on Smart Wireless, go to EmersonProcess.com/smartwireless.