Thursday, Dec 20, 2007
The Norwegian sensor technology company PRESENS AS has been chosen to supply specialized pressure sensors to CorrOceanMareco AS for integration with their new generation subsea chemical injection valve. By incorporating advanced pressure sensing technology into their low-flow throttle valve design, several unique operational advantages will be gained, such as extreme accuracy with no drift, improved flow control of chemical injection, ongoing monitoring of actual injection rates, and less required calibration and maintenance.
PRESENS’ pressure sensor technology was selected due largely to its proven capability of measuring high pressures with extreme accuracy and no drift. PRESENS’ sensors are designed specifically for high-accuracy pressure and temperature measurement in severe environments such as topside and subsea oil and gas applications, which proved to be an ideal match for the development of CorrOceanMareco’s new generation chemical injection valve.
”We needed a better pressure sensor solution to improve our product performance. After more than one year of testing and benchmarking, we chose PRESENS. With the combination of high accuracy, no drift and an inherent tolerance to over-pressure and pressure spikes, PRESENS pressure sensors offer a level of performance unequalled by any other pressure sensor”, states CorrOceanMareco’s Managing Director, Stig Gustafson.
Accurate chemical injection
In the new chemical injection valve, a pressure sensor is located within the valve to measure the differential pressure, i.e. the liquid flow, across the valve. Throughout the injection cycle, pressure data is recorded and sent to the controller, which monitors and controls the chemical dosage rates. Precise flow control is based on high accuracy, and for this application there is no other sensor that can match the accuracy of the PRESENS sensor.
Inferior flow conditions in subsea pipelines can result in inefficient production, which can be very expensive to the operator. To avoid undesirable flow conditions in the pipeline, subsea operators inject different kind of chemicals. Accurate, monitored chemical injection eliminates the need for over-injection, greatly reducing chemical consumption, chemical costs and potential risk to the environment.
Less calibration and maintenance
PRESENS’ pressure sensors are based on Silicon Micro Electro Mechanical System (MEMS) technology. The company’s proprietary patented technology has a number of advantages over other current solutions on the market.
· Silicon (Si) single crystal structure minimizes errors due to thermal and mechanical hysteresis and prevents long-term drift due to “creep”
· A tubular design enables mechanical de-coupling of sensing area and eliminates error due to mounting stress
· Extreme tolerance to over-pressure and pressure spikes is achieved in compressive stress operations
· The piezoresistive Wheatstone resistor bridge is extremely stable and measures pressure and temperature simultaneously on the same resistor bridge
The combination of these attributes results in reduced calibration and maintenance of the injection valve, causing fewer potential disruptions or shutdowns in production. The pressure sensor within the chemical injection valve may also serve as a back-up for wellhead pressure/temperature sensors measuring the process pressure.
A win-win relationship
“We always strive to further develop and improve our products and services”, says Gustafson. “By entering into an agreement with PRESENS we did not only got the best sensor available on the market, we also got a trustworthy and capable partner with whom we want to continue working with”.
Stefan Werner, PRESENS’ Director of Sales, agrees with Gustafson. ”We find synergies in cooperating with CorrOceanMareco. Our companies are similar to each other in many ways, and have common interest in continuously seeking and developing new and better technology for the oil and gas industry. Therefore we look forward to continuing our collaboration with CorrOceanMareco in the future.”
Success in the field
One of the first deliveries of CorrOceanMareco’s new throttle valves with the integrated PRESENS pressure sensor was to Statoil’s Tyrihans oilfield in the Norwegian Sea. The positive results from that installation, including high reliability and cost-effectiveness, resulted in Statoil recently awarding a new contract to CorrOceanMareco for their Gjøa project.
About PRESENS AS
Presens was founded in 1996 to commercialize a patented pressure sensor technology developed by the Sintef Group, one of Europe’s largest independent research organizations and among the world’s leading research institutes in silicon micromachining technology. The company’s unique and versatile technology enables extremely accurate measurements of pressures under demanding conditions.
Presens secured its first commercial installation in 1998, and has since further developed its technology with a range of products designed for a number of challenging applications. Today, Presens supplies high-accuracy sensors throughout the world in the oil & gas, aerospace and industrial markets. More information is available at www.presens.com.