SALINITYSCAN

Development of system for semi-continuous monitoring of salinity in well streams to remove volume measurement errors and detect water breakthrough

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 Obiettivo del progetto (Objective)

'Flow management and oil recovery rates in subsea production installations are not optimal, partly due to failure to measure parameters such as salinity in single well streams. Variations in salinity will incur offsets in oil and gas volume data from subsea multiphase flow meters (MPFMs), and may also indicate water breakthroughs, in which the wells starts to produce injected sea water. Both these effects bring about considerable losses for the operator. The number of subsea installations is steadily increasing and the problem is therefore felt in the industry. The only method today for checking salinity in individual well streams involves ROV intervention, a hugely expensive operation. The Idea is to develop a sample and analysis system for installation upstream from MPFMs on subsea manifolds. Integrated in the flow line, the system will sample the multiphase production from the well, allow the fluid to separate into its single phases by electrostatic coealescing and measure the salinity of the water fraction. By monitoring the salinity, the MPFM may be regularly calibrated and the offset is removed. Salinity measurements will also enable early detection of water breakthrough, where wells start to produce injected sea water instead of oil. The system will: - Improve accuracy of MPFMs by removing errors caused by variations in salinity - Enable early detection of water breakthrough through detection of said variation in salinity - Verify MPFM data by volume fraction estimation in sample separation tank SalinityScan will involve extensive development work in several research areas, including oil separation technology, ultrasound level gauging, control electronics, mechanical design and subsea instrumentation. A large market has been identified for the introduction of the SalinityScan system. It is anticipated that the participating SMEs will gain valuable experience and great economical benefits through the completion of this project.'

Introduzione (Teaser)

Management of below-sea oil production installations can be affected by a failure to measure salinity in well streams, resulting in losses for the operator. EU-funded engineers have therefore developed a sampling and analysis system for monitoring salinity levels.

Descrizione progetto (Article)

Multi-phase flow meters (MPFMs) are used at sea to measure the individual flow rates of oil, gas and water in the well stream. The majority of MPFMs use technology that is heavily influenced by variations in salinity. However, variations in technology can result in inaccurate flow rate data, resulting in poor well management and less-effective processing of the multi-phase flow.

With EU funding, the SALINITYSCAN project developed a system for the semi-continuous monitoring of salinity in well streams. The purpose was to remove volume measurement error and detect water breakthrough. The latter occurs when the well begins to produce sea water that was previously injected into the well to increase pressure. It can also result from water penetrating the oil-carrying layer in the reservoir.

The system is based on the development of an analysis chamber equipped with level measurement and salinity sensors for analysing the separated multi-phase fluid. Project partners also designed an extensive control system that provides the end user with an easy way of ensuring increased flow and better exploitation of the well.

Sensors needed to have a high degree of reliability and safety as well as the ability to operate with a variety of multi-phase fluids in a harsh environment. These conditions involve extremes of pressure and temperature. Because of these demanding conditions, project partners developed and tested many different types of level measurement sensors.

SALINITYSCAN data was used to update the flow meter calibration parameters, thereby compensating for any changes caused by variations in salinity. The semi-continuous monitoring of salinity makes it easier to detect water breakthroughs. The technology can also be used as a tool for measuring salinity in order to determine the need to inject chemicals to inhibit hydrate formation.

Combining the SALINITYSCAN system with an MPFM unit will provide many benefits, including increased revenue as a result of correct data from flow meters. It will also help extend the life of the field through improved reservoir management. In addition, the technology will reduce the use of anti-scaling chemicals through better measurement of salinity and pH of produced water.