A new generation of compact separators which can be inserted into wellstream processing pipework on production platforms has been introduced by Statoil.
Testing and qualification of an 8-inch phase splitter at K-lab.
Better and cheaper systems for primary (first-stage) separation of gas from liquids on production platforms are required for two main reasons:
- coping with late-stage (tail) production from declining fields where wellstream compositions are highly variable and often dominated by large quantities of produced water
- using older production centres to handle third-party and satellite field production.
Not surprisingly, such requirements create bottlenecks when existing and often outmoded separator systems are unable to keep pace.
Statoil has therefore developed a new generation of highly efficient, compact deliquidisers and degassers for insertion into existing process pipework. This is why they are described as “in-line”.
A deliquidiser removes liquids from gas in gas-dominated wellstreams, while a degasser separates gas from liquids in liquid-dominated wellstreams.
The basic principle involves the use of static swirl elements, which induce cyclonic flows to press liquids out towards the pipe walls while driving the gas inwards to create a gas core.
Patented by Statoil, this compact separation technology has been licensed to CDS Engineering, a Dutch company specialising in static turbines and swirl elements.
Having attracted considerable external interest, the intention is to commercialise the separators fully and to develop the next generation for subsea application.