Operator : NAM Holland

Problem

Due to reducing gas production on the Ameland West Gat offshore facility the existing Compressor was being maintained within its operating envelope by employing a constant recycle. An increase in production was not possible without a 2nd compressor cum rewheel or the installation of Ejector technology.

Solution

A patented Transvac Universal Design Ejector was installed in the recycle line of the existing Compressor to lower the Manifold pressure of the wells and thereby boost production.

• Manifold pressure initially reduced by 20% leading to an increase in gas production of ~15%. (Production increase depends on well performance)
  
  
• The End of Field Life test (lower production and bigger Ejector internals) indicated a manifold pressure of 5 barg, lower than could be achieved by 2nd stage compression. i.e. More motive gas to drive Ejector = lower suction pressure.
  
  
• €10 min. capital saving against 2nd stage compression option
  
  
• Project acceleration of one year against 2nd stage compression option
  
  
• Ejector has no running costs as it utilises motive gas energy normally wasted across the Compressor recycle valve
  
  
• Ejector internals can be replaced easily to maximise production as well pressures decline
  
  
• Ejector requires no maintenance
  
  
• Ejector produces no emissions to atmosphere