As an alternative/parallel to a new build (Green Field), the Compact System may be introduced on existing platforms to assist low pressure wells being part of the established manifold system.

Reopening of previously shut-in wells

 

High Pressure manifold systems

Below is an example representing a scenario of a two manifold production system (50/100 bar), where the low pressure wells (30 bar) are connected to the existing production system by using the CSU System.

Figure 1-1: Allowing previously shut in wells (30 bar) becoming part of the existing production system

 

Low Pressure manifold systems

Below is an example representing a scenario of a two manifold production system (11/52 bar), where low pressure wells (< 11 bar) are connected to the existing production system by using the CSU System.

 

Figure 1-2: Allowing previously shut in wells (< 11 bar) becoming part of the existing production system

 

 

Tail end production

For a mature field with limited gas production preventing efficient use of existing centrifugal compression system (recirculation), the CSU may act as a gas supplier for the individual compression stages, see figure 2-1.

 

Figure 2-1: Compressed gas for stabilisation of individual compressor train

 

 

Gas lift

The CSU system may be used as a combined gas compression and gas lift / – injection system

Figure 3-1: Gas compression and gas lift / – injection system, version 1

 

Figure 3-2: Gas compression and gas lift / – injection system, version 2

 

Desert oil and gas production

The CSU system used for gas lift of single wells connected to a common 3 phase pipeline to refineries.

Figure 4-1: Gas lift of single wells

 

Transport solutions

 

Conclusion on brownfield opportunities

As can be seen from examples above, it is possible to design tailor-made CSU systems for almost any demand of flowrate, feed pressure and exit pressure.

Installation of a CSU system may thus be an attractive alternative to redesign of existing compressor systems on production facilities both if excessive gas over one compression stage need to be handled, or if too small gas quantities over one compressor stage would cause very low efficiency.

Exit pressure from the CCVs can be any desired value to fit with an existing inter-stage pressure in the process or to fit with inlet pressure to a gas drying system.