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
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
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.