Most of the Gas-Oil Separation Plants (GOSP) in Southern Area Producing of Saudi Aramco will be producing between 40% and 75 % water cuts by the turn of the century. Many GOSPs will be producing more than twice the amount of water they were originally designed for. Consequently, modifications must be made to the GOSPs so that they will have the capacity to separate and clean up these large volumes of produced water.
The most attractive option is to improve the separation efficiency of the High Pressure Production Traps (HPPT) where formation water is first removed from the wellhead fluid. These traps have historically removed very little water from the wellhead fluid. However, the following modifications have proven to significantly improve the separation efficiency of the traps:
-Double the height of the weir, and raise the oil level from 40% to 65% full.
-Install a new inlet device to minimize the formation of foam.
-Install coalescing and foam-breaking internals to enhance oil/water coalescing and separation and to break the foam on top of the oil layer.
In Southern Area Producing of Saudi Aramco, wellhead fluids are gathered and processed through Gas-Oil Separation Plants (GOSP), which produce dry crude, water, gas, and condensate. As shown in Figure 1, the wellhead fluids first enter the High Pressure Production Traps (HPPT) where the gas and some of the water is separated from the crude oil. The remaining oil/water emulsion flows into the Low Pressure Production Traps (LPPT) where the oil is flashed at a lower pressure and more gas is separated. The oil/water emulsion is then pumped through the dehydrator and desalter in order to remove the remaining water and salt to meet the 0.2% BS&W and 10 PTB specifications.
The dry oil is pumped to Abqaiq Plants for sweetening and stabilization, and the gas is compressed and sent to the gas plants. The separated water is sent to the GOSP Water/Oil Separator (WOSEP) and injected back into the reservoir through disposal wells. A standard GOSP in Southern Area Producing was originally sized for 330 MBD oil and 142 MBD water, which is a 30% water cut wellhead fluid.
Number of Pages
Looking for more?
Some of the OnePetro partner societies have developed subject- specific wikis that may help.