Extended Well Testing Facilities (EWTFs) are used to get accurate and comprehensive reservoir data. Technical Details. EWTFs consist of the following:
- Inlet manifold
- Three-phase Separator
- Outlet lines for Oil, Gas and Water
- Instruments and Control System for operation and safety
Typical Design parameters:
- Crude throughput : 10000 BPD
- Water cut : 5 – 10%
- GOR : 200 – 300 Sm3 / m3
- Residence time : 1 min
- Turn down : 50 – 110% of the capacity
- Design pressure : 100 bar g
The EWTFs are supplied with choke manifold, flow measurement system and testing laboratory.
Crude Oil flow from the wells is routed to a test manifold. The test manifold outlet is routed to the test separator. The test separator is a three-phase separator. All the three separated phases leaving the test separator i.e. oil, gas and water are measured for flow, using appropriate flow meters.
Liquid flow rate is measured with either positive displacement or turbine meters. For gas flow rate, V-Cone flow meters are used. The flow meter in the oil outlet line will be combined with a capacitance probe and net-oil computer to provide measurement of net-oil and emulsion-water volumes. A separate water meter is provided in the water outlet line from the test separator.
Normal controls and instrumentation include level measurement and level control valves for oil and water cuts, gas pressure measurement and gas pressure control valve in the test separator vapor space.
High and low levels in the test separator are alarmed and safeguarding is provided against overfilling by closing a shutdown valve in the feed piping to the test separator. Overpressure protection is provided by means of a relief valve in the vapor space of the test separator.