Gas Condensate PVT
Prediction of gas condensate well productivity requires an understanding of complex phenomena that occur in the near-well region.
Constant mass expansion and constant volume depletion (CVD) studies are performed on gas condensate reservoir fluid at reservoir temperature to simulate pressure depletion of the reservoir. A high-pressure, visual PVT cell is utilized for this test (15,000 psi and 180°C).
Constant mass expansion of reservoir fluid at reservoir (isothermal) temperature is conducted to measure accurate saturation pressure (dew point) and full P-V relationship with single phase density and viscosity.
CVD experiments are performed to simulate reservoir depletion performance and compositional variation through the well's life cycle.
Near critical: volatile oil and gas condensate studies are performed using high- pressure/high-temperature windowed cell.
Weatherford Laboratories fluid analysis techniques on near-critical, volatile oil include:
Detailed compositional analysis of reservoir fluid
Constant composition expansion (CCE) with liquid volumes
Differential liberation (DL) with:
Densities and formation volume factors at each stage of depletion
Oil properties and gas-phase properties at each stage of depletion
Measurement of oil and gas-phase properties
Equation of state modeling
Crude Oil Composition to C36+
Crude Oil Composition to C90+
Extended Gas Analysis to C12+
All Weatherford Laboratories PVT equipment is industry standard equipment, with suitable gas chromatographs (GC) that are linked to a computer data logging and integration system for compositional analysis. All laboratory measurement equipment is calibrated on a regular basis per our internal calibration procedures.