Gas Condensate PVT

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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

  • Separator tests

  • CVD experiments

  • 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.


Weatherford Laboratories pioneered the application of pseudo-steady-state core flooding techniques and applied this to various rock types using both real and synthetic gas condensate at high pressures and temperatures.